Heritage Financial (HFWA) 10-K 11 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 25, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	HERITAGE FINANCIAL CORP /WA/
Entity Central Index Key	1046025
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$473,242,340
Entity Common Stock, Shares Outstanding		30,257,691

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Financial Condition (USD $)	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash on hand and in banks	$74,028,000	$40,162,000
Interest earning deposits	47,608,000	90,238,000
Cash and cash equivalents	121,636,000	130,400,000
Other interest earning deposits	10,126,000	15,662,000
Investment securities available for sale, at fair value	742,846,000	163,134,000
Investment securities held to maturity (fair value of $36,874 and $36,340, respectively)	35,814,000	36,154,000
Loans held for sale	5,582,000	0
Allowance for loan losses on noncovered loans	-27,729,000	-28,824,000
Total loans receivable, net	2,223,348,000	1,203,096,000
FDIC indemnification asset	1,116,000	4,382,000
Other real estate owned ($1,177 and $182 covered by FDIC shared-loss agreements, respectively)	3,355,000	4,559,000
Premises and equipment, net	64,938,000	34,348,000
Federal Home Loan Bank stock, at cost	12,188,000	5,741,000
Bank owned life insurance	35,176,000	2,193,000
Accrued interest receivable	9,836,000	5,462,000
Prepaid expenses and other assets	61,871,000	22,927,000
Other intangible assets, net	10,889,000	1,615,000
Goodwill	119,029,000	29,365,000
Total assets	3,457,750,000	1,659,038,000
LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits	2,906,331,000	1,399,189,000
Junior subordinated debentures	19,082,000	0
Securities sold under agreement to repurchase	32,181,000	29,420,000
Accrued expenses and other liabilities	45,650,000	14,667,000
Total liabilities	3,003,244,000	1,443,276,000
Stockholders’ equity:
Preferred stock, no par value, 2,500,000 shares authorized; no shares issued and outstanding at December 31, 2014 and 2013	0	0
Common stock, no par value, 50,000,000 shares authorized; 30,259,838 and 16,210,747 shares issued and outstanding at December 31, 2014 and 2013, respectively	364,741,000	138,659,000
Retained earnings	86,387,000	78,265,000
Accumulated other comprehensive income (loss), net	3,378,000	-1,162,000
Total stockholders’ equity	454,506,000	215,762,000
Total liabilities and stockholders’ equity	3,457,750,000	1,659,038,000
Noncovered Loans
ASSETS
Noncovered loans receivable, net	2,124,877,000	1,168,166,000
Allowance for loan losses on noncovered loans	-22,153,000	-22,657,000
Noncovered loans receivable, net of allowance for loan losses	2,102,724,000	1,145,509,000
Covered Loans
ASSETS
Covered loans receivable, net	126,200,000	63,754,000
Allowance for loan losses on covered loans	-5,576,000	-6,167,000
Covered loans receivable, net of allowance for loan losses	$120,624,000	$57,587,000

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Investment securities held to maturity	$36,874	$36,340
Other real estate owned, covered by FDIC loss share	$1,177	$182
Preferred stock, par value (in usd per share)	$0	$0
Preferred stock, shares authorized	2,500,000	2,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in usd per share)	$0	$0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,259,838	16,210,747
Common stock, shares outstanding	30,259,838	16,210,747

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME:
Interest and fees on loans	$110,437	$67,630	$65,588
Taxable interest on investment securities	7,328	1,918	2,195
Nontaxable interest on investment securities	2,886	1,539	1,097
Interest and dividends on other interest earning assets	455	341	229
Total interest income	121,106	71,428	69,109
INTEREST EXPENSE:
Deposits	5,150	3,673	4,469
Junior subordinated debentures	458	0	0
Other borrowings	73	51	65
Total interest expense	5,681	3,724	4,534
Net interest income	115,425	67,704	64,575
Provision for loan losses	4,594	3,672	2,016
Net interest income after provision for loan losses	110,831	64,032	62,559
NONINTEREST INCOME:
Bargain purchase gain on bank acquisition	0	399	0
Service charges and other fees	11,143	5,936	5,516
Merchant Visa income, net	1,076	862	685
Change in FDIC indemnification asset	-2,543	-181	-1,033
Gain on sale of investment securities, net	287	0	0
Gain on sale of loans, net	1,518	142	295
Other income	4,986	2,493	1,809
Total noninterest income	16,467	9,651	7,272
NONINTEREST EXPENSE:
Compensation and employee benefits	52,634	31,612	29,020
Occupancy and equipment	13,406	9,724	7,365
Data processing	9,243	4,806	2,555
Marketing	2,502	1,598	1,517
Professional services	6,185	3,936	2,543
State and local taxes	1,976	1,150	1,226
Impairment loss on investment of securities, net	45	38	78
Federal deposit insurance premium	1,718	1,001	1,002
Other real estate owned, net	638	309	316
Amortization of intangible assets	1,920	543	427
Other expense	9,112	4,798	4,343
Total noninterest expense	99,379	59,515	50,392
Income before income taxes	27,919	14,168	19,439
Income tax expense	6,905	4,593	6,178
Net income	21,014	9,575	13,261
Basic earnings per common share (in usd per share)	$0.82	$0.61	$0.87
Diluted earnings per common share (in usd per share)	$0.82	$0.61	$0.87
Dividends declared per common share (in usd per share)	$0.50	$0.42	$0.80
Noncovered Loans
INTEREST EXPENSE:
Provision for loan losses	2,232	1,784	1,570
Covered Loans
INTEREST EXPENSE:
Provision for loan losses	$2,362	$1,888	$446

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$21,014	$9,575	$13,261
Change in fair value of securities available for sale, net of tax of $2,531, $(1,596) and $(34), respectively	4,676	-2,965	-63
Reclassification adjustment of net (gain) loss from sale of available for sale securities included in net income, net of tax of $(101), $0 and $0, respectively	-186	0	0
Other-than-temporary impairment on securities held to maturity, net of tax of $0, $0 and $(18), respectively	0	0	-34
Accretion of other-than-temporary impairment on securities held to maturity, net of tax of $28, $31 and $57, respectively	50	59	105
Other comprehensive income (loss)	4,540	-2,906	8
Comprehensive income	$25,554	$6,669	$13,269

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Change in fair value of securities available for sale, tax	$2,518	($1,596)	($34)
Reclassification adjustment of net (gain) loss from sale of available for sale securities included in net income, tax	-101	0	0
Other-than-temporary impairment on securities held to maturity, tax	0	0	-18
Accretion of other-than-temporary impairment on securities held to maturity, tax	$28	$31	$57

Condensed_Consolidated_Stateme5

Condensed Consolidated Statement of Stockholders' Equity (USD $)		Total	Common Stock	Unearned Compensation ESOP	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net
In Thousands, except Share data, unless otherwise specified
Beginning balance at Dec. 31, 2011		$202,520	$126,622	($94)	$74,256	$1,736
Beginning balance, shares at Dec. 31, 2011			15,456,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted and unrestricted stock awards issued, net of forfeitures, shares			86,000
Restricted and unrestricted stock awards issued, net of forfeitures		0	0
Stock option compensation expense		106	106
Exercise of stock options (including tax effect from nonqualified stock options), shares		11,365	12,000
Exercise of stock options (including excess tax benefits from nonqualified stock options)		129	129
Restricted stock compensation expense, shares			10,000
Restricted stock compensation expense		1,185	1,091	94
Excess tax benefit from restricted stock		-93	-93
Common stock repurchased and retired, shares			-446,000
Common stock repurchased		-6,023	-6,023
Net income		13,261			13,261
Other comprehensive income (loss), net of tax		8				8
Cash dividends declared on common stock		-12,155			-12,155
Common stock issued in business combination		0
Ending balance at Dec. 31, 2012		198,938	121,832		75,362	1,744
Ending balance, shares at Dec. 31, 2012			15,118,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted and unrestricted stock awards issued, net of forfeitures, shares			100,000
Restricted and unrestricted stock awards issued, net of forfeitures		0	0
Stock option compensation expense		71	71
Exercise of stock options (including tax effect from nonqualified stock options), shares		16,553	17,000
Exercise of stock options (including excess tax benefits from nonqualified stock options)		176	176
Restricted stock compensation expense		1,223	1,223
Excess tax benefit from restricted stock		-13	-13
Common stock repurchased and retired, shares			-557,000
Common stock repurchased		-8,825	-8,825
Net income		9,575			9,575
Other comprehensive income (loss), net of tax		-2,906				-2,906
Cash dividends declared on common stock		-6,672			-6,672
Common stock issued in business combination, shares			1,533,000
Common stock issued in business combination		24,195
Ending balance at Dec. 31, 2013		215,762	138,659		78,265	-1,162
Ending balance, shares at Dec. 31, 2013			16,211,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted and unrestricted stock awards issued, net of forfeitures, shares			121,000
Restricted and unrestricted stock awards issued, net of forfeitures		0	0
Stock option compensation expense		20	20
Exercise of stock options (including tax effect from nonqualified stock options), shares		84,189	84,000
Exercise of stock options (including excess tax benefits from nonqualified stock options)		921	921
Restricted stock compensation expense		1,395	1,395
Excess tax benefit from restricted stock		112	112
Common stock repurchased and retired, shares			-156,000
Common stock repurchased		-2,601	-2,601
Net income		21,014			21,014
Other comprehensive income (loss), net of tax		4,540				4,540
Cash dividends declared on common stock		-12,892			-12,892
Common stock issued in business combination, shares			14,000,000
Common stock issued in business combination	[1]	226,235
Ending balance at Dec. 31, 2014		$454,506	$364,741		$86,387	$3,378
Ending balance, shares at Dec. 31, 2014			30,260,000
[1]	The amount of common stock issued in connection with the merger is net of $489,000 of issuance costs.

Condensed_Consolidated_Stateme6

Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	0 Months Ended															3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 11, 2014	Oct. 23, 2014	Jul. 24, 2014	Mar. 27, 2014	Jan. 29, 2014	Oct. 23, 2013	Jul. 23, 2013	Apr. 24, 2013	Jan. 30, 2013	Nov. 30, 2012	Oct. 30, 2012	Jul. 25, 2012	Jun. 26, 2012	Apr. 26, 2012	Feb. 01, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Merger issuance costs																								$489	$0	$0
Cash dividends declared on common stock (in usd per share)	$0.16	$0.09	$0.09	$0.08	$0.08	$0.08	$0.18	$0.08	$0.08	$0.30	$0.08	$0.08	$0.20	$0.08	$0.06	$0.25	$0.09	$0	$0.16	$0.08	$0.18	$0.08	$0.08	$0.50	$0.42	$0.80

Condensed_Consolidated_Stateme7

Condensed Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$21,014		$9,575	$13,261
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,882		5,411	4,290
Changes in net deferred loan fees, net of amortization	-1,733		574	236
Provision for loan losses	4,594		3,672	2,016
Net change in accrued interest receivable, FDIC indemnification asset, prepaid expenses and other assets, accrued expenses and other liabilities	13,230		9,047	5,878
Restricted and unrestricted stock compensation expense	1,395		1,223	1,185
Stock option compensation expense	20		71	106
Tax benefits and excess tax benefits from restricted stock	-112		13	93
Amortization of intangible assets	1,920		543	427
Bargain purchase gain on bank acquisition	0		-399	0
Gain on sale of investment securities, net	-287		0	0
Impairment loss on investment of securities, net	45		38	78
Origination of loans held for sale	-57,656		-6,784	-21,035
Gain on sale of loans, net	-1,518		-142	-295
Proceeds from sale of loans	57,515		8,602	21,482
Earnings on bank owned life insurance	-455		-70	-80
Valuation adjustment on other real estate owned	0		371	824
Gain on other real estate owned, net	-23		-264	-587
Loss (gain) on sale or write-off of furniture, equipment and leasehold improvements	505		-584	3
Net cash provided by operating activities	51,336		30,897	27,882
Cash flows from investing activities:
Loans originated, net of principal payments	-21,651		-43,140	-2,790
Maturities of other interest earning deposits	5,475		1,987	0
Maturities of investment securities available for sale	66,876		51,443	61,751
Maturities of investment securities held to maturity	3,284		4,192	2,177
Purchase of other interest earning deposits	0		0	-2,232
Purchase of investment securities available for sale	-344,146		-43,627	-63,903
Purchase of investment securities held to maturity	-3,294		-7,414	0
Purchase of premises and equipment	-3,940		-5,205	-3,859
Proceeds from sales of other real estate owned	9,914		6,003	5,255
Proceeds from sales of investment securities available for sale	156,994		0	0
Proceeds from redemption of FHLB stock	617		208	99
Proceeds from sale of premises and equipment	1,170		700	0
Investment in new market tax credit partnership	-25,000		0	0
Net cash received from acquisitions	32,052		18,260	0
Net cash used in investing activities	-121,649		-16,593	-3,502
Cash flows from financing activities:
Net increase (decrease) in deposits	73,248		13,763	-18,073
Common stock cash dividends paid	-12,892		-6,672	-12,155
Net increase (decrease) in securities sold under agreement to repurchase	2,761		13,399	-7,070
Proceeds from exercise of stock options	921		176	129
Excess tax benefits from stock options and restricted and unrestricted stock	112		-13	-93
Repurchase of common stock	-2,601		-8,825	-6,023
Net cash provided by (used in) financing activities	61,549		11,828	-43,285
Net (decrease) increase in cash and cash equivalents	-8,764		26,132	-18,905
Cash and cash equivalents at beginning of year	130,400		104,268	123,173
Cash and cash equivalents at end of year	121,636		130,400	104,268
Supplemental disclosures of cash flow information:
Cash paid for interest	5,422		3,678	4,608
Cash paid for income taxes	15,852		3,574	10,713
Supplemental non-cash disclosures of cash flow information:
Transfers of loans receivable to other real estate owned	1,566		2,974	7,406
Seller-financed sale of other real estate owned	0		250	732
Investment in low income housing tax credit partnership and related funding commitment	3,817		0	0
Purchases of investment securities available for sale not settled	1,288		0	0
Common stock issued for business combinations	226,235	[1]	24,195	0
Stock issuance costs in connection with business combinations	489		0	0
Assets acquired (liabilities assumed) in merger and acquisitions:
Other interest earning deposits	0		14,869	0
Investment securities available for sale	458,312		34,197	0
Investment securities held to maturity	0		22,908	0
Loans held for sale	3,923		0	0
Noncovered loans receivable	895,978		168,580	0
Covered loans receivable	107,050		0	0
Other real estate owned	7,121		2,279	0
Premises and equipment	31,776		6,772	0
Federal Home Loan Bank stock	7,064		454	0
FDIC indemnification asset	7,174		0	0
Accrued interest receivable	4,943		697	0
Bank owned life insurance	32,519		0	0
Prepaid expenses and other assets	14,852		7,135	0
Other intangible assets	11,194		1,072	0
Deposits	-1,433,894		-267,455	0
Junior subordinated debentures	-18,937		0	0
Accrued expenses and other liabilities	($24,067)		($1,528)	$0
[1]	The amount of common stock issued in connection with the merger is net of $489,000 of issuance costs.

Description_of_Business_Basis_

Description of Business, Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business, Basis of Presentation and Significant Accounting Policies and Recent Issued Accounting Policies	Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements
	(a) Description of Business
	Heritage Financial Corporation ("Heritage" or the “Company”) is a bank holding company that was incorporated in the State of Washington in August 1997. The Company is primarily engaged in the business of planning, directing and coordinating the business activities of its wholly-owned bank subsidiary, Heritage Bank (the “Bank”). The Bank is a Washington-chartered commercial bank and its deposits are insured by the FDIC under the Deposit Insurance Fund. The Bank is headquartered in Olympia, Washington and conducts business from its sixty-six branch offices located throughout Washington State and the greater Portland, Oregon area. The Bank’s business consists primarily of lending and deposit relationships with small businesses and their owners in its market areas and attracting deposits from the general public. The Bank also makes real estate construction and land development loans and consumer loans and originates first mortgage loans on residential properties primarily located in its market area which is concentrated along the I-5 corridor from Whatcom County to Clark County in Washington State and Multnomah County in Oregon, as well as other contiguous markets.
	The Company has expanded its footprint through mergers and acquisitions. The largest of these transactions was the strategic merger of Washington Banking Company (“Washington Banking”) into the Company and the merger of its wholly owned subsidiary bank, Whidbey Island Bank ("Whidbey") into Heritage Bank. This merger was effective on May 1, 2014 and is referred to as the "Washington Banking Merger". The strategic merger is described in more detail in "Note 2 - Business Combinations." The Washington Banking results since May 1, 2014 are included in this Annual Report on Form 10-K. The Washington Banking Merger has allowed the expansion of the market area north of Seattle, Washington to the Canadian border.
	In connection with the Washington Banking Merger, the Company acquired Washington Banking Master Trust (the “Master Trust”), which became a wholly-owned subsidiary of the Company. The Master Trust was formed by Washington Banking in April 2007 for the exclusive purpose of issuing trust preferred securities.
	(b) Basis of Presentation
	The accounting and reporting policies of the Company and its subsidiaries confirm to U.S. Generally Accepted Accounting Principles (“GAAP”). In preparing the Consolidated Financial Statements management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, other than temporary impairments in the fair value of investment securities, expected cash flows of purchased loans and related indemnification asset, fair value measurements, stock-based compensation, impairment of goodwill and other intangible assets and income taxes. Actual results could differ from these estimates.
	The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiary, the Bank. All significant intercompany balances and transactions among the Company and the Bank have been eliminated in consolidation.
	For financial reporting purposes, the Company's investment in the Master Trust is accounted for under the equity method and is included in prepaid expenses and other assets on the Company's Consolidated Statements of Financial Condition. The junior subordinated debentures issued and guaranteed by the Company and held by the Master Trust are reflected as liabilities on the Company's Consolidated Statements of Financial Condition.
	Certain prior year amounts have been reclassified to conform to the current year’s presentation. Reclassifications had no effect on the prior year's net income or stockholders’ equity. As a result of the Washington Banking Merger, the Company reclassified its loan portfolio. Total loans receivable are now presented in two categories: noncovered loans receivable and covered loans receivable. A description of the categories is included in the significant accounting policies below. Management made the change to be more comparable to its peers.
	(c) Significant Accounting Policies
	Cash and Cash Equivalents
	For purposes of reporting cash flows, cash and cash equivalents includes cash on hand and in banks, interest earning deposits with original maturities of 90 days or less, and federal funds sold. Net cash flows are reported for customer loan and deposit transactions, other interest bearing deposits, federal funds sold and repurchase agreements.
	Investment Securities
	The Company identifies investments as held to maturity or available for sale at the time of acquisition. Securities are classified as held to maturity when the Company has the ability and positive intent to hold them to maturity. Securities classified as available for sale are available for future liquidity requirements and may be sold prior to maturity.
	Investment securities held to maturity are recorded at cost, adjusted for amortization of premiums or accretion of discounts using the interest method. Securities available for sale are carried at fair value. Unrealized gains and losses on securities available for sale are generally excluded from earnings and are reported in other comprehensive income (loss), net of related income taxes. Realized gains and losses on sale of investment securities are computed on the specific identification method.
	Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in interest rates, there has not been significant deterioration in the financial condition of the issuer, and it is not more likely than not that the Company will be required to, nor does it have the intent to sell the security before the anticipated recovery of its remaining carrying value. If any of these criteria is not met, the impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income (loss). The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. If any of these criteria are not met, the entire difference between amortized cost and fair value is recognized as impairment through earnings, and a new cost basis is established for the security. Continued deterioration of market conditions could result in additional impairment losses recognized within the investment portfolio.
	Other factors that may be considered in determining whether a decline in the value of either a debt or an equity security is “other than temporary” include ratings by recognized rating agencies; actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security; the financial condition, capital strength and near-term prospects of the issuer and recommendations of investment advisors or market analysts.
	Loans Held for Sale
	Mortgage loans held for sale are carried at the lower of amortized cost or fair value by loan type. Any loan that management does not have the intent and ability to hold for the foreseeable future or until maturity or payoff is classified as held for sale at the time of origination, purchase or securitization, or when such decision is made. Unrealized losses on such loans are included in income.
	Loans Receivable and Loan Commitments
	Noncovered Loans:
	Noncovered loans includes loans originated by the Bank as well as loans acquired in business combinations with no related shared-loss agreements. Loans acquired in a business combination are designated as “purchased” loans. These loans are recorded at their fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date.
	Loans purchased with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are accounted for under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“FASB ASC”) 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, formerly AICPA SOP 03-3 Accounting for Certain Loans or Debt Securities Acquired in a Transfer. These loans are identified as purchased credit impaired ("PCI") loans. In situations where such loans have similar risk characteristics, loans may be aggregated into pools to estimate cash flows. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flow expectation. Expected cash flows at the acquisition date in excess of the fair value of loans are considered to be accretable yield, which is recognized as interest income over the life of the loan or pool using a level yield method if the timing and amount of the future cash flows of the pool is reasonably estimable.
	The cash flows expected over the life of the PCI loan or pool are estimated quarterly using an internal cash flow model that projects cash flows and calculates the carrying values of the loans or pools, book yields, effective interest income and impairment, if any, based on loan or pool level events. Assumptions as to default rates, loss severity and prepayment speeds are utilized to calculate the expected cash flows. To the extent actual or projected cash flows are less than previously estimated, additional provisions for loan losses on the purchased loan portfolios will be recognized immediately into earnings. To the extent actual or projected cash flows are more than previously estimated, the increase in cash flows is recognized immediately as a recapture of provision for loan losses up to the amount of any provision previously recognized for that loan or pool, if any, then prospectively recognized in interest income as a yield adjustment. Any disposals of a loan in a pool, including sale of a loan, payment in full or foreclosure results in the removal of the loan from the loan pool at the carrying amount.
	Loans accounted for under FASB ASC 310-30 are generally considered accruing and performing loans as the loans accrete interest income over the estimated life of the loan when cash flows are reasonably estimable. Accordingly, PCI loans that are contractually past due are still considered to be accruing and performing loans. If the timing and amount of cash flows is not reasonably estimable, the loans may be classified as nonaccrual loans and interest income may be recognized on a cash basis or all cash payments may be accounted for a as a reduction of the principal amount outstanding.
	Loans purchased that are not accounted for under FASB ASC 310-30 are accounted for under FASB ASC 310-20, Receivables—Nonrefundable fees and Other Costs, formerly SFAS 91 Nonrefundable fees and Other Costs. These loans are identified as non-PCI loans, and are initially recorded at their fair value, which is estimated using an internal cash flow model and assumptions similar to the FASB ASC 310-30 loans. The difference between the estimated fair value and the unpaid principal balance at acquisition date is recognized as interest income over the life of the loan using an effective interest method for non-revolving credits or a straight-line method, which approximates the effective interest method, for revolving credits. Any unrecognized discount for a loan that is subsequently repaid will be recognized immediately into income.
	Loans are generally recorded at the unpaid principal balance, net of premiums, unearned discounts and net deferred loan origination fees and costs. The premiums and unearned discounts may include values determined in purchase accounting. Interest on loans is calculated using the simple interest method based on the daily balance of the principal amount outstanding and is credited to income as earned. Loans are considered past due or delinquent when principal or interest payments are past due 30 days or more. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Delinquent loans may remain on accrual status between 30 days and 89 days past due. The accrual of interest is discontinued at the time the loan is 90 days delinquent unless the credit is well secured and in the process of collection. Loans are placed on nonaccrual at an earlier date if collection of the contractual principal or interest is doubtful. All interest accrued but not collected on loans deemed nonaccrual during the period is reversed against interest income in that period. The interest payments received on nonaccrual loans is accounted for on the cost-recovery method whereby the interest payment is applied to the principal balances. Loans may be returned to accrual status when improvements in credit quality eliminate the doubt as to the full collectability of both interest and principal and a period of sustained performance has occurred. Substantially all loans that are nonaccrual are also impaired. Income recognition on impaired loans conforms to that used on nonaccrual loans.
	Loans are charged-off if collection of the contractual principal or interest as scheduled in the loan agreement is doubtful. The Company's policies for placing loans on nonaccrual status, recording payments received on nonaccrual loans, resuming accrual of interest, determining past due or delinquency status and charging off uncollectible loans generally do not differ by loan segments or classes. However, credit card loans and other consumer loans are typically charged-off no later than 180 days past due.
	Covered Loans:
	Purchased loans subject to FDIC shared-loss agreements are identified as “covered” on the Consolidated Statements of Financial Condition. The covered loans have an additional evaluation separate from noncovered loans as they have shared-loss attributes which may reduce the Bank’s risk of loss. For further information see Note 8, “FDIC Indemnification Asset”. The covered loans include the majority of loans from the Company's acquisition of Cowlitz Bank and certain loans from the Washington Banking Merger, which included loans from Washington Banking's acquisitions of City Bank and North County Bank. The same accounting principles applicable to noncovered loans receivable apply to covered loans receivable, with the added benefit of shared-loss agreements.
	Unfunded Loan Commitments:
	Unfunded loan commitments are generally related to the unused portion of the total commitment of a loan or providing credit facilities to clients of the Bank and are not actively traded financial instruments. These unfunded commitments are disclosed as financial instruments with off-balance sheet risk in Notes 17 and 20 in the Notes to Consolidated Financial Statements.
	Impaired Loans and Troubled Debt Restructures
	Impaired Loans:
	A loan is considered impaired when, based on current information and events, it is probable the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrowers, including length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amounts of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, or as a practical expedient the loan’s observable market price or the fair value of the collateral (less cost to sell) if the loan is collateral dependent.
	Troubled Debt Restructures:
	A troubled debt restructured loan (“TDR”) is a restructuring in which the Bank, for economic or legal reasons related to a borrower’s financial difficulties, grants a concession to a borrower that it would not otherwise consider. These concessions may include changes of the interest rate, forbearance of the outstanding principal or accrued interest, extension of the maturity date, delay in the timing of the regular payment, or any other actions intended to minimize potential losses. The Bank does not forgive principal for a majority of its TDRs, but in those situations where principal is forgiven, the entire amount of such principal forgiveness is immediately charged off to the extent not done so prior to the modification. The Bank also considers insignificant delays in payments when determining if a loan should be classified as a TDR.
	A loan that has been placed on nonaccrual status that is subsequently restructured will usually remain on nonaccrual status until the borrower is able to demonstrate repayment performance in compliance with the restructured terms for a sustained period, typically for six months. A restructured loan may return to accrual status sooner based on other significant events or mitigating circumstances. A loan that has not been placed on nonaccrual status may be restructured and such loan may remain on accrual status after such restructuring. In these circumstances, the borrower has made payments before the restructuring and is expected to continue to perform after the restructuring. Generally, this type of restructuring involves a reduction in the loan interest rate and/or a change to interest-only payments for a period of time. The restructured loan is considered impaired despite the accrual status and a specific valuation allowance, is any, is calculated in the manner previously described.
	A TDR is considered defaulted if, during the 12-month period after the restructure, the loan has not performed in accordance to the restructured terms. Defaults include loans whose payments are 90 days or more past due and loans whose revised maturity date passed and no further modifications will be granted for that borrower.
	A loan may subsequently be excluded from the TDR disclosures if: (i) the restructured interest rate was greater than or equal to the interest rate of a new loan with comparable risk at the time of the restructure, and (ii) the loan is no longer impaired based on the terms of the restructured agreement. The Bank's policy is that the borrower must demonstrate a sustained period, typically six consecutive months, of payments in accordance with the modified loan before it can be reviewed for removal from the TDR disclosure under the second criteria. However, the loan must be reported as a TDR in at least one annual report on Form 10-K. Once a loan has been classified as a TDR, it will continue to be disclosed as an impaired loan until paid off or charged-off, even if the loan subsequently is no longer disclosed as a TDR.
	Loan Fees and Costs
	Loan origination fees and certain direct origination costs are deferred and amortized as an adjustment of the yields of the loans over their contractual lives, adjusted for prepayment of the loans, using the effective interest method or the straight-line method, when the straight-line method approximates the effective interest method. In the event loans are sold, the net deferred loan origination fees or costs are recognized as a component of the gains or losses on the sales of loans.
	Allowance for Loan Losses
	Allowance for Loan Losses on Loans:
	The allowance for loan losses is a reserve established through a provision for loan losses charged to expense, which represents management’s best estimate of probable losses that have been incurred within the existing portfolio of loans originated by the Bank. The allowance for loan losses on loans designated as non-PCI loans is similar to the methodology described below except that for non-PCI loans, the remaining unaccreted discounts resulting from the fair value adjustments recorded at the time the loans were purchased are additionally factored into the allowance methodology. The allowance for loan losses on PCI loans is described in the “Allowance for Loan Losses on Purchased Credit Impaired Loans” section below.
	The allowance, in the judgment of management, is necessary to reserve for estimated loan losses from risks inherent in the loan portfolio. The Company’s allowance for loan losses methodology includes allowance allocations calculated in accordance with FASB ASC 310, Receivables and allowance allocations calculated in accordance with FASB ASC 450, Contingencies. Accordingly, the methodology is based on historical loss experience by type of credit and internal risk grade, specific homogeneous risk pools and specific loss allocations, with adjustments for current events and conditions. The Company’s process for determining the appropriate level of the allowance for loan losses is designed to account for credit deterioration as it occurs. The provision for loan losses reflects loan quality trends, including the levels of and trends related to nonaccrual loans, past due loans, potential problem loans, criticized loans and net charge-offs or recoveries, among other factors. The provision for loan losses also reflects all actions taken on all loans for a particular period. Therefore, the amount of the provision reflects not only the necessary increases in the allowance for loan losses related to newly identified criticized loans, but it also reflects actions taken related to other loans including, among other things, any necessary increases or decreases in specific valuation allowances for impaired loans or loan pools. Losses are charged against the allowance when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.
	The level of the allowance reflects management’s continuing evaluation of known and inherent risks in the loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off.
	Loans which management determines are impaired are individually evaluated for impairment, and specific valuation allowances are recorded, if any, on these loans based on the methodology previously described. Loans that are determined not to meet management's definition of impaired are collectively evaluated for impairment based on (i) historical loss factor determined in accordance with FASB ASC 450 based on historical loan loss experience for similar loans with similar characteristics and trends; and (ii) environmental loss factors that reflect the impact of current conditions, as determined in accordance with FASB ASC 450 based on general economic conditions and other qualitative risk factors both internal and external to the Company. The historical loss factors and environmental loss factors are combined and multiplied against the outstanding principal balances of loans in pools of similar loans with similar characteristics.
	The Company evaluates specific loans for credit quality indicators and performs regular analysis and evaluation of problem loans. Loans are classified based on an internal credit risk grading process that evaluates, among other things: (i) the obligor’s ability to repay; (ii) the underlying collateral, if any; and (iii) the economic environment and industry in which the borrower operates. This analysis is performed at the loan officer level for all loans. When a loan is performing but has an assigned risk grade other than pass, the loan officer analyzes the loan to determine an appropriate monitoring and collection strategy. When a loan is nonperforming or has been classified as a nonaccrual loan, a member from the special assets department will analyze the loan to determine if it is impaired. If the loan is considered impaired, the special asset department will evaluate the need for a specific valuation allowance on the loan. Specific valuation allowances are determined by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and economic conditions affecting the borrower’s industry, among other things.
	Historical loss factors are calculated based on the historical loss experience and recovery experience of specific classes of loans. The Company calculates historical loss ratios for the classes of loans based on the proportion of actual charge-offs and recoveries experienced to the total loans in the pool for a rolling twelve quarter average.
	Environmental loss factors are based on general economic conditions and other qualitative risk factors both internal and external to the Company. In general, such valuation allowances are determined by evaluating, among other things: (i) levels of and trends in delinquencies and impaired loans; (ii) levels and trends in charge-offs and recoveries; (iii) effects of changes in risk selection and underwriting standards, and other changes in lending policies, procedures, and practices; (iv) experience, ability, and depth of lending management and other relevant staff; (v) national and local economic trends and conditions; (vi) external factors such as competition, legal, and regulatory and; (vii) effects of changes in credit concentrations. Management evaluates the degree of risk that each one of these components has on the quality of the loan portfolio on a quarterly basis. Each component is determined to be on a scale of risk. The results are then utilized in a matrix to determine an appropriate environmental loss factor for each class of loan. An additional environmental factor is added after the calculated matrix factor if the specific loan is risk graded worse than a rating of "watch".
	The allowance for loan losses evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. While management utilizes its best judgment and information available to recognize losses on loans, future additions to the allowance may be necessary based on declines in local and national economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Bank’s allowance for loan losses. Such agencies may require the Bank to make adjustments to the allowance based on their judgments about information available to them at the time of their examinations. The Company believes the allowance for loan losses is appropriate given all of the above considerations.
	Allowance for Loan Losses on Purchased Credit Impaired Loans:
	The PCI loans acquired in the Company's mergers and acquisitions are subject to the Company’s internal and external credit review. Under the accounting guidance of FASB ASC 310-30, the allowance for loan losses on PCI loans is measured at each financial reporting period, or measurement date, based on expected cash flows. If and when credit deterioration, or decreases in expected cash flows initially estimated, occurs subsequent to the acquisition date, a provision for loan losses will be charged to earnings as of the measurement date. For the covered PCI loans, a provision for loan losses is charged to earnings for the full amount without regard to the FDIC shared-loss agreement, and the portion of the loss reimbursable from the FDIC is recorded in noninterest income and increases the FDIC indemnification asset.
	Allowance for Losses on Unfunded Commitments:
	The Bank is also party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit risk in excess of the disbursed amounts recognized in the Consolidated Statements of Financial Condition. The Company has a policy in which it evaluates the risk on a quarterly basis, and provides for an allowance for credit losses, as necessary. The methodology is similar to the allowance for loan losses, and includes an estimate of the probability of drawdown of the loan commitment. Based on its analysis, the Company has recorded an allowance for off-balance sheet financial instruments of $170,000 and $110,000 as of December 31, 2014 and 2013, respectively. This allowance is reported within accrued expenses and other liabilities on the Company's Consolidated Statements of Financial Condition.
	Mortgage Banking Operations
	Prior to the second quarter of 2013 and subsequent to the second quarter 2014, the Company sells one-to-four family residential loans on a servicing released basis and recognized a cash gain or loss. A cash gain or loss is recognized to the extent that the sales proceeds of the loans sold differ from the net book value at the time of sale. Income from one-to-four family residential loans brokered to other lenders is recognized into income on date of loan closing.
	Commitments to sell one-to-four family residential loans are made primarily during the period between the taking of the loan application and the closing of the loan. The timing of making these sale commitments is dependent upon the timing of the borrower’s election to lock-in the mortgage interest rate and fees prior to loan closing. Most of these sale commitments are made on a best-efforts basis whereby the Bank is only obligated to sell the loan if the loan is approved and closed by the Bank. Commitments to fund one-to-four family residential loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these loans are accounted for as free standing derivatives. Fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates between the date the interest on the loan was locked and the balance sheet date. The Company enters into forward commitments for the future delivery of one-to-four family residential loans when interest rate locks are entered into, in order to hedge the interest rate risk resulting from its commitments to fund the loans. Changes in the fair values of these derivatives are included in other income. The fair value of these derivative instruments was not significant at December 31, 2014. As there were no such commitments at December 31, 2013, there was no associated derivative at that date.
	FDIC Indemnification Asset
	The FDIC indemnification asset was measured at estimated fair value at acquisition dates on the same basis as the covered loans, and represents the present value of the estimated losses on covered loans to be reimbursed by the FDIC. The present value was calculated using the shorter of the shared-loss agreement terms or the life of the loan. Under the terms of the FDIC shared-loss agreements, the FDIC absorbs 80% of losses and receives 80% of loss recoveries for the covered loans during the terms of the agreements. Certain shared-loss agreements have loss minimums or tranches which may reduce the shared-loss percentages during the coverage period. The FDIC indemnification asset is reduced as losses are recognized on covered loans and shared-loss payments are received from the FDIC. Since the FDIC indemnification asset was initially recorded at estimated fair value using a discount rate, a portion of the discount is accreted into noninterest income during each reporting period.
	The FDIC indemnification asset is evaluated quarterly. Realized losses in excess of prior estimates immediately increase the FDIC indemnification asset by a credit to noninterest income. Conversely, if realized losses are less than prior estimates, the FDIC indemnification asset is reduced by a charge to noninterest income on a prospective basis, and any change in value would be limited to the contractual terms of the shared-loss agreements.
	Other Real Estate and Other Assets Owned
Other real estate acquired by the Company in satisfaction of debt is held for sale and recorded at fair value at time of foreclosure. When property is acquired, it is recorded at the estimated fair value (less the costs to sell) at the date of acquisition, not to exceed net realizable value, and any resulting write-down is charged to the allowance for loan losses. After acquisition, all costs incurred in maintaining the property are expensed. Costs relating to the development and improvement of the property, however, are capitalized to the extent of the property’s net realizable value.
Premises and Equipment
Premises and equipment, including leasehold improvements, are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the lease period, whichever is shorter. The estimated useful lives used to compute depreciation and amortization for buildings and building improvements is 15 to 39 years; and for furniture, fixtures and equipment is three to seven years. The Company reviews buildings, leasehold improvements and equipment for impairment whenever events or changes in the circumstances indicate that the undiscounted cash flows for the property are less than its carrying value. If identified, an impairment loss is recognized through a charge to earnings based on the fair value of the property.
Bank Owned Life Insurance
The Company has bank owned life insurance (“BOLI”), the majority of which was acquired in the Washington Banking Merger with fair value totaling $32.5 million at May 1, 2014. These policies insure the lives of certain current or former Bank officers or former Whidbey officers, and name the Bank as beneficiary. Noninterest income is generated tax-free (subject to certain limitations) from the increase in the policies' underlying investments made by the insurance company.  The Bank utilizes BOLI to partially offset costs associated with employee compensation and benefit programs with the earnings on the BOLI. The Company records BOLI at the amount that can be realized under the insurance contract at the statement of financial condition date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Other Intangible Assets
The other intangible assets represents the Core Deposit Intangible (“CDI”) acquired in business combinations. The fair value of the CDI stemming from any given business combination is based on the present value of the expected cost savings attributable to the core deposit funding, relative to an alternative source of funding. The CDI is amortized over an estimated useful life which approximates the existing deposit relationships acquired on an accelerated method. The Company evaluates such identifiable intangibles for impairment when an indication of impairment exists.
Goodwill
The Company’s goodwill represents the excess of the purchase price over the fair value of net assets acquired in the purchases of Washington Banking Company in 2014, Valley Community Bancshares in 2013, Western Washington Bancorp in 2006 and North Pacific Bank in 1998. The Company’s goodwill is assigned to Heritage Bank and is evaluated for impairment at the Heritage Bank level (reporting unit).
In accordance with Accounting Standards Update ("ASU") 2011-08 Intangibles – Goodwill and Other (Topic 350), an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. In other words, before the first step of the existing guidance, the entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that the fair value of goodwill is less than carrying value. The qualitative assessment includes adverse events or circumstances identified that could negatively affect the reporting units’ fair value as well as positive and mitigating events. Such indicators may include, among others: a significant change in legal factors or in the general business climate; significant change in the Company’s stock price and market capitalization; unanticipated competition; and an action or assessment by a regulator. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step process is unnecessary. The entity has the option to bypass the qualitative assessment step for any reporting unit in any period and proceed directly to the first step of the exiting two-step process. The entity can resume performing the qualitative assessment in any subsequent period.
The first step of the goodwill impairment test is performed, when considered necessary, by comparing the reporting unit’s aggregate fair value to its carrying value. Absent other indicators of impairment, if the aggregate fair value exceeds the carrying value, goodwill is not considered impaired and no additional analysis is necessary. If the carrying value of the reporting unit were to exceed the aggregate fair value, a second step would be performed to measure the amount of impairment loss, if any. To measure any impairment loss the implied fair value would be determined in the same manner as if the reporting unit were being acquired in a business combination. If the implied fair value of goodwill is less than the recorded goodwill, an impairment charge would be recorded for the difference.
Income Taxes
The Company and its bank subsidiary file a United States consolidated federal income tax return and an Oregon State income tax return. Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates applicable to taxable income in the periods in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rate is recognized in income in the period that includes the enactment date. A valuation allowance, if needed, reduces deferred tax assets to the amounts expected to be realized.
A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
The Company’s policy is to recognize interest and penalties on unrecognized tax benefits in “income taxes” in the Consolidated Statements of Income as the amounts are generally insignificant each year.
Employee Stock Ownership Plan
The Company sponsored an Employee Stock Ownership Plan ("ESOP"). The ESOP purchased 2% of the common stock issued in a January 1998 stock offering and borrowed $1.3 million from the Company in order to fund the purchase of the Company’s common stock. The loan to the ESOP was repaid in full as of December 31, 2012. When outstanding, the loan was repaid principally from the Bank's contributions to the ESOP. The Bank's contributions were sufficient to service the debt over the 15-year loan term at the interest rate of 8.5% . As the debt was repaid, shares were released and allocated to plan participants based on the proportion of debt service paid during the year. As shares were released, compensation expense was recorded equal to the then current market price of the shares and the shares became outstanding for earnings per common share calculations. Cash dividends on allocated shares were recorded as a reduction of retained earnings and paid or distributed directly to participants’ accounts. Cash dividends on unallocated shares were recorded as a reduction of debt and accrued interest.
Stock-Based Compensation
The Company maintains a number of stock-based incentive programs, which are discussed in more detail in Note 21, "Stock-Based Compensation." Compensation cost is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. The Company did not grant stock option awards for the years ended December 31, 2014, 2013 or 2012, other than the options granted in 2014 as part of the Washington Banking Merger. The fair value of stock options granted would be estimated on the date of grant using the Black-Scholes-Merton option pricing model. The market price of the Company’s common stock at the date of grant is used for the restricted stock awards. Compensation cost is recognized over the requisite service period, generally defined as the vesting period, on a straight-line basis.
Deferred Compensation Plans
The Company has adopted a Deferred Compensation Plan and has entered into arrangements with certain executive officers. Under the Plan, participants are permitted to elect to defer compensation and the Company has the discretion to make additional contributions to the Plan on behalf of any participant based on a number of factors. Such discretionary contributions are generally approved by the Compensation Committee of the Company's Board of Directors. The notional account balances of participants under the Plan earn interest on an annual basis. The applicable interest rate is the Moody’s Seasoned Aaa Corporate Bond Yield as of January 1 of each year. Generally, a participant’s account is payable upon the earliest of the participant’s separation from service with the Company, the participant’s death or disability, or a specified date that is elected by the participant in accordance with applicable rules of the Internal Revenue Code. The Company’s obligation to make payments under the Plan is a general obligation of the Company and is to be paid from the Company’s general assets. As such, participants are general unsecured creditors of the Company with respect to their participation under the Plan. The Company records a liability within accrued expenses and other liabilities on the Consolidated Statements of Financial Condition and records compensation expense in a systematic and rationale manner. Since the amounts earned are generally based on the Company’s annual performance, the Company records deferred compensation expense each year for an amount calculated based on that year’s financial performance.
Earnings per Share
Basic earnings per common share is net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options. Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
Operating Segments
While the Company’s chief decision-makers monitor the revenue streams of the various products and services, operations are managed and financial performance is evaluated on a Company-wide basis. Operating segments are aggregated into one as operating results for all segments are similar. Accordingly, all of the financial service operations are considered by management to be aggregated in one reportable operating segment.
(d) Recently Issued Accounting Pronouncements
FASB ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, A Similar Tax Loss, or a Tax Credit Carryforward Exists, was issued in July 2013. This Update provides that an unrecognized tax benefit, or a portion thereof, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except to the extent that a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date to settle any additional income taxes that would result from disallowance of a tax position, or the tax law does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented as a liability. This Update was effective for the Company for the year ended December 31, 2014. The adoption of this Update did not have a material impact on the Company's Consolidated Financial Statements.
FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, was issued in January 2014.  The objective of this Update is to provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The Update permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the consolidated statements of income as a component of income tax expense (benefit). The standard will be effective for the Company beginning January 1, 2015; however, early adoption was permitted. The Company adopted the provisions of this Update during the year ended December 31, 2014. The adoption of this Update did not have a material impact on the Company’s Consolidated Financial Statements.
FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, was issued in January 2014. This Update intends to reduce variations in practice by clarifying when an in-substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The Update states that the real estate property should be recognized upon either the creditor obtaining legal title or the borrower conveying all interest through a deed in lieu of foreclosure or similar legal agreement. The Update is effective for interim and annual reporting periods beginning after December 15, 2014. Early adoption is permitted. The Company adopted the amendments in the first quarter of 2014. The adoption did not have an impact on the Company's Consolidated Financial Statements.
FASB ASU 2014-09, Revenue from Contracts with Customers, was issued in May 2014. Under this Update, FASB created a new Topic 606 which is in response to a joint initiative of FASB and the International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and international financial reporting standards that would:
1	Remove inconsistencies and weaknesses in revenue requirements.
2	Provide a more robust framework for addressing revenue issues.
3	Improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets.
4	Provide more useful information to users of financial statements through improved disclosure requirements.
5	Simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer.
The Update is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. The Company is currently evaluating the impact that this Update will have on its Consolidated Financial Statements.
FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, was issued in June 2014. This Update aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements, such as secured borrowings. The guidance eliminates sale accounting and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement. The Update requires new and expanded disclosures that are effective for interim or annual reporting periods beginning after December 15, 2014. Early adoption for a public company is prohibited. The Company does not anticipate the adoption of this Update will have a material impact on its Consolidated Financial Statements.
FASB ASU 2014-14, Receivables - Troubled Debt Restructurings by Creditors: Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure, was issued in August 2014 to reduce the diversity of classification of government-guaranteed mortgages upon foreclosure. The Update requires that mortgage loans be derecognized and that a separate other receivable be recognized upon foreclosure if certain conditions are met. The separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in this Update are effective for interim and annual periods beginning after December 15, 2014. Early adoption is permitted. The Company adopted the amendment in the third quarter of 2014. The adoption did not have an impact on the Company's Consolidated Financial Statements.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations	Business Combinations
	During the year ended December 31, 2014, the Company completed the merger of Washington Banking Company, referred to as the "Washington Banking Merger". During the year ended December 31, 2013, the Company completed the acquisitions of Northwest Commercial Bank and Valley Community Bancshares, referred to jointly as the "NCB and Valley Acquisitions." During the year ended December 31, 2013, the Company also completed the merger of its wholly-owned bank subsidiary Central Valley Bank with and into Heritage Bank. The merger of Central Valley Bank with an into Heritage Bank was a common control merger which had no accounting impact on the consolidated Company. There were no acquisitions or mergers completed during the year ended December 31, 2012.
	Washington Banking Merger
	On October 23, 2013, the Company, along with the Bank, and Washington Banking and its wholly owned subsidiary bank, Whidbey, jointly announced the signing of a merger agreement for the Washington Banking Merger. The Washington Banking Merger was effective on May 1, 2014. Pursuant to the terms of the Washington Banking Merger, Washington Banking branches adopted the Heritage Bank name in all markets, with the exception of six branches in the Whidbey Island markets which have continued to operate using the Whidbey Island Bank name. The primary reasons for the merger were to expand the Company's geographic footprint consistent with its ongoing growth strategy and to achieve operational scale and realize efficiencies of a larger combined organization.
	Under the terms of the merger agreement, Washington Banking shareholders received 0.89000 shares of Heritage common stock and $2.75 in cash for each share of Washington Banking common stock. The terms of the merger agreement also stipulated immediate vesting of the Washington Banking options and restricted stock awards units. At April 30, 2014, the number of Washington Banking common shares outstanding was 15,587,154. The closing price of Heritage common stock was $16.16 as of April 30, 2014. The total consideration transferred by the Company in conjunction with the Washington Banking Merger was $269.6 million and the total number of Heritage shares of common stock issued were 14,000,178. The Company also incurred $489,000 in capitalized stock issuance costs.
	The total consideration transferred in the Washington Banking Merger consisted of the following:
			Washington Banking
			(In thousands)
	Consideration transferred
	Cash paid (1)		$	42,895
	Fair value of common shares issued (2)		224,151
	Fair value of restricted stock unit awards (3)		2,092
	Fair value of common stock options		481
	Total consideration transferred		$	269,619
	-1	Includes $3,000 of cash paid due to fractional shares and $27,000 of cash paid from dissenters.
	-2	Total of 13,870,716 shares issued. Excludes 1,686 shares dissented and paid in cash and 165 fractional shares paid in cash.
	-3	Total number of converted shares was 129,462. Fair value includes 26,783 shares which were forfeited by the Washington Banking stockholder to pay applicable taxes, totaling fair value of $433,000.
	The transaction qualified as a tax-free reorganization for U.S. federal income tax purposes and Washington Banking shareholders did not recognize any taxable gain or loss in connection with the share exchange and the stock consideration received.
	The Washington Banking Merger resulted in $89.7 million of goodwill. This goodwill is not deductible for tax purposes. Subsequent to the goodwill amounts reported in the Form 10-Q for the quarter ended June 30, 2014, the Company recorded adjustments to goodwill totaling $722,000 related to a $489,000 correction of the fair value of consumer loans, a $233,000 correction in the FDIC indemnification asset, a $252,000 correction of the net receivable from the FDIC for losses on covered assets and a $252,000 change in deferred taxes related to correction of tax liabilities. Subsequent to the goodwill amounts reported in the Form 10-Q for the quarter ended September 30, 2014, the Company recorded adjustments to goodwill totaling $118,000 related to a $265,000 correction in the BOLI split-dollar obligation, a $342,000 correction of deferred taxes, and a $489,000 correction in stock issuance costs.
	During the years ended December 31, 2014 and 2013, the Company incurred Washington Banking merger-related costs (including system conversion costs) of approximately $9.1 million and $890,000, respectively.
	The Company expects to finalize the purchase price allocation by March 31, 2015 when the valuation of acquired noncovered and covered loans, related indemnification asset and deferred taxes is completed.
	Valley Community Bancshares
	On March 11, 2013, the Company entered into a definitive agreement to acquire Valley Community Bancshares ("Valley") and its wholly-owned subsidiary, Valley Bank, both headquartered in Puyallup, Washington. The Valley Acquisition was completed on July 15, 2013. Valley operated eight branches prior to acquisition, of which only four were maintained by Heritage Bank. Of the four other branches, three leases were terminated during the fourth quarter of 2013 and one owned branch building was considered held for sale at the time of acquisition.
	Pursuant to the terms of the merger agreement, the shareholders of Valley common stock received $19.50 per share in cash and 1.3611 shares of Heritage common stock per Valley share. The merger consideration for Valley consisted of cash and stock, with $22.0 million paid in cash by the Company and 1,533,267 shares of the Company’s common stock being issued with fair value of $24.2 million. The Company also recognized $157,000 in capitalized costs related to the issuance of its securities.
	The Valley Acquisition resulted in $16.4 million of goodwill. This goodwill is not deductible for tax purposes.
	During the years ended December 31, 2014 and 2013, the Company incurred Valley Acquisition-related costs (including system conversion costs) of approximately $443,000 and $2.1 million, respectively.
	Northwest Commercial Bank
	On September 14, 2012, the Company and Heritage Bank entered into a definitive agreement to acquire Northwest Commercial Bank ("NCB") headquartered in Lakewood, Washington. NCB was a full service commercial bank that operated two branch locations in Lakewood and Auburn, Washington. Prior to the closing of the transaction, NCB redeemed its outstanding preferred stock of approximately $2.0 million issued to the U.S. Department of Treasury in connection with its participation in the Troubled Asset Relief Program Capital Purchase Plan. The NCB Acquisition was completed on January 9, 2013 with the merger of NCB with and into Heritage Bank. After the NCB Acquisition, the NCB Lakewood branch was consolidated into one of Heritage Bank’s full service banking offices in Lakewood, Washington.
	In connection with the NCB Acquisition, the Company paid cash consideration of $3.0 million, or $5.50 per NCB share, to NCB shareholders on January 9, 2013. In addition, pursuant to the merger agreement, the NCB shareholders had the ability to potentially receive an additional cash payment based on an earn-out structure from the sale of a NCB asset included in “other real estate owned.” This contingent payment was factored into the NCB liabilities assumed by Heritage Bank as of the January 9, 2013 acquisition date. This asset was sold by Heritage Bank in June 2013, and the $491,000 of proceeds from the sale were paid to the NCB shareholders in July 2013. The payment of these proceeds did not impact the recorded bargain purchase gain on bank acquisition of $399,000.
	During the years ended December 31, 2013 and 2012, the Company incurred NCB Acquisition-related costs (including system conversion costs) of approximately $794,000 and $616,000. There were no NCB Acquisition-related costs incurred during the year ended December 31, 2014.
	Business Combination Accounting
	The Washington Banking Merger and the NCB and Valley Acquisitions constitute business acquisitions as defined by FASB ASC 805, Business Combinations. FASB ASC 805 establishes principles and requirements for how the acquirer of a business recognizes and measures in its financial statements the identifiable assets acquired and the liabilities assumed.  Heritage was considered the acquirer in the referenced mergers and acquisitions. Accordingly, the preliminary estimates of fair values of the acquired banks' assets, including the identifiable intangible assets, and the assumed liabilities in the merger and acquisitions were measured and recorded as of the respective effective dates of the merger and acquisitions.
	The fair value estimates of the assets acquired and liabilities assumed in the indicated merger and acquisitions were as follows:
		Washington Banking			Valley			NCB
		1-May-14			15-Jul-13			9-Jan-13
		(In thousands)
	Assets
	Cash and cash equivalents	$	74,947		$	40,643		$	2,712
	Other interest earning deposits	—			13,866			1,003
	Investment securities available for sale	458,312			31,444			2,753
	Investment securities held to maturity	—			22,908			—
	Loans held for sale	3,923			—			—
	Noncovered loans receivable	895,978			117,071			51,509
	Covered loans receivable	107,050			—			—
	FDIC indemnification asset	7,174			—			—
	Other real estate owned ($5,122, $0, and $0 covered by FDIC shared-loss agreements, respectively)	7,121			—			2,279
	Premises and equipment	31,776			6,558			214
	Federal Home Loan Bank stock	7,064			366			88
	Bank owned life insurance	32,519			—			—
	Accrued Interest Receivable	4,943			465			232
	Other intangible assets	11,194			916			156
	Prepaid expenses and other assets	14,852			3,087			4,048
	Total assets acquired	1,656,853			237,324			64,994
	Liabilities
	Deposits	1,433,894			207,013			60,442
	Junior subordinated debentures	18,937			—			—
	Accrued expenses and other liabilities	24,067			342			1,186
	Total liabilities assumed	1,476,898			207,355			61,628
	Net assets acquired	$	179,955		$	29,969		$	3,366
	A summary of the net assets purchased, the fair value adjustments and resulting goodwill recognized from the Washington Banking Merger and Valley Acquisition and the resulting bargain purchase gain recognized on the NCB Acquisition are presented in the following table. Goodwill on mergers and acquisitions represents the excess of the consideration transferred over the estimated fair value of the net assets acquired and liabilities assumed. A bargain purchase gain on bank acquisition represents the excess of the estimated fair value of the net assets acquired and liabilities assumed over the value of the consideration paid. The bargain purchase gain in the NCB Acquisition was influenced significantly by the net deferred tax asset acquired. NCB had significant net operating losses and as a result of its estimate of whether or not it was more likely than not that the net deferred tax asset would be realized, had recorded a full valuation allowance on the net deferred tax asset. The Company, however, has reviewed the net deferred tax asset and determined it is more likely than not that the net deferred tax asset would be realized by the Company.
		Washington Banking			Valley			NCB
		1-May-14			15-Jul-13			9-Jan-13
		(In thousands)
	Cost basis of net assets on merger date	$	181,782		$	29,720		$	6,113
Less: Consideration transferred	(269,619		)	(46,323		)	(2,967		)
Fair value adjustments:
Other interest earning deposits	—			162			7
Investment securities	—			—			(2		)
Loans held for sale	86			—			—
Noncovered loans receivable	(12,811		)	(3,003		)	(3,299		)
Covered loans receivable	6,384			—			—
FDIC indemnification asset	357			—			—
Other real estate owned	387			—			(1,301		)
Premises and equipment	(1,540		)	1,837			(69		)
Other intangible assets	10,216			916			156
Prepaid expenses and other assets	(6,416		)	198			2,394
Deposits	(1,737		)	(9		)	(11		)
Junior subordinated debentures	6,837			—			—
Accrued expenses and other liabilities	(3,590		)	149			(622		)
(Goodwill) bargain purchase gain recognized	$	(89,664	)	$	(16,353	)	$	399
The operating results of the Company for the years ended December 31, 2014 and 2013 include the operating results produced by the net assets acquired in the merger and acquisitions since the respective effective dates. Disclosure of the amount of revenue and net income (excluding acquisition-related costs) of Washington Banking, Valley and NCB since the effective dates included in the Company's Consolidated Statements of Income is impracticable due to the integration of the operations and accounting for the merger and acquisitions.
The Company also considered the pro forma requirements of FASB ASC 805 and deemed it not necessary to provide pro forma financial statements as required under the standard for the NCB and Valley Acquisitions as they were not material to the Company. The Company believes that the historical NCB and Valley operating results are not considered of enough significance to be meaningful to the Company’s results of operations.
The pro forma requirements of FASB ASC 805 were necessary for the Washington Banking Merger. The following table presents certain pro forma information, for illustrative purposes only, for the years ended December 31, 2014 and 2013 as if the Washington Banking Merger had occurred on January 1, 2013. The estimated pro forma information combines the historical results of Washington Banking with the Company's consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the Washington Banking Merger occurred on January 1, 2013. In particular, no adjustments have been made to eliminate the impact of the Washington Banking loans previously accounted for under ASC 310-30 that may have been necessary if these loans had been recorded at fair value at January 1, 2013. The pro forma information also does not consider any changes to the provision for loan losses resulting from recorded loans at fair value. Additionally, Heritage expects to achieve further operating savings and other business synergies, including interest income growth, as a result of the Washington Banking Merger which are not reflected in the pro forma amounts in the following table. As a result, actual amounts will differ from the pro forma information presented.
		Pro Forma for the Year Ended December 31,
		2014			2013
		(Dollars In Thousands, except per share amounts)
Net interest income		$	144,470		$	147,267
Net income		35,758			30,718
Basic earnings per common share		$	1.19		$	1.04
Diluted earnings per common share		1.18			1.04

