Independent Bank (INDB) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 01, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	Independent Bank Corp
Entity Central Index Key	776901
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	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$871,400,514
Entity Common Stock, Shares Outstanding		24,019,698

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$143,342		$168,106
Interest-earning deposits with banks	34,912		48,219
Securities
Securities available for sale	348,554		356,862
Securities held to maturity (fair value $379,699 and $346,455)	375,453		350,652
Total securities	724,007		707,514
Loans held for sale (at fair value)	6,888		8,882
Loans
Commercial and industrial	860,839		784,202
Commercial real estate	2,347,323		2,249,260
Commercial construction	265,994		223,859
Small business	85,247		77,240
Residential real estate	530,259		541,443
Loans and Leases Receivable Consumer Home Equity in First Position	513,518		497,075
Loans and Leases Receivable Consumer Home Equity in Subordinate Position	350,345		325,066
Other consumer	17,208		20,162
Total loans	4,970,733	[1]	4,718,307	[1]
Less: allowance for loan losses	-55,100		-53,239
Net loans	4,915,633		4,665,068
Federal Home Loan Bank stock	33,233		39,926
Bank premises and equipment, net	64,074		64,950
Goodwill	170,421		170,421
Identifiable intangible assets	9,885		12,221
Cash surrender value of life insurance policies	109,854		100,406
Other real estate owned and other foreclosed assets	7,743		7,633
Other assets	144,920		105,888
Total assets	6,364,912		6,099,234
Deposits
Demand deposits	1,462,200		1,369,432
Savings and interest checking accounts	2,108,486		1,940,153
Money market	990,160		933,205
Time certificates of deposit of $100,000 and over	254,718		297,984
Other time certificates of deposits	394,902		445,644
Total deposits	5,210,466		4,986,418
Borrowings
Advances from Federal Home Loan Banks	70,080		140,294
Customer Repurchase Agreements and other short-term borrowings	147,890		154,288
Wholesale repurchase agreements	50,000		50,000
Junior subordinated debentures	73,685		73,906
Subordinated debentures	65,000		30,000
Total borrowings	406,655		448,488
Other liabilities	107,264		72,788
Total liabilities	5,724,385		5,507,694
Commitments and contingencies
Stockholders' Equity
Preferred stock, $.01 par value. authorized: 1,000,000 shares, outstanding: none	0		0
Common stock, $.01 par value. authorized: 75,000,000 issued and outstanding : 23,998,738 shares in 2014 and 23,805,984 shares in 2013 (includes 254,500 and 268,290 shares of unvested participating restricted stock awards, respectively)	237		235
Shares held in rabbi trust at cost: 176,849 shares in 2014 and 178,765 shares in 2013	-3,666		-3,404
Deferred compensation obligation	3,666		3,404
Additional paid in capital	311,978		305,179
Retained earnings	330,444		293,560
Accumulated other comprehensive loss, net of tax	-2,132		-7,434
Total stockholders' equity	640,527		591,540
Total liabilities and stockholders' equity	$6,364,912		$6,099,234
[1]	The amount of net deferred fees included in the ending balance was $2.8 million, $2.3 million, and $3.1 million at December 31, 2014, 2013, and 2012, respectively.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Time certificates of deposit least amount	$100,000	$100,000
Securities held to maturity, fair value	$379,699,000	$346,455,000
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	23,998,738	23,805,984
Common stock, shares outstanding	23,998,738	23,805,984
Common stock, unvested restricted Stock awards	254,500	268,290
Shares held in rabbit trust at cost	176,849	178,765

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Interest and fees on loans	$197,021	$189,748	$178,309
Taxable interest and dividends on securities	18,610	15,137	16,681
Nontaxable interest and dividends on securities	144	55	82
Interest on loans held for sale	405	774	988
Interest on federal funds sold and short-term investments	279	200	132
Total interest and dividend income	216,459	205,914	196,192
Interest expense
Interest on deposits	11,039	10,624	10,703
Interest on borrowings	9,378	12,712	12,690
Total interest expense	20,417	23,336	23,393
Net interest income	196,042	182,578	172,799
Provision	10,403	10,200	18,056
Net interest income after provision for loan losses	185,639	172,378	154,743
Noninterest income
Deposit account fees	18,065	17,940	15,930
Interchange and ATM fees	12,975	10,883	9,783
Investment management	19,642	16,832	14,779
Mortgage banking income	3,384	6,734	6,500
Increase in cash surrender value of life insurance policies	3,128	3,229	3,114
Gain on life insurance benefits	1,964	227	1,307
Gains (Losses) on Extinguishment of Debt	0	763	0
Loan level derivative income	2,477	3,439	3,457
Available-for-sale Securities, Gross Realized Gains	121	258	5
Gain (Loss) on Sale of Equity Investments	91	-28	111
Other noninterest income	8,096	7,732	7,030
Total noninterest income	69,943	68,009	62,016
Noninterest expenses
Salaries and employee benefits	94,044	89,894	84,014
Occupancy and equipment expenses	21,820	19,650	17,307
Data processing & facilities management	4,765	4,748	4,644
FDIC assessment	3,770	3,579	3,232
Advertising expense	3,859	4,280	3,949
Consulting expense	2,923	3,322	2,801
Debit Card	2,362	2,994	2,510
Goodwill impairment			2,227	[1]
Available-for-sale Securities, Gross Realized Losses	21	0	0
Merger and acquisition expense	1,339	8,685	6,741
Prepayment fee on borrowings			7
Other noninterest expenses	36,935	36,497	32,027
Total noninterest expenses	171,838	173,649	159,459
Income before income taxes	83,744	66,738	57,300
Provision for income taxes	23,899	16,484	14,673
Net Income	$59,845	$50,254	$42,627
Basic earnings per share (in dollars per share)	$2.50	$2.18	$1.96
Diluted earnings per share (in dollars per share)	$2.49	$2.18	$1.95
Weighted average common shares (basic) (in shares)	23,899,562	23,011,814	21,782,499
Common share equivalents (in shares)	93,815	76,764	29,817
Weighted average common shares (diluted) (in shares)	23,993,377	23,088,578	21,812,316
Cash dividends declared (in dollars per share)	$0.96	$0.88	$0.84
[1]	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.

Consolidated_Statements_of_Com

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	$59,845	$50,254	$42,627
Other comprehensive income (loss), net of tax
Net change in fair value of securities available for sale	5,412	-7,501	-1,096
Net change in fair value of cash flow hedges	2,256	3,735	1,082
Net change in other comprehensive income for defined benefit postretirement plans	-2,366	858	-26
Total other comprehensive income (loss)	5,302	-2,908	-40
Total comprehensive income	$65,147	$47,346	$42,587

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation Obligation	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
In Thousands, except Share data	USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)
Beginning balance at Dec. 31, 2011	$469,057		$213	($2,980)	$2,980	$233,878	$239,452	($4,486)
Beginning balance (in shares) at Dec. 31, 2011		21,499,768
Net income	42,627						42,627
Other comprehensive loss	-40							-40
Common dividend declared	-18,408						-18,408
Common stock issued for acquisition	30,389		11			30,378
Common stock issued for acquisition (in shares)		1,068,514
Proceeds from exercise of stock options, net of cash paid	1,108		1			1,107
Proceeds from exercise of stock options (in shares)		61,326
Tax benefit related to equity award activity	426					426
Stock based compensation	2,845					2,845
Restricted stock awards issued, net of awards surrendered (in shares)		86,254
Restricted stock awards issued, net of awards surrendered	-467					-467
Stock Issued During Period, Shares, Other		58,147
Stock Issued During Period, Value, Other	1,691					1,691
Increase (Decrease) in Deferred Compensation				-199	199
Tax benefit related to deferred compensation distributions	92					92
Ending balance at Dec. 31, 2012	529,320		225	-3,179	3,179	269,950	263,671	-4,526
Ending balance (in shares) at Dec. 31, 2012		22,774,009
Net income	50,254						50,254
Other comprehensive loss	-2,908							-2,908
Common dividend declared	-20,365						-20,365
Common stock issued for acquisition	29,390		8			29,382
Common stock issued for acquisition (in shares)		818,650
Proceeds from exercise of stock options, net of cash paid	2,475		1			2,474
Proceeds from exercise of stock options (in shares)		98,807
Tax benefit related to equity award activity	503					503
Stock based compensation	2,462					2,462
Restricted stock awards issued, net of awards surrendered (in shares)		86,331
Restricted stock awards issued, net of awards surrendered	-669		1			-670
Stock Issued During Period, Shares, Other		28,187
Stock Issued During Period, Value, Other	969					969
Increase (Decrease) in Deferred Compensation				-225	225
Tax benefit related to deferred compensation distributions	109					109
Ending balance at Dec. 31, 2013	591,540		235	-3,404	3,404	305,179	293,560	-7,434
Ending balance (in shares) at Dec. 31, 2013	23,805,984	23,805,984
Net income	59,845						59,845
Other comprehensive loss	5,302							5,302
Common dividend declared	-22,961						-22,961
Common stock issued for acquisition	0
Proceeds from exercise of stock options, net of cash paid	2,333		1			2,332
Proceeds from exercise of stock options (in shares)		91,171
Tax benefit related to equity award activity	704					704
Stock based compensation	2,712					2,712
Restricted stock awards issued, net of awards surrendered (in shares)		59,675
Restricted stock awards issued, net of awards surrendered	-641		1			-642
Stock Issued During Period, Shares, Other		41,908
Stock Issued During Period, Value, Other	1,555					1,555
Increase (Decrease) in Deferred Compensation				-262	262
Tax benefit related to deferred compensation distributions	138					138
Ending balance at Dec. 31, 2014	$640,527		$237	($3,666)	$3,666	$311,978	$330,444	($2,132)
Ending balance (in shares) at Dec. 31, 2014	23,998,738	23,998,738

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash dividends declared (in dollars per share)	$0.96	$0.88	$0.84
Retained Earnings
Cash dividends declared (in dollars per share)	$0.96	$0.88	$0.84

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities
Net income	$59,845	$50,254	$42,627
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	11,011	8,490	10,212
(Gain) loss on termination of derivatives			2,227	[1]
Provision for loan losses	10,403	10,200	18,056
Deferred income tax expense (benefit)	2,840	2,557	-1,919
Loss on write-down of investments in securities available for sale	-191	-230	-116
Gain (Loss) on Sale of Other Investments			-76
Net (gain) loss on fixed assets	469	560	-30
Gain on extinguishment of debt	0	-763	0
(Gain) loss on termination of derivatives	1,122	0	-22
Net loss on sale of other real estate owned and foreclosed assets	-723	-606	-996
Realized gain on sale leaseback transaction	-1,034	-1,034	-1,034
Stock based compensation	2,712	2,462	2,845
Excess tax benefit related to equity award activity	-704	-503	-426
Increase in cash surrender value of life insurance policies	-3,128	-3,229	-3,114
Gain on life insurance benefits	-1,964	-227	-1,307
Change in fair value on loans held for sale	18	1	-141
Net change in:
Trading assets	0	0	-265
Loans held for sale	2,012	39,305	-27,828
Other assets	-6,617	48,903	-1,575
Other liabilities	7,258	-16,016	4,408
Total adjustments	24,894	91,081	1,325
Net cash provided by operating activities	84,739	141,335	43,952
Cash flows used in investing activities
Proceeds from sales of securities available for sale	5,438	3,506	2,101
Proceeds from maturities and principal repayments of securities available for sale	47,720	81,727	101,808
Purchases of securities available for sale	-37,047	-47,975	-93,647
Proceeds from maturities and principal repayments of securities held to maturity	44,710	49,165	59,887
Purchases of securities held to maturity	-69,544	-222,027	-34,239
Redemption of Federal Home Loan Bank stock	6,693	3,093	2,290
Investments in Low Income Housing Projects	-10,886	0	0
Purchases of life insurance policies	10,161	267	267
Proceeds from life insurance policies	6,310	0	3,280
Net increase in loans	-266,961	-84,264	-297,394
Cash provided by (used in) business combinations	0	10,520	-8,965
Purchases of bank premises and equipment	-7,678	-9,293	-6,263
Proceeds from the sale of bank premises and equipment	1,219	29	67
Proceeds (payments) on early termination of hedging relationship	-1,122		22
Proceeds from the sale of other real estate owned and foreclosed assets	7,458	9,731	5,649
Net capital improvements to other real estate owned	3,255	2,541	2,268
Net cash used in investing activities	-287,106	-208,596	-267,939
Cash flows provided by financing activities
Net decrease in time deposits	-94,008	-79,136	-21,074
Net increase in other deposits	318,056	300,000	333,488
Net repayments of short-term Federal Home Loan Bank borrowings	-65,000	-50,000
Repayments of long-term Federal Home Loan Bank borrowings	-5,000	-79,946	-79,991
Net decrease in customer repurchase agreements	-1,398	-4,071	-12,769
Net increase (decrease) in other short term borrowings	-5,000	-7,000	1,947
Proceeds from Issuance of Subordinated Long-term Debt	35,000	0	0
Proceeds from exercise of stock options, net of cash paid	2,333	2,475	1,108
Restricted stock awards issued, net of awards surrendered	-641	-669	-467
Excess tax benefit from stock based compensation	704	503	426
Tax benefit from deferred compensation distribution	138	109	92
Issuance of shares under direct stock purchase plan	1,555	969	1,691
Common dividend paid	-22,443	-15,122	-22,494
Net cash provided by financing activities	164,296	68,112	201,957
Net increase (decrease) in cash and cash equivalents	-38,071	851	-22,030
Cash and cash equivalents at beginning of year	216,325	215,474	237,504
Cash and cash equivalents at end of period	178,254	216,325	215,474
Supplemental schedule of noncash investing and financing activities
Interest on deposits and borrowings	20,257	23,475	23,205
Income taxes	14,547	12,171	11,059
Transfer of loans to other real estate owned & foreclosed assets	5,248	2,869	7,061
Capital commitment relating to Low Income Housing Project investments	28,004	51	0
In conjunction with the purchase acquisitions detailed in note 2 to the consolidated financial statements, assets were acquired and liabilities were assumed as follows
Common stock issued for acquisition	0	29,390	30,389
Fair value of assets acquired, net of cash acquired		241,395	547,219
Fair value of liabilities assumed		$222,525	$507,865
[1]	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations
	Independent Bank Corp. (the "Company”) is a bank holding company whose principal subsidiary is Rockland Trust Company (“Rockland Trust” or the “Bank”). Rockland Trust is a state-chartered commercial bank, which operates 75 full service and three limited service retail branches, eleven commercial banking centers, five investment management offices and three mortgage lending centers, all of which are located in Eastern Massachusetts, including Cape Cod, with the exception of an investment management group/commercial lending office located in Providence, Rhode Island. Rockland Trust deposits are insured by the Federal Deposit Insurance Corporation, subject to regulatory limits. The Company’s primary source of income is from providing loans to individuals and small-to-medium sized businesses in its market area. Rockland Trust is a community-oriented commercial bank, and the community banking business is the Company's only reportable operating segment.
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates subsidiaries in which it holds, directly or indirectly, more than 50% of the voting rights and where it exercises control. Entities where the Company holds 20% to 50% of the voting rights, or has the ability to exercise significant influence or both, are accounted for under the equity method. The Company would consolidate entities deemed to be variable interest entities (VIEs) when it is determined to be the primary beneficiary, which is the party involved with the VIE that will absorb a majority of the expected losses, receive a majority of the expected residual returns or both. A legal entity is referred to as a VIE if any of the following conditions exist: (1) the total equity investment at risk is insufficient to permit the legal entity to finance its activities without additional subordinated financial support from other parties, or (2) the entity has equity investors that cannot make significant decisions about the entity’s operations or that do not absorb their proportionate share of the expected losses or receive the expected returns of the entity.
	Reclassification
	Certain previously reported amounts have been reclassified to conform to the current year’s presentation.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make 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 revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for loan losses, income taxes, valuation and potential impairment of investment securities, other-than-temporary impairment (“OTTI”) of certain investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment.
	Significant Concentrations of Credit Risk
	The vast majority of the Bank’s lending activities are conducted in the Commonwealth of Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 10% of the Bank’s loan portfolio.
	Loans originated by the Bank to lessors of nonresidential buildings represented 16.4% and 16.0% of the total loan portfolio as of December 31, 2014 and 2013, respectively. Within this concentration category the Company believes it is well diversified among collateral property types and tenant industries.
	Cash and Cash Equivalents
	For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at the Federal Reserve Bank and Federal Home Loan Bank, and federal funds sold. Generally, federal funds are sold for up to two week periods.
	Securities
	Investment securities are classified at the time of purchase as “available for sale,” “held to maturity,” or “trading.” Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading securities would be recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity or trading, including equity securities with readily determinable fair values, are classified as “available for sale” and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
	Declines in the fair value of held to maturity and available for sale securities below their amortized cost deemed to be OTTI are written down to fair value as determined by a cash flow analysis. To the extent the estimated cash flows do not support the amortized cost, the deficiency is considered to be due to credit loss and recognized in earnings. Unless the Company intends to sell the security, or whether it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery, the remainder of the OTTI charge is considered to be due to other factors, such as liquidity or interest rates, and thus is not recognized in earnings, but rather through other comprehensive income, net of related tax. The Company evaluates individual securities that have fair values below cost for six months or longer, or for a shorter period of time if considered appropriate by management, to determine if the decline in fair value is other-than-temporary. Consideration is given to the obligor of the security, whether the security is guaranteed, whether there is a projected adverse change in cash flows, the liquidity of the security, the type of security, the capital position of security issuers, and payment history of the security, amongst other factors when evaluating such securities.
	Loans Held for Sale
	The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes.
	The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments, forward sales commitments, and forward To Be Announced ("TBA") mortgage contracts. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Direct loan origination costs and fees are deferred upon origination and are recognized on the date of sale.
	Loans
	Loans are carried at the principal amounts outstanding, or amortized acquired fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method.  When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the amortization of any discount or accretion of any premium associated with the loan.
	Loans are generally placed on nonaccrual status if the payment of principal or interest is past due more than 90 days, or sooner if management considers such action to be prudent. As permitted by banking regulations, consumer loans past due 90 days or more may continue to accrue interest, however, such loans are usually charged-off after 120 days of delinquency. As a general rule, a commercial or real estate loan more than 90 days past due with respect to principal or interest is classified as a nonaccrual loan. However, certain commercial and real estate loans that are more than 90 days past due may be kept on an accruing status if the loan is well secured and in the process of collection. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until; it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), management no longer has doubt about the collection of principal and interest, the loan is liquidated, or the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible.  This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform.
	In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring (“TDR”). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring.
	Acquired loans
	All acquired loans are recorded at fair value with no carryover of the allowance for loan losses. At acquisition, loans are also reviewed to determine if the loan has evidence of deterioration in credit quality and to review if it is probable, at acquisition, that all contractually required payments will not be collected. Such loans are deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", is accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired loans are generally considered to be accruing loans because their interest income relates to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans.
	The estimate of cash flows expected to be collected is regularly re-assessed subsequent to acquisition. These re-assessments involve updates, as necessary, of the key assumptions and estimates used in the initial estimate of fair value. Generally speaking, expected cash flows are affected by:
	•	Changes in the expected principal and interest payments over the estimated life - Changes in expected cash flows may be driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows resulting from loan modifications are included in the assessment of expected cash flows.
	•	Change in prepayment assumptions - Prepayments affect the estimated life of the loans, which may change the amount of interest income expected to be collected.
	•	Change in interest rate indices for variable rate loans - Expected future cash flows are based, as applicable, on the variable rates in effect at the time of the assessment of expected cash flows.
	A decrease in expected cash flows in subsequent periods may indicate that the loan is impaired which would likely require the recognition of a charge-off against the allowance for loan losses. An increase in expected cash flows in subsequent periods serves, first, to reduce any previously established allowance for loan losses by the increase in the present value of cash flows expected to be collected, and results in a recalculation of the amount of accretable yield for the loan. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans.
	A PCI loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the event of a sale of the loan, a gain or loss on sale would be recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. For PCI loans accounted for on an individual loan basis and resolved directly with the borrower, any amount received from resolution in excess of the carrying amount of the loan is recognized and reported within interest income.
	A refinancing or modification of a PCI loan accounted for individually is assessed to determine whether the modification represents a TDR. If the loan is considered to be a TDR, it will be included in the total impaired loans reported by the Company. The loan will continue to recognize interest income based upon the excess of cash flows expected to be collected over the carrying amount of the loan.
	Allowance for Loan Losses
	The allowance for loan losses is established based upon the level of estimated probable losses in the current loan portfolio. Loan losses are charged against the allowance when management believes the collectability of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasizes loss factors derived from actual historical portfolio loss rates, which are combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Allowance amounts are determined based on an estimate of the historical average annual percentage rate of loan loss for each loan category, a temporal estimate of the incurred loss emergence and confirmation period for each loan category, and certain qualitative risk factors considered in the computation of the allowance for loan losses.
	The qualitative risk factors impacting the inherent risk of loss within the portfolio include the following:
	•	National and local economic and business conditions
	•	Level and trend of delinquencies
	•	Level and trend of charge-offs and recoveries
	•	Trends in volume and terms of loans
	•	Risk selection, lending policy and underwriting standards
	•	Experience and depth of management
	•	Banking industry conditions and other external factors
	•	Concentration risk
	The formula-based approach evaluates groups of loans with common characteristics, which consist of similar loan types with similar terms and conditions, to determine the appropriate allocation within each portfolio section. This approach incorporates qualitative adjustments based upon management’s assessment of various market and portfolio specific risk factors into its formula-based estimate. Due to the imprecise nature of the loan loss estimation process and ever changing conditions, the qualitative risk attributes may not adequately capture amounts of incurred loss in the formula-based loan loss components used to determine the Bank’s analysis of the adequacy of the allowance for loan losses.
	The Bank evaluates certain loans within the commercial and industrial, commercial real estate, commercial construction and small business portfolios individually for specific impairment. A loan is considered impaired when, based on current information and events, it is probable that 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, contractual interest rates 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. Loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification, troubled debt restructuring or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of the probable loss is able to be estimated. Estimates of loss may be determined by the present value of anticipated future cash flows, the loan’s observable fair market value, or the fair value of the collateral, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral less costs to sell is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible.
	Large groups of small-balance homogeneous loans such as the residential real estate, residential construction, home equity and other consumer portfolios are collectively evaluated for impairment. As such, the Bank does not typically identify individual loans within these groupings as impaired loans for impairment evaluation and disclosure. However, the Bank evaluates all TDRs for impairment on an individual loan basis regardless of loan type.
	In the ordinary course of business, the Bank enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The reserve for unfunded lending commitments is included in other liabilities in the balance sheet. At December 31, 2014 and 2013, the reserve for unfunded loan commitments was $813,000 and $716,000, respectively.
	Transfers and Servicing of Financial Assets
	Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
	Servicing assets are recognized as separate assets when rights are acquired through sale of loans with servicing rights retained. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income.
	Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan, and are recorded as income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income.
	Federal Home Loan Bank Stock
	The Company, as a member of the Federal Home Loan Bank (“FHLB”) of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if OTTI exists. The Company reviews recent public filings, rating agency analysis and other factors, when making its determination.
	Bank Premises and Equipment
	Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years.
	Goodwill and Identifiable Intangible Assets
	Goodwill is the price paid which exceeds the net fair value of acquired businesses and is not amortized. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, the two step quantitative impairment test is performed. Step one of the quantitative impairment test compares book value to the fair value of the reporting unit. If test one is failed, a more detailed analysis is performed, which involves measuring the excess of the fair value of the reporting unit, as determined in step one, over the aggregate fair value of the individual assets, liabilities, and identifiable intangibles as if the reporting unit was being acquired in a business combination.
	Identifiable intangible assets subject to amortization consist of core deposit intangibles, noncompete agreements, customer lists, as well as a brand name, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. Identifiable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The range of useful lives is as follows:
	Core deposit intangibles	9-10 years
	Noncompete agreements	2-3 years
	Customer lists	10 years
	Brand name	5 years
Leases	29 years
The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets.
Impairment of Long-Lived Assets Other Than Goodwill
The Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs undiscounted cash flow analysis to determine if impairment exists. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal.
Cash Surrender Value of Life Insurance Policies
Increases in the cash surrender value (“CSV”) of life insurance policies, as well as benefits received net of any CSV, are recorded in other noninterest income, and are not subject to income taxes. The CSV of the policies are recorded as assets of the Bank, with liabilities recognized for any split dollar arrangements associated with the policies. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. A life insurance policy with any individual carrier is limited to 15% of Tier 1 capital (as defined for regulatory purposes) and the total CSV of life insurance policies is limited to 25% of Tier 1 capital.
Other Real Estate Owned and Other Foreclosed Assets
Real estate properties and other assets, which have served as collateral to secure loans, are held for sale and are initially recorded at fair value less estimated costs to sell at the date control is established, resulting in a new cost basis. The amount by which the recorded investment in the loan exceeds the fair value (net of estimated costs to sell) of the foreclosed asset is charged to the allowance for loan losses. Subsequent declines in the fair value of the foreclosed asset below the new cost basis are recorded through the use of a valuation allowance. Subsequent increases in the fair value are recorded as reductions in the valuation allowance, but not below zero. Upon a sale of a foreclosed asset, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the foreclosed asset is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses and changes in the valuation allowance relating to foreclosed assets are included in other noninterest expense.
Derivatives
Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is determined by whether it has been designated and qualifies as part of a hedging relationship, and further, by the type of hedging relationship. At the inception of a hedge, the Company documents certain items, including but not limited to the following: the relationship between hedging instruments and hedged items, the Company risk management objectives, hedging strategies, and the evaluation of hedge transaction effectiveness. Documentation includes linking all derivatives designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions.
For those derivative instruments that are designated and qualify as hedging instruments, the Company designates the hedging instrument, based upon the exposure being hedged, as either a fair value hedge or a cash flow hedge. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income, net of related tax, and reclassified into earnings in the same period or periods during which the hedged transactions affect earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item (i.e., the ineffective portion), if any, is recognized in current earnings during the period. For derivative instruments designated and qualifying as a fair value hedge (i.e., hedging the exposure to changes in the fair value of an asset or liability or an identified portion thereof that is attributable to the hedged risk), the gain or loss on the derivative instrument, as well as the offsetting gain or loss on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. Hedge accounting is discontinued prospectively when (1) a derivative is no longer highly effective in offsetting changes in the fair value or cash flow of a hedged item, (2) a derivative expires or is settled, (3) it is no longer likely that a forecasted transaction associated with the hedge will occur, or (4) it is determined that designation of a derivative as a hedge is no longer appropriate.
To the extent the Company enters into new or re-designates existing hedging relationships, it is the Company's policy to include the Overnight Index Swap Rate in the spectrum of available benchmark interest rates for hedge accounting.
For derivative instruments not designated as hedging instruments, such as loan level derivatives, foreign exchange contracts and mortgage derivatives, changes in fair value are recognized in other noninterest income during the period of change.
Retirement Plans
The Company has various retirement plans in place for current and former employees, including postretirement benefit plans, supplemental executive retirement plans and frozen multiemployer pension plans.
The postretirement benefit plans and the supplemental executive retirement plans are unfunded and therefore have no plan assets. The actuarial cost method used to compute the benefit liabilities and related expense is the projected unit credit method. The projected benefit obligation is principally determined based on the present value of the projected benefit distributions at an assumed discount rate. The discount rate which is utilized is based on the investment yield of high quality corporate bonds available in the market place with maturities approximately equal to projected cash flows of future benefit payments as of the measurement date. Periodic benefit expense (or income) includes service costs and interest costs based on the assumed discount rate, amortization of prior service costs due to plan amendments and amortization of actuarial gains and losses. The underfunded status of the plans is recorded as a liability on the balance sheet.
The multiemployer pension plans assets are determined based on fair value, generally representing observable market prices. The actuarial cost method used to compute the pension liabilities and related expense is the unit credit method. The pension expense is equal to the plan contribution requirement of the Company for the plan year.
Stock-Based Compensation
The Company recognizes stock-based compensation based on the grant-date fair value of the award adjusted for forfeitures. For restricted stock awards and units, the Company recognizes compensation expense ratably over the vesting period for the fair value of the award, measured at the grant date. For stock option awards, the Company values awards granted using the Black-Scholes option-pricing model. The Company recognizes compensation expense for these awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.
Income Taxes
Deferred income tax assets and liabilities are determined using the asset and liability (or balance sheet) method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current available information raises doubt as to the realization of the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income in the period that includes the enactment date. Income taxes are allocated to each entity in the consolidated group based on its share of taxable income. Management exercises significant judgment in evaluating the amount and timing of recognition of the resulting tax liabilities and assets, including projections of future taxable income. Additionally, a liability for unrecognized tax benefits is recorded for uncertain tax positions taken by the Company on its tax returns for which there is less than a 50% likelihood of being recognized upon a tax examination.
Tax credits generated from the New Markets Tax Credit program are reflected in earnings when realized for federal income tax purposes.
Low Income Housing Tax Credits
The Company accounts for its investments in qualified affordable housing projects using the proportional amortization method. Under the proportional amortization method the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits, received and recognizes the net investment performance as a component of income tax expense.
Assets Under Administration
Assets held in a fiduciary or agency capacity for customers are not included in the accompanying consolidated balance sheet, as such assets are not assets of the Company. Revenue from administrative and management activities associated with these assets is recorded on an accrual basis.
Extinguishment of Debt
Upon extinguishment of an outstanding debt, the Company records the difference between the exit price and the net carrying amount of the debt as a gain or loss on the extinguishment. The gain or loss would be a component of other noninterest income or other noninterest expense, respectively.
Earnings Per Share
Basic earnings per share is calculated using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated from common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Under this method, all earnings distributed and undistributed, are allocated to participating securities and common shares based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities (i.e. unvested restricted stock), not subject to performance based measures. Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding (inclusive of participating securities). Diluted earnings per share have been calculated in a manner similar to that of basic earnings per share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if all potentially dilutive common shares (such as those resulting from the exercise of stock options or the attainment of performance measures) were issued during the period, computed using the treasury stock method.
Comprehensive Income
Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale, unrealized losses related to factors other than credit on debt securities, unrealized gains and losses on cash flow hedges, deferred gains on hedge accounting transactions, and changes in the funded status of the Company’s postretirement and supplemental retirement plans.
Fair Value Measurements
In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial statements are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters.
Recent Accounting Standards
FASB ASC Topic 805 "Business Combinations" Update No. 2014-17. Update No. 2014-17 was issued in November 2014 to provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. An acquired entity should determine whether to elect to apply pushdown accounting for each individual change-in-control event in which an acquirer obtains control of the acquired entity. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period to the acquired entity's most recent change-in-control event. An election to apply pushdown accounting in a reporting period in which the change-in-control event occurred should be considered a change in accounting principle in accordance with Topic 250, Accounting Changes and Error Corrections. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. The amendments in this Update are effective on November 18, 2014. The adoption of this standard did not have a material impact on the Company's consolidated financial position.
FASB ASC Subtopic 205-40 "Presentation of Financial Statements - Going Concern" Update No. 2014-15. Update No. 2014-15 was issued in August 2014 to provide guidance in U.S. Generally accepted accounting principles ("GAAP") about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. In doing so, the amendments should reduce diversity in the timing and content of footnote disclosures. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
FASB ASC Subtopic 310-40 "Receivables - Troubled Debt Restructurings by Creditors" Update No. 2014-14. Update No. 2014-14 was issued in August 2014 to address the diversity in practice related to how creditors classify government-guaranteed mortgage loans, including Federal Housing Administration (FHA) or the U.S. Department of Veterans Affairs (VA) guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The objective of this update is to reduce that diversity by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
FASB ASC Topic 718 "Compensation - Stock Compensation" Update No. 2014 -12. Update No. 2014-12 was issued in June 2014 to resolve the diverse accounting treatment of share-based payment awards that require, as a condition to vesting, achievement of a specific performance target after the requisite service period. Many reporting entities account for these performance targets as performance conditions that affect the vesting of the award and, therefore, do not reflect the performance target in the estimate of the grant-date fair value of the award, while other reporting entities treat those performance targets as nonvesting conditions that affect the grant-date fair value of the award. This amendment requires that these performance targets that affect vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718 "Compensation - Stock Compensation" as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
FASB ASC Topic 860 "Transfers and Servicing" Update No. 2014-11. Update No. 2014-11 was issued in June 2014 to respond to stakeholders' concerns about current accounting and disclosures for repurchase agreements and similar transactions.  The amendments in this Update require two accounting changes.  First, the amendments in this Update change the accounting for repurchase-to-maturity transactions to secured borrowing accounting.  Second, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement.  The amendments in this Update require disclosures for certain transactions comprising (1) a transfer of a financial asset accounted for as a sale and (2) an agreement with the same transferee entered into in contemplation of the initial transfer that results in the transferor retaining substantially all of the exposure to the economic return on the transferred financial asset throughout the term of the transaction. For those transactions outstanding at the reporting date, the transferor is required to disclose certain information by type of transaction.  The amendments in this Update also require certain disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The accounting changes in this Update are effective for public business entities for the first interim or annual period beginning after December 15, 2014. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Earlier application for a public business entity is prohibited. For public business entities, the disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The disclosures are not required to be presented for comparative periods before the effective date.  The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
FASB ASC Topic 606 "Revenue from Contracts with Customers" Update No. 2014-09. Update No. 2014-09 was issued in May 2014 to address the previous revenue recognition requirements in GAAP that differ from those in International Financial Reporting Standards (IFRS).  Accordingly, the Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) initiated a joint project to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For public entities, the standard is effective for annual and interim periods beginning after December 15, 2016, and calendar year-end public entities will apply it in the quarter that ends March 31, 2017.  Early adoption is not permitted.  We are currently assessing the potential impact of this amendment on our consolidated financial position.
FASB ASC Subtopic 310-40 "Receivables - Troubled Debt Restructurings by Creditors" Update No. 2014-04. Update No. 2014-04 was issued in January 2014 to reduce diversity by clarifying when an in substance repossession of 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 amendments in this update clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in the update should be applied prospectively and are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS
	Mayflower Bancorp, Inc.
	On November 15, 2013, the Company completed its acquisition of Mayflower Bancorp, Inc. ("Mayflower"), the parent of Mayflower Co-operative Bank. The transaction qualified as a tax-free reorganization for federal income tax purposes and Mayflower shareholders received either the right to receive $17.50 in cash per share or 0.565 shares of the Company's stock (valued at $20.28 per share, based upon the highest trading value of the Company's stock on November 15, 2013 of $35.90). The total deal consideration was $40.3 million and was comprised of 30% cash and 70% stock consideration. The cash consideration was $10.9 million in the aggregate, inclusive of cash paid in lieu of fractional shares. The total stock consideration was $29.4 million and resulted in an increase to the Company's outstanding shares of 818,650 shares. In addition to increasing its loan and deposit base, the Company will be able to provide a deeper product set to new customers, as well as benefit from increased operating synergies, improving the long-term operating and financial results of the Company.
	The Company accounted for the acquisition using the acquisition method pursuant to the Business Combinations Topic of the FASB ASC. Accordingly, the Company recorded merger and acquisition expenses of $6.9 million during the year ended December 31, 2013. Additionally, the acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition:
		Net Assets Acquired at Fair Value
		(Dollars in thousands)
	Assets
	Cash	$	21,390
	Investments	77,953
	Loans	126,570
	Premises and equipment	7,128
	Goodwill	20,030
	Core deposit intangible	2,610
	Other assets	7,104
	Total assets acquired	262,785
	Liabilities
	Deposits	218,877
	Borrowings	1,121
	Other liabilities	2,527
	Total liabilities assumed	222,525
	Purchase price	$	40,260
	Fair value adjustments to assets acquired (other than PCI loans, see Note 1, "Summary of Significant Accounting Policies" herein) and liabilities assumed are generally amortized using either an effective yield or straight-line basis over periods consistent with the average life, useful life and/or contractual term of the related assets and liabilities.
	Fair values of the major categories of assets acquired and liabilities assumed were determined as follows:
	Cash and Cash Equivalents
	The fair values of cash and cash equivalents approximate the respective carrying amounts because the instruments are payable on demand or have short-term maturities.
	Investments
	The fair values of securities were based on quoted market prices for identical securities received from an independent, nationally-recognized, third-party pricing service. When quoted market prices for identical securities were unavailable, prices provided by the independent pricing service were based on recent trading activity and other observable information including, but not limited to, market interest rate curves, referenced credit spreads and estimated prepayment rates where applicable.
	Loans
	The loans acquired were recorded at fair value without a carryover of the allowance for loan losses. Fair value of the loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then applying a market-based discount rate to those cash flows. The overall discount on the loans acquired in this transaction was due primarily to anticipated credit loss, as well as considerations for liquidity and market interest rates. For the year ended December 31, 2013 the Company recorded approximately $641,000 of interest income attributable to these acquired loans since the acquisition date.
	A portion of the loans acquired showed evidence of deterioration of credit quality at the purchase date and was deemed unlikely that the Bank will be able to collect all contractually required payments. As such, these loans were deemed to be PCI and the carrying value and prospective income recognition are predicated upon future cash flows expected to be collected. The following is a summary of these PCI loans associated with the acquisition as of the date acquired:
			(Dollars in thousands)
	Contractually required principal and interest at acquisition		$	4,440
	Contractual cash flows not expected to be collected		(1,296		)
	Expected cash flows at acquisition		3,144
	Interest component of expected cash flows		(386		)
	Basis in PCI loans at acquisition - estimated fair value		$	2,758
	Core Deposit Intangible
	The fair value of the core deposit intangible is derived by comparing the interest rate and servicing costs that the financial institution pays on the core deposit liability versus the current market rate for alternative sources of financing. The intangible asset represents the stable and relatively low cost source of funds that the deposits and accompanying relationships provide the Company, when compared to alternative funding sources.
	Premises and Equipment
	The fair value of Mayflower's premises, including land, buildings and improvements, was determined based upon appraisal by licensed real estate appraisers or pending agreed upon sale prices. The appraisals were based upon the best and highest use of the property with final values determined based upon an analysis of the cost, sales comparison and income capitalization approaches for each property appraised.
	Deposits
	The fair value of acquired savings and transaction deposit accounts was assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. The fair value of time deposits were determined based on the present value of the contractual cash flows over the remaining period to maturity using a market interest rate.
	Borrowings
	The fair values of FHLB advances were derived based upon the present value of the principal and interest payments using a current market discount rate.
	Selected Pro Forma Results
	The following summarizes the unaudited pro forma results of operations as if the Company acquired Mayflower on January 1, 2013 (2012 amounts represent combined results for the Company and Mayflower). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period.
		Years Ended December 31
		2013				2012
		(Dollars in thousands)
	Net interest income after provision for loan losses	$	178,556			$	162,781
	Net income	55,103				44,133
	Excluded from the pro forma results of operations for the year ended December 31, 2013 are merger costs, net of tax, of $4.5 million, or $0.19 per diluted share, respectively, primarily made up of contract terminations arising due to the change in control, the acceleration of certain compensation and benefit costs, and other merger expenses.
	Central Bancorp, Inc.
	On November 9, 2012, the Company completed its acquisition of Central Bancorp, Inc. (“Central”), the parent of Central Co-operative Bank. The transaction qualified as a tax-free reorganization for federal income tax purposes and Central shareholders received either the right to receive $32.00 in cash per share or 1.0533 shares of the Company's stock (valued at $29.95 per share, based upon the highest trading value of the Company's stock on November 9, 2012 of $28.44). The total deal consideration was $52.0 million and was comprised of 40% cash and 60% stock consideration. The cash consideration was $21.6 million in the aggregate, inclusive of cash paid in lieu of fractional shares. The total stock consideration was $30.4 million and resulted in an increase to the Company's outstanding shares of 1,068,514 shares. In addition to increasing its loan and deposit base, the Company will be able to provide a deeper product set to new customers, as well as benefit from increased operating synergies, improving the long-term operating and financial results of the Company.
	The Company accounted for the acquisition using the acquisition method pursuant to the Business Combinations Topic of the FASB ASC. Accordingly, the Company recorded merger and acquisition expenses of $1.8 million and $6.7 million during the years ended December 31, 2013 and 2012, respectively. Additionally, the acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition:
		Net Assets Acquired at Fair Value
		(Dollars in thousands)
	Assets
	Cash	$	12,683
	Investments	28,268
	Loans	450,671
	Premises and equipment	6,277
	Goodwill	22,544
	Core deposit intangible	2,150
Other assets	37,309
Total assets acquired	559,902
Liabilities
Deposits	357,434
Borrowings	144,920
Other liabilities	5,511
Total liabilities assumed	507,865
Purchase price	$	52,037
As noted above, the Company acquired loans at fair value of $450.7 million. Subsequent to the acquisition, on November 9, 2012, the Company sold approximately $42.2 million of performing jumbo residential mortgages acquired in the transaction and paid down $25.0 million of acquired Federal Home Loan Bank Advances.
Fair value adjustments to assets acquired (other than PCI loans, see Note 1, "Summary of Significant Accounting Policies" herein.) and liabilities assumed are generally amortized using either an effective yield or straight-line basis over periods consistent with the average life, useful life and / or contractual term of the related assets and liabilities.
Fair values of the major categories of assets acquired and liabilities assumed were determined as follows:
Cash and Cash Equivalents
The fair values of cash and cash equivalents approximate the respective carrying amounts because the instruments are payable on demand or have short-term maturities.
Investments
The fair values of securities were based on quoted market prices for identical securities received from an independent, nationally-recognized, third-party pricing service. When quoted market prices for identical securities were unavailable, prices provided by the independent pricing service were based on recent trading activity and other observable information including, but not limited to, market interest rate curves, referenced credit spreads and estimated prepayment rates where applicable.
Loans
The loans acquired were recorded at fair value without a carryover of the allowance for loan losses. Fair value of the loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then applying a market-based discount rate to those cash flows. The overall discount on the loans acquired in this transaction was due primarily to anticipated credit loss, as well as considerations for liquidity and market interest rates. For the year ended December 31, 2012 the Company recorded approximately $3.1 million of interest income attributable to these acquired loans since the acquisition date.
A portion of the loans acquired showed evidence of deterioration of credit quality at the purchase date and was deemed unlikely that the Bank will be able to collect all contractually required payments. As such, these loans were deemed to be PCI and the carrying value and prospective income recognition are predicated upon future cash flows expected to be collected. The following is a summary of these PCI loans associated with the acquisition as of the date acquired:
		(Dollars in thousands)
Contractually required principal and interest at acquisition		$	47,548
Contractual cash flows not expected to be collected		(8,733		)
Expected cash flows at acquisition		38,815
Interest component of expected cash flows		(3,095		)
Basis in PCI loans at acquisition - estimated fair value		$	35,720
Core Deposit Intangible
The fair value of the core deposit intangible is derived by comparing the interest rate and servicing costs that the financial institution pays on the core deposit liability versus the current market rate for alternative sources of financing. The intangible asset represents the stable and relatively low cost source of funds that the deposits and accompanying relationships provide the Company, when compared to alternative funding sources.
Deposits
The fair value of acquired savings and transaction deposit accounts was assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. The fair value of time deposits were determined based on the present value of the contractual cash flows over the remaining period to maturity using a market interest rate.
Borrowings
The fair values of these borrowings were derived based upon present value of the principal and interest payments using a current market discount rate.
Selected Pro Forma Results
The following summarizes the unaudited pro forma results of operations as if the Company acquired Central on January 1, 2012 (2011 amounts represent combined results for the Company and Central). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period.
	Years Ended December 31
	2012				2011
	(Dollars in thousands)
Net interest income after provision for loan losses	$	165,860			$	170,514
Net income	47,261				46,477
Excluded from the pro forma results of operations for the year ended December 31, 2012 are merger costs, net of tax, of $4.5 million, or $0.20 per diluted share, respectively, primarily made up of contract terminations arising due to the change in control, the acceleration of certain compensation and benefit costs, and other merger expenses.