Cash_and_Cash_Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents
	From October 2013 through May 2014, the Company was required to maintain an average reserve balance with the Federal Reserve Bank of San Francisco ("Federal Reserve Bank") or maintain such reserve balance in the form of cash. The Company did not have a cash reserve requirement at December 31, 2014. The required reserve balance at December 31, 2013 was $46.3 million, and was met by holding cash and maintaining an average balance with the Federal Reserve Bank.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	The Company’s investment policy is designed primarily to provide and maintain liquidity, generate a favorable return on assets without incurring undue interest rate and credit risk, and complement the Bank’s lending activities. Securities are classified as either available for sale or held to maturity when acquired.
	(a) Securities by Type and Maturity
	The amortized cost, gross unrealized gains, gross unrealized losses and fair values of investment securities available for sale at the dates indicated were as follows:
		Securities Available for Sale
		31-Dec-14
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	21,414	$	44		$	(31	)	$	21,427
	Municipal securities	170,082		3,139			(184		)	173,037
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	539,859		4,015			(1,475		)	542,399
	Corporate obligations	4,034		—			(24		)	4,010
	Mutual funds and other equities	1,956		17			—			1,973
	Total	$	737,345	$	7,215		$	(1,714	)	$	742,846
		Securities Available for Sale
		31-Dec-13
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	6,098	$	3		$	(62	)	$	6,039
	Municipal securities	49,989		806			(1,735		)	49,060
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	108,466		898			(1,329		)	108,035
	Total	$	164,553	$	1,707		$	(3,126	)	$	163,134
	The amortized cost, gross unrecognized gains, gross unrecognized losses and fair values of investment securities held to maturity at the dates indicated were as follows:
		Securities Held to Maturity
		31-Dec-14
		Amortized		Gross			Gross			Fair
		Cost		Unrecognized			Unrecognized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	1,591	$	167		$	—		$	1,758
	Municipal securities	22,486		643			(11		)	23,118
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	10,866		364			(74		)	11,156
	Private residential collateralized mortgage obligations	871		75			(104		)	842
	Total	$	35,814	$	1,249		$	(189	)	$	36,874
		Securities Held to Maturity
		31-Dec-13
		Amortized		Gross			Gross			Fair
		Cost		Unrecognized			Unrecognized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	1,687	$	153		$	—		$	1,840
	Municipal securities	24,290		200			(184		)	24,306
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	9,129		144			(284		)	8,989
	Private residential collateralized mortgage obligations	1,048		185			(28		)	1,205
	Total	$	36,154	$	682		$	(496	)	$	36,340
	There were no securities classified as trading at December 31, 2014 or December 31, 2013.
	The amortized cost and fair value of securities at December 31, 2014, by contractual maturity, are set forth below. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay obligations with or without call or prepayment penalties.
		Securities Available for Sale					Securities Held to Maturity
		Amortized		Fair			Amortized			Fair Value
		Cost		Value			Cost
		(In thousands)
	Due in one year or less	$	4,148	$	4,171		$	2,895		$	2,912
	Due after one year through three years	31,547		31,693			4,336			4,385
	Due after three years through five years	23,675		24,104			5,490			5,710
	Due after five years through ten years	150,635		151,946			18,558			19,359
	Due after ten years	525,384		528,959			4,535			4,508
Investment securities with no stated maturity	1,956		1,973			—			—
Total	$	737,345	$	742,846		$	35,814		$	36,874
(b) Unrealized Losses and Other-Than-Temporary Impairments
Available for sale investment securities with unrealized losses as of December 31, 2014 and December 31, 2013 were as follows:
	Securities Available for Sale
	31-Dec-14
	Less than 12 Months					12 Months or						Total
						Longer
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
	(In thousands)
U.S. Treasury and U.S. Government-sponsored agencies	$	3,567	$	(31	)	$	—		$	—		$	3,567	$	(31	)
Municipal securities	25,176		(184		)	—			—			25,176		(184		)
Mortgage backed securities and collateralized mortgage obligations-residential:
U.S. Government-sponsored agencies	182,970		(1,475		)	—			—			182,970		(1,475		)
Corporate obligations	2,119		(24		)	—			—			2,119		(24		)
Total	$	213,832	$	(1,714	)	$	—		$	—		$	213,832	$	(1,714	)
	Securities Available for Sale
	31-Dec-13
	Less than 12 Months					12 Months or						Total
						Longer
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
	(In thousands)
U.S. Treasury and U.S. Government-sponsored agencies	$	3,031	$	(62	)	$	—		$	—		$	3,031	$	(62	)
Municipal securities	21,471		(1,242		)	4,644			(493		)	26,115		(1,735		)
Mortgage backed securities and collateralized mortgage obligations-residential:
U.S. Government-sponsored agencies	56,327		(1,184		)	7,758			(145		)	64,085		(1,329		)
Total	$	80,829	$	(2,488	)	$	12,402		$	(638	)	$	93,231	$	(3,126	)
Held to maturity investment securities with unrecognized losses as of December 31, 2014 and December 31, 2013 were as follows:
	Securities Held to Maturity
	31-Dec-14
	Less than 12					12 Months or						Total
	Months					Longer
	Fair		Unrecognized			Fair			Unrecognized			Fair		Unrecognized
	Value		Losses			Value			Losses			Value		Losses
	(In thousands)
Municipal securities	$	2,196	$	(11	)	$	—		$	—		$	2,196	$	(11	)
Mortgage backed securities and collateralized mortgage obligations-residential:
U.S. Government-sponsored agencies	2,553		(74		)	—			—			2,553		(74		)
Private residential collateralized mortgage obligations	558		(104		)	—			—			558		(104		)
Total	$	5,307	$	(189	)	$	—		$	—		$	5,307	$	(189	)
	Securities Held to Maturity
	31-Dec-13
	Less than 12					12 Months or						Total
	Months					Longer
	Fair		Unrecognized			Fair			Unrecognized			Fair		Unrecognized
	Value		Losses			Value			Losses			Value		Losses
	(In thousands)
Municipal securities	$	10,967	$	(184	)	$	—		$	—		$	10,967	$	(184	)
Mortgage backed securities and collateralized mortgage obligations-residential:
U.S. Government-sponsored agencies	4,869		(284		)	—			—			4,869		(284		)
Private residential collateralized mortgage obligations	211		(5		)	124			(23		)	335		(28		)
Total	$	16,047	$	(473	)	$	124		$	(23	)	$	16,171	$	(496	)
The Company has evaluated these securities and has determined that, other than certain private residential collateralized mortgage obligations discussed below, the decline in their value is temporary. The unrealized losses are primarily due to increases in market interest rates and larger spreads in the market for mortgage-related products. The fair value of these securities is expected to recover as the securities approach their maturity date and/or as the pricing spreads narrow on mortgage-related securities. The Company has the ability and intent to hold the investments until recovery of the market value which may be the maturity date of the securities.
To analyze the unrealized losses, the Company estimated expected future cash flows of the private residential collateralized mortgage obligations by estimating the expected future cash flows of the underlying collateral and applying those collateral cash flows, together with any credit enhancements such as subordination interests owned by third parties, to the security. The expected future cash flows of the underlying collateral are determined using the remaining contractual cash flows adjusted for future expected credit losses (which considers current delinquencies and nonperforming assets, future expected default rates and collateral value by vintage and geographic region) and prepayments. The expected cash flows of the security are then discounted at the interest rate used to recognize interest income on the security to arrive at a present value amount. The average discount interest rate used in the valuations of the present value as of December 31, 2014 and 2013 was 9.4% and 6.4%, respectively, and the average prepayment rate for each period was 6.0%.
For the years ended December 31, 2014 and 2013, there were four and eight, respectively, private residential collateralized mortgage obligations determined to be other-than-temporarily impaired. All unrealized losses for the years ended December 31, 2014 and 2013 were deemed to be credit related, and the Company recorded the impairment in earnings. No impairment for the years ended December 31, 2014 and 2013 was recorded through other comprehensive income (loss). For the year ended December 31, 2012, there were eight private residential collateralized mortgage obligations determined to be other-than-temporarily impaired. A portion of the impairment not related to credit losses was recorded through other comprehensive (loss) income for the year ended December 31, 2012.
The following table summarizes activity for the years ended December 31, 2014, 2013 and 2012 related to the amount of impairments on held to maturity securities:
	Life-to-Date Gross Other-Than-Temporary Impairments (1)		Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income (Loss)			Life-to-Date Net
						Other-Than-Temporary Impairments Included in Earnings
	(In thousands)
31-Dec-11	$	2,435	$	1,100		$	1,335
Subsequent impairments	130		52			78
31-Dec-12	2,565		1,152			1,413
Subsequent impairments	38		—			38
December 31, 2013	2,603		1,152			1,451
Subsequent impairments	45		—			45
December 31, 2014	$	2,648	$	1,152		$	1,496
-1	Life-to-date gross other-than-temporary impairments disclosed in this table are not reflective of subsequent recoveries, if any.
(c) Pledged Securities
The following table summarizes the amortized cost and fair value of available for sale and held to maturity securities that are pledged as collateral for the following obligations at December 31, 2014 and December 31, 2013:
	December 31, 2014					December 31, 2013
	Amortized		Fair			Amortized			Fair
	Cost		Value			Cost			Value
	(In thousands)
Washington and Oregon state to secure public deposits	$	150,507	$	153,785		$	80,386		$	80,881
Federal Reserve Bank and FHLB to secure borrowing arrangements	4,430		4,460			—			—
Repurchase agreements	43,676		44,457			34,170			33,893
Other securities pledged	14,828		14,922			—			—
Total	$	213,441	$	217,624		$	114,556		$	114,774
At December 31, 2014 and 2013, total carrying value of pledged securities was $216.7 million and $114.8 million, respectively.

Noncovered_Loans_Receivable

Noncovered Loans Receivable (Noncovered Loans)	12 Months Ended
	Dec. 31, 2014
Noncovered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Noncovered Loans Receivable	Noncovered Loans Receivable
	The Company originates loans in the ordinary course of business and has also acquired loans through FDIC-assisted and open bank transactions. Loans that are not covered by FDIC shared-loss agreements are referred to as "noncovered loans." Disclosures related to the Company’s recorded investment in noncovered loans receivable generally exclude accrued interest receivable and net deferred loan origination fees and costs because they are insignificant.
	Loans acquired in a business combination may be further classified as “purchased” loans. Loans purchased with evidence of credit deterioration since origination for which it is probable that not all contractually required payments will be collected are accounted for under FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. These loans are identified as “purchased credit impaired” ("PCI") loans. Loans purchased that are not accounted for under FASB ASC 310-30 are accounted for under FASB ASC 310-20, Receivables—Nonrefundable Fees and Other Costs.
	(a) Loan Origination/Risk Management
	The Company categorizes loans in one of the four segments of the total loan portfolio: commercial business, real estate construction and land development, one-to-four family residential and consumer. Within these segments are classes of loans to which management monitors and assesses credit risk in the loan portfolios. The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies, and nonperforming and potential problem loans. The Company also conducts internal loan reviews and validates the credit risk assessment on a periodic basis and presents the results of these reviews to management. The loan review process complements and reinforces the risk identification and assessment decisions made by loan officers and credit personnel, as well as the Company’s policies and procedures.
	A discussion of the risk characteristics of each loan portfolio segment is as follows:
	Commercial Business:
	There are three significant classes of loans in the commercial portfolio segment: commercial and industrial loans, owner-occupied commercial real estate and non-owner occupied commercial real estate. The owner and non-owner occupied commercial real estate are both considered commercial real estate loans. As the commercial and industrial loans carry different risk characteristics than the commercial real estate loans, they are discussed separately below.
	Commercial and industrial. Commercial and industrial loans are primarily made based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value. Most commercial and industrial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may include a personal guarantee; however, some short-term loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers.
	Commercial real estate. The Company originates commercial real estate loans within its primary market areas. These loans are subject to underwriting standards and processes similar to commercial and industrial loans, in addition to those of real estate loans. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate involves more risk than other classes of loans in that the lending typically involves higher loan principal amounts, and payments on loans secured by real estate properties are dependent on successful operation and management of the properties. Repayment of these loans may be more adversely affected by conditions in the real estate market or the economy. Owner-occupied commercial real estate loans are generally of lower credit risk than non-owner occupied commercial real estate loans as the borrowers' businesses are likely dependent on the properties.
	One-to-Four Family Residential:
	The majority of the Company’s one-to-four family residential loans are secured by single-family residences located in its primary market areas. The Company’s underwriting standards require that single-family portfolio loans generally are owner-occupied and do not exceed 80% of the lower of appraised value at origination or cost of the underlying collateral. Terms of maturity typically range from 15 to 30 years. Historically, the Company sold most single-family loans in the secondary market and retained a smaller portion in its loan portfolio. From the second quarter of 2013 until May 1, 2014, the Company only originated single-family loans for its loan portfolio. As a result of the Washington Banking Merger, since May 1, 2014 the Company has once again begun originating and selling a majority of its single-family mortgages.
	Real Estate Construction and Land Development:
	The Company originates construction loans for one-to-four family residential and for five or more family residential and commercial properties. The one-to-four family residential construction loans generally include construction of custom homes whereby the home buyer is the borrower. The Company also provides financing to builders for the construction of pre-sold homes and, in selected cases, to builders for the construction of speculative residential property. Substantially all construction loans are short-term in nature and priced with variable rates of interest. Construction lending can involve a higher level of risk than other types of lending because funds are advanced partially based upon the value of the project, which is uncertain prior to the project’s completion. Because of the uncertainties inherent in estimating construction costs as well as the market value of a completed project and the effects of governmental regulation of real property, the Company’s estimates with regard to the total funds required to complete a project and the related loan-to-value ratio may vary from actual results. As a result, construction loans often involve the disbursement of substantial funds with repayment dependent, in part, on the success of the ultimate project and the ability of the borrower to sell or lease the property or refinance the indebtedness. If the Company’s estimate of the value of a project at completion proves to be overstated, it may have inadequate security for repayment of the loan and may incur a loss if the borrower does not repay the loan. Sources of repayment for these types of loans may be pre-committed permanent loans from approved long-term lenders, sales of developed property or an interim loan commitment from the Company until permanent financing is obtained. These loans are closely monitored by on-site inspections and are considered to have higher risks than other real estate loans due to their ultimate repayment being dependent upon successful completion of the construction project, interest rate changes, government regulation of real property, general economic conditions and the availability of long-term financing.
	Consumer:
	The Company originates consumer loans and lines of credit that are both secured and unsecured. The underwriting process for these loans ensures a qualifying primary and secondary source of repayment. Underwriting standards for home equity loans are significantly influenced by statutory requirements, which include, but are not limited to, a maximum loan-to-value percentage of 80%, collection remedies, the number of such loans a borrower can have at one time and documentation requirements. To monitor and manage consumer loan risk, policies and procedures are developed and modified, as needed. The majority of consumer loans are for relatively small amounts disbursed among many individual borrowers which reduces the credit risk for this type of loan. To further reduce the risk, trend reports are reviewed by management on a regular basis.
	As a result of the Washington Banking Merger, the Company is originating indirect consumer loans. These loans are for new and used automobile and recreational vehicles that are originated indirectly by selected dealers located in the Company's market areas. The Company has limited its indirect loans purchased primarily to dealerships that are established and well known in their market areas and to applicants that are not classified as sub-prime.
	Noncovered loans receivable at December 31, 2014 and December 31, 2013 consisted of the following portfolio segments and classes:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	551,343			$	336,540
	Owner-occupied commercial real estate	535,742				281,309
	Non-owner occupied commercial real estate	616,757				399,979
	Total commercial business	1,703,842				1,017,828
	One-to-four family residential	63,540				43,082
	Real estate construction and land development:
	One-to-four family residential	46,749				19,724
	Five or more family residential and commercial properties	61,360				48,655
	Total real estate construction and land development	108,109				68,379
	Consumer	250,323				41,547
	Gross noncovered loans receivable	2,125,814				1,170,836
	Net deferred loan fees	(937		)		(2,670		)
	Noncovered loans receivable, net	2,124,877				1,168,166
	Allowance for loan losses	(22,153		)		(22,657		)
	Noncovered loans receivable, net of allowance for loan losses	$	2,102,724			$	1,145,509
	(b) Concentrations of Credit
	Most of the Company’s lending activity occurs within Washington State, and to a lesser extent Oregon. The Company’s primary market areas have been concentrated along the I-5 corridor from Whatcom County to Clark County in Washington State and Multnomah County in Oregon, as well as other contiguous markets. The Washington Banking Merger has allowed the expansion of the market area north of Seattle, Washington to the Canadian border. The majority of the Company’s loan portfolio consists of (in order of balances at December 31, 2014) non-owner occupied commercial real estate, owner-occupied commercial real estate and commercial and industrial. As of December 31, 2014 and December 31, 2013, there were no concentrations of loans related to any single industry in excess of 10% of the Company’s total loans.
	(c) Credit Quality Indicators
	As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including trends related to (i) the risk grade of the loans, (ii) the level of classified loans, (iii) net charge-offs, (iv) nonperforming loans, and (v) the general economic conditions of the United States of America, and specifically the states of Washington and Oregon. The Company utilizes a risk grading matrix to assign a risk grade to each of its loans. Loans are graded on a scale of 0 to 10. A description of the general characteristics of the risk grades is as follows:
	•	Grades 0 to 5: These grades are considered “pass grade” and include loans with negligible to above average but acceptable risk. These borrowers generally have strong to acceptable capital levels and consistent earnings and debt service capacity. Loans with the higher grades within the “pass” category may include borrowers who are experiencing unusual operating difficulties, but have acceptable payment performance to date. Increased monitoring of financials and/or collateral may be appropriate. Loans with this grade show no immediate loss exposure.
	•	Grade 6: This grade includes "Watch" loans and is considered a “pass grade”. The grade is intended to be utilized on a temporary basis for pass grade borrowers where a potentially significant risk-modifying action is anticipated in the near term.
	•	Grade 7: This grade includes “Other Assets Especially Mentioned” (“OAEM”) loans in accordance with regulatory guidelines, and is intended to highlight loans with elevated risks. Loans with this grade show signs of deteriorating profits and capital, and the borrower might not be strong enough to sustain a major setback. The borrower is typically higher than normally leveraged, and outside support might be modest and likely illiquid. The loan is at risk of further decline unless active measures are taken to correct the situation.
	•	Grade 8: This grade includes “Substandard” loans in accordance with regulatory guidelines, which the Company has determined have a high credit risk. These loans also have well-defined weaknesses which make payment default or principal exposure likely, but not yet certain. The borrower may have shown serious negative trends in financial ratios and performance. Such loans may be dependent upon collateral liquidation, a secondary source of repayment or an event outside of the normal course of business. Loans with this grade can be placed on accrual or nonaccrual status based on the Company’s accrual policy.
	•	Grade 9: This grade includes “Doubtful” loans in accordance with regulatory guidelines, and the Company has determined these loans to have excessive credit risk. Such loans are placed on nonaccrual status and may be dependent upon collateral having a value that is difficult to determine or upon some near-term event which lacks certainty. Additionally, these loans generally have a specific valuation allowance or have been partially charged-off for the amount considered uncollectible.
	•	Grade 10: This grade includes “Loss” loans in accordance with regulatory guidelines, and the Company has determined these loans have the highest risk of loss. Such loans are charged-off or charged-down when payment is acknowledged to be uncertain or when the timing or value of payments cannot be determined. “Loss” is not intended to imply that the loan or some portion of it will never be paid, nor does it in any way imply that there has been a forgiveness of debt.
	Numerical loan grades for all commercial business loans and real estate construction and land development loans are established at the origination of the loan. Prior to November 2014, one-to-four family residential loans and consumer loans (“non-commercial loans”) were not numerically graded at origination date as these loans were determined to be “pass graded” loans. A numeric grade was assigned to these non-commercial loans if subsequent to origination, the credit department evaluated the credit and determined it necessary to classify the loan. Subsequent to November 2014, the non-commercial loans were designated a loan grade “4” at origination date to reflect a "pass grade". The Bank follows its regulator’s Uniform Retail Credit Classification and Account Management Policy for subsequent classification in the event of payment delinquencies or default. Loan grades are reviewed on a quarterly basis, or more frequently if necessary, by the credit department. Typically, an individual loan grade will not be changed from the prior period unless there is a specific indication of credit deterioration or improvement. Credit deterioration is evidenced by delinquency, direct communications with the borrower, or other borrower information that becomes known to management. Credit improvements are evidenced by known facts regarding the borrower or the collateral property.
	The loan grades relate to the likelihood of losses in that the higher the grade, the greater the loss potential. Loans with a pass grade may have some estimated inherent losses, but to a lesser extent than the other loan grades. The OAEM loan grade is transitory in that the Company is waiting on additional information to determine the likelihood and extent of the potential loss. The likelihood of loss for OAEM graded loans, however, is greater than Watch graded loans because there has been measurable credit deterioration. Loans with a Substandard grade are generally loans for which the Company has individually analyzed for potential impairment. For Doubtful and Loss graded loans, the Company is almost certain of the losses, and the unpaid principal balances are generally charged-off to the realizable value.
	The following tables present the balance of the noncovered loans receivable by credit quality indicator as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	509,483			$	14,487			$	27,049			$	324	$	551,343
	Owner-occupied commercial real estate	496,234				22,946				16,562				—		535,742
	Non-owner occupied commercial real estate	584,262				17,643				14,852				—		616,757
	Total commercial business	1,589,979				55,076				58,463				324		1,703,842
	One-to-four family residential	61,185				315				2,040				—		63,540
	Real estate construction and land development:
	One-to-four family residential	34,356				3,977				8,416				—		46,749
	Five or more family residential and commercial properties	57,025				—				4,335				—		61,360
	Total real estate construction and land development	91,381				3,977				12,751				—		108,109
	Consumer	242,836				—				7,487				—		250,323
	Gross noncovered loans	$	1,985,381			$	59,368			$	80,741			$	324	$	2,125,814
	December 31, 2013
	Pass				OAEM				Substandard				Doubtful		Total
	(In thousands)
Commercial business:
Commercial and industrial	$	304,959			$	9,183			$	20,849			$	1,549	$	336,540
Owner-occupied commercial real estate	269,130				3,814				8,365				—		281,309
Non-owner occupied commercial real estate	381,355				9,037				8,723				864		399,979
Total commercial business	955,444				22,034				37,937				2,413		1,017,828
One-to-four family residential	40,245				269				2,568				—		43,082
Real estate construction and land development:
One-to-four family residential	11,582				4,159				3,983				—		19,724
Five or more family residential and commercial properties	45,332				—				3,323				—		48,655
Total real estate construction and land development	56,914				4,159				7,306				—		68,379
Consumer	39,432				248				1,867				—		41,547
Gross noncovered loans	$	1,092,035			$	26,710			$	49,678			$	2,413	$	1,170,836
Noncovered potential problem loans are loans classified as OAEM or worse that are currently accruing interest and are not considered impaired, but which management is monitoring because the financial information of the borrower causes concern as to their ability to meet their loan repayment terms. Noncovered potential problem loans also include PCI loans as these loans continue to accrete loan discounts established at acquisition based on the guidance of ASC 310-30. Noncovered potential problem loans as of December 31, 2014 and December 31, 2013 were $117.3 million and $52.8 million, respectively. The balance of noncovered potential problem loans guaranteed by a governmental agency, which guarantees reduce the Company's credit exposure, was $2.0 million and $1.8 million as of December 31, 2014 and December 31, 2013, respectively.
(d) Nonaccrual Loans
Noncovered nonaccrual loans, segregated by segments and classes of loans, were as follows as of December 31, 2014 and December 31, 2013:
	December 31, 2014				December 31, 2013
	(In thousands)
Commercial business:
Commercial and industrial	$	3,463			$	4,648
Owner-occupied commercial real estate	1,163				1,024
Non-owner occupied commercial real estate	93				3
Total commercial business	4,719				5,675
One-to-four family residential	—				340
Real estate construction and land development:
One-to-four family residential	2,652				1,045
Total real estate construction and land development	2,652				1,045
Consumer	139				678
Gross noncovered nonaccrual loans	$	7,510			$	7,738
The Company had $1.6 million and $1.7 million of noncovered nonaccrual loans guaranteed by governmental agencies at December 31, 2014 and December 31, 2013, respectively.
Noncovered PCI loans are not included in the nonaccrual table above because these loans are accounted for under ASC 310-30, which provides that accretable yield is calculated based on a loan's expected cash flow even if the loan is not performing under its conventional terms.
(e) Past due loans
The Company performs an aging analysis of past due loans using the categories of 30-89 days past due and 90 or more days past due. This policy is consistent with regulatory reporting requirements.
The balances of noncovered past due loans, segregated by segments and classes of loans, as of December 31, 2014 and December 31, 2013 were as follows:
	December 31, 2014
	30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
					Greater				Due								and  Still
																	Accruing (1)
	(In thousands)
Commercial business:
Commercial and industrial	$	2,503			$	1,962			$	4,465			$	546,878	$	551,343	$	—
Owner-occupied commercial real estate	1,038				100				1,138				534,604		535,742		—
Non-owner occupied commercial real estate	113				75				188				616,569		616,757		—
Total commercial business	3,654				2,137				5,791				1,698,051		1,703,842		—
One-to-four family residential	200				—				200				63,340		63,540		—
Real estate construction and land development:
One-to-four family residential	62				2,135				2,197				44,552		46,749		—
Five or more family residential and commercial properties	—				376				376				60,984		61,360		—
Total real estate construction and land development	62				2,511				2,573				105,536		108,109		—
Consumer	2,413				125				2,538				247,785		250,323		—
Gross noncovered loans	$	6,329			$	4,773			$	11,102			$	2,114,712	$	2,125,814	$	—
-1	Excludes PCI loans.
	December 31, 2013
	30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
					Greater				Due								and  Still
																	Accruing (1)
	(In thousands)
Commercial business:
Commercial and industrial	$	2,493			$	4,379			$	6,872			$	329,668	$	336,540	$	—
Owner-occupied commercial real estate	808				849				1,657				279,652		281,309		—
Non-owner occupied commercial real estate	1,161				179				1,340				398,639		399,979		6
Total commercial business	4,462				5,407				9,869				1,007,959		1,017,828		6
One-to-four family residential	571				509				1,080				42,002		43,082		—
Real estate construction and land development:
One-to-four family residential	821				1,045				1,866				17,858		19,724		—
Five or more family residential and commercial properties	384				453				837				47,818		48,655		—
Total real estate construction and land development	1,205				1,498				2,703				65,676		68,379		—
Consumer	210				13				223				41,324		41,547		—
Gross noncovered loans	$	6,448			$	7,427			$	13,875			$	1,156,961	$	1,170,836	$	6
-1	Excludes PCI loans.
(f) Impaired loans
Noncovered impaired loans includes noncovered nonaccrual loans and noncovered performing TDRs. The balance of noncovered impaired loans as of December 31, 2014 and December 31, 2013 are set forth in the following tables.
	December 31, 2014
	Recorded				Recorded				Total				Unpaid		Related
	Investment With				Investment With				Recorded				Contractual		Specific
	No Specific				Specific				Investment				Principal		Valuation
	Valuation				Valuation								Balance		Allowance
	Allowance				Allowance
	(In thousands)
Commercial business:
Commercial and industrial	$	1,134			$	7,906			$	9,040			$	9,349	$	1,325
Owner-occupied commercial real estate	360				2,421				2,781				2,781		684
Non-owner occupied commercial real estate	2,459				4,846				7,305				7,279		465
Total commercial business	3,953				15,173				19,126				19,409		2,474
One-to-four family residential	—				245				245				245		75
Real estate construction and land development:
One-to-four family residential	2,307				2,217				4,524				4,964		396
Five or more family residential and commercial properties	—				2,056				2,056				2,056		234
Total real estate construction and land development	2,307				4,273				6,580				7,020		630
Consumer	33				172				205				208		56
Gross noncovered loans	$	6,293			$	19,863			$	26,156			$	26,882	$	3,235
	December 31, 2013
	Recorded				Recorded				Total				Unpaid		Related
	Investment With				Investment With				Recorded				Contractual		Specific
	No Specific				Specific				Investment				Principal		Valuation
	Valuation				Valuation								Balance		Allowance
	Allowance				Allowance
	(In thousands)
Commercial business:
Commercial and industrial	$	6,140			$	4,850			$	10,990			$	13,287	$	2,716
Owner-occupied commercial real estate	1,118				1,880				2,998				3,023		595
Non-owner occupied commercial real estate	3,300				4,123				7,423				7,412		364
Total commercial business	10,558				10,853				21,411				23,722		3,675
One-to-four family residential	592				—				592				619		—
Real estate construction and land development:
One-to-four family residential	3,773				911				4,684				5,426		211
Five or more family residential and commercial properties	2,404				—				2,404				2,404		—
Total real estate construction and land development	6,177				911				7,088				7,830		211
Consumer	100				678				778				780		153
Gross noncovered loans	$	17,427			$	12,442			$	29,869			$	32,951	$	4,039
The Company had governmental guarantees of $2.4 million and $2.9 million related to the noncovered impaired loan balances at December 31, 2014 and December 31, 2013, respectively.
The average recorded investment of noncovered impaired loans for the years ended December 31, 2014, 2013 and 2012 are set forth in the following table.
	Years Ended December 31,
	2014				2013				2012
	(In thousands)
Commercial business:
Commercial and industrial	$	10,946			$	12,628			$	11,467
Owner-occupied commercial real estate	3,215				2,638				2,141
Non-owner occupied commercial real estate	7,744				7,897				8,174
Total commercial business	21,905				23,163				21,782
One-to-four family residential	514				880				977
Real estate construction and land development:
One-to-four family residential	5,416				4,237				4,381
Five or more family residential and commercial properties	2,154				2,839				5,415
Total real estate construction and land development	7,570				7,076				9,796
Consumer	779				254				427
Gross noncovered impaired loans	$	30,768			$	31,373			$	32,982
For the years ended December 31, 2014, 2013 and 2012, no interest income was recognized subsequent to a loan’s classification as nonaccrual. For the years ended December 31, 2014, 2013 and 2012, the Bank recorded $1.2 million, $1.1 million and $1.0 million, respectively, of interest income related to noncovered performing TDR loans.
(g) Troubled Debt Restructured Loans
A troubled debt restructured loan is a restructuring in which the Bank, for economic or legal reasons related to a borrower’s financial difficulties, grants a concession to the borrower that it would not otherwise consider. TDRs are considered impaired and are separately measured for impairment under FASB ASC 310-10-35, whether on accrual ("performing") or nonaccrual ("nonperforming") status.
The majority of the Bank’s noncovered TDRs are a result of granting extensions of maturity on troubled credits which have already been adversely classified. The Bank grants such extensions to reassess the borrower’s financial status and to develop a plan for repayment. Certain modifications with extensions also include interest rate reductions, which is the second most prevalent concession. Certain TDRs were additionally re-amortized over a longer period of time. The Bank additionally advanced funds to a troubled speculative home builder to complete established projects. These modifications would all be considered a concession for a borrower that could not obtain similar financing terms from another source other than from the Bank.
The financial effects of each modification will vary based on the specific restructure. For the majority of the Bank’s TDRs, the noncovered loans were interest-only with a balloon payment at maturity. If the interest rate is not adjusted and the modified terms are consistent with other similar credits being offered, the Bank may not experience any loss associated with the restructure. If, however, the restructure involves forbearance agreements or interest rate modifications, the Bank may not collect all the principal and interest based on the original contractual terms. The Bank estimates the necessary allowance for loan losses on noncovered TDRs using the same methods used for other noncovered impaired loans.
The recorded investment balance and related allowance for loan losses of noncovered performing and noncovered nonaccrual TDRs as of December 31, 2014 and December 31, 2013 were as follows:
	December 31, 2014								December 31, 2013
	Performing				Nonaccrual				Performing				Nonaccrual
	TDRs				TDRs				TDRs				TDRs
	(In thousands)
Noncovered TDRs	$	18,764			$	5,010			$	22,131			$	2,634
Allowance for loan losses on noncovered TDRs	1,908				1,033				2,957				191
The unfunded commitment to borrowers related to noncovered TDRs was $1.8 million and $4.5 million at December 31, 2014 and December 31, 2013, respectively.
Noncovered loans that were modified as TDRs during the years ended December 31, 2014 and 2013 are set forth in the following table:
	Years Ended December 31,
	2014							2013
	Number of			Outstanding				Number of			Outstanding
	Contracts			Principal Balance				Contracts			Principal Balance
	-1			(1)(2)				-1			(1)(2)
	(Dollars in thousands)
Commercial business:
Commercial and industrial	32			$	5,926			33			$	6,570
Owner-occupied commercial real estate	3			1,063				5			537
Non-owner occupied commercial real estate	3			6,548				2			192
Total commercial business	38			13,537				40			7,299
One-to-four family residential	—			—				1			252
Real estate construction and land development:
One-to-four family residential	10			3,553				24			3,639
Five or more family residential and commercial properties	—			—				1			2,404
Total real estate construction and land development	10			3,553				25			6,043
Consumer	3			219				3			141
Total noncovered TDRs	51			$	17,309			69			$	13,735
-1	Number of contracts and outstanding principal balance represent loans which have balances as of period end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
-2	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bank’s recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification), except when the modification was the initial advance on a one-to-four family residential real estate construction and land development loan under a master guidance line. During the year ended December 31, 2014, the Company's initial advance at the time of modification on these construction loans totaled $45,000, the total commitment amount was $190,000 and the outstanding principal balance at December 31, 2014 was $188,000. During the year ended December 31, 2013, the Company's initial advance at the time of modification on these construction loans totaled $1.1 million, the total commitment amount was $4.3 million and the outstanding principal balance at December 31, 2013 was $2.5 million.
Of the 51 noncovered loans modified during the year ended December 31, 2014, 17 loans with a total outstanding principal balance of $4.7 million had no prior modifications. The remaining noncovered loans included in the tables above for the year ended December 31, 2014 were previously reported as noncovered TDRs. The Bank typically grants shorter extension periods to continually monitor the troubled credits despite the fact that the extended date might not be the date the Bank expects the cash flow. The Company does not consider these modifications a subsequent default of a noncovered TDR as new loan terms, specifically maturity dates, were granted. The potential losses related to these loans would have been considered in the period the loan was first reported as a noncovered TDR and adjusted, as necessary, in the current periods based on more recent information. The related specific valuation allowance for noncovered loans that were modified as TDRs during the year ended December 31, 2014 was $1.8 million at December 31, 2014.
The noncovered loans modified during the previous twelve months ended December 31, 2014 and 2013 that subsequently defaulted during the years ended December 31, 2014 and 2013 are included in the following table:
	Year Ended December 31, 2014							Year Ended December 31, 2013
	Number of			Outstanding				Number of			Outstanding
	Contracts			Principal Balance				Contracts			Principal Balance
	(Dollars in thousands)
Commercial business:
Commercial and industrial	—			$	—			3			$	918
Non-owner occupied commercial real estate	1			75				—			—
Total commercial business	1			75				3			918
Total noncovered loans receivable	1			$	75			3			$	918
The one loan included in the above table defaulted during the year ended December 31, 2014 because it was past its modified maturity date, and the borrower has not repaid the credit. The Bank does not intend to extend the maturity. The three loans which defaulted during the year ended December 31, 2013 defaulted as the loans were greater than 90 days past due at December 31, 2013. At December 31, 2014 and 2013, the Bank had a specific valuation allowance of $4,000 and $63,000, respectively, related to these credits.
(h) Noncovered Purchased Credit Impaired Loans
The Company acquired noncovered PCI loans in the Washington Banking Merger and in previously completed acquisitions which are accounted for under FASB ASC 310-30. These previous acquisitions include the FDIC-assisted acquisitions of Cowlitz Bank ("Cowlitz") and Pierce Commercial Bank ("Pierce") on July 30, 2010 and November 8, 2010, respectively. In addition, the Company completed the acquisitions of NCB on January 9, 2013 and the acquisition of Valley on July 15, 2013.
The following tables reflect the outstanding principal balance and recorded investment at December 31, 2014 and December 31, 2013 of the noncovered PCI loans:
	December 31, 2014								31-Dec-13
	Outstanding Principal				Recorded Investment				Outstanding Principal				Recorded Investment
	(In thousands)
Commercial business:
Commercial and industrial	$	22,144			$	18,040			$	18,193			$	16,779
Owner-occupied commercial real estate	18,165				16,208				5,510				5,119
Non-owner occupied commercial real estate	12,684				11,185				8,276				6,785
Total commercial business	52,993				45,433				31,979				28,683
One-to-four family residential	2,269				2,235				4,055				3,768
Real estate construction and land development:
One-to-four family residential	8,456				4,223				1,967				32
Five or more family residential and commercial properties	2,721				2,963				1,077				1,357
Total real estate construction and land development	11,177				7,186				3,044				1,389
Consumer	5,983				7,055				1,150				2,177
Gross noncovered PCI loans	$	72,422			$	61,909			$	40,228			$	36,017
On the acquisition dates, the amount by which the undiscounted expected cash flows of the noncovered PCI loans exceeded the estimated fair value of the loan is the “accretable yield”. The accretable yield is then measured at each financial reporting date and represents the difference between the remaining undiscounted expected cash flows and the current carrying value of the noncovered PCI loans.
The following tables summarize the accretable yield on the noncovered PCI loans resulting from the Pierce, NCB, Valley and Washington Banking acquisitions for the years ended December 31, 2014, 2013 and 2012.
		Years Ended December 31,
		2014				2013				2012
	(In thousands)
Balance at the beginning of the year		$	7,714			$	7,352			$	14,638
Accretion		(4,305		)		(4,402		)		(6,238		)
Disposal and other		(3,263		)		(318		)		(2,798		)
Change in accretable yield (1)		12,426				5,082				1,750
Balance at the end of the year		$	12,572			$	7,714			$	7,352
-1	Includes accretable difference at acquisition.
On the May 1, 2014 merger date for the Washington Banking Merger, the contractual cash flows on noncovered PCI loans acquired in the Washington Banking Merger were $75.7 million and the expected cash flows were $59.1 million, resulting in a $16.6 million non-accretable difference. The fair value was estimated at $48.9 million, resulting in a $10.2 million accretable yield which is included in the table above as a change in accretable yield for the year ended December 31, 2014. The contractual cash flows on the noncovered non-PCI loans, excluding credit cards, were $1.12 billion and the expected cash flows were $1.06 billion, resulting in $53.5 million of cash flows not expected to be collected. The fair value of the noncovered non-PCI loans, excluding credit cards, at May 1, 2014 was $841.3 million. The credit cards loans acquired in the Washington Banking Merger totaling $5.8 million at merger date were included in noncovered consumer loans totals. The fair value of the credit cards approximated the carrying values; therefore, there was no cash flows not expected to be collected.
(i) Related Party Loans
In the ordinary course of business, the Company has granted loans to certain directors, executive officers and their affiliates (collectively referred to as “related parties”).
Activity in related party loans for the years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):
Balance outstanding at December 31, 2011	$	10,391
Principal additions	8,906
Principal reductions	(7,855		)
Balance outstanding at December 31, 2012	11,442
Principal additions	—
Elimination of outstanding loan balance due to change in related party status	(3,045		)
Principal reductions	(923		)
Balance outstanding at December 31, 2013	7,474
Principal additions	23
Additional of outstanding loan balance due to change in related party status	1,858
Principal reductions	(191		)
Balance outstanding at December 31, 2014	$	9,164
The Company had $228,000 and $184,000 of unfunded commitments to related parties as of December 31, 2014 and 2013, respectively. The Company did not have any borrowings from related parties at December 31, 2014 or 2013.
(j) Mortgage Banking Activities and SBA Loan Sales
The Bank originates certain one-to-four family residential loans to be sold on the secondary market. These loans were presented as loans held for sale. The Bank ceased these mortgage banking activities in the second quarter of 2013, and resumed activities again in the second quarter of 2014 in connection with the Washington Banking Merger. The Bank does not retain servicing on loans sold in the secondary market. Details of certain mortgage banking activities are as follows:
		Years Ended or As of December 31,
		2014				2013
		(In thousands)
Loans held for sale at lower of cost or market		$	5,582			$	—
One-to-four family residential loans sold during the year		55,997				8,460
Commitments to sell mortgage loans		10,625				—
Commitments to fund mortgage loans (at interest rates approximating market rates):
Fixed rate		$	8,467			$	—
Variable or adjustable rate		2,158				—
The Company may chose to sell the conditionally guaranteed portion of certain loans guaranteed by the Small Business Administration or the U.S. Department of Agriculture (collectively referred to as "SBA loans") and retain a participating interest in the unguaranteed portion of the loans. These loans are carried at the aggregate cost. SBA loans are sold with servicing retained. Details of certain SBA loan sales activities are as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
SBA loans serviced for others with participating interest (1)		$	77,233			$	26,854
SBA loans serviced for others with no participating interest		—				—
-1	Represents the gross balance of the loan at year end. The participation owned by the Bank totaled $29.0 million and $9.4 million, respectively, at December 31, 2014 and 2013 and is included in the balance of noncovered loans receivable on the Company's Consolidated Statements of Financial Condition.
There was $260,000, $106,000 and $139,000 of servicing fee income and fees from SBA loans serviced for others for the years ended December 31, 2014, 2013 and 2012. Servicing fee income is reported in other income on the Company's Consolidated Statements of Income.