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES
	Trading Securities
	During 2012 the Company transferred equity securities classified previously as trading to available for sale. The majority of these securities are held solely for the purpose of funding certain executive nonqualified retirement obligations (see Note 15 “Employee Benefit Plans”). The remainder of the portfolio is comprised of equity securities, which consists of a fund whose investment objective is to invest in geographically specific private placement debt securities designed to support underlying economic activities such as community development and affordable housing. The Company realized a gain on trading activities of $285,000 in 2012, which was included in other income.
	Available for Sale and Held to Maturity Securities
	The following table presents a summary of the amortized cost, gross unrealized holding gains and losses, other-than-temporary impairment recorded in other comprehensive income and fair value of securities available for sale and securities held to maturity for the periods indicated:
		December 31, 2014													December 31, 2013
		Amortized			Gross			Gross Unrealized			Fair				Amortized			Gross		Gross Unrealized			Fair
		Cost			Unrealized			Losses			Value				Cost			Unrealized		Losses			Value
					Gains													Gains
		(Dollars in thousands)
	Available for sale securities
	U.S. government agency securities	$	41,369		$	139		$	(22	)	$	41,486			$	41,331		$	3	$	(885	)	$	40,449
	Agency mortgage-backed securities	211,168			7,203			(693		)	217,678				232,742			6,405		(4,556		)	234,591
	Agency collateralized mortgage obligations	63,059			599			(623		)	63,035				58,765			490		(1,102		)	58,153
	State, county, and municipal securities	5,106			117			—			5,223				5,439			1		(28		)	5,412
	Single issuer trust preferred securities issued by banks	2,913			12			(16		)	2,909				2,960			14		(22		)	2,952
	Pooled trust preferred securities issued by banks and insurers (1)	7,906			195			(1,780		)	6,321				8,083			—		(4,242		)	3,841
	Equity securities	11,572			567			(237		)	11,902				10,997			762		(295		)	11,464
	Total available for sale securities	$	343,093		$	8,832		$	(3,371	)	$	348,554			$	360,317		$	7,675	$	(11,130	)	$	356,862
	Held to maturity securities
	U.S. treasury securities	$	1,010		$	63		$	—		$	1,073			$	1,011		$	31	$	—		$	1,042
	Agency mortgage-backed securities	159,522			5,422			—			164,944				155,067			1,917		(1,033		)	155,951
	Agency collateralized mortgage obligations	207,995			2,141			(3,478		)	206,658				187,388			824		(6,176		)	182,036
	State, county, and municipal securities	424			4			—			428				678			7		—			685
	Single issuer trust preferred securities issued by banks	1,500			—			(23		)	1,477				1,503			23		—			1,526
	Corporate debt securities	5,002			117			—			5,119				5,005			210		—			5,215
	Total held to maturity securities	$	375,453		$	7,747		$	(3,501	)	$	379,699			$	350,652		$	3,012	$	(7,209	)	$	346,455
	Total	$	718,546		$	16,579		$	(6,872	)	$	728,253			$	710,969		$	10,687	$	(18,339	)	$	703,317
	-1	Gross unrealized gains and gross unrealized losses include $230,000 and $2.3 million of net non-credit related OTTI at December 31, 2014 and December 31, 2013, respectively.
	When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The following table shows the gross realized gains and losses on available for sale securities for the periods indicated:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Gross realized gains on fixed income securities	$	121			$	258			$	5
	Gross realized losses on fixed income securities	(21		)		—				—
	Gain (loss) on equity investments	$	91			$	(28	)		$	111
	Net gains on investments	$	191			$	230			$	116
	The actual maturities of certain securities may differ from the contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2014 is presented below:
		Available for Sale								Held to Maturity
		Amortized				Fair				Amortized				Fair
		Cost				Value				Cost				Value
		(Dollars in thousands)
	Due in one year or less	$	—			$	—			$	200			$	202
	Due after one year to five years	36,094				36,819				5,454				5,586
	Due after five to ten years	90,680				91,060				31,805				32,429
	Due after ten years	204,747				208,773				337,994				341,482
	Total debt securities	$	331,521			$	336,652			$	375,453			$	379,699
	Equity securities	$	11,572			$	11,902			$	—			$	—
	Total	$	343,093			$	348,554			$	375,453			$	379,699
	Inclusive in the table above is $34.8 million of callable securities at December 31, 2014.
	The carrying value of securities pledged to secure public funds, trust deposits, repurchase agreements and for other purposes, as required or permitted by law, was $340.0 million and $360.1 million at December 31, 2014 and 2013, respectively.
	At December 31, 2014 and 2013, the Company had no investments in obligations of individual states, counties, or municipalities, which exceeded 10% of stockholders’ equity.
	Other-Than-Temporary Impairment
	The Company continually reviews investment securities for the existence of OTTI, taking into consideration current market conditions, the extent and nature of changes in fair value, issuer rating changes and trends, the credit worthiness of the obligor of the security, volatility of earnings, current analysts’ evaluations, the Company’s intent to sell the security, or whether it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery, as well as other qualitative factors. The term “other-than-temporary” is not intended to indicate that the decline is permanent, but indicates that the prospects for a near-term recovery of value is not necessarily favorable, or that there is a lack of evidence to support a realizable value equal to or greater than the carrying value of the investment.
	The following tables show the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company has not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
					31-Dec-14
					Less than 12 months								12 months or longer							Total
	Description of securities	# of			Fair Value				Unrealized				Fair				Unrealized			Fair Value				Unrealized
		holdings							Losses				Value				Losses							Losses
					(Dollars in thousands)
	U.S. government agency securities	22			$	21,950			$	(22	)		$	—			$	—		$	21,950			$	(22	)
	Agency mortgage-backed securities	17			3,471				(1		)		42,222				(692		)	45,693				(693		)
	Agency collateralized mortgage obligations	14			35,083				(331		)		94,974				(3,770		)	130,057				(4,101		)
	Single issuer trust preferred securities issued by banks and insurers	2			2,553				(39		)		—				—			2,553				(39		)
Pooled trust preferred securities issued by banks and insurers	2			—				—				2,681				(1,356		)	2,681				(1,356		)
Equity securities	23			1,480				(74		)		4,072				(163		)	5,552				(237		)
Total temporarily impaired securities	80			$	64,537			$	(467	)		$	143,949			$	(5,981	)	$	208,486			$	(6,448	)
				31-Dec-13
				Less than 12 months								12 months or longer							Total
Description of securities	# of			Fair Value				Unrealized				Fair				Unrealized			Fair Value				Unrealized
	holdings							Losses				Value				Losses							Losses
				(Dollars in thousands)
U.S.government agency securities	39			$	39,950			$	(885	)		$	—			$	—		$	39,950			$	(885	)
Agency mortgage-backed securities	124			202,004				(5,217		)		5,108				(372		)	207,112				(5,589		)
Agency collateralized mortgage obligations	19			183,721				(7,278		)		—				—			183,721				(7,278		)
State, county, and municipal securities	13			3,838				(28		)		—				—			3,838				(28		)
Single issuer trust preferred securities issued by banks and insurers	2			1,341				(22		)		—				—			1,341				(22		)
Pooled trust preferred securities issued by banks and insurers	2			—				—				2,300				(1,913		)	2,300				(1,913		)
Equity securities	22			2,376				(90		)		3,520				(205		)	5,896				(295		)
Total temporarily impaired securities	221			$	433,230			$	(13,520	)		$	10,928			$	(2,490	)	$	444,158			$	(16,010	)
The Company does not intend to sell these investments and has determined based upon available evidence that it is more likely than not that the Company will not be required to sell the security before the recovery of its amortized cost basis. As a result, the Company does not consider these investments to be OTTI. The Company made this determination by reviewing various qualitative and quantitative factors regarding each investment category, such as current market conditions, extent and nature of changes in fair value, issuer rating changes and trends, volatility of earnings, and current analysts’ evaluations.
As a result of the Company’s review of these qualitative and quantitative factors, the causes of the impairments listed in the table above by category are as follows at December 31, 2014:
•	U.S. Government Agency Securities, Agency Mortgage-Backed Securities and Collateralized Mortgage Obligations: This portfolio has contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. Government or one of its agencies.
•	Single Issuer Trust Preferred Securities: This portfolio consists of two securities, one of which is below investment grade. The unrealized loss on these securities is attributable to the illiquid nature of the trust preferred market in the current economic environment. Management evaluates various financial metrics for each of the issuers, including regulatory capital ratios of the issuers.
•	Pooled Trust Preferred Securities: This portfolio consists of two below investment grade securities both of which are performing. The unrealized loss on these securities is attributable to the illiquid nature of the trust preferred market and the significant risk premiums required in the current economic environment. Management evaluates collateral credit and instrument structure, including current and expected deferral and default rates and timing. In addition, discount rates are determined by evaluating comparable spreads observed currently in the market for similar instruments.
•	Equity Securities: This portfolio consists of mutual funds and other equity investments. During some periods, the mutual funds in the Company’s investment portfolio may have unrealized losses resulting from market fluctuations as well as the risk premium associated with that particular asset class. For example, emerging market equities tend to trade at a higher risk premium than U.S. government bonds and thus, will fluctuate to a greater degree on both the upside and the downside. In the context of a well-diversified portfolio, however, the correlation amongst the various asset classes represented by the funds serves to minimize downside risk. The Company evaluates each mutual fund in the portfolio regularly and measures performance on both an absolute and relative basis. A reasonable recovery period for positions with an unrealized loss is based on management’s assessment of general economic data, trends within a particular asset class, valuations, earnings forecasts and bond durations.
The following table shows the total OTTI that the Company recorded for the periods indicated:
	Years Ended December 31
	2014				2013				2012
	(Dollars in thousands)
Gross change in OTTI recorded on certain investments	$	2,098			$	588			$	678
Portion of OTTI recognized in OCI	(2,098		)		(588		)		(754		)
Total credit related OTTI recognized in earnings	$	—			$	—			$	(76	)
The following table shows the cumulative credit related component of OTTI for the periods indicated:
	2014				2013				2012
	(Dollars in thousands)
Balance at beginning of period	$	(9,997	)		$	(10,847	)		$	(10,771	)
Add
Incurred on securities not previously impaired	—				—				—
Incurred on securities previously impaired	—				—				(76		)
Less
Securities sold during the period	—				850				—
Reclassification due to changes in Company’s intent	—				—				—
Increases in cash flow expected to be collected	—				—				—
Balance at end of period	$	(9,997	)		$	(9,997	)		$	(10,847	)