Covered_Loans_Receivable

Covered Loans Receivable (Covered Loans)	12 Months Ended
	Dec. 31, 2014
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered Loans Receivable	Covered Loans Receivable
	The Company acquired loans through FDIC-assisted transactions which are covered by FDIC shared-loss agreements. These loans are referred to as "covered loans." Covered loans were acquired in the Cowlitz acquisition in July 2010 and with the Washington Banking Merger in May 2014. Included in the covered loans acquired from Washington Banking were loans Washington Banking had acquired from City Bank in April 2010 and North County Bank in September 2010. As part of the Washington Banking Merger, the shared-loss agreements with these acquisitions were transferred to Heritage Bank.
	Loans purchased with evidence of credit deterioration since origination for which it is probable that not all contractually required payments will be collected are accounted for under FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality and are identified as PCI loans. Loans purchased that are not accounted for under FASB ASC 310-30 are accounted for under FASB ASC 310-20, Receivables—Nonrefundable Fees and Other Costs.
	Disclosures related to the Company’s recorded investment in covered loans receivable generally exclude accrued interest receivable because it is insignificant.
	(a) Risk Management
	The Company categorizes covered loans in the same four segments as the noncovered portfolio: commercial business, real estate construction and land development, one-to-four family residential and consumer.
	The recorded investment of covered loans receivable at December 31, 2014 and December 31, 2013 consisted of the following portfolio segments and classes:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	19,110			$	14,690
	Owner-occupied commercial real estate	59,244				24,366
	Non-owner occupied commercial real estate	26,879				14,625
	Total commercial business	105,233				53,681
	One-to-four family residential	5,990				4,777
	Real estate construction and land development:
	One-to-four family residential	2,446				1,556
	Five or more family residential and commercial properties	3,560				—
	Total real estate construction and land development	6,006				1,556
	Consumer	8,971				3,740
	Gross covered loans receivable	126,200				63,754
	Allowance for loan losses	(5,576		)		(6,167		)
	Covered loans receivable, net	$	120,624			$	57,587
	At December 31, 2014 and December 31, 2013, the recorded investment balance of loans which are no longer covered under the FDIC shared-loss agreements, but are included in the covered loan table above as they are included in the loan pool established at the time of acquisition, was $872,000 and $2.6 million, respectively.
	(b) Credit Quality Indicators
	The following tables present the recorded invested balance of the covered loans receivable by credit quality indicator as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	11,297			$	131			$	5,442			$	2,240	$	19,110
	Owner-occupied commercial real estate	40,357				4,957				13,583				347		59,244
	Non-owner occupied commercial real estate	9,656				40				17,183				—		26,879
	Total commercial business	61,310				5,128				36,208				2,587		105,233
	One-to-four family residential	5,414				425				151						5,990
	Real estate construction and land development:
	One-to-four family residential	2,178				—				268				—		2,446
	Five or more family residential and commercial properties	1,758				—				1,802				—		3,560
	Total real estate construction and land development	3,936				—				2,070				—		6,006
	Consumer	7,030				—				1,941				—		8,971
	Gross covered loans receivable	$	77,690			$	5,553			$	40,370			$	2,587	$	126,200
		December 31, 2013
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	9,516			$	3,887			$	702			$	585	$	14,690
	Owner-occupied commercial real estate	21,084				2,318				708				256		24,366
	Non-owner occupied commercial real estate	6,534				55				4,631				3,405		14,625
	Total commercial business	37,134				6,260				6,041				4,246		53,681
	One-to-four family residential	3,739				882				156				—		4,777
	Real estate construction and land development:
	One-to-four family residential	698				—				858				—		1,556
	Five or more family residential and commercial properties	—				—				—				—		—
	Total real estate construction and land development	698				—				858				—		1,556
	Consumer	3,116				106				518				—		3,740
	Gross covered loans receivable	$	44,687			$	7,248			$	7,573			$	4,246	$	63,754
	(c) Nonaccrual Loans
	The recorded investment balance of covered nonaccrual loans, segregated by segments and classes of loans, were as follows as of December 31, 2014 and December 31, 2013:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,321			$	—
	Owner-occupied commercial real estate	1,132				—
	Non-owner-occupied commercial real estate	424				—
Total commercial business	3,877				—
Real estate construction and land development:
One-to-four family residential	179				—
Consumer	6				7
Gross covered nonaccrual loans	$	4,062			$	7
Covered PCI loans are not included in the nonaccrual table above because the loans are accounted for under ASC 310-30, whereby accretable yield is calculated based on a loan's expected cash flow even if the loan is not performing under its contractual terms.
(d) Past Due Loans
The balances of covered past due loans, segregated by segments and classes of loans, as of December 31, 2014 and December 31, 2013 were as follows:
	December 31, 2014
	30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
					Greater				Due								and  Still
																	Accruing (1)
	(In thousands)
Commercial business:
Commercial and industrial	$	2,262			$	1,163			$	3,425			$	15,685	$	19,110	$	—
Owner-occupied commercial real estate	645				2,680				3,325				55,919		59,244		—
Non-owner occupied commercial real estate	1,713				456				2,169				24,710		26,879		—
Total commercial business	4,620				4,299				8,919				96,314		105,233		—
One-to-four family residential	112				—				112				5,878		5,990		—
Real estate construction and land development:
One-to-four family residential	178				90				268				2,178		2,446		—
Five or more family residential and commercial properties	—				220				220				3,340		3,560		—
Total real estate construction and land development	178				310				488				5,518		6,006		—
Consumer	263				727				990				7,981		8,971		—
Gross covered loans receivable	$	5,173			$	5,336			$	10,509			$	115,691	$	126,200	$	—
-1	Excludes covered PCI loans.
	December 31, 2013
	30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
					Greater				Due								and  Still
																	Accruing (1)
	(In thousands)
Commercial business:
Commercial and industrial	$	726			$	1,156			$	1,882			$	12,808	$	14,690	$	—
Owner-occupied commercial real estate	28				147				175				24,191		24,366		—
Non-owner occupied commercial real estate	—				3,540				3,540				11,085		14,625		—
Total commercial business	754				4,843				5,597				48,084		53,681		—
One-to-four family residential	113				—				113				4,664		4,777		—
Real estate construction and land development:
One-to-four family residential	213				644				857				699		1,556		—
Five or more family residential and commercial properties	—				—				—				—		—		—
Total real estate construction and land development	213				644				857				699		1,556		—
Consumer	67				78				145				3,595		3,740		—
Gross covered loans receivable	$	1,147			$	5,565			$	6,712			$	57,042	$	63,754	$	—
-1	Excludes covered PCI loans.
(e) Impaired Loans
A covered loan, not initially classified as PCI, generally becomes impaired when classified as nonaccrual or when its modification results in a TDR. Covered impaired loans as of December 31, 2014 and December 31, 2013 are set forth in the following tables.
	December 31, 2014
	Recorded				Recorded				Total				Unpaid		Related
	Investment With				Investment With				Recorded				Contractual		Specific
	No Specific				Specific				Investment				Principal		Valuation
	Valuation				Valuation								Balance		Allowance
	Allowance				Allowance
	(In thousands)
Commercial business:
Commercial and industrial	$	2,240			$	94			$	2,334			$	3,696	$	9
Owner-occupied commercial real estate	—				1,132				1,132				1,156		295
Non-owner occupied commercial real estate	—				424				424				440		66
Total commercial business	2,240				1,650				3,890				5,292		370
Real estate construction and land development:
One-to-four family residential	—				179				179				182		51
Total real estate construction and land development	—				179				179				182		51
Consumer	—				6				6				8		2
Gross covered impaired loans	$	2,240			$	1,835			$	4,075			$	5,482	$	423
	December 31, 2013
	Recorded				Recorded				Total				Unpaid		Related
	Investment With				Investment With				Recorded				Contractual		Specific
	No Specific				Specific				Investment				Principal		Valuation
	Valuation				Valuation								Balance		Allowance
	Allowance				Allowance
	(In thousands)
Commercial business:
Commercial and industrial	$	10			$	3,751			$	3,761			$	3,761	$	629
Total commercial business	10				3,751				3,761				3,761		629
One-to-four family residential	—				450				450				423		31
Consumer	7				—				7				8		—
Gross covered impaired loans	$	17			$	4,201			$	4,218			$	4,192	$	660
The average recorded investment of covered impaired loans for the years ended December 31, 2014 and 2013 are set forth in the following table.
		Years Ended December 31,
		2014				2013				2012
		(In thousands)
Commercial business:
Commercial and industrial		$	3,421			$	1,484			$	21
Owner-occupied commercial real estate		367				—				—
Non-owner occupied commercial real estate		171				—				—
Total commercial business		3,959				1,484				21
One-to-four family residential		90				459				187
Real estate construction and land development:
One-to-four family residential		36				—				—
Total real estate construction and land development		36				—				—
Consumer		7				20				26
Gross covered impaired loans		$	4,092			$	1,963			$	234
For the years ended December 31, 2014, 2013 and 2012, no interest income was recognized subsequent to a covered loan’s classification as nonaccrual. For the years ended December 31, 2014, 2013 and 2012, the Bank recorded $5,000, $16,000 and $7,000, respectively, of interest income related to covered performing TDR loans.
(f) Troubled Debt Restructured Loans
The recorded investment balance and related allowance for loan losses of covered performing and covered nonaccrual TDRs as of December 31, 2014 and December 31, 2013 were as follows:
	December 31, 2014								December 31, 2013
	Performing				Nonaccrual				Performing				Nonaccrual
	TDRs				TDRs				TDRs				TDRs
	(In thousands)
Covered TDRs	$	10,289			$	2,246			$	4,211			$	7
Allowance for loan losses on covered TDRs	1				2				660				—
There were no unfunded commitments related to credits classified as covered TDRs at December 31, 2014 and December 31, 2013.
Covered loans that were modified as TDRs during the years ended December 31, 2014 and 2013 are set forth in the following table:
	Years Ended December 31,
	2014							2013
	Number of			Outstanding				Number of			Outstanding
	Contracts			Principal Balance				Contracts			Principal Balance
	-1			(1)(2)				-1			(1)(2)
	(Dollars in thousands)
Commercial business:
Commercial and industrial	7			$	3,394			3			$	3,792
Owner-occupied commercial real estate	2			1,133				—			—
Non-owner occupied commercial real estate	2			7,561				—			—
Total commercial business	11			12,088				3			3,792
One-to-four family residential	—			—				—			—
Real estate construction and land development:
One-to-four family residential	—			—				—			—
Five or more family residential and commercial properties	1			428				—			—
Total real estate construction and land development	1			428				—			—
Consumer	—			—				—			—
Total covered TDRs	12			$	12,516			3			$	3,792
-1	Number of contracts and outstanding principal balance represent loans which have balances as of year end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
-2	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bank’s recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification).
Of the twelve covered loans modified as TDRs during the year ended December 31, 2014, eleven loans totaling $10.3 million were related to PCI loans acquired in the Washington Banking Merger. There was no allowance for loan losses at December 31, 2014 on these modified loans as the recorded investment was less than the estimated net present value of future cash flows. Four of these modified loans totaling $7.7 million at December 31, 2014 were modified as a result of bankruptcy rulings and the courts dictated the future payment terms. One covered TDR totaling $2.2 million at December 31, 2014 was modified during both the years ended December 31, 2014 and 2013 because the loan's maturity date was extended in each modification. The Bank provided for a shorter maturity date than it expected to receive the cash flows to more closely monitor the borrower. At December 31, 2014, this loan did not have a specific valuation allowance as the loan had been charged-down to the net realizable value during fourth quarter 2014. The other two loans modified as TDRs during the year ended December 31, 2013 also had maturity date extensions. These two loans have outstanding principal balances of $13,000 and specific valuation of $1,000 at December 31, 2014.
There were no covered loans modified during the previous twelve months ended December 31, 2014 and December 31, 2013 that subsequently defaulted during the years ended December 31, 2014 and 2013.
(g) Covered Purchased Credit Impaired Loans
The Company acquired covered loans which the Bank accounts for under FASB ASC 310-30 as they were deemed PCI at the time of acquisition.
The following tables reflect the outstanding principal balance and recorded investment at December 31, 2014 and December 31, 2013 of the covered PCI loans:
	December 31, 2014								December 31, 2013
	Outstanding Principal				Recorded Investment				Outstanding Principal				Recorded Investment
	(In thousands)
Commercial business:
Commercial and industrial	$	9,635			$	7,134			$	10,608			$	8,680
Owner-occupied commercial real estate	23,071				20,666				11,538				10,923
Non-owner occupied commercial real estate	20,607				20,257				10,611				12,187
Total commercial business	53,313				48,057				32,757				31,790
One-to-four family residential	3,837				3,478				3,966				3,530
Real estate construction and land development:
One-to-four family residential	103				1,308				1,298				1,556
Five or more family residential and commercial properties	2,140				1,802				—				—
Total real estate construction and land development	2,243				3,110				1,298				1,556
Consumer	2,945				2,717				2,022				2,000
Gross covered PCI loans	$	62,338			$	57,362			$	40,043			$	38,876
The Bank has the option to modify covered PCI loans; however, modifying the loan may terminate the FDIC shared-loss coverage on those loans. At December 31, 2014 and December 31, 2013, the recorded investment balance of covered PCI loans which are no longer covered under the FDIC shared-loss agreements was $476,000 and $1.7 million, respectively. The Bank continues to report these loans in the covered portfolio as they are in a pool and they continue to be accounted for under FASB ASC 310-30. The FDIC indemnification asset has been adjusted to reflect the change in the loan status.
(h) Accretable Yield
The following table summarizes the accretable yield on the covered PCI loans resulting from the Cowlitz Acquisition and Washington Banking Merger for the years ended December 31, 2014, 2013 and 2012.
	Years Ended December 31,
	2014				2013				2012
	(In thousands)
Balance at the beginning of the year	$	9,535			$	14,286			$	19,912
Accretion	(3,749		)		(4,210		)		(6,679		)
Disposal and other	(1,718		)		(4,902		)		(1,140		)
Change in accretable yield (1)	4,452				4,361				2,193
Balance at the end of the year	$	8,520			$	9,535			$	14,286
-1	Includes accretable difference at acquisition.
On the May 1, 2014 merger date of the Washington Banking Merger, the contractual cash flows on covered PCI loans acquired in the Washington Banking Merger were $75.1 million and the expected cash flows were $52.2 million, resulting in a $22.9 million non-accretable difference. The fair value was estimated at $48.7 million, resulting in a $3.5 million accretable yield which is included in the table above as a change in accretable yield for the year ended December 31, 2014. The contractual cash flows on the covered non-PCI loans were $70.3 million and the expected cash flows were $66.5 million, resulting in $3.8 million of cash flows not expected to be collected. The fair value of the covered non-PCI loans acquired in the Washington Banking Merger at May 1, 2014 was $58.4 million.

Allowance_for_Loan_Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses
	The allowance for loan losses is maintained at a level deemed appropriate by management to provide for probable incurred credit losses in the loan portfolio.
	A summary of the changes in the noncovered loans’ allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 are as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	22,657		$	24,242		$	26,952
	Charge-offs	(3,643		)	(4,298		)	(6,017		)
	Recoveries of loans previously charged-off	907			929			1,737
	Provision for loan losses	2,232			1,784			1,570
	Balance at the end of the year	$	22,153		$	22,657		$	24,242
	A summary of the changes in the covered loans’ allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 are as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	6,167		$	4,352		$	3,963
	Charge-offs	(2,954		)	(73		)	(57		)
	Recoveries of loans previously charged-off	1			—			—
	Provision for loan losses	2,362			1,888			446
	Balance at the end of the year	$	5,576		$	6,167		$	4,352
	The covered loans acquired in the Cowlitz Acquisition and Washington Banking Merger (including Washington Banking's prior acquisitions of City Bank and North County Bank and related covered loans) are subject to the Company’s internal credit review. If and when credit deterioration occurs subsequent to the acquisition dates, a provision for loan losses will be charged to earnings for the full amount of the covered loan balance without regard to the FDIC shared-loss agreements. The portion of the estimated loss reimbursable from the FDIC is recorded in noninterest income and increases the FDIC indemnification asset.
	The following table details the activity in the allowance for loan losses for the year ended December 31, 2014 and the balance in the allowance for loan losses disaggregated on the basis of the Company’s impairment method as of December 31, 2014:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Allowance for loan losses for the year ended December 31, 2014:
	31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
	Charge-offs	(4,504		)	(337		)	(411		)	(31		)	(345		)	—			(969		)	—			(6,597		)
	Recoveries	716			—			—			7			43			—			142			—			908
	Provisions for loan losses	863			383			623			124			368			19			1,999			215			4,594
	31-Dec-14	$	10,553		$	4,095		$	5,538		$	1,200		$	1,786		$	972		$	2,769		$	816		$	27,729
	Allowance for loan losses as of December 31, 2014 allocated to:
	Noncovered loans individually evaluated for impairment	$	1,325		$	684		$	465		$	75		$	396		$	234		$	56		$	—		$	3,235
	Noncovered loans collectively evaluated for impairment	6,449			1,629			2,541			530			322			650			1,931			816			14,868
	Covered loans individually evaluated for impairment	9			295			66			—			51			—			2			—			423
	Covered loans collectively evaluated for impairment	108			14			6			8			—			—			12			—			148
	Noncovered PCI loans collectively evaluated for impairment	2,191			330			353			207			264			88			617			—			4,050
	Covered PCI loans collectively evaluated for impairment	471			1,143			2,107			380			753			—			151			—			5,005
	December 31, 2014	$	10,553		$	4,095		$	5,538		$	1,200		$	1,786		$	972		$	2,769		$	816		$	27,729
	The following table details the activity in the allowance for loan losses for the year ended December 31, 2013 and the balance in the allowance for loan losses disaggregated on the basis of the Company’s impairment method as of December 31, 2013:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Allowance for loan losses for the year ended December 31, 2013:
	31-Dec-12	$	9,912		$	4,021		$	5,369		$	1,221		$	3,131		$	2,309		$	1,761		$	870		$	28,594
	Charge-offs	(2,826		)	(247		)	—			(52		)	(423		)	(142		)	(681		)	—			(4,371		)
	Recoveries	248			560			—			—			—			32			89			—			929
	Provisions for / (reallocation of) loan losses	6,144			(285		)	(43		)	(69		)	(988		)	(1,246		)	428			(269		)	3,672
31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
Allowance for loan losses as of December 31, 2013 allocated to:
Noncovered loans individually evaluated for impairment	$	2,716		$	595		$	364		$	—		$	211		$	—		$	153		$	—		$	4,039
Noncovered loans collectively evaluated for impairment	6,727			2,101			2,516			570			429			855			575			601			14,374
Covered loans individually evaluated for impairment	629			—			—			31			—			—			—			—			660
Covered loans collectively evaluated for impairment	18			7			14			13			—			—			57			—			109
Noncovered PCI loans collectively evaluated for impairment	2,294			348			359			216			291			98			638			—			4,244
Covered PCI loans collectively evaluated for impairment	1,094			998			2,073			270			789			—			174			—			5,398
31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
The following table details the activity in the allowance for loan losses for the year ended December 31, 2012:
	Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
	and			occupied			occupied			family			construction			construction
	industrial			commercial			commercial			residential			and land			and land
				real estate			real estate						development:			development:
													one-to-four			five or more
													family			family
													residential			residential
																and
																commercial
																properties
	(In thousands)
Allowance for loan losses for the year ended December 31, 2012:
31-Dec-11	$	11,805		$	2,979		$	4,394		$	794		$	4,823		$	3,800		$	1,410		$	910		$	30,915
Charge-offs	(2,292		)	(1,142		)	(292		)	(391		)	(835		)	(445		)	(677		)	—			(6,074		)
Recoveries	1,560			8			11			—			125			—			33			—			1,737
Provisions for / (reallocation of) loan losses	(1,161		)	2,176			1,256			818			(982		)	(1,046		)	995			(40		)	2,016
31-Dec-12	$	9,912		$	4,021		$	5,369		$	1,221		$	3,131		$	2,309		$	1,761		$	870		$	28,594
The following table details the recorded investment balance of the loan receivables disaggregated on the basis of the Company’s impairment method as of December 31, 2014:
	Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Total
	and			occupied			occupied			family			construction			construction
	industrial			commercial			commercial			residential			and land			and land
				real estate			real estate						development:			development:
													one-to-four			five or more
													family			family
													residential			residential
																and
																commercial
																properties
	(In thousands)
Noncovered loans individually evaluated for impairment	$	9,040		$	2,781		$	7,305		$	245		$	4,524		$	2,056		$	205		$	26,156
Noncovered loans collectively evaluated for impairment	524,263			516,753			598,267			61,060			38,002			56,341			243,063			2,037,749
Covered loans individually evaluated for impairment	2,334			1,132			424			—			179			—			6			4,075
Covered loans collectively evaluated for impairment	9,642			37,446			6,198			2,512			959			1,758			6,248			64,763
Noncovered PCI loans collectively evaluated for impairment	18,040			16,208			11,185			2,235			4,223			2,963			7,055			61,909
Covered PCI loans collectively evaluated for impairment	7,134			20,666			20,257			3,478			1,308			1,802			2,717			57,362
Total gross loans receivable as of December 31, 2014	$	570,453		$	594,986		$	643,636		$	69,530		$	49,195		$	64,920		$	259,294		$	2,252,014
The following table details the recorded investment balance of the loan receivables disaggregated on the basis of the Company’s impairment method as of December 31, 2013:
	Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Total
	and			occupied			occupied			family			construction			construction
	industrial			commercial			commercial			residential			and land			and land
				real estate			real estate						development:			development:
													one-to-four			five or more
													family			family
													residential			residential
																and
																commercial
																properties
	(In thousands)
Noncovered loans individually evaluated for impairment	$	10,990		$	2,998		$	7,423		$	592		$	4,684		$	2,404		$	778		$	29,869
Noncovered loans collectively evaluated for impairment	308,771			273,192			385,771			38,722			15,008			44,894			38,592			1,104,950
Covered loans individually evaluated for impairment	3,761			—			—			450			—			—			7			4,218
Covered loans collectively evaluated for impairment	2,249			13,443			2,438			797			—			—			1,733			20,660
Noncovered PCI loans collectively evaluated for impairment	16,779			5,119			6,785			3,768			32			1,357			2,177			36,017
Covered PCI loans collectively evaluated for impairment	8,680			10,923			12,187			3,530			1,556			—			2,000			38,876
Total gross loans receivable as of December 31, 2013	$	351,230		$	305,675		$	414,604		$	47,859		$	21,280		$	48,655		$	45,287		$	1,234,590

FDIC_Indemnification_Asset

FDIC Indemnification Asset	12 Months Ended
	Dec. 31, 2014
FDIC Indemnification Asset [Abstract]
FDIC Indemnification Asset	FDIC Indemnification Asset
	Changes in the FDIC indemnification asset during the years ended December 31, 2014, 2013 and 2012 were as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	4,382		$	7,100		$	10,350
	Additions as a result of the Washington Banking Merger	7,174			—			—
	Cash payments received or receivable from the FDIC	(7,897		)	(2,537		)	(2,217		)
	Loan (recapture) impairment	(1,072		)	1,086			843
	Net amortization	(1,471		)	(1,267		)	(1,876		)
	Balance at the end of the year	$	1,116		$	4,382		$	7,100

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Other Real Estate Owned	Other Real Estate Owned
	Changes in other real estate owned during the years ended December 31, 2014, 2013 and 2012 were as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	4,559		$	5,666		$	4,484
	Additions	1,566			2,974			7,406
	Additions from acquisitions	7,121			2,279			—
	Proceeds from dispositions	(9,914		)	(6,253		)	(5,987		)
	Gain on sales, net	23			264			587
	Valuation adjustment	—			(371		)	(824		)
	Balance at the end of the year	$	3,355		$	4,559		$	5,666
	At December 31, 2014 and 2013, the balance of other real estate owned that was covered by shared-loss agreements were $1.2 million and $182,000, respectively.

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment
	A summary of premises and equipment is as follows:
		December 31, 2014		December 31, 2013
		(In thousands)
	Land	$	22,364	$	10,876
	Buildings and building improvements	52,067		33,482
	Furniture, fixtures and equipment	14,280		18,054
	Total premises and equipment	88,711		62,412
	Less accumulated depreciation	23,773		28,064
	Premises and equipment, net	$	64,938	$	34,348
	Total depreciation expense on premises and equipment was $3.5 million, $2.3 million and $2.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	(a) Goodwill
	The Company’s goodwill represents the excess of the purchase price over the fair value of net assets acquired in the Washington Banking Merger on May 1, 2014, and the acquisitions of Valley Community Bancshares, Inc. on July 15, 2013, Western Washington Bancorp in 2006 and North Pacific Bank in 1998. The Company’s goodwill is assigned to the Bank and is evaluated for impairment at the Bank level (reporting unit).
	The Company recorded additions of goodwill of $89.7 million during the year ended December 31, 2014 as a result of the Washington Banking Merger. The Company recorded additions to goodwill of $16.4 million during the year ended December 31, 2013 as a result of the Valley Acquisition. For additional information on the additions to goodwill, see "Note 2. Business Combinations."
	At December 31, 2014, the Company’s step-one analysis concluded that the reporting unit’s fair value was greater than its carrying value and therefore no goodwill impairment charges were required for the year ended December 31, 2014. The Company did not record any goodwill impairment charges for the years ended December 31, 2013 and 2012. Even though there was no goodwill impairment at December 31, 2014, adverse events may impact the recoverability of goodwill and could result in a future impairment charge which could have a material impact on the Company’s operating results.
	b) Other Intangible Assets
	The other intangible assets represent the core deposit intangible ("CDI") acquired in business combinations. The useful life of the CDI related to the Washington Banking Merger, the acquisitions of Valley, NCB, Pierce, Cowlitz, and Western Washington Bancorp were estimated to be ten, ten, five, four, nine and eight years, respectively.
	The following table presents the change in the other intangible assets for the periods indicated:
		Years Ended
		December 31,
		2014		2013		2012
		(In thousands)
	Balance at the beginning of the year	$	1,615	$	1,086	$	1,513
	Additions as a result of acquisitions	11,194		1,072		—
	Less: amortization expense	1,920		543		427
	Balance at the end of the year	$	10,889	$	1,615	$	1,086
	The estimated aggregated amortization expense related to these intangible assets for future years is as follows:
		Years Ending December 31,
		(In thousands)
	2015	$	2,072
	2016	1,443
	2017	1,285
	2018	1,122
	2019	1,043
	Thereafter	3,924
		$	10,889

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Deposits	Deposits
	Deposits consisted of the following:
			December 31, 2014				December 31, 2013
			Amount		Percent		Amount			Percent
			(Dollars in thousands)
	Noninterest demand deposits		$	709,673	24.4	%	$	349,902		25	%
	NOW accounts		793,362		27.3		352,051			25.2
	Money market accounts		520,065		17.9		232,016			16.6
	Savings accounts		357,834		12.3		155,790			11.1
	Total non-maturity deposits		2,380,934		81.9		1,089,759			77.9
	Certificate of deposit accounts		525,397		18.1		309,430			22.1
	Total deposits		$	2,906,331	100	%	$	1,399,189		100	%
	Accrued interest payable on deposits was $390,000 and $152,000 as of December 31, 2014 and 2013, respectively and is included in accrued expenses and other liabilities in the Consolidated Statements of Financial Condition.
	Interest expense, by category, is as follows:
			Years Ended December 31,
			2014		2013			2012
			(In thousands)
	NOW accounts		$	1,011	$	645		$	797
	Money market accounts		896		386			452
	Savings accounts		252		164			204
	Certificate of deposit accounts		2,991		2,478			3,016
			$	5,150	$	3,673		$	4,469
	Scheduled maturities of certificates of deposit for future years are as follows:
		Year Ending December 31,
		(In thousands)
	2015	$	347,895
	2016	107,849
	2017	35,254
	2018	13,887
	2019	19,883
	Thereafter	629
		$	525,397
	Certificates of deposit issued in denominations equal to or in excess of $250,000 totaled $79.8 million and $55.0 million as of December 31, 2014 and 2013, respectively.

Junior_Subordinated_Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Junior Subordinated Debentures	Junior Subordinated Debentures
	As part of the Washington Banking Merger, the Company assumed trust preferred securities and junior subordinated debentures with a total fair value of $18.9 million at May 1, 2014.
	Washington Banking Master Trust, a statutory business trust, was a wholly-owned subsidiary of Washington Banking Company created for the exclusive purposes of issuing and selling capital securities and utilizing sale proceeds to acquire junior subordinated debt issued by Washington Banking Company. During 2007, the Master Trust issued $25.0 million of trust preferred securities with a 30-year maturity, callable after the fifth year by Washington Banking Company (now callable by Heritage). The trust preferred securities have a quarterly adjustable rate based upon the three-month London Interbank Offered Rate (“LIBOR”) plus 1.56%. The rate at December 31, 2014 was 1.82%. The weighted average rate of the junior subordinated debentures was 3.59% for the year ended December 31, 2014 and included the accretion of the discount established at the merger date which is amortized over the life of the trust preferred securities.
	On the Washington Banking Merger date of May 1, 2014, the Company acquired the Washington Banking Master Trust. The Trust retained the Washington Banking Master Trust name.
	The junior subordinated debentures are the sole assets of the Master Trust, and payments under the junior subordinated debentures are the sole revenues of the Trust. All of the common securities of the Master Trust are owned by the Company. Heritage has fully and unconditionally guaranteed the capital securities along with all obligations of the Master Trust under the trust agreements.

Repurchase_Agreements

Repurchase Agreements	12 Months Ended
	Dec. 31, 2014
Repurchase Agreements [Abstract]
Repurchase Agreements	Repurchase Agreements
	The Company utilizes repurchase agreements with a one -day maturity as a supplement to funding sources. At December 31, 2014 and 2013 the Company had securities sold under agreement to repurchase of $32.2 million and $29.4 million, respectively. The weighted average interest rates on the utilized repurchased agreements was 0.26% and 0.27% as of December 31, 2014 and 2013, respectively. Repurchase agreements are secured by investment securities available for sale. Upon maturity of the agreements, the pledged investment securities will be returned to the Company.

Other_Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2014
Borrowing [Abstract]
Other Borrowings	Other Borrowings
	(a) FHLB Advances
	The Federal Home Loan Bank of Seattle functions as a member-owned cooperative providing credit for member financial institutions. Advances are made pursuant to several different programs. Each credit program has its own interest rate and range of maturities. Depending on the program, limitations on the amount of advances are based either on a fixed percentage of an institution’s net worth or on the FHLB’s assessment of the institution’s creditworthiness. At December 31, 2014, the Bank maintained a credit facility with the FHLB of Seattle for $374.3 million. During the years ended December 31, 2014 and 2013, there were no FHLB borrowing transactions completed other than minimal amounts necessary to test the facilities. At December 31, 2014 and 2013 there were no FHLB advances outstanding.
	Advances from the FHLB are collateralized by a blanket pledge on FHLB stock owned by the Bank, deposits at the FHLB and all mortgages or deeds of trust securing such properties. In accordance with the pledge agreement, the Company must maintain unencumbered collateral in an amount equal to varying percentages ranging from 100% to 125% of outstanding advances depending on the type of collateral. At December 31, 2014, the Bank was not required to maintain collateral in order to meet the collateral requirements of the FHLB.
	(b) Federal Funds Purchased
	The Bank maintains advance lines with Zions Bank, Wells Fargo Bank, US Bank and Pacific Coast Bankers’ Bank to purchase federal funds of up to $43.0 million as of December 31, 2014. The lines generally mature annually or are reviewed annually. As of December 31, 2014 and 2013, there were no federal funds purchased.
	(c) Credit facilities
	The Bank maintains a credit facility with the Federal Reserve Bank of San Francisco for $53.2 million as of December 31, 2014, of which there were no borrowings outstanding as of December 31, 2014 or 2013. Any advances on the credit facility would have to be first pledged with the Bank's investment securities or loans.

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2014
Employee Benefits and Share-based Compensation [Abstract]
Employee Benefits	Employee Benefit Plans
	(a) 401(k) Plan
	Effective October 1, 1999, the Company combined three retirement plans, a money purchase pension plan, a 401(k) plan, and an employee stock ownership plan ("ESOP") at Heritage Bank, and the 401(k) plan at Central Valley Bank into one plan called the "Heritage Financial Corporation 401(k) Employee Stock Ownership Plan" (the “Plan”). In 2010, the Company amended the Plan to provide certain service credit for vesting and/or contribution purposes to employees of Cowlitz Bank and Pierce Commercial Bank at the time of each acquisition. Effective January 1, 2014, the Plan converted from an ESOP to a profit sharing plan and changed its name to "Heritage Financial Corporation 401(k) Profit Sharing Plan and Trust."
	The profit sharing portion of the Plan is a defined contribution retirement plan. Effective January 1, 2014, the Company changed the contribution formula to make all profit sharing and discretionary contributions completely discretionary. For the year ended December 31, 2014, the Company contributed 1.5% of employees' eligible compensation. For the Plan years 2013 and 2012, the Company was required to contribute 2% of the participants’ eligible compensation and it could also provide discretionary profit sharing contributions beyond the required 2% contribution. For the years ended December 31, 2013 and 2012, the Company contributed 3% of employees' eligible compensation. Participants were eligible for profit sharing contributions upon credit of 1,000 hours of service during the plan year, the attainment of 18 years of age, and employment on the last day of the year. It was the Company’s policy to fund plan costs as accrued. Historically, employee vesting in the profit sharing contribution occurred over a period of six years, at which time they became fully vested. All participants employed at May 1, 2014 became 100% vested in all employer contributions. All participants hired after May 1, 2014 are 100% vested in all accounts at all times. Employer profit sharing contributions were $475,000, $600,000 and $631,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	The Plan also includes the Company’s salary savings 401(k) plan for its employees. All persons employed as of July 1, 1984 automatically participate in the plan. All employees hired after that date who are at least 18 years of age may participate in the plan the first of the month following thirty days of service. Employees who participate may contribute a portion of their salary, which is matched by the employer at 50%, not to be greater than 3% of eligible compensation, up to certain Internal Revenue Service limits. Employee vesting in employer matching is consistent with the vesting periods discussed in the profit sharing portion above. Employer matching contributions for the years ended December 31, 2014, 2013 and 2012 were $852,000, $497,000 and $444,000, respectively.
	The third portion of the Plan was the ESOP. Heritage Bank established the ESOP and related trust for eligible employees effective July 1, 1994, which became active upon the former mutual holding company’s conversion to a stock-based holding company in January 1995. The ESOP provided a contribution to all eligible participants upon completion of one year of service, the attainment of 18 years of age, and employment on the last day of the year. Employee vesting in the ESOP is consistent with the vesting periods discussed in the profit sharing portion above. The ESOP was funded by employer contributions in cash or common stock. During the year ended December 31, 2012, the loan related to the ESOP was paid in full; therefore, there was no ESOP compensation expense for the years ended December 31, 2014 and 2013. ESOP compensation expense was $139,000 for the year ended December 31, 2012. As of December 31, 2014 and 2013, the Company had no allocated or committed shares to be released to the ESOP, and the Company has no unearned, restricted shares remaining to be released as of December 31, 2014.
	(b) Employment Agreements
	The Company has entered into contracts with certain senior officers that provide benefits under certain conditions following termination without cause, and/or following a change in control of the Company.
	(c) Deferred Compensation Plan
	During 2012, the Company adopted a Deferred Compensation Plan, which provides its directors and select executive officers with the opportunity to defer current compensation. Under the Plan, participants are permitted to elect to defer compensation and the Company has the discretion to make additional contributions to the Plan on behalf of any participant based on a number of factors. Compensation expense under the Deferred Compensation Plan totaled $343,000, $445,000 and $312,000 for the years ended December 31, 2014, 2013 and 2012, respectively. The Company’s contributions totaled $414,000, $155,000 and $150,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	(d) Split-Dollar Life Insurance Benefit Plan
	In conjunction with the Washington Banking Merger, the Company assumed the split-dollar life insurance benefit plan previously maintained by Washington Banking. Life insurance policies are maintained for current officers of the Bank or former Washington Banking officers that are subject to split-dollar life insurance agreements, which continue after the participant's employment and retirement. All participants are fully vested in their split-dollar life insurance benefits. The accrued benefit liability for the split-dollar life insurance agreements represents the present value of the future death benefits payable to the participants' beneficiaries.
	The split-dollar life insurance projected benefit obligation is included in accrued expenses and other liabilities on the Company's Consolidated Statements of Financial Condition. As of December 31, 2014, the carrying value of the obligation was $1.2 million. The Company had no obligation at December 31, 2013.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	(a) Lease Commitments
	The Bank leases premises and equipment under operating leases. Rental expense of leased premises and equipment was $3.4 million, $2.3 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively, which is included in occupancy and equipment expense.
	The estimated future minimum annual rental commitments under noncancelable leases having an original or remaining term of more than one year are as follows:
		Years Ending December 31,
		(In thousands)
	2015	$	3,307
	2016	2,984
	2017	2,741
	2018	2,276
	2019	1,504
	Thereafter	3,723
		$	16,535
	Certain leases contain renewal options from two to ten years and escalation clauses based on increases in property taxes and other costs.
	(b) Commitments to Extend Credit
	In the ordinary course of business, the Company may enter into various types of transactions that include commitments to extend credit that are not included in the Consolidated Financial Statements. The Company applies the same credit standards to these commitments as it uses in all its lending activities and has included these commitments in its lending risk evaluations. The Company’s exposure to credit loss under commitments to extend credit is represented by the amount of these commitments.
	The following table presents outstanding commitments to extend credit, including letters of credit, at the dates indicated:
			December 31, 2014		December 31, 2013
			(In thousands)
	Commercial business:
	Commercial and industrial		$	288,930	$	169,079
	Owner-occupied commercial real estate		2,648		2,812
	Non-owner occupied commercial real estate		20,240		2,405
	Total commercial business		311,818		174,296
	One-to-four family residential		—		45
	Real estate construction and land development:
	One-to-four family residential		24,028		12,236
	Five or more family residential and commercial properties		32,653		20,720
	Total real estate construction and land development		56,681		32,956
	Consumer		122,633		27,480
	Total outstanding commitments		$	491,132	$	234,777
	(c) Regulatory and Legal Proceedings
	The Company is involved in numerous business transactions, which, in some cases, depend on regulatory determination as to compliance with rules and regulations. Also, the Company has certain litigation and negotiations in progress. All such matters are attributable to activities arising from normal operations, except the matter related to the class action lawsuit mentioned below. In the opinion of management, after review with legal counsel, the eventual outcome of the aforementioned matters, including the class action lawsuit mentioned below, is unlikely to have a materially adverse effect on the Company’s Consolidated Financial Statements or its financial position.
	On April 4, 2014, Washington Banking, its directors and Heritage entered into and documented an agreement in principle among Washington Banking, its directors, Heritage and the plaintiffs for the settlement of the putative shareholder class action lawsuit captioned In Re Washington Banking Company Shareholder Litigation, Lead Case No. 13-2-38689-5 SEA, pending before the Superior Court of the State of Washington in and for King County (the “Action”).  The Action alleges that Washington Banking’s directors breached their fiduciary duties to Washington Banking and its shareholders in connection with the transactions contemplated by the Agreement and Plan of Merger, dated October 23, 2013 (the “Merger Agreement”), under which Washington Banking and Heritage combined their organizations in a strategic combination, with Washington Banking merging with and into Heritage. The Action also alleges, among other things, that Heritage aided and abetted the alleged breaches of fiduciary duties by Washington Banking's directors and that the public disclosures concerning the Washington Banking Merger are misleading in various respects.
	On December 15, 2014, the Court entered an order preliminarily approving the settlement of the consolidated litigation and ordering WBCO to provide notice of the proposed settlement to those persons who held WBCO shares during the purported class period.
	On February 27, 2015, the Court held a hearing to consider whether the settlement was fair and reasonable to the class members and, if so, to approve the settlement and to consider plaintiffs’ counsel’s application for an award of attorneys’ fees and costs from Washington Banking.  At the hearing, the Court approved the settlement and entered a Final Judgment and Order of Dismissal With Prejudice awarding plaintiffs’ counsel fees and expenses totaling $450,000 and terminating the litigation.
	The settlement of the Action did not affect the Washington Banking Merger consideration paid to Washington Banking’s shareholders in connection with the completion of the Washington Banking Merger on May 1, 2014.  Washington Banking, its directors and Heritage took the position that the Action was without merit and denied any wrongdoing of any kind.  Washington Banking, its directors and Heritage entered into the settlement solely to eliminate the costs, risks, burden, distraction and expense of further litigation and to put the claims that were or could have been asserted to rest.  Nothing in the stipulation of settlement or any public filing, including this Annual Report on Form 10-K, shall be deemed an admission of the legal necessity of filing or the materiality under applicable laws of any of the additional information contained herein or in any public filing associated with the settlement of the Action.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity
	(a) Earnings Per Common Share
	The following table illustrates the reconciliation of weighted average shares used for earnings per common share computations for the years ended December 31, 2014, 2013 and 2012:
		Years Ended
		December 31,
		2014				2013			2012
		(Dollars in thousands)
	Net income:
	Net income	$	21,014			$	9,575		$	13,261
	Less: Dividends and undistributed earnings allocated to participating securities	(163		)		(118		)	(162		)
	Net income allocated to common stockholders	$	20,851			$	9,457		$	13,099
	Basic:
	Weighted average common shares outstanding	25,641,229				15,667,912			15,262,452
	Less: Restricted stock awards	(210,690		)		(191,677		)	(182,303		)
	Total basic weighted average common shares outstanding	25,430,539				15,476,235			15,080,149
	Diluted:
	Basic weighted average common shares outstanding	25,430,539				15,476,235			15,080,149
	Incremental shares from stock options	46,750				11,480			14,640
	Total diluted weighted average common shares outstanding	25,477,289				15,487,715			15,094,789
	Potential dilutive shares are excluded from the computation of earnings per share if their effect is anti-dilutive. For the years ended December 31, 2014, 2013 and 2012 anti-dilutive shares outstanding related to options to acquire common stock totaled 20,768, 163,863 and 249,215, respectively, as the assumed proceeds from exercise price, tax benefits and future compensation was in excess of the market value.
	(b) Dividends
	The timing and amount of cash dividends paid on the Company's common stock depends on the Company’s earnings, capital requirements, financial condition and other relevant factors. Dividends on common stock from the Company depend substantially upon receipt of dividends from the Bank, which is the Company’s predominant source of income. The following table summarizes the dividend activity for the years ended December 31, 2014, 2013 and 2012.
	Declared		Cash Dividend per Share		Record Date		Paid Date
	1-Feb-12		$0.06		10-Feb-12		24-Feb-12
	26-Apr-12		$0.08		10-May-12		24-May-12
	26-Jun-12		$0.20		10-Jul-12		24-Jul-12
	25-Jul-12		$0.08		14-Aug-12		24-Aug-12
	30-Oct-12		$0.08		9-Nov-12		21-Nov-12
	30-Nov-12		$0.30		26-Nov-12		6-Dec-12
	January 30, 2013		$0.08		February 8, 2013		February 22, 2013
	April 24, 2013		$0.08		May 10, 2013		May 24, 2013
	July 23, 2013		$0.18		August 6, 2013		August 15, 2013
	October 23, 2013		$0.08		November 5, 2013		November 15, 2013
	29-Jan-14		$0.08		February 10, 2014		February 24, 2014
	27-Mar-14		$0.08		April 8, 2014		April 23, 2014
	July 24, 2014		$0.09		August 7, 2014		August 21, 2014
	October 23, 2014		$0.09		November 6, 2014		November 20, 2014
	November 11, 2014		$0.16		December 2, 2014		December 12, 2014
	The FDIC and the Washington State Department of Financial Institutions, Division of Banks have the authority under their supervisory powers to prohibit the payment of dividends by the Bank to the Company. Additionally, current guidance from the Board of Governors of the Federal Reserve System ("Federal Reserve Board") provides, among other things, that dividends per share on the Company’s common stock generally should not exceed earnings per share, measured over the previous four fiscal quarters. Current regulations allow the Company and the Bank to pay dividends on their common stock if the Company’s or the Bank’s regulatory capital would not be reduced below the statutory capital requirements set by the Federal Reserve Board and the FDIC.
	(c) Stock Repurchase Program
	The Company has had various stock repurchase programs since March 1999. On October 23, 2014, the Company's Board of Directors authorized the repurchase of up to 5% of the Company's outstanding common shares, or approximately 1,513,000 shares, under the eleventh stock repurchase plan. The number, timing and price of shares repurchased will depend on business and market conditions, and other factors, including opportunities to deploy the Company's capital. The Company will not repurchase the remaining 52,025 shares available under the tenth plan described below as the eleventh plan supersedes the tenth stock repurchase program.
	On August 30, 2012, the Board of Directors approved the Company’s tenth stock repurchase plan, authorizing the repurchase of up to 5% of the Company’s outstanding shares of common stock, or approximately 757,000 shares. On August 30, 2011, the Board of Director approved the Company's ninth stock repurchase plan, authorizing the repurchase of up to 5% of the Company's outstanding shares of common stock, or approximately 782,000 shares over a period of twelve months.
	The following table provides total repurchased shares and average share prices under the applicable Plans and years indicated:
		Years Ended December 31,
		2014				2013			2012			Plan Total
	Ninth Plan
	Repurchased shares	—				—			389,627			590,832
	Stock repurchase average share price	$	—			$	—		$	13.45		$	12.83
	Tenth Plan
	Repurchased shares	108,075				544,000			52,900			704,975
	Stock repurchase average share price	$	16.68			$	15.88		$	13.88		$	15.85
	Eleventh Plan
	Repurchased shares	—				—			—			—
	Stock repurchase average share price	$	—			$	—		$	—		$	—
	During the years ended December 31, 2014, 2013 and 2012, the Company repurchased 48,304, 13,138 and 3,419 shares at an average price of $16.53, $14.29 and $14.08 to pay withholding taxes on the vesting of restricted stock that vested during the years ended December 31, 2014, 2013 and 2012, respectively, which are not considered repurchased as part of the applicable Plans.
	(d) Issuance of Common Stock
	The Washington Banking Merger was effective on May 1, 2014. In conjunction with the merger was the issuance of 14,000,178 shares of the Company's common stock at a fair value of $226.2 million. The Valley Acquisition was effective on July 15, 2013. In conjunction with this acquisition was the issuance of 1,533,267 shares of the Company's stock at a fair value of $24.2 million.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	The changes in accumulated other comprehensive income (loss) (“AOCI”) by component, during the years ended December 31, 2014, 2013 and 2012 are as follows:
		Year ended December 31, 2014
		Changes in			Accretion of other-than-			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	(923	)	$	(239	)	$	(1,162	)
	Other comprehensive income before reclassification	4,676			50			4,726
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	(186		)	—			(186		)
	Net current period other comprehensive income	4,490			50			4,540
	Balance of AOCI at the end of the year	$	3,567		$	(189	)	$	3,378
	-1	All amounts are net of tax.
		Year ended December 31, 2013
		Changes in			Accretion of other-than-			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	2,042		$	(298	)	$	1,744
	Other comprehensive (loss) income before reclassification	(2,965		)	59			(2,906		)
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	—			—			—
	Net current period other comprehensive (loss) income	(2,965		)	59			(2,906		)
	Balance of AOCI at the end of the year	$	(923	)	$	(239	)	$	(1,162	)
	-1	All amounts are net of tax.
		Year ended December 31, 2012
		Changes in			Accretion of other-than-			Other-than-temporary impairments on securities held to maturity (1)			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	2,105		$	(369	)	$	—		$	1,736
	Other comprehensive (loss) income before reclassification	(63		)	105			(34		)	8
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	—			—			—			—
	Net current period other comprehensive (loss) income	(63		)	105			(34		)	8
	Balance of AOCI at the end of the year	$	2,042		$	(264	)	$	(34	)	$	1,744
	-1	All amounts are net of tax.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values:
	Level 1: Valuations for assets and liabilities traded in active exchange markets, or interest in open-end mutual funds that allow the Company to sell its ownership interest back to the fund at net asset value on a daily basis. Valuations are obtained from readily available pricing sources for market transactions involving identical assets, liabilities, or funds.
	Level 2: Valuations for assets and liabilities traded in less active dealer, or broker markets, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or valuations using methodologies with observable inputs.
	Level 3: Valuations for assets and liabilities that are derived from other valuation methodologies, such as option pricing models, discounted cash flow models and similar techniques using unobservable inputs, and not based on market exchange, dealer, or broker traded transactions. Level 3 valuations incorporate certain assumptions and projections in determining the fair value assigned to such assets or liabilities.
	(a) Recurring and Nonrecurring Basis
	The Company used the following methods and significant assumptions to estimate fair value of certain assets on a recurring and nonrecurring basis:
	Investment Securities Available for Sale and Held to Maturity:
	The fair values of all investment securities are based upon the assumptions market participants would use in pricing the security. If available, investment securities are determined by quoted market prices which is generally the case for mutual funds and other equities (Level 1). For investment securities where quoted market prices are not available, fair values are calculated based on market prices on similar securities (Level 2). Level 2 includes U.S. Treasury, U.S. government and agency debt securities, municipal securities, corporate securities and mortgage-backed securities and collateralized mortgage obligations-residential. For investment securities where quoted prices or market prices of similar securities are not available, fair values are calculated by using observable and unobservable inputs such as discounted cash flows or other market indicators (Level 3). Security valuations are obtained from third party pricing services for comparable assets or liabilities.
	Impaired Loans:
	At the time a loan is considered impaired, its impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or fair market value of the collateral if the loan is collateral-dependent. Impaired loans for which impairment is measured using the discounted cash flow approach are not considered to be measured at fair value because the loan’s effective interest rate is not a fair value input, and for the purposes of fair value disclosures, the fair value of these loans are measured commensurate with non-impaired loans. Generally, the Company utilizes the fair market value of the collateral, which is commonly based on recent real estate appraisals, to measure impairment. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business (Level 3). Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted accordingly.
	Other Real Estate Owned:
	Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in Level 3 classification of the inputs for determining fair value.
	Appraisals for both collateral-dependent impaired loans and other real estate owned are performed by certified general appraisers for commercial properties or certified residential appraisers for residential properties whose qualifications and licenses have been reviewed and verified by the Company. Once received, the Company reviews the assumptions and approaches utilized in the appraisal as well as the resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. On a quarterly basis, the Company compares the actual selling price of collateral that has been liquidated to the most recent appraised value to determine what additional adjustment should be made to the appraisal value to arrive at fair value.
	The following tables summarize the balances of assets measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Total		Level 1			Level 2		Level 3
		(In thousands)
	Investment securities available for sale:
	U.S. Treasury and U.S. Government-sponsored agencies	$	21,427	$	—		$	21,427	$	—
	Municipal securities	173,037		—			173,037		—
	Mortgage backed securities and collateralized mortgage obligations—residential:
	U.S Government-sponsored agencies	542,399		—			542,399		—
	Corporate obligations	4,010		—			4,010		—
	Mutual funds and other equities	1,973		1,973			—		—
	Total	$	742,846	$	1,973		$	740,873	$	—
		December 31, 2013
		Total		Level 1			Level 2		Level 3
		(In thousands)
	Investment securities available for sale:
	U.S. Treasury and U.S. Government-sponsored agencies	$	6,039	$	—		$	6,039	$	—
	Municipal securities	49,060		—			49,060		—
	Mortgage backed securities and collateralized mortgage obligations—residential:
	U.S Government-sponsored agencies	108,035		—			108,035		—
	Total	$	163,134	$	—		$	163,134	$	—
	There were no transfers between Level 1 and Level 2 during the years ended December 31, 2014, 2013 and 2012.
	The Company may be required to measure certain financial assets and liabilities at fair value on a nonrecurring basis. These adjustments to fair value usually result from application of lower-of-cost-or-market accounting or write-downs of individual assets.
	The tables below represent assets measured at fair value on a nonrecurring basis at December 31, 2014 and December 31, 2013 and the net losses (gains) recorded in earnings during years ended December 31, 2014 and 2013.
		Basis (1)		Fair Value at December 31, 2014
				Total			Level 1		Level 2		Level 3		Net Losses
													(Gains)
													Recorded in
													Earnings
													During
													the Year Ended December 31, 2014
		(In thousands)
	Noncovered impaired loans:
	Commercial business:
	Commercial and industrial	$	161	$	138		$	—	$	—	$	138	$	23
	Total commercial business	161		138			—		—		138		23
	Real estate construction and land development:
	One-to-four family residential	2,094		1,725			—		—		1,725		350
	Total real estate construction and land development	2,094		1,725			—		—		1,725		350
	Consumer	49		45			—		—		45		5
	Total noncovered impaired loans	2,304		1,908			—		—		1,908		378
	Investment securities held to maturity:
	Mortgage back securities and collateralized mortgage obligations—residential:
	Private residential collateralized mortgage obligations	36		11			—		11		—		45
	Total	$	2,340	$	1,919		$	—	$	11	$	1,908	$	423
	-1	Basis represents the unpaid principal balance of noncovered impaired loans and amortized cost of investment securities held to maturity.
		Basis (1)		Fair Value at December 31, 2013
				Total			Level 1		Level 2		Level 3		Net Losses
													(Gains)
													Recorded in
Earnings
During
the Year Ended December 31, 2013
	(In thousands)
Noncovered impaired loans:
Commercial business:
Commercial and industrial	$	4,850	$	2,134		$	—	$	—	$	2,134	$	1,681
Owner-occupied commercial real estate	1,880		1,285			—		—		1,285		594
Non-owner occupied commercial real estate	4,123		3,759			—		—		3,759		(2,409		)
Total commercial business	10,853		7,178			—		—		7,178		(134		)
One-to-four family residential	—		—			—		—		—		—
Real estate construction and land development:
One-to-four family residential	911		700			—		—		700		211
Total real estate construction and land development	911		700			—		—		700		211
Consumer	678		525			—		—		525		153
Total noncovered impaired loans	12,442		8,403			—		—		8,403		230
Covered impaired loans:
Commercial business:
Commercial and industrial	3,751		3,122			—		—		3,122		628
Non-owner occupied commercial real estate	—		—			—		—		—		—
Total commercial business	3,751		3,122			—		—		3,122		628
One-to-four family residential	450		419			—		—		419		(13		)
Consumer	—		—			—		—		—		(2		)
Total covered impaired loans	4,201		3,541			—		—		3,541		613
Investment securities held to maturity:
Mortgage back securities and collateralized mortgage obligations – residential:
Private residential collateralized mortgage obligations	19		19			—		19		—		38
Other real estate owned:
Commercial properties	1,720		1,222			—		—		1,222		348
Total	$	18,382	$	13,185		$	—	$	19	$	13,166	$	1,229
-1	Basis represents the unpaid principal balance of noncovered impaired and covered impaired loans, amortized cost of investment securities held to maturity, and carrying value at ownership date of other real estate owned.
The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2014 and December 31, 2013.
	December 31, 2014
	Fair		Valuation		Unobservable Input(s)	Range of Inputs; Weighted
	Value		Technique(s)			Average
	(Dollars in thousands)
Noncovered impaired loans	$	1,908	Market approach		Adjustment for differences between the comparable sales	(47.5%) - 96.2%; 7.0%
	December 31, 2013
	Fair		Valuation		Unobservable Input(s)	Range of Inputs; Weighted
	Value		Technique(s)			Average
	(Dollars in thousands)
Noncovered impaired loans	$	8,403	Market approach		Adjustment for differences between the comparable sales	(27.8%) - 19.1%; (6.6%)
Covered impaired loans	$	3,541	Market approach		Adjustment for differences between the comparable sales	(50.0%) - (25.0%); (35.0%)
Other real estate owned	$	1,222	Market approach		Adjustment for differences between the comparable sales	(60.1)% - 13.6%; (35.2%)
(b) Fair Value of Financial Instruments
Because broadly traded markets do not exist for most of the Company’s financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. These determinations are subjective in nature, involve uncertainties and matters of significant judgment and do not include tax ramifications; therefore, the results cannot be determined with precision, substantiated by comparison to independent markets and may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein do not represent, and should not be construed to represent, the underlying value of the Company.
The tables below present the carrying value amount of the Company’s financial instruments and their corresponding estimated fair values at the dates indicated.
	December 31, 2014
	Carrying Value		Fair Value			Fair Value Measurements Using:
						Level 1		Level 2		Level 3
	(In thousands)
Financial Assets:
Cash and cash equivalents	$	121,636	$	121,636		$	121,636	$	—	$	—
Other interest earning deposits	10,126		10,145			—		10,145		—
Investment securities available for sale	742,846		742,846			1,973		740,873		—
Investment securities held to maturity	35,814		36,874			—		36,874		—
Federal Home Loan Bank stock	12,188		N/A			N/A		N/A		N/A
Loans held for sale	5,582		5,710			—		5,710		—
Loans receivable, net of allowance for loan losses	2,223,348		2,279,081			—		—		2,279,081
Accrued interest receivable	9,836		9,836			3		3,009		6,824
Financial Liabilities:
Deposits:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	$	2,380,934	$	2,380,934		$	2,380,934	$	—	$	—
Certificate of deposit accounts	525,397		525,768			—		525,768		—
Total deposits	$	2,906,331	$	2,906,702		$	2,380,934	$	525,768	$	—
Securities sold under agreement to repurchase	$	32,181	$	32,181		$	32,181	$	—	$	—
Junior subordinated debentures	19,082		19,082			—		—		19,082
Accrued interest payable	411		411			62		328		21
	December 31, 2013
	Carrying Value		Fair Value			Fair Value Measurements Using:
						Level 1		Level 2		Level 3
	(In thousands)
Financial Assets:
Cash and cash equivalents	$	130,400	$	130,400		$	130,400	$	—	$	—
Other interest earning deposits	15,662		15,747			—		15,747		—
Investment securities available for sale	163,134		163,134			—		163,134		—
Investment securities held to maturity	36,154		36,340			—		36,340		—
Federal Home Loan Bank stock	5,741		N/A			N/A		N/A		N/A
Loans receivable, net of allowance	1,203,096		1,218,192			—		—		1,218,192
Accrued interest receivable	5,462		5,462			26		910		4,526
Financial Liabilities:
Deposits:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	$	1,089,759	$	1,089,759		$	1,089,759	$	—	$	—
Certificate of deposit accounts	309,430		311,065			—		311,065		—
Total deposits	$	1,399,189	$	1,400,824		$	1,089,759	$	311,065	$	—
Securities sold under agreement to repurchase	$	29,420	$	29,420		$	29,420	$	—	$	—
Accrued interest payable	152		152			17		135		—
The methods and assumptions, not previously presented, used to estimate fair value are described as follows:
Cash and Cash Equivalents:
The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value equal to carrying value (Level 1).
Other Interest Earning Deposits:
These deposits with other banks have maturities greater than three months. The fair value is calculated based upon market prices for similar deposits (Level 2).
Federal Home Loan Bank ("FHLB") Stock:
FHLB of Seattle stock is not publicly traded, as such, it is not practicable to determine the fair value of FHLB stock due to restrictions placed on its transferability.
Loans Held for Sale:
The fair value of loans held for sale is estimated based upon binding contracts or quotes from third party investors. (Level 2).
Loans Receivable:
Except for impaired loans discussed previously, fair value is based on discounted cash flows using current market rates applied to the estimated life (Level 3). While these methodologies are permitted under U.S. GAAP, they are not based on the exit price concept of the fair value required under ASC 820-10, Fair Value Measurements and Disclosures, and generally produce a higher value.
Accrued Interest Receivable/Payable:
The fair value of accrued interest receivable/payable balances are determined using inputs and fair value measurements commensurate with the asset or liability from which the accrued interest is generated. The carrying amounts of accrued interest approximate fair value (Level 1, Level 2 and Level 3).
Deposits:
For deposits with no contractual maturity, the fair value is assumed to equal the carrying value (Level 1). The fair value of fixed maturity deposits is based on discounted cash flows using the difference between the deposit rate and the rates offered by the Company for deposits of similar remaining maturities (Level 2).
Securities Sold Under Agreement to Repurchase:
Securities sold under agreement to repurchase are short-term in nature, repricing on a daily basis. Fair value financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value equal to carrying value (Level 1).
Junior Subordinated Debentures:
The fair value is estimated using discounted cash flow analysis based on current rates for similar types of debt, which many be unobservable, and considering recent trading activity of similar instrument in markets which can be inactive. At December 31, 2014, the fair value approximated the carrying value based on these valuation techniques (Level 3).
Off-Balance Sheet Financial Instruments:
The majority of our commitments to extend credit, standby letters of credit and commitments to sell mortgage loans carry current market interest rates if converted to loans. As such, no premium or discount was ascribed to these commitments (Level 1). They are excluded from the preceding tables.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	Stock options generally vest ratably over three years and expire five years after they become exercisable or vest ratably over four years and expire ten years from date of grant. Restricted stock awards issued generally have a five-year cliff vesting or four year ratable vesting schedule. The Company issues new shares of common stock to satisfy share option exercises and restricted stock awards.
	On July 24, 2014, the Company's shareholders approved the Heritage Financial Corporation 2014 Omnibus Equity Plan (the "Plan") under which 1,500,000 shares of the Company's common stock may be issued in the form of nonqualified stock option awards, restricted stock awards and restricted stock unit awards.
	As of December 31, 2014, 1,384,105 shares remain available for future issuances under the Plan.
	(a) Stock Option Awards
	For the years ended December 31, 2014, 2013 and 2012 the Company recognized compensation expense related to stock options of $20,000, $71,000 and $106,000, respectively, with related tax benefits of $0, $0 and $1,000, respectively. As of December 31, 2014, all of the compensation expense related to the outstanding stock options had been recognized. The intrinsic value from options exercised during the years ended December 31, 2014, 2013 and 2012 were $459,000, $54,000 and $31,000, respectively. The cash proceeds from options exercised during the years ended December 31, 2014, 2013 and 2012 were $915,000, $200,000, and $129,000, respectively.
	The following tables summarize the stock option activity for the years ended December 31, 2014, 2013 and 2012:
		Shares		Weighted-Average Exercise Price		Weighted-Average	Aggregate
						Remaining	Intrinsic
						Contractual	Value (In
						Term (In years)	thousands)
	Outstanding at December 31, 2011	417,123		$	18.33
	Granted	—		—
	Exercised	(11,365	)	11.35
	Forfeited or expired	(105,100	)	21.52
	Outstanding at December 31, 2012	300,658		17.48
	Granted	—		—
	Exercised	(16,553	)	12.1
	Forfeited or expired	(89,623	)	22.07
	Outstanding at December 31, 2013	194,482		15.82
	Granted (1)	90,248		10.72
	Exercised	(84,189	)	10.86
	Forfeited or expired	(44,134	)	22.76
	Outstanding at December 31, 2014	156,407		$	13.59	2.63	$	647
	Vested and expected to vest at December 31, 2014	156,407		$	13.59	2.63	$	647
	Exercisable at December 31, 2014	156,407		$	13.59	2.63	$	647
	-1	Options granted during the year ended December 31, 2014 represent the stock options issued in conjunction with the Washington Banking Merger. See "Note 2. Business Combinations" for additional information. The weighted average exercise price reflects the exchange ratio applied to the original Washington Banking exercise price pursuant to the Merger Agreement.
	(b) Restricted and Unrestricted Stock Awards
	For the years ended December 31, 2014, 2013 and 2012 the Company recognized compensation expense related to restricted and unrestricted stock awards of $1.4 million, $1.2 million and $1.2 million, respectively, and related tax benefits of $489,000, $428,000 and $415,000, respectively. As of December 31, 2014, the total unrecognized compensation expense related to non-vested restricted and unrestricted stock awards was $2.5 million and the related weighted average period over which it is expected to be recognized is approximately 2.32 years. The vesting date fair value of restricted stock awards that vested during the years ended December 31, 2014, 2013 and 2012 was $1.4 million, $1.2 million and $842,000, respectively.
	The following tables summarize the restricted and unrestricted stock award activity for the years ended December 31, 2014, 2013 and 2012:
		Shares		Weighted-Average Grant Date Fair Value
	Nonvested at December 31, 2011	164,880		$	16.29
	Granted	91,738		14.02
	Vested	(61,445	)	17.41
	Forfeited	(5,503	)	15.21
	Nonvested at December 31, 2012	189,670		14.86
	Granted	103,195		14.31
	Vested	(86,819	)	15.55
	Forfeited	(3,107	)	14.89
	Nonvested at December 31, 2013	202,939		14.29
	Granted	130,548		16.03
	Vested	(85,373	)	14.37
	Forfeited	(9,445	)	14.67
	Nonvested at December 31, 2014	238,669		$	15.2