LOANS_ALLOWANCE_FOR_LOAN_LOSSE

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	12 Months Ended
	Dec. 31, 2014
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY
	Allowance for Loan Losses
	The following table summarizes changes in the allowance for loan losses by loan category and bifurcates the amount of allowance allocated to each loan category based on collective impairment analysis and loans evaluated individually for impairment:
		31-Dec-14
		Commercial				Commercial				Commercial				Small				Residential				Home			Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Equity
		Industrial																Estate
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	15,622			$	24,541			$	3,371			$	1,215			$	2,760			$	5,036		$	694		$	53,239
	Charge-offs	(2,097		)		(5,454		)		—				(605		)		(826		)		(750		)	(1,215		)	(10,947		)
	Recoveries	462				404				—				275				424				249			591			2,405
	Provision	1,586				6,382				574				286				476				421			678			10,403
	Ending balance	$	15,573			$	25,873			$	3,945			$	1,171			$	2,834			$	4,956		$	748		$	55,100
	Ending balance: individually evaluated for impairment	$	412			$	197			$	—			$	7			$	1,500			$	262		$	38		$	2,416
	Ending balance: collectively evaluated for impairment	$	15,161			$	25,676			$	3,945			$	1,164			$	1,334			$	4,694		$	710		$	52,684
	Financing receivables ending balance:
	Individually evaluated for impairment	$	4,654			$	30,729			$	311			$	1,088			$	15,055			$	5,330		$	868		$	58,035
	Collectively evaluated for impairment	856,185				2,304,099				265,501				84,159				505,799				858,305			16,335			4,890,383
	Purchase credit impaired loans	—				12,495				182				—				9,405				228			5			22,315
	Total loans by group	$	860,839			$	2,347,323			$	265,994			$	85,247			$	530,259			$	863,863		$	17,208		$	4,970,733		-1
		31-Dec-13
		Commercial				Commercial				Commercial				Small				Residential				Home			Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Equity
		Industrial																Estate
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	13,461			$	22,598			$	2,811			$	1,524			$	2,930			$	7,703		$	807		$	51,834
	Charge-offs	(2,683		)		(3,587		)		(308		)		(773		)		(622		)		(1,370		)	(1,175		)	(10,518		)
	Recoveries	272				206				100				279				143				135			588			1,723
	Provision	$	4,572			$	5,324			$	768			$	185			$	309			$	(1,432	)	$	474		$	10,200
	Ending balance	$	15,622			$	24,541			$	3,371			$	1,215			$	2,760			$	5,036		$	694		$	53,239
	Ending balance: individually evaluated for impairment	$	1,150			$	765			$	—			$	109			$	1,564			$	116		$	70		$	3,774
	Ending balance: collectively evaluated for impairment	$	14,472			$	23,776			$	3,371			$	1,106			$	1,196			$	4,920		$	624		$	49,465
	Financing receivables ending balance:
	Individually evaluated for impairment	$	9,148			$	39,516			$	100			$	1,903			$	15,200			$	4,890		$	1,298		$	72,055
	Collectively evaluated for impairment	775,053				2,191,132				223,562				75,337				515,854				816,925			18,845			4,616,708
	Purchase credit impaired loans	1				18,612				197				—				10,389				326			19			29,544
	Total loans by group	$	784,202			$	2,249,260			$	223,859			$	77,240			$	541,443			$	822,141		$	20,162		$	4,718,307		-1
		31-Dec-12
		Commercial				Commercial				Commercial				Small				Residential							Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Home
		Industrial																Estate				Equity
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	11,682			$	23,514			$	2,076			$	1,896			$	3,113			$	4,597		$	1,382		$	48,260
	Charge-offs	(6,191		)		(4,348		)		—				(616		)		(1,094		)		(3,178		)	(1,165		)	(16,592		)
	Recoveries	963				188				—				134				151				93			581			2,110
	Provision	7,007				3,244				735				110				760				6,191			9			18,056
	Ending balance	$	13,461			$	22,598			$	2,811			$	1,524			$	2,930			$	7,703		$	807		$	51,834
	Ending balance: individually evaluated for impairment	$	1,084			$	516			$	—			$	353			$	1,302			$	35		$	130		$	3,420
	Ending balance: collectively evaluated for impairment	$	12,377			$	22,082			$	2,811			$	1,171			$	1,628			$	7,668		$	677		$	48,414
	Financing receivables ending balance:
	Individually evaluated for impairment	$	8,575			$	33,868			$	—			$	2,279			$	15,373			$	4,435		$	2,129		$	66,659
	Collectively evaluated for impairment	678,936				2,066,432				188,768				76,315				587,687				797,334			24,826			4,420,298
	Purchase credit impaired loans	—				21,853				—				—				9,821				380			—			32,054
	Total loans by group	$	687,511			$	2,122,153			$	188,768			$	78,594			$	612,881			$	802,149		$	26,955		$	4,519,011		-1
	-1	The amount of net deferred fees included in the ending balance was $2.8 million, $2.3 million, and $3.1 million at December 31, 2014, 2013, and 2012, respectively.
	For the purpose of estimating the allowance for loan losses, management segregates the loan portfolio into the portfolio segments detailed in the above tables.  Each of these loan categories possesses unique risk characteristics that are considered when determining the appropriate level of allowance for each segment.  Some of the risk characteristics unique to each loan category include:
	Commercial Portfolio
	•	Commercial and Industrial: Loans in this category consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital and/or capital investment.  Collateral generally consists of pledges of business assets including, but not limited to: accounts receivable, inventory, plant and equipment, or real estate, if applicable. Repayment sources consist of: primarily, operating cash flow, and secondarily, liquidation of assets.
	•	Commercial Real Estate: Loans in this category consist of mortgage loans to finance investment in real property such as multi-family residential, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties.  Loans are typically written with amortizing payment structures.  Collateral values are determined based upon third party appraisals and evaluations.  Loan to value ratios at origination are governed by established policy and regulatory guidelines. Repayment sources consist of: primarily, cash flow from operating leases and rents, and secondarily, liquidation of assets.
	•	Commercial Construction: Loans in this category consist of short-term construction loans, revolving and nonrevolving credit lines and construction/permanent loans to finance the acquisition, development and construction or rehabilitation of real property.  Project types include: residential 1-4 family condominium and multi-family homes, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties.  Loans may be written with nonamortizing or hybrid payment structures depending upon the type of project.  Collateral values are determined based upon third party appraisals and evaluations.  Loan to value ratios at origination are governed by established policy and regulatory guidelines.  Repayment sources vary depending upon the type of project and may consist of: sale or lease of units, operating cash flows or liquidation of other assets.
	•	Small Business: Loans in this category consist of revolving, term loan and mortgage obligations extended to sole proprietors and small businesses for purposes of financing working capital and/or capital investment.  Collateral generally consists of pledges of business assets including, but not limited to: accounts receivable, inventory, plant and equipment, or real estate if applicable.  Repayment sources consist of: primarily, operating cash flows, and secondarily, liquidation of assets.
For the commercial portfolio it is the Bank’s policy to obtain personal guarantees for payment from individuals holding material ownership interests of the borrowing entities.
Consumer Portfolio
•	Residential Real Estate: Residential mortgage loans held in the Bank’s portfolio are made to borrowers who demonstrate the ability to make scheduled payments with full consideration to underwriting factors such as current and expected income, employment status, current assets, other financial resources, credit history and the value of the collateral.  Collateral consists of mortgage liens on 1-4 family residential properties.  The Company does not originate or purchase sub-prime loans.
•	Home Equity: Home equity loans and lines are made to qualified individuals and are secured by senior or junior mortgage liens on owner-occupied 1-4 family homes, condominiums or vacation homes or on nonowner occupied 1-4 family homes with more restrictive loan to value requirements. The home equity loan has a fixed rate and is billed in equal payments comprised of principal and interest. The home equity line of credit has a variable rate and is billed in interest-only payments during the draw period. At the end of the draw period, the home equity line of credit is billed as a percentage of the principal balance plus all accrued interest. Additionally, the Bank has the option of renewing the line of credit for additional draw periods.  Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan to value ratios within established policy guidelines.
•	Other Consumer: Other consumer loan products include personal lines of credit and amortizing loans made to qualified individuals for various purposes such as education, auto loans, debt consolidation, personal expenses or overdraft protection.  Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines.  These loans may be secured or unsecured.
Credit Quality
The Company continually monitors the asset quality of the loan portfolio using all available information. Based on this information, loans demonstrating certain payment issues or other weaknesses may be categorized as delinquent, impaired, nonperforming and/or put on nonaccrual status. Additionally, in the course of resolving such loans, the Company may choose to restructure the contractual terms of certain loans to match the borrower’s ability to repay the loan based on their current financial condition. If a restructured loan meets certain criteria, it may be categorized as a troubled debt restructuring (“TDR”).
The Company reviews numerous credit quality indicators when assessing the risk in its loan portfolio. For the commercial portfolio, the Company utilizes a 10-point commercial risk-rating system, which assigns a risk-grade to each borrower based on a number of quantitative and qualitative factors associated with a commercial loan transaction. Factors considered include industry and market conditions, position within the industry, earnings trends, operating cash flow, asset/liability values, debt capacity, guarantor strength, management and controls, financial reporting, collateral, and other considerations. The risk-ratings categories are defined as follows:
•	1- 6 Rating — Pass: Risk-rating grades “1” through “6” comprise those loans ranging from ‘Substantially Risk Free’ which indicates borrowers are of unquestioned credit standing and the pinnacle of credit quality, well established companies with a very strong financial condition, and loans fully secured by cash collateral, through ‘Acceptable Risk’, which indicates borrowers may exhibit declining earnings, strained cash flow, increasing leverage and/or weakening market fundamentals that indicate above average or below average asset quality, margins and market share. Collateral coverage is protective.
•	7 Rating — Potential Weakness: Borrowers exhibit potential credit weaknesses or downward trends deserving management’s close attention. If not checked or corrected, these trends will weaken the Bank’s asset and position. While potentially weak, currently these borrowers are marginally acceptable; no loss of principal or interest is envisioned.
•	8 Rating — Definite Weakness, Loss Unlikely: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt. Loan may be inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. Normal repayment from the borrower is in jeopardy, although no loss of principal is envisioned. However, there is a distinct possibility that a partial loss of interest and/or principal will occur if the deficiencies are not corrected. Collateral coverage may be inadequate to cover the principal obligation.
•	9 Rating — Partial Loss Probable: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt with the added provision that the weaknesses make collection of the debt in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Serious problems exist to the point where partial loss of principal is likely.
•	10 Rating — Definite Loss: Borrowers deemed incapable of repayment. Loans to such borrowers are considered uncollectible and of such little value that continuation as active assets of the Bank is not warranted.
The credit quality of the commercial loan portfolio is actively monitored and any changes in credit quality are reflected in risk-rating changes. Risk-ratings are assigned or reviewed for all new loans, when advancing significant additions to existing relationships (over $50,000), at least quarterly for all actively managed loans, and any time a significant event occurs, including at renewal of the loan.
The Company utilizes a comprehensive strategy for monitoring commercial credit quality. Borrowers are required to provide updated financial information at least annually which is carefully evaluated for any changes in financial condition. Larger loan relationships are subject to a full annual credit review by an experienced credit analysis group. Additionally, the Company retains an independent loan review firm to evaluate the credit quality of the commercial loan portfolio. The independent loan review process achieves a significant review of the commercial loan portfolio exposure and reports the results of these reviews to the Audit Committee of the Board of Directors on a quarterly basis.
The following table details the internal risk-rating categories for the Company’s commercial portfolio:
			31-Dec-14
Category	Risk		Commercial and				Commercial Real				Commercial				Small Business				Total
	Rating		Industrial				Estate				Construction
			(Dollars in thousands)
Pass	1 - 6		$	801,578			$	2,196,109			$	248,696			$	81,255			$	3,327,638
Potential weakness	7		37,802				82,372				15,464				2,932				138,570
Definite weakness	8		20,241				67,571				1,834				949				90,595
Partial loss probable	9		1,218				1,271				—				111				2,600
Definite loss	10		—				—				—				—				—
Total			$	860,839			$	2,347,323			$	265,994			$	85,247			$	3,559,403
			31-Dec-13
Category	Risk		Commercial and				Commercial Real				Commercial				Small Business				Total
	Rating		Industrial				Estate				Construction
			(Dollars in thousands)
Pass	1 - 6		$	736,996			$	2,068,995			$	210,372			$	71,514			$	3,087,877
Potential weakness	7		21,841				91,984				8,608				3,031				125,464
Definite weakness	8		24,409				85,767				4,779				2,552				117,507
Partial loss probable	9		956				2,514				100				143				3,713
Definite loss	10		—				—				—				—				—
Total			$	784,202			$	2,249,260			$	223,859			$	77,240			$	3,334,561
For the Company’s consumer portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. However, the Company does supplement performance data with current Fair Isaac Corporation (“FICO”) and Loan to Value (“LTV”) estimates. Current FICO data is purchased and appended to all consumer loans on a quarterly basis. In addition, automated valuation services and broker opinions of value are used to supplement original value data for the residential and home equity portfolios, periodically. The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below:
	31-Dec
	2014			2013
Residential portfolio
FICO score (re-scored)(1)	739			738
LTV (re-valued)(2)	67.1	%		67	%
Home equity portfolio
FICO score (re-scored)(1)	764			763
LTV (re-valued)(2)	53.6	%		53	%
-1	The average FICO scores above are based upon rescores available from November and origination score data for loans booked between December 1 and December 31, for the years indicated.
-2	The combined LTV ratios for December 31, 2014 and 2013 are based upon updated automated valuations as of February 28, 2013 and actual score data for loans booked from March 1, 2013 through December 31, 2014. For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.
The Bank’s philosophy toward managing its loan portfolios is predicated upon careful monitoring, which stresses early detection and response to delinquent and default situations. Delinquent loans are managed by a team of seasoned collection specialists and the Bank seeks to make arrangements to resolve any delinquent or default situation over the shortest possible time frame.  As a general rule, loans more than 90 days past due with respect to principal or interest are classified as nonaccrual loans. As permitted by banking regulations, certain consumer loans past due 90 days or more may continue to accrue interest. The Company also may use discretion regarding other loans over 90 days delinquent if the loan is well secured and in process of collection. Set forth is information regarding the Company’s nonperforming loans at the period shown:
The following table shows nonaccrual loans at the dates indicated:
	31-Dec
	2014				2013
	(Dollars in thousands)
Commercial and industrial	$	2,822			$	4,178
Commercial real estate	7,279				11,734
Commercial construction	311				100
Small business	246				633
Residential real estate	8,697				10,329
Home equity	8,038				7,068
Other consumer	—				92
Total nonaccrual loans(1)	$	27,393			$	34,134
-1	Included in these amounts were $5.2 million and $7.5 million nonaccruing TDRs at December 31, 2014 and 2013, respectively.
The following table shows the age analysis of past due financing receivables as of the dates indicated:
	31-Dec-14
	30-59 days							60-89 days							90 days or more							Total Past Due					Current				Total		Recorded
																															Financing		Investment
																															Receivables		>90 Days
	Number			Principal				Number			Principal				Number			Principal				Number		Principal									and Accruing
	of Loans			Balance				of Loans			Balance				of Loans			Balance				of Loans		Balance
	(Dollars in thousands)
Commercial and industrial	18			$	3,192			10			$	1,007			19			$	2,320			47		$	6,519		$	854,320			$	860,839	$	—
Commercial real estate	19			13,428				6			1,480				16			4,225				41		19,133			2,328,190				2,347,323		—
Commercial construction	1			506				—			—				1			311				2		817			265,177				265,994		—
Small business	7			21				8			113				7			173				22		307			84,940				85,247		—
Residential real estate	13			1,670				10			1,798				36			4,826				59		8,294			521,965				530,259		106
Home equity	20			1,559				7			307				23			2,402				50		4,268			859,595				863,863		—
Other consumer	34			233				6			20				8			13				48		266			16,942				17,208		13
Total	112			$	20,609			47			$	4,725			110			$	14,270			269		$	39,604		$	4,931,129			$	4,970,733	$	119
	31-Dec-13
	30-59 days							60-89 days							90 days or more							Total Past Due					Current				Total		Recorded
																															Financing		Investment
																															Receivables		>90 Days
	Number			Principal				Number			Principal				Number			Principal				Number		Principal									and Accruing
	of Loans			Balance				of Loans			Balance				of Loans			Balance				of Loans		Balance
	(Dollars in thousands)
Commercial and industrial	9			$	743			6			$	327			20			$	3,763			35		$	4,833		$	779,369			$	784,202	$	—
Commercial real estate	21			8,643				2			356				30			8,155				53		17,154			2,232,106				2,249,260		—
Commercial construction	1			847				—			—				1			100				2		947			222,912				223,859		—
Small business	18			353				6			227				14			247				38		827			76,413				77,240		—
Residential real estate	23			2,903				8			1,630				39			6,648				70		11,181			530,262				541,443		462
Home equity	27			1,922				8			852				23			2,055				58		4,829			817,312				822,141		—
Other consumer	110			514				30			106				34			148				174		768			19,394				20,162		63
Total	209			$	15,925			60			$	3,498			161			$	21,116			430		$	40,539		$	4,677,768			$	4,718,307	$	525
In the course of resolving nonperforming loans, the Bank may choose to restructure the contractual terms of certain loans. The Bank attempts to work out an alternative payment schedule with the borrower in order to avoid foreclosure actions. Any loans that are modified are reviewed by the Bank to identify if a TDR has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms, or a combination of the two.
The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated:
	31-Dec
	2014				2013
	(Dollars in thousands)
TDRs on accrual status	$	38,382			$	38,410
TDRs on nonaccrual status	5,248				7,454
Total TDRs	$	43,630			$	45,864
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	$	2,004			$	2,474
Additional commitments to lend to a borrower who has been a party to a TDR:	$	1,400			$	1,877
The Bank’s policy is to have any restructured loan which is on nonaccrual status prior to being modified remain on nonaccrual status for six months, subsequent to being modified, before management considers its return to accrual status. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. Additionally, loans classified as TDRs are adjusted to reflect the changes in value of the recorded investment in the loan, if any, resulting from the granting of a concession. For all residential loan modifications, the borrower must perform during a 90 day trial period before the modification is finalized.
The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring:
	Years Ended December 31
	2014
	Number			Pre-Modification				Post-Modification
	of Contracts			Outstanding Recorded				Outstanding Recorded
				Investment				Investment(1)
	(Dollars in thousands)
Commercial & industrial	12			$	681			$	681
Commercial real estate	13			4,329				4,329
Small business	5			133				133
Residential real estate	9			1,535				1,568
Home equity	11			923				926
Other consumer	1			8				8
Total	51			$	7,609			$	7,645
	2013
Commercial & industrial	11			$	732			$	732
Commercial real estate	9			8,100				8,100
Small business	12			556				556
Residential real estate	9			2,401				2,427
Home equity	17			1,347				1,347
Other consumer	9			27				27
Total	67			$	13,163			$	13,189
	2012
Commercial & industrial	18			$	3,372			$	3,372
Commercial real estate	15			7,121				7,121
Small business	14			621				621
Residential real estate	20			3,495				3,499
Home equity	20			1,195				1,198
Other consumer	33			328				329
Total	120			$	16,132			$	16,140
-1	The post-modification balances represent the balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.
The following table shows the Company’s post-modification balance of TDRs listed by type of modification as of the periods indicated:
	Years Ended December 31
	2014				2013				2012
	(Dollars in thousands)
Extended maturity	$	3,441			$	3,582			$	5,867
Adjusted interest rate	727				—				2,182
Combination rate & maturity	2,640				8,917				5,007
Court ordered concession	837				690				3,084
Total	$	7,645			$	13,189			$	16,140
For purposes of this table the Company considers a loan to have defaulted when it reaches 90 days past due. The following table shows the loans that have been modified during the past twelve months which have subsequently defaulted during the periods indicated:
	Years Ended December 31
	2014							2013							2012
	Number			Recorded				Number			Recorded				Number			Recorded
	of Contracts			Investment				of Contracts			Investment				of Contracts			Investment
	(Dollars in thousands)
Troubled debt restructurings that subsequently defaulted
Commercial & industrial	2			$	196			—			$	—			1			$	231
Commercial real estate	—			—				1			176				3			696
Residential real estate	3			214				—			—				1			238
Other consumer	—			—				1			1				—			—
Total	5			$	410			2			$	177			5			$	1,165
All TDR loans are considered impaired and therefore are subject to a specific review for impairment. The impairment analysis appropriately discounts the present value of the anticipated cash flows by the loan’s contractual rate of interest in effect prior to the loan’s modification. The amount of impairment, if any, is recorded as a specific loss allocation to each individual loan in the allowance for loan losses. Commercial loans (commercial and industrial, commercial construction, commercial real estate and small business loans), residential loans, and home equity loans that have been classified as TDRs and which subsequently default are reviewed to determine if the loan should be deemed collateral dependent. In such an instance, any shortfall between the value of the collateral and the carrying value of the loan is determined by measuring the recorded investment in the loan against the fair value of the collateral less estimated costs to sell. The Bank charges off the amount of any confirmed loan loss in the period when the loans, or portion of loans, are deemed uncollectible. Smaller balance consumer TDR loans are reviewed for performance to determine when a charge-off is appropriate.
A loan is considered impaired when, based on current information and events, it is probable that 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 borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed.
The table below sets forth information regarding the Company’s impaired loans as of the dates indicated:
	Years Ended December 31
	2014
	Recorded				Unpaid				Related				Average				Interest Income Recognized
	Investment				Principal				Allowance				Recorded
					Balance								Investment
	(Dollars in thousands)
With no related allowance recorded
Commercial & industrial	$	3,005			$	3,278			$	—			$	4,557			$	258
Commercial real estate	15,982				17,164				—				16,703				1,025
Commercial construction	311				311				—				311				13
Small business	692				718				—				772				45
Residential real estate	2,439				2,502				—				2,493				102
Home equity	4,169				4,221				—				4,264				198
Other consumer	338				341				—				364				24
Subtotal	26,936				28,535				—				29,464				1,665
With an allowance recorded
Commercial & industrial	$	1,649			$	1,859			$	412			$	2,032			$	98
Commercial real estate	14,747				15,514				197				15,650				842
Commercial construction	—				—				—				—				—
Small business	396				458				7				456				32
Residential real estate	12,616				13,727				1,500				12,817				537
Home equity	1,161				1,264				262				1,203				46
Other consumer	530				530				38				580				22
Subtotal	31,099				33,352				2,416				32,738				1,577
Total	$	58,035			$	61,887			$	2,416			$	62,202			$	3,242
	2013
	Recorded				Unpaid				Related				Average				Interest
	Investment				Principal				Allowance				Recorded				Income
					Balance								Investment				Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial & industrial	$	7,147			$	7,288			$	—			$	7,338			$	338
Commercial real estate	14,283				15,891				—				15,728				1,075
Commercial construction	100				408				—				1,105				43
Small business	1,474				1,805				—				1,854				121
Residential real estate	1,972				2,026				—				2,021				95
Home equity	4,263				4,322				—				4,335				202
Other consumer	446				446				—				515				41
Subtotal	29,685				32,186				—				32,896				1,915
With an allowance recorded
Commercial & industrial	$	2,001			$	2,045			$	1,150			$	2,572			$	125
Commercial real estate	25,233				25,377				765				25,595				1,326
Commercial construction	—				—				—				—				—
Small business	429				462				109				459				28
Residential real estate	13,228				14,197				1,564				13,405				515
Home equity	627				694				116				642				26
Other consumer	852				856				70				954				33
Subtotal	42,370				43,631				3,774				43,627				2,053
Total	$	72,055			$	75,817			$	3,774			$	76,523			$	3,968
	2012
	Recorded				Unpaid				Related				Average				Interest
	Investment				Principal				Allowance				Recorded				Income
					Balance								Investment				Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial & industrial	$	5,849			$	7,343			$	—			$	6,993			$	391
Commercial real estate	12,999				13,698				—				13,984				952
Commercial construction	—				—				—				—				—
Small business	1,085				1,147				—				1,217				80
Residential real estate	2,545				2,630				—				2,589				118
Home equity	4,119				4,166				—				4,190				195
Other consumer	700				705				—				858				72
Subtotal	27,297				29,689				—				29,831				1,808
With an allowance recorded
Commercial & industrial	$	2,726			$	2,851			$	1,084			$	2,883			$	143
Commercial real estate	20,869				21,438				516				21,678				1,340
Commercial construction	—				—				—				—				—
Small business	1,194				1,228				353				1,255				77
Residential real estate	12,828				13,601				1,302				13,014				560
Home equity	316				389				35				324				23
Other consumer	1,429				1,453				130				1,610				60
Subtotal	39,362				40,960				3,420				40,764				2,203
Total	$	66,659			$	70,649			$	3,420			$	70,595			$	4,011
Certain loans acquired by the Company may have shown evidence of deterioration of credit quality since origination and it was therefore deemed unlikely that the Bank would be able to collect all contractually required payments. As such, these loans were deemed to be Purchase Credit Impaired (“PCI”) loans and the carrying value and prospective income recognition are predicated upon future cash flows expected to be collected. The following tables display certain information pertaining to purchased credit impaired loans at the dates indicated:
		Mayflower Acquisition			Central Acquisition
		15-Nov-13			November 9, 2012
		(Dollars in thousands)
Contractually required principal and interest payments receivable	-1	$	4,440		$	47,548
Less: expected cash flows	-1	3,144			38,815
Initial nonaccretable difference		$	1,296		$	8,733
Expected cash flows	-1	$	3,144		$	38,815
Less: fair value (initial carrying amount)		2,758			35,720
Accretable Yield		$	386		$	3,095
(1) Reflective of anticipated prepayments.
		31-Dec
		2014			2013
		(Dollars in thousands)
Outstanding balance		$	25,279		$	33,555
Carrying amount		$	22,315		$	29,544
The following table summarizes activity in the accretable yield for the PCI loan portfolio:
		2014				2013
		(Dollars in thousands)
Beginning balance		$	2,514			$	2,464
Acquisition		—				386
Accretion		(2,299		)		(1,812		)
Other change in expected cash flows (1)		2,565				1,142
Reclassification from nonaccretable difference for loans which have paid off (2)		194				334
Ending balance		$	2,974			$	2,514
-1	Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).
-2	Results in increased income during the period when a loan pays off at amount greater than originally expected.
Loans to Insiders
The Bank has granted loans to principal officers, directors (and their affiliates) and principal security holders. All such loans were made in the ordinary course of business on substantially the same terms, including interest rate and collateral, as those prevailing at the time for comparable transactions with other persons, and do not involve more than the normal risk of collectability or present other unfavorable features. Annual activity consists of the following at the periods indicated:
	2014				2013
	(Dollars in thousands)
Principal balance of loans outstanding at beginning of year	$	52,510			$	47,859
Loan advances	21,310				107,461
Loan payments/payoffs	(21,913		)		(102,810		)
Reduction for former directors (1)	(25,913		)		—
Principal balance of loans outstanding at end of year	$	25,994			$	52,510
(1) Amounts relate to loans to individuals who are no longer current directors of the Company and therefore are not deemed to be an insider.

BANK_PREMISES_AND_EQUIPMENT

BANK PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
BANK PREMISES AND EQUIPMENT	BANK PREMISES AND EQUIPMENT
	Bank premises and equipment at December 31, were as follows:
		2014			2013			Estimated
								Useful Life
		(Dollars in thousands)						(In years)
	Cost:
	Land	$	15,786		$	16,026		n/a
	Bank premises	33,425			32,858			May-39
	Leasehold improvements	20,797			20,189			15-Jan
	Furniture and equipment	49,894			46,613			10-Jan
	Total cost	119,902			115,686
	Accumulated depreciation	(55,828		)	(50,736		)
	Net bank premises and equipment	$	64,074		$	64,950
	Depreciation expense related to bank premises and equipment was $6.6 million in 2014, $6.1 million in 2013, and $5.5 million in 2012, which is included in occupancy and equipment expense and other noninterest expense. In addition. the Company has recognized impairment of $670,000 and $93,000 during 2014 and 2013, respectively, relating to certain bank premises.

GOODWILL_AND_IDENTIFIABLE_INTA

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
	The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:
		2014		2013
		(Dollars in thousands)
	Balances not subject to amortization:
	Goodwill	$	170,421	$	170,421
	Balances subject to amortization:
	Core deposit intangibles	9,269		11,218
	Other identifiable intangible assets	616		1,003
	Total other intangible assets	9,885		12,221
	Total goodwill and other intangible assets	$	180,306	$	182,642
	The changes in the carrying value of goodwill for the periods indicated were as follows:
		2014		2013			2012
		(Dollars in thousands)
	Balance at beginning of year	$	170,421	$	150,391		$	130,074
	Acquisitions	—		20,030			22,544
	Impairment (1)	—		—			(2,227		)
	Balance at end of year	$	170,421	$	170,421		$	150,391
	-1	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.
	The gross carrying amount and accumulated amortization of other intangible assets were as follows at the periods indicated:
		2014								2013
		Gross		Accumulated			Net			Gross		Accumulated			Net
		Carrying		Amortization			Carrying			Carrying		Amortization			Carrying
		Amount					Amount			Amount					Amount
		(Dollars in thousands)
	Core deposit intangibles	$	20,147	$	(10,878	)	$	9,269		$	20,147	$	(8,929	)	$	11,218
	Other intangible assets	1,940		(1,324		)	616			1,940		(937		)	1,003
	Total	$	22,087	$	(12,202	)	$	9,885		$	22,087	$	(9,866	)	$	12,221
	Amortization of intangible assets was $2.3 million, $2.1 million, and $1.7 million, for 2014, 2013, and 2012, respectively.
	The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:
	Year	Amount
		(Dollars in thousands)
	2015	$	2,175
	2016	2,082
	2017	2,061
	2018	1,315
	2019	704
	The original weighted average amortization period for intangible assets is 9.9 years.