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Income tax expense is substantially due to Federal income taxes as the provision for the state of Oregon income taxes is insignificant. Income tax expense for the years ended December 31, 2014, 2013 and 2012 consisted of the following:
			Years Ended December 31,
			2014			2013			2012
			(In thousands)
	Current tax expense		$	9,992		$	4,344		$	5,916
	Deferred tax (benefit) expense		(3,087		)	326			185
	(Decrease) increase in valuation allowance		—			(77		)	77
	Income tax expense		$	6,905		$	4,593		$	6,178
	A reconciliation of the Company's effective income tax rate with the Federal statutory income tax rate of 35% is as follows:
			Years Ended December 31,
			2014			2013			2012
			(In thousands)
	Income tax expense at Federal statutory rate		$	9,772		$	4,959		$	6,804
	Tax-exempt instruments		(1,598		)	(858		)	(649		)
	Non-deductible acquisition costs		373			469			—
	Federal tax credits (1)		(812		)	—			—
	Effects of BOLI		(159		)	(25		)	(28		)
	Tax position resolution (2)		(728		)	—			—
	Valuation allowance		—			(77		)	77
	Other, net		57			125			(26		)
	Income tax expense		$	6,905		$	4,593		$	6,178
	-1	Federal tax credits are provided for under the New Market Tax Credit program. A subsidiary of Heritage Bank was awarded an allocation of New Market Tax Credit investments consisting of three tranches totaling $25.0 million. Gross tax credits related to these tranches totaling $9.8 million are available through 2020. The subsidiary is required to fund 85 percent of a tranche to claim the entire tax credit, and it has until May 15, 2015 to complete the funding. Tax benefits related to these credits were recognized for financial reporting purposes in the same period that the credits were recognized in the Company's income tax returns. The Company has analyzed the three tranches and believes that it is more likely than not that all tranches will be funded to 85 percent by May 15, 2015. The Company believes that these tax credits will be realized and therefore has reflected the impact of these credits in its estimated annual effective tax rate for 2014.
	-2	Washington Banking Company had recorded a liability for certain tax positions prior to the merger effective date, which the Company assumed as part of the Washington Banking Merger. These tax positions were resolved as of December 31, 2014, resulting in a decrease of the Company's income tax expense for the year ended December 31, 2014.
	The following table presents major components of the deferred income tax asset (liability) resulting from differences between financial reporting and tax basis:
			December 31, 2014			December 31, 2013
			(In thousands)
	Deferred tax assets:
	Allowance for loan losses		$	5,460		$	7,003
	Accrued compensation		1,382			821
	Stock compensation		818			524
	Capital loss carryforward		30			95
	Unrealized losses charged to earnings on other than temporarily impaired investment securities		338			622
	Net unrealized losses charged to other comprehensive income on securities		—			626
	Goodwill and other intangible assets		—			2,107
	Market discount on purchased loans		17,949			6,767
	Foregone interest on nonaccrual loans		2,337			1,026
	Net operating loss carryforward acquired from NCB		553			588
	Difference in amounts reflected in financial statements and income tax basis of certain liabilities assumed in business combinations		3,492			—
	Other deferred tax assets		1,394			705
	Total deferred tax assets		33,753			20,884
	Deferred tax liabilities:
	Deferred loan fees, net		(1,982		)	(867		)
	Premises and equipment		(1,937		)	(1,520		)
	FHLB stock		(2,768		)	(1,039		)
	Net unrealized gains charged to other comprehensive income on securities		(1,832		)	—
	Indemnification asset		(392		)	(1,539		)
	Goodwill and other intangible assets		(1,560		)	—
	Federal tax credits		(439		)	—
	Junior subordinated debentures		(2,349		)	—
	Other deferred tax liabilities		(730		)	(248		)
	Total deferred tax liabilities		(13,989		)	(5,213		)
	Deferred income tax asset, net		$	19,764		$	15,671
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. A valuation allowance is required to be recognized for the portion of the deferred tax asset that will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Based upon the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible, management expects to realize the benefits of these deductible differences at December 31, 2014.
	The Company had a net operating loss carryforward of $1.6 million and $1.7 million at December 31, 2014 and 2013, respectively, that will expire in 2033. The Company is limited to the amount of the net operating loss carryforward that it can deduct each year. The Company also had $85,000 and $270,000 of federal capital loss carryforwards as of December 31, 2014 and 2013, respectively, which will expire in 2018. A tax planning strategy has been developed that will enable the Company to deduct all of the net operating loss and capital loss carryforwards prior to their respective expirations. Based on these estimates, management has not recorded a valuation allowance as of December 31, 2014. During the year ended December 31, 2013, management reversed the valuation allowance that was established in the prior year resulting in no valuation allowance at December 31, 2013.
	As of December 31, 2014 and December 31, 2013, the Company had an insignificant amount of unrecognized tax benefits, none of which would materially affect its effective tax rate if recognized. The Company does not anticipate that the amount of unrecognized tax benefits will significantly increase or decrease in the next 12 months. The amount of interest and penalties accrued as of December 31, 2014 and 2013 and for the years ended December 31, 2014, 2013 and 2012 were immaterial.
	The Company has qualified under provisions of the Internal Revenue Code to compute income taxes after deductions of additions to the bad debt reserves when it was registered as a Savings Bank. At December 31, 2014, the Company had a taxable temporary difference of approximately $2.8 million that arose before 1988 (base-year amount). In accordance with FASB ASC 740, a deferred tax liability of an estimated $980,000 has not been recognized for the temporary difference. Management does not expect this temporary difference to reverse in the foreseeable future.
	The Company and its subsidiary file a United States consolidated federal income tax return and an Oregon State income tax return, and the tax years subject to examination by the Internal Revenue Service are the years ended December 31, 2014, 2013, 2012 and 2011.

Regulatory_Capital_Requirement

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements
	The Company is a bank holding company under the supervision of the Federal Reserve Bank of San Francisco. Bank holding companies are subject to capital adequacy requirements of the Federal Reserve Board under the Bank Holding Company Act of 1956, as amended, and the regulations of the Federal Reserve Board. Heritage Bank is a federally insured institution and thereby is subject to the capital requirements established by the FDIC. The Federal Reserve Board capital requirements generally parallel the FDIC requirements. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements and operations. Management believes as of December 31, 2014, the Company and the Bank meet all capital adequacy requirements to which they are subject.
	Pursuant to minimum capital requirements of the FDIC, Heritage Bank is required to maintain a leverage ratio (Tier 1 capital to average assets ratio) of 4.0% and risk-based capital ratios of Tier 1 capital and total capital (to total risk-weighted assets) of 4.0% and 8.0%, respectively. As of December 31, 2014 and December 31, 2013, the most recent regulatory notifications categorized Heritage Bank as well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank's categories.
			Minimum				Well-		Actual
			Requirements				Capitalized
							Requirements
			$		%		$	%	$		%
			(Dollars in thousands)
	As of December 31, 2014:
	The Company consolidated
	Tier 1 leverage capital to average assets		$	132,881	4	%	N/A	N/A	$	340,292	10.2	%
	Tier 1 capital to risk-weighted assets		97,620		4		N/A	N/A	340,292		13.9
	Total capital to risk-weighted assets		195,240		8		N/A	N/A	368,198		15.1
	Heritage Bank
	Tier 1 leverage capital to average assets		132,853		4		166,066	5	332,147		10
	Tier 1 capital to risk-weighted assets		97,585		4		146,378	6	332,147		13.6
	Total capital to risk-weighted assets		195,171		8		243,964	10	360,053		14.8
	As of December 31, 2013:
	The Company consolidated
	Tier 1 leverage capital to average assets		$	65,847	4	%	N/A	N/A	$	185,951	11.3	%
	Tier 1 capital to risk-weighted assets		47,853		4		N/A	N/A	185,951		15.5
	Total capital to risk-weighted assets		95,706		8		N/A	N/A	201,076		16.8
	Heritage Bank
	Tier 1 leverage capital to average assets		65,831		4		82,288	5	182,543		11.1
	Tier 1 capital to risk-weighted assets		47,807		4		71,710	6	182,543		15.3
	Total capital to risk-weighted assets		95,613		8		119,517	10	197,656		16.5
	In July 2013, the Federal banking regulators approved a final rule to implement the revised capital adequacy standards of the Basel Committee on Banking Supervision, commonly called Basel III, and to address relevant provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the Dodd-Frank Act). The final rule strengthens the definition of regulatory capital, increases risk-based capital requirements, makes selected changes to the calculation of risk-weighted assets, and adjusts the prompt corrective action thresholds. Community banking organizations, such as the Company and the Bank, become subject to the new rule on January 1, 2015 and certain provisions of the new rule will be phased in over the period of 2015 through 2019. The final rule:
	•	Permits banking organizations that had less than $15 billion in total consolidated assets as of December 31, 2009, or were mutual holding companies as of May 19, 2010, to include in Tier 1 capital trust preferred securities and cumulative perpetual preferred stock that were issued and included in Tier 1 capital prior to May 19, 2010, subject to a limit of 25% of Tier 1 capital elements, excluding any non-qualifying capital instruments and after all regulatory capital deductions and adjustments have been applied to Tier 1 capital.
	•	Establishes new qualifying criteria for regulatory capital, including new limitations on the inclusion of deferred tax assets and mortgage servicing rights.
	•	Requires a minimum ratio of common equity Tier 1 capital to risk-weighted assets of 4.5%.
	•	Increases the minimum Tier 1 capital to risk-weighted assets ratio requirement from 4% to 6%.
	•	Retains the minimum total capital to risk-weighted assets ratio requirement of 8%.
	•	Establishes a minimum leverage ratio requirement of 4%.
	•	Retains the existing regulatory capital framework for 1-4 family residential mortgage exposures.
	•	Permits banking organizations that are not subject to the advanced approaches rule, such as the Company and the Bank, to retain, through a one-time election, the existing treatment for most accumulated other comprehensive income, such that unrealized gains and losses on securities available for sale will not affect regulatory capital amounts and ratios.
	•	Implements a new capital conservation buffer requirement for a banking organization to maintain a common equity capital ratio more than 2.5% above the minimum common equity Tier 1 capital, Tier 1 capital and total risk-based capital ratios in order to avoid limitations on capital distributions, including dividend payments, and certain discretionary bonus payments. The capital conservation buffer requirement will be phased in beginning on January 1, 2016 at 0.625% and will be fully phased in at 2.50% by January 1, 2019. A banking organization with a buffer of less than the required amount would be subject to increasingly stringent limitations on such distributions and payments as the buffer approaches zero. The new rule also generally prohibits a banking organization from making such distributions or payments during any quarter if its eligible retained income is negative and its capital conservation buffer ratio was 2.5% or less at the end of the previous quarter. The eligible retained income of a banking organization is defined as its net income for the four calendar quarters preceding the current calendar quarter, based on the organization’s quarterly regulatory reports, net of any distributions and associated tax effects not already reflected in net income.
	•	Increases capital requirements for past-due loans, high volatility commercial real estate exposures, and certain short-term commitments and securitization exposures.
	•	Expands the recognition of collateral and guarantors in determining risk-weighted assets.
	•	Removes references to credit ratings consistent with the Dodd-Frank Act and establishes due diligence requirements for securitization exposures.
	The Company’s management is currently evaluating the provisions of the final rule and their expected impact on the Company.

Heritage_Financial_Corporation

Heritage Financial Corporation (Parent Only)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Heritage Financial Corporation (Parent Only)	Heritage Financial Corporation (Parent Company Only)
	Following is the condensed financial statements of the Parent Company.
	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Financial Condition
		December 31, 2014			December 31, 2013
		(In thousands)
	ASSETS
	Cash and interest earning deposits	$	8,835		$	2,645
	Investment in subsidiary bank	465,442			212,354
	Other assets	863			1,041
		$	475,140		$	216,040
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Junior subordinated debentures	$	19,082		$	—
	Other liabilities	1,552			278
	Total stockholders’ equity	454,506			215,762
		$	475,140		$	216,040
	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Income
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Interest income:
	Interest earning deposits and other assets	$	17		$	22		$	44
	ESOP loan	—			—			8
	Total interest income	17			22			52
	Interest expense:
	Junior subordinated debentures	458			—			—
	Total interest expense	458			—			—
	Net interest (expense) income	(441		)	22			52
	Noninterest income:
	Dividends from subsidiary banks	66,300			26,000			14,100
	Equity in (excess distributed) undistributed income of subsidiary banks	(40,737		)	(13,001		)	962
	Other income	3			—			—
	Total noninterest income	25,566			12,999			15,062
	Noninterest expense:
	Professional services	2,943			1,718			—
	Other expense	3,109			2,905			2,766
	Total noninterest expense	6,052			4,623			2,766
	Income before income taxes	19,073			8,398			12,348
	Income tax benefit	(1,941		)	(1,177		)	(913		)
	Net income	$	21,014		$	9,575		$	13,261
	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Cash Flows
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Cash flows from operating activities:
	Net income	$	21,014		$	9,575		$	13,261
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in excess distributed (undistributed) income of subsidiary bank	40,737			13,001			(962		)
	Tax (benefit) provision realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	(112		)	13			93
	Recognition of compensation related to ESOP shares and share based payment	1,395			1,223			1,185
	Stock option compensation expense	20			71			106
	Net change in other assets and liabilities	811			(489		)	7
	Net cash provided by operating activities	63,865			23,394			13,690
	Cash flows from investing activities:
	ESOP loan principal repayments	—			—			161
	Investment in subsidiary	(43,215		)	(21,666		)	—
	Net cash (used in) provided by investing activities	(43,215		)	(21,666		)	161
	Cash flows from financing activities:
	Common stock cash dividends paid	(12,892		)	(6,672		)	(12,155		)
Proceeds from exercise of stock options	921			176			129
Tax benefit (provision) realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	112			(13		)	(93		)
Repurchase of common stock	(2,601		)	(8,825		)	(6,023		)
Net cash used in financing activities	(14,460		)	(15,334		)	(18,142		)
Net increase (decrease) in cash and cash equivalents	6,190			(13,606		)	(4,291		)
Cash and cash equivalents at beginning of year	2,645			16,251			20,542
Cash and cash equivalents at end of year	$	8,835		$	2,645		$	16,251

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	Selected Quarterly Financial Data (Unaudited)
	Results of operations on a quarterly basis were as follows:
		Year Ended December 31, 2014
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
		(Dollars in thousands, except per share amounts)
	Interest income	$	17,613	$	30,023	$	35,031	$	38,439
	Interest expense	872		1,426		1,724		1,659
	Net interest income	16,741		28,597		33,307		36,780
	Provision for loan losses	458		691		594		2,851
	Net interest income after provision for loan losses	16,283		27,906		32,713		33,929
	Noninterest income	2,307		4,780		5,483		3,897
	Noninterest expense	14,779		26,994		28,363		29,243
	Income before provision for income taxes	3,811		5,692		9,833		8,583
	Income tax expense	1,268		1,544		2,765		1,328
	Net income	$	2,543	$	4,148	$	7,068	$	7,255
	Basic earnings per common share	$	0.16	$	0.16	$	0.23	$	0.24
	Diluted earnings per common share	0.16		0.16		0.23		0.24
	Cash dividends declared on common stock	0.16		—		0.09		0.25
		Year Ended December 31, 2013
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
		(Dollars in thousands, except per share amounts)
	Interest income	$	17,484	$	16,859	$	18,533	$	18,552
	Interest expense	946		919		952		907
	Net interest income	16,538		15,940		17,581		17,645
	Provision for loan losses	858		1,308		1,078		428
	Net interest income after provision for loan losses	15,680		14,632		16,503		17,217
	Noninterest income	2,282		2,357		2,582		2,430
	Noninterest expense	13,719		13,007		14,285		18,504
	Income before provision for income taxes	4,243		3,982		4,800		1,143
	Income tax expense	1,358		1,292		1,510		433
	Net income	$	2,885	$	2,690	$	3,290	$	710
	Basic earnings per common share	$	0.19	$	0.18	$	0.2	$	0.04
	Diluted earnings per common share	0.19		0.18		0.2		0.04
	Cash dividends declared on common stock	0.08		0.08		0.18		0.08

Subsequent_Event

Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event
	Subsequent to December 31, 2014, the Company sold the legacy Heritage Bank merchant card portfolio. The noninterest income related to this portfolio was recorded in the Company's Consolidated Statements of Income in Merchant Visa income, net. The total consideration of the sale was $2.2 million and will be recognized in noninterest income in the first quarter of 2015. Of this amount, $1.65 million was received by the Company at time of sale and $550,000 is held in escrow and is contingent on the performance of the portfolio in 2015. If certain performance thresholds are met, the payment will range between $440,000 and $550,000. If the thresholds are not met, no contingent payment will be made. The contingent payment is to be paid on or before December 31, 2015. This sale will impact future noninterest income.

Description_of_Business_Basis_1

Description of Business, Basis of Presentation and Significant Accounting Policies and Recent Issued Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business
	Heritage Financial Corporation ("Heritage" or the “Company”) is a bank holding company that was incorporated in the State of Washington in August 1997. The Company is primarily engaged in the business of planning, directing and coordinating the business activities of its wholly-owned bank subsidiary, Heritage Bank (the “Bank”). The Bank is a Washington-chartered commercial bank and its deposits are insured by the FDIC under the Deposit Insurance Fund. The Bank is headquartered in Olympia, Washington and conducts business from its sixty-six branch offices located throughout Washington State and the greater Portland, Oregon area. The Bank’s business consists primarily of lending and deposit relationships with small businesses and their owners in its market areas and attracting deposits from the general public. The Bank also makes real estate construction and land development loans and consumer loans and originates first mortgage loans on residential properties primarily located in its market area which is concentrated along the I-5 corridor from Whatcom County to Clark County in Washington State and Multnomah County in Oregon, as well as other contiguous markets.
	The Company has expanded its footprint through mergers and acquisitions. The largest of these transactions was the strategic merger of Washington Banking Company (“Washington Banking”) into the Company and the merger of its wholly owned subsidiary bank, Whidbey Island Bank ("Whidbey") into Heritage Bank. This merger was effective on May 1, 2014 and is referred to as the "Washington Banking Merger". The strategic merger is described in more detail in "Note 2 - Business Combinations." The Washington Banking results since May 1, 2014 are included in this Annual Report on Form 10-K. The Washington Banking Merger has allowed the expansion of the market area north of Seattle, Washington to the Canadian border.
	In connection with the Washington Banking Merger, the Company acquired Washington Banking Master Trust (the “Master Trust”), which became a wholly-owned subsidiary of the Company. The Master Trust was formed by Washington Banking in April 2007 for the exclusive purpose of issuing trust preferred securities.
Basis of Presentation	Basis of Presentation
	The accounting and reporting policies of the Company and its subsidiaries confirm to U.S. Generally Accepted Accounting Principles (“GAAP”). In preparing the Consolidated Financial Statements management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, other than temporary impairments in the fair value of investment securities, expected cash flows of purchased loans and related indemnification asset, fair value measurements, stock-based compensation, impairment of goodwill and other intangible assets and income taxes. Actual results could differ from these estimates.
	The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiary, the Bank. All significant intercompany balances and transactions among the Company and the Bank have been eliminated in consolidation.
	For financial reporting purposes, the Company's investment in the Master Trust is accounted for under the equity method and is included in prepaid expenses and other assets on the Company's Consolidated Statements of Financial Condition. The junior subordinated debentures issued and guaranteed by the Company and held by the Master Trust are reflected as liabilities on the Company's Consolidated Statements of Financial Condition.
	Certain prior year amounts have been reclassified to conform to the current year’s presentation. Reclassifications had no effect on the prior year's net income or stockholders’ equity. As a result of the Washington Banking Merger, the Company reclassified its loan portfolio. Total loans receivable are now presented in two categories: noncovered loans receivable and covered loans receivable. A description of the categories is included in the significant accounting policies below. Management made the change
Significant Accounting Policies	Significant Accounting Policies
	Cash and Cash Equivalents
	For purposes of reporting cash flows, cash and cash equivalents includes cash on hand and in banks, interest earning deposits with original maturities of 90 days or less, and federal funds sold. Net cash flows are reported for customer loan and deposit transactions, other interest bearing deposits, federal funds sold and repurchase agreements.
	Investment Securities
	The Company identifies investments as held to maturity or available for sale at the time of acquisition. Securities are classified as held to maturity when the Company has the ability and positive intent to hold them to maturity. Securities classified as available for sale are available for future liquidity requirements and may be sold prior to maturity.
	Investment securities held to maturity are recorded at cost, adjusted for amortization of premiums or accretion of discounts using the interest method. Securities available for sale are carried at fair value. Unrealized gains and losses on securities available for sale are generally excluded from earnings and are reported in other comprehensive income (loss), net of related income taxes. Realized gains and losses on sale of investment securities are computed on the specific identification method.
	Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in interest rates, there has not been significant deterioration in the financial condition of the issuer, and it is not more likely than not that the Company will be required to, nor does it have the intent to sell the security before the anticipated recovery of its remaining carrying value. If any of these criteria is not met, the impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income (loss). The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. If any of these criteria are not met, the entire difference between amortized cost and fair value is recognized as impairment through earnings, and a new cost basis is established for the security. Continued deterioration of market conditions could result in additional impairment losses recognized within the investment portfolio.
	Other factors that may be considered in determining whether a decline in the value of either a debt or an equity security is “other than temporary” include ratings by recognized rating agencies; actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security; the financial condition, capital strength and near-term prospects of the issuer and recommendations of investment advisors or market analysts.
	Loans Held for Sale
	Mortgage loans held for sale are carried at the lower of amortized cost or fair value by loan type. Any loan that management does not have the intent and ability to hold for the foreseeable future or until maturity or payoff is classified as held for sale at the time of origination, purchase or securitization, or when such decision is made. Unrealized losses on such loans are included in income.
	Loans Receivable and Loan Commitments
	Noncovered Loans:
	Noncovered loans includes loans originated by the Bank as well as loans acquired in business combinations with no related shared-loss agreements. Loans acquired in a business combination are designated as “purchased” loans. These loans are recorded at their fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date.
	Loans purchased with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are accounted for under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“FASB ASC”) 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, formerly AICPA SOP 03-3 Accounting for Certain Loans or Debt Securities Acquired in a Transfer. These loans are identified as purchased credit impaired ("PCI") loans. In situations where such loans have similar risk characteristics, loans may be aggregated into pools to estimate cash flows. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flow expectation. Expected cash flows at the acquisition date in excess of the fair value of loans are considered to be accretable yield, which is recognized as interest income over the life of the loan or pool using a level yield method if the timing and amount of the future cash flows of the pool is reasonably estimable.
	The cash flows expected over the life of the PCI loan or pool are estimated quarterly using an internal cash flow model that projects cash flows and calculates the carrying values of the loans or pools, book yields, effective interest income and impairment, if any, based on loan or pool level events. Assumptions as to default rates, loss severity and prepayment speeds are utilized to calculate the expected cash flows. To the extent actual or projected cash flows are less than previously estimated, additional provisions for loan losses on the purchased loan portfolios will be recognized immediately into earnings. To the extent actual or projected cash flows are more than previously estimated, the increase in cash flows is recognized immediately as a recapture of provision for loan losses up to the amount of any provision previously recognized for that loan or pool, if any, then prospectively recognized in interest income as a yield adjustment. Any disposals of a loan in a pool, including sale of a loan, payment in full or foreclosure results in the removal of the loan from the loan pool at the carrying amount.
	Loans accounted for under FASB ASC 310-30 are generally considered accruing and performing loans as the loans accrete interest income over the estimated life of the loan when cash flows are reasonably estimable. Accordingly, PCI loans that are contractually past due are still considered to be accruing and performing loans. If the timing and amount of cash flows is not reasonably estimable, the loans may be classified as nonaccrual loans and interest income may be recognized on a cash basis or all cash payments may be accounted for a as a reduction of the principal amount outstanding.
	Loans purchased that are not accounted for under FASB ASC 310-30 are accounted for under FASB ASC 310-20, Receivables—Nonrefundable fees and Other Costs, formerly SFAS 91 Nonrefundable fees and Other Costs. These loans are identified as non-PCI loans, and are initially recorded at their fair value, which is estimated using an internal cash flow model and assumptions similar to the FASB ASC 310-30 loans. The difference between the estimated fair value and the unpaid principal balance at acquisition date is recognized as interest income over the life of the loan using an effective interest method for non-revolving credits or a straight-line method, which approximates the effective interest method, for revolving credits. Any unrecognized discount for a loan that is subsequently repaid will be recognized immediately into income.
	Loans are generally recorded at the unpaid principal balance, net of premiums, unearned discounts and net deferred loan origination fees and costs. The premiums and unearned discounts may include values determined in purchase accounting. Interest on loans is calculated using the simple interest method based on the daily balance of the principal amount outstanding and is credited to income as earned. Loans are considered past due or delinquent when principal or interest payments are past due 30 days or more. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Delinquent loans may remain on accrual status between 30 days and 89 days past due. The accrual of interest is discontinued at the time the loan is 90 days delinquent unless the credit is well secured and in the process of collection. Loans are placed on nonaccrual at an earlier date if collection of the contractual principal or interest is doubtful. All interest accrued but not collected on loans deemed nonaccrual during the period is reversed against interest income in that period. The interest payments received on nonaccrual loans is accounted for on the cost-recovery method whereby the interest payment is applied to the principal balances. Loans may be returned to accrual status when improvements in credit quality eliminate the doubt as to the full collectability of both interest and principal and a period of sustained performance has occurred. Substantially all loans that are nonaccrual are also impaired. Income recognition on impaired loans conforms to that used on nonaccrual loans.
	Loans are charged-off if collection of the contractual principal or interest as scheduled in the loan agreement is doubtful. The Company's policies for placing loans on nonaccrual status, recording payments received on nonaccrual loans, resuming accrual of interest, determining past due or delinquency status and charging off uncollectible loans generally do not differ by loan segments or classes. However, credit card loans and other consumer loans are typically charged-off no later than 180 days past due.
	Covered Loans:
	Purchased loans subject to FDIC shared-loss agreements are identified as “covered” on the Consolidated Statements of Financial Condition. The covered loans have an additional evaluation separate from noncovered loans as they have shared-loss attributes which may reduce the Bank’s risk of loss. For further information see Note 8, “FDIC Indemnification Asset”. The covered loans include the majority of loans from the Company's acquisition of Cowlitz Bank and certain loans from the Washington Banking Merger, which included loans from Washington Banking's acquisitions of City Bank and North County Bank. The same accounting principles applicable to noncovered loans receivable apply to covered loans receivable, with the added benefit of shared-loss agreements.
	Unfunded Loan Commitments:
	Unfunded loan commitments are generally related to the unused portion of the total commitment of a loan or providing credit facilities to clients of the Bank and are not actively traded financial instruments. These unfunded commitments are disclosed as financial instruments with off-balance sheet risk in Notes 17 and 20 in the Notes to Consolidated Financial Statements.
	Impaired Loans and Troubled Debt Restructures
	Impaired Loans:
	A loan is considered impaired when, based on current information and events, it is probable the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrowers, including length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amounts of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, or as a practical expedient the loan’s observable market price or the fair value of the collateral (less cost to sell) if the loan is collateral dependent.
	Troubled Debt Restructures:
	A troubled debt restructured loan (“TDR”) is a restructuring in which the Bank, for economic or legal reasons related to a borrower’s financial difficulties, grants a concession to a borrower that it would not otherwise consider. These concessions may include changes of the interest rate, forbearance of the outstanding principal or accrued interest, extension of the maturity date, delay in the timing of the regular payment, or any other actions intended to minimize potential losses. The Bank does not forgive principal for a majority of its TDRs, but in those situations where principal is forgiven, the entire amount of such principal forgiveness is immediately charged off to the extent not done so prior to the modification. The Bank also considers insignificant delays in payments when determining if a loan should be classified as a TDR.
	A loan that has been placed on nonaccrual status that is subsequently restructured will usually remain on nonaccrual status until the borrower is able to demonstrate repayment performance in compliance with the restructured terms for a sustained period, typically for six months. A restructured loan may return to accrual status sooner based on other significant events or mitigating circumstances. A loan that has not been placed on nonaccrual status may be restructured and such loan may remain on accrual status after such restructuring. In these circumstances, the borrower has made payments before the restructuring and is expected to continue to perform after the restructuring. Generally, this type of restructuring involves a reduction in the loan interest rate and/or a change to interest-only payments for a period of time. The restructured loan is considered impaired despite the accrual status and a specific valuation allowance, is any, is calculated in the manner previously described.
	A TDR is considered defaulted if, during the 12-month period after the restructure, the loan has not performed in accordance to the restructured terms. Defaults include loans whose payments are 90 days or more past due and loans whose revised maturity date passed and no further modifications will be granted for that borrower.
	A loan may subsequently be excluded from the TDR disclosures if: (i) the restructured interest rate was greater than or equal to the interest rate of a new loan with comparable risk at the time of the restructure, and (ii) the loan is no longer impaired based on the terms of the restructured agreement. The Bank's policy is that the borrower must demonstrate a sustained period, typically six consecutive months, of payments in accordance with the modified loan before it can be reviewed for removal from the TDR disclosure under the second criteria. However, the loan must be reported as a TDR in at least one annual report on Form 10-K. Once a loan has been classified as a TDR, it will continue to be disclosed as an impaired loan until paid off or charged-off, even if the loan subsequently is no longer disclosed as a TDR.
	Loan Fees and Costs
	Loan origination fees and certain direct origination costs are deferred and amortized as an adjustment of the yields of the loans over their contractual lives, adjusted for prepayment of the loans, using the effective interest method or the straight-line method, when the straight-line method approximates the effective interest method. In the event loans are sold, the net deferred loan origination fees or costs are recognized as a component of the gains or losses on the sales of loans.
	Allowance for Loan Losses
	Allowance for Loan Losses on Loans:
	The allowance for loan losses is a reserve established through a provision for loan losses charged to expense, which represents management’s best estimate of probable losses that have been incurred within the existing portfolio of loans originated by the Bank. The allowance for loan losses on loans designated as non-PCI loans is similar to the methodology described below except that for non-PCI loans, the remaining unaccreted discounts resulting from the fair value adjustments recorded at the time the loans were purchased are additionally factored into the allowance methodology. The allowance for loan losses on PCI loans is described in the “Allowance for Loan Losses on Purchased Credit Impaired Loans” section below.
	The allowance, in the judgment of management, is necessary to reserve for estimated loan losses from risks inherent in the loan portfolio. The Company’s allowance for loan losses methodology includes allowance allocations calculated in accordance with FASB ASC 310, Receivables and allowance allocations calculated in accordance with FASB ASC 450, Contingencies. Accordingly, the methodology is based on historical loss experience by type of credit and internal risk grade, specific homogeneous risk pools and specific loss allocations, with adjustments for current events and conditions. The Company’s process for determining the appropriate level of the allowance for loan losses is designed to account for credit deterioration as it occurs. The provision for loan losses reflects loan quality trends, including the levels of and trends related to nonaccrual loans, past due loans, potential problem loans, criticized loans and net charge-offs or recoveries, among other factors. The provision for loan losses also reflects all actions taken on all loans for a particular period. Therefore, the amount of the provision reflects not only the necessary increases in the allowance for loan losses related to newly identified criticized loans, but it also reflects actions taken related to other loans including, among other things, any necessary increases or decreases in specific valuation allowances for impaired loans or loan pools. Losses are charged against the allowance when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.
	The level of the allowance reflects management’s continuing evaluation of known and inherent risks in the loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off.
	Loans which management determines are impaired are individually evaluated for impairment, and specific valuation allowances are recorded, if any, on these loans based on the methodology previously described. Loans that are determined not to meet management's definition of impaired are collectively evaluated for impairment based on (i) historical loss factor determined in accordance with FASB ASC 450 based on historical loan loss experience for similar loans with similar characteristics and trends; and (ii) environmental loss factors that reflect the impact of current conditions, as determined in accordance with FASB ASC 450 based on general economic conditions and other qualitative risk factors both internal and external to the Company. The historical loss factors and environmental loss factors are combined and multiplied against the outstanding principal balances of loans in pools of similar loans with similar characteristics.
	The Company evaluates specific loans for credit quality indicators and performs regular analysis and evaluation of problem loans. Loans are classified based on an internal credit risk grading process that evaluates, among other things: (i) the obligor’s ability to repay; (ii) the underlying collateral, if any; and (iii) the economic environment and industry in which the borrower operates. This analysis is performed at the loan officer level for all loans. When a loan is performing but has an assigned risk grade other than pass, the loan officer analyzes the loan to determine an appropriate monitoring and collection strategy. When a loan is nonperforming or has been classified as a nonaccrual loan, a member from the special assets department will analyze the loan to determine if it is impaired. If the loan is considered impaired, the special asset department will evaluate the need for a specific valuation allowance on the loan. Specific valuation allowances are determined by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and economic conditions affecting the borrower’s industry, among other things.
	Historical loss factors are calculated based on the historical loss experience and recovery experience of specific classes of loans. The Company calculates historical loss ratios for the classes of loans based on the proportion of actual charge-offs and recoveries experienced to the total loans in the pool for a rolling twelve quarter average.
	Environmental loss factors are based on general economic conditions and other qualitative risk factors both internal and external to the Company. In general, such valuation allowances are determined by evaluating, among other things: (i) levels of and trends in delinquencies and impaired loans; (ii) levels and trends in charge-offs and recoveries; (iii) effects of changes in risk selection and underwriting standards, and other changes in lending policies, procedures, and practices; (iv) experience, ability, and depth of lending management and other relevant staff; (v) national and local economic trends and conditions; (vi) external factors such as competition, legal, and regulatory and; (vii) effects of changes in credit concentrations. Management evaluates the degree of risk that each one of these components has on the quality of the loan portfolio on a quarterly basis. Each component is determined to be on a scale of risk. The results are then utilized in a matrix to determine an appropriate environmental loss factor for each class of loan. An additional environmental factor is added after the calculated matrix factor if the specific loan is risk graded worse than a rating of "watch".
	The allowance for loan losses evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. While management utilizes its best judgment and information available to recognize losses on loans, future additions to the allowance may be necessary based on declines in local and national economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Bank’s allowance for loan losses. Such agencies may require the Bank to make adjustments to the allowance based on their judgments about information available to them at the time of their examinations. The Company believes the allowance for loan losses is appropriate given all of the above considerations.
	Allowance for Loan Losses on Purchased Credit Impaired Loans:
	The PCI loans acquired in the Company's mergers and acquisitions are subject to the Company’s internal and external credit review. Under the accounting guidance of FASB ASC 310-30, the allowance for loan losses on PCI loans is measured at each financial reporting period, or measurement date, based on expected cash flows. If and when credit deterioration, or decreases in expected cash flows initially estimated, occurs subsequent to the acquisition date, a provision for loan losses will be charged to earnings as of the measurement date. For the covered PCI loans, a provision for loan losses is charged to earnings for the full amount without regard to the FDIC shared-loss agreement, and the portion of the loss reimbursable from the FDIC is recorded in noninterest income and increases the FDIC indemnification asset.
	Allowance for Losses on Unfunded Commitments:
	The Bank is also party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit risk in excess of the disbursed amounts recognized in the Consolidated Statements of Financial Condition. The Company has a policy in which it evaluates the risk on a quarterly basis, and provides for an allowance for credit losses, as necessary. The methodology is similar to the allowance for loan losses, and includes an estimate of the probability of drawdown of the loan commitment. Based on its analysis, the Company has recorded an allowance for off-balance sheet financial instruments of $170,000 and $110,000 as of December 31, 2014 and 2013, respectively. This allowance is reported within accrued expenses and other liabilities on the Company's Consolidated Statements of Financial Condition.
	Mortgage Banking Operations
	Prior to the second quarter of 2013 and subsequent to the second quarter 2014, the Company sells one-to-four family residential loans on a servicing released basis and recognized a cash gain or loss. A cash gain or loss is recognized to the extent that the sales proceeds of the loans sold differ from the net book value at the time of sale. Income from one-to-four family residential loans brokered to other lenders is recognized into income on date of loan closing.
	Commitments to sell one-to-four family residential loans are made primarily during the period between the taking of the loan application and the closing of the loan. The timing of making these sale commitments is dependent upon the timing of the borrower’s election to lock-in the mortgage interest rate and fees prior to loan closing. Most of these sale commitments are made on a best-efforts basis whereby the Bank is only obligated to sell the loan if the loan is approved and closed by the Bank. Commitments to fund one-to-four family residential loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these loans are accounted for as free standing derivatives. Fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates between the date the interest on the loan was locked and the balance sheet date. The Company enters into forward commitments for the future delivery of one-to-four family residential loans when interest rate locks are entered into, in order to hedge the interest rate risk resulting from its commitments to fund the loans. Changes in the fair values of these derivatives are included in other income. The fair value of these derivative instruments was not significant at December 31, 2014. As there were no such commitments at December 31, 2013, there was no associated derivative at that date.
	FDIC Indemnification Asset
	The FDIC indemnification asset was measured at estimated fair value at acquisition dates on the same basis as the covered loans, and represents the present value of the estimated losses on covered loans to be reimbursed by the FDIC. The present value was calculated using the shorter of the shared-loss agreement terms or the life of the loan. Under the terms of the FDIC shared-loss agreements, the FDIC absorbs 80% of losses and receives 80% of loss recoveries for the covered loans during the terms of the agreements. Certain shared-loss agreements have loss minimums or tranches which may reduce the shared-loss percentages during the coverage period. The FDIC indemnification asset is reduced as losses are recognized on covered loans and shared-loss payments are received from the FDIC. Since the FDIC indemnification asset was initially recorded at estimated fair value using a discount rate, a portion of the discount is accreted into noninterest income during each reporting period.
	The FDIC indemnification asset is evaluated quarterly. Realized losses in excess of prior estimates immediately increase the FDIC indemnification asset by a credit to noninterest income. Conversely, if realized losses are less than prior estimates, the FDIC indemnification asset is reduced by a charge to noninterest income on a prospective basis, and any change in value would be limited to the contractual terms of the shared-loss agreements.
	Other Real Estate and Other Assets Owned
	Other real estate acquired by the Company in satisfaction of debt is held for sale and recorded at fair value at time of foreclosure. When property is acquired, it is recorded at the estimated fair value (less the costs to sell) at the date of acquisition, not to exceed net realizable value, and any resulting write-down is charged to the allowance for loan losses. After acquisition, all costs incurred in maintaining the property are expensed. Costs relating to the development and improvement of the property, however, are capitalized to the extent of the property’s net realizable value.
	Premises and Equipment
	Premises and equipment, including leasehold improvements, are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the lease period, whichever is shorter. The estimated useful lives used to compute depreciation and amortization for buildings and building improvements is 15 to 39 years; and for furniture, fixtures and equipment is three to seven years. The Company reviews buildings, leasehold improvements and equipment for impairment whenever events or changes in the circumstances indicate that the undiscounted cash flows for the property are less than its carrying value. If identified, an impairment loss is recognized through a charge to earnings based on the fair value of the property.
	Bank Owned Life Insurance
	The Company has bank owned life insurance (“BOLI”), the majority of which was acquired in the Washington Banking Merger with fair value totaling $32.5 million at May 1, 2014. These policies insure the lives of certain current or former Bank officers or former Whidbey officers, and name the Bank as beneficiary. Noninterest income is generated tax-free (subject to certain limitations) from the increase in the policies' underlying investments made by the insurance company.  The Bank utilizes BOLI to partially offset costs associated with employee compensation and benefit programs with the earnings on the BOLI. The Company records BOLI at the amount that can be realized under the insurance contract at the statement of financial condition date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
	Other Intangible Assets
	The other intangible assets represents the Core Deposit Intangible (“CDI”) acquired in business combinations. The fair value of the CDI stemming from any given business combination is based on the present value of the expected cost savings attributable to the core deposit funding, relative to an alternative source of funding. The CDI is amortized over an estimated useful life which approximates the existing deposit relationships acquired on an accelerated method. The Company evaluates such identifiable intangibles for impairment when an indication of impairment exists.
	Goodwill
	The Company’s goodwill represents the excess of the purchase price over the fair value of net assets acquired in the purchases of Washington Banking Company in 2014, Valley Community Bancshares in 2013, Western Washington Bancorp in 2006 and North Pacific Bank in 1998. The Company’s goodwill is assigned to Heritage Bank and is evaluated for impairment at the Heritage Bank level (reporting unit).
	In accordance with Accounting Standards Update ("ASU") 2011-08 Intangibles – Goodwill and Other (Topic 350), an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. In other words, before the first step of the existing guidance, the entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that the fair value of goodwill is less than carrying value. The qualitative assessment includes adverse events or circumstances identified that could negatively affect the reporting units’ fair value as well as positive and mitigating events. Such indicators may include, among others: a significant change in legal factors or in the general business climate; significant change in the Company’s stock price and market capitalization; unanticipated competition; and an action or assessment by a regulator. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step process is unnecessary. The entity has the option to bypass the qualitative assessment step for any reporting unit in any period and proceed directly to the first step of the exiting two-step process. The entity can resume performing the qualitative assessment in any subsequent period.
The first step of the goodwill impairment test is performed, when considered necessary, by comparing the reporting unit’s aggregate fair value to its carrying value. Absent other indicators of impairment, if the aggregate fair value exceeds the carrying value, goodwill is not considered impaired and no additional analysis is necessary. If the carrying value of the reporting unit were to exceed the aggregate fair value, a second step would be performed to measure the amount of impairment loss, if any. To measure any impairment loss the implied fair value would be determined in the same manner as if the reporting unit were being acquired in a business combination. If the implied fair value of goodwill is less than the recorded goodwill, an impairment charge would be recorded for the difference.
Income Taxes
The Company and its bank subsidiary file a United States consolidated federal income tax return and an Oregon State income tax return. Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates applicable to taxable income in the periods in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rate is recognized in income in the period that includes the enactment date. A valuation allowance, if needed, reduces deferred tax assets to the amounts expected to be realized.
A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
The Company’s policy is to recognize interest and penalties on unrecognized tax benefits in “income taxes” in the Consolidated Statements of Income as the amounts are generally insignificant each year.
Employee Stock Ownership Plan
The Company sponsored an Employee Stock Ownership Plan ("ESOP"). The ESOP purchased 2% of the common stock issued in a January 1998 stock offering and borrowed $1.3 million from the Company in order to fund the purchase of the Company’s common stock. The loan to the ESOP was repaid in full as of December 31, 2012. When outstanding, the loan was repaid principally from the Bank's contributions to the ESOP. The Bank's contributions were sufficient to service the debt over the 15-year loan term at the interest rate of 8.5% . As the debt was repaid, shares were released and allocated to plan participants based on the proportion of debt service paid during the year. As shares were released, compensation expense was recorded equal to the then current market price of the shares and the shares became outstanding for earnings per common share calculations. Cash dividends on allocated shares were recorded as a reduction of retained earnings and paid or distributed directly to participants’ accounts. Cash dividends on unallocated shares were recorded as a reduction of debt and accrued interest.
Stock-Based Compensation
The Company maintains a number of stock-based incentive programs, which are discussed in more detail in Note 21, "Stock-Based Compensation." Compensation cost is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. The Company did not grant stock option awards for the years ended December 31, 2014, 2013 or 2012, other than the options granted in 2014 as part of the Washington Banking Merger. The fair value of stock options granted would be estimated on the date of grant using the Black-Scholes-Merton option pricing model. The market price of the Company’s common stock at the date of grant is used for the restricted stock awards. Compensation cost is recognized over the requisite service period, generally defined as the vesting period, on a straight-line basis.
Deferred Compensation Plans
The Company has adopted a Deferred Compensation Plan and has entered into arrangements with certain executive officers. Under the Plan, participants are permitted to elect to defer compensation and the Company has the discretion to make additional contributions to the Plan on behalf of any participant based on a number of factors. Such discretionary contributions are generally approved by the Compensation Committee of the Company's Board of Directors. The notional account balances of participants under the Plan earn interest on an annual basis. The applicable interest rate is the Moody’s Seasoned Aaa Corporate Bond Yield as of January 1 of each year. Generally, a participant’s account is payable upon the earliest of the participant’s separation from service with the Company, the participant’s death or disability, or a specified date that is elected by the participant in accordance with applicable rules of the Internal Revenue Code. The Company’s obligation to make payments under the Plan is a general obligation of the Company and is to be paid from the Company’s general assets. As such, participants are general unsecured creditors of the Company with respect to their participation under the Plan. The Company records a liability within accrued expenses and other liabilities on the Consolidated Statements of Financial Condition and records compensation expense in a systematic and rationale manner. Since the amounts earned are generally based on the Company’s annual performance, the Company records deferred compensation expense each year for an amount calculated based on that year’s financial performance.
Earnings per Share
Basic earnings per common share is net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options. Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
Operating Segments
While the Company’s chief decision-makers monitor the revenue streams of the various products and services, operations are managed and financial performance is evaluated on a Company-wide basis. Operating segments are aggregated into one as operating results for all segments are similar. Accordingly, all of the financial service operations are considered by management to be aggregated in one reportable operating segment.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	FASB ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, A Similar Tax Loss, or a Tax Credit Carryforward Exists, was issued in July 2013. This Update provides that an unrecognized tax benefit, or a portion thereof, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except to the extent that a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date to settle any additional income taxes that would result from disallowance of a tax position, or the tax law does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented as a liability. This Update was effective for the Company for the year ended December 31, 2014. The adoption of this Update did not have a material impact on the Company's Consolidated Financial Statements.
	FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, was issued in January 2014.  The objective of this Update is to provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The Update permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the consolidated statements of income as a component of income tax expense (benefit). The standard will be effective for the Company beginning January 1, 2015; however, early adoption was permitted. The Company adopted the provisions of this Update during the year ended December 31, 2014. The adoption of this Update did not have a material impact on the Company’s Consolidated Financial Statements.
	FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, was issued in January 2014. This Update intends to reduce variations in practice by clarifying when an in-substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The Update states that the real estate property should be recognized upon either the creditor obtaining legal title or the borrower conveying all interest through a deed in lieu of foreclosure or similar legal agreement. The Update is effective for interim and annual reporting periods beginning after December 15, 2014. Early adoption is permitted. The Company adopted the amendments in the first quarter of 2014. The adoption did not have an impact on the Company's Consolidated Financial Statements.
	FASB ASU 2014-09, Revenue from Contracts with Customers, was issued in May 2014. Under this Update, FASB created a new Topic 606 which is in response to a joint initiative of FASB and the International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and international financial reporting standards that would:
	1	Remove inconsistencies and weaknesses in revenue requirements.
	2	Provide a more robust framework for addressing revenue issues.
	3	Improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets.
	4	Provide more useful information to users of financial statements through improved disclosure requirements.
	5	Simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer.
	The Update is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. The Company is currently evaluating the impact that this Update will have on its Consolidated Financial Statements.
	FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, was issued in June 2014. This Update aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements, such as secured borrowings. The guidance eliminates sale accounting and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement. The Update requires new and expanded disclosures that are effective for interim or annual reporting periods beginning after December 15, 2014. Early adoption for a public company is prohibited. The Company does not anticipate the adoption of this Update will have a material impact on its Consolidated Financial Statements.
	FASB ASU 2014-14, Receivables - Troubled Debt Restructurings by Creditors: Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure, was issued in August 2014 to reduce the diversity of classification of government-guaranteed mortgages upon foreclosure. The Update requires that mortgage loans be derecognized and that a separate other receivable be recognized upon foreclosure if certain conditions are met. The separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in this Update are effective for interim and annual periods beginning after December 15, 2014. Early adoption is permitted. The Company adopted the amendment in the third quarter of 2014. The adoption did not have an impact on the Company's Consolidated Financial Statements.
Fair Value Measurements	Loans Receivable:
	Except for impaired loans discussed previously, fair value is based on discounted cash flows using current market rates applied to the estimated life (Level 3). While these methodologies are permitted under U.S. GAAP, they are not based on the exit price concept of the fair value required under ASC 820-10, Fair Value Measurements and Disclosures, and generally produce a higher value.