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
DEPOSITS	DEPOSITS
	The following is a summary of the scheduled maturities of time deposits as of December 31:
		2014				2013
		(Dollars in thousands)
	1 year or less	$	462,506	71.2	%	$	559,402	75.1	%
	Over 1 year to 2 years	102,385		15.8	%	87,645		11.8	%
	Over 2 years to 3 years	29,044		4.5	%	51,778		7	%
	Over 3 years to 4 years	26,156		4	%	20,462		2.8	%
	Over 4 years to 5 years	29,529		4.5	%	24,288		3.3	%
	Over 5 years	—		—	%	53		—	%
	Total	$	649,620	100	%	$	743,628	100	%
	The amounts of overdraft deposits that were reclassified to the loan category at December 31, 2014 and 2013 were $3.5 million and $2.4 million, respectively.
	The Bank's deposit accounts are insured to the maximum extent permitted by law by the Deposit Insurance Fund which is administered by the FDIC. The FDIC offers insurance coverage on deposits up to the federally insured limit of $250,000.

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS
	Federal Home Loan Bank Borrowings
	Advances payable to the Federal Home Loan Bank are summarized as follows:
			2014					2013
						Weighted					Weighted
						Average					Average
			Total			Contractual		Total			Contractual
			Outstanding			Rate		Outstanding			Rate
			(Dollars in thousands)
	Stated Maturity
	2014		$	—		—	%	$	105,027		0.55	%
	2015		38,001			0.69	%	3,074			5.81	%
	2016		—			—	%	—			—	%
	2017		31,203			4.03	%	31,290			4.02	%
	2018		—			—	%	—			—	%
	2019		—			—	%	—			—	%
	Subtotal		$	69,204		2.2	%	$	139,391		1.44	%
	Amortizing advances		876					903
	Total Federal Home Loan Bank Advances		$	70,080				$	140,294
	To manage the interest rate risk of these advances, the Company has entered into interest rate swaps, effectively converting $25.0 million and $100.0 million of the FHLB advances to fixed interest rates at December 31, 2014 and 2013, respectively. These swaps carried a weighted average interest rate of 2.94% and 2.68% at December 31, 2014 and 2013, respectively, and have various maturity dates ranging through December 2018. In June 2014, the Company terminated $75.0 million in swaps that matured in 2014 and 2015 resulting in a loss on termination of approximately $1.1 million, which is included in other noninterest expense for 2014. The final $25.0 million in swapped FHLB advances will mature in 2018.
	During 2013 the Company prepaid $60.0 million of these advances assumed as part of the Central acquisition. The difference between the exit price and the net carrying amount of the debt resulted in a gain on extinguishment of debt of $763,000.
	The Company’s FHLB advances are collateralized by a blanket pledge agreement on the Bank’s FHLB stock, certain qualified investment securities, deposits at the Federal Home Loan Bank, and by residential mortgages, and certain commercial real estate loans held in the Bank’s portfolio. The Bank’s unused remaining available borrowing capacity at the Federal Home Loan Bank was approximately $755.7 million and $668.1 million at December 31, 2014 and 2013, respectively, inclusive of a $5.0 million line of credit. At December 31, 2014 and 2013, the Company was in compliance with the FHLB collateral requirements.
	Short-Term Debt
	The following table summarizes short-term borrowings:
	The Company’s short-term borrowings consisted of the following as of the periods indicated:
		31-Dec
		2014			2013
		(Dollars in thousands)
	Customer repurchase agreements	$	147,890		$	149,288
	Line of credit advances	—			5,000
	Total short-term borrowings	$	147,890		$	154,288
	The interest expense on short-term borrowings was $200,000, $276,000, and $363,000 as of December 31, 2014, 2013, and 2012, respectively.
	Customer Repurchase Agreements. In a security repurchase agreement with the Bank’s customers, the Bank will generally sell a security, agreeing to repurchase either the same or substantially the same security on a specified later date, at a price greater than the original sales price. The securities underlying these agreements with customers are held in segregated safekeeping accounts by the Bank’s safekeeping agents, to minimize the potential risk that the borrower may not return the security underlying the agreements. The Customer repurchase agreements are primarily collateralized by U.S. Government agency mortgage-backed securities. The amount of investments pledged against customer repurchase agreements was $156.9 million and $169.0 million at December 31, 2014 and 2013, respectively.
	Line of Credit Borrowings. The revolving line of credit, which is an obligation of the parent company, accrues interest at an adjusted LIBOR rate. The line of credit provides for borrowings of up to $20.0 million (increased from $10.0 million with a 2014 amendment) and matures on November 18, 2015.
	The table below sets forth additional information on certain short-term borrowing categories as of and for the periods indicated:
			2014					2013						2012
						Weighted					Weighted							Weighted
						Average					Average							Average
						Interest					Interest							Interest
			Amount			Rate		Amount			Rate			Amount				Rate
	Customer Repurchase Agreements		(Dollars in thousands)
	Balance outstanding at end of year		$	147,890		0.13	%	$	149,288		0.13	%		$	153,359			0.13	%
	Average daily balance outstanding		143,700			0.13	%	147,195			0.13	%		160,589				0.2	%
	Maximum balance outstanding at any month end		160,317			N/A		164,180			N/A			178,171				N/A
	Long-Term Debt
	The following table summarizes long-term debt as of the periods indicated:
		31-Dec
		2014			2013
		(Dollars in thousands)
	Wholesale repurchase agreements	$	50,000		$	50,000
	Junior subordinated debentures
	Capital Trust V	51,547			51,547
	Slades Ferry Trust I	10,310			10,310
	Central Trust I	5,258			5,258
	Central Trust II	6,570			6,791
	Subordinated debentures	65,000			30,000
	Total long-term debt	$	188,685		$	153,906
	The interest expense on long-term debt was $6.4 million, $7.0 million, and $7.1 million as of December 31, 2014, 2013, and 2012, respectively.
	Wholesale Repurchase Agreements: In a wholesale security repurchase agreement with established firms, the Bank will generally sell a security, agreeing to repurchase either the same or substantially the same security on a specified later date, at a price greater than the original sales price. The securities underlying these agreements with these counterparties are primarily collateralized by U.S. Government agency mortgage-backed securities, which are delivered to broker/dealers. The amount of investments pledged against wholesale repurchase agreements was $52.9 million and $50.1 million at December 31, 2014 and 2013, respectively. At both December 31, 2014 and 2013, there was one outstanding wholesale repurchase agreement with a maturity date of August 23, 2015.
	Junior Subordinated Debentures: The junior subordinated debentures are issued to various trust subsidiaries of the Company. These trusts are considered to be variable interest entities for which the Company is not the primary beneficiary, and therefore the accounts of the trusts are not included in the Company’s consolidated financial statements. These trusts were formed for the purpose of issuing trust preferred securities, which were then sold in a private placement offering. The proceeds from the sale of the securities and the issuance of common stock by these trusts were invested in these Junior Subordinated Debentures issued by the Company.
	For regulatory purposes, bank holding companies are allowed to include trust preferred securities in Tier 1 capital up to a certain limit. Provisions in the Dodd-Frank Act generally exclude trust preferred securities from Tier 1 capital, however, holding companies with consolidated assets of less than $15 billion, such as the Company, will be able to continue to include these instruments in Tier 1 capital, but no such securities issued in the future will count as Tier 1 capital.
	Information relating to these trust preferred securities are as follows:
	Trust		Description of Capital Securities
	Capital Trust V		$50.0 million due in 2037, interest at a variable rate (LIBOR plus 1.48%), which has been effectively converted to a fixed rate of 6.52% until December 28, 2016, through the use of an interest rate swap. These securities are callable quarterly, until maturity.
Slades Ferry Trust I		$10.0 million due in 2034, bearing interest at a variable rate (LIBOR plus 2.79%). These securities are callable quarterly, until maturity.
Central Trust I		$5.1 million due in 2034, bearing interest at a variable rate (LIBOR plus 2.44%). These securities are callable quarterly, until maturity.
Central Trust II		$5.9 million due in 2037, bearing a fixed interest rate 7.015% until March 15, 2017. Subsequent to this date, the interest will be variable (LIBOR plus 1.65%) and the securities will become callable quarterly, until maturity.
All obligations under these trust preferred securities are unconditionally guaranteed by the Company.
Subordinated Debentures: At December 31, 2014, there is an outstanding subordinated debenture at the Bank. The subordinated debentures were issued to USB Capital Resources, Inc., a wholly-owned subsidiary of U.S. Bank National Association. The subordinated debt matures on October 1, 2019, however with regulatory approval, the Bank may redeem the subordinated debt without penalty at any time on or after October 1, 2014. The interest rate was fixed at 7.02% through August of 2013, and is now a floating rate of LIBOR plus 3.00%.
At December 31, 2014, there was also an outstanding subordinated debenture at the bank holding company. The subordinated debentures were issued to several investors via private placement on November 17, 2014. The subordinated debt matures on November 15, 2024, however with regulatory approval, the Bank may redeem the subordinated debt without penalty at any scheduled payment date on or after November 15, 2019 with 30 days notice. The interest rate is fixed at 4.75% through November 15, 2019, after which it converts to LIBOR plus 2.98%.
The following table sets forth the contractual maturities of long-term debt over the next five years:
		2015			2016			2017			2018				2019				Thereafter		Total
		(Dollars in thousands)
Wholesale repurchase agreements		$	50,000		$	—		$	—		$	—			$	—			$	—	$	50,000
Junior subordinated debentures
Capital trust V		—			—			—			—				—				51,547		51,547
Slades ferry trust I		—			—			—			—				—				10,310		10,310
Central trust I		—			—			—			—				—				5,258		5,258
Central trust II		—			—			—			—				—				6,570		6,570
Subordinated debentures		—			—			—			—				30,000				35,000		65,000

EARNINGS_PER_SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE
	Earnings per share consisted of the following components for the years ended December 31:
		2014				2013			2012
		(Dollars in thousands)
	Net income	$	59,845			$	50,254		$	42,627
		Weighted Average Shares
	Basic shares	23,899,562				23,011,814			21,782,499
	Effect of dilutive securities	93,815				76,764			29,817
	Diluted shares	23,993,377				23,088,578			21,812,316
	Net income per share
	Basic EPS	$	2.5			$	2.18		$	1.96
	Effect of dilutive securities	(0.01		)		—			(0.01		)
	Diluted EPS	$	2.49			$	2.18		$	1.95
	The following table illustrates the options to purchase common stock and the shares of performance-based restricted stock that were excluded from the calculation of diluted earnings per share because they were anti-dilutive:
		31-Dec
		2014			2013			2012
	Stock options	—			124,608			584,938
	Performance-based restricted stock	—			—			—

STOCK_BASED_COMPENSATION

STOCK BASED COMPENSATION	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK BASED COMPENSATION	STOCK BASED COMPENSATION
	The Company has the following stock based plans, all of which have been approved by the Company’s Board of Directors and shareholders:
	•	1996 Nonemployee Directors’ Stock Option Plan (“1996 Plan”)
	•	1997 Employee Stock Option Plan (“1997 Plan”)
	•	Second Amended and Restated 2005 Employee Stock Plan (“2005 Plan”)
	•	2006 Nonemployee Director Stock Plan (“2006 Plan”)
	•	2010 Nonemployee Director Stock Plan (“2010 Plan”)
	The following table presents the amount of cumulatively granted stock options and restricted stock awards, net of forfeitures, through December 31, 2014:
			Authorized			Authorized		Total		Cumulative Granted, Net of					Total		Authorized
			Stock			Restricted				Forfeitures							but
			Option Awards			Stock Awards				Stock			Restricted				Unissued
										Option  Awards			Stock  Awards
		1996 Plan	300,000			N/A		300,000		190,000			N/A		190,000		-4
		1997 Plan	1,100,000			N/A		1,100,000		972,271			N/A		972,271		-4
		2005 Plan	-1			-1		1,650,000		537,941			551,043		1,088,984		561,016
		2006 Plan	-2			-2		35,400		15,000			20,400		35,400		-4
		2010 Plan	-3			-3		314,600		27,000			67,220		94,220		220,380
	-1	The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
	-2	The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
	-3	The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.
	-4	There are no shares available for grant under the 1996 Plan or 1997 Plan due to their expirations. These Plans have outstanding stock options exercisable despite the Plan expiration. Additionally, the 2006 Plan has outstanding stock options exercisable despite the transfer of remaining authorized shares to the 2010 Plan.
	The Company issues shares for stock option exercises and restricted stock awards from its pool of authorized but unissued shares.
	The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the years presented:
		Years Ended December 31
		2014				2013			2012
		(Dollars in thousands)
	Stock based compensation expense
	Stock options	$	36			$	241		$	526
	Restricted stock awards(1)	2,135				1,906			1,968
	Directors’ fee expense
	Stock options	14				27			19
	Restricted stock awards	527				288			332
	Total stock based award expense	$	2,712			$	2,462		$	2,845
	Related tax benefits recognized in earnings	$	945			$	832		$	932
	-1	Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.
	Expense related to awards issued to directors are recognized as directors’ fees within other noninterest expense.
	The Company has standard form agreements used for stock option and restricted stock awards. The standard form agreements used for the Chief Executive Officer and all other Executive Officers have previously been disclosed in Securities and Exchange Commission filings and generally provide that: (1) any unvested options or unvested restricted stock vest upon a Change of Control; and, that (2) any stock options which vest pursuant to a Change of Control, which is an event described in Section 280G of the Internal Revenue Code of 1986, will be cashed out at the difference between the acquisition price and the exercise price of the stock option.
	Stock Options
	The fair value of each option grant is estimated on the date of the grant using the Black-Scholes option-pricing model with the following assumptions used for grants under the identified plans:
	•	Expected volatility is based on the standard deviation of the historical volatility of the weekly adjusted closing price of the Company’s shares for a period equivalent to the expected life of the option.
	•	Expected life represents the period of time that the option is expected to be outstanding, taking into account the contractual term, historical exercise/forfeiture behavior, and the vesting period, if any.
	•	Expected dividend yield is an annualized rate calculated using the most recent dividend payment at time of grant and the Company’s average trailing twelve-month daily closing stock price.
	•	The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for a period equivalent to the expected life of the option.
	•	The stock based compensation expense recognized in earnings should be based on the amount of awards ultimately expected to vest, therefore a forfeiture assumption is estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock based compensation expense recognized in 2014, 2013, and 2012 has been reduced for annualized estimated forfeitures of 3.5% based on historical experience.
	The Company made the following awards of nonqualified options to purchase shares of common stock in 2013. There were no such awards made in 2014 or 2012.
		Year Ended December 31
		2013
	Date of grant	11/9/13
	Plan	2010
	Options granted	5,000
	Vesting period (1)	13 months
	Expiration date	11/9/23
	Expected volatility	31.23		%
	Expected life (years)	5.5
	Expected dividend yield	2.64		%
	Risk free interest rate	1.56		%
	Fair value per option	$	8.13
	-1	Vesting periods begin on the grant date unless otherwise noted.
	Under all of the Company’s stock based plans, the option exercise price is based upon the average of the high and low trading value of the stock on the date of grant. Stock option awards granted to date under all plans expire through 2023.
	The following table presents relevant information relating to the Company’s stock options for the periods indicated:
		Years Ended December 31
		2014				2013			2012
		(Dollars in thousands)
	Fair value of stock options vested based on grant date fair value	$	211			$	430		$	706
Intrinsic value of stock options exercised	1,210				1,051			609
Cash received from stock option exercises	6,285				2,475			1,242
Tax benefit realized on stock option exercises/repurchase	442				322			242
Weighted average grant date fair value of options granted (per share)	—				8.13			—
Cash paid to settle equity instruments granted under stock based compensation arrangements	—				—			134
A summary of the status of the Company’s Stock Option Grants for the year ended December 31, 2014 is presented in the table below:
	Outstanding												Nonvested
	Stock Option				Weighted			Weighted		Aggregate			Stock			Weighted
	Awards				Average			Average		Intrinsic			Option			Average
					Exercise			Remaining		Value (1)			Awards			Grant Date
					Price			Contractual								Fair Value
								Term (years)
	(Dollars in thousands, except per share data)
Balance at January 1, 2014	524,948				$	30.5							33,487			$	6.71
Granted	—				—								—			—
Exercised	(193,697	)			32.45								n/a			n/a
Vested	n/a				n/a								(31,821	)		6.64
Forfeited	—				—								—			—
Expired	(500	)			31.44								—			—
Balance at December 31, 2014	330,751		-2		$	29.36		3.65		$	4,548		1,666		-4	$	8.13
Options outstanding and expected to vest at December 31, 2014	330,750		-2		$	29.36		3.65		$	4,548
Options exercisable at December 31, 2014	329,085		-3		$	29.33		3.63		$	4,535
Unrecognized compensation cost, including forfeiture estimate																		$	—
Weighted average remaining recognition period (years)																		0.01
-1	The aggregate intrinsic value in the preceding tables represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2014 of $43.11 which would have been received by the option holders had they all exercised their options as of that date.
-2	Inclusive of 28,999 stock options outstanding and expected to vest to Directors.
-3	Inclusive of 27,334 vested stock options outstanding to Directors.
-4	Inclusive of 1,666 nonvested stock options outstanding to Directors.
Restricted Stock
The Company grants both time-vested restricted stock awards as well as performance-based restricted stock awards. During the years ended December 31, 2014, 2013, and 2012 the Company has made the following restricted stock award grants:
	Shares Granted			Plan		Fair Value (1)			Vesting Period
Time-vested
2014
3/20/14	65,950			2005		$	39.82		Ratably over 5 years from grant date
3/31/14	3,000			2005		39			Ratably over 3 years from grant date
5/20/14	10,920			2010		35.08			At the end of 5 years from grant date(2)
11/20/14	2,000			2005		39.11			Ratably over 5 years from grant date
12/11/14	2,000			2005		$	40.89		Ratably over 5 years from grant date
2013
1/16/13	2,000			2005		30.48			Ratably over 3 years from grant date
2/14/13	93,800			2005		31.51			Ratably over 5 years from grant date
5/21/13	14,700			2010		33.17			At the end of 5 years from grant date(2)
2012
2/16/12	89,800			2005		$	27.81		Ratably over 5 years from grant date
4/5/12	1,000			2005		28.16			Ratably over 5 years from grant date
5/22/12	1,000			2010		27.63			Immediate upon grant
5/22/12	13,000			2010		27.63			At the end of 5 years from grant date(2)
11/10/12	1,000			2010		28.03			At the end of 5 years from grant date(2)
Performance-based
2014
3/20/14	20,700			2005		$	39.82		On March 20, 2017, if performance conditions are met
-1	The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.
-2	These restricted stock grants will vest at the end of a five year period, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement. If a non-employee director is removed from the Board for cause, the Company has ninety (90) days within which to exercise a right to repurchase any unvested portion of any restricted stock award from the non-employee director for the aggregate price of one dollar ($1.00).
The following table presents the fair value of restricted stock awards vesting during the periods presented:
	Years Ended December 31
	2014				2013			2012
	(Dollars in thousands)
Fair value of restricted stock awards upon vesting	$	3,293			$	3,289		$	2,085
A summary of the status of the Company’s Restricted Stock Award Grants for the year ended December 31, 2014 is presented in the table below:
	Outstanding Restricted Stock				Weighted Average
	Awards				Grant Price ($)
	(Dollars in thousands, except per share data)
Balance at January 1, 2014	271,927				$	28.39
Granted	104,570				39.31
Vested/released	(91,507	)			26.3
Forfeited	(8,463	)			30.21
Balance at December 31, 2014	276,527		-1		$	33.15
Unrecognized compensation cost (inclusive of directors’ fees), including forfeiture estimate								$	6,644
Weighted average remaining recognition period (years)								3.15
-1	Inclusive of 34,600 restricted stock awards outstanding to Directors.

DERIVATIVES_AND_HEDGING_ACTIVI

DERIVATIVES AND HEDGING ACTIVITIES	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITIES	DERIVATIVES AND HEDGING ACTIVITIES
	The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally to manage the Company’s interest rate risk. Additionally, the Company enters into interest rate derivatives and foreign exchange contracts to accommodate the business requirements of its customers (“customer related positions”). The Company minimizes the market and liquidity risks of customer related positions by entering into similar offsetting positions with broker-dealers. Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is dependent upon whether or not it qualifies as a hedge for accounting purposes, and further, by the type of hedging relationship.
	The Company does not enter into proprietary trading positions for any derivatives.
	Interest Rate Positions
	The Company currently utilizes interest rate swap agreements as hedging instruments against interest rate risk associated with the Company’s borrowings. An interest rate swap is an agreement whereby one party agrees to pay a floating rate of interest on a notional principal amount in exchange for receiving a fixed rate of interest on the same notional amount, for a predetermined period of time, from a second party. The amounts relating to the notional principal amount are not actually exchanged. The maximum length of time over which the Company is currently hedging its exposure to the variability in future cash flows for forecasted transactions related to the payment of variable interest on existing financial instruments is four years.
	The following table reflects the Company’s derivative positions for the periods indicated below for interest rate swaps which qualify as cash flow hedges for accounting purposes:
	31-Dec-14
	Notional				Trade		Effective		Maturity		Receive		Current			Pay Fixed			Fair Value
	Amount				Date		Date		Date		(Variable)		Rate			Swap Rate
											Index		Received
	(Dollars in thousands)
	$	25,000			16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		$	(2,093	)
	25,000				16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		(2,094		)
	25,000				9-Dec-08		10-Dec-08		10-Dec-18		3 Month LIBOR		0.24	%		2.94	%		(1,383		)
	$	75,000																	$	(5,570	)
	31-Dec-13
	Notional				Trade		Effective		Maturity		Receive		Current			Pay Fixed			Fair Value
	Amount				Date		Date		Date		(Variable)		Rate			Swap Rate
											Index		Received
	(Dollars in thousands)
	$	25,000			16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		$	(3,151	)
	25,000				16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		(3,152		)
	25,000				9-Dec-08		10-Dec-08		10-Dec-18		3 Month LIBOR		0.24	%		2.94	%		(1,493		)
	50,000				17-Nov-09		20-Dec-10		20-Dec-14		3 Month LIBOR		0.25	%		3.04	%		(1,341		)
	25,000				5-May-11		10-Jun-11		10-Jun-15		3 Month LIBOR		0.24	%		1.71	%		(493		)
	$	150,000																	$	(9,630	)
	For derivative instruments that are designated and qualify as hedging instruments in a cash flow hedge, the effective portion of the gains or losses is reported as a component of OCI, and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings.  The Company expects approximately $2.7 million (pre-tax) to be reclassified to interest expense from OCI, related to the Company’s cash flow hedges, in the next twelve months.  This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of December 31, 2014.
	The Company recognized $244,000 of net amortization income that was an offset to interest expense related to previously terminated swaps for the years ended December 31, 2014, 2013 and 2012.
	In June 2014, the Company repaid certain borrowings and consequently terminated the corresponding cash flow hedges. As a result of the termination of the cash flow hedges, the Company reclassified a pre-tax loss of approximately $1.1 million out of OCI and into other noninterest expense.
	The Company had no fair value hedges as of December 31, 2014, 2013, and 2012.
	Customer Related Positions
	Loan level derivatives, primarily interest rate swaps, offered to commercial borrowers through the Bank’s loan level derivative program do not qualify as hedges for accounting purposes. The Bank believes that its exposure to commercial customer derivatives is limited because these contracts are simultaneously matched at inception with an offsetting dealer transaction. The commercial customer derivative program allows the Bank to retain variable-rate commercial loans while allowing the customer to synthetically fix the loan rate by entering into a variable-to-fixed interest rate swap.
	Foreign exchange contracts offered to commercial borrowers through the Bank’s derivative program do not qualify as hedges for accounting purposes. The Bank acts as a seller and buyer of foreign exchange contracts to accommodate its customers. To mitigate the market and liquidity risk associated with these derivatives, the Bank enters into similar offsetting positions.
	The following table reflects the Company’s customer related derivative positions for the periods indicated below for those derivatives not designated as hedges for accounting purposes:
		Number of			Notional Amount Maturing
		Positions (1)			Less than 1 year				Less than 2 years			Less than 3 years			Less than 4 years			Thereafter			Total		Fair Value
		31-Dec-14
		(Dollars in thousands)
	Loan level derivatives
	Receive fixed, pay variable	174			$	88,147			46,854			40,958			38,108			403,208			$	617,275	$	17,840
	Pay fixed, receive variable	168			$	88,147			46,854			40,958			38,108			403,208			$	617,275	$	(17,837	)
	Foreign exchange contracts
	Buys foreign currency, sells U.S. currency	23			$	57,112			—			—			—			—			$	57,112	$	4,007
	Buys U.S. currency, sells foreign currency	23			$	57,112			—			—			—			—			$	57,112	$	(3,984	)
		31-Dec-13
		(Dollars in thousands)
	Loan level derivatives
	Receive fixed, pay variable	168			$	48,882			97,975			42,957			42,116			329,554			$	561,484	$	9,484
	Pay fixed, receive variable	162			$	48,882			97,975			42,957			42,116			329,554			$	561,484	$	(9,523	)
	Foreign exchange contracts
	Buys foreign currency, sells U.S. currency	6			$	11,367			—			—			—			—			$	11,367	$	396
	Buys U.S. currency, sells foreign currency	6			$	11,367			—			—			—			—			$	11,367	$	(390	)
	(1) The Company may enter into one swap agreement which offsets multiple reverse swap agreements. The positions will offset and the terms will be identical.
	Mortgage Derivatives
	Prior to closing and funding certain one-to-four family residential mortgage loans, an interest rate lock commitment is generally extended to the borrower. During the period from commitment date to closing date, the Company is subject to the risk that market rates of interest may change. If market rates rise, investors generally will pay less to purchase such loans resulting in a reduction in the gain on sale of the loans or, possibly, a loss. In an effort to mitigate such risk, forward delivery sales commitments are executed, under which the Company agrees to deliver whole mortgage loans to various investors. In addition, the Company may also enter into additional Forward To Be Announced ("TBA") mortgage contracts, also considered derivative instruments, which are purchased by the Company from a diversified list of counterparties in order to hedge customer rate locks. These forward contracts carry a market price that has a strong inverse relationship to that of mortgage prices. When the Company locks a rate to the customer, the rate can be held for the benefit of the customer for a certain period of time until the mortgage is sold. During that time, the Company may not have agreed on a price with a mortgage investor and fluctuations in market conditions may cause the mortgage to lose market value. Within a short period after the rate is locked with the customer, the Company may, depending upon the effectiveness of existing hedges, execute a Forward TBA trade with a counterparty to hedge that market risk. Certain assumptions, including pull through rates and rate lock periods, are used in managing the existing and future hedges. The effectiveness of the hedges rely on the accuracy of these assumptions.
	The change in fair value on the interest rate lock commitments, forward delivery sale commitments, and forward TBA mortgage contracts are recorded in current period earnings as a component of mortgage banking income. In addition, the Company has elected the fair value option to carry loans held for sale at fair value. The change in fair value of loans held for sale is recorded in current period earnings as a component of mortgage banking income in accordance with the Company's fair value election. The change in fair value associated with loans held for sale was an increase of $18,000 and $1,000 and a decrease of $141,000 for the years ended December 31, 2014, 2013 and 2012, respectively. These amounts were offset in earnings by the change in the fair value of mortgage derivatives.
	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet at the periods indicated:
		Asset Derivatives										Liability Derivatives
				Fair Value at				Fair Value at						Fair Value at				Fair Value at
		Balance Sheet		31-Dec-14				31-Dec-13				Balance Sheet		31-Dec-14				31-Dec-13
		Location										Location
		(Dollars in thousands)
	Derivatives designated as hedges
	Interest rate derivatives	Other assets		$	—			$	—			Other liabilities		$	5,570			$	9,630
Derivatives not designated as hedges
Customer Related Positions:
Loan level derivatives	Other assets		18,383				16,301				Other liabilities		18,380				16,340
Foreign exchange contracts	Other assets		4,007				396				Other liabilities		3,984				390
Mortgage Derivatives
Interest rate lock commitments	Other assets		295				204				Other liabilities		—				—
Forward TBA mortgage contracts	Other assets		$	—			$	64			Other liabilities		$	16			$	—
Forward sales agreements	Other assets		3				—				Other liabilities		—				35
			$	22,688			$	16,965					$	22,380			$	16,765
Total			$	22,688			$	16,965					$	27,950			$	26,395
The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated:
	Years Ended December 31
	2014				2013				2012
	(Dollars in thousands)
Derivatives designated as hedges
Gain in OCI on derivatives (effective portion), net of tax	$	2,256			$	3,735			$	1,082
Loss reclassified from OCI into interest expense (effective portion)	3,662				5,723				5,417
Loss reclassified from OCI into noninterest expense (loss on termination)	$	1,122			$	—			$	—
Loss recognized in income on derivatives (ineffective portion & amount excluded from effectiveness testing)
Interest expense	$	—			$	—			$	—
Other expense	—				—				—
Total	$	—			$	—			$	—
Derivatives not designated as hedges
Changes in fair value of customer related positions
Other income	$	63			$	38			$	134
Other expense	(4		)		(116		)		(49		)
Changes in fair value of mortgage derivatives
Mortgage banking income	$	49			$	354			$	141
Total	$	108			$	276			$	226
By using derivatives, the Company is exposed to credit risk to the extent that counterparties to the derivative contracts do not perform as required. Should a counterparty fail to perform under the terms of a derivative contract, the Company’s credit exposure on interest rate swaps is limited to the net positive fair value and accrued interest of all swaps with each counterparty. The Company seeks to minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. Institutional counterparties must have an investment grade credit rating and be approved by the Company’s Board of Directors. As such, management believes the risk of incurring credit losses on derivative contracts with those counterparties is remote and losses, if any, would be immaterial. The Company had $272,000 and $3.4 million in exposure relating to institutional counterparties at December 31, 2014 and 2013, respectively. The Company’s exposure relating to customer counterparties was approximately $18.9 million and $13.6 million at December 31, 2014 and 2013, respectively. Credit exposure may be reduced by the amount of collateral pledged by the counterparty.

BALANCE_SHEET_OFFSETTING

BALANCE SHEET OFFSETTING	12 Months Ended
	Dec. 31, 2014
Offsetting [Abstract]
Balance Sheet Offsetting Disclosure [Text Block]	The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the periods indicated:
								Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts Recognized		Gross Amounts Offset in the Statement of Financial Position		Net Amounts Presented in the Statement of Financial Position		Financial Instruments (1)		Collateral Pledged		Net Amount
		December 31, 2014
		(Dollars in thousands)
	Derivative Assets
	Interest rate swaps	$	—	$	—	$	—	$	—	$	—	$	—
	Loan level derivatives	18,383		—		18,383		272		—		18,111
	Customer foreign exchange contracts	4,007		—		4,007		—		—		4,007
		$	22,390	$	—	$	22,390	$	272	$	—	$	22,118
	Derivative Liabilities
	Interest rate swaps	$	5,571	$	—	$	5,571	$	—	$	5,571	$	—
	Loan level derivatives	18,380		—		18,380		272		17,836		272
	Customer foreign exchange contracts	3,984		—		3,984		—		—		3,984
	Repurchase agreements
	Customer repurchase agreements	147,890		—		147,890		—		147,890		—
	Wholesale repurchase agreements	50,000		—		50,000		—		50,000		—
		$	225,824	$	—	$	225,824	$	272	$	221,297	$	4,255
	-1	Reflects offsetting derivative positions with the same counterparty.
								Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts Recognized		Gross Amounts Offset in the Statement of Financial Position		Net Amounts Presented in the Statement of Financial Position		Financial Instruments (1)		Collateral Pledged		Net Amount
		December 31, 2013
		(Dollars in thousands)
	Derivative Assets
	Interest rate swaps	$	—	$	—	$	—	$	—	$	—	$	—
	Loan level swaps	16,301		—		16,301		2,823		—		13,478
	Customer foreign exchange contracts	396		—		396		—		—		396
		$	16,697	$	—	$	16,697	$	2,823	$	—	$	13,874
	Derivative Liabilities
	Interest rate swaps	$	9,630	$	—	$	9,630	$	—	$	9,630	$	—
	Loan level swaps	16,340		—		16,340		2,823		10,108		3,409
	Customer foreign exchange contracts	390		—		390		—		—		390
	Repurchase agreements
	Customer repurchase agreements	149,288		—		149,288		—		149,288		—
	Wholesale repurchase agreements	50,000		—		50,000		—		50,000		—
		$	225,648	$	—	$	225,648	$	2,823	$	219,026	$	3,799
	-1	Reflects offsetting derivative positions with the same counterparty.

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	The provision for income taxes is comprised of the following components:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Current expense
	Federal	$	14,709			$	9,570			$	11,928
	State	6,350				4,357				4,664
	Total current expense	21,059				13,927				16,592
	Deferred expense (benefit)
	Federal	2,877				1,598				(1,183		)
	State	(37		)		959				(736		)
	Total deferred expense (benefit)	2,840				2,557				(1,919		)
	Total expense	$	23,899			$	16,484			$	14,673
	The difference between the statutory federal income tax rate of 35% and the effective income tax rate reported for the last three years is detailed below:
		Years Ended December 31
		2014						2013					2012
		(Dollars in thousands)
	Computed statutory federal income tax provision	$	29,310		35	%		$	23,359		35	%	$	20,055		35	%
	State taxes, net of federal tax benefit	4,104			4.9	%		3,455			5.17	%	2,553			4.46	%
	Nontaxable interest, net	(795		)	(0.95	)%		(557		)	(0.83	)%	(542		)	(0.95	)%
	New Market Tax Credits	(6,708		)	(8.01	)%		(9,000		)	(13.48	)%	(6,371		)	(11.12	)%
	Low Income Housing Project Investments	(594		)	(0.71	)%		(194		)	(0.29	)%	(196		)	(0.34	)%
	Increase in cash surrender value of life insurance and tax exempt gain on benefit payments	(1,782		)	(2.13	)%		(1,209		)	(1.81	)%	(1,612		)	(2.81	)%
	Merger and other related costs (non-deductible)	274			0.33	%		366			0.55	%	404			0.71	%
	Other, net	90			0.11	%		264			0.39	%	382			0.66	%
	Total expense	$	23,899		28.54	%		$	16,484		24.7	%	$	14,673		25.61	%
	The tax-effected components of the net deferred tax asset at December 31 were as follows:
		2014				2013
		(Dollars in thousands)
	Deferred tax assets
	Accrued expenses not deducted for tax purposes	$	10,666			$	8,530
	Allowance for loan losses	22,462				21,743
	Deferred gain on sale leaseback transaction	2,579				3,104
	Derivatives fair value adjustment	1,882				3,440
	Employee and director equity compensation	2,380				2,351
	Federal Home Loan Bank borrowings fair value adjustment	83				220
	Loan basis difference fair value adjustment	2,094				1,819
	Net operating loss carry-forward	230				1,671
	Net unrealized loss on securities available for sale	—				1,418
	New Markets Tax Credit carry-forward	521				2,257
	Other-than-temporary impairment on securities	4,072				4,074
	Other	1,426				1,481
	Total	$	48,395			$	52,108
	Deferred tax liabilities
	Core deposit and other intangibles	$	3,194			$	4,052
	Deferred loan fees, net	4,164				3,530
	Fixed assets	4,875				5,571
	Goodwill	14,194				13,030
	Net unrealized gain on securities available for sale	2,075				—
	Other	1,180				956
	Total	$	29,682			$	27,139
	Total net deferred tax asset	$	18,713			$	24,969
	The Company has determined that a valuation allowance is not required for any of its deferred tax assets since it is more likely than not that these assets will be realized principally through the utilization of carry-back provisions to taxable income on prior years and future reversals of existing taxable temporary differences and by offsetting other future taxable income.
	Uncertainty in Income Taxes
	From time to time, the Internal Revenue Service (the "IRS") may review and/or challenge specific tax positions taken by the Company in its ordinary course of business. The Company believes that its income tax returns have been filed based upon applicable statutes, regulations and case law in effect at the time of filing, however, the IRS could disagree with the Company's interpretation. The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits:
		(Dollars in thousands)
	Balance at December 31, 2012	$	126
	Reduction of tax positions for prior years	(113		)
	Increase for prior year tax position	42
	Increase for current year tax positions	—
	Balance at December 31, 2013	$	55
	Reduction of tax positions for prior years	(55		)
	Increase for prior year tax positions	—
Increase for current year tax positions	—
Balance at December 31, 2014	$	—
Increases to the Company's unrealized tax positions occur as a result of accruing for the unrecognized tax benefit as well the accrual of interest and penalties related to prior year positions. Decreases in the Company's unrealized tax positions occur as a result of the statute of limitation lapsing on prior year positions and/or settlements relating to outstanding positions. All of the Company’s unrecognized tax benefits, if recognized, would be recorded as a component of income tax expense therefore affecting the effective tax rate. The Company records interest and penalties related to uncertain tax positions in the provision for income taxes.
The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as in various states. The Company is subject to U.S. federal, state and local income tax examinations by tax authorities for the 2011 through 2013 tax years including any related income tax filings from its recent Bank acquisitions. The Company is utilizing net operating loss carry forwards acquired from the Central and Mayflower acquisitions that are subject to annual change in ownership limitations. In addition, the Company has a general business credit carry forward that resulted from 2014 operations that can be used to reduce future federal income tax. The net operating loss carry forwards of $607,000 will expire at various dates through 2031 and the general business credit carryforward of $521,000 will expire in 2034. The Company anticipates utilizing these carry forwards prior to their expirations.

LOW_INCOME_HOUSING_PROJECT_INV

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments	12 Months Ended
	Dec. 31, 2014
Low Income Housing Project Investments [Abstract]
Investments in Low Income Housing Projects [Text Block]	LOW INCOME HOUSING PROJECT INVESTMENTS
	The Company has invested in Low Income Housing Projects that generate Low Income Housing Tax Credits (“LIHTC”) and which provide the Company with tax credits and operating loss tax benefits over a period of approximately 15 years. None of the original investment is expected to be repaid. The investment in LIHTC projects is being accounted for using the proportional amortization method, under which the Company amortizes the initial cost of the investment in proportion to the amount of the tax credits and other tax benefits received and recognizes the net investment benefit in the income statement as a component of income tax expense (benefit). The retroactive application of the adoption of this accounting treatment was assessed and deemed to have an immaterial impact on the prior year, therefore prior year numbers have not been restated.
	The following table presents certain information related to the Company's investments in low income housing projects as of December 31:
		2014		2013
		(Dollars in thousands)
	Original investment value	$	40,541	$	1,701
	Current recorded investment	38,943		1,193
	Unfunded liability obligation	28,004		51
	Tax credits and benefits earned during the year	1,683		236
	Amortization of investments during the year	1,089		187
	Net income tax benefit recognized during the year	594		49

EMPLOYEE_BENEFIT_PLANS

EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS
	Pension
	The Company maintains a multiemployer defined benefit pension plan (the “Pension Plan”) administered by Pentegra Retirement Services (the “Fund” or “Pentegra Defined Benefit Plan for Financial Institutions”). The Fund does not segregate the assets or liabilities of all participating employers and accordingly, disclosure of plan assets, accumulated vested and nonvested benefits is not possible. Effective July 1, 2006, the Company froze the defined benefit plan by eliminating all future benefit accruals. Contributions to the Pension Plan are based on each individual employer’s experience. The Company bears the market risk relating to the Pension Plan and will continue to fund the Pension Plan as required. The Pension Plan year is July 1st through June 30th.
	The Company’s participation in the Pension Plan for the annual period ended December 31, 2014, is outlined in the table below. The “EIN/Pension Plan Number” column provides the Employee Identification Number (“EIN”) and the three-digit plan number. The funding status of the Pension Plan is determined on the basis of the financial statements provided by the Fund using total plan assets and accumulated benefit obligation. The “FIP/RP Status Pending/Implemented” column indicates plans for which a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) is either pending or has been implemented. The “Expiration Date of Collective-Bargaining Agreement” column lists the expiration date(s) of any collective-bargaining agreement(s) to which the Pension Plan is subject.
				Funding Status			FIP/RP Status	Surcharge		Expiration	Minimum
				of Pension Plan			Pending/	Imposed		Date of	Contributions
							Implemented			Collective-	Required for
										Bargaining	Future
		EIN/Pension		2014	2013					Agreement	Periods
		Plan Number
	Pentegra defined benefit plan for financial institutions	13-5645888/333		At least 80 percent	At least 80 percent		No	No		N/A	$	—
	Contributions to the Fund are based on each individual employer’s experience. The Company’s total contributions to the Pension Plan did not represent more than 5% of the total contributions to the Pension Plan as indicated in the Pension Plan’s most recently available annual report dated June 30, 2014. The comparability of employer contributions is impacted by asset performance, discount rates and the reduction in the number of covered employees year over year.
	The Company’s contributions to the Pension Plan were as follows for the periods indicated:
					Plan Year Allocation
		Cash Payment			2014-2015			2013-2014			2012-2013
		(Dollars in thousands)
	2014	$	1,320		$	1,320		$	—		$	—
	2013	2,603			—			1,762			841
	2012	234			—			—			234
	The Company’s total defined benefit plan expense was $1.5 million, $1.4 million, and $1.6 million, for the years ending December 31, 2014, 2013, and 2012, respectively.
	Financial information for the Fund is made available through the public Form 5500 which is available by April 15th of the year following the plan year end.
	Postretirement Benefit Plans
	Employees retiring from the Bank after attaining age 65, who have rendered at least 10 years of continuous service are entitled to a fixed contribution toward the premium for postretirement health care benefits and a $5,000 benefit paid upon death. The health care benefits are subject to deductibles, co-payment provisions and other limitations. The Bank may amend or change these benefits periodically. Additionally, the Company has acquired small postretirement plans in conjunction with various acquisitions, which do not have a material impact on the amount of expense realized by the Company.
	Supplemental Executive Retirement Plans
	The Bank maintains defined benefit supplemental executive retirement plans (“SERP”) for certain highly compensated employees designed to offset the impact of regulatory limits on benefits under qualified pension plans. The Bank also maintains defined benefit SERPs acquired from previous acquisitions. The Bank has established and funded Rabbi Trusts to accumulate funds in order to satisfy the contractual liability of these supplemental retirement plan benefits. These agreements provide for the Bank to pay all benefits from its general assets, and the establishment of these trust funds does not reduce nor otherwise affect the Bank’s continuing liability to pay benefits from such assets except that the Bank’s liability shall be offset by actual benefit payments made from the trusts. The related trust assets, included in the Company's available for sale securities portfolio, totaled $8.8 million and $8.5 million at December 31, 2014 and 2013, respectively.
	During 2014, the Company amended the retirement benefit amounts for certain participants. The Company then froze its SERP by closing it to new participants and restricting future adjustments to the retirement benefit amounts.
	The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plan which were used only to pay the current year benefits as of the dates indicated:
		2014			2013			2012
		(Dollars in thousands)
	Retirement expense	$	954		$	1,049		$	1,144
	Contributions paid	271			253			253
	The following table shows the Company's best estimate of the benefits expected to be paid in each of the next five years, in the aggregate for the next five fiscal years thereafter and in the aggregate after those 10 years:
		Defined Benefit Supplemental Executive
		Retirement Plans
		Expected Benefit
		Payment
		(Dollars in thousands)
	2015	$	315
	2016	437
	2017	431
	2018	466
	2019	515
	2020-2024	3,600
	The measurement date used to determine the defined benefit supplemental executive retirement plans benefits is December 31st for each of the years reported. The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented:
		Defined Benefit Supplemental Executive
		Retirement Benefits
		2014			2013			2012
		(Dollars in thousands)
	Change in accumulated benefit obligation
	Benefit obligation at beginning of year	$	8,243		$	8,714		$	7,550
	Accumulated service cost	397			429			627
	Interest cost	390			409			296
	Plan amendment	1,357			—			—
	Actuarial loss/(gain)	2,421			(1,056		)	494
	Benefits paid	(271		)	(253		)	(253		)
	Accumulated benefit obligation at end of year	$	12,537		$	8,243		$	8,714
	Change in plan assets
	Fair value of plan assets at beginning of year	$	—		$	—		$	—
	Employer contribution	271			253			253
	Benefits paid	(271		)	(253		)	(253		)
	Fair value of plan assets at end of year	$	—		$	—		$	—
	Funded status at end of year	$	(12,537	)	$	(8,243	)	$	(8,714	)
	Assets	—			—			—
	Liabilities	(12,537		)	(8,243		)	(8,714		)
Accrued benefit cost	$	(12,537	)	$	(8,243	)	$	(8,714	)
Amounts recognized in accumulated other comprehensive income (“AOCI”)
Net loss	$	3,305		$	938		$	2,157
Prior service cost	1,904			659			745
Amounts recognized in AOCI	$	5,209		$	1,597		$	2,902
Information for plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$	12,537		$	8,243		$	8,714
Accumulated benefit obligation	$	12,537		$	8,243		$	8,714
Net periodic benefit cost
Service cost	$	397		$	429		$	627
Interest cost	390			409			296
Amortization of prior service cost	113			113			113
Recognized net actuarial gain	54			155			108
Net periodic benefit cost	$	954		$	1,106		$	1,144
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Net actuarial loss	$	309		$	18		$	151
Net prior service cost	$	947		$	113		$	99
Discount rate used for benefit obligation	2.24-3.84%			4.95		%	4.05		%
Discount rate used for net periodic benefit cost	2.43-4.76%			4.05		%	4.4		%
Rate of compensation increase	n/a			n/a			n/a
During 2014, the Company adopted a non-qualified 401(k) Restoration Plan ("Restoration Plan") for certain executive officers. The Restoration Plan is intended to contribute to each participant the amount of matching and discretionary contributions which would have been made to the existing Rockland Trust 401(k) plan on the participant's behalf, but were prohibited due to Internal Revenue Code limitations. The Company recognized expense of $56,000 related to this plan for services already performed for the year ended December 31, 2014.
Other Employee Benefits
The Bank from time to time creates an incentive compensation plan for senior management and other officers to participate in at varying levels. In addition, the Bank may also pay a discretionary bonus to senior management, officers, and/or nonofficers of the Bank. The expense for the incentive plans and the discretionary bonus amounted to $8.5 million in both 2014 and 2013 and $7.8 million in 2012.
The Bank has an Employee Savings Plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the Employee Savings Plan, participating employees may defer a portion of their earnings, not to exceed the Internal Revenue Service annual contribution limits. The Bank matches 25% of each employee’s contributions up to 6% of the employee’s earnings. The 401(k) Plan incorporates an Employee Stock Ownership Plan for contributions invested in the Company’s common stock. This Plan also provides nondiscretionary contributions in which employees, with one year and 1,000 hours of service, receive a 5% cash contribution of eligible pay up to the social security limit and a 10% cash contribution of eligible pay over the social security limit up to the maximum amount permitted by law. Benefits contributed to employees under this defined contribution plan vest immediately. The defined contribution plan expense was $4.2 million in 2014, $3.9 million in 2013, and $3.6 million in 2012.
During 2014, the Company adopted a non-qualified deferred compensation plan which allows for deferrals of incentive payments until an elected distribution date in the future. This deferred compensation plan is available to certain highly compensated employees. Deferrals are invested at the election of the participant into one of the actively managed funds made available to the participant through the Company's Investment Management Group. The funds are held in a Rabbi Trust until elected date of distribution.
As a result of the Central acquisition during 2012, the Company acquired an Employee Stock Ownership Plan. The Company has received approval to terminate the plan from the Internal Revenue Service, and is in the process of making final distributions.
Director Benefits
The Company maintains a deferred compensation plan for the Company’s Board of Directors. The Board of Directors is entitled to elect to defer their director’s fees until retirement. If the Director elects to do so, their compensation is invested in the Company’s stock and maintained within the Company’s Investment Management Group. The amount of compensation deferred during 2014, 2013, and 2012 was $135,000, $107,000, and $88,000, respectively. At December 31, 2014 and 2013 the Company had 176,849 and 178,765 of shares provided for the plan with a related liability of $3.7 million and $3.4 million established within shareholders’ equity, respectively.

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 a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. Therefore, even when market assumptions are not readily available, the Company’s own assumptions are set to reflect those that market participants would use in pricing the asset or liability at the measurement date. If there has been a significant decrease in the volume and level of activity for the asset or liability, regardless of the valuation technique(s) used, the objective of a fair value measurement remains the same. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. The Company uses prices and inputs that are current as of the measurement date. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified from one level to another.
	The Fair Value Measurements and Disclosures Topic of the FASB ASC defines fair value and establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under the Fair Value Measurements and Disclosures Topic of the FASB ASC are described below:
	Level 1 – Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.
	Level 2 – Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.
	Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.
	To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.
	Valuation Techniques
	There have been no changes in the valuation techniques used during the current period.
	Securities:
	U.S. Government Agency Securities
	Fair value is estimated using either multi-dimensional spread tables or benchmarks. The inputs used include benchmark yields, reported trades, and broker/dealer quotes. These securities are classified as Level 2.
	Agency Mortgage-Backed Securities
	Fair value is estimated using either a matrix or benchmarks. The inputs used include benchmark yields, reported trades, broker/dealer quotes, and issuer spreads. These securities are categorized as Level 2.
	Agency Collateralized Mortgage Obligations
	The valuation model for these securities is volatility-driven and ratings based, and uses multi-dimensional spread tables. The inputs used include benchmark yields, recent reported trades, new issue data, broker and dealer quotes, and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are categorized as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2.
	State, County, and Municipal Securities
	The fair value is estimated using a valuation matrix with inputs including bond interest rate tables, recent transaction, and yield relationships. These securities are categorized as Level 2.
	Single and Pooled Issuer Trust Preferred Securities
	The fair value of trust preferred securities, including pooled and single issuer preferred securities, is estimated using external pricing models, discounted cash flow methodologies or similar techniques. The inputs used in these valuations include benchmark yields, recent reported trades, new issue data, broker/dealer quotes and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are categorized as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2.
	Equity Securities
	These equity securities and mutual funds are valued based on market quoted prices. These securities are categorized in Level 1 as they are actively traded and no valuation adjustments have been applied.
	Loans Held for Sale
	The Company has elected the fair value option to account for originated closed loans intended for sale. The fair value is measured on an individual loan basis using quoted market prices and when not available, comparable market values or discounted cash flow analysis may be utilized. These assets are typically categorized as Level 2.
	Derivative Instruments
	Derivatives
	The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The Company incorporates credit valuation adjustments to appropriately reflect nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings. Additionally, in conjunction with fair value measurement guidance, the Company has made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Although the Company has determined that the majority of the inputs used to value its interest rate derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of December 31, 2014 and 2013, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2.
	Mortgage Derivatives
	The fair value of mortgage banking derivatives is determined based on current market prices for similar assets in the secondary market and, therefore, classified within Level 2 of the fair value hierarchy.
	Impaired Loans
	Collateral dependent loans that are deemed to be impaired are valued based upon the lower of cost or fair value of the underlying collateral less costs to sell.  The inputs used in the appraisals of the collateral are not always observable, and therefore the loans may be categorized as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2.
	Other Real Estate Owned and Other Foreclosed Assets
	The fair values are generally estimated based upon recent appraisal values of the property less costs to sell the property, as Other Real Estate Owned ("OREO") and Other Foreclosed Assets are valued at the lower of cost or fair value of the property, less estimated costs to sell. Certain inputs used in appraisals are not always observable, and therefore OREO and Other Foreclosed Assets may be categorized as Level 3 within the fair value hierarchy.
	Goodwill and Other Intangible Assets
	Goodwill and identified intangible assets are subject to impairment testing. The Company conducts an annual impairment test of goodwill in the third quarter of each year, or more frequently if necessary, and other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. To estimate the fair value of goodwill and, if necessary, other intangible assets the Company utilizes both a comparable analysis of relevant price multiples in recent market transactions and discounted cash flow analysis. Both valuation models require a significant degree of management judgment. In the event the fair value as determined by the valuation model is less than the carrying value, the intangibles may be impaired. If the impairment testing resulted in impairment, the Company would classify the impaired goodwill and other intangible assets subjected to nonrecurring fair value adjustments as Level 3.
	Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated:
					Fair Value Measurements at Reporting Date Using
		Balance			Quoted Prices in			Significant Other				Significant
					Active Markets			Observable				Unobservable
					for Identical			Inputs				Inputs
					Assets			(Level 2)				(Level 3)
					(Level 1)
		(Dollars in thousands)
		December 31, 2014
	Recurring fair value measurements
	Assets
	Securities available for sale
	U.S. Government agency securities	$	41,486		$	—		$	41,486			$	—
	Agency mortgage-backed securities	217,678			—			217,678				—
	Agency collateralized mortgage obligations	63,035			—			63,035				—
	State, county, and municipal securities	5,223			—			5,223				—
	Single issuer trust preferred securities issued by banks and insurers	2,909			—			2,909				—
	Pooled trust preferred securities issued by banks and insurers	6,321			—			—				6,321
	Equity securities	11,902			11,902			—				—
	Loans held for sale	6,888			—			6,888				—
	Derivative instruments	22,688			—			22,688				—
	Liabilities
	Derivative Instruments	27,950			—			27,950				—
	Total recurring fair value measurements	$	350,180		$	11,902		$	331,957			$	6,321
	Nonrecurring fair value measurements
	Assets
	Collateral dependent impaired loans	$	8,196		$	—		$	—			$	8,196
	Other real estate owned and other foreclosed assets	7,743			—			—				7,743
	Total nonrecurring fair value measurements	$	15,939		$	—		$	—			$	15,939
	(Dollars in thousands)
	31-Dec-13
Recurring fair value measurements
Assets
Securities available for sale
U.S. Government agency securities	$	40,449		$	—		$	40,449			$	—
Agency mortgage-backed securities	234,591			—			234,591				—
Agency collateralized mortgage obligations	58,153			—			58,153				—
State, county, and municipal securities	5,412			—			5,412				—
Single issuer trust preferred securities issued by banks and insurers	2,952			—			2,952				—
Pooled trust preferred securities issued by banks and insurers	3,841			—			—				3,841
Equity securities	11,464			11,464			—				—
Loans held for sale	8,882			—			8,882				—
Derivative instruments	16,965			—			16,965				—
Liabilities
Derivative instruments	26,395			—			26,395				—
Total recurring fair value measurements	$	356,314		$	11,464		$	341,009			$	3,841
Nonrecurring fair value measurements:
Assets
Collateral dependent impaired loans	$	10,328		$	—		$	—			$	10,328
Other real estate owned and other foreclosed assets	7,633			—			—				7,633
Total nonrecurring fair value measurements	$	17,961		$	—		$	—			$	17,961
The table below presents a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). These instruments were valued using pricing models and discounted cash flow methodologies. The following table provides a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated:
	Securities Available for Sale
	(Dollars in thousands)
	31-Dec-14						31-Dec-13											31-Dec-12
	Pooled			Total			Pooled				Private				Total			Pooled			Single			Private			Total
	Trust						Trust				Mortgage-							Trust			Trust			Mortgage-
	Preferred						Preferred				Backed							Preferred			Preferred			Backed
	Securities						Securities				Securities							Securities			Securities			Securities
Beginning balance	$	3,841		$	3,841		$	2,981			$	3,532			$	6,513		$	2,820		$	4,210		$	6,110		$	13,140
Gains and (losses) (realized/unrealized)
Included in earnings	—			—			—				—				—			—			—			(76		)	(76		)
Included in other comprehensive income	2,655			2,655			1,132				(64		)		1,068			313			703			411			1,427
Sales	—			—			—				(2,695		)		(2,695		)	—			—			—			—
Settlements	(175		)	(175		)	(272		)		(773		)		(1,045		)	(152		)	—			(2,913		)	(3,065		)
Transfers into (out of) level 3	$	—		$	—		$	—			$	—			$	—		$	—		$	(4,913	)	$	—		$	(4,913	)
Ending balance	$	6,321		$	6,321		$	3,841			$	—			$	3,841		$	2,981		$	—		$	3,532		$	6,513
During the years ended December 31, 2014 and 2013, there were no transfers between the Levels of the fair value hierarchy for any assets or liabilities measured at fair value on a recurring basis and during 2012 the Company transferred the Single Issuer Trust Preferred Security from Level 3 to Level 2. The reason for the transfer was increased trading of the security, enabling the use of more observable inputs. It is the Company's policy to recognize such transfers as of the end of the reporting period.
The following table sets forth certain unobservable inputs regarding the Company's investment in securities that are classified as Level 3:
		December 31,								December 31,				December 31,
		2014			2013					2014		2013		2014		2013
Valuation Technique		Fair Value						Unobservable Inputs		Range				Weighted Average
		(Dollars in Thousands)
Discounted cash flow methodology
Pooled trust preferred securities		$	6,321		$	3,841		Cumulative prepayment		0% - 75%		0% - 76%		7.00%		7.20%
								Cumulative default		3% - 100%		3% - 100%		13.90%		18.10%
								Loss given default		85% - 100%		85% - 100%		96.10%		95.70%
								Cure given default		0% - 75%		0% - 75%		46.70%		39.90%
Appraisals of collateral (1)
Impaired loans		$	8,196		$	10,328
Other real estate owned and foreclosed assets		$	7,743		$	7,633
-1	Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.
For the fair value measurements in the table above, which are classified as Level 3 within the fair value hierarchy, the Company’s Treasury and Finance groups determine the valuation policies and procedures. For the pricing of the securities, the Company uses third-party pricing information, without adjustment. Depending on the type of the security, management employs various techniques to analyze the pricing it receives from third parties, such as analyzing changes in market yields and in certain instances reviewing the underlying collateral of the security. Management reviews changes in fair value from period to period and performs testing to ensure that prices received from the third parties are consistent with their expectation of the market. For the securities whose market is deemed to be inactive and which are categorized as Level 3, the fair value models are calibrated and significant inputs are back tested on a quarterly basis, to the extent possible. This testing is done by the third party service provider, who performs this testing by comparing anticipated inputs to actual results. Significant changes in fair value from period to period are closely scrutinized to ensure fair value models are not flawed. The driver(s) of the respective change in fair value and the method for forecasting the driver(s) is closely considered by management.
The significant unobservable inputs used in the fair value measurement of the Company’s pooled trust preferred securities are cumulative prepayment rates, cumulative defaults, loss given defaults and cure given defaults. Significant increases (decreases) in deferrals or defaults, in isolation, would result in a significantly lower (higher) fair value measurement. Alternatively, significant increases (decreases) in cure rates, in isolation, would result in a significantly higher (lower) fair value measurement.
Additionally, the Company has financial instruments which are marked to fair value on a nonrecurring basis which are categorized within Level 3. These instruments include collateral dependent impaired loans and OREO. The determination of the fair value amount is derived from the use of independent third party appraisals and evaluations, prepared by firms from a predetermined list of qualified and approved appraisers or evaluators. Upon receipt of an appraisal or evaluation, the internal Commercial Real Estate Appraisal Department will review the report for compliance with regulatory and Bank standards, as well as reasonableness and acceptance of the value conclusions. Any issues or concerns regarding compliance or value conclusions will be addressed with the engaged firm and the report may be adjusted or revised. If a disagreement cannot be resolved, the Commercial Real Estate Appraisal Department will either address the key issues and modify the report for acceptance or reject the report and re-order a new report. Ultimately the Company’s Commercial Real Estate Appraisal Department will confirm the collateral value as part of its review process.
The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the periods indicated:
							Fair Value Measurements at Reporting Date Using
	Book Value			Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	31-Dec-14
	(Dollars in thousands)
Financial assets
Securities held to maturity(a)
U.S. Treasury securities	$	1,010		$	1,073		$	—			$	1,073			$	—
Agency mortgage-backed securities	159,522			164,944			—				164,944				—
Agency collateralized mortgage obligations	207,995			206,658			—				206,658				—
State, county, and municipal securities	424			428			—				428				—
Single issuer trust preferred securities issued by banks	1,500			1,477			—				1,477				—
Corporate debt securities	5,002			5,119			—				5,119				—
Loans, net of allowance for loan losses(b)	4,915,633			4,883,479			—				—				4,883,479
Financial liabilities
Time certificates of deposits(c)	$	649,620		$	651,180		$	—			$	651,180			$	—
Federal Home Loan Bank borrowings(c)	70,080			70,208			—				70,208				—
Customer repurchase agreements and other short-term borrowings(c)	147,890			147,890			—				—				147,890
Wholesale repurchase agreements(c)	50,000			50,510			—				—				50,510
Junior subordinated debentures(d)	73,685			70,045			—				70,045				—
Subordinated debentures(c)	65,000			64,198			—				—				64,198
	31-Dec-13
Financial assets	(Dollars in thousands)
Securities held to maturity(a)
U.S. Treasury securities	$	1,011		$	1,042		$	—			$	1,042			$	—
Agency mortgage-backed securities	155,067			155,951			—				155,951				—
Agency collateralized mortgage obligations	187,388			182,036			—				182,036				—
State, county, and municipal securities	678			685			—				685				—
Single issuer trust preferred securities issued by banks	1,503			1,526			—				1,526				—
Corporate debt securities	5,005			5,215			—				5,215				—
Loans, net of allowance for loan losses(b)	4,665,068			4,655,920			—				—				4,655,920
Financial liabilities
Time certificates of deposits(c)	$	743,628		$	746,908		$	—			$	746,908			$	—
Federal Home Loan Bank borrowings(c)	140,294			140,321			—				140,321				—
Customer repurchase agreements and other short-term borrowings(c)	154,288			154,349			—				—				154,349
Wholesale repurchase agreements(c)	50,000			51,298			—				—				51,298
Junior subordinated debentures(d)	73,906			67,481			—				67,481				—
Subordinated debentures(c)	30,000			28,396			—				—				28,396
(a)	The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.
(b)	Fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows.
(c)	Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
(d)	Fair value was determined based upon market prices of securities with similar terms and maturities.
This summary excludes financial assets and liabilities for which the carrying value approximates fair value. For financial assets, these include cash and due from banks, federal funds sold, short-term investments, Federal Home Loan Bank stock, and cash surrender value of life insurance policies. For financial liabilities, these include demand, savings, money market deposits, and federal funds purchased. The estimated fair value of demand, savings and money market deposits is the amount payable at the reporting date. These instruments would all be considered to be classified within Level 1 of the fair value hierarchy. Also excluded from the summary are financial instruments measured at fair value on a recurring and nonrecurring basis, as previously described.
The Company considers its financial instruments' current use to be the highest and best use of the instruments.