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Breakdown of consideration transferred	The total consideration transferred in the Washington Banking Merger consisted of the following:
			Washington Banking
			(In thousands)
	Consideration transferred
	Cash paid (1)		$	42,895
	Fair value of common shares issued (2)		224,151
	Fair value of restricted stock unit awards (3)		2,092
	Fair value of common stock options		481
	Total consideration transferred		$	269,619
	-1	Includes $3,000 of cash paid due to fractional shares and $27,000 of cash paid from dissenters.
	-2	Total of 13,870,716 shares issued. Excludes 1,686 shares dissented and paid in cash and 165 fractional shares paid in cash.
	-3	Total number of converted shares was 129,462. Fair value includes 26,783 shares which were forfeited by the Washington Banking stockholder to pay applicable taxes, totaling fair value of $433,000.
Preliminary fair value estimates of assets acquired and liabilities assumed	The fair value estimates of the assets acquired and liabilities assumed in the indicated merger and acquisitions were as follows:
		Washington Banking			Valley			NCB
		1-May-14			15-Jul-13			9-Jan-13
		(In thousands)
	Assets
	Cash and cash equivalents	$	74,947		$	40,643		$	2,712
	Other interest earning deposits	—			13,866			1,003
	Investment securities available for sale	458,312			31,444			2,753
	Investment securities held to maturity	—			22,908			—
	Loans held for sale	3,923			—			—
	Noncovered loans receivable	895,978			117,071			51,509
	Covered loans receivable	107,050			—			—
	FDIC indemnification asset	7,174			—			—
	Other real estate owned ($5,122, $0, and $0 covered by FDIC shared-loss agreements, respectively)	7,121			—			2,279
	Premises and equipment	31,776			6,558			214
	Federal Home Loan Bank stock	7,064			366			88
	Bank owned life insurance	32,519			—			—
	Accrued Interest Receivable	4,943			465			232
	Other intangible assets	11,194			916			156
	Prepaid expenses and other assets	14,852			3,087			4,048
	Total assets acquired	1,656,853			237,324			64,994
	Liabilities
	Deposits	1,433,894			207,013			60,442
	Junior subordinated debentures	18,937			—			—
	Accrued expenses and other liabilities	24,067			342			1,186
	Total liabilities assumed	1,476,898			207,355			61,628
	Net assets acquired	$	179,955		$	29,969		$	3,366
	A summary of the net assets purchased, the fair value adjustments and resulting goodwill recognized from the Washington Banking Merger and Valley Acquisition and the resulting bargain purchase gain recognized on the NCB Acquisition are presented in the following table. Goodwill on mergers and acquisitions represents the excess of the consideration transferred over the estimated fair value of the net assets acquired and liabilities assumed. A bargain purchase gain on bank acquisition represents the excess of the estimated fair value of the net assets acquired and liabilities assumed over the value of the consideration paid. The bargain purchase gain in the NCB Acquisition was influenced significantly by the net deferred tax asset acquired. NCB had significant net operating losses and as a result of its estimate of whether or not it was more likely than not that the net deferred tax asset would be realized, had recorded a full valuation allowance on the net deferred tax asset. The Company, however, has reviewed the net deferred tax asset and determined it is more likely than not that the net deferred tax asset would be realized by the Company.
		Washington Banking			Valley			NCB
		1-May-14			15-Jul-13			9-Jan-13
		(In thousands)
	Cost basis of net assets on merger date	$	181,782		$	29,720		$	6,113
	Less: Consideration transferred	(269,619		)	(46,323		)	(2,967		)
	Fair value adjustments:
	Other interest earning deposits	—			162			7
	Investment securities	—			—			(2		)
	Loans held for sale	86			—			—
	Noncovered loans receivable	(12,811		)	(3,003		)	(3,299		)
	Covered loans receivable	6,384			—			—
	FDIC indemnification asset	357			—			—
	Other real estate owned	387			—			(1,301		)
	Premises and equipment	(1,540		)	1,837			(69		)
	Other intangible assets	10,216			916			156
	Prepaid expenses and other assets	(6,416		)	198			2,394
	Deposits	(1,737		)	(9		)	(11		)
	Junior subordinated debentures	6,837			—			—
	Accrued expenses and other liabilities	(3,590		)	149			(622		)
	(Goodwill) bargain purchase gain recognized	$	(89,664	)	$	(16,353	)	$	399
Unaudited pro forma information	The following table presents certain pro forma information, for illustrative purposes only, for the years ended December 31, 2014 and 2013 as if the Washington Banking Merger had occurred on January 1, 2013. The estimated pro forma information combines the historical results of Washington Banking with the Company's consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the Washington Banking Merger occurred on January 1, 2013. In particular, no adjustments have been made to eliminate the impact of the Washington Banking loans previously accounted for under ASC 310-30 that may have been necessary if these loans had been recorded at fair value at January 1, 2013. The pro forma information also does not consider any changes to the provision for loan losses resulting from recorded loans at fair value. Additionally, Heritage expects to achieve further operating savings and other business synergies, including interest income growth, as a result of the Washington Banking Merger which are not reflected in the pro forma amounts in the following table. As a result, actual amounts will differ from the pro forma information presented.
			Pro Forma for the Year Ended December 31,
			2014			2013
			(Dollars In Thousands, except per share amounts)
	Net interest income		$	144,470		$	147,267
	Net income		35,758			30,718
	Basic earnings per common share		$	1.19		$	1.04
	Diluted earnings per common share		1.18			1.04

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of securities available for sale	The amortized cost, gross unrealized gains, gross unrealized losses and fair values of investment securities available for sale at the dates indicated were as follows:
		Securities Available for Sale
		31-Dec-14
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	21,414	$	44		$	(31	)	$	21,427
	Municipal securities	170,082		3,139			(184		)	173,037
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	539,859		4,015			(1,475		)	542,399
	Corporate obligations	4,034		—			(24		)	4,010
	Mutual funds and other equities	1,956		17			—			1,973
	Total	$	737,345	$	7,215		$	(1,714	)	$	742,846
		Securities Available for Sale
		31-Dec-13
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	6,098	$	3		$	(62	)	$	6,039
	Municipal securities	49,989		806			(1,735		)	49,060
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	108,466		898			(1,329		)	108,035
	Total	$	164,553	$	1,707		$	(3,126	)	$	163,134
Schedule of securities held to maturity	The amortized cost, gross unrecognized gains, gross unrecognized losses and fair values of investment securities held to maturity at the dates indicated were as follows:
		Securities Held to Maturity
		31-Dec-14
		Amortized		Gross			Gross			Fair
		Cost		Unrecognized			Unrecognized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	1,591	$	167		$	—		$	1,758
	Municipal securities	22,486		643			(11		)	23,118
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	10,866		364			(74		)	11,156
	Private residential collateralized mortgage obligations	871		75			(104		)	842
	Total	$	35,814	$	1,249		$	(189	)	$	36,874
		Securities Held to Maturity
		31-Dec-13
		Amortized		Gross			Gross			Fair
		Cost		Unrecognized			Unrecognized			Value
				Gains			Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	1,687	$	153		$	—		$	1,840
	Municipal securities	24,290		200			(184		)	24,306
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	9,129		144			(284		)	8,989
	Private residential collateralized mortgage obligations	1,048		185			(28		)	1,205
	Total	$	36,154	$	682		$	(496	)	$	36,340
Schedule of maturities of investment securities	The amortized cost and fair value of securities at December 31, 2014, by contractual maturity, are set forth below. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay obligations with or without call or prepayment penalties.
		Securities Available for Sale					Securities Held to Maturity
		Amortized		Fair			Amortized			Fair Value
		Cost		Value			Cost
		(In thousands)
	Due in one year or less	$	4,148	$	4,171		$	2,895		$	2,912
	Due after one year through three years	31,547		31,693			4,336			4,385
	Due after three years through five years	23,675		24,104			5,490			5,710
	Due after five years through ten years	150,635		151,946			18,558			19,359
	Due after ten years	525,384		528,959			4,535			4,508
	Investment securities with no stated maturity	1,956		1,973			—			—
	Total	$	737,345	$	742,846		$	35,814		$	36,874
Schedule of fair value and unrealized losses of available for sale investment securities	Available for sale investment securities with unrealized losses as of December 31, 2014 and December 31, 2013 were as follows:
		Securities Available for Sale
		31-Dec-14
		Less than 12 Months					12 Months or						Total
							Longer
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	3,567	$	(31	)	$	—		$	—		$	3,567	$	(31	)
	Municipal securities	25,176		(184		)	—			—			25,176		(184		)
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	182,970		(1,475		)	—			—			182,970		(1,475		)
	Corporate obligations	2,119		(24		)	—			—			2,119		(24		)
	Total	$	213,832	$	(1,714	)	$	—		$	—		$	213,832	$	(1,714	)
		Securities Available for Sale
		31-Dec-13
		Less than 12 Months					12 Months or						Total
							Longer
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	U.S. Treasury and U.S. Government-sponsored agencies	$	3,031	$	(62	)	$	—		$	—		$	3,031	$	(62	)
	Municipal securities	21,471		(1,242		)	4,644			(493		)	26,115		(1,735		)
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	56,327		(1,184		)	7,758			(145		)	64,085		(1,329		)
	Total	$	80,829	$	(2,488	)	$	12,402		$	(638	)	$	93,231	$	(3,126	)
Schedule of fair value and unrealized losses of held to maturity investment securities	Held to maturity investment securities with unrecognized losses as of December 31, 2014 and December 31, 2013 were as follows:
		Securities Held to Maturity
		31-Dec-14
		Less than 12					12 Months or						Total
		Months					Longer
		Fair		Unrecognized			Fair			Unrecognized			Fair		Unrecognized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	Municipal securities	$	2,196	$	(11	)	$	—		$	—		$	2,196	$	(11	)
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	2,553		(74		)	—			—			2,553		(74		)
	Private residential collateralized mortgage obligations	558		(104		)	—			—			558		(104		)
	Total	$	5,307	$	(189	)	$	—		$	—		$	5,307	$	(189	)
		Securities Held to Maturity
		31-Dec-13
		Less than 12					12 Months or						Total
		Months					Longer
		Fair		Unrecognized			Fair			Unrecognized			Fair		Unrecognized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	Municipal securities	$	10,967	$	(184	)	$	—		$	—		$	10,967	$	(184	)
	Mortgage backed securities and collateralized mortgage obligations-residential:
	U.S. Government-sponsored agencies	4,869		(284		)	—			—			4,869		(284		)
	Private residential collateralized mortgage obligations	211		(5		)	124			(23		)	335		(28		)
	Total	$	16,047	$	(473	)	$	124		$	(23	)	$	16,171	$	(496	)
Schedule of other-than-temporary impairment losses investment securities	The following table summarizes activity for the years ended December 31, 2014, 2013 and 2012 related to the amount of impairments on held to maturity securities:
		Life-to-Date Gross Other-Than-Temporary Impairments (1)		Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income (Loss)			Life-to-Date Net
							Other-Than-Temporary Impairments Included in Earnings
		(In thousands)
	31-Dec-11	$	2,435	$	1,100		$	1,335
	Subsequent impairments	130		52			78
	31-Dec-12	2,565		1,152			1,413
	Subsequent impairments	38		—			38
	December 31, 2013	2,603		1,152			1,451
	Subsequent impairments	45		—			45
	December 31, 2014	$	2,648	$	1,152		$	1,496
	-1	Life-to-date gross other-than-temporary impairments disclosed in this table are not reflective of subsequent recoveries, if any.
Scheduled of amortized cost and fair value of securities pledged as collateral	The following table summarizes the amortized cost and fair value of available for sale and held to maturity securities that are pledged as collateral for the following obligations at December 31, 2014 and December 31, 2013:
		December 31, 2014					December 31, 2013
		Amortized		Fair			Amortized			Fair
		Cost		Value			Cost			Value
		(In thousands)
	Washington and Oregon state to secure public deposits	$	150,507	$	153,785		$	80,386		$	80,881
	Federal Reserve Bank and FHLB to secure borrowing arrangements	4,430		4,460			—			—
	Repurchase agreements	43,676		44,457			34,170			33,893
	Other securities pledged	14,828		14,922			—			—
	Total	$	213,441	$	217,624		$	114,556		$	114,774

Noncovered_Loans_Receivable_Ta

Noncovered Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of impaired purchased loans accretable yield	Details of certain mortgage banking activities are as follows:
			Years Ended or As of December 31,
			2014				2013
			(In thousands)
	Loans held for sale at lower of cost or market		$	5,582			$	—
	One-to-four family residential loans sold during the year		55,997				8,460
	Commitments to sell mortgage loans		10,625				—
	Commitments to fund mortgage loans (at interest rates approximating market rates):
	Fixed rate		$	8,467			$	—
	Variable or adjustable rate		2,158				—
Schedule of related party transactions	Activity in related party loans for the years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):
	Balance outstanding at December 31, 2011	$	10,391
	Principal additions	8,906
	Principal reductions	(7,855		)
	Balance outstanding at December 31, 2012	11,442
	Principal additions	—
	Elimination of outstanding loan balance due to change in related party status	(3,045		)
	Principal reductions	(923		)
	Balance outstanding at December 31, 2013	7,474
	Principal additions	23
	Additional of outstanding loan balance due to change in related party status	1,858
	Principal reductions	(191		)
	Balance outstanding at December 31, 2014	$	9,164
Summary of Loans Sales Activities	Details of certain SBA loan sales activities are as follows:
			31-Dec-14				31-Dec-13
			(In thousands)
	SBA loans serviced for others with participating interest (1)		$	77,233			$	26,854
	SBA loans serviced for others with no participating interest		—				—
	-1	Represents the gross balance of the loan at year end. The participation owned by the Bank totaled $29.0 million and $9.4 million, respectively, at December 31, 2014 and 2013 and is included in the balance of noncovered loans receivable on the Company's Consolidated Statements of Financial Condition.
Noncovered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of loans receivable	Noncovered loans receivable at December 31, 2014 and December 31, 2013 consisted of the following portfolio segments and classes:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	551,343			$	336,540
	Owner-occupied commercial real estate	535,742				281,309
	Non-owner occupied commercial real estate	616,757				399,979
	Total commercial business	1,703,842				1,017,828
	One-to-four family residential	63,540				43,082
	Real estate construction and land development:
	One-to-four family residential	46,749				19,724
	Five or more family residential and commercial properties	61,360				48,655
	Total real estate construction and land development	108,109				68,379
	Consumer	250,323				41,547
	Gross noncovered loans receivable	2,125,814				1,170,836
	Net deferred loan fees	(937		)		(2,670		)
	Noncovered loans receivable, net	2,124,877				1,168,166
	Allowance for loan losses	(22,153		)		(22,657		)
	Noncovered loans receivable, net of allowance for loan losses	$	2,102,724			$	1,145,509
Loans receivable by credit quality indicator	The following tables present the balance of the noncovered loans receivable by credit quality indicator as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	509,483			$	14,487			$	27,049			$	324	$	551,343
	Owner-occupied commercial real estate	496,234				22,946				16,562				—		535,742
	Non-owner occupied commercial real estate	584,262				17,643				14,852				—		616,757
	Total commercial business	1,589,979				55,076				58,463				324		1,703,842
	One-to-four family residential	61,185				315				2,040				—		63,540
	Real estate construction and land development:
	One-to-four family residential	34,356				3,977				8,416				—		46,749
	Five or more family residential and commercial properties	57,025				—				4,335				—		61,360
	Total real estate construction and land development	91,381				3,977				12,751				—		108,109
	Consumer	242,836				—				7,487				—		250,323
	Gross noncovered loans	$	1,985,381			$	59,368			$	80,741			$	324	$	2,125,814
		December 31, 2013
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	304,959			$	9,183			$	20,849			$	1,549	$	336,540
	Owner-occupied commercial real estate	269,130				3,814				8,365				—		281,309
	Non-owner occupied commercial real estate	381,355				9,037				8,723				864		399,979
	Total commercial business	955,444				22,034				37,937				2,413		1,017,828
	One-to-four family residential	40,245				269				2,568				—		43,082
	Real estate construction and land development:
	One-to-four family residential	11,582				4,159				3,983				—		19,724
	Five or more family residential and commercial properties	45,332				—				3,323				—		48,655
	Total real estate construction and land development	56,914				4,159				7,306				—		68,379
	Consumer	39,432				248				1,867				—		41,547
	Gross noncovered loans	$	1,092,035			$	26,710			$	49,678			$	2,413	$	1,170,836
Past due financing receivables	The balances of noncovered past due loans, segregated by segments and classes of loans, as of December 31, 2014 and December 31, 2013 were as follows:
		December 31, 2014
		30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
						Greater				Due								and  Still
																		Accruing (1)
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,503			$	1,962			$	4,465			$	546,878	$	551,343	$	—
	Owner-occupied commercial real estate	1,038				100				1,138				534,604		535,742		—
	Non-owner occupied commercial real estate	113				75				188				616,569		616,757		—
	Total commercial business	3,654				2,137				5,791				1,698,051		1,703,842		—
	One-to-four family residential	200				—				200				63,340		63,540		—
	Real estate construction and land development:
	One-to-four family residential	62				2,135				2,197				44,552		46,749		—
	Five or more family residential and commercial properties	—				376				376				60,984		61,360		—
	Total real estate construction and land development	62				2,511				2,573				105,536		108,109		—
	Consumer	2,413				125				2,538				247,785		250,323		—
	Gross noncovered loans	$	6,329			$	4,773			$	11,102			$	2,114,712	$	2,125,814	$	—
	-1	Excludes PCI loans.
		December 31, 2013
		30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
						Greater				Due								and  Still
																		Accruing (1)
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,493			$	4,379			$	6,872			$	329,668	$	336,540	$	—
	Owner-occupied commercial real estate	808				849				1,657				279,652		281,309		—
	Non-owner occupied commercial real estate	1,161				179				1,340				398,639		399,979		6
	Total commercial business	4,462				5,407				9,869				1,007,959		1,017,828		6
	One-to-four family residential	571				509				1,080				42,002		43,082		—
	Real estate construction and land development:
	One-to-four family residential	821				1,045				1,866				17,858		19,724		—
	Five or more family residential and commercial properties	384				453				837				47,818		48,655		—
	Total real estate construction and land development	1,205				1,498				2,703				65,676		68,379		—
	Consumer	210				13				223				41,324		41,547		—
	Gross noncovered loans	$	6,448			$	7,427			$	13,875			$	1,156,961	$	1,170,836	$	6
	-1	Excludes PCI loans.
Recorded investment balance and related allowance for loan losses of accruing and non-accruing TDRs	The recorded investment balance and related allowance for loan losses of noncovered performing and noncovered nonaccrual TDRs as of December 31, 2014 and December 31, 2013 were as follows:
		December 31, 2014								December 31, 2013
		Performing				Nonaccrual				Performing				Nonaccrual
		TDRs				TDRs				TDRs				TDRs
		(In thousands)
	Noncovered TDRs	$	18,764			$	5,010			$	22,131			$	2,634
	Allowance for loan losses on noncovered TDRs	1,908				1,033				2,957				191
Troubled debt restructurings on financing receivables	Noncovered loans that were modified as TDRs during the years ended December 31, 2014 and 2013 are set forth in the following table:
		Years Ended December 31,
		2014							2013
		Number of			Outstanding				Number of			Outstanding
		Contracts			Principal Balance				Contracts			Principal Balance
		-1			(1)(2)				-1			(1)(2)
		(Dollars in thousands)
	Commercial business:
	Commercial and industrial	32			$	5,926			33			$	6,570
	Owner-occupied commercial real estate	3			1,063				5			537
	Non-owner occupied commercial real estate	3			6,548				2			192
	Total commercial business	38			13,537				40			7,299
	One-to-four family residential	—			—				1			252
	Real estate construction and land development:
	One-to-four family residential	10			3,553				24			3,639
	Five or more family residential and commercial properties	—			—				1			2,404
	Total real estate construction and land development	10			3,553				25			6,043
	Consumer	3			219				3			141
	Total noncovered TDRs	51			$	17,309			69			$	13,735
	-1	Number of contracts and outstanding principal balance represent loans which have balances as of period end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
	-2	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bank’s recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification), except when the modification was the initial advance on a one-to-four family residential real estate construction and land development loan under a master guidance line. During the year ended December 31, 2014, the Company's initial advance at the time of modification on these construction loans totaled $45,000, the total commitment amount was $190,000 and the outstanding principal balance at December 31, 2014 was $188,000. During the year ended December 31, 2013, the Company's initial advance at the time of modification on these construction loans totaled $1.1 million, the total commitment amount was $4.3 million and the outstanding principal balance at December 31, 2013 was $2.5 million.
Troubled debt restructuring loans, subsequently defaulted	The noncovered loans modified during the previous twelve months ended December 31, 2014 and 2013 that subsequently defaulted during the years ended December 31, 2014 and 2013 are included in the following table:
		Year Ended December 31, 2014							Year Ended December 31, 2013
		Number of			Outstanding				Number of			Outstanding
		Contracts			Principal Balance				Contracts			Principal Balance
		(Dollars in thousands)
	Commercial business:
	Commercial and industrial	—			$	—			3			$	918
	Non-owner occupied commercial real estate	1			75				—			—
	Total commercial business	1			75				3			918
	Total noncovered loans receivable	1			$	75			3			$	918
Noncovered Nonaccrual Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of nonaccrual loans	Noncovered nonaccrual loans, segregated by segments and classes of loans, were as follows as of December 31, 2014 and December 31, 2013:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	3,463			$	4,648
	Owner-occupied commercial real estate	1,163				1,024
	Non-owner occupied commercial real estate	93				3
	Total commercial business	4,719				5,675
	One-to-four family residential	—				340
	Real estate construction and land development:
	One-to-four family residential	2,652				1,045
	Total real estate construction and land development	2,652				1,045
	Consumer	139				678
	Gross noncovered nonaccrual loans	$	7,510			$	7,738
Noncovered Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of impaired loans, including restructured	Noncovered impaired loans includes noncovered nonaccrual loans and noncovered performing TDRs. The balance of noncovered impaired loans as of December 31, 2014 and December 31, 2013 are set forth in the following tables.
		December 31, 2014
		Recorded				Recorded				Total				Unpaid		Related
		Investment With				Investment With				Recorded				Contractual		Specific
		No Specific				Specific				Investment				Principal		Valuation
		Valuation				Valuation								Balance		Allowance
		Allowance				Allowance
		(In thousands)
	Commercial business:
	Commercial and industrial	$	1,134			$	7,906			$	9,040			$	9,349	$	1,325
	Owner-occupied commercial real estate	360				2,421				2,781				2,781		684
	Non-owner occupied commercial real estate	2,459				4,846				7,305				7,279		465
	Total commercial business	3,953				15,173				19,126				19,409		2,474
	One-to-four family residential	—				245				245				245		75
	Real estate construction and land development:
	One-to-four family residential	2,307				2,217				4,524				4,964		396
	Five or more family residential and commercial properties	—				2,056				2,056				2,056		234
	Total real estate construction and land development	2,307				4,273				6,580				7,020		630
	Consumer	33				172				205				208		56
	Gross noncovered loans	$	6,293			$	19,863			$	26,156			$	26,882	$	3,235
		December 31, 2013
		Recorded				Recorded				Total				Unpaid		Related
		Investment With				Investment With				Recorded				Contractual		Specific
		No Specific				Specific				Investment				Principal		Valuation
		Valuation				Valuation								Balance		Allowance
		Allowance				Allowance
		(In thousands)
	Commercial business:
	Commercial and industrial	$	6,140			$	4,850			$	10,990			$	13,287	$	2,716
	Owner-occupied commercial real estate	1,118				1,880				2,998				3,023		595
	Non-owner occupied commercial real estate	3,300				4,123				7,423				7,412		364
	Total commercial business	10,558				10,853				21,411				23,722		3,675
	One-to-four family residential	592				—				592				619		—
	Real estate construction and land development:
	One-to-four family residential	3,773				911				4,684				5,426		211
	Five or more family residential and commercial properties	2,404				—				2,404				2,404		—
	Total real estate construction and land development	6,177				911				7,088				7,830		211
	Consumer	100				678				778				780		153
	Gross noncovered loans	$	17,427			$	12,442			$	29,869			$	32,951	$	4,039
Schedule of average recorded investment impaired loans including restructuring loans	The average recorded investment of noncovered impaired loans for the years ended December 31, 2014, 2013 and 2012 are set forth in the following table.
		Years Ended December 31,
		2014				2013				2012
		(In thousands)
	Commercial business:
	Commercial and industrial	$	10,946			$	12,628			$	11,467
	Owner-occupied commercial real estate	3,215				2,638				2,141
	Non-owner occupied commercial real estate	7,744				7,897				8,174
	Total commercial business	21,905				23,163				21,782
	One-to-four family residential	514				880				977
	Real estate construction and land development:
	One-to-four family residential	5,416				4,237				4,381
	Five or more family residential and commercial properties	2,154				2,839				5,415
	Total real estate construction and land development	7,570				7,076				9,796
	Consumer	779				254				427
	Gross noncovered impaired loans	$	30,768			$	31,373			$	32,982
Noncovered PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased impaired loans	The following tables reflect the outstanding principal balance and recorded investment at December 31, 2014 and December 31, 2013 of the noncovered PCI loans:
		December 31, 2014								31-Dec-13
		Outstanding Principal				Recorded Investment				Outstanding Principal				Recorded Investment
		(In thousands)
	Commercial business:
	Commercial and industrial	$	22,144			$	18,040			$	18,193			$	16,779
	Owner-occupied commercial real estate	18,165				16,208				5,510				5,119
	Non-owner occupied commercial real estate	12,684				11,185				8,276				6,785
	Total commercial business	52,993				45,433				31,979				28,683
	One-to-four family residential	2,269				2,235				4,055				3,768
	Real estate construction and land development:
	One-to-four family residential	8,456				4,223				1,967				32
	Five or more family residential and commercial properties	2,721				2,963				1,077				1,357
	Total real estate construction and land development	11,177				7,186				3,044				1,389
	Consumer	5,983				7,055				1,150				2,177
	Gross noncovered PCI loans	$	72,422			$	61,909			$	40,228			$	36,017
Schedule of impaired purchased loans accretable yield	The following tables summarize the accretable yield on the noncovered PCI loans resulting from the Pierce, NCB, Valley and Washington Banking acquisitions for the years ended December 31, 2014, 2013 and 2012.
			Years Ended December 31,
			2014				2013				2012
		(In thousands)
	Balance at the beginning of the year		$	7,714			$	7,352			$	14,638
	Accretion		(4,305		)		(4,402		)		(6,238		)
	Disposal and other		(3,263		)		(318		)		(2,798		)
	Change in accretable yield (1)		12,426				5,082				1,750
	Balance at the end of the year		$	12,572			$	7,714			$	7,352
	-1	Includes accretable difference at acquisition.

Covered_Loans_Receivable_Table

Covered Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of impaired purchased loans accretable yield	Details of certain mortgage banking activities are as follows:
			Years Ended or As of December 31,
			2014				2013
			(In thousands)
	Loans held for sale at lower of cost or market		$	5,582			$	—
	One-to-four family residential loans sold during the year		55,997				8,460
	Commitments to sell mortgage loans		10,625				—
	Commitments to fund mortgage loans (at interest rates approximating market rates):
	Fixed rate		$	8,467			$	—
	Variable or adjustable rate		2,158				—
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of loans receivable	The recorded investment of covered loans receivable at December 31, 2014 and December 31, 2013 consisted of the following portfolio segments and classes:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	19,110			$	14,690
	Owner-occupied commercial real estate	59,244				24,366
	Non-owner occupied commercial real estate	26,879				14,625
	Total commercial business	105,233				53,681
	One-to-four family residential	5,990				4,777
	Real estate construction and land development:
	One-to-four family residential	2,446				1,556
	Five or more family residential and commercial properties	3,560				—
	Total real estate construction and land development	6,006				1,556
	Consumer	8,971				3,740
	Gross covered loans receivable	126,200				63,754
	Allowance for loan losses	(5,576		)		(6,167		)
	Covered loans receivable, net	$	120,624			$	57,587
Loans receivable by credit quality indicator	The following tables present the recorded invested balance of the covered loans receivable by credit quality indicator as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	11,297			$	131			$	5,442			$	2,240	$	19,110
	Owner-occupied commercial real estate	40,357				4,957				13,583				347		59,244
	Non-owner occupied commercial real estate	9,656				40				17,183				—		26,879
	Total commercial business	61,310				5,128				36,208				2,587		105,233
	One-to-four family residential	5,414				425				151						5,990
	Real estate construction and land development:
	One-to-four family residential	2,178				—				268				—		2,446
	Five or more family residential and commercial properties	1,758				—				1,802				—		3,560
	Total real estate construction and land development	3,936				—				2,070				—		6,006
	Consumer	7,030				—				1,941				—		8,971
	Gross covered loans receivable	$	77,690			$	5,553			$	40,370			$	2,587	$	126,200
		December 31, 2013
		Pass				OAEM				Substandard				Doubtful		Total
		(In thousands)
	Commercial business:
	Commercial and industrial	$	9,516			$	3,887			$	702			$	585	$	14,690
	Owner-occupied commercial real estate	21,084				2,318				708				256		24,366
	Non-owner occupied commercial real estate	6,534				55				4,631				3,405		14,625
	Total commercial business	37,134				6,260				6,041				4,246		53,681
	One-to-four family residential	3,739				882				156				—		4,777
	Real estate construction and land development:
	One-to-four family residential	698				—				858				—		1,556
	Five or more family residential and commercial properties	—				—				—				—		—
	Total real estate construction and land development	698				—				858				—		1,556
	Consumer	3,116				106				518				—		3,740
	Gross covered loans receivable	$	44,687			$	7,248			$	7,573			$	4,246	$	63,754
Past due financing receivables	The balances of covered past due loans, segregated by segments and classes of loans, as of December 31, 2014 and December 31, 2013 were as follows:
		December 31, 2014
		30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
						Greater				Due								and  Still
																		Accruing (1)
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,262			$	1,163			$	3,425			$	15,685	$	19,110	$	—
	Owner-occupied commercial real estate	645				2,680				3,325				55,919		59,244		—
	Non-owner occupied commercial real estate	1,713				456				2,169				24,710		26,879		—
	Total commercial business	4,620				4,299				8,919				96,314		105,233		—
	One-to-four family residential	112				—				112				5,878		5,990		—
	Real estate construction and land development:
	One-to-four family residential	178				90				268				2,178		2,446		—
	Five or more family residential and commercial properties	—				220				220				3,340		3,560		—
	Total real estate construction and land development	178				310				488				5,518		6,006		—
	Consumer	263				727				990				7,981		8,971		—
	Gross covered loans receivable	$	5,173			$	5,336			$	10,509			$	115,691	$	126,200	$	—
	-1	Excludes covered PCI loans.
		December 31, 2013
		30-89 Days				90 Days or				Total Past				Current		Total		90 Days or More
						Greater				Due								and  Still
																		Accruing (1)
		(In thousands)
	Commercial business:
	Commercial and industrial	$	726			$	1,156			$	1,882			$	12,808	$	14,690	$	—
	Owner-occupied commercial real estate	28				147				175				24,191		24,366		—
	Non-owner occupied commercial real estate	—				3,540				3,540				11,085		14,625		—
	Total commercial business	754				4,843				5,597				48,084		53,681		—
	One-to-four family residential	113				—				113				4,664		4,777		—
	Real estate construction and land development:
	One-to-four family residential	213				644				857				699		1,556		—
	Five or more family residential and commercial properties	—				—				—				—		—		—
	Total real estate construction and land development	213				644				857				699		1,556		—
	Consumer	67				78				145				3,595		3,740		—
	Gross covered loans receivable	$	1,147			$	5,565			$	6,712			$	57,042	$	63,754	$	—
	-1	Excludes covered PCI loans.
Recorded investment balance and related allowance for loan losses of accruing and non-accruing TDRs	The recorded investment balance and related allowance for loan losses of covered performing and covered nonaccrual TDRs as of December 31, 2014 and December 31, 2013 were as follows:
		December 31, 2014								December 31, 2013
		Performing				Nonaccrual				Performing				Nonaccrual
		TDRs				TDRs				TDRs				TDRs
		(In thousands)
	Covered TDRs	$	10,289			$	2,246			$	4,211			$	7
	Allowance for loan losses on covered TDRs	1				2				660				—
Troubled debt restructurings on financing receivables	Covered loans that were modified as TDRs during the years ended December 31, 2014 and 2013 are set forth in the following table:
		Years Ended December 31,
		2014							2013
		Number of			Outstanding				Number of			Outstanding
		Contracts			Principal Balance				Contracts			Principal Balance
		-1			(1)(2)				-1			(1)(2)
		(Dollars in thousands)
	Commercial business:
	Commercial and industrial	7			$	3,394			3			$	3,792
	Owner-occupied commercial real estate	2			1,133				—			—
	Non-owner occupied commercial real estate	2			7,561				—			—
	Total commercial business	11			12,088				3			3,792
	One-to-four family residential	—			—				—			—
	Real estate construction and land development:
	One-to-four family residential	—			—				—			—
	Five or more family residential and commercial properties	1			428				—			—
	Total real estate construction and land development	1			428				—			—
	Consumer	—			—				—			—
	Total covered TDRs	12			$	12,516			3			$	3,792
	-1	Number of contracts and outstanding principal balance represent loans which have balances as of year end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
	-2	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bank’s recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification).
Purchased impaired loans	The following tables reflect the outstanding principal balance and recorded investment at December 31, 2014 and December 31, 2013 of the covered PCI loans:
		December 31, 2014								December 31, 2013
		Outstanding Principal				Recorded Investment				Outstanding Principal				Recorded Investment
		(In thousands)
	Commercial business:
	Commercial and industrial	$	9,635			$	7,134			$	10,608			$	8,680
	Owner-occupied commercial real estate	23,071				20,666				11,538				10,923
	Non-owner occupied commercial real estate	20,607				20,257				10,611				12,187
	Total commercial business	53,313				48,057				32,757				31,790
	One-to-four family residential	3,837				3,478				3,966				3,530
	Real estate construction and land development:
	One-to-four family residential	103				1,308				1,298				1,556
	Five or more family residential and commercial properties	2,140				1,802				—				—
	Total real estate construction and land development	2,243				3,110				1,298				1,556
	Consumer	2,945				2,717				2,022				2,000
	Gross covered PCI loans	$	62,338			$	57,362			$	40,043			$	38,876
Schedule of impaired purchased loans accretable yield	The following table summarizes the accretable yield on the covered PCI loans resulting from the Cowlitz Acquisition and Washington Banking Merger for the years ended December 31, 2014, 2013 and 2012.
		Years Ended December 31,
		2014				2013				2012
		(In thousands)
	Balance at the beginning of the year	$	9,535			$	14,286			$	19,912
	Accretion	(3,749		)		(4,210		)		(6,679		)
	Disposal and other	(1,718		)		(4,902		)		(1,140		)
	Change in accretable yield (1)	4,452				4,361				2,193
	Balance at the end of the year	$	8,520			$	9,535			$	14,286
	-1	Includes accretable difference at acquisition.
Covered Nonaccrual Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of average recorded investment impaired loans including restructuring loans	The recorded investment balance of covered nonaccrual loans, segregated by segments and classes of loans, were as follows as of December 31, 2014 and December 31, 2013:
		December 31, 2014				December 31, 2013
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,321			$	—
	Owner-occupied commercial real estate	1,132				—
	Non-owner-occupied commercial real estate	424				—
	Total commercial business	3,877				—
	Real estate construction and land development:
	One-to-four family residential	179				—
	Consumer	6				7
	Gross covered nonaccrual loans	$	4,062			$	7
Covered Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of average recorded investment impaired loans including restructuring loans	The average recorded investment of covered impaired loans for the years ended December 31, 2014 and 2013 are set forth in the following table.
			Years Ended December 31,
			2014				2013				2012
			(In thousands)
	Commercial business:
	Commercial and industrial		$	3,421			$	1,484			$	21
	Owner-occupied commercial real estate		367				—				—
	Non-owner occupied commercial real estate		171				—				—
	Total commercial business		3,959				1,484				21
	One-to-four family residential		90				459				187
	Real estate construction and land development:
	One-to-four family residential		36				—				—
	Total real estate construction and land development		36				—				—
	Consumer		7				20				26
	Gross covered impaired loans		$	4,092			$	1,963			$	234
Schedule of impaired loans, including restructured	Covered impaired loans as of December 31, 2014 and December 31, 2013 are set forth in the following tables.
		December 31, 2014
		Recorded				Recorded				Total				Unpaid		Related
		Investment With				Investment With				Recorded				Contractual		Specific
		No Specific				Specific				Investment				Principal		Valuation
		Valuation				Valuation								Balance		Allowance
		Allowance				Allowance
		(In thousands)
	Commercial business:
	Commercial and industrial	$	2,240			$	94			$	2,334			$	3,696	$	9
	Owner-occupied commercial real estate	—				1,132				1,132				1,156		295
	Non-owner occupied commercial real estate	—				424				424				440		66
	Total commercial business	2,240				1,650				3,890				5,292		370
	Real estate construction and land development:
	One-to-four family residential	—				179				179				182		51
	Total real estate construction and land development	—				179				179				182		51
	Consumer	—				6				6				8		2
	Gross covered impaired loans	$	2,240			$	1,835			$	4,075			$	5,482	$	423
		December 31, 2013
		Recorded				Recorded				Total				Unpaid		Related
		Investment With				Investment With				Recorded				Contractual		Specific
		No Specific				Specific				Investment				Principal		Valuation
		Valuation				Valuation								Balance		Allowance
		Allowance				Allowance
		(In thousands)
	Commercial business:
	Commercial and industrial	$	10			$	3,751			$	3,761			$	3,761	$	629
	Total commercial business	10				3,751				3,761				3,761		629
	One-to-four family residential	—				450				450				423		31
	Consumer	7				—				7				8		—
	Gross covered impaired loans	$	17			$	4,201			$	4,218			$	4,192	$	660