OTHER_COMPREHENSIVE_LOSS

OTHER COMPREHENSIVE LOSS	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
OTHER COMPREHENSIVE LOSS	OTHER COMPREHENSIVE LOSS
	The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
		Year Ended December 31, 2014
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	9,095		$	(3,570	)	$	5,525
	Less: net security gains reclassified into other noninterest income	191			(78		)	113
	Net change in fair value of securities available for sale	8,904			(3,492		)	5,412
	Change in fair value of cash flow hedges (2)	(969		)	396			(573		)
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(3,662		)	1,496			(2,166		)
	Less: loss on termination of hedge reclassified into noninterest expense	(1,122		)	459			(663		)
	Net change in fair value of cash flow hedges	3,815			(1,559		)	2,256
	Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period	(2,699		)	1,103			(1,596		)
	Net prior service costs related to plan amendment arising during the period	(1,357		)	554			(803		)
	Less: amortization of actuarial gains	44			(18		)	26
	Less: amortization of prior service costs	(102		)	42			(60		)
	Less: amortization of transfer obligations	2			(1		)	1
	Net change in other comprehensive income for defined benefit postretirement plans	(4,000		)	1,634			(2,366		)
	Total other comprehensive income	$	8,719		$	(3,417	)	$	5,302
		Year Ended December 31, 2013
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	(11,943	)	$	4,578		$	(7,365	)
	Less: net security gains reclassified into other noninterest income	230			(94		)	136
	Net change in fair value of securities available for sale	(12,173		)	4,672			(7,501		)
	Change in fair value of cash flow hedges (2)	592			(242		)	350
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(5,723		)	2,338			(3,385		)
	Net change in fair value of cash flow hedges	6,315			(2,580		)	3,735
	Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period	1,302			(532		)	770
	Net prior service costs related to plan amendments arising during the period
	Less: amortization of actuarial losses	(42		)	17			(25		)
	Less: amortization of prior service costs	(102		)	42			(60		)
	Less: amortization of transfer obligations	(4		)	1			(3		)
	Net change in other comprehensive income for defined benefit postretirement plans	1,450			(592		)	858
	Total other comprehensive loss	$	(4,408	)	$	1,500		$	(2,908	)
		Year Ended December 31, 2012
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	(1,682	)	$	541		$	(1,141	)
	Less: net security losses reclassified into other noninterest income (1)	(76		)	31			(45		)
	Net change in fair value of securities available for sale	(1,606		)	510			(1,096		)
	Change in fair value of cash flow hedges (2)	(3,588		)	1,466			(2,122		)
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(5,417		)	2,213			(3,204		)
	Net change in fair value of cash flow hedges	1,829			(747		)	1,082
	Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period	(196		)	80			(116		)
	Net prior service costs related to plan amendments arising during the period
	Less: amortization of actuarial losses	(5		)	2			(3		)
	Less: amortization of prior service costs	(113		)	46			(67		)
	Less: amortization of transfer obligations	(34		)	14			(20		)
	Net change in other comprehensive income for defined benefit postretirement plans	(44		)	18			(26		)
	Total other comprehensive loss	$	179		$	(219	)	$	(40	)
	-1	Net security losses represent pre-tax OTTI credit related losses of $76,000 for the year ended December 31, 2012.
	-2	The change in fair value of cash flow hedges includes the remaining balance of a realized but unrecognized gain from the termination of interest rate swaps in June 2009. The original gain of $1.4 million net of tax, will be recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain had amortized to $571,000, $715,000, and $859,000 at December 31, 2014, 2013, and 2012, respectively.
	-3	The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans.
	Information on the Company's accumulated other comprehensive loss, net of tax, is comprised of the following components as of the periods indicated:
		Unrealized Gain on Securities			Unrealized Loss on Cash Flow Hedge			Deferred Gain on Hedge Transactions			Defined Benefit Postretirement Plans			Accumulated Other Comprehensive Loss
		(Dollars in Thousands)
	Beginning balance: January 1, 2012	$	6,574		$	(10,804	)	$	1,004		$	(1,260	)	$	(4,486	)
	Net change in other comprehensive income (loss)	(1,096		)	1,227			(145		)	(26		)	(40		)
	Ending balance: December 31, 2012	$	5,478		$	(9,577	)	$	859		$	(1,286	)	$	(4,526	)
	Net change in other comprehensive income (loss)	(7,501		)	3,879			(144		)	858			(2,908		)
Ending balance: December 31, 2013	$	(2,023	)	$	(5,698	)	$	715		$	(428	)	$	(7,434	)
Net change in other comprehensive income (loss)	5,412			2,400			(144		)	(2,366		)	5,302
Ending balance: December 31, 2014	$	3,389		$	(3,298	)	$	571		$	(2,794	)	$	(2,132	)

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES
	Financial Instruments with Off-Balance Sheet Risk
	In the normal course of business, the Company enters into various transactions to meet the financing needs of its customers, which, in accordance with generally accepted accounting principles are not included in its consolidated balance sheets. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures.
	The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of these commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. Standby letters of credit are written conditional commitments issued to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment were funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements.
	The fees collected in connection with the issuance of standby letters of credit are representative of the fair value of its obligation undertaken in issuing the guarantee. In accordance with applicable accounting standards related to guarantees, fees collected in connection with the issuance of standby letters of credit are deferred. The fees are then recognized in income proportionately over the life of the standby letter of credit agreement. The deferred standby letter of credit fees represent the fair value of the Company's potential obligations under the standby letter of credit guarantees.
	The following table summarizes the above financial instruments at the dated indicated:
		2014		2013
		(Dollars In thousands)
	Commitments to extend credit	$	1,822,369	$	1,621,873
	Standby letters of credit	18,516		18,923
	Deferred standby letter of credit fees	105		87
	Lease Commitments
	The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. The following is a schedule of minimum future lease payments under such leases as of December 31, 2014:
		(Dollars In thousands)
	2015	$	7,945
	2016	7,540
	2017	7,040
	2018	5,659
	2019	4,932
	Thereafter	9,743
	Total future minimum lease commitments	$	42,859
	Rent expense incurred under operating leases was approximately $7.9 million in 2014, $7.6 million in 2013, and $7.0 million in 2012. Renewal options ranging from 1-10 years exist for several of these leases.
	The Company has entered into lease agreements with related third parties on substantially the same terms as those prevailing at the time for comparable transactions with unrelated parties. Rent expense incurred under related third party leases was approximately $1.0 million in 2014, 2013, and 2012, respectively.
	Other Contingencies
	At December 31, 2014, Rockland Trust was involved in pending lawsuits that arose in the ordinary course of business. Management has reviewed these pending lawsuits with legal counsel and has taken into consideration the view of counsel as to their outcome. In the opinion of management, the final disposition of pending lawsuits is not expected to have a material adverse effect on the Company’s financial position or results of operations.
	The Bank is required to maintain certain reserve requirements of vault cash and/or deposits with the Federal Reserve Bank of Boston. The amount of this reserve requirement was $33.0 million and $21.0 million at December 31, 2014 and 2013, respectively.

REGULATORY_CAPITAL_REQUIREMENT

REGULATORY CAPITAL REQUIREMENTS	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
REGULATORY CAPITAL REQUIREMENTS	REGULATORY MATTERS
	Regulatory Capital Requirements
	The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. 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 financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of Total and Tier 1 Capital (as defined for regulatory purposes) to average assets (as defined for regulatory purposes) and Tier 1 Capital to risk weighted assets (as defined for regulatory purposes). Management believes, as of December 31, 2014 and 2013 that the Company and the Bank met all capital adequacy requirements to which they are subject.
	At December 31, 2014 the most recent notification from the Federal Deposit Insurance Corporation indicated that the Bank's capital levels met or exceeded the minimum levels to be considered "well capitalized" for bank regulatory purposes. To be categorized as well capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since the notification that management believes have changed the Bank’s category. The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2014 and 2013 are also presented in the table that follows:
		Actual				For Capital					To Be Well Capitalized
						Adequacy Purposes					Under Prompt
											Corrective Action
											Provisions
		Amount		Ratio		Amount			Ratio		Amount			Ratio
		31-Dec-14
		(Dollars in thousands)
	Independent Bank Corp.
	Total capital (to risk weighted assets)	$	666,898	13.15	%	$	405,650	≥	8	%	N/A			N/A
	Tier 1 capital (to risk weighted assets)	551,836		10.88		202,825		≥	4		N/A			N/A
	Tier 1 capital (to average assets)	551,836		8.84		249,825		≥	4		N/A			N/A
	Rockland Trust Company
	Total capital (to risk weighted assets)	$	607,100	11.98	%	$	405,465	≥	8	%	$	506,831	≥	10	%
	Tier 1 capital (to risk weighted assets)	527,038		10.4		202,732		≥	4		304,099		≥	6
	Tier 1 capital (to average assets)	527,038		8.44		249,788		≥	4		312,235		≥	5
		December 31, 2013
		(Dollars in thousands)
	Independent Bank Corp.
	Total capital (to risk weighted assets)	$	589,811	12.58	%	$	375,117	≥	8	%	N/A			N/A
	Tier 1 capital (to risk weighted assets)	505,646		10.78		187,558		≥	4		N/A			N/A
	Tier 1 capital (to average assets)	505,646		8.64		234,153		≥	4		N/A			N/A
	Rockland Trust Company
	Total capital (to risk weighted assets)	$	582,599	12.42	%	$	375,205	≥	8	%	$	469,006	≥	10	%
	Tier 1 capital (to risk weighted assets)	498,434		10.63		187,603		≥	4		281,404		≥	6
	Tier 1 capital (to average assets)	498,434		8.51		234,154		≥	4		292,692		≥	5
	Dividend Restrictions
	In the ordinary course of business, the Company is dependent upon dividends from the Bank to provide funds for the payment of dividends to shareholders and to provide for other cash requirements. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that year combined with the retained net profits for the preceding two years. Under the foregoing dividend restrictions and while maintaining its "well capitalized" status, dividends paid by the Bank to the Company for the year ended December 31, 2014 and 2013 totaled $40.1 million and $30.6 million, respectively.
	Trust Preferred Securities
	In accordance with the applicable accounting standard related to variable interest entities, the common stock of trusts which have issued trust preferred securities have not been included in the consolidated financial statements. At December 31, 2014 and 2013, $71.0 million in trust preferred securities have been included in the Tier 1 capital of the Company for regulatory reporting purposes pursuant to the Federal Reserve's capital adequacy guidelines.

PARENT_COMPANY_FINANCIALS_ONLY

PARENT COMPANY FINANCIALS ONLY	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
PARENT COMPANY FINANCIAL STATEMENTS	PARENT COMPANY FINANCIAL STATEMENTS
	Condensed financial information relative to the Parent Company’s balance sheets at December 31, 2014 and 2013 and the related statements of income and cash flows for the years ended December 31, 2014, 2013, and 2012 are presented below. The statement of stockholders’ equity is not presented below as the parent company’s stockholders’ equity is that of the consolidated Company.
	BALANCE SHEETS
		31-Dec
		2014			2013
		(Dollars in thousands)
	Assets
	Cash (1)	$	64,791		$	16,855
	Investments in subsidiaries(2)	691,406			661,257
	Prepaid income taxes	285			—
	Deferred tax asset	2,620			3,777
	Deferred stock issuance costs	467			201
	Total assets	$	759,569		$	682,090
	Liabilities and stockholders’ equity
	Dividends payable	$	5,761		$	5,243
	Short-term borrowings	—			5,000
	Junior subordinated debentures	73,685			73,906
	Subordinated debentures	35,000			—
	Accrued income taxes	—			8
	Derivative instruments(1)	4,187			6,303
	Other liabilities	409			90
	Total liabilities	119,042			90,550
	Stockholders’ equity	640,527			591,540
	Total liabilities and stockholders’ equity	$	759,569		$	682,090
	-1	Entire balance eliminates in consolidation.
	-2	689.2 million and $659.1 million eliminate in consolidation at December 31, 2014 and 2013, respectively.
	STATEMENTS OF INCOME
		Years Ended December 31
		2014			2013			2012
		(Dollars in thousands)
	Income
	Dividends received from subsidiaries(1)	$	40,170		$	30,694		$	28,709
	Interest income(2)	57			50			83
	Total income	40,227			30,744			28,792
	Expenses
	Interest expense	4,225			4,122			3,795
	Other expenses	—			15			6
	Total expenses	4,225			4,137			3,801
	Income before income taxes and equity in undistributed income of subsidiaries	36,002			26,607			24,991
	Income tax benefit	(1,298		)	(1,342		)	(1,636		)
	Income of parent company	37,300			27,949			26,627
	Equity in undistributed income of subsidiaries	22,545			22,305			16,000
	Net income	$	59,845		$	50,254		$	42,627
	-1	Income of $53,000, $54,000 and $45,000 was not eliminated in consolidation for the years ended December 31, 2014, 2013, and 2012, respectively.
	-2	Entire balance eliminated in consolidation.
	STATEMENTS OF CASH FLOWS
		Years Ended December 31
		2014			2013			2012
		(Dollars in thousands)
	Cash flows from operating activities
	Net income	$	59,845		$	50,254		$	42,627
	Adjustments to reconcile net income to cash provided by operating activities
	Accretion	(486		)	(155		)	(13		)
	Deferred income tax expense (benefit)	293			203			(398		)
	Change in other assets	—			(373		)	5,430
	Change in other liabilities	25			206			(240		)
	Equity in undistributed income of subsidiaries	(22,545		)	(22,305		)	(16,000		)
	Net cash provided by operating activities	37,132			27,830			31,406
	Cash flows used in investing activities
	Cash paid for acquisitions, net of cash acquired	—			(10,832		)	(21,648		)
	Net cash used in investing activities	—			(10,832		)	(21,648		)
	Cash flows used in financing activities
	Proceeds from short-term borrowings	—			10,000			12,000
	Repayment of short-term borrowings	(5,000		)	(17,000		)	(10,053		)
Proceeds from subordinated debentures	35,000			—			—
Proceeds from stock issued and stock options exercised	1,692			2,475			1,242
Issuance of shares under direct stock purchase plan	1,555			969			1,691
Common dividend paid	(22,443		)	(15,122		)	(22,494		)
Net cash provided by (used in) financing activities	10,804			(18,678		)	(17,614		)
Net increase (decrease) in cash and cash equivalents	47,936			(1,680		)	(7,856		)
Cash and cash equivalents at the beginning of the year	16,855			18,535			26,391
Cash and cash equivalents at the end of the year	$	64,791		$	16,855		$	18,535

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)
		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
		2014		2013		2014		2013		2014		2013		2014		2013
						(Dollars in thousands, except per share data)
	Interest income	$	52,980	$	50,820	$	54,285	$	51,495	$	54,368	$	51,027	$	54,827	$	52,571
	Interest expense	5,374		5,958		5,232		5,880		4,805		5,831		5,007		5,666
	Net interest income	$	47,606	$	44,862	$	49,053	$	45,615	$	49,563	$	45,196	$	49,820	$	46,905
	Provision for loan losses	4,502		1,300		2,250		3,100		1,901		2,650		1,750		3,150
	Total noninterest income	17,516		15,724		16,857		16,692		17,098		18,130		18,473		17,464
	Total noninterest expenses	41,887		42,920		42,980		42,164		42,607		40,722		44,364		47,845
	Provision for income taxes	5,350		4,114		5,934		4,285		6,415		5,299		6,201		2,786
	Net income	$	13,383	$	12,252	$	14,746	$	12,758	$	15,738	$	14,655	$	15,978	$	10,588
	Basic earnings per share	0.56		0.54		0.62		0.56		0.66		0.64		0.67		0.45
	Diluted earnings per share	0.56		0.54		0.61		0.56		0.66		0.64		0.66		0.45
	Weighted average common shares (basic)	23,819,065		22,823,753		23,897,413		22,888,155		23,911,678		22,946,308		23,968,320		23,383,608
	Common stock equivalents	100,173		46,040		94,560		52,144		90,685		100,806		86,812		97,445
	Weighted average common shares (diluted)	23,919,238		22,869,793		23,991,973		22,940,299		24,002,363		23,047,114		24,055,132		23,481,053
	Unusual or infrequently occurring items
	Items within noninterest income
	Gain on extinguishment of debt	$	—	$	—	$	—	$	—	$	—	$	763	$	—	$	—
	Gain on life insurance benefits	1,627		—		337		—		—		—		—		227
	Gain on sale of fixed income securities	—		—		—		—		—		—		121		258
	Total	$	1,627	$	—	$	337	$	—	$	—	$	763	$	121	$	485
	Items within noninterest expense
	Impairment on acquired facilities	$	503	$	—	$	—	$	—	$	21	$	—	$	—	$	—
	Loss on sale of fixed income securities	—		—		—		—		—		—		21		—
	Loss on termination of derivatives	—		—		1,122		—		—		—		—		—
	Merger and acquisition expense	77		1,345		—		754		677		366		586		6,219
	Severance	—		325		—		—		—		—		—		—
	Total	$	580	$	1,670	$	1,122	$	754	$	698	$	366	$	607	$	6,219

Subsequent_Events_Notes

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS
	Peoples Federal Bancshares, Inc. Acquisition
	On February 20, 2015, the Company completed its acquisition of Peoples Federal Bancshares, Inc. ("Peoples"), the parent of Peoples Federal Saving Bank. The transaction qualified as a tax-free reorganization for federal income tax purposes and Peoples shareholders received either the right to receive $21.00 in cash per share or 0.5523 shares of the Company's stock (valued at $23.26 per share, based upon the highest trading value of the Company's stock on February 20, 2015 of $42.11). The total deal consideration was $141.8 million and was comprised of 40% cash and 60% stock consideration. The cash consideration was $55.4 million in the aggregate, inclusive of cash paid in lieu of fractional shares. The total stock consideration was $86.4 million and resulted in an increase to the Company's outstanding shares of 2,052,137 shares.
	During 2014, the Company recorded merger and acquisition expenses of $1.3 million related to the Peoples acquisition. Additionally, the Company is required to recognize the assets acquired and the liabilities assumed at their fair values as of the date of acquisition. The Company is currently in the process of evaluating the fair values and completing the initial accounting for the business combination.
	Subordinated Debt Redemption
	Subsequent to year end upon receiving regulatory approval, the Company redeemed $30.0 million of Subordinated Debt held at the Bank. This debt carried an adjustable rate of interest at LIBOR plus 300 basis points, which reset quarterly. The debt had a maturity date of October 1, 2019 and as of October 1, 2014, the debt entered the window with 5 years left until maturity. As a result, it began losing Tier 2 capital treatment. The Company did not incur a prepayment penalty as part of the redempt

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
PRINCIPLES OF CONSOLIDATION	The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates subsidiaries in which it holds, directly or indirectly, more than 50% of the voting rights and where it exercises control. Entities where the Company holds 20% to 50% of the voting rights, or has the ability to exercise significant influence or both, are accounted for under the equity method. The Company would consolidate entities deemed to be variable interest entities (VIEs) when it is determined to be the primary beneficiary, which is the party involved with the VIE that will absorb a majority of the expected losses, receive a majority of the expected residual returns or both. A legal entity is referred to as a VIE if any of the following conditions exist: (1) the total equity investment at risk is insufficient to permit the legal entity to finance its activities without additional subordinated financial support from other parties, or (2) the entity has equity investors that cannot make significant decisions about the entity’s operations or that do not absorb their proportionate share of the expected losses or receive the expected returns of the entity.
RECLASSIFICATION	Reclassification
	Certain previously reported amounts have been reclassified to conform to the current year’s presentation.
USE OF ESTIMATES	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make 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 revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for loan losses, income taxes, valuation and potential impairment of investment securities, other-than-temporary impairment (“OTTI”) of certain investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment.
SIGNIFICANT CONCENTRATIONS OF CREDIT RISK	Significant Concentrations of Credit Risk
	The vast majority of the Bank’s lending activities are conducted in the Commonwealth of Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 10% of the Bank’s loan portfolio.
CASH AND CASH EQUIVALENTS	Cash and Cash Equivalents
	For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at the Federal Reserve Bank and Federal Home Loan Bank, and federal funds sold. Generally, federal funds are sold for up to two week periods.
SECURITIES	Investment securities are classified at the time of purchase as “available for sale,” “held to maturity,” or “trading.” Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading securities would be recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity or trading, including equity securities with readily determinable fair values, are classified as “available for sale” and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
	Declines in the fair value of held to maturity and available for sale securities below their amortized cost deemed to be OTTI are written down to fair value as determined by a cash flow analysis. To the extent the estimated cash flows do not support the amortized cost, the deficiency is considered to be due to credit loss and recognized in earnings. Unless the Company intends to sell the security, or whether it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery, the remainder of the OTTI charge is considered to be due to other factors, such as liquidity or interest rates, and thus is not recognized in earnings, but rather through other comprehensive income, net of related tax. The Company evaluates individual securities that have fair values below cost for six months or longer, or for a shorter period of time if considered appropriate by management, to determine if the decline in fair value is other-than-temporary. Consideration is given to the obligor of the security, whether the security is guaranteed, whether there is a projected adverse change in cash flows, the liquidity of the security, the type of security, the capital position of security issuers, and payment history of the security, amongst other factors when evaluating such securities.
LOANS HELD FOR SALE	Loans Held for Sale
	The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes.
	The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments, forward sales commitments, and forward To Be Announced ("TBA") mortgage contracts. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Direct loan origination costs and fees are deferred upon origination and are recognized on the date of sale.
LOANS	Loans
	Loans are carried at the principal amounts outstanding, or amortized acquired fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method.  When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the amortization of any discount or accretion of any premium associated with the loan.
	Loans are generally placed on nonaccrual status if the payment of principal or interest is past due more than 90 days, or sooner if management considers such action to be prudent. As permitted by banking regulations, consumer loans past due 90 days or more may continue to accrue interest, however, such loans are usually charged-off after 120 days of delinquency. As a general rule, a commercial or real estate loan more than 90 days past due with respect to principal or interest is classified as a nonaccrual loan. However, certain commercial and real estate loans that are more than 90 days past due may be kept on an accruing status if the loan is well secured and in the process of collection. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until; it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), management no longer has doubt about the collection of principal and interest, the loan is liquidated, or the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible.  This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform.
	In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring (“TDR”). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring
ACQUIRED LOANS	All acquired loans are recorded at fair value with no carryover of the allowance for loan losses. At acquisition, loans are also reviewed to determine if the loan has evidence of deterioration in credit quality and to review if it is probable, at acquisition, that all contractually required payments will not be collected. Such loans are deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", is accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired loans are generally considered to be accruing loans because their interest income relates to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans.
	The estimate of cash flows expected to be collected is regularly re-assessed subsequent to acquisition. These re-assessments involve updates, as necessary, of the key assumptions and estimates used in the initial estimate of fair value. Generally speaking, expected cash flows are affected by:
	•	Changes in the expected principal and interest payments over the estimated life - Changes in expected cash flows may be driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows resulting from loan modifications are included in the assessment of expected cash flows.
	•	Change in prepayment assumptions - Prepayments affect the estimated life of the loans, which may change the amount of interest income expected to be collected.
	•	Change in interest rate indices for variable rate loans - Expected future cash flows are based, as applicable, on the variable rates in effect at the time of the assessment of expected cash flows.
	A decrease in expected cash flows in subsequent periods may indicate that the loan is impaired which would likely require the recognition of a charge-off against the allowance for loan losses. An increase in expected cash flows in subsequent periods serves, first, to reduce any previously established allowance for loan losses by the increase in the present value of cash flows expected to be collected, and results in a recalculation of the amount of accretable yield for the loan. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans.
	A PCI loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the event of a sale of the loan, a gain or loss on sale would be recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. For PCI loans accounted for on an individual loan basis and resolved directly with the borrower, any amount received from resolution in excess of the carrying amount of the loan is recognized and reported within interest income.
	A refinancing or modification of a PCI loan accounted for individually is assessed to determine whether the modification represents a TDR. If the loan is considered to be a TDR, it will be included in the total impaired loans reported by the Company. The loan will continue to recognize interest income based upon the excess of cash flows expected to be collected over the carrying amount of the loan.
ALLOWANCE FOR LOAN LOSSES	The allowance for loan losses is established based upon the level of estimated probable losses in the current loan portfolio. Loan losses are charged against the allowance when management believes the collectability of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasizes loss factors derived from actual historical portfolio loss rates, which are combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Allowance amounts are determined based on an estimate of the historical average annual percentage rate of loan loss for each loan category, a temporal estimate of the incurred loss emergence and confirmation period for each loan category, and certain qualitative risk factors considered in the computation of the allowance for loan losses.
	The qualitative risk factors impacting the inherent risk of loss within the portfolio include the following:
	•	National and local economic and business conditions
	•	Level and trend of delinquencies
	•	Level and trend of charge-offs and recoveries
	•	Trends in volume and terms of loans
	•	Risk selection, lending policy and underwriting standards
	•	Experience and depth of management
	•	Banking industry conditions and other external factors
	•	Concentration risk
	The formula-based approach evaluates groups of loans with common characteristics, which consist of similar loan types with similar terms and conditions, to determine the appropriate allocation within each portfolio section. This approach incorporates qualitative adjustments based upon management’s assessment of various market and portfolio specific risk factors into its formula-based estimate. Due to the imprecise nature of the loan loss estimation process and ever changing conditions, the qualitative risk attributes may not adequately capture amounts of incurred loss in the formula-based loan loss components used to determine the Bank’s analysis of the adequacy of the allowance for loan losses.
	The Bank evaluates certain loans within the commercial and industrial, commercial real estate, commercial construction and small business portfolios individually for specific impairment. A loan is considered impaired when, based on current information and events, it is probable that 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, contractual interest rates 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. Loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification, troubled debt restructuring or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of the probable loss is able to be estimated. Estimates of loss may be determined by the present value of anticipated future cash flows, the loan’s observable fair market value, or the fair value of the collateral, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral less costs to sell is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible.
	Large groups of small-balance homogeneous loans such as the residential real estate, residential construction, home equity and other consumer portfolios are collectively evaluated for impairment. As such, the Bank does not typically identify individual loans within these groupings as impaired loans for impairment evaluation and disclosure. However, the Bank evaluates all TDRs for impairment on an individual loan basis regardless of loan type.
	In the ordinary course of business, the Bank enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The reserve for unfunded lending commitments is included in other liabilities in the balance sheet. At December 31, 2014 and 2013, the reserve for unfunded loan commitments was $813,000 and $716,000, respectively.
Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Financings, Policy [Policy Text Block]	Transfers and Servicing of Financial Assets
	Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
	Servicing assets are recognized as separate assets when rights are acquired through sale of loans with servicing rights retained. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income.
	Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan, and are recorded as income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income.
FEDERAL HOME LOAN BANK STOCK	Federal Home Loan Bank Stock
	The Company, as a member of the Federal Home Loan Bank (“FHLB”) of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if OTTI exists. The Company reviews recent public filings, rating agency analysis and other factors, when making its determination.
BANK PREMISES AND EQUIPMENT	Bank Premises and Equipment
	Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years.
GOODWILL AND IDENTIABLE INTANGIBLE ASSETS	Goodwill and Identifiable Intangible Assets
	Goodwill is the price paid which exceeds the net fair value of acquired businesses and is not amortized. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, the two step quantitative impairment test is performed. Step one of the quantitative impairment test compares book value to the fair value of the reporting unit. If test one is failed, a more detailed analysis is performed, which involves measuring the excess of the fair value of the reporting unit, as determined in step one, over the aggregate fair value of the individual assets, liabilities, and identifiable intangibles as if the reporting unit was being acquired in a business combination.
	Identifiable intangible assets subject to amortization consist of core deposit intangibles, noncompete agreements, customer lists, as well as a brand name, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. Identifiable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The range of useful lives is as follows:
	Core deposit intangibles	9-10 years
	Noncompete agreements	2-3 years
	Customer lists	10 years
	Brand name	5 years
	Leases	29 years
	The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets.
IMPAIRMENT OF LONG-LIVED ASSETS OTHER THAN GOODWILL	of Long-Lived Assets Other Than Goodwill
	The Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs undiscounted cash flow analysis to determine if impairment exists. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal.
CASH SURRENDER VALUE OF LIFE INSURANCE POLICIES	Cash Surrender Value of Life Insurance Policies
	Increases in the cash surrender value (“CSV”) of life insurance policies, as well as benefits received net of any CSV, are recorded in other noninterest income, and are not subject to income taxes. The CSV of the policies are recorded as assets of the Bank, with liabilities recognized for any split dollar arrangements associated with the policies. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. A life insurance policy with any individual carrier is limited to 15% of Tier 1 capital (as defined for regulatory purposes) and the total CSV of life insurance policies is limited to 25% of Tier 1 capital.
OTHER REAL ESTATE OWNED AND OTHER FORECLOSED ASSETS	Real estate properties and other assets, which have served as collateral to secure loans, are held for sale and are initially recorded at fair value less estimated costs to sell at the date control is established, resulting in a new cost basis. The amount by which the recorded investment in the loan exceeds the fair value (net of estimated costs to sell) of the foreclosed asset is charged to the allowance for loan losses. Subsequent declines in the fair value of the foreclosed asset below the new cost basis are recorded through the use of a valuation allowance. Subsequent increases in the fair value are recorded as reductions in the valuation allowance, but not below zero. Upon a sale of a foreclosed asset, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the foreclosed asset is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses and changes in the valuation allowance relating to foreclosed assets are included in other noninterest expense.
DERIVATIVES	Derivatives
	Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is determined by whether it has been designated and qualifies as part of a hedging relationship, and further, by the type of hedging relationship. At the inception of a hedge, the Company documents certain items, including but not limited to the following: the relationship between hedging instruments and hedged items, the Company risk management objectives, hedging strategies, and the evaluation of hedge transaction effectiveness. Documentation includes linking all derivatives designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions.
	For those derivative instruments that are designated and qualify as hedging instruments, the Company designates the hedging instrument, based upon the exposure being hedged, as either a fair value hedge or a cash flow hedge. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income, net of related tax, and reclassified into earnings in the same period or periods during which the hedged transactions affect earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item (i.e., the ineffective portion), if any, is recognized in current earnings during the period. For derivative instruments designated and qualifying as a fair value hedge (i.e., hedging the exposure to changes in the fair value of an asset or liability or an identified portion thereof that is attributable to the hedged risk), the gain or loss on the derivative instrument, as well as the offsetting gain or loss on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. Hedge accounting is discontinued prospectively when (1) a derivative is no longer highly effective in offsetting changes in the fair value or cash flow of a hedged item, (2) a derivative expires or is settled, (3) it is no longer likely that a forecasted transaction associated with the hedge will occur, or (4) it is determined that designation of a derivative as a hedge is no longer appropriate.
	To the extent the Company enters into new or re-designates existing hedging relationships, it is the Company's policy to include the Overnight Index Swap Rate in the spectrum of available benchmark interest rates for hedge accounting.
	For derivative instruments not designated as hedging instruments, such as loan level derivatives, foreign exchange contracts and mortgage derivatives, changes in fair value are recognized in other noninterest income during the period of change.
RETIREMENT PLANS	Retirement Plans
	The Company has various retirement plans in place for current and former employees, including postretirement benefit plans, supplemental executive retirement plans and frozen multiemployer pension plans.
	The postretirement benefit plans and the supplemental executive retirement plans are unfunded and therefore have no plan assets. The actuarial cost method used to compute the benefit liabilities and related expense is the projected unit credit method. The projected benefit obligation is principally determined based on the present value of the projected benefit distributions at an assumed discount rate. The discount rate which is utilized is based on the investment yield of high quality corporate bonds available in the market place with maturities approximately equal to projected cash flows of future benefit payments as of the measurement date. Periodic benefit expense (or income) includes service costs and interest costs based on the assumed discount rate, amortization of prior service costs due to plan amendments and amortization of actuarial gains and losses. The underfunded status of the plans is recorded as a liability on the balance sheet.
	The multiemployer pension plans assets are determined based on fair value, generally representing observable market prices. The actuarial cost method used to compute the pension liabilities and related expense is the unit credit method. The pension expense is equal to the plan contribution requirement of the Company for the plan year.
STOCK-BASED COMPENSATION	Stock-Based Compensation
	The Company recognizes stock-based compensation based on the grant-date fair value of the award adjusted for forfeitures. For restricted stock awards and units, the Company recognizes compensation expense ratably over the vesting period for the fair value of the award, measured at the grant date. For stock option awards, the Company values awards granted using the Black-Scholes option-pricing model. The Company recognizes compensation expense for these awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.
INCOME TAXES	Taxes
	Deferred income tax assets and liabilities are determined using the asset and liability (or balance sheet) method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current available information raises doubt as to the realization of the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income in the period that includes the enactment date. Income taxes are allocated to each entity in the consolidated group based on its share of taxable income. Management exercises significant judgment in evaluating the amount and timing of recognition of the resulting tax liabilities and assets, including projections of future taxable income. Additionally, a liability for unrecognized tax benefits is recorded for uncertain tax positions taken by the Company on its tax returns for which there is less than a 50% likelihood of being recognized upon a tax examination.
	Tax credits generated from the New Markets Tax Credit program are reflected in earnings when realized for federal income tax purposes.
Low Income Housing Tax Credits Policy Text Block [Policy Text Block]	Low Income Housing Tax Credits
	The Company accounts for its investments in qualified affordable housing projects using the proportional amortization method. Under the proportional amortization method the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits, received and recognizes the net investment performance as a component of income tax expense.
ASSETS UNDER ADMININSTRATION	Assets Under Administration
	Assets held in a fiduciary or agency capacity for customers are not included in the accompanying consolidated balance sheet, as such assets are not assets of the Company. Revenue from administrative and management activities associated with these assets is recorded on an accrual basis.
Extinguishment of Debt [Policy Text Block]	Extinguishment of Debt
	Upon extinguishment of an outstanding debt, the Company records the difference between the exit price and the net carrying amount of the debt as a gain or loss on the extinguishment. The gain or loss would be a component of other noninterest income or other noninterest expense, respectively.
EARNINGS PER SHARE	Basic earnings per share is calculated using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated from common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Under this method, all earnings distributed and undistributed, are allocated to participating securities and common shares based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities (i.e. unvested restricted stock), not subject to performance based measures. Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding (inclusive of participating securities). Diluted earnings per share have been calculated in a manner similar to that of basic earnings per share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if all potentially dilutive common shares (such as those resulting from the exercise of stock options or the attainment of performance measures) were issued during the period, computed using the treasury stock method.
COMPREHENSIVE INCOME	Comprehensive Income
	Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale, unrealized losses related to factors other than credit on debt securities, unrealized gains and losses on cash flow hedges, deferred gains on hedge accounting transactions, and changes in the funded status of the Company’s postretirement and supplemental retirement plans.
FAIR VALUE MEASUREMENTS	Fair Value Measurements
	In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial statements are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Standards
	FASB ASC Topic 805 "Business Combinations" Update No. 2014-17. Update No. 2014-17 was issued in November 2014 to provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. An acquired entity should determine whether to elect to apply pushdown accounting for each individual change-in-control event in which an acquirer obtains control of the acquired entity. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period to the acquired entity's most recent change-in-control event. An election to apply pushdown accounting in a reporting period in which the change-in-control event occurred should be considered a change in accounting principle in accordance with Topic 250, Accounting Changes and Error Corrections. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. The amendments in this Update are effective on November 18, 2014. The adoption of this standard did not have a material impact on the Company's consolidated financial position.
	FASB ASC Subtopic 205-40 "Presentation of Financial Statements - Going Concern" Update No. 2014-15. Update No. 2014-15 was issued in August 2014 to provide guidance in U.S. Generally accepted accounting principles ("GAAP") about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. In doing so, the amendments should reduce diversity in the timing and content of footnote disclosures. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
	FASB ASC Subtopic 310-40 "Receivables - Troubled Debt Restructurings by Creditors" Update No. 2014-14. Update No. 2014-14 was issued in August 2014 to address the diversity in practice related to how creditors classify government-guaranteed mortgage loans, including Federal Housing Administration (FHA) or the U.S. Department of Veterans Affairs (VA) guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The objective of this update is to reduce that diversity by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
	FASB ASC Topic 718 "Compensation - Stock Compensation" Update No. 2014 -12. Update No. 2014-12 was issued in June 2014 to resolve the diverse accounting treatment of share-based payment awards that require, as a condition to vesting, achievement of a specific performance target after the requisite service period. Many reporting entities account for these performance targets as performance conditions that affect the vesting of the award and, therefore, do not reflect the performance target in the estimate of the grant-date fair value of the award, while other reporting entities treat those performance targets as nonvesting conditions that affect the grant-date fair value of the award. This amendment requires that these performance targets that affect vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718 "Compensation - Stock Compensation" as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in this update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
	FASB ASC Topic 860 "Transfers and Servicing" Update No. 2014-11. Update No. 2014-11 was issued in June 2014 to respond to stakeholders' concerns about current accounting and disclosures for repurchase agreements and similar transactions.  The amendments in this Update require two accounting changes.  First, the amendments in this Update change the accounting for repurchase-to-maturity transactions to secured borrowing accounting.  Second, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement.  The amendments in this Update require disclosures for certain transactions comprising (1) a transfer of a financial asset accounted for as a sale and (2) an agreement with the same transferee entered into in contemplation of the initial transfer that results in the transferor retaining substantially all of the exposure to the economic return on the transferred financial asset throughout the term of the transaction. For those transactions outstanding at the reporting date, the transferor is required to disclose certain information by type of transaction.  The amendments in this Update also require certain disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The accounting changes in this Update are effective for public business entities for the first interim or annual period beginning after December 15, 2014. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Earlier application for a public business entity is prohibited. For public business entities, the disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The disclosures are not required to be presented for comparative periods before the effective date.  The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.
	FASB ASC Topic 606 "Revenue from Contracts with Customers" Update No. 2014-09. Update No. 2014-09 was issued in May 2014 to address the previous revenue recognition requirements in GAAP that differ from those in International Financial Reporting Standards (IFRS).  Accordingly, the Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) initiated a joint project to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For public entities, the standard is effective for annual and interim periods beginning after December 15, 2016, and calendar year-end public entities will apply it in the quarter that ends March 31, 2017.  Early adoption is not permitted.  We are currently assessing the potential impact of this amendment on our consolidated financial position.
	FASB ASC Subtopic 310-40 "Receivables - Troubled Debt Restructurings by Creditors" Update No. 2014-04. Update No. 2014-04 was issued in January 2014 to reduce diversity by clarifying when an in substance repossession of 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 amendments in this update clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in the update should be applied prospectively and are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's consolidated financial position.

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Asses Useful Lives	The range of useful lives is as follows:
	Core deposit intangibles	9-10 years
	Noncompete agreements	2-3 years
	Customer lists	10 years
	Brand name	5 years
	Leases	29 years

ACQUISITIONS_Tables

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition:
		Net Assets Acquired at Fair Value
		(Dollars in thousands)
	Assets
	Cash	$	12,683
	Investments	28,268
	Loans	450,671
	Premises and equipment	6,277
	Goodwill	22,544
	Core deposit intangible	2,150
	Other assets	37,309
	Total assets acquired	559,902
	Liabilities
	Deposits	357,434
	Borrowings	144,920
	Other liabilities	5,511
	Total liabilities assumed	507,865
	Purchase price	$	52,037
	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition:
		Net Assets Acquired at Fair Value
		(Dollars in thousands)
	Assets
	Cash	$	21,390
	Investments	77,953
	Loans	126,570
	Premises and equipment	7,128
	Goodwill	20,030
	Core deposit intangible	2,610
	Other assets	7,104
	Total assets acquired	262,785
	Liabilities
	Deposits	218,877
	Borrowings	1,121
	Other liabilities	2,527
	Total liabilities assumed	222,525
	Purchase price	$	40,260
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The following is a summary of these PCI loans associated with the acquisition as of the date acquired:
			(Dollars in thousands)
	Contractually required principal and interest at acquisition		$	47,548
	Contractual cash flows not expected to be collected		(8,733		)
	Expected cash flows at acquisition		38,815
	Interest component of expected cash flows		(3,095		)
	Basis in PCI loans at acquisition - estimated fair value		$	35,720
	The following tables display certain information pertaining to purchased credit impaired loans at the dates indicated:
			Mayflower Acquisition			Central Acquisition
			15-Nov-13			November 9, 2012
			(Dollars in thousands)
	Contractually required principal and interest payments receivable	-1	$	4,440		$	47,548
	Less: expected cash flows	-1	3,144			38,815
	Initial nonaccretable difference		$	1,296		$	8,733
	Expected cash flows	-1	$	3,144		$	38,815
	Less: fair value (initial carrying amount)		2,758			35,720
	Accretable Yield		$	386		$	3,095
	(1) Reflective of anticipated prepayments.
			31-Dec
			2014			2013
			(Dollars in thousands)
	Outstanding balance		$	25,279		$	33,555
	Carrying amount		$	22,315		$	29,544
Schedule of Pro Forma Results of Operations	The following summarizes the unaudited pro forma results of operations as if the Company acquired Mayflower on January 1, 2013 (2012 amounts represent combined results for the Company and Mayflower). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period.
		Years Ended December 31
		2013				2012
		(Dollars in thousands)
	Net interest income after provision for loan losses	$	178,556			$	162,781
	Net income	55,103				44,133
	The following summarizes the unaudited pro forma results of operations as if the Company acquired Central on January 1, 2012 (2011 amounts represent combined results for the Company and Central). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the periods presented, nor does it indicate future results for any other interim or full-year period.
		Years Ended December 31
		2012				2011
		(Dollars in thousands)
	Net interest income after provision for loan losses	$	165,860			$	170,514
	Net income	47,261				46,477

SECURITIES_Tables

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities and Held-to-maturity Securties	The following table presents a summary of the amortized cost, gross unrealized holding gains and losses, other-than-temporary impairment recorded in other comprehensive income and fair value of securities available for sale and securities held to maturity for the periods indicated:
		December 31, 2014													December 31, 2013
		Amortized			Gross			Gross Unrealized			Fair				Amortized			Gross		Gross Unrealized			Fair
		Cost			Unrealized			Losses			Value				Cost			Unrealized		Losses			Value
					Gains													Gains
		(Dollars in thousands)
	Available for sale securities
	U.S. government agency securities	$	41,369		$	139		$	(22	)	$	41,486			$	41,331		$	3	$	(885	)	$	40,449
	Agency mortgage-backed securities	211,168			7,203			(693		)	217,678				232,742			6,405		(4,556		)	234,591
	Agency collateralized mortgage obligations	63,059			599			(623		)	63,035				58,765			490		(1,102		)	58,153
	State, county, and municipal securities	5,106			117			—			5,223				5,439			1		(28		)	5,412
	Single issuer trust preferred securities issued by banks	2,913			12			(16		)	2,909				2,960			14		(22		)	2,952
	Pooled trust preferred securities issued by banks and insurers (1)	7,906			195			(1,780		)	6,321				8,083			—		(4,242		)	3,841
	Equity securities	11,572			567			(237		)	11,902				10,997			762		(295		)	11,464
	Total available for sale securities	$	343,093		$	8,832		$	(3,371	)	$	348,554			$	360,317		$	7,675	$	(11,130	)	$	356,862
	Held to maturity securities
	U.S. treasury securities	$	1,010		$	63		$	—		$	1,073			$	1,011		$	31	$	—		$	1,042
	Agency mortgage-backed securities	159,522			5,422			—			164,944				155,067			1,917		(1,033		)	155,951
	Agency collateralized mortgage obligations	207,995			2,141			(3,478		)	206,658				187,388			824		(6,176		)	182,036
	State, county, and municipal securities	424			4			—			428				678			7		—			685
	Single issuer trust preferred securities issued by banks	1,500			—			(23		)	1,477				1,503			23		—			1,526
	Corporate debt securities	5,002			117			—			5,119				5,005			210		—			5,215
	Total held to maturity securities	$	375,453		$	7,747		$	(3,501	)	$	379,699			$	350,652		$	3,012	$	(7,209	)	$	346,455
	Total	$	718,546		$	16,579		$	(6,872	)	$	728,253			$	710,969		$	10,687	$	(18,339	)	$	703,317
	-1	Gross unrealized gains and gross unrealized losses include $230,000 and $2.3 million of net non-credit related OTTI at December 31, 2014 and December 31, 2013, respectively.
Summary of Realized Gains and Losses on Available-for-sale Securities	When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The following table shows the gross realized gains and losses on available for sale securities for the periods indicated:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Gross realized gains on fixed income securities	$	121			$	258			$	5
	Gross realized losses on fixed income securities	(21		)		—				—
	Gain (loss) on equity investments	$	91			$	(28	)		$	111
	Net gains on investments	$	191			$	230			$	116
Schedule of Contractual Maturities of Securities	A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2014 is presented below:
		Available for Sale								Held to Maturity
		Amortized				Fair				Amortized				Fair
		Cost				Value				Cost				Value
		(Dollars in thousands)
	Due in one year or less	$	—			$	—			$	200			$	202
	Due after one year to five years	36,094				36,819				5,454				5,586
	Due after five to ten years	90,680				91,060				31,805				32,429
	Due after ten years	204,747				208,773				337,994				341,482
	Total debt securities	$	331,521			$	336,652			$	375,453			$	379,699
	Equity securities	$	11,572			$	11,902			$	—			$	—
	Total	$	343,093			$	348,554			$	375,453			$	379,699
Schedule of Gross Unrealized Losses and Fair Value of Investments
					31-Dec-14
					Less than 12 months								12 months or longer							Total
	Description of securities	# of			Fair Value				Unrealized				Fair				Unrealized			Fair Value				Unrealized
		holdings							Losses				Value				Losses							Losses
					(Dollars in thousands)
	U.S. government agency securities	22			$	21,950			$	(22	)		$	—			$	—		$	21,950			$	(22	)
	Agency mortgage-backed securities	17			3,471				(1		)		42,222				(692		)	45,693				(693		)
	Agency collateralized mortgage obligations	14			35,083				(331		)		94,974				(3,770		)	130,057				(4,101		)
	Single issuer trust preferred securities issued by banks and insurers	2			2,553				(39		)		—				—			2,553				(39		)
	Pooled trust preferred securities issued by banks and insurers	2			—				—				2,681				(1,356		)	2,681				(1,356		)
	Equity securities	23			1,480				(74		)		4,072				(163		)	5,552				(237		)
	Total temporarily impaired securities	80			$	64,537			$	(467	)		$	143,949			$	(5,981	)	$	208,486			$	(6,448	)
					31-Dec-13
					Less than 12 months								12 months or longer							Total
	Description of securities	# of			Fair Value				Unrealized				Fair				Unrealized			Fair Value				Unrealized
		holdings							Losses				Value				Losses							Losses
					(Dollars in thousands)
	U.S.government agency securities	39			$	39,950			$	(885	)		$	—			$	—		$	39,950			$	(885	)
	Agency mortgage-backed securities	124			202,004				(5,217		)		5,108				(372		)	207,112				(5,589		)
	Agency collateralized mortgage obligations	19			183,721				(7,278		)		—				—			183,721				(7,278		)
	State, county, and municipal securities	13			3,838				(28		)		—				—			3,838				(28		)
	Single issuer trust preferred securities issued by banks and insurers	2			1,341				(22		)		—				—			1,341				(22		)
	Pooled trust preferred securities issued by banks and insurers	2			—				—				2,300				(1,913		)	2,300				(1,913		)
	Equity securities	22			2,376				(90		)		3,520				(205		)	5,896				(295		)
	Total temporarily impaired securities	221			$	433,230			$	(13,520	)		$	10,928			$	(2,490	)	$	444,158			$	(16,010	)
Schedule of Other Than Temporary Impairment	The following table shows the total OTTI that the Company recorded for the periods indicated:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Gross change in OTTI recorded on certain investments	$	2,098			$	588			$	678
	Portion of OTTI recognized in OCI	(2,098		)		(588		)		(754		)
	Total credit related OTTI recognized in earnings	$	—			$	—			$	(76	)
Summary of Cumulative Credit Related Component of OTTI	The following table shows the cumulative credit related component of OTTI for the periods indicated:
		2014				2013				2012
		(Dollars in thousands)
	Balance at beginning of period	$	(9,997	)		$	(10,847	)		$	(10,771	)
	Add
	Incurred on securities not previously impaired	—				—				—
	Incurred on securities previously impaired	—				—				(76		)
	Less
	Securities sold during the period	—				850				—
	Reclassification due to changes in Company’s intent	—				—				—
	Increases in cash flow expected to be collected	—				—				—
	Balance at end of period	$	(9,997	)		$	(9,997	)		$	(10,847	)