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Allowance for Loan Losses [Line Items]
Schedule of changes in allowance for loan losses	The following table details the activity in the allowance for loan losses for the year ended December 31, 2014 and the balance in the allowance for loan losses disaggregated on the basis of the Company’s impairment method as of December 31, 2014:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Allowance for loan losses for the year ended December 31, 2014:
	31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
	Charge-offs	(4,504		)	(337		)	(411		)	(31		)	(345		)	—			(969		)	—			(6,597		)
	Recoveries	716			—			—			7			43			—			142			—			908
	Provisions for loan losses	863			383			623			124			368			19			1,999			215			4,594
	31-Dec-14	$	10,553		$	4,095		$	5,538		$	1,200		$	1,786		$	972		$	2,769		$	816		$	27,729
	Allowance for loan losses as of December 31, 2014 allocated to:
	Noncovered loans individually evaluated for impairment	$	1,325		$	684		$	465		$	75		$	396		$	234		$	56		$	—		$	3,235
	Noncovered loans collectively evaluated for impairment	6,449			1,629			2,541			530			322			650			1,931			816			14,868
	Covered loans individually evaluated for impairment	9			295			66			—			51			—			2			—			423
	Covered loans collectively evaluated for impairment	108			14			6			8			—			—			12			—			148
	Noncovered PCI loans collectively evaluated for impairment	2,191			330			353			207			264			88			617			—			4,050
	Covered PCI loans collectively evaluated for impairment	471			1,143			2,107			380			753			—			151			—			5,005
	December 31, 2014	$	10,553		$	4,095		$	5,538		$	1,200		$	1,786		$	972		$	2,769		$	816		$	27,729
	The following table details the activity in the allowance for loan losses for the year ended December 31, 2013 and the balance in the allowance for loan losses disaggregated on the basis of the Company’s impairment method as of December 31, 2013:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Allowance for loan losses for the year ended December 31, 2013:
	31-Dec-12	$	9,912		$	4,021		$	5,369		$	1,221		$	3,131		$	2,309		$	1,761		$	870		$	28,594
	Charge-offs	(2,826		)	(247		)	—			(52		)	(423		)	(142		)	(681		)	—			(4,371		)
	Recoveries	248			560			—			—			—			32			89			—			929
	Provisions for / (reallocation of) loan losses	6,144			(285		)	(43		)	(69		)	(988		)	(1,246		)	428			(269		)	3,672
	31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
	Allowance for loan losses as of December 31, 2013 allocated to:
	Noncovered loans individually evaluated for impairment	$	2,716		$	595		$	364		$	—		$	211		$	—		$	153		$	—		$	4,039
	Noncovered loans collectively evaluated for impairment	6,727			2,101			2,516			570			429			855			575			601			14,374
	Covered loans individually evaluated for impairment	629			—			—			31			—			—			—			—			660
	Covered loans collectively evaluated for impairment	18			7			14			13			—			—			57			—			109
	Noncovered PCI loans collectively evaluated for impairment	2,294			348			359			216			291			98			638			—			4,244
	Covered PCI loans collectively evaluated for impairment	1,094			998			2,073			270			789			—			174			—			5,398
	31-Dec-13	$	13,478		$	4,049		$	5,326		$	1,100		$	1,720		$	953		$	1,597		$	601		$	28,824
	The following table details the activity in the allowance for loan losses for the year ended December 31, 2012:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Unallocated			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
Allowance for loan losses for the year ended December 31, 2012:
31-Dec-11	$	11,805		$	2,979		$	4,394		$	794		$	4,823		$	3,800		$	1,410		$	910		$	30,915
Charge-offs	(2,292		)	(1,142		)	(292		)	(391		)	(835		)	(445		)	(677		)	—			(6,074		)
Recoveries	1,560			8			11			—			125			—			33			—			1,737
Provisions for / (reallocation of) loan losses	(1,161		)	2,176			1,256			818			(982		)	(1,046		)	995			(40		)	2,016
31-Dec-12	$	9,912		$	4,021		$	5,369		$	1,221		$	3,131		$	2,309		$	1,761		$	870		$	28,594
Schedule of loan receivables on the basis of impairment method	The following table details the recorded investment balance of the loan receivables disaggregated on the basis of the Company’s impairment method as of December 31, 2014:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Noncovered loans individually evaluated for impairment	$	9,040		$	2,781		$	7,305		$	245		$	4,524		$	2,056		$	205		$	26,156
	Noncovered loans collectively evaluated for impairment	524,263			516,753			598,267			61,060			38,002			56,341			243,063			2,037,749
	Covered loans individually evaluated for impairment	2,334			1,132			424			—			179			—			6			4,075
	Covered loans collectively evaluated for impairment	9,642			37,446			6,198			2,512			959			1,758			6,248			64,763
	Noncovered PCI loans collectively evaluated for impairment	18,040			16,208			11,185			2,235			4,223			2,963			7,055			61,909
	Covered PCI loans collectively evaluated for impairment	7,134			20,666			20,257			3,478			1,308			1,802			2,717			57,362
	Total gross loans receivable as of December 31, 2014	$	570,453		$	594,986		$	643,636		$	69,530		$	49,195		$	64,920		$	259,294		$	2,252,014
	The following table details the recorded investment balance of the loan receivables disaggregated on the basis of the Company’s impairment method as of December 31, 2013:
		Commercial			Owner-			Non-owner			One-to-four			Real estate			Real estate			Consumer			Total
		and			occupied			occupied			family			construction			construction
		industrial			commercial			commercial			residential			and land			and land
					real estate			real estate						development:			development:
														one-to-four			five or more
														family			family
														residential			residential
																	and
																	commercial
																	properties
		(In thousands)
	Noncovered loans individually evaluated for impairment	$	10,990		$	2,998		$	7,423		$	592		$	4,684		$	2,404		$	778		$	29,869
	Noncovered loans collectively evaluated for impairment	308,771			273,192			385,771			38,722			15,008			44,894			38,592			1,104,950
	Covered loans individually evaluated for impairment	3,761			—			—			450			—			—			7			4,218
	Covered loans collectively evaluated for impairment	2,249			13,443			2,438			797			—			—			1,733			20,660
	Noncovered PCI loans collectively evaluated for impairment	16,779			5,119			6,785			3,768			32			1,357			2,177			36,017
	Covered PCI loans collectively evaluated for impairment	8,680			10,923			12,187			3,530			1,556			—			2,000			38,876
	Total gross loans receivable as of December 31, 2013	$	351,230		$	305,675		$	414,604		$	47,859		$	21,280		$	48,655		$	45,287		$	1,234,590
Originated Loans
Allowance for Loan Losses [Line Items]
Schedule of changes in allowance for loan losses	A summary of the changes in the noncovered loans’ allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 are as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	22,657		$	24,242		$	26,952
	Charge-offs	(3,643		)	(4,298		)	(6,017		)
	Recoveries of loans previously charged-off	907			929			1,737
	Provision for loan losses	2,232			1,784			1,570
	Balance at the end of the year	$	22,153		$	22,657		$	24,242
Purchased Loans
Allowance for Loan Losses [Line Items]
Schedule of changes in allowance for loan losses	A summary of the changes in the covered loans’ allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 are as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	6,167		$	4,352		$	3,963
	Charge-offs	(2,954		)	(73		)	(57		)
	Recoveries of loans previously charged-off	1			—			—
	Provision for loan losses	2,362			1,888			446
	Balance at the end of the year	$	5,576		$	6,167		$	4,352

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2014
FDIC Indemnification Asset [Abstract]
Schedule of FDIC indemnification asset	Changes in the FDIC indemnification asset during the years ended December 31, 2014, 2013 and 2012 were as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	4,382		$	7,100		$	10,350
	Additions as a result of the Washington Banking Merger	7,174			—			—
	Cash payments received or receivable from the FDIC	(7,897		)	(2,537		)	(2,217		)
	Loan (recapture) impairment	(1,072		)	1,086			843
	Net amortization	(1,471		)	(1,267		)	(1,876		)
	Balance at the end of the year	$	1,116		$	4,382		$	7,100

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Changes in other real estate owned	Changes in other real estate owned during the years ended December 31, 2014, 2013 and 2012 were as follows:
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Balance at the beginning of the year	$	4,559		$	5,666		$	4,484
	Additions	1,566			2,974			7,406
	Additions from acquisitions	7,121			2,279			—
	Proceeds from dispositions	(9,914		)	(6,253		)	(5,987		)
	Gain on sales, net	23			264			587
	Valuation adjustment	—			(371		)	(824		)
	Balance at the end of the year	$	3,355		$	4,559		$	5,666

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of premises and equipment	A summary of premises and equipment is as follows:
		December 31, 2014		December 31, 2013
		(In thousands)
	Land	$	22,364	$	10,876
	Buildings and building improvements	52,067		33,482
	Furniture, fixtures and equipment	14,280		18,054
	Total premises and equipment	88,711		62,412
	Less accumulated depreciation	23,773		28,064
	Premises and equipment, net	$	64,938	$	34,348

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Change in other intangible assets	The following table presents the change in the other intangible assets for the periods indicated:
		Years Ended
		December 31,
		2014		2013		2012
		(In thousands)
	Balance at the beginning of the year	$	1,615	$	1,086	$	1,513
	Additions as a result of acquisitions	11,194		1,072		—
	Less: amortization expense	1,920		543		427
	Balance at the end of the year	$	10,889	$	1,615	$	1,086
Schedule of intangible assets, future amortization expense	The estimated aggregated amortization expense related to these intangible assets for future years is as follows:
		Years Ending December 31,
		(In thousands)
	2015	$	2,072
	2016	1,443
	2017	1,285
	2018	1,122
	2019	1,043
	Thereafter	3,924
		$	10,889

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Summary of deposits	Deposits consisted of the following:
			December 31, 2014				December 31, 2013
			Amount		Percent		Amount			Percent
			(Dollars in thousands)
	Noninterest demand deposits		$	709,673	24.4	%	$	349,902		25	%
	NOW accounts		793,362		27.3		352,051			25.2
	Money market accounts		520,065		17.9		232,016			16.6
	Savings accounts		357,834		12.3		155,790			11.1
	Total non-maturity deposits		2,380,934		81.9		1,089,759			77.9
	Certificate of deposit accounts		525,397		18.1		309,430			22.1
	Total deposits		$	2,906,331	100	%	$	1,399,189		100	%
Schedule of interest expense	Interest expense, by category, is as follows:
			Years Ended December 31,
			2014		2013			2012
			(In thousands)
	NOW accounts		$	1,011	$	645		$	797
	Money market accounts		896		386			452
	Savings accounts		252		164			204
	Certificate of deposit accounts		2,991		2,478			3,016
			$	5,150	$	3,673		$	4,469
Scheduled maturities of certificates of deposit for future years	Scheduled maturities of certificates of deposit for future years are as follows:
		Year Ending December 31,
		(In thousands)
	2015	$	347,895
	2016	107,849
	2017	35,254
	2018	13,887
	2019	19,883
	Thereafter	629
		$	525,397

Commitments_and_Contingencies_1

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of estimated future minimum annual rental commitments under noncancelable leases	The estimated future minimum annual rental commitments under noncancelable leases having an original or remaining term of more than one year are as follows:
		Years Ending December 31,
		(In thousands)
	2015	$	3,307
	2016	2,984
	2017	2,741
	2018	2,276
	2019	1,504
	Thereafter	3,723
		$	16,535
Summary of outstanding commitments to extend credit, including letters of credit	The following table presents outstanding commitments to extend credit, including letters of credit, at the dates indicated:
			December 31, 2014		December 31, 2013
			(In thousands)
	Commercial business:
	Commercial and industrial		$	288,930	$	169,079
	Owner-occupied commercial real estate		2,648		2,812
	Non-owner occupied commercial real estate		20,240		2,405
	Total commercial business		311,818		174,296
	One-to-four family residential		—		45
	Real estate construction and land development:
	One-to-four family residential		24,028		12,236
	Five or more family residential and commercial properties		32,653		20,720
	Total real estate construction and land development		56,681		32,956
	Consumer		122,633		27,480
	Total outstanding commitments		$	491,132	$	234,777

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Schedule of earnings per share reconciliation	The following table illustrates the reconciliation of weighted average shares used for earnings per common share computations for the years ended December 31, 2014, 2013 and 2012:
		Years Ended
		December 31,
		2014				2013			2012
		(Dollars in thousands)
	Net income:
	Net income	$	21,014			$	9,575		$	13,261
	Less: Dividends and undistributed earnings allocated to participating securities	(163		)		(118		)	(162		)
	Net income allocated to common stockholders	$	20,851			$	9,457		$	13,099
	Basic:
	Weighted average common shares outstanding	25,641,229				15,667,912			15,262,452
	Less: Restricted stock awards	(210,690		)		(191,677		)	(182,303		)
	Total basic weighted average common shares outstanding	25,430,539				15,476,235			15,080,149
	Diluted:
	Basic weighted average common shares outstanding	25,430,539				15,476,235			15,080,149
	Incremental shares from stock options	46,750				11,480			14,640
	Total diluted weighted average common shares outstanding	25,477,289				15,487,715			15,094,789
Schedule of dividends activity	The following table summarizes the dividend activity for the years ended December 31, 2014, 2013 and 2012.
	Declared		Cash Dividend per Share		Record Date		Paid Date
	1-Feb-12		$0.06		10-Feb-12		24-Feb-12
	26-Apr-12		$0.08		10-May-12		24-May-12
	26-Jun-12		$0.20		10-Jul-12		24-Jul-12
	25-Jul-12		$0.08		14-Aug-12		24-Aug-12
	30-Oct-12		$0.08		9-Nov-12		21-Nov-12
	30-Nov-12		$0.30		26-Nov-12		6-Dec-12
	January 30, 2013		$0.08		February 8, 2013		February 22, 2013
	April 24, 2013		$0.08		May 10, 2013		May 24, 2013
	July 23, 2013		$0.18		August 6, 2013		August 15, 2013
	October 23, 2013		$0.08		November 5, 2013		November 15, 2013
	29-Jan-14		$0.08		February 10, 2014		February 24, 2014
	27-Mar-14		$0.08		April 8, 2014		April 23, 2014
	July 24, 2014		$0.09		August 7, 2014		August 21, 2014
	October 23, 2014		$0.09		November 6, 2014		November 20, 2014
	November 11, 2014		$0.16		December 2, 2014		December 12, 2014
Repurchased shares and average share prices	The following table provides total repurchased shares and average share prices under the applicable Plans and years indicated:
		Years Ended December 31,
		2014				2013			2012			Plan Total
	Ninth Plan
	Repurchased shares	—				—			389,627			590,832
	Stock repurchase average share price	$	—			$	—		$	13.45		$	12.83
	Tenth Plan
	Repurchased shares	108,075				544,000			52,900			704,975
	Stock repurchase average share price	$	16.68			$	15.88		$	13.88		$	15.85
	Eleventh Plan
	Repurchased shares	—				—			—			—
	Stock repurchase average share price	$	—			$	—		$	—		$	—

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Changes in accumulated other comprehensive (loss) income ("AOCI") by component	The changes in accumulated other comprehensive income (loss) (“AOCI”) by component, during the years ended December 31, 2014, 2013 and 2012 are as follows:
		Year ended December 31, 2014
		Changes in			Accretion of other-than-			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	(923	)	$	(239	)	$	(1,162	)
	Other comprehensive income before reclassification	4,676			50			4,726
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	(186		)	—			(186		)
	Net current period other comprehensive income	4,490			50			4,540
	Balance of AOCI at the end of the year	$	3,567		$	(189	)	$	3,378
	-1	All amounts are net of tax.
		Year ended December 31, 2013
		Changes in			Accretion of other-than-			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	2,042		$	(298	)	$	1,744
	Other comprehensive (loss) income before reclassification	(2,965		)	59			(2,906		)
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	—			—			—
	Net current period other comprehensive (loss) income	(2,965		)	59			(2,906		)
	Balance of AOCI at the end of the year	$	(923	)	$	(239	)	$	(1,162	)
	-1	All amounts are net of tax.
		Year ended December 31, 2012
		Changes in			Accretion of other-than-			Other-than-temporary impairments on securities held to maturity (1)			Total
		fair value of			temporary
		available for sale securities (1)			impairment on held to maturity
					securities (1)
		(In thousands)
	Balance of AOCI at the beginning of the year	$	2,105		$	(369	)	$	—		$	1,736
	Other comprehensive (loss) income before reclassification	(63		)	105			(34		)	8
	Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	—			—			—			—
	Net current period other comprehensive (loss) income	(63		)	105			(34		)	8
	Balance of AOCI at the end of the year	$	2,042		$	(264	)	$	(34	)	$	1,744
	-1	All amounts are net of tax.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair value measurements of assets on a recurring basis	The following tables summarize the balances of assets measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013.
		December 31, 2014
		Total		Level 1			Level 2		Level 3
		(In thousands)
	Investment securities available for sale:
	U.S. Treasury and U.S. Government-sponsored agencies	$	21,427	$	—		$	21,427	$	—
	Municipal securities	173,037		—			173,037		—
	Mortgage backed securities and collateralized mortgage obligations—residential:
	U.S Government-sponsored agencies	542,399		—			542,399		—
	Corporate obligations	4,010		—			4,010		—
	Mutual funds and other equities	1,973		1,973			—		—
	Total	$	742,846	$	1,973		$	740,873	$	—
		December 31, 2013
		Total		Level 1			Level 2		Level 3
		(In thousands)
	Investment securities available for sale:
	U.S. Treasury and U.S. Government-sponsored agencies	$	6,039	$	—		$	6,039	$	—
	Municipal securities	49,060		—			49,060		—
	Mortgage backed securities and collateralized mortgage obligations—residential:
	U.S Government-sponsored agencies	108,035		—			108,035		—
	Total	$	163,134	$	—		$	163,134	$	—
Fair value measurements of assets on a nonrecurring basis	The tables below represent assets measured at fair value on a nonrecurring basis at December 31, 2014 and December 31, 2013 and the net losses (gains) recorded in earnings during years ended December 31, 2014 and 2013.
		Basis (1)		Fair Value at December 31, 2014
				Total			Level 1		Level 2		Level 3		Net Losses
													(Gains)
													Recorded in
													Earnings
													During
													the Year Ended December 31, 2014
		(In thousands)
	Noncovered impaired loans:
	Commercial business:
	Commercial and industrial	$	161	$	138		$	—	$	—	$	138	$	23
	Total commercial business	161		138			—		—		138		23
	Real estate construction and land development:
	One-to-four family residential	2,094		1,725			—		—		1,725		350
	Total real estate construction and land development	2,094		1,725			—		—		1,725		350
	Consumer	49		45			—		—		45		5
	Total noncovered impaired loans	2,304		1,908			—		—		1,908		378
	Investment securities held to maturity:
	Mortgage back securities and collateralized mortgage obligations—residential:
	Private residential collateralized mortgage obligations	36		11			—		11		—		45
	Total	$	2,340	$	1,919		$	—	$	11	$	1,908	$	423
	-1	Basis represents the unpaid principal balance of noncovered impaired loans and amortized cost of investment securities held to maturity.
		Basis (1)		Fair Value at December 31, 2013
				Total			Level 1		Level 2		Level 3		Net Losses
													(Gains)
													Recorded in
													Earnings
													During
													the Year Ended December 31, 2013
		(In thousands)
	Noncovered impaired loans:
	Commercial business:
	Commercial and industrial	$	4,850	$	2,134		$	—	$	—	$	2,134	$	1,681
	Owner-occupied commercial real estate	1,880		1,285			—		—		1,285		594
	Non-owner occupied commercial real estate	4,123		3,759			—		—		3,759		(2,409		)
	Total commercial business	10,853		7,178			—		—		7,178		(134		)
	One-to-four family residential	—		—			—		—		—		—
	Real estate construction and land development:
	One-to-four family residential	911		700			—		—		700		211
	Total real estate construction and land development	911		700			—		—		700		211
	Consumer	678		525			—		—		525		153
	Total noncovered impaired loans	12,442		8,403			—		—		8,403		230
	Covered impaired loans:
	Commercial business:
	Commercial and industrial	3,751		3,122			—		—		3,122		628
	Non-owner occupied commercial real estate	—		—			—		—		—		—
	Total commercial business	3,751		3,122			—		—		3,122		628
	One-to-four family residential	450		419			—		—		419		(13		)
	Consumer	—		—			—		—		—		(2		)
	Total covered impaired loans	4,201		3,541			—		—		3,541		613
	Investment securities held to maturity:
	Mortgage back securities and collateralized mortgage obligations – residential:
	Private residential collateralized mortgage obligations	19		19			—		19		—		38
	Other real estate owned:
	Commercial properties	1,720		1,222			—		—		1,222		348
	Total	$	18,382	$	13,185		$	—	$	19	$	13,166	$	1,229
	-1	Basis represents the unpaid principal balance of noncovered impaired and covered impaired loans, amortized cost of investment securities held to maturity, and carrying value at ownership date of other real estate owned.
Fair value measurements for financial instruments measured at fair value on a non-recurring basis	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2014 and December 31, 2013.
		December 31, 2014
		Fair		Valuation		Unobservable Input(s)	Range of Inputs; Weighted
		Value		Technique(s)			Average
		(Dollars in thousands)
	Noncovered impaired loans	$	1,908	Market approach		Adjustment for differences between the comparable sales	(47.5%) - 96.2%; 7.0%
		December 31, 2013
		Fair		Valuation		Unobservable Input(s)	Range of Inputs; Weighted
		Value		Technique(s)			Average
		(Dollars in thousands)
	Noncovered impaired loans	$	8,403	Market approach		Adjustment for differences between the comparable sales	(27.8%) - 19.1%; (6.6%)
	Covered impaired loans	$	3,541	Market approach		Adjustment for differences between the comparable sales	(50.0%) - (25.0%); (35.0%)
	Other real estate owned	$	1,222	Market approach		Adjustment for differences between the comparable sales	(60.1)% - 13.6%; (35.2%)
Schedule of carrying value and fair value of financial instruments	The tables below present the carrying value amount of the Company’s financial instruments and their corresponding estimated fair values at the dates indicated.
		December 31, 2014
		Carrying Value		Fair Value			Fair Value Measurements Using:
							Level 1		Level 2		Level 3
		(In thousands)
	Financial Assets:
	Cash and cash equivalents	$	121,636	$	121,636		$	121,636	$	—	$	—
	Other interest earning deposits	10,126		10,145			—		10,145		—
	Investment securities available for sale	742,846		742,846			1,973		740,873		—
	Investment securities held to maturity	35,814		36,874			—		36,874		—
	Federal Home Loan Bank stock	12,188		N/A			N/A		N/A		N/A
	Loans held for sale	5,582		5,710			—		5,710		—
	Loans receivable, net of allowance for loan losses	2,223,348		2,279,081			—		—		2,279,081
	Accrued interest receivable	9,836		9,836			3		3,009		6,824
	Financial Liabilities:
	Deposits:
	Noninterest deposits, NOW accounts, money market accounts and savings accounts	$	2,380,934	$	2,380,934		$	2,380,934	$	—	$	—
	Certificate of deposit accounts	525,397		525,768			—		525,768		—
	Total deposits	$	2,906,331	$	2,906,702		$	2,380,934	$	525,768	$	—
	Securities sold under agreement to repurchase	$	32,181	$	32,181		$	32,181	$	—	$	—
	Junior subordinated debentures	19,082		19,082			—		—		19,082
	Accrued interest payable	411		411			62		328		21
		December 31, 2013
		Carrying Value		Fair Value			Fair Value Measurements Using:
							Level 1		Level 2		Level 3
		(In thousands)
	Financial Assets:
	Cash and cash equivalents	$	130,400	$	130,400		$	130,400	$	—	$	—
	Other interest earning deposits	15,662		15,747			—		15,747		—
	Investment securities available for sale	163,134		163,134			—		163,134		—
	Investment securities held to maturity	36,154		36,340			—		36,340		—
	Federal Home Loan Bank stock	5,741		N/A			N/A		N/A		N/A
	Loans receivable, net of allowance	1,203,096		1,218,192			—		—		1,218,192
	Accrued interest receivable	5,462		5,462			26		910		4,526
	Financial Liabilities:
	Deposits:
	Noninterest deposits, NOW accounts, money market accounts and savings accounts	$	1,089,759	$	1,089,759		$	1,089,759	$	—	$	—
	Certificate of deposit accounts	309,430		311,065			—		311,065		—
	Total deposits	$	1,399,189	$	1,400,824		$	1,089,759	$	311,065	$	—
	Securities sold under agreement to repurchase	$	29,420	$	29,420		$	29,420	$	—	$	—
	Accrued interest payable	152		152			17		135		—

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Schedule of stock option activity	The following tables summarize the stock option activity for the years ended December 31, 2014, 2013 and 2012:
		Shares		Weighted-Average Exercise Price		Weighted-Average	Aggregate
						Remaining	Intrinsic
						Contractual	Value (In
						Term (In years)	thousands)
	Outstanding at December 31, 2011	417,123		$	18.33
	Granted	—		—
	Exercised	(11,365	)	11.35
	Forfeited or expired	(105,100	)	21.52
	Outstanding at December 31, 2012	300,658		17.48
	Granted	—		—
	Exercised	(16,553	)	12.1
	Forfeited or expired	(89,623	)	22.07
	Outstanding at December 31, 2013	194,482		15.82
	Granted (1)	90,248		10.72
	Exercised	(84,189	)	10.86
	Forfeited or expired	(44,134	)	22.76
	Outstanding at December 31, 2014	156,407		$	13.59	2.63	$	647
	Vested and expected to vest at December 31, 2014	156,407		$	13.59	2.63	$	647
	Exercisable at December 31, 2014	156,407		$	13.59	2.63	$	647
	-1	Options granted during the year ended December 31, 2014 represent the stock options issued in conjunction with the Washington Banking Merger. See "Note 2. Business Combinations" for additional information. The weighted average exercise price reflects the exchange ratio applied to the original Washington Banking exercise price pursuant to the Merger Agreement.
Schedule of restricted stock award activity	The following tables summarize the restricted and unrestricted stock award activity for the years ended December 31, 2014, 2013 and 2012:
		Shares		Weighted-Average Grant Date Fair Value
	Nonvested at December 31, 2011	164,880		$	16.29
	Granted	91,738		14.02
	Vested	(61,445	)	17.41
	Forfeited	(5,503	)	15.21
	Nonvested at December 31, 2012	189,670		14.86
	Granted	103,195		14.31
	Vested	(86,819	)	15.55
	Forfeited	(3,107	)	14.89
	Nonvested at December 31, 2013	202,939		14.29
	Granted	130,548		16.03
	Vested	(85,373	)	14.37
	Forfeited	(9,445	)	14.67
	Nonvested at December 31, 2014	238,669		$	15.2

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	Income tax expense for the years ended December 31, 2014, 2013 and 2012 consisted of the following:
			Years Ended December 31,
			2014			2013			2012
			(In thousands)
	Current tax expense		$	9,992		$	4,344		$	5,916
	Deferred tax (benefit) expense		(3,087		)	326			185
	(Decrease) increase in valuation allowance		—			(77		)	77
	Income tax expense		$	6,905		$	4,593		$	6,178
Income tax expense (benefit) the Federal statutory income tax rate	A reconciliation of the Company's effective income tax rate with the Federal statutory income tax rate of 35% is as follows:
			Years Ended December 31,
			2014			2013			2012
			(In thousands)
	Income tax expense at Federal statutory rate		$	9,772		$	4,959		$	6,804
	Tax-exempt instruments		(1,598		)	(858		)	(649		)
	Non-deductible acquisition costs		373			469			—
	Federal tax credits (1)		(812		)	—			—
	Effects of BOLI		(159		)	(25		)	(28		)
	Tax position resolution (2)		(728		)	—			—
	Valuation allowance		—			(77		)	77
	Other, net		57			125			(26		)
	Income tax expense		$	6,905		$	4,593		$	6,178
	-1	Federal tax credits are provided for under the New Market Tax Credit program. A subsidiary of Heritage Bank was awarded an allocation of New Market Tax Credit investments consisting of three tranches totaling $25.0 million. Gross tax credits related to these tranches totaling $9.8 million are available through 2020. The subsidiary is required to fund 85 percent of a tranche to claim the entire tax credit, and it has until May 15, 2015 to complete the funding. Tax benefits related to these credits were recognized for financial reporting purposes in the same period that the credits were recognized in the Company's income tax returns. The Company has analyzed the three tranches and believes that it is more likely than not that all tranches will be funded to 85 percent by May 15, 2015. The Company believes that these tax credits will be realized and therefore has reflected the impact of these credits in its estimated annual effective tax rate for 2014.
	-2	Washington Banking Company had recorded a liability for certain tax positions prior to the merger effective date, which the Company assumed as part of the Washington Banking Merger. These tax positions were resolved as of December 31, 2014, resulting in a decrease of the Company's income tax expense for the year ended December 31, 2014.
Deferred income tax asset (liability)	The following table presents major components of the deferred income tax asset (liability) resulting from differences between financial reporting and tax basis:
			December 31, 2014			December 31, 2013
			(In thousands)
	Deferred tax assets:
	Allowance for loan losses		$	5,460		$	7,003
	Accrued compensation		1,382			821
	Stock compensation		818			524
	Capital loss carryforward		30			95
	Unrealized losses charged to earnings on other than temporarily impaired investment securities		338			622
	Net unrealized losses charged to other comprehensive income on securities		—			626
	Goodwill and other intangible assets		—			2,107
	Market discount on purchased loans		17,949			6,767
	Foregone interest on nonaccrual loans		2,337			1,026
	Net operating loss carryforward acquired from NCB		553			588
	Difference in amounts reflected in financial statements and income tax basis of certain liabilities assumed in business combinations		3,492			—
	Other deferred tax assets		1,394			705
	Total deferred tax assets		33,753			20,884
	Deferred tax liabilities:
	Deferred loan fees, net		(1,982		)	(867		)
	Premises and equipment		(1,937		)	(1,520		)
	FHLB stock		(2,768		)	(1,039		)
	Net unrealized gains charged to other comprehensive income on securities		(1,832		)	—
	Indemnification asset		(392		)	(1,539		)
	Goodwill and other intangible assets		(1,560		)	—
	Federal tax credits		(439		)	—
	Junior subordinated debentures		(2,349		)	—
	Other deferred tax liabilities		(730		)	(248		)
	Total deferred tax liabilities		(13,989		)	(5,213		)
	Deferred income tax asset, net		$	19,764		$	15,671

Regulatory_Capital_Requirement1

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Minimum capital requirements to maintain leverage ratio
		Minimum				Well-		Actual
		Requirements				Capitalized
						Requirements
		$		%		$	%	$		%
		(Dollars in thousands)
	As of December 31, 2014:
	The Company consolidated
	Tier 1 leverage capital to average assets	$	132,881	4	%	N/A	N/A	$	340,292	10.2	%
	Tier 1 capital to risk-weighted assets	97,620		4		N/A	N/A	340,292		13.9
	Total capital to risk-weighted assets	195,240		8		N/A	N/A	368,198		15.1
	Heritage Bank
	Tier 1 leverage capital to average assets	132,853		4		166,066	5	332,147		10
	Tier 1 capital to risk-weighted assets	97,585		4		146,378	6	332,147		13.6
	Total capital to risk-weighted assets	195,171		8		243,964	10	360,053		14.8
	As of December 31, 2013:
	The Company consolidated
	Tier 1 leverage capital to average assets	$	65,847	4	%	N/A	N/A	$	185,951	11.3	%
	Tier 1 capital to risk-weighted assets	47,853		4		N/A	N/A	185,951		15.5
	Total capital to risk-weighted assets	95,706		8		N/A	N/A	201,076		16.8
	Heritage Bank
	Tier 1 leverage capital to average assets	65,831		4		82,288	5	182,543		11.1
	Tier 1 capital to risk-weighted assets	47,807		4		71,710	6	182,543		15.3
	Total capital to risk-weighted assets	95,613		8		119,517	10	197,656		16.5

Heritage_Financial_Corporation1

Heritage Financial Corporation (Parent Only) (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Statements of Financial Condition	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Financial Condition
		December 31, 2014			December 31, 2013
		(In thousands)
	ASSETS
	Cash and interest earning deposits	$	8,835		$	2,645
	Investment in subsidiary bank	465,442			212,354
	Other assets	863			1,041
		$	475,140		$	216,040
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Junior subordinated debentures	$	19,082		$	—
	Other liabilities	1,552			278
	Total stockholders’ equity	454,506			215,762
		$	475,140		$	216,040
Condensed Statements of Income	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Income
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Interest income:
	Interest earning deposits and other assets	$	17		$	22		$	44
	ESOP loan	—			—			8
	Total interest income	17			22			52
	Interest expense:
	Junior subordinated debentures	458			—			—
	Total interest expense	458			—			—
	Net interest (expense) income	(441		)	22			52
	Noninterest income:
	Dividends from subsidiary banks	66,300			26,000			14,100
	Equity in (excess distributed) undistributed income of subsidiary banks	(40,737		)	(13,001		)	962
	Other income	3			—			—
	Total noninterest income	25,566			12,999			15,062
	Noninterest expense:
	Professional services	2,943			1,718			—
	Other expense	3,109			2,905			2,766
	Total noninterest expense	6,052			4,623			2,766
	Income before income taxes	19,073			8,398			12,348
	Income tax benefit	(1,941		)	(1,177		)	(913		)
	Net income	$	21,014		$	9,575		$	13,261
Condensed Statements of Cash Flow	HERITAGE FINANCIAL CORPORATION
	(PARENT COMPANY ONLY)
	Condensed Statements of Cash Flows
		Years Ended December 31,
		2014			2013			2012
		(In thousands)
	Cash flows from operating activities:
	Net income	$	21,014		$	9,575		$	13,261
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in excess distributed (undistributed) income of subsidiary bank	40,737			13,001			(962		)
	Tax (benefit) provision realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	(112		)	13			93
	Recognition of compensation related to ESOP shares and share based payment	1,395			1,223			1,185
	Stock option compensation expense	20			71			106
	Net change in other assets and liabilities	811			(489		)	7
	Net cash provided by operating activities	63,865			23,394			13,690
	Cash flows from investing activities:
	ESOP loan principal repayments	—			—			161
	Investment in subsidiary	(43,215		)	(21,666		)	—
	Net cash (used in) provided by investing activities	(43,215		)	(21,666		)	161
	Cash flows from financing activities:
	Common stock cash dividends paid	(12,892		)	(6,672		)	(12,155		)
	Proceeds from exercise of stock options	921			176			129
	Tax benefit (provision) realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	112			(13		)	(93		)
	Repurchase of common stock	(2,601		)	(8,825		)	(6,023		)
	Net cash used in financing activities	(14,460		)	(15,334		)	(18,142		)
	Net increase (decrease) in cash and cash equivalents	6,190			(13,606		)	(4,291		)
	Cash and cash equivalents at beginning of year	2,645			16,251			20,542
	Cash and cash equivalents at end of year	$	8,835		$	2,645		$	16,251

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Results of operations on a quarterly basis	Results of operations on a quarterly basis were as follows:
		Year Ended December 31, 2014
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
		(Dollars in thousands, except per share amounts)
	Interest income	$	17,613	$	30,023	$	35,031	$	38,439
	Interest expense	872		1,426		1,724		1,659
	Net interest income	16,741		28,597		33,307		36,780
	Provision for loan losses	458		691		594		2,851
	Net interest income after provision for loan losses	16,283		27,906		32,713		33,929
	Noninterest income	2,307		4,780		5,483		3,897
	Noninterest expense	14,779		26,994		28,363		29,243
	Income before provision for income taxes	3,811		5,692		9,833		8,583
	Income tax expense	1,268		1,544		2,765		1,328
	Net income	$	2,543	$	4,148	$	7,068	$	7,255
	Basic earnings per common share	$	0.16	$	0.16	$	0.23	$	0.24
	Diluted earnings per common share	0.16		0.16		0.23		0.24
	Cash dividends declared on common stock	0.16		—		0.09		0.25
		Year Ended December 31, 2013
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
		(Dollars in thousands, except per share amounts)
	Interest income	$	17,484	$	16,859	$	18,533	$	18,552
	Interest expense	946		919		952		907
	Net interest income	16,538		15,940		17,581		17,645
	Provision for loan losses	858		1,308		1,078		428
	Net interest income after provision for loan losses	15,680		14,632		16,503		17,217
	Noninterest income	2,282		2,357		2,582		2,430
	Noninterest expense	13,719		13,007		14,285		18,504
	Income before provision for income taxes	4,243		3,982		4,800		1,143
	Income tax expense	1,358		1,292		1,510		433
	Net income	$	2,885	$	2,690	$	3,290	$	710
	Basic earnings per common share	$	0.19	$	0.18	$	0.2	$	0.04
	Diluted earnings per common share	0.19		0.18		0.2		0.04
	Cash dividends declared on common stock	0.08		0.08		0.18		0.08

Description_of_Business_Basis_2

Description of Business, Basis of Presentation and Significant Accounting Policies and Recent Issued Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 31, 1998	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	1-May-14	Jan. 31, 1998
		Segment
Business Description and Basis of Presentation [Line Items]
Allowance for off-balance sheet financial instruments		$170,000	$110,000
Commitments to sell mortgage loans			0
Percentage of losses to be absorbed by the FDIC		80.00%
Percentage of loss recoveries received by FDIC		80.00%
Associated derivative		0	0
Bank owned life insurance		35,176,000	2,193,000		32,500,000
Percentage of issued shares purchased by the Plan	2.00%
ESOP loan to fund the purchase of the Company's common stock	$1,300,000					$1,300,000
Receivables loan term				15 years
Receivable effective interest rate				8.50%
Stock option awards granted (in shares)		0	0	0
Number of reportable segments		1
Buildings and building improvements | Minimum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		15 years
Buildings and building improvements | Maximum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		39 years
Furniture, fixtures and equipment | Minimum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		3 years
Furniture, fixtures and equipment | Maximum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		7 years
Heritage Bank
Business Description and Basis of Presentation [Line Items]
Number of branches operating		66

Business_Combinations_Narrativ

Business Combinations (Narrative) (Details) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

Sep. 30, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

1-May-14

Jul. 15, 2013

Jan. 09, 2013

Sep. 14, 2012

Apr. 30, 2014

Jul. 14, 2013

Jan. 08, 2013

Acquisitions

Branch

Branch

Business Acquisition [Line Items]

Number of acquisitions completed

0

Goodwill, other changes

$118,000

$722,000

Adjustment to goodwill related to bank owned life insurance obligation

265,000

Adjustment to goodwill related to loan discount correction

489,000

Adjustment to goodwill related to FDIC indemnification update

233,000

Adjustment to goodwill related to FDIC receivable update

252,000

Adjustment to goodwill related to deferred tax impact of other adjustments

342,000

252,000

Adjustment to goodwill related to correction in stock issuance costs

489,000

Stock issuance costs in connection with business combinations

489,000

0

0

Goodwill

119,029,000

29,365,000

Bargain purchase gain on bank acquisition

0

399,000

0

Whidbey Island Bank

Business Acquisition [Line Items]

Number of acquired branches to operate under legacy name

6

Washington Banking

Business Acquisition [Line Items]

Common stock, shares outstanding of acquired entity

15,587,154

Washington Banking

Business Acquisition [Line Items]

Number of shares of common stock issued

0.89

Share price paid in cash (in usd per share)

$2.75

Closing price per share (in usd per share)

16.16

Total consideration paid

269,619,000

Business acquisition, number of shares issued

14,000,178

Capitalized stock issuance costs

489,000

Stock issuance costs in connection with business combinations

9,100,000

890,000

Cash paid

42,895,000

[1]

Goodwill

89,664,000

Valley Acquisition

Business Acquisition [Line Items]

Number of shares of common stock issued

1.3611

Business acquisition, number of shares issued

1,533,267

Capitalized stock issuance costs

157,000

Stock issuance costs in connection with business combinations

443,000

2,100,000

Number of branches operating

8

Business acquisition, price per share (in usd per share)

$19.50

Cash paid

22,000,000

Common stock issued, fair value

24,200,000

Goodwill

16,400,000

Valley Acquisition | To be Maintained

Business Acquisition [Line Items]

Number of branches operating

4

Valley Acquisition | To be Disposed

Business Acquisition [Line Items]

Number of branches operating

4

Valley Acquisition | To be Terminated

Business Acquisition [Line Items]

Number of branches operating

3

Valley Acquisition | Held-for-sale

Business Acquisition [Line Items]

Number of branches operating

1

Northwest Commercial Bank

Business Acquisition [Line Items]

Total consideration paid

2,967,000

Stock issuance costs in connection with business combinations

0

794,000

616,000

Goodwill

-399,000

Number of branches acquired

2

Redemption of preferred stock

2,000,000

Business acquisition, share price (in usd per share)

$5.50

Business acquisition, contingent cash consideration settled

491,000

Bargain purchase gain on bank acquisition

$399,000

[1]

Includes $3,000 of cash paid due to fractional shares and $27,000 of cash paid from dissenters.

Business_Combinations_Consider

Business Combinations (Consideration Transferred) (Details) (Washington Banking, USD $)	0 Months Ended
In Thousands, except Share data, unless otherwise specified	1-May-14
Business Acquisition [Line Items]
Cash paid	$42,895	[1]
Total consideration transferred	269,619
Business acquisition, number of shares issued	14,000,178
Fractional Shares
Business Acquisition [Line Items]
Cash paid	3	[1]
From Dissenters
Business Acquisition [Line Items]
Cash paid	27	[1]
Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Fair value of equity interest issued	2,092	[2]
Converted restricted stock award units	129,462
Number of shares surrendered at conversion	26,783
Restricted stock awards issued in merger, but surrendered to pay taxes	433
Stock Options
Business Acquisition [Line Items]
Fair value of equity interest issued	481
Common Stock
Business Acquisition [Line Items]
Fair value of equity interest issued	$224,151	[3]
Business acquisition, number of shares issued	13,870,716
Common Stock | Fractional Shares
Business Acquisition [Line Items]
Business acquisition, number of shares excluded from equity issued	165
Common Stock | From Dissenters
Business Acquisition [Line Items]
Business acquisition, number of shares excluded from equity issued	1,686
[1]	Includes $3,000 of cash paid due to fractional shares and $27,000 of cash paid from dissenters.
[2]	Total number of converted shares was 129,462. Fair value includes 26,783 shares which were forfeited by the Washington Banking stockholder to pay applicable taxes, totaling fair value of $433,000.
[3]	Total of 13,870,716 shares issued. Excludes 1,686 shares dissented and paid in cash and 165 fractional shares paid in cash.