LOANS_ALLOWANCE_FOR_LOAN_LOSSE1

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Tables)	12 Months Ended
	Dec. 31, 2014
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Schedule of Allowance for Loan Losses	The following table summarizes changes in the allowance for loan losses by loan category and bifurcates the amount of allowance allocated to each loan category based on collective impairment analysis and loans evaluated individually for impairment:
		31-Dec-14
		Commercial				Commercial				Commercial				Small				Residential				Home			Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Equity
		Industrial																Estate
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	15,622			$	24,541			$	3,371			$	1,215			$	2,760			$	5,036		$	694		$	53,239
	Charge-offs	(2,097		)		(5,454		)		—				(605		)		(826		)		(750		)	(1,215		)	(10,947		)
	Recoveries	462				404				—				275				424				249			591			2,405
	Provision	1,586				6,382				574				286				476				421			678			10,403
	Ending balance	$	15,573			$	25,873			$	3,945			$	1,171			$	2,834			$	4,956		$	748		$	55,100
	Ending balance: individually evaluated for impairment	$	412			$	197			$	—			$	7			$	1,500			$	262		$	38		$	2,416
	Ending balance: collectively evaluated for impairment	$	15,161			$	25,676			$	3,945			$	1,164			$	1,334			$	4,694		$	710		$	52,684
	Financing receivables ending balance:
	Individually evaluated for impairment	$	4,654			$	30,729			$	311			$	1,088			$	15,055			$	5,330		$	868		$	58,035
	Collectively evaluated for impairment	856,185				2,304,099				265,501				84,159				505,799				858,305			16,335			4,890,383
	Purchase credit impaired loans	—				12,495				182				—				9,405				228			5			22,315
	Total loans by group	$	860,839			$	2,347,323			$	265,994			$	85,247			$	530,259			$	863,863		$	17,208		$	4,970,733		-1
		31-Dec-13
		Commercial				Commercial				Commercial				Small				Residential				Home			Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Equity
		Industrial																Estate
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	13,461			$	22,598			$	2,811			$	1,524			$	2,930			$	7,703		$	807		$	51,834
	Charge-offs	(2,683		)		(3,587		)		(308		)		(773		)		(622		)		(1,370		)	(1,175		)	(10,518		)
	Recoveries	272				206				100				279				143				135			588			1,723
	Provision	$	4,572			$	5,324			$	768			$	185			$	309			$	(1,432	)	$	474		$	10,200
	Ending balance	$	15,622			$	24,541			$	3,371			$	1,215			$	2,760			$	5,036		$	694		$	53,239
	Ending balance: individually evaluated for impairment	$	1,150			$	765			$	—			$	109			$	1,564			$	116		$	70		$	3,774
	Ending balance: collectively evaluated for impairment	$	14,472			$	23,776			$	3,371			$	1,106			$	1,196			$	4,920		$	624		$	49,465
	Financing receivables ending balance:
	Individually evaluated for impairment	$	9,148			$	39,516			$	100			$	1,903			$	15,200			$	4,890		$	1,298		$	72,055
	Collectively evaluated for impairment	775,053				2,191,132				223,562				75,337				515,854				816,925			18,845			4,616,708
	Purchase credit impaired loans	1				18,612				197				—				10,389				326			19			29,544
	Total loans by group	$	784,202			$	2,249,260			$	223,859			$	77,240			$	541,443			$	822,141		$	20,162		$	4,718,307		-1
		31-Dec-12
		Commercial				Commercial				Commercial				Small				Residential							Other Consumer			Total
		and				Real Estate				Construction				Business				Real				Home
		Industrial																Estate				Equity
		(Dollars in thousands)
	Allowance for loan losses
	Beginning balance	$	11,682			$	23,514			$	2,076			$	1,896			$	3,113			$	4,597		$	1,382		$	48,260
	Charge-offs	(6,191		)		(4,348		)		—				(616		)		(1,094		)		(3,178		)	(1,165		)	(16,592		)
	Recoveries	963				188				—				134				151				93			581			2,110
	Provision	7,007				3,244				735				110				760				6,191			9			18,056
	Ending balance	$	13,461			$	22,598			$	2,811			$	1,524			$	2,930			$	7,703		$	807		$	51,834
	Ending balance: individually evaluated for impairment	$	1,084			$	516			$	—			$	353			$	1,302			$	35		$	130		$	3,420
	Ending balance: collectively evaluated for impairment	$	12,377			$	22,082			$	2,811			$	1,171			$	1,628			$	7,668		$	677		$	48,414
	Financing receivables ending balance:
	Individually evaluated for impairment	$	8,575			$	33,868			$	—			$	2,279			$	15,373			$	4,435		$	2,129		$	66,659
	Collectively evaluated for impairment	678,936				2,066,432				188,768				76,315				587,687				797,334			24,826			4,420,298
	Purchase credit impaired loans	—				21,853				—				—				9,821				380			—			32,054
	Total loans by group	$	687,511			$	2,122,153			$	188,768			$	78,594			$	612,881			$	802,149		$	26,955		$	4,519,011		-1
	-1	The amount of net deferred fees included in the ending balance was $2.8 million, $2.3 million, and $3.1 million at December 31, 2014, 2013, and 2012, respectively.
Schedule of Internal Risk-Rating Categories for the Company's Commercial Portfolio	The following table details the internal risk-rating categories for the Company’s commercial portfolio:
				31-Dec-14
	Category	Risk		Commercial and				Commercial Real				Commercial				Small Business				Total
		Rating		Industrial				Estate				Construction
				(Dollars in thousands)
	Pass	1 - 6		$	801,578			$	2,196,109			$	248,696			$	81,255			$	3,327,638
	Potential weakness	7		37,802				82,372				15,464				2,932				138,570
	Definite weakness	8		20,241				67,571				1,834				949				90,595
	Partial loss probable	9		1,218				1,271				—				111				2,600
	Definite loss	10		—				—				—				—				—
	Total			$	860,839			$	2,347,323			$	265,994			$	85,247			$	3,559,403
				31-Dec-13
	Category	Risk		Commercial and				Commercial Real				Commercial				Small Business				Total
		Rating		Industrial				Estate				Construction
				(Dollars in thousands)
	Pass	1 - 6		$	736,996			$	2,068,995			$	210,372			$	71,514			$	3,087,877
	Potential weakness	7		21,841				91,984				8,608				3,031				125,464
	Definite weakness	8		24,409				85,767				4,779				2,552				117,507
	Partial loss probable	9		956				2,514				100				143				3,713
	Definite loss	10		—				—				—				—				—
	Total			$	784,202			$	2,249,260			$	223,859			$	77,240			$	3,334,561
Schedule of Weighted Average FICO Scores and Weighted Average Combined LTV Ratio
		31-Dec
		2014			2013
	Residential portfolio
	FICO score (re-scored)(1)	739			738
	LTV (re-valued)(2)	67.1	%		67	%
	Home equity portfolio
	FICO score (re-scored)(1)	764			763
	LTV (re-valued)(2)	53.6	%		53	%
	-1	The average FICO scores above are based upon rescores available from November and origination score data for loans booked between December 1 and December 31, for the years indicated.
	-2	The combined LTV ratios for December 31, 2014 and 2013 are based upon updated automated valuations as of February 28, 2013 and actual score data for loans booked from March 1, 2013 through December 31, 2014.
Schedule of Nonaccrual Loans	The following table shows nonaccrual loans at the dates indicated:
		31-Dec
		2014				2013
		(Dollars in thousands)
	Commercial and industrial	$	2,822			$	4,178
	Commercial real estate	7,279				11,734
	Commercial construction	311				100
	Small business	246				633
	Residential real estate	8,697				10,329
	Home equity	8,038				7,068
	Other consumer	—				92
	Total nonaccrual loans(1)	$	27,393			$	34,134
	-1	Included in these amounts were $5.2 million and $7.5 million nonaccruing TDRs at December 31, 2014 and 2013, respectively.
Schedule of the Age Analysis of Past Due Financing Receivables	The following table shows the age analysis of past due financing receivables as of the dates indicated:
		31-Dec-14
		30-59 days							60-89 days							90 days or more							Total Past Due					Current				Total		Recorded
																																Financing		Investment
																																Receivables		>90 Days
		Number			Principal				Number			Principal				Number			Principal				Number		Principal									and Accruing
		of Loans			Balance				of Loans			Balance				of Loans			Balance				of Loans		Balance
		(Dollars in thousands)
	Commercial and industrial	18			$	3,192			10			$	1,007			19			$	2,320			47		$	6,519		$	854,320			$	860,839	$	—
	Commercial real estate	19			13,428				6			1,480				16			4,225				41		19,133			2,328,190				2,347,323		—
	Commercial construction	1			506				—			—				1			311				2		817			265,177				265,994		—
	Small business	7			21				8			113				7			173				22		307			84,940				85,247		—
	Residential real estate	13			1,670				10			1,798				36			4,826				59		8,294			521,965				530,259		106
	Home equity	20			1,559				7			307				23			2,402				50		4,268			859,595				863,863		—
	Other consumer	34			233				6			20				8			13				48		266			16,942				17,208		13
	Total	112			$	20,609			47			$	4,725			110			$	14,270			269		$	39,604		$	4,931,129			$	4,970,733	$	119
		31-Dec-13
		30-59 days							60-89 days							90 days or more							Total Past Due					Current				Total		Recorded
																																Financing		Investment
																																Receivables		>90 Days
		Number			Principal				Number			Principal				Number			Principal				Number		Principal									and Accruing
		of Loans			Balance				of Loans			Balance				of Loans			Balance				of Loans		Balance
		(Dollars in thousands)
	Commercial and industrial	9			$	743			6			$	327			20			$	3,763			35		$	4,833		$	779,369			$	784,202	$	—
	Commercial real estate	21			8,643				2			356				30			8,155				53		17,154			2,232,106				2,249,260		—
	Commercial construction	1			847				—			—				1			100				2		947			222,912				223,859		—
	Small business	18			353				6			227				14			247				38		827			76,413				77,240		—
	Residential real estate	23			2,903				8			1,630				39			6,648				70		11,181			530,262				541,443		462
	Home equity	27			1,922				8			852				23			2,055				58		4,829			817,312				822,141		—
	Other consumer	110			514				30			106				34			148				174		768			19,394				20,162		63
	Total	209			$	15,925			60			$	3,498			161			$	21,116			430		$	40,539		$	4,677,768			$	4,718,307	$	525
Schedule of Troubled Debt Restructuring and Other Pertinent Information
		31-Dec
		2014				2013
		(Dollars in thousands)
	TDRs on accrual status	$	38,382			$	38,410
	TDRs on nonaccrual status	5,248				7,454
	Total TDRs	$	43,630			$	45,864
	Amount of specific reserves included in the allowance for loan loss associated with TDRs:	$	2,004			$	2,474
	Additional commitments to lend to a borrower who has been a party to a TDR:	$	1,400			$	1,877
Schedule of Troubled Debt Restructuring Modifications
		Years Ended December 31
		2014
		Number			Pre-Modification				Post-Modification
		of Contracts			Outstanding Recorded				Outstanding Recorded
					Investment				Investment(1)
		(Dollars in thousands)
	Commercial & industrial	12			$	681			$	681
	Commercial real estate	13			4,329				4,329
	Small business	5			133				133
	Residential real estate	9			1,535				1,568
	Home equity	11			923				926
	Other consumer	1			8				8
	Total	51			$	7,609			$	7,645
		2013
	Commercial & industrial	11			$	732			$	732
	Commercial real estate	9			8,100				8,100
	Small business	12			556				556
	Residential real estate	9			2,401				2,427
	Home equity	17			1,347				1,347
	Other consumer	9			27				27
	Total	67			$	13,163			$	13,189
		2012
	Commercial & industrial	18			$	3,372			$	3,372
	Commercial real estate	15			7,121				7,121
	Small business	14			621				621
	Residential real estate	20			3,495				3,499
	Home equity	20			1,195				1,198
	Other consumer	33			328				329
	Total	120			$	16,132			$	16,140
	-1	The post-modification balances represent the balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.
Schedule of Post-Modification Balance of Troubled Debt Restructuring by Type of Modification	The following table shows the Company’s post-modification balance of TDRs listed by type of modification as of the periods indicated:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Extended maturity	$	3,441			$	3,582			$	5,867
	Adjusted interest rate	727				—				2,182
	Combination rate & maturity	2,640				8,917				5,007
	Court ordered concession	837				690				3,084
	Total	$	7,645			$	13,189			$	16,140
Schedule of Troubled Debt Restructurings Which Have Subsequently Defaulted	The following table shows the loans that have been modified during the past twelve months which have subsequently defaulted during the periods indicated:
		Years Ended December 31
		2014							2013							2012
		Number			Recorded				Number			Recorded				Number			Recorded
		of Contracts			Investment				of Contracts			Investment				of Contracts			Investment
		(Dollars in thousands)
	Troubled debt restructurings that subsequently defaulted
	Commercial & industrial	2			$	196			—			$	—			1			$	231
	Commercial real estate	—			—				1			176				3			696
	Residential real estate	3			214				—			—				1			238
	Other consumer	—			—				1			1				—			—
	Total	5			$	410			2			$	177			5			$	1,165
Schedule of Impaired Loans by Loan Portfolio	The table below sets forth information regarding the Company’s impaired loans as of the dates indicated:
		Years Ended December 31
		2014
		Recorded				Unpaid				Related				Average				Interest Income Recognized
		Investment				Principal				Allowance				Recorded
						Balance								Investment
		(Dollars in thousands)
	With no related allowance recorded
	Commercial & industrial	$	3,005			$	3,278			$	—			$	4,557			$	258
	Commercial real estate	15,982				17,164				—				16,703				1,025
	Commercial construction	311				311				—				311				13
	Small business	692				718				—				772				45
	Residential real estate	2,439				2,502				—				2,493				102
	Home equity	4,169				4,221				—				4,264				198
	Other consumer	338				341				—				364				24
	Subtotal	26,936				28,535				—				29,464				1,665
	With an allowance recorded
	Commercial & industrial	$	1,649			$	1,859			$	412			$	2,032			$	98
	Commercial real estate	14,747				15,514				197				15,650				842
	Commercial construction	—				—				—				—				—
	Small business	396				458				7				456				32
	Residential real estate	12,616				13,727				1,500				12,817				537
	Home equity	1,161				1,264				262				1,203				46
	Other consumer	530				530				38				580				22
	Subtotal	31,099				33,352				2,416				32,738				1,577
	Total	$	58,035			$	61,887			$	2,416			$	62,202			$	3,242
		2013
		Recorded				Unpaid				Related				Average				Interest
		Investment				Principal				Allowance				Recorded				Income
						Balance								Investment				Recognized
		(Dollars in thousands)
	With no related allowance recorded
	Commercial & industrial	$	7,147			$	7,288			$	—			$	7,338			$	338
	Commercial real estate	14,283				15,891				—				15,728				1,075
	Commercial construction	100				408				—				1,105				43
	Small business	1,474				1,805				—				1,854				121
	Residential real estate	1,972				2,026				—				2,021				95
	Home equity	4,263				4,322				—				4,335				202
	Other consumer	446				446				—				515				41
	Subtotal	29,685				32,186				—				32,896				1,915
	With an allowance recorded
	Commercial & industrial	$	2,001			$	2,045			$	1,150			$	2,572			$	125
	Commercial real estate	25,233				25,377				765				25,595				1,326
	Commercial construction	—				—				—				—				—
	Small business	429				462				109				459				28
	Residential real estate	13,228				14,197				1,564				13,405				515
	Home equity	627				694				116				642				26
	Other consumer	852				856				70				954				33
	Subtotal	42,370				43,631				3,774				43,627				2,053
	Total	$	72,055			$	75,817			$	3,774			$	76,523			$	3,968
		2012
		Recorded				Unpaid				Related				Average				Interest
		Investment				Principal				Allowance				Recorded				Income
						Balance								Investment				Recognized
		(Dollars in thousands)
	With no related allowance recorded
	Commercial & industrial	$	5,849			$	7,343			$	—			$	6,993			$	391
	Commercial real estate	12,999				13,698				—				13,984				952
	Commercial construction	—				—				—				—				—
	Small business	1,085				1,147				—				1,217				80
	Residential real estate	2,545				2,630				—				2,589				118
	Home equity	4,119				4,166				—				4,190				195
	Other consumer	700				705				—				858				72
	Subtotal	27,297				29,689				—				29,831				1,808
With an allowance recorded
Commercial & industrial	$	2,726			$	2,851			$	1,084			$	2,883			$	143
Commercial real estate	20,869				21,438				516				21,678				1,340
Commercial construction	—				—				—				—				—
Small business	1,194				1,228				353				1,255				77
Residential real estate	12,828				13,601				1,302				13,014				560
Home equity	316				389				35				324				23
Other consumer	1,429				1,453				130				1,610				60
Subtotal	39,362				40,960				3,420				40,764				2,203
Total	$	66,659			$	70,649			$	3,420			$	70,595			$	4,011
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The following is a summary of these PCI loans associated with the acquisition as of the date acquired:
			(Dollars in thousands)
	Contractually required principal and interest at acquisition		$	47,548
	Contractual cash flows not expected to be collected		(8,733		)
	Expected cash flows at acquisition		38,815
	Interest component of expected cash flows		(3,095		)
	Basis in PCI loans at acquisition - estimated fair value		$	35,720
	The following tables display certain information pertaining to purchased credit impaired loans at the dates indicated:
			Mayflower Acquisition			Central Acquisition
			15-Nov-13			November 9, 2012
			(Dollars in thousands)
	Contractually required principal and interest payments receivable	-1	$	4,440		$	47,548
	Less: expected cash flows	-1	3,144			38,815
	Initial nonaccretable difference		$	1,296		$	8,733
	Expected cash flows	-1	$	3,144		$	38,815
	Less: fair value (initial carrying amount)		2,758			35,720
	Accretable Yield		$	386		$	3,095
	(1) Reflective of anticipated prepayments.
			31-Dec
			2014			2013
			(Dollars in thousands)
	Outstanding balance		$	25,279		$	33,555
	Carrying amount		$	22,315		$	29,544
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Table Text Block]	The following table summarizes activity in the accretable yield for the PCI loan portfolio:
			2014				2013
			(Dollars in thousands)
	Beginning balance		$	2,514			$	2,464
	Acquisition		—				386
	Accretion		(2,299		)		(1,812		)
	Other change in expected cash flows (1)		2,565				1,142
	Reclassification from nonaccretable difference for loans which have paid off (2)		194				334
	Ending balance		$	2,974			$	2,514
	-1	Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).
	-2	Results in increased income during the period when a loan pays off at amount greater than originally expected.
Schedule of Loans to Insiders	Annual activity consists of the following at the periods indicated:
		2014				2013
		(Dollars in thousands)
	Principal balance of loans outstanding at beginning of year	$	52,510			$	47,859
	Loan advances	21,310				107,461
	Loan payments/payoffs	(21,913		)		(102,810		)
	Reduction for former directors (1)	(25,913		)		—
	Principal balance of loans outstanding at end of year	$	25,994			$	52,510
	(1) Amounts relate to loans to individuals who are no longer current directors of the Company and therefore are not deemed to be an insider.

BANK_PREMISES_AND_EQUIPMENT_Ta

BANK PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Bank premises and equipment at December 31, were as follows:
		2014			2013			Estimated
								Useful Life
		(Dollars in thousands)						(In years)
	Cost:
	Land	$	15,786		$	16,026		n/a
	Bank premises	33,425			32,858			May-39
	Leasehold improvements	20,797			20,189			15-Jan
	Furniture and equipment	49,894			46,613			10-Jan
	Total cost	119,902			115,686
	Accumulated depreciation	(55,828		)	(50,736		)
	Net bank premises and equipment	$	64,074		$	64,950

GOODWILL_AND_IDENTIFIABLE_INTA1

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:
		2014		2013
		(Dollars in thousands)
	Balances not subject to amortization:
	Goodwill	$	170,421	$	170,421
	Balances subject to amortization:
	Core deposit intangibles	9,269		11,218
	Other identifiable intangible assets	616		1,003
	Total other intangible assets	9,885		12,221
	Total goodwill and other intangible assets	$	180,306	$	182,642
Schedule of Goodwill	The changes in the carrying value of goodwill for the periods indicated were as follows:
		2014		2013			2012
		(Dollars in thousands)
	Balance at beginning of year	$	170,421	$	150,391		$	130,074
	Acquisitions	—		20,030			22,544
	Impairment (1)	—		—			(2,227		)
	Balance at end of year	$	170,421	$	170,421		$	150,391
	-1	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.
Schedule of Other Intangible Assets	The gross carrying amount and accumulated amortization of other intangible assets were as follows at the periods indicated:
		2014								2013
		Gross		Accumulated			Net			Gross		Accumulated			Net
		Carrying		Amortization			Carrying			Carrying		Amortization			Carrying
		Amount					Amount			Amount					Amount
		(Dollars in thousands)
	Core deposit intangibles	$	20,147	$	(10,878	)	$	9,269		$	20,147	$	(8,929	)	$	11,218
	Other intangible assets	1,940		(1,324		)	616			1,940		(937		)	1,003
	Total	$	22,087	$	(12,202	)	$	9,885		$	22,087	$	(9,866	)	$	12,221
Schedule of Intangible Assets Estimated Annual Amortization Expense	The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:
	Year	Amount
		(Dollars in thousands)
	2015	$	2,175
	2016	2,082
	2017	2,061
	2018	1,315
	2019	704

DEPOSITS_Tables

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Schedule of Time Deposits Maturities	The following is a summary of the scheduled maturities of time deposits as of December 31:
		2014				2013
		(Dollars in thousands)
	1 year or less	$	462,506	71.2	%	$	559,402	75.1	%
	Over 1 year to 2 years	102,385		15.8	%	87,645		11.8	%
	Over 2 years to 3 years	29,044		4.5	%	51,778		7	%
	Over 3 years to 4 years	26,156		4	%	20,462		2.8	%
	Over 4 years to 5 years	29,529		4.5	%	24,288		3.3	%
	Over 5 years	—		—	%	53		—	%
	Total	$	649,620	100	%	$	743,628	100	%

BORROWINGS_Tables

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Federal Home Loan Bank Borrowings	Advances payable to the Federal Home Loan Bank are summarized as follows:
			2014					2013
						Weighted					Weighted
						Average					Average
			Total			Contractual		Total			Contractual
			Outstanding			Rate		Outstanding			Rate
			(Dollars in thousands)
	Stated Maturity
	2014		$	—		—	%	$	105,027		0.55	%
	2015		38,001			0.69	%	3,074			5.81	%
	2016		—			—	%	—			—	%
	2017		31,203			4.03	%	31,290			4.02	%
	2018		—			—	%	—			—	%
	2019		—			—	%	—			—	%
	Subtotal		$	69,204		2.2	%	$	139,391		1.44	%
	Amortizing advances		876					903
	Total Federal Home Loan Bank Advances		$	70,080				$	140,294
Schedule of Short-term Borrowings	The Company’s short-term borrowings consisted of the following as of the periods indicated:
		31-Dec
		2014			2013
		(Dollars in thousands)
	Customer repurchase agreements	$	147,890		$	149,288
	Line of credit advances	—			5,000
	Total short-term borrowings	$	147,890		$	154,288
Schedule of Additional Information on Short-term Borrowings	The table below sets forth additional information on certain short-term borrowing categories as of and for the periods indicated:
			2014					2013						2012
						Weighted					Weighted							Weighted
						Average					Average							Average
						Interest					Interest							Interest
			Amount			Rate		Amount			Rate			Amount				Rate
	Customer Repurchase Agreements		(Dollars in thousands)
	Balance outstanding at end of year		$	147,890		0.13	%	$	149,288		0.13	%		$	153,359			0.13	%
	Average daily balance outstanding		143,700			0.13	%	147,195			0.13	%		160,589				0.2	%
	Maximum balance outstanding at any month end		160,317			N/A		164,180			N/A			178,171				N/A
Schedule of Long-term Borrowings	The following table summarizes long-term debt as of the periods indicated:
		31-Dec
		2014			2013
		(Dollars in thousands)
	Wholesale repurchase agreements	$	50,000		$	50,000
	Junior subordinated debentures
	Capital Trust V	51,547			51,547
	Slades Ferry Trust I	10,310			10,310
	Central Trust I	5,258			5,258
	Central Trust II	6,570			6,791
	Subordinated debentures	65,000			30,000
	Total long-term debt	$	188,685		$	153,906
Information relating to Trust Preferred Securities [Table Text Block]	Information relating to these trust preferred securities are as follows:
	Trust		Description of Capital Securities
	Capital Trust V		$50.0 million due in 2037, interest at a variable rate (LIBOR plus 1.48%), which has been effectively converted to a fixed rate of 6.52% until December 28, 2016, through the use of an interest rate swap. These securities are callable quarterly, until maturity.
	Slades Ferry Trust I		$10.0 million due in 2034, bearing interest at a variable rate (LIBOR plus 2.79%). These securities are callable quarterly, until maturity.
	Central Trust I		$5.1 million due in 2034, bearing interest at a variable rate (LIBOR plus 2.44%). These securities are callable quarterly, until maturity.
	Central Trust II		$5.9 million due in 2037, bearing a fixed interest rate 7.015% until March 15, 2017. Subsequent to this date, the interest will be variable (LIBOR plus 1.65%) and the securities will become callable quarterly, until maturity.
Schedule of Maturities of Borrowings	The following table sets forth the contractual maturities of long-term debt over the next five years:
			2015			2016			2017			2018				2019				Thereafter		Total
			(Dollars in thousands)
	Wholesale repurchase agreements		$	50,000		$	—		$	—		$	—			$	—			$	—	$	50,000
	Junior subordinated debentures
	Capital trust V		—			—			—			—				—				51,547		51,547
	Slades ferry trust I		—			—			—			—				—				10,310		10,310
	Central trust I		—			—			—			—				—				5,258		5,258
	Central trust II		—			—			—			—				—				6,570		6,570
	Subordinated debentures		—			—			—			—				30,000				35,000		65,000

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of the Components of Earnings Per Share	Earnings per share consisted of the following components for the years ended December 31:
		2014				2013			2012
		(Dollars in thousands)
	Net income	$	59,845			$	50,254		$	42,627
		Weighted Average Shares
	Basic shares	23,899,562				23,011,814			21,782,499
	Effect of dilutive securities	93,815				76,764			29,817
	Diluted shares	23,993,377				23,088,578			21,812,316
	Net income per share
	Basic EPS	$	2.5			$	2.18		$	1.96
	Effect of dilutive securities	(0.01		)		—			(0.01		)
	Diluted EPS	$	2.49			$	2.18		$	1.95
Schedule of Options to Purchase Common Stock Excluded From Diluted Earnings Per Share	The following table illustrates the options to purchase common stock and the shares of performance-based restricted stock that were excluded from the calculation of diluted earnings per share because they were anti-dilutive:
		31-Dec
		2014			2013			2012
	Stock options	—			124,608			584,938
	Performance-based restricted stock	—			—			—

STOCK_BASED_COMPENSATION_Table

STOCK BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Cumulatively Granted Stock Options and Restricted Stock Awards, Net of Forfeitures	The following table presents the amount of cumulatively granted stock options and restricted stock awards, net of forfeitures, through December 31, 2014:
			Authorized			Authorized		Total		Cumulative Granted, Net of					Total		Authorized
			Stock			Restricted				Forfeitures							but
			Option Awards			Stock Awards				Stock			Restricted				Unissued
										Option  Awards			Stock  Awards
		1996 Plan	300,000			N/A		300,000		190,000			N/A		190,000		-4
		1997 Plan	1,100,000			N/A		1,100,000		972,271			N/A		972,271		-4
		2005 Plan	-1			-1		1,650,000		537,941			551,043		1,088,984		561,016
		2006 Plan	-2			-2		35,400		15,000			20,400		35,400		-4
		2010 Plan	-3			-3		314,600		27,000			67,220		94,220		220,380
	-1	The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
	-2	The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
	-3	The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.
	-4	There are no shares available for grant under the 1996 Plan or 1997 Plan due to their expirations. These Plans have outstanding stock options exercisable despite the Plan expiration