Business_Combinations_Prelimin

Business Combinations (Preliminary Fair Value Estimate) (Details) (USD $)	1-May-14	Jul. 15, 2013	Jan. 09, 2013
In Thousands, unless otherwise specified
Washington Banking
Assets
Cash and cash equivalents	$74,947
Other interest earning deposits	0
Investment securities available for sale	458,312
Investment securities held to maturity	0
Loans held for sale	3,923
FDIC indemnification asset	7,174
Other real estate owned ($5,122, $0, and $0 covered by FDIC shared-loss agreements, respectively)	7,121
Premises and equipment	31,776
Federal Home Loan Bank stock	7,064
Bank owned life insurance	32,519
Accrued Interest Receivable	4,943
Other intangible assets	11,194
Prepaid expenses and other assets	14,852
Total assets acquired	1,656,853
Liabilities
Deposits	1,433,894
Junior subordinated debentures	18,937
Accrued expenses and other liabilities	24,067
Total liabilities assumed	1,476,898
Net assets acquired	179,955
Washington Banking | Noncovered Loans
Assets
Loans receivable	895,978
Washington Banking | Covered Loans
Assets
Loans receivable	107,050
Valley Bank
Assets
Cash and cash equivalents		40,643
Other interest earning deposits		13,866
Investment securities available for sale		31,444
Investment securities held to maturity		22,908
Loans held for sale		0
FDIC indemnification asset		0
Other real estate owned ($5,122, $0, and $0 covered by FDIC shared-loss agreements, respectively)		0
Premises and equipment		6,558
Federal Home Loan Bank stock		366
Bank owned life insurance		0
Accrued Interest Receivable		465
Other intangible assets		916
Prepaid expenses and other assets		3,087
Total assets acquired		237,324
Liabilities
Deposits		207,013
Junior subordinated debentures		0
Accrued expenses and other liabilities		342
Total liabilities assumed		207,355
Net assets acquired		29,969
Valley Bank | Noncovered Loans
Assets
Loans receivable		117,071
Valley Bank | Covered Loans
Assets
Loans receivable		0
Northwest Commercial Bank
Assets
Cash and cash equivalents			2,712
Other interest earning deposits			1,003
Investment securities available for sale			2,753
Investment securities held to maturity			0
Loans held for sale			0
FDIC indemnification asset			0
Other real estate owned ($5,122, $0, and $0 covered by FDIC shared-loss agreements, respectively)			2,279
Premises and equipment			214
Federal Home Loan Bank stock			88
Bank owned life insurance			0
Accrued Interest Receivable			232
Other intangible assets			156
Prepaid expenses and other assets			4,048
Total assets acquired			64,994
Liabilities
Deposits			60,442
Junior subordinated debentures			0
Accrued expenses and other liabilities			1,186
Total liabilities assumed			61,628
Net assets acquired			3,366
Northwest Commercial Bank | Noncovered Loans
Assets
Loans receivable			51,509
Northwest Commercial Bank | Covered Loans
Assets
Loans receivable			$0

Business_Combinations_Summary_

Business Combinations (Summary of Net Assets Purchased and Goodwill Recognized) (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	1-May-14	Jul. 15, 2013	Jan. 09, 2013	Dec. 31, 2014	Dec. 31, 2013
Fair value adjustments:
(Goodwill) bargain purchase gain recognized				($119,029)	($29,365)
Washington Banking
Business Acquisition [Line Items]
Cost basis of net assets on merger date	181,782
Less: Consideration transferred	-269,619
Other interest earning deposits	0
Investment securities	0
Loans held for sale	86
Fair value adjustments:
FDIC indemnification asset	357
Other real estate owned	387
Premises and equipment	-1,540
Other intangible assets	10,216
Prepaid expenses and other assets	-6,416
Deposits	-1,737
Junior subordinated debentures	6,837
Accrued expenses and other liabilities	-3,590
(Goodwill) bargain purchase gain recognized	-89,664
Washington Banking | Noncovered Loans
Fair value adjustments:
Loans receivable	-12,811
Washington Banking | Covered Loans
Fair value adjustments:
Loans receivable	6,384
Valley Bank
Business Acquisition [Line Items]
Cost basis of net assets on merger date		29,720
Less: Consideration transferred		-46,323
Other interest earning deposits		162
Investment securities		0
Loans held for sale		0
Fair value adjustments:
FDIC indemnification asset		0
Other real estate owned		0
Premises and equipment		1,837
Other intangible assets		916
Prepaid expenses and other assets		198
Deposits		-9
Junior subordinated debentures		0
Accrued expenses and other liabilities		149
(Goodwill) bargain purchase gain recognized		-16,353
Valley Bank | Noncovered Loans
Fair value adjustments:
Loans receivable		-3,003
Valley Bank | Covered Loans
Fair value adjustments:
Loans receivable		0
Northwest Commercial Bank
Business Acquisition [Line Items]
Cost basis of net assets on merger date			6,113
Less: Consideration transferred			-2,967
Other interest earning deposits			7
Investment securities			-2
Loans held for sale			0
Fair value adjustments:
FDIC indemnification asset			0
Other real estate owned			-1,301
Premises and equipment			-69
Other intangible assets			156
Prepaid expenses and other assets			2,394
Deposits			-11
Junior subordinated debentures			0
Accrued expenses and other liabilities			-622
(Goodwill) bargain purchase gain recognized			399
Northwest Commercial Bank | Noncovered Loans
Fair value adjustments:
Loans receivable			-3,299
Northwest Commercial Bank | Covered Loans
Fair value adjustments:
Loans receivable			$0

Business_Combinations_Unaudite

Business Combinations (Unaudited Pro Forma) (Details) (Washington Banking, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Washington Banking
Business Acquisition [Line Items]
Net interest income	$144,470	$147,267
Net income	$35,758	$30,718
Basic earnings per common share (in usd per share)	$1.19	$1.04
Diluted earnings per common share (in usd per share)	$1.18	$1.04

Cash_and_Cash_Equivalents_Deta

Cash and Cash Equivalents (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Cash and Cash Equivalents [Abstract]
Average required reserve balance	$46.30

Investment_Securities_Details

Investment Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities Available for Sale
Amortized Cost	$737,345	$164,553
Gross Unrealized Gains	7,215	1,707
Gross Unrealized Losses	-1,714	-3,126
Fair Value	742,846	163,134
Securities Held to Maturity
Amortized Cost	35,814	36,154
Gross Unrecognized Gains	1,249	682
Gross Unrecognized Losses	-189	-496
Total	36,874	36,340
U.S. Treasury and U.S. Government-sponsored agencies
Securities Available for Sale
Amortized Cost	21,414	6,098
Gross Unrealized Gains	44	3
Gross Unrealized Losses	-31	-62
Fair Value	21,427	6,039
Securities Held to Maturity
Amortized Cost	1,591	1,687
Gross Unrecognized Gains	167	153
Gross Unrecognized Losses	0	0
Total	1,758	1,840
Municipal securities
Securities Available for Sale
Amortized Cost	170,082	49,989
Gross Unrealized Gains	3,139	806
Gross Unrealized Losses	-184	-1,735
Fair Value	173,037	49,060
Securities Held to Maturity
Amortized Cost	22,486	24,290
Gross Unrecognized Gains	643	200
Gross Unrecognized Losses	-11	-184
Total	23,118	24,306
U.S. Government-sponsored agencies
Securities Available for Sale
Amortized Cost	539,859	108,466
Gross Unrealized Gains	4,015	898
Gross Unrealized Losses	-1,475	-1,329
Fair Value	542,399	108,035
Securities Held to Maturity
Amortized Cost	10,866	9,129
Gross Unrecognized Gains	364	144
Gross Unrecognized Losses	-74	-284
Total	11,156	8,989
Corporate obligations
Securities Available for Sale
Amortized Cost	4,034
Gross Unrealized Gains	0
Gross Unrealized Losses	-24
Fair Value	4,010
Mutual funds and other equities
Securities Available for Sale
Amortized Cost	1,956
Gross Unrealized Gains	17
Gross Unrealized Losses	0
Fair Value	1,973
Private residential collateralized mortgage obligations
Securities Held to Maturity
Amortized Cost	871	1,048
Gross Unrecognized Gains	75	185
Gross Unrecognized Losses	-104	-28
Total	$842	$1,205

Investment_Securities_Contract

Investment Securities (Contractual Maturities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities Available for Sale, Amortized Cost
Due in one year or less	$4,148
Due after one year through three years	31,547
Due after three years through five years	23,675
Due after five years through ten years	150,635
Due after ten years	525,384
Investment securities with no stated maturity	1,956
Total	737,345	164,553
Securities Available for Sale, Fair Value
Due in one year or less	4,171
Due after one year through three years	31,693
Due after three years through five years	24,104
Due after five years through ten years	151,946
Due after ten years	528,959
Investment securities with no stated maturity	1,973
Fair Value	742,846	163,134
Securities Held to Maturity, Amortized Cost
Due in one year or less	2,895
Due after one year through three years	4,336
Due after three years through five years	5,490
Due after five years through ten years	18,558
Due after ten years	4,535
Investment securities with no stated maturity	0
Total	35,814	36,154
Securities Held to Maturity, Fair Value
Due in one year or less	2,912
Due after one year through three years	4,385
Due after three years through five years	5,710
Due after five years through ten years	19,359
Due after ten years	4,508
Investment securities with no stated maturity	0
Total	$36,874	$36,340

Investment_Securities_Unrealiz

Investment Securities (Unrealized Losses) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	$213,832	$80,829
12 Months or Longer	0	12,402
Total	213,832	93,231
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses
Less than 12 Months	-1,714	-2,488
12 Months or Longer	0	-638
Total	-1,714	-3,126
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	5,307	16,047
12 Months or Longer	0	124
Total	5,307	16,171
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrecognized Losses
Less than 12 Months	-189	-473
12 Months or Longer	0	-23
Total	-189	-496
U.S. Treasury and U.S. Government-sponsored agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	3,567	3,031
12 Months or Longer	0	0
Total	3,567	3,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses
Less than 12 Months	-31	-62
12 Months or Longer	0	0
Total	-31	-62
Municipal securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	25,176	21,471
12 Months or Longer	0	4,644
Total	25,176	26,115
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses
Less than 12 Months	-184	-1,242
12 Months or Longer	0	-493
Total	-184	-1,735
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	2,196	10,967
12 Months or Longer	0	0
Total	2,196	10,967
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrecognized Losses
Less than 12 Months	-11	-184
12 Months or Longer	0	0
Total	-11	-184
U.S. Government-sponsored agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	182,970	56,327
12 Months or Longer	0	7,758
Total	182,970	64,085
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses
Less than 12 Months	-1,475	-1,184
12 Months or Longer	0	-145
Total	-1,475	-1,329
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	2,553	4,869
12 Months or Longer	0	0
Total	2,553	4,869
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrecognized Losses
Less than 12 Months	-74	-284
12 Months or Longer	0	0
Total	-74	-284
Corporate obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	2,119
12 Months or Longer	0
Total	2,119
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses
Less than 12 Months	-24
12 Months or Longer	0
Total	-24
Private residential collateralized mortgage obligations
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
Less than 12 Months	558	211
12 Months or Longer	0	124
Total	558	335
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrecognized Losses
Less than 12 Months	-104	-5
12 Months or Longer	0	-23
Total	($104)	($28)

Investment_Securities_Impairme

Investment Securities (Impairment Activity on Held to Maturity Securities) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule of other-than-temporary impairment losses investment securities
Life-to-Date Gross Other-Than-Temporary Impairments, Beginning Balance	$2,603	[1]	$2,565	[1]	$2,435	[1]
Life-to-Date Gross Other-Than-Temporary Impairments, Ending Balance	2,648	[1]	2,603	[1]	2,565	[1]
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Beginning Balance	1,152		1,152		1,100
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Ending Balance	1,152		1,152		1,152
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Beginning Balance	1,451		1,413		1,335
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Subsequent impairments	45		38		78
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Ending Balance	1,496		1,451		1,413
Subsequent impairments
Schedule of other-than-temporary impairment losses investment securities
Life-to-Date Gross Other-Than-Temporary Impairments, Subsequent impairments	45	[1]	38	[1]	130	[1]
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Subsequent impairments	0		0		52
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Subsequent impairments	$45		$38		$78
[1]	Life-to-date gross other-than-temporary impairments disclosed in this table are not reflective of subsequent recoveries, if any.

Investment_Securities_Amortize

Investment Securities (Amortized Cost and Fair Value) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	$213,441	$114,556
Fair Value	217,624	114,774
Washington and Oregon state to secure public deposits
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	150,507	80,386
Fair Value	153,785	80,881
Federal Reserve Bank and FHLB to secure borrowing arrangements
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	4,430	0
Fair Value	4,460	0
Repurchase agreements
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	43,676	34,170
Fair Value	44,457	33,893
Other securities pledged
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	14,828	0
Fair Value	$14,922	$0

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	securities	securities	securities
Investments, Debt and Equity Securities [Abstract]
Securities classified as trading	0	0
Discount interest rate (percent)	9.40%	6.40%
Average prepayment rate (percent)	6.00%	6.00%
Impairment recorded through other comprehensive income (loss)	0	0
Total carrying value of pledged securities	216,700,000	114,800,000
Private residential collateralized mortgage obligations
Investment Securities (Textual) [Abstract]
Mortgage backed securities evaluation non temporary decline number (securities)	4	8	8

Noncovered_Loans_Receivable_Lo

Noncovered Loans Receivable (Loan Origination/Risk Management) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	($27,729)	($28,824)	($28,594)	($30,915)
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	-10,553	-13,478	-9,912	-11,805
Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	-4,095	-4,049	-4,021	-2,979
Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	-5,538	-5,326	-5,369	-4,394
One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	-1,200	-1,100	-1,221	-794
Noncovered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan segments	4
Maximum percentage consumer loans (percent)	80.00%
Gross noncovered loans receivable	2,125,814	1,170,836
Net deferred loan fees	-937	-2,670
Noncovered loans receivable, net	2,124,877	1,168,166
Allowance for loan losses	-22,153	-22,657
Noncovered loans receivable, net of allowance for loan losses	2,102,724	1,145,509
Noncovered Loans | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percent of appraised value or underlying collateral mortgage (not to exceed 80%) residential loans (percent)	80.00%
Gross noncovered loans receivable	63,540	43,082
Noncovered Loans | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	1,703,842	1,017,828
Noncovered Loans | Commercial Business | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	551,343	336,540
Noncovered Loans | Commercial Business | Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	535,742	281,309
Noncovered Loans | Commercial Business | Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	616,757	399,979
Noncovered Loans | Real Estate Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	108,109	68,379
Noncovered Loans | Real Estate Construction and Land Development | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	46,749	19,724
Noncovered Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	61,360	48,655
Noncovered Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered loans receivable	$250,323	$41,547
Noncovered Loans | Minimum | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan term	15 years
Noncovered Loans | Maximum | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan term	30 years

Noncovered_Loans_Receivable_Co

Noncovered Loans Receivable (Concentrations of Credit) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Loan	Loan
Receivables [Abstract]
Concentration of loans greater than 10%	0	0
Percentage of concentrations of loans in any industry (in excess of 10%) (percent)	10.00%

Noncovered_Loans_Receivable_Cr

Noncovered Loans Receivable (Credit Quality Indicators) (Details) (Noncovered Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Pass	$1,985,381,000	$1,092,035,000
OAEM	59,368,000	26,710,000
Substandard	80,741,000	49,678,000
Doubtful	324,000	2,413,000
Total	2,125,814,000	1,170,836,000
Potential problem loans receivable	117,250,000	52,814,000
Government guaranteed potential problem loans	2,000,000	1,800,000
Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Pass	1,589,979,000	955,444,000
OAEM	55,076,000	22,034,000
Substandard	58,463,000	37,937,000
Doubtful	324,000	2,413,000
Total	1,703,842,000	1,017,828,000
Real Estate Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Pass	91,381,000	56,914,000
OAEM	3,977,000	4,159,000
Substandard	12,751,000	7,306,000
Doubtful	0	0
Total	108,109,000	68,379,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Pass	242,836,000	39,432,000
OAEM	0	248,000
Substandard	7,487,000	1,867,000
Doubtful	0	0
Total	250,323,000	41,547,000
Commercial and Industrial | Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Pass	509,483,000	304,959,000
OAEM	14,487,000	9,183,000
Substandard	27,049,000	20,849,000
Doubtful	324,000	1,549,000
Total	551,343,000	336,540,000
Owner-occupied Commercial Real Estate | Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Pass	496,234,000	269,130,000
OAEM	22,946,000	3,814,000
Substandard	16,562,000	8,365,000
Doubtful	0	0
Total	535,742,000	281,309,000
Non-owner Occupied Commercial Real Estate | Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Pass	584,262,000	381,355,000
OAEM	17,643,000	9,037,000
Substandard	14,852,000	8,723,000
Doubtful	0	864,000
Total	616,757,000	399,979,000
One-to-four Family Residential
Financing Receivable, Recorded Investment [Line Items]
Pass	61,185,000	40,245,000
OAEM	315,000	269,000
Substandard	2,040,000	2,568,000
Doubtful	0	0
Total	63,540,000	43,082,000
One-to-four Family Residential | Real Estate Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Pass	34,356,000	11,582,000
OAEM	3,977,000	4,159,000
Substandard	8,416,000	3,983,000
Doubtful	0	0
Total	46,749,000	19,724,000
Five or More Family Residential and Commercial Properties | Real Estate Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Pass	57,025,000	45,332,000
OAEM	0	0
Substandard	4,335,000	3,323,000
Doubtful	0	0
Total	$61,360,000	$48,655,000

Noncovered_Loans_Receivable_No

Noncovered Loans Receivable (Nonaccrual Loans) (Details) (Noncovered Nonaccrual Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	$7,510,000	$7,738,000
Nonaccrual originated loans guaranteed by governmental agencies	1,600,000	1,700,000
One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	0	340,000
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	4,719,000	5,675,000
Commercial Business | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	3,463,000	4,648,000
Commercial Business | Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	1,163,000	1,024,000
Commercial Business | Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	93,000	3,000
Real Estate Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	2,652,000	1,045,000
Real Estate Construction and Land Development | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	2,652,000	1,045,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross noncovered nonaccrual loans	$139,000	$678,000

Noncovered_Loans_Receivable_Pa

Noncovered Loans Receivable (Past Due Loans) (Details) (Noncovered Loans, USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	$6,329		$6,448
90 Days or Greater	4,773		7,427
Total Past Due	11,102		13,875
Current	2,114,712		1,156,961
Total	2,125,814		1,170,836
90 Days or More and Still Accruing	0	[1]	6	[1]
Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	3,654		4,462
90 Days or Greater	2,137		5,407
Total Past Due	5,791		9,869
Current	1,698,051		1,007,959
Total	1,703,842		1,017,828
90 Days or More and Still Accruing	0	[1]	6	[1]
Real Estate Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	62		1,205
90 Days or Greater	2,511		1,498
Total Past Due	2,573		2,703
Current	105,536		65,676
Total	108,109		68,379
90 Days or More and Still Accruing	0	[1]	0	[1]
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	2,413		210
90 Days or Greater	125		13
Total Past Due	2,538		223
Current	247,785		41,324
Total	250,323		41,547
90 Days or More and Still Accruing	0	[1]	0	[1]
Commercial and Industrial | Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	2,503		2,493
90 Days or Greater	1,962		4,379
Total Past Due	4,465		6,872
Current	546,878		329,668
Total	551,343		336,540
90 Days or More and Still Accruing	0	[1]	0	[1]
Owner-occupied Commercial Real Estate | Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	1,038		808
90 Days or Greater	100		849
Total Past Due	1,138		1,657
Current	534,604		279,652
Total	535,742		281,309
90 Days or More and Still Accruing	0	[1]	0	[1]
Non-owner Occupied Commercial Real Estate | Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	113		1,161
90 Days or Greater	75		179
Total Past Due	188		1,340
Current	616,569		398,639
Total	616,757		399,979
90 Days or More and Still Accruing	0	[1]	6	[1]
One-to-four Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	200		571
90 Days or Greater	0		509
Total Past Due	200		1,080
Current	63,340		42,002
Total	63,540		43,082
90 Days or More and Still Accruing	0	[1]	0	[1]
One-to-four Family Residential | Real Estate Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	62		821
90 Days or Greater	2,135		1,045
Total Past Due	2,197		1,866
Current	44,552		17,858
Total	46,749		19,724
90 Days or More and Still Accruing	0	[1]	0	[1]
Five or More Family Residential and Commercial Properties | Real Estate Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	0		384
90 Days or Greater	376		453
Total Past Due	376		837
Current	60,984		47,818
Total	61,360		48,655
90 Days or More and Still Accruing	$0	[1]	$0	[1]
[1]	Excludes PCI loans.

Noncovered_Loans_Receivable_Im

Noncovered Loans Receivable (Impaired Loans) (Details) (Noncovered Impaired Loans, USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	$6,293,000	$17,427,000
Recorded Investment With Specific Valuation Allowance	19,863,000	12,442,000
Total Recorded Investment	26,156,000	29,869,000
Unpaid Contractual Principal Balance	26,882,000	32,951,000
Related Specific Valuation Allowance	3,235,000	4,039,000
Government guarantee of originated impaired loans	2,400,000	2,900,000
Average Recorded Investment on Impaired Loans	30,768,000	31,373,000	32,982,000
Nonaccrual
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	0	0		0
Restructured Performing
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	1,200,000	1,100,000	1,000,000
Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	3,953,000	10,558,000
Recorded Investment With Specific Valuation Allowance	15,173,000	10,853,000
Total Recorded Investment	19,126,000	21,411,000
Unpaid Contractual Principal Balance	19,409,000	23,722,000
Related Specific Valuation Allowance	2,474,000	3,675,000
Average Recorded Investment on Impaired Loans	21,905,000	23,163,000	21,782,000
Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,307,000	6,177,000
Recorded Investment With Specific Valuation Allowance	4,273,000	911,000
Total Recorded Investment	6,580,000	7,088,000
Unpaid Contractual Principal Balance	7,020,000	7,830,000
Related Specific Valuation Allowance	630,000	211,000
Average Recorded Investment on Impaired Loans	7,570,000	7,076,000	9,796,000
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	33,000	100,000
Recorded Investment With Specific Valuation Allowance	172,000	678,000
Total Recorded Investment	205,000	778,000
Unpaid Contractual Principal Balance	208,000	780,000
Related Specific Valuation Allowance	56,000	153,000
Average Recorded Investment on Impaired Loans	779,000	254,000	427,000
Commercial and Industrial | Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	1,134,000	6,140,000
Recorded Investment With Specific Valuation Allowance	7,906,000	4,850,000
Total Recorded Investment	9,040,000	10,990,000
Unpaid Contractual Principal Balance	9,349,000	13,287,000
Related Specific Valuation Allowance	1,325,000	2,716,000
Average Recorded Investment on Impaired Loans	10,946,000	12,628,000	11,467,000
Owner-occupied Commercial Real Estate | Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	360,000	1,118,000
Recorded Investment With Specific Valuation Allowance	2,421,000	1,880,000
Total Recorded Investment	2,781,000	2,998,000
Unpaid Contractual Principal Balance	2,781,000	3,023,000
Related Specific Valuation Allowance	684,000	595,000
Average Recorded Investment on Impaired Loans	3,215,000	2,638,000	2,141,000
Non-owner Occupied Commercial Real Estate | Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,459,000	3,300,000
Recorded Investment With Specific Valuation Allowance	4,846,000	4,123,000
Total Recorded Investment	7,305,000	7,423,000
Unpaid Contractual Principal Balance	7,279,000	7,412,000
Related Specific Valuation Allowance	465,000	364,000
Average Recorded Investment on Impaired Loans	7,744,000	7,897,000	8,174,000
One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0	592,000
Recorded Investment With Specific Valuation Allowance	245,000	0
Total Recorded Investment	245,000	592,000
Unpaid Contractual Principal Balance	245,000	619,000
Related Specific Valuation Allowance	75,000	0
Average Recorded Investment on Impaired Loans	514,000	880,000	977,000
One-to-four Family Residential | Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,307,000	3,773,000
Recorded Investment With Specific Valuation Allowance	2,217,000	911,000
Total Recorded Investment	4,524,000	4,684,000
Unpaid Contractual Principal Balance	4,964,000	5,426,000
Related Specific Valuation Allowance	396,000	211,000
Average Recorded Investment on Impaired Loans	5,416,000	4,237,000	4,381,000
Five or More Family Residential and Commercial Properties | Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0	2,404,000
Recorded Investment With Specific Valuation Allowance	2,056,000	0
Total Recorded Investment	2,056,000	2,404,000
Unpaid Contractual Principal Balance	2,056,000	2,404,000
Related Specific Valuation Allowance	234,000	0
Average Recorded Investment on Impaired Loans	$2,154,000	$2,839,000	$5,415,000

Noncovered_Loans_Receivable_TD

Noncovered Loans Receivable (TDR Loans, Recorded Investment and Allowance) (Details) (Noncovered Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
Noncovered Loans
Financing Receivable, Modifications [Line Items]
Performing TDRs, Noncovered TDRs	$18,764,000	$22,131,000
Nonaccrual TDRs, Noncovered TDRs	5,010,000	2,634,000
Performing TDRs, Allowance for loan losses on noncovered TDRs	1,908,000	2,957,000
Nonaccrual TDRs, Allowance for loan losses on noncovered TDRs	1,033,000	191,000
Unfunded commitments related to credits classified as noncovered TDRs	$1,800,000	$4,500,000

Noncovered_Loans_Receivable_Mo

Noncovered Loans Receivable (Modified TDRs) (Details) (Noncovered Loans, Troubled Debt Restructured Loans, USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
	Contract		Contract
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	51	[1]	69	[1]
Outstanding Principal Balance	$17,309,000	[1],[2]	$13,735,000	[1],[2]
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Number of Contracts	1		3
Outstanding Principal Balance	75,000		918,000
Number of contracts with no modifications	17	[1]
Previously Reported as TDR
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Total outstanding principal balance with no prior modifications	4,700,000
Default due to Past Modified Maturity Date
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Number of Contracts	1
One-to-four Family Residential
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	0	[1]	1	[1]
Outstanding Principal Balance	0	[1],[2]	252,000	[1],[2]
Commercial Business
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	38	[1]	40	[1]
Outstanding Principal Balance	13,537,000	[1],[2]	7,299,000	[1],[2]
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Number of Contracts	1		3
Outstanding Principal Balance	75,000		918,000
Commercial Business | Commercial and Industrial
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	32	[1]	33	[1]
Outstanding Principal Balance	5,926,000	[1],[2]	6,570,000	[1],[2]
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Number of Contracts	0		3
Outstanding Principal Balance	0		918,000
Commercial Business | Owner-occupied Commercial Real Estate
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	3	[1]	5	[1]
Outstanding Principal Balance	1,063,000	[1],[2]	537,000	[1],[2]
Commercial Business | Non-owner Occupied Commercial Real Estate
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	3	[1]	2	[1]
Outstanding Principal Balance	6,548,000	[1],[2]	192,000	[1],[2]
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Number of Contracts	1		0
Outstanding Principal Balance	75,000		0
Real Estate Construction and Land Development
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	10	[1]	25	[1]
Outstanding Principal Balance	3,553,000	[1],[2]	6,043,000	[1],[2]
Real Estate Construction and Land Development | One-to-four Family Residential
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	10	[1]	24	[1]
Outstanding Principal Balance	3,553,000	[1],[2]	3,639,000	[1],[2]
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Initial advance at the time of modification	45,000		1,100,000
Total commitment amount on construction loans	190,000		4,300,000
Outstanding principal balance at the time of modification	188,000		2,500,000
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	0	[1]	1	[1]
Outstanding Principal Balance	0	[1],[2]	2,404,000	[1],[2]
Consumer
Noncovered Loans Modified as TDRs [Abstract]
Number of Contracts	3	[1]	3	[1]
Outstanding Principal Balance	219,000	[1],[2]	141,000	[1],[2]
Modified During the Year
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Related specific valuation allowance for TDRs	1,800,000
Finance Receivable Modified Subsequent Default
Noncovered Loans Modified, Subsequently Defaulted [Abstract]
Related specific valuation allowance for TDRs	$4,000		$63,000
[1]	Number of contracts and outstanding principal balance represent loans which have balances as of period end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
[2]	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bankbs recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification), except when the modification was the initial advance on a one-to-four family residential real estate construction and land development loan under a master guidance line. During the year ended December 31, 2014, the Company's initial advance at the time of modification on these construction loans totaled $45,000, the total commitment amount was $190,000 and the outstanding principal balance at December 31, 2014 was $188,000. During the year ended December 31, 2013, the Company's initial advance at the time of modification on these construction loans totaled $1.1 million, the total commitment amount was

Noncovered_Loans_Receivable_No1

Noncovered Loans Receivable (Noncovered Purchased Credit Impaired Loans) (Details) (Noncovered PCI Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	$61,909	$36,017
Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	72,422	40,228
One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,235	3,768
One-to-four Family Residential | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,269	4,055
Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	45,433	28,683
Commercial Business | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	52,993	31,979
Commercial Business | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	18,040	16,779
Commercial Business | Commercial and Industrial | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	22,144	18,193
Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	16,208	5,119
Commercial Business | Owner-occupied Commercial Real Estate | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	18,165	5,510
Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	11,185	6,785
Commercial Business | Non-owner Occupied Commercial Real Estate | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	12,684	8,276
Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	7,186	1,389
Real Estate Construction and Land Development | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	11,177	3,044
Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	4,223	32
Real Estate Construction and Land Development | One-to-four Family Residential | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	8,456	1,967
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,963	1,357
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,721	1,077
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	7,055	2,177
Consumer | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	$5,983	$1,150

Noncovered_Loans_Receivable_Ch

Noncovered Loans Receivable (Change in Accretable Yield) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		1-May-14
Noncovered PCI Loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year	$7,714,000		$7,352,000		$14,638,000
Accretion	-4,305,000		-4,402,000		-6,238,000
Disposals and other	-3,263,000		-318,000		-2,798,000
Change in accretable yield	12,426,000	[1]	5,082,000	[1]	1,750,000	[1]
Balance at the end of the year	12,572,000		7,714,000		7,352,000
Noncovered Loans | Washington Banking
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year							10,200,000
Balance at the end of the year							10,200,000
Contractual cash flows on loans acquired							75,700,000
Expected cash flows on loans acquired							59,100,000
Non-accretable difference							16,600,000
Estimated fair value of loans acquired							48,900,000
Noncovered Loans | Non-PCI Loans | Washington Banking
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Contractual cash flows on loans acquired							1,120,000,000
Expected cash flows on loans acquired							1,060,000,000
Non-accretable difference							53,500,000
Estimated fair value of loans acquired							841,300,000
Credit card loans acquired in the merger							$5,800,000
[1]	Includes accretable difference at acquisition.

Noncovered_Loans_Receivable_Re

Noncovered Loans Receivable (Related Party) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance outstanding at beginning of period	$7,474,000	$11,442,000	$10,391,000
Principal additions	23,000	0	8,906,000
Principal reductions	-191,000	-923,000	-7,855,000
Elimination of outstanding loan balance due to change in related party status		-3,045,000
Additional of outstanding loan balance due to change in related party status	1,858,000
Balance outstanding at end of period	9,164,000	7,474,000	11,442,000
Unfunded commitments	228,000	184,000
Borrowings from related parties	$0	$0

Noncovered_Loans_Receivable_Mo1

Noncovered Loans Receivable (Mortgage Banking Loans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Loans held for sale at lower of cost or market	$5,582,000		$0
Commitments to sell mortgage loans			0
Servicing fee income	260,000		106,000		139,000
Mortgage Receivable [Member]
Mortgage Loans on Real Estate [Line Items]
Loans held for sale at lower of cost or market	5,582,000		0
One-to-four family residential loans sold during the year	55,997,000		8,460,000
Commitments to sell mortgage loans	10,625,000		0
Commitments to fund mortgage loans (at interest rates approximating market rates), Fixed rate	8,467,000		0
Commitments to fund mortgage loans (at interest rates approximating market rates), Variable or adjustable rate	2,158,000		0
SBA Loans [Member]
Mortgage Loans on Real Estate [Line Items]
SBA loans serviced for others with participating interest	77,233,000	[1]	26,854,000	[1]
SBA loans serviced for others with no participating interest	0		0
Participating interest owned by the Bank	$29,000,000		$9,400,000
[1]	Represents the gross balance of the loan at year end. The participation owned by the Bank totaled $29.0 million and $9.4 million, respectively, at December 31, 2014 and 2013 and is included in the balance of noncovered loans receivable on the Company's Consolidated Statements of Financial Condition.

Covered_Loans_Receivable_Risk_

Covered Loans Receivable (Risk Management) (Details) (Covered Loans, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan segments	4
Covered loans receivable, net	$126,200	$63,754
Allowance for loan losses	-5,576	-6,167
Covered loans receivable, net	120,624	57,587
Recorded investment of purchased covered loans no longer covered under FDIC loss sharing agreements	872	2,600
One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	5,990	4,777
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	105,233	53,681
Commercial Business | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	19,110	14,690
Commercial Business | Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	59,244	24,366
Commercial Business | Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	26,879	14,625
Real Estate Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	6,006	1,556
Real Estate Construction and Land Development | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	2,446	1,556
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	3,560	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	$8,971	$3,740

Covered_Loans_Receivable_Credi

Covered Loans Receivable (Credit Quality Indicators) (Details) (Covered Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Pass	$77,690	$44,687
OAEM	5,553	7,248
Substandard	40,370	7,573
Doubtful	2,587	4,246
Total	126,200	63,754
One-to-four Family Residential
Financing Receivable, Recorded Investment [Line Items]
Pass	5,414	3,739
OAEM	425	882
Substandard	151	156
Doubtful		0
Total	5,990	4,777
Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Pass	61,310	37,134
OAEM	5,128	6,260
Substandard	36,208	6,041
Doubtful	2,587	4,246
Total	105,233	53,681
Commercial Business | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Pass	11,297	9,516
OAEM	131	3,887
Substandard	5,442	702
Doubtful	2,240	585
Total	19,110	14,690
Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Pass	40,357	21,084
OAEM	4,957	2,318
Substandard	13,583	708
Doubtful	347	256
Total	59,244	24,366
Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Pass	9,656	6,534
OAEM	40	55
Substandard	17,183	4,631
Doubtful	0	3,405
Total	26,879	14,625
Real Estate Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Pass	3,936	698
OAEM	0	0
Substandard	2,070	858
Doubtful	0	0
Total	6,006	1,556
Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Recorded Investment [Line Items]
Pass	2,178	698
OAEM	0	0
Substandard	268	858
Doubtful	0	0
Total	2,446	1,556
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Financing Receivable, Recorded Investment [Line Items]
Pass	1,758	0
OAEM	0	0
Substandard	1,802	0
Doubtful	0	0
Total	3,560	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Pass	7,030	3,116
OAEM	0	106
Substandard	1,941	518
Doubtful	0	0
Total	$8,971	$3,740

Covered_Loans_Receivable_Nonac

Covered Loans Receivable (Nonaccrual Loans) (Details) (Covered Nonaccrual Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	$4,062	$7
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	3,877	0
Commercial Business | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	2,321	0
Commercial Business | Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	1,132	0
Commercial Business | Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	424	0
Real Estate Construction and Land Development [Member] | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	179	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross covered nonaccrual loans	$6	$7

Covered_Loans_Receivable_Past_

Covered Loans Receivable (Past Due Loans) (Details) (Covered Loans, USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	$5,173		$1,147
90 Days or Greater	5,336		5,565
Total Past Due	10,509		6,712
Current	115,691		57,042
Total	126,200		63,754
90 Days or More and Still Accruing	0	[1]	0	[1]
One-to-four Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	112		113
90 Days or Greater	0		0
Total Past Due	112		113
Current	5,878		4,664
Total	5,990		4,777
90 Days or More and Still Accruing	0	[1]	0	[1]
Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	4,620		754
90 Days or Greater	4,299		4,843
Total Past Due	8,919		5,597
Current	96,314		48,084
Total	105,233		53,681
90 Days or More and Still Accruing	0	[1]	0	[1]
Commercial Business | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	2,262		726
90 Days or Greater	1,163		1,156
Total Past Due	3,425		1,882
Current	15,685		12,808
Total	19,110		14,690
90 Days or More and Still Accruing	0	[1]	0	[1]
Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	645		28
90 Days or Greater	2,680		147
Total Past Due	3,325		175
Current	55,919		24,191
Total	59,244		24,366
90 Days or More and Still Accruing	0	[1]	0	[1]
Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	1,713		0
90 Days or Greater	456		3,540
Total Past Due	2,169		3,540
Current	24,710		11,085
Total	26,879		14,625
90 Days or More and Still Accruing	0	[1]	0	[1]
Real Estate Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	178		213
90 Days or Greater	310		644
Total Past Due	488		857
Current	5,518		699
Total	6,006		1,556
90 Days or More and Still Accruing	0	[1]	0	[1]
Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	178		213
90 Days or Greater	90		644
Total Past Due	268		857
Current	2,178		699
Total	2,446		1,556
90 Days or More and Still Accruing	0	[1]	0	[1]
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	0		0
90 Days or Greater	220		0
Total Past Due	220		0
Current	3,340		0
Total	3,560		0
90 Days or More and Still Accruing	0	[1]	0	[1]
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days	263		67
90 Days or Greater	727		78
Total Past Due	990		145
Current	7,981		3,595
Total	8,971		3,740
90 Days or More and Still Accruing	$0	[1]	$0	[1]
[1]	Excludes covered PCI loans.

Covered_Loans_Receivable_Impai

Covered Loans Receivable (Impaired Loans) (Details) (Covered Impaired Loans, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	$2,240,000	$17,000
Recorded Investment With Specific Valuation Allowance	1,835,000	4,201,000
Total Recorded Investment	4,075,000	4,218,000
Unpaid Contractual Principal Balance	5,482,000	4,192,000
Related Specific Valuation Allowance	423,000	660,000
Average Recorded Investment on Impaired Loans	4,092,000	1,963,000	234,000
Nonaccrual
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	0	0	0
Restructured Performing
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	5,000	16,000	7,000
One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance		0
Recorded Investment With Specific Valuation Allowance		450,000
Total Recorded Investment		450,000
Unpaid Contractual Principal Balance		423,000
Related Specific Valuation Allowance		31,000
Average Recorded Investment on Impaired Loans	90,000	459,000	187,000
Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,240,000	10,000
Recorded Investment With Specific Valuation Allowance	1,650,000	3,751,000
Total Recorded Investment	3,890,000	3,761,000
Unpaid Contractual Principal Balance	5,292,000	3,761,000
Related Specific Valuation Allowance	370,000	629,000
Average Recorded Investment on Impaired Loans	3,959,000	1,484,000	21,000
Commercial Business | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,240,000	10,000
Recorded Investment With Specific Valuation Allowance	94,000	3,751,000
Total Recorded Investment	2,334,000	3,761,000
Unpaid Contractual Principal Balance	3,696,000	3,761,000
Related Specific Valuation Allowance	9,000	629,000
Average Recorded Investment on Impaired Loans	3,421,000	1,484,000	21,000
Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	1,132,000
Total Recorded Investment	1,132,000
Unpaid Contractual Principal Balance	1,156,000
Related Specific Valuation Allowance	295,000
Average Recorded Investment on Impaired Loans	367,000	0	0
Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	424,000
Total Recorded Investment	424,000
Unpaid Contractual Principal Balance	440,000
Related Specific Valuation Allowance	66,000
Average Recorded Investment on Impaired Loans	171,000	0	0
Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	179,000
Total Recorded Investment	179,000
Unpaid Contractual Principal Balance	182,000
Related Specific Valuation Allowance	51,000
Average Recorded Investment on Impaired Loans	36,000	0	0
Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	179,000
Total Recorded Investment	179,000
Unpaid Contractual Principal Balance	182,000
Related Specific Valuation Allowance	51,000
Average Recorded Investment on Impaired Loans	36,000	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0	7,000
Recorded Investment With Specific Valuation Allowance	6,000	0
Total Recorded Investment	6,000	7,000
Unpaid Contractual Principal Balance	8,000	8,000
Related Specific Valuation Allowance	2,000	0
Average Recorded Investment on Impaired Loans	$7,000	$20,000	$26,000

Covered_Loans_Receivable_Troub

Covered Loans Receivable (Troubled Debt Restructured Loans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
	contract		contract
Covered Loans
Financing Receivable, Modifications [Line Items]
Performing TDRs, Covered TDRs	$10,289,000		$4,211,000
Nonaccrual TDRs, Covered TDRs	2,246,000		7,000
Performing TDRs, Allowance for loan losses on covered TDRs	1,000		660,000
Nonaccrual TDRs, Allowance for loan losses on covered TDRs	2,000		0
Covered Loans | Troubled Debt Restructured Loans
Financing Receivable, Modifications [Line Items]
Unfunded commitments related to credits classified as covered TDRs	0		0
Number of Contracts	12	[1]	3	[1]
Outstanding Principal Balance	12,516,000	[1],[2]	3,792,000	[1],[2]
Number of loans modified that subsequently defaulted	0		0
Covered Loans | Troubled Debt Restructured Loans | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	[1]
Related specific valuation allowance for TDRs	0
Covered Loans | Troubled Debt Restructured Loans | One-to-four Family Residential
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	[1]	0	[1]
Outstanding Principal Balance	0	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			2	[1]
Outstanding Principal Balance			13,000
Related specific valuation allowance for TDRs	1,000
Covered Loans | Troubled Debt Restructured Loans | Commercial Business
Financing Receivable, Modifications [Line Items]
Number of Contracts	11		3	[1]
Outstanding Principal Balance	12,088,000		3,792,000	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Commercial Business | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts	7	[1]	3	[1]
Outstanding Principal Balance	3,394,000	[1],[2]	3,792,000	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	[1]	0	[1]
Outstanding Principal Balance	1,133,000	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	[1]	0	[1]
Outstanding Principal Balance	7,561,000	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Real Estate Construction and Land Development
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	[1]	0	[1]
Outstanding Principal Balance	428,000	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	[1]	0	[1]
Outstanding Principal Balance	0	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	[1]	0	[1]
Outstanding Principal Balance	428,000	[1],[2]	0	[1],[2]
Covered Loans | Troubled Debt Restructured Loans | Consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	[1]	0	[1]
Outstanding Principal Balance	0	[1],[2]	0	[1],[2]
Purchased Impaired Covered Loans [Member] | Troubled Debt Restructured Loans | Washington Banking
Financing Receivable, Modifications [Line Items]
Number of Contracts	11	[1]
Outstanding Principal Balance	10,300,000
Related specific valuation allowance for TDRs	0
Purchased Impaired Covered Loans [Member] | Troubled Debt Restructured Loans | Payment Deferral
Financing Receivable, Modifications [Line Items]
Number of Contracts	4	[1]
Outstanding Principal Balance	7,700,000
Purchased Impaired Covered Loans [Member] | Troubled Debt Restructured Loans | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Outstanding Principal Balance	$2,200,000
[1]	Number of contracts and outstanding principal balance represent loans which have balances as of year end as certain loans may have been paid-down or charged-off during the years ended December 31, 2014 and 2013.
[2]	Includes subsequent payments after modifications and reflects the balance as of period end. As the Bank did not forgive any principal or interest balance as part of the loan modification, the Bankbs recorded investment in each loan at the date of modification (pre-modification) did not change as a result of the modification (post-modification).

Covered_Loans_Receivable_Cover

Covered Loans Receivable (Covered Purchased Credit Impaired Loans) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]
Recorded investment balance which are no longer covered under the FDIC shared-loss agreements	$476	$1,700
Covered Loans
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	57,362	38,876
Covered Loans | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	62,338	40,043
Covered Loans | One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	3,478	3,530
Covered Loans | One-to-four Family Residential | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	3,837	3,966
Covered Loans | Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	48,057	31,790
Covered Loans | Commercial Business | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	53,313	32,757
Covered Loans | Commercial Business | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	7,134	8,680
Covered Loans | Commercial Business | Commercial and Industrial | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	9,635	10,608
Covered Loans | Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	20,666	10,923
Covered Loans | Commercial Business | Owner-occupied Commercial Real Estate | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	23,071	11,538
Covered Loans | Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	20,257	12,187
Covered Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	20,607	10,611
Covered Loans | Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	3,110	1,556
Covered Loans | Real Estate Construction and Land Development | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,243	1,298
Covered Loans | Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	1,308	1,556
Covered Loans | Real Estate Construction and Land Development | One-to-four Family Residential | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	103	1,298
Covered Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	1,802	0
Covered Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,140	0
Covered Loans | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	2,717	2,000
Covered Loans | Consumer | Outstanding Principal
Financing Receivable, Impaired [Line Items]
Recorded investment of PCI loans	$2,945	$2,022

Covered_Loans_Receivable_Accre

Covered Loans Receivable (Accretable Yield) (Details) (Covered Loans, USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		1-May-14
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year	$9,535,000		$14,286,000		$19,912,000
Accretion	-3,749,000		-4,210,000		-6,679,000
Disposal and other	-1,718,000		-4,902,000		-1,140,000
Change in accretable yield	4,452,000	[1]	4,361,000	[1]	2,193,000	[1]
Balance at the end of the year	8,520,000		9,535,000		14,286,000
Washington Banking
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year							3,500,000
Balance at the end of the year							3,500,000
Contractual cash flows on loans acquired							75,100,000
Expected cash flows on loans acquired							52,200,000
Non-accretable difference							22,900,000
Estimated fair value of loans acquired							48,700,000
Washington Banking | Non-PCI Loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Contractual cash flows on loans acquired							70,300,000
Expected cash flows on loans acquired							66,500,000
Non-accretable difference							3,800,000
Estimated fair value of loans acquired							$58,400,000
[1]	Includes accretable difference at acquisition.

Allowance_for_Loan_Losses_Summ

Allowance for Loan Losses (Summary of Changes in Loan Allowance) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of changes in allowance for loan losses
Balance at the beginning of period				$28,824				$28,594	$28,824	$28,594	$30,915
Charge-offs									-6,597	-4,371	-6,074
Recoveries of loans previously charged -off									908	929	1,737
Provision for loan losses	2,851	594	691	458	428	1,078	1,308	858	4,594	3,672	2,016
Balance at the end of period	27,729				28,824				27,729	28,824	28,594
Noncovered Loans
Schedule of changes in allowance for loan losses
Balance at the beginning of period				22,657				24,242	22,657	24,242	26,952
Charge-offs									-3,643	-4,298	-6,017
Recoveries of loans previously charged -off									907	929	1,737
Provision for loan losses									2,232	1,784	1,570
Balance at the end of period	22,153				22,657				22,153	22,657	24,242
Covered Loans
Schedule of changes in allowance for loan losses
Balance at the beginning of period				6,167				4,352	6,167	4,352	3,963
Charge-offs									-2,954	-73	-57
Recoveries of loans previously charged -off									1	0	0
Provision for loan losses									2,362	1,888	446
Balance at the end of period	$5,576				$6,167				$5,576	$6,167	$4,352

Allowance_for_Loan_Losses_Acti

Allowance for Loan Losses (Activity in Allowance for Losses Disaggregated on Basis of Impairment) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				$28,824				$28,594	$28,824	$28,594	$30,915
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-6,597	-4,371	-6,074
Recoveries									908	929	1,737
Provisions for / (reallocation of) loan losses	2,851	594	691	458	428	1,078	1,308	858	4,594	3,672	2,016
Balance at the end of period	27,729				28,824				27,729	28,824	28,594
Noncovered Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				22,657				24,242	22,657	24,242	26,952
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-3,643	-4,298	-6,017
Recoveries									907	929	1,737
Provisions for / (reallocation of) loan losses									2,232	1,784	1,570
Balance at the end of period	22,153				22,657				22,153	22,657	24,242
Individually evaluated for impairment	3,235				4,039				3,235	4,039
Collectively evaluated for impairment	14,868				14,374				14,868	14,374
Covered Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				6,167				4,352	6,167	4,352	3,963
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-2,954	-73	-57
Recoveries									1	0	0
Provisions for / (reallocation of) loan losses									2,362	1,888	446
Balance at the end of period	5,576				6,167				5,576	6,167	4,352
Individually evaluated for impairment	423				660				423	660
Collectively evaluated for impairment	148				109				148	109
Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					4,244					4,244
PCI loans collectively evaluated for impairment	4,050								4,050
Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					5,398					5,398
PCI loans collectively evaluated for impairment	5,005								5,005
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				13,478				9,912	13,478	9,912	11,805
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-4,504	-2,826	-2,292
Recoveries									716	248	1,560
Provisions for / (reallocation of) loan losses									863	6,144	-1,161
Balance at the end of period	10,553				13,478				10,553	13,478	9,912
Commercial and Industrial | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	1,325				2,716				1,325	2,716
Collectively evaluated for impairment	6,449				6,727				6,449	6,727
Commercial and Industrial | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	9				629				9	629
Collectively evaluated for impairment	108				18				108	18
Commercial and Industrial | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					2,294					2,294
PCI loans collectively evaluated for impairment	2,191								2,191
Commercial and Industrial | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					1,094					1,094
PCI loans collectively evaluated for impairment	471								471
Owner-occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				4,049				4,021	4,049	4,021	2,979
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-337	-247	-1,142
Recoveries									0	560	8
Provisions for / (reallocation of) loan losses									383	-285	2,176
Balance at the end of period	4,095				4,049				4,095	4,049	4,021
Owner-occupied Commercial Real Estate | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	684				595				684	595
Collectively evaluated for impairment	1,629				2,101				1,629	2,101
Owner-occupied Commercial Real Estate | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	295				0				295	0
Collectively evaluated for impairment	14				7				14	7
Owner-occupied Commercial Real Estate | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					348					348
PCI loans collectively evaluated for impairment	330								330
Owner-occupied Commercial Real Estate | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					998					998
PCI loans collectively evaluated for impairment	1,143								1,143
Non-owner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				5,326				5,369	5,326	5,369	4,394
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-411	0	-292
Recoveries									0	0	11
Provisions for / (reallocation of) loan losses									623	-43	1,256
Balance at the end of period	5,538				5,326				5,538	5,326	5,369
Non-owner Occupied Commercial Real Estate | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	465				364				465	364
Collectively evaluated for impairment	2,541				2,516				2,541	2,516
Non-owner Occupied Commercial Real Estate | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	66				0				66	0
Collectively evaluated for impairment	6				14				6	14
Non-owner Occupied Commercial Real Estate | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					359					359
PCI loans collectively evaluated for impairment	353								353
Non-owner Occupied Commercial Real Estate | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					2,073					2,073
PCI loans collectively evaluated for impairment	2,107								2,107
One-to-four Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,100				1,221	1,100	1,221	794
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-31	-52	-391
Recoveries									7	0	0
Provisions for / (reallocation of) loan losses									124	-69	818
Balance at the end of period	1,200				1,100				1,200	1,100	1,221
One-to-four Family Residential | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	75				0				75	0
Collectively evaluated for impairment	530				570				530	570
One-to-four Family Residential | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				31				0	31
Collectively evaluated for impairment	8				13				8	13
One-to-four Family Residential | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					216					216
PCI loans collectively evaluated for impairment	207								207
One-to-four Family Residential | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					270					270
PCI loans collectively evaluated for impairment	380								380
Real Estate Construction and Land Development: One-to-four Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,720				3,131	1,720	3,131	4,823
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-345	-423	-835
Recoveries									43	0	125
Provisions for / (reallocation of) loan losses									368	-988	-982
Balance at the end of period	1,786				1,720				1,786	1,720	3,131
Real Estate Construction and Land Development: One-to-four Family Residential | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	396				211				396	211
Collectively evaluated for impairment	322				429				322	429
Real Estate Construction and Land Development: One-to-four Family Residential | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	51				0				51	0
Collectively evaluated for impairment	0				0				0	0
Real Estate Construction and Land Development: One-to-four Family Residential | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					291					291
PCI loans collectively evaluated for impairment	264								264
Real Estate Construction and Land Development: One-to-four Family Residential | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					789					789
PCI loans collectively evaluated for impairment	753								753
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				953				2,309	953	2,309	3,800
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									0	-142	-445
Recoveries									0	32	0
Provisions for / (reallocation of) loan losses									19	-1,246	-1,046
Balance at the end of period	972				953				972	953	2,309
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	234				0				234	0
Collectively evaluated for impairment	650				855				650	855
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	0				0				0	0
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					98					98
PCI loans collectively evaluated for impairment	88								88
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	0								0
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				1,597				1,761	1,597	1,761	1,410
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									-969	-681	-677
Recoveries									142	89	33
Provisions for / (reallocation of) loan losses									1,999	428	995
Balance at the end of period	2,769				1,597				2,769	1,597	1,761
Consumer | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	56				153				56	153
Collectively evaluated for impairment	1,931				575				1,931	575
Consumer | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	2				0				2	0
Collectively evaluated for impairment	12				57				12	57
Consumer | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					638					638
PCI loans collectively evaluated for impairment	617								617
Consumer | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					174					174
PCI loans collectively evaluated for impairment	151								151
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at the beginning of period				601				870	601	870	910
Schedule of allowance for loan losses on the basis of impairment method
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for / (reallocation of) loan losses									215	-269	-40
Balance at the end of period	816				601				816	601	870
Unallocated | Noncovered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	816				601				816	601
Unallocated | Covered Loans
Schedule of allowance for loan losses on the basis of impairment method
Individually evaluated for impairment	0				0				0	0
Collectively evaluated for impairment	0				0				0	0
Unallocated | Noncovered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	0								0
Unallocated | Covered PCI Loans
Schedule of allowance for loan losses on the basis of impairment method
Collectively evaluated for impairment					0					0
PCI loans collectively evaluated for impairment	$0								$0

Allowance_for_Loan_Losses_Reco

Allowance for Loan Losses (Recorded Investment Disaggregated on Basis of Impairment) (Details) (Loans Receivable, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	$2,252,014	$1,234,590
Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	26,156	29,869
Collectively evaluated for impairment	2,037,749	1,104,950
PCI loans collectively evaluated for impairment	61,909
Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	4,075	4,218
Collectively evaluated for impairment	64,763	20,660
PCI loans collectively evaluated for impairment	57,362
Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		36,017
Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		38,876
Commercial and Industrial
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	570,453	351,230
Commercial and Industrial | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	9,040	10,990
Collectively evaluated for impairment	524,263	308,771
PCI loans collectively evaluated for impairment	18,040
Commercial and Industrial | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	2,334	3,761
Collectively evaluated for impairment	9,642	2,249
PCI loans collectively evaluated for impairment	7,134
Commercial and Industrial | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		16,779
Commercial and Industrial | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		8,680
Owner-occupied Commercial Real Estate
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	594,986	305,675
Owner-occupied Commercial Real Estate | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	2,781	2,998
Collectively evaluated for impairment	516,753	273,192
PCI loans collectively evaluated for impairment	16,208
Owner-occupied Commercial Real Estate | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	1,132	0
Collectively evaluated for impairment	37,446	13,443
PCI loans collectively evaluated for impairment	20,666
Owner-occupied Commercial Real Estate | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		5,119
Owner-occupied Commercial Real Estate | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		10,923
Non-owner Occupied Commercial Real Estate
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	643,636	414,604
Non-owner Occupied Commercial Real Estate | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	7,305	7,423
Collectively evaluated for impairment	598,267	385,771
PCI loans collectively evaluated for impairment	11,185
Non-owner Occupied Commercial Real Estate | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	424	0
Collectively evaluated for impairment	6,198	2,438
PCI loans collectively evaluated for impairment	20,257
Non-owner Occupied Commercial Real Estate | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		6,785
Non-owner Occupied Commercial Real Estate | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		12,187
One-to-four Family Residential
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	69,530	47,859
One-to-four Family Residential | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	245	592
Collectively evaluated for impairment	61,060	38,722
PCI loans collectively evaluated for impairment	2,235
One-to-four Family Residential | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	0	450
Collectively evaluated for impairment	2,512	797
PCI loans collectively evaluated for impairment	3,478
One-to-four Family Residential | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		3,768
One-to-four Family Residential | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		3,530
Real Estate Construction and Land Development: One-to-four Family Residential
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	49,195	21,280
Real Estate Construction and Land Development: One-to-four Family Residential | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	4,524	4,684
Collectively evaluated for impairment	38,002	15,008
PCI loans collectively evaluated for impairment	4,223
Real Estate Construction and Land Development: One-to-four Family Residential | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	179	0
Collectively evaluated for impairment	959	0
PCI loans collectively evaluated for impairment	1,308
Real Estate Construction and Land Development: One-to-four Family Residential | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		32
Real Estate Construction and Land Development: One-to-four Family Residential | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		1,556
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	64,920	48,655
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	2,056	2,404
Collectively evaluated for impairment	56,341	44,894
PCI loans collectively evaluated for impairment	2,963
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,758	0
PCI loans collectively evaluated for impairment	1,802
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		1,357
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		0
Consumer
Schedule of loan receivables on the basis of impairment method
Total gross loans receivable	259,294	45,287
Consumer | Noncovered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	205	778
Collectively evaluated for impairment	243,063	38,592
PCI loans collectively evaluated for impairment	7,055
Consumer | Covered Loans
Schedule of loan receivables on the basis of impairment method
Individually evaluated for impairment	6	7
Collectively evaluated for impairment	6,248	1,733
PCI loans collectively evaluated for impairment	2,717
Consumer | Purchased Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		2,177
Consumer | Purchased Non Covered Loans Receivable [Member]
Schedule of loan receivables on the basis of impairment method
PCI loans collectively evaluated for impairment		$2,000

FDIC_Indemnification_Asset_Det

FDIC Indemnification Asset (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]
Balance at the beginning of the year	$4,382	$7,100	$10,350
Additions as a result of the Washington Banking Merger	7,174	0	0
Cash payments received or receivable from the FDIC	-7,897	-2,537	-2,217
Loan (recapture) impairment	-1,072	1,086	843
Net amortization	-1,471	-1,267	-1,876
Balance at the end of the year	$1,116	$4,382	$7,100

Other_Real_Estate_Owned_Detail

Other Real Estate Owned (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Changes in other real estate owned
Balance at the beginning of the year	$4,559	$5,666	$4,484	$3,355
Additions	1,566	2,974	7,406
Additions from acquisitions	7,121	2,279	0
Proceeds from dispositions	-9,914	-6,253	-5,987
Gain on sales, net	23	264	587
Valuation adjustment	0	-371	-824
OREO covered by share-loss agreements	$1,200	$182

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total premises and equipment	$88,711,000	$62,412,000
Less accumulated depreciation	23,773,000	28,064,000
Premises and equipment, net	64,938,000	34,348,000
Depreciation	3,500,000	2,300,000	2,100,000
Land
Property, Plant and Equipment [Line Items]
Total premises and equipment	22,364,000	10,876,000
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Total premises and equipment	52,067,000	33,482,000
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total premises and equipment	$14,280,000	$18,054,000

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	1-May-14	Jul. 15, 2013	Jan. 09, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$119,029,000	$29,365,000
Goodwill impairment charges	0	0	0
Washington Banking
Finite-Lived Intangible Assets [Line Items]
Goodwill additions	89,700,000
Goodwill				89,664,000
Washington Banking | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Valley Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill additions		16,400,000
Goodwill					16,353,000
Valley Bank | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Northwest Commercial Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill						($399,000)
Northwest Commercial Bank | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years
Pierce Commercial Bank | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	4 years
Cowlitz Bank | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	9 years
Western Washington Bancorp | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	8 years

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-lived Intangible Assets [Roll Forward]
Balance at the beginning of the year	$1,615	$1,086	$1,513
Additions as a result of acquisitions	11,194	1,072	0
Less: amortization expense	1,920	543	427
Balance at the end of the year	$10,889	$1,615	$1,086

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Future Amortization) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$2,072
2016	1,443
2017	1,285
2018	1,122
2019	1,043
Thereafter	3,924
Total intangible assets	$10,889

Deposits_Details

Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
Noninterest demand deposits, Amount	$709,673	$349,902
NOW accounts, Amount	793,362	352,051
Money market accounts, Amount	520,065	232,016
Savings accounts, Amount	357,834	155,790
Total non-maturity deposits, Amount	2,380,934	1,089,759
Certificate of deposit accounts, Amount	525,397	309,430
Total deposits, Amount	$2,906,331	$1,399,189
Noninterest demand deposits, Percent	24.40%	25.00%
NOW accounts, Percent	27.30%	25.20%
Money market accounts, Percent	17.90%	16.60%
Savings accounts, Percent	12.30%	11.10%
Total non-maturity deposits, Percent	81.90%	77.90%
Certificate of deposit accounts, Percent	18.10%	22.10%
Total deposits, Percent	100.00%	100.00%

Interest_expense_deposits_Deta

(Interest expense deposits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
NOW accounts	$1,011	$645	$797
Money market accounts	896	386	452
Savings accounts	252	164	204
Certificate of deposit accounts	2,991	2,478	3,016
Interest expense	$5,150	$3,673	$4,469

Deposits_Future_maturities_of_

Deposits (Future maturities of certificates of deposit) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
2015	$347,895
2016	107,849
2017	35,254
2018	13,887
2019	19,883
Thereafter	629
Certificates of deposit	$525,397	$309,430

Deposits_Details_Textual

Deposits (Details Textual) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Accrued interest payable on deposits	$390,000	$152,000
Time Deposits, $250,000 or More, Domestic	$79,800,000	$55,000,000

Junior_Subordinated_Debentures1

Junior Subordinated Debentures (Details) (USD $)	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2014	1-May-14	Dec. 31, 2013
Debt Instrument [Line Items]
Junior subordinated debentures		$19,082,000	$18,900,000	$0
Issued amount	$25,000,000
Debt term	30 years
Interest rate at end of period		1.82%
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Weighted average rate		3.59%
LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.56%

Repurchase_Agreements_Details

Repurchase Agreements (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Repurchase Agreements [Abstract]
Repurchase agreement, maturity period	1 day
Securities sold under agreement to repurchase	$32,181	$29,420
Assets sold under agreements to repurchase, interest rate	0.26%	0.27%

Other_Borrowings_Details

Other Borrowings (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Credit facility maintained	$374,300,000
FHLB borrowing transactions	0	0
FHLB advances outstanding	0	0
Advance lines to purchase federal funds	43,000,000
Federal funds purchased	0	0
Federal Reserve Bank Advances
Line of Credit Facility [Line Items]
Credit facility	53,200,000
Borrowings outstanding	$0	$0
Minimum
Line of Credit Facility [Line Items]
Unencumbered collateral percentage	100.00%
Maximum
Line of Credit Facility [Line Items]
Unencumbered collateral percentage	125.00%

Employee_Benefits_Details

Employee Benefits (Details) (USD $)	0 Months Ended	8 Months Ended	12 Months Ended
	1-May-14	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
			Plans
Employee Benefits [Line Items]
Number of retirement plans			3
Percentage of employer contribution fully vested	100.00%	100.00%
Heritage Financial Corporation 401(k) Plan and Trust
Employee Benefits [Line Items]
Required contribution percentage			1.50%
Minimum hours of service required for eligibility			1,000
Minimum age required for eligibility			18 years
Employer profit sharing contributions			475,000
KSOP Defined Contribution Plan
Employee Benefits [Line Items]
Required contribution percentage				3.00%	3.00%
Participant's eligible compensation, percentage				2.00%	2.00%
Years until employer contribution is fully vested under ratable method			6 years
Employer profit sharing contributions				600,000	631,000
Heritage Financial Corporation 401(k) Plan and Trust Salary Saving Plan
Employee Benefits [Line Items]
Minimum age required for eligibility			18 years
Minimum service days required for eligibility			30 days
Employer matching contribution, percentage of employees' gross pay			50.00%
Maximum annual contributions per employee, percentage			3.00%
Employer matching contribution amount			852,000
KSOP Salary Saving Plan
Employee Benefits [Line Items]
Employer matching contribution amount				497,000	444,000
KSOP Employee Stock Ownership Plan
Employee Benefits [Line Items]
Minimum age required for eligibility					18 years
Minimum service years required for eligibility					1 year
ESOP, compensation expense			0	0	139,000
ESOP, number of committed-to-be-released shares		0	0	0
ESOP, number of suspense shares		0	0
Deferred Compensation Plan
Employee Benefits [Line Items]
Deferred compensation plan, compensation expense			343,000	445,000	312,000
Deferred compensation plan, employer contributions			414,000	155,000	150,000
Accrued Expenses and Other Liabilities [Member] | Washington Banking
Employee Benefits [Line Items]
Split-dollar life insurance benefits obligation		1,200,000	1,200,000	$0

Commitments_and_Contingencies_2

Commitments and Contingencies (Future Minimum Rental Payments) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$3,307
2016	2,984
2017	2,741
2018	2,276
2019	1,504
Thereafter	3,723
Total estimated future minimum annual rental commitments	$16,535

Commitments_and_Contingencies_3

Commitments and Contingencies (Outstanding Commitments to Extend Credit) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	$491,132	$234,777
One-to-four Family Residential
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	0	45
Commercial Business
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	311,818	174,296
Commercial Business | Commercial and Industrial
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	288,930	169,079
Commercial Business | Owner-occupied Commercial Real Estate
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	2,648	2,812
Commercial Business | Non-owner Occupied Commercial Real Estate
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	20,240	2,405
Real Estate Construction and Land Development
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	56,681	32,956
Real Estate Construction and Land Development | One-to-four Family Residential
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	24,028	12,236
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	32,653	20,720
Consumer
Long-term Purchase Commitment [Line Items]
Unused commitments to extend credit	$122,633	$27,480

Commitments_and_Contingencies_4

Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Counsel Fees and Expenses	$450,000
Rental expense	$3,400,000	$2,300,000	$1,900,000
Minimum
Operating Leased Assets [Line Items]
Leases renewal option term	2 years
Maximum
Operating Leased Assets [Line Items]
Leases renewal option term	10 years

Stockholders_Equity_Reconcilia

Stockholders' Equity (Reconciliation of Weighted Average Shares) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income:
Net income	$7,255	$7,068	$4,148	$2,543	$710	$3,290	$2,690	$2,885	$21,014	$9,575	$13,261
Less: Dividends and undistributed earnings allocated to participating securities									-163	-118	-162
Net income allocated to common stockholders									$20,851	$9,457	$13,099
Basic:
Weighted average common shares outstanding (in shares)									25,641,229	15,667,912	15,262,452
Less: Restricted stock awards (in shares)									-210,690	-191,677	-182,303
Total basic weighted average common shares outstanding (in shares)									25,430,539	15,476,235	15,080,149
Diluted:
Basic weighted average common shares outstanding (in shares)									25,430,539	15,476,235	15,080,149
Incremental shares from stock options (in shares)									46,750	11,480	14,640
Total diluted weighted average common shares outstanding (in shares)									25,477,289	15,487,715	15,094,789

Stockholders_Equity_Dividends_

Stockholders' Equity (Dividends) (Details) (USD $)

0 Months Ended

3 Months Ended

12 Months Ended

Nov. 11, 2014

Oct. 23, 2014

Jul. 24, 2014

Mar. 27, 2014

Jan. 29, 2014

Oct. 23, 2013

Jul. 23, 2013

Apr. 24, 2013

Jan. 30, 2013

Nov. 30, 2012

Oct. 30, 2012

Jul. 25, 2012

Jun. 26, 2012

Apr. 26, 2012

Feb. 01, 2012

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Declared

11-Nov-14

23-Oct-14

24-Jul-14

27-Mar-14

29-Jan-14

23-Oct-13

23-Jul-13

24-Apr-13

30-Jan-13

30-Nov-12

30-Oct-12

25-Jul-12

26-Jun-12

26-Apr-12

1-Feb-12

Cash Dividend per Share (in usd per share)

$0.16

$0.09

$0.09

$0.08

$0.08

$0.08

$0.18

$0.08

$0.08

$0.30

$0.08

$0.08

$0.20

$0.08

$0.06

$0.25

$0.09

$0

$0.16

$0.08

$0.18

$0.08

$0.08

$0.50

$0.42

$0.80

Record Date

2-Dec-14

6-Nov-14

7-Aug-14

8-Apr-14

10-Feb-14

5-Nov-13

6-Aug-13

10-May-13

8-Feb-13

26-Nov-12

9-Nov-12

14-Aug-12

10-Jul-12

10-May-12

10-Feb-12

Paid Date

12-Dec-14

20-Nov-14

21-Aug-14

23-Apr-14

24-Feb-14

15-Nov-13

15-Aug-13

24-May-13

22-Feb-13

6-Dec-12

21-Nov-12

24-Aug-12

24-Jul-12

24-May-12

24-Feb-12

Stockholders_Equity_Repurchase

Stockholders' Equity (Repurchased Shares and Average Share Price) (Details) (USD $)	12 Months Ended			40 Months Ended	2 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014
Ninth Plan
Class of Stock [Line Items]
Repurchased shares	0	0	389,627	590,832
Stock repurchase average share price (in usd per share)	$0	$0	$13.45	$12.83
Tenth Plan
Class of Stock [Line Items]
Repurchased shares	108,075	544,000	52,900	704,975
Stock repurchase average share price (in usd per share)	$16.68	$15.88	$13.88	$15.85
Eleventh Plan
Class of Stock [Line Items]
Repurchased shares	0	0	0		0
Stock repurchase average share price (in usd per share)	$0	$0	$0		$0

Stockholders_Equity_Narrative_

Stockholders' Equity (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Jul. 15, 2013	1-May-14		Oct. 23, 2014	Aug. 30, 2012	Aug. 30, 2011
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	20,768		163,863	249,215
Number of shares repurchased	48,304		13,138	3,419
Number of shares repurchased, average price (in usd per share)	$16.53		$14.29	$14.08
Common stock issued for business combinations	$226,235	[1]	$24,195	$0
Valley Acquisition
Class of Stock [Line Items]
Number of shares issued					1,533,267
Common Stock
Class of Stock [Line Items]
Number of shares issued in conjunction with the merger	14,000,000		1,533,000
Common stock issued for business combinations					24,200	$226,200	[1]
Eleventh Plan
Class of Stock [Line Items]
Outstanding share percent								5.00%
Outstanding (in shares)								1,513,000
Tenth Plan
Class of Stock [Line Items]
Outstanding share percent									5.00%
Outstanding (in shares)									757,000
Number of shares the Company will not repurchase									52,025
Ninth Plan
Class of Stock [Line Items]
Outstanding share percent										5.00%
Outstanding (in shares)										782,000
[1]	The amount of common stock issued in connection with the merger is net of $489,000 of issuance costs.

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Balance of AOCI at the beginning of the year	($1,162)		$1,744		$1,736
Other comprehensive (loss) income before reclassification	4,726		-2,906		8
Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	-186		0		0
Other comprehensive income (loss)	4,540		-2,906		8
Balance of AOCI at the end of the year	3,378		-1,162		1,744
Changes in Fair Value of Available for Sale Securities
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Balance of AOCI at the beginning of the year	-923	[1]	2,042	[1]	2,105	[1]
Other comprehensive (loss) income before reclassification	4,676	[1]	-2,965	[1]	-63	[1]
Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	-186	[1]	0	[1]	0	[1]
Other comprehensive income (loss)	4,490	[1]	-2,965	[1]	-63	[1]
Balance of AOCI at the end of the year	3,567	[1]	-923	[1]	2,042	[1]
Accretion of Other-than-temporary Impairment on Held-to-maturity Securities
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Balance of AOCI at the beginning of the year	-239	[1]	-298	[1]
Other comprehensive (loss) income before reclassification	50	[1]	59	[1]
Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income	0	[1]	0	[1]
Other comprehensive income (loss)	50	[1]	59	[1]
Balance of AOCI at the end of the year	-189	[1]	-239	[1]
Accretion of Other-than-temporary Impairment on Held-to-maturity Securities
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Balance of AOCI at the beginning of the year					-369	[1]
Other comprehensive (loss) income before reclassification					105	[1]
Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income					0	[1]
Other comprehensive income (loss)					105	[1]
Balance of AOCI at the end of the year					-264	[1]
Other-than-temporary Impairments on Securities Held-to-maturity
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Balance of AOCI at the beginning of the year					0	[1]
Other comprehensive (loss) income before reclassification					-34	[1]
Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income					0	[1]
Other comprehensive income (loss)					-34	[1]
Balance of AOCI at the end of the year					($34)	[1]
[1]	All amounts are net of tax.B Year endedB December 31, 2012B ChangesB infairB valueB ofavailable for sale securities (1)B Accretion of other-than-temporaryimpairment on held to maturitysecurities (1)B Other-than-temporary impairments on securities held to maturity (1)B TotalB (In thousands)Balance of AOCI at the beginning of the year$2,105B $(369)B $bB $1,736Other comprehensive (loss) income before reclassification(63)B 105B (34)B 8Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net incomebB bB bB bNet current period other comprehensive (loss) income(63)B 105B (34)B 8Balance of AOCI at the end of the year$2,042B $(264)B $(34)B $1,744(1)All amounts are net of tax.

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Measurement on Recurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair value measurements of assets on a recurring basis
Investment securities available for sale	$742,846	$163,134
Recurring
Fair value measurements of assets on a recurring basis
Total	742,846	163,134
Recurring | U.S. Treasury and U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	21,427	6,039
Recurring | Municipal securities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	173,037	49,060
Recurring | U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	542,399	108,035
Recurring | Corporate obligations
Fair value measurements of assets on a recurring basis
Investment securities available for sale	4,010
Recurring | Mutual funds and other equities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	1,973
Recurring | Level 1
Fair value measurements of assets on a recurring basis
Total	1,973	0
Recurring | Level 1 | U.S. Treasury and U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 1 | Municipal securities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 1 | U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 1 | Corporate obligations
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0
Recurring | Level 1 | Mutual funds and other equities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	1,973
Recurring | Level 2
Fair value measurements of assets on a recurring basis
Total	740,873	163,134
Recurring | Level 2 | U.S. Treasury and U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	21,427	6,039
Recurring | Level 2 | Municipal securities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	173,037	49,060
Recurring | Level 2 | U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	542,399	108,035
Recurring | Level 2 | Corporate obligations
Fair value measurements of assets on a recurring basis
Investment securities available for sale	4,010
Recurring | Level 2 | Mutual funds and other equities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0
Recurring | Level 3
Fair value measurements of assets on a recurring basis
Total	0	0
Recurring | Level 3 | U.S. Treasury and U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 3 | Municipal securities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 3 | U.S. Government-sponsored agencies
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0	0
Recurring | Level 3 | Corporate obligations
Fair value measurements of assets on a recurring basis
Investment securities available for sale	0
Recurring | Level 3 | Mutual funds and other equities
Fair value measurements of assets on a recurring basis
Investment securities available for sale	$0

Fair_Value_Measurements_Fair_V1

Fair Value Measurements (Fair Value Measurement on Nonrecurring Basis) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	$36,874		$36,340
Other real estate owned, Basis	3,355		4,559		5,666	4,484
Level 1
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	0		0
Level 2
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	36,874		36,340
Level 3
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	0		0
Nonrecurring
Fair value measurements of assets on a nonrecurring basis
Total, Basis	2,340	[1]	18,382	[1]
Total	1,919		13,185
Total, Net Losses (Gains) Recorded in Earnings	423		1,229
Nonrecurring | Level 1
Fair value measurements of assets on a nonrecurring basis
Total	0		0
Nonrecurring | Level 2
Fair value measurements of assets on a nonrecurring basis
Total	11		19
Nonrecurring | Level 3
Fair value measurements of assets on a nonrecurring basis
Total	1,908		13,166
Nonrecurring | Private Residential Collateralized Mortgage Obligations
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Basis	36	[1]	19	[1]
Investment securities held to maturity, Total	11		19
Total, Net Losses (Gains) Recorded in Earnings	45		38
Nonrecurring | Private Residential Collateralized Mortgage Obligations | Level 1
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	0		0
Nonrecurring | Private Residential Collateralized Mortgage Obligations | Level 2
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	11		19
Nonrecurring | Private Residential Collateralized Mortgage Obligations | Level 3
Fair value measurements of assets on a nonrecurring basis
Investment securities held to maturity, Total	0		0
Nonrecurring | Commercial Properties
Fair value measurements of assets on a nonrecurring basis
Other real estate owned, Basis			1,720	[1]
Other real estate owned, Total			1,222
Total, Net Losses (Gains) Recorded in Earnings			348
Nonrecurring | Commercial Properties | Level 1
Fair value measurements of assets on a nonrecurring basis
Other real estate owned, Total			0
Nonrecurring | Commercial Properties | Level 2
Fair value measurements of assets on a nonrecurring basis
Other real estate owned, Total			0
Nonrecurring | Commercial Properties | Level 3
Fair value measurements of assets on a nonrecurring basis
Other real estate owned, Total			1,222
Nonrecurring | Noncovered Impaired Loans
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	2,304	[1]	12,442	[1]
Impaired originated loans, Total			8,403
Total, Net Losses (Gains) Recorded in Earnings	378		230
Nonrecurring | Noncovered Impaired Loans | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	1,908		8,403
Nonrecurring | Noncovered Impaired Loans | One-to-four Family Residential
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			0	[1]
Impaired originated loans, Total			0
Total, Net Losses (Gains) Recorded in Earnings			0
Nonrecurring | Noncovered Impaired Loans | One-to-four Family Residential | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | One-to-four Family Residential | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | One-to-four Family Residential | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | Commercial Business
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	161	[1]	10,853	[1]
Impaired originated loans, Total	138		7,178
Total, Net Losses (Gains) Recorded in Earnings	23		-134
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	138		7,178
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Commercial and Industrial
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	161	[1]	4,850	[1]
Impaired originated loans, Total	138		2,134
Total, Net Losses (Gains) Recorded in Earnings	23		1,681
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Commercial and Industrial | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Commercial and Industrial | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Commercial and Industrial | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	138		2,134
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Owner-occupied Commercial Real Estate
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			1,880	[1]
Impaired originated loans, Total			1,285
Total, Net Losses (Gains) Recorded in Earnings			594
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Owner-occupied Commercial Real Estate | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Owner-occupied Commercial Real Estate | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Owner-occupied Commercial Real Estate | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			1,285
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			4,123	[1]
Impaired originated loans, Total			3,759
Total, Net Losses (Gains) Recorded in Earnings			-2,409
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Noncovered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			3,759
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	2,094	[1]	911	[1]
Impaired originated loans, Total	1,725		700
Total, Net Losses (Gains) Recorded in Earnings	350		211
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	1,725		700
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | One-to-four Family Residential
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	2,094	[1]	911	[1]
Impaired originated loans, Total	1,725		700
Total, Net Losses (Gains) Recorded in Earnings	350		211
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | One-to-four Family Residential | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | One-to-four Family Residential | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Real Estate Construction and Land Development | One-to-four Family Residential | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	1,725		700
Nonrecurring | Noncovered Impaired Loans | Consumer
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis	49	[1]	678	[1]
Impaired originated loans, Total	45		525
Total, Net Losses (Gains) Recorded in Earnings	5		153
Nonrecurring | Noncovered Impaired Loans | Consumer | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Consumer | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	0		0
Nonrecurring | Noncovered Impaired Loans | Consumer | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total	45		525
Nonrecurring | Covered Impaired Loans
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			4,201	[1]
Impaired originated loans, Total			3,541
Total, Net Losses (Gains) Recorded in Earnings			613
Nonrecurring | Covered Impaired Loans | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			3,541
Nonrecurring | Covered Impaired Loans | One-to-four Family Residential
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			450	[1]
Impaired originated loans, Total			419
Total, Net Losses (Gains) Recorded in Earnings			-13
Nonrecurring | Covered Impaired Loans | One-to-four Family Residential | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | One-to-four Family Residential | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | One-to-four Family Residential | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			419
Nonrecurring | Covered Impaired Loans | Commercial Business
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			3,751	[1]
Impaired originated loans, Total			3,122
Total, Net Losses (Gains) Recorded in Earnings			628
Nonrecurring | Covered Impaired Loans | Commercial Business | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			3,122
Nonrecurring | Covered Impaired Loans | Commercial Business | Commercial and Industrial
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			3,751	[1]
Impaired originated loans, Total			3,122
Total, Net Losses (Gains) Recorded in Earnings			628
Nonrecurring | Covered Impaired Loans | Commercial Business | Commercial and Industrial | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Commercial and Industrial | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Commercial and Industrial | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			3,122
Nonrecurring | Covered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			0	[1]
Impaired originated loans, Total			0
Total, Net Losses (Gains) Recorded in Earnings			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Commercial Business | Non-owner Occupied Commercial Real Estate | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Consumer
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Basis			0	[1]
Impaired originated loans, Total			0
Total, Net Losses (Gains) Recorded in Earnings			-2
Nonrecurring | Covered Impaired Loans | Consumer | Level 1
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Consumer | Level 2
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			0
Nonrecurring | Covered Impaired Loans | Consumer | Level 3
Fair value measurements of assets on a nonrecurring basis
Impaired originated loans, Total			$0
[1]	asis represents the unpaid principal balance of noncovered impaired and covered impaired loans, amortized cost of investment securities held to maturity, and carrying value at ownership date of other real estate owned.

Fair_Value_Measurements_Quanti

Fair Value Measurements (Quantitative Information, Level 3) (Details) (Nonrecurring, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Noncovered Impaired Loans
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Impaired loans		$8,403
Covered Impaired Loans
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Impaired loans		3,541
Level 3 | Noncovered Impaired Loans
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Impaired loans	1,908	8,403
Valuation Technique(s)	MarketB approach	MarketB approach
Unobservable Input(s)	Adjustment for differences between the comparable sales	Adjustment for differences between the comparable sales
Level 3 | Noncovered Impaired Loans | Minimum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average	-47.50%	-27.80%
Level 3 | Noncovered Impaired Loans | Maximum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average	96.20%	19.10%
Level 3 | Noncovered Impaired Loans | Weighted Average
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average	7.00%	-6.60%
Level 3 | Covered Impaired Loans
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Impaired loans		3,541
Valuation Technique(s)		Market approach
Unobservable Input(s)		Adjustment for differences between the comparable sales
Level 3 | Covered Impaired Loans | Minimum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		-50.00%
Level 3 | Covered Impaired Loans | Maximum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		-25.00%
Level 3 | Covered Impaired Loans | Weighted Average
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		-35.00%
Level 3 | Other Real Estate Owned
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Other real estate owned		$1,222
Valuation Technique(s)		Market approach
Unobservable Input(s)		Adjustment for differences between the comparable sales
Level 3 | Other Real Estate Owned | Minimum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		-60.10%
Level 3 | Other Real Estate Owned | Maximum
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		13.60%
Level 3 | Other Real Estate Owned | Weighted Average
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range of Inputs; Weighted Average		-35.20%

Fair_Value_Measurements_Carryi

Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Assets:
Investment securities held to maturity	$36,874	$36,340
Financial Liabilities:
Certificate of deposit accounts	525,397
Level 1
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	0	0
Investment securities available for sale	1,973	0
Investment securities held to maturity	0	0
Loans held for sale	0
Loans receivable, net of allowance for loan losses	0	0
Accrued interest receivable	3	26
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	0	0
Total deposits	2,380,934	1,089,759
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	0
Accrued interest payable	62	17
Level 2
Financial Assets:
Cash and cash equivalents	0	0
Other interest earning deposits	10,145	15,747
Investment securities available for sale	740,873	163,134
Investment securities held to maturity	36,874	36,340
Loans held for sale	5,710
Loans receivable, net of allowance for loan losses	0	0
Accrued interest receivable	3,009	910
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	0	0
Certificate of deposit accounts	525,768	311,065
Total deposits	525,768	311,065
Securities sold under agreement to repurchase	0	0
Junior subordinated debentures	0
Accrued interest payable	328	135
Level 3
Financial Assets:
Cash and cash equivalents	0	0
Other interest earning deposits	0	0
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale	0
Loans receivable, net of allowance for loan losses	2,279,081	1,218,192
Accrued interest receivable	6,824	4,526
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	0	0
Certificate of deposit accounts	0	0
Total deposits	0	0
Securities sold under agreement to repurchase	0	0
Junior subordinated debentures	19,082
Accrued interest payable	21	0
Carrying Value
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	10,126	15,662
Investment securities available for sale	742,846	163,134
Investment securities held to maturity	35,814	36,154
Federal Home Loan Bank stock	12,188	5,741
Loans held for sale	5,582
Loans receivable, net of allowance for loan losses	2,223,348	1,203,096
Accrued interest receivable	9,836	5,462
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	525,397	309,430
Total deposits	2,906,331	1,399,189
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	19,082
Accrued interest payable	411	152
Fair Value
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	10,145	15,747
Investment securities available for sale	742,846	163,134
Investment securities held to maturity	36,874	36,340
Loans held for sale	5,710
Loans receivable, net of allowance for loan losses	2,279,081	1,218,192
Accrued interest receivable	9,836	5,462
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	525,768	311,065
Total deposits	2,906,702	1,400,824
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	19,082
Accrued interest payable	$411	$152

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Fair value assets transfers between level 1 and level 2 transfer amount	$0	$0	$0

StockBased_Compensation_Narrat

Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 24, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards granted (in shares)	0	0	0
Shares remain available for future issuances under stock-based compensation plans	1,384,105
Proceeds from exercise of stock options	$921,000	$176,000	$129,000
Restricted stock awards issued, net of forfeitures	1,400,000	1,200,000	842,000
the Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance				1,500,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation	20,000	71,000	106,000
Tax benefit	0	0	1,000
Intrinsic value of options exercised	459,000	54,000	31,000
Proceeds from exercise of stock options	915,000	200,000	129,000
Employee Stock Option | Option 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested ratably	3 years
Expired ratably	5 years
Employee Stock Option | Option 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested ratably	4 years
Expired ratably	10 years
Restricted Stock Awards | Award 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested ratably	5 years
Restricted Stock Awards | Award 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested ratably	4 years
Restricted and Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation	1,400,000	1,200,000	1,200,000
Tax benefit	489,000	428,000	415,000
Unrecognized compensation expense related to non-vested stock option	$2,500,000
Weighted average period	2 years 3 months 25 days

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Option Activity (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Shares
Outstanding at beginning of period (in shares)	194,482		300,658	417,123
Granted (in shares)	90,248	[1]	0	0
Exercised (in shares)	-84,189		-16,553	-11,365
Forfeited or expired (in shares)	-44,134		-89,623	-105,100
Outstanding at end of period (in shares)	156,407		194,482	300,658
Vested and expected to vest at end of period (in shares)	156,407
Exercisable at end of period (in shares)	156,407
Weighted-Average Exercise Price
Outstanding at beginning of period (in usd per share)	$15.82		$17.48	$18.33
Granted (in usd per share)	$10.72		$0	$0
Exercised (in usd per share)	$10.86		$12.10	$11.35
Forfeited or expired (in usd per share)	$22.76		$22.07	$21.52
Outstanding at end of period (in usd per share)	$13.59		$15.82	$17.48
Vested and expected to vest at end of period (in usd per share)	$13.59
Exercisable at end of period (in usd per share)	$13.59
Weighted-Average Remaining Contractual Term, Outstanding	2 years 7 months 17 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest	2 years 7 months 17 days
Weighted-Average Remaining Contractual Term, Exercisable	2 years 7 months 17 days
Aggregate Intrinsic Value, Outstanding	$647
Aggregate Intrinsic Value, Vested and expected to vest	647
Aggregate Intrinsic Value, Exercisable	$647
[1]	Options granted during the year ended December 31, 2014 represent the stock options issued in conjunction with the Washington Banking Merger. See "Note 2. Business Combinations" for additional information. The weighted average exercise price reflects the exchange ratio applied to the original Washington Banking exercise price pursuant to the Merger Agreement.

StockBased_Compensation_Restri

Stock-Based Compensation - Restricted and Unrestricted Stock Award Activity (Details) (Restricted and Unrestricted Stock, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted and Unrestricted Stock
Shares
Nonvested at beginning of period (in shares)	202,939	189,670	164,880
Granted (in shares)	130,548	103,195	91,738
Vested (in shares)	-85,373	-86,819	-61,445
Forfeited (in shares)	-9,445	-3,107	-5,503
Nonvested at end of period (in shares)	238,669	202,939	189,670
Weighted-Average Grant Date Fair Value
Nonvested at beginning of period (in usd per share)	$14.29	$14.86	$16.29
Granted (in usd per share)	$16.03	$14.31	$14.02
Vested (in usd per share)	$14.37	$15.55	$17.41
Forfeited (in usd per share)	$14.67	$14.89	$15.21
Nonvested at end of period (in usd per share)	$15.20	$14.29	$14.86

Income_Taxes_Income_Tax_Expens

Income Taxes (Income Tax Expense) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current tax expense									$9,992	$4,344	$5,916
Current tax expense									-3,087	326	185
(Decrease) increase in valuation allowance									0	77	-77
Income tax expense	$1,328	$2,765	$1,544	$1,268	$433	$1,510	$1,292	$1,358	$6,905	$4,593	$6,178

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Effective Income Tax Rate) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense at Federal statutory rate									$9,772,000	$4,959,000	$6,804,000
Tax-exempt instruments									-1,598,000	-858,000	-649,000
Non-deductible acquisition costs									373,000	469,000	0
Federal tax credits									-812,000	0	0
Effects of BOLI									-159,000	-25,000	-28,000
Tax position resolution									-728,000	0	0
Valuation allowance									0	-77,000	77,000
Other, net									57,000	125,000	-26,000
Income tax expense	1,328,000	2,765,000	1,544,000	1,268,000	433,000	1,510,000	1,292,000	1,358,000	6,905,000	4,593,000	6,178,000
Subsidiary | New Market Tax Credit Investments
Tax Credit Carryforward [Line Items]
Number of tranches	3								3
Tax credit	25,000,000								25,000,000
Tax credit, required funding percentage									85.00%
Subsidiary | New Market Tax Credit Investments | 2020
Tax Credit Carryforward [Line Items]
Tax credits subject to expiration	$9,800,000								$9,800,000
Gross tax credits, Expiration Year									2020

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Allowance for loan losses	$5,460	$7,003
Capital loss carryforward	1,382	821
Stock compensation	818	524
Capital loss carryforward	30	95
Unrealized losses charged to earnings on other than temporarily impaired investment securities	338	622
Net unrealized losses charged to other comprehensive income on securities	0	626
Goodwill and other intangible assets	0	2,107
Market discount on purchased loans	17,949	6,767
Net operating loss carryforward acquired from NCB	2,337	1,026
Net operating loss carryforward acquired from NCB	553	588
Difference in amounts reflected in financial statements and income tax basis of certain liabilities assumed in business combinations	3,492	0
Other deferred tax assets	1,394	705
Deferred Tax Assets, Gross	33,753	20,884
Deferred tax liabilities:
Deferred loan fees, net	-1,982	-867
Premises and equipment	-1,937	-1,520
FHLB stock	-2,768	-1,039
Net unrealized gains charged to other comprehensive income on securities	-1,832	0
Indemnification asset	-392	-1,539
Indemnification asset	-1,560	0
Federal tax credits	-439	0
Junior subordinated debentures	-2,349	0
Other deferred tax liabilities	-730	-248
Total deferred tax liabilities	13,989	5,213
Deferred income tax asset, net	$19,764	$15,671

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$1,600,000	$1,700,000
Operating loss carryforward, expiration year	2033
Federal capital loss carryforwards, expiration year	2018
Valuation allowance	0	0
Taxable temporary difference, bad debt reserve	2,800,000
Deferred tax liability not recognized for the temporary difference	980,000
Capital Loss Carryforward | Federal
Operating Loss Carryforwards [Line Items]
Federal capital loss carryforwards	$85,000	$270,000

Regulatory_Capital_Requirement2

Regulatory Capital Requirements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital to average assets, Minimum Requirements	$132,881	$65,847
Tier 1 capital to risk-weighted assets, Minimum Requirements	97,620	47,853
Total capital to risk-weighted assets, Minimum Requirements	195,240	95,706
Tier 1 leverage capital to average assets, Minimum Requirements, Percentage	4.00%	4.00%
Tier 1 capital to risk-weighted assets, Minimum Requirements, Percentage	4.00%	4.00%
Total capital to risk-weighted assets, Minimum Requirements, Percentage	8.00%	8.00%
Tier 1 leverage capital to average assets, Actual	340,292	185,951
Tier 1 capital to risk-weighted assets, Actual	340,292	185,951
Total capital to risk-weighted assets, Actual	368,198	201,076
Tier 1 leverage capital to average assets, Actual, Percentage	10.20%	11.30%
Tier 1 capital to risk-weighted assets, Actual, Percentage	13.90%	15.50%
Total capital to risk-weighted assets, Actual, Percentage	15.10%	16.80%
Heritage Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital to average assets, Minimum Requirements	132,853	65,831
Tier 1 capital to risk-weighted assets, Minimum Requirements	97,585	47,807
Total capital to risk-weighted assets, Minimum Requirements	195,171	95,613
Tier 1 leverage capital to average assets, Minimum Requirements, Percentage	4.00%	4.00%
Tier 1 capital to risk-weighted assets, Minimum Requirements, Percentage	4.00%	4.00%
Total capital to risk-weighted assets, Minimum Requirements, Percentage	8.00%	8.00%
Tier 1 leverage capital to average assets, Well-Capitalized Requirements	166,066	82,288
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements	146,378	71,710
Total capital to risk-weighted assets, Well-Capitalized Requirements	243,964	119,517
Tier 1 leverage capital to average assets, Well-Capitalized Requirements, Percentage	5.00%	5.00%
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements, Percentage	6.00%	6.00%
Total capital to risk-weighted assets, Well-Capitalized Requirements, Percentage	10.00%	10.00%
Tier 1 leverage capital to average assets, Actual	332,147	182,543
Tier 1 capital to risk-weighted assets, Actual	332,147	182,543
Total capital to risk-weighted assets, Actual	$360,053	$197,656
Tier 1 leverage capital to average assets, Actual, Percentage	10.00%	11.10%
Tier 1 capital to risk-weighted assets, Actual, Percentage	13.60%	15.30%
Total capital to risk-weighted assets, Actual, Percentage	14.80%	16.50%

Heritage_Financial_Corporation2

Heritage Financial Corporation (Parent Only) (Condensed Statement of Financial Condition) (Details) (USD $)	Dec. 31, 2014	1-May-14	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and interest earning deposits	$121,636		$130,400	$104,268	$123,173
Total assets	3,457,750		1,659,038
Junior subordinated debentures	19,082	18,900	0
Other liabilities	45,650		14,667
Total stockholdersb equity	454,506		215,762	198,938	202,520
Total liabilities and stockholdersb equity	3,457,750		1,659,038
Parent Company
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and interest earning deposits	8,835		2,645	16,251	20,542
Investment in subsidiary bank	465,442		212,354
Other assets	863		1,041
Total assets	475,140		216,040
Junior subordinated debentures	19,082		0
Other liabilities	1,552		278
Total stockholdersb equity	454,506		215,762
Total liabilities and stockholdersb equity	$475,140		$216,040

Heritage_Financial_Corporation3

Heritage Financial Corporation (Parent Only) (Condensed Income Statement) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
ESOP loan									$110,437	$67,630	$65,588
Total interest income	38,439	35,031	30,023	17,613	18,552	18,533	16,859	17,484	121,106	71,428	69,109
Junior subordinated debentures									458	0	0
Total interest expense	1,659	1,724	1,426	872	907	952	919	946	5,681	3,724	4,534
Net interest income	36,780	33,307	28,597	16,741	17,645	17,581	15,940	16,538	115,425	67,704	64,575
Other income									4,986	2,493	1,809
Total noninterest income	3,897	5,483	4,780	2,307	2,430	2,582	2,357	2,282	16,467	9,651	7,272
Professional services									6,185	3,936	2,543
Other expense									9,112	4,798	4,343
Total noninterest expense	29,243	28,363	26,994	14,779	18,504	14,285	13,007	13,719	99,379	59,515	50,392
Income before income taxes	8,583	9,833	5,692	3,811	1,143	4,800	3,982	4,243	27,919	14,168	19,439
Income tax benefit	1,328	2,765	1,544	1,268	433	1,510	1,292	1,358	6,905	4,593	6,178
Net income	7,255	7,068	4,148	2,543	710	3,290	2,690	2,885	21,014	9,575	13,261
Parent Company
Condensed Income Statements, Captions [Line Items]
Interest earning deposits and other assets									17	22	44
ESOP loan									0	0	8
Total interest income									17	22	52
Junior subordinated debentures									458	0	0
Total interest expense									458	0	0
Net interest income									-441	22	52
Dividends from subsidiary banks									66,300	26,000	14,100
Equity in (excess distributed) undistributed income of subsidiary banks									-40,737	-13,001	962
Other income									3	0	0
Total noninterest income									25,566	12,999	15,062
Professional services									2,943	1,718	0
Other expense									3,109	2,905	2,766
Total noninterest expense									6,052	4,623	2,766
Income before income taxes									19,073	8,398	12,348
Income tax benefit									-1,941	-1,177	-913
Net income									$21,014	$9,575	$13,261

Heritage_Financial_Corporation4

Heritage Financial Corporation (Parent Only) (Condensed Cash Flow Statement) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net income	$21,014	$9,575	$13,261
Tax (benefit) provision realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	-112	13	93
Recognition of compensation related to ESOP shares and share based payment	1,395	1,223	1,185
Stock option compensation expense	20	71	106
Net cash provided by operating activities	51,336	30,897	27,882
Net cash used in investing activities	-121,649	-16,593	-3,502
Common stock cash dividends paid	-12,892	-6,672	-12,155
Proceeds from exercise of stock options	921	176	129
Tax benefit (provision) realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	112	-13	-93
Repurchase of common stock	-2,601	-8,825	-6,023
Net cash provided by (used in) financing activities	61,549	11,828	-43,285
Net (decrease) increase in cash and cash equivalents	-8,764	26,132	-18,905
Cash and cash equivalents at beginning of year	130,400	104,268	123,173
Cash and cash equivalents at end of year	121,636	130,400	104,268
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net income	21,014	9,575	13,261
Equity in excess distributed (undistributed) income of subsidiary bank	40,737	13,001	-962
Tax (benefit) provision realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	-112	13	93
Recognition of compensation related to ESOP shares and share based payment	1,395	1,223	1,185
Stock option compensation expense	20	71	106
Net change in other assets and liabilities	811	-489	7
Net cash provided by operating activities	63,865	23,394	13,690
ESOP loan principal repayments	0	0	161
Investment in subsidiary	-43,215	-21,666	0
Net cash used in investing activities	-43,215	-21,666	161
Common stock cash dividends paid	-12,892	-6,672	-12,155
Proceeds from exercise of stock options	921	176	129
Tax benefit (provision) realized from stock options exercised, share-based payment and dividends on unallocated ESOP shares	112	-13	-93
Repurchase of common stock	-2,601	-8,825	-6,023
Net cash provided by (used in) financing activities	-14,460	-15,334	-18,142
Net (decrease) increase in cash and cash equivalents	6,190	-13,606	-4,291
Cash and cash equivalents at beginning of year	2,645	16,251	20,542
Cash and cash equivalents at end of year	$8,835	$2,645	$16,251

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	0 Months Ended															3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Nov. 11, 2014	Oct. 23, 2014	Jul. 24, 2014	Mar. 27, 2014	Jan. 29, 2014	Oct. 23, 2013	Jul. 23, 2013	Apr. 24, 2013	Jan. 30, 2013	Nov. 30, 2012	Oct. 30, 2012	Jul. 25, 2012	Jun. 26, 2012	Apr. 26, 2012	Feb. 01, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest income																$38,439	$35,031	$30,023	$17,613	$18,552	$18,533	$16,859	$17,484	$121,106	$71,428	$69,109
Interest expense																1,659	1,724	1,426	872	907	952	919	946	5,681	3,724	4,534
Net interest income																36,780	33,307	28,597	16,741	17,645	17,581	15,940	16,538	115,425	67,704	64,575
Provision for loan losses																2,851	594	691	458	428	1,078	1,308	858	4,594	3,672	2,016
Net interest income after provision for loan losses																33,929	32,713	27,906	16,283	17,217	16,503	14,632	15,680	110,831	64,032	62,559
Noninterest income																3,897	5,483	4,780	2,307	2,430	2,582	2,357	2,282	16,467	9,651	7,272
Noninterest expense																29,243	28,363	26,994	14,779	18,504	14,285	13,007	13,719	99,379	59,515	50,392
Income before income taxes																8,583	9,833	5,692	3,811	1,143	4,800	3,982	4,243	27,919	14,168	19,439
Income tax expense																1,328	2,765	1,544	1,268	433	1,510	1,292	1,358	6,905	4,593	6,178
Net income																$7,255	$7,068	$4,148	$2,543	$710	$3,290	$2,690	$2,885	$21,014	$9,575	$13,261
Basic earnings per common share (in usd per share)																$0.24	$0.23	$0.16	$0.16	$0.04	$0.20	$0.18	$0.19	$0.82	$0.61	$0.87
Diluted earnings per common share (in usd per share)																$0.24	$0.23	$0.16	$0.16	$0.04	$0.20	$0.18	$0.19	$0.82	$0.61	$0.87
Cash dividends declared on common stock (in usd per share)	$0.16	$0.09	$0.09	$0.08	$0.08	$0.08	$0.18	$0.08	$0.08	$0.30	$0.08	$0.08	$0.20	$0.08	$0.06	$0.25	$0.09	$0	$0.16	$0.08	$0.18	$0.08	$0.08	$0.50	$0.42	$0.80

Subsequent_Event_Details

Subsequent Event (Details) (Subsequent Event, USD $)	Mar. 05, 2015
Subsequent Event
Subsequent Event [Line Items]
Total consideration for sale of merchant card portfolio	$2,200,000
Consideration received at the time of sale	1,650,000
Consideration held in escrow	550,000
Contingent consideration, minimum payment, if performance thresholds are met	440,000
Contingent consideration, maximum payment, if performance thresholds are met	550,000
Contingent payment if thresholds are not met	$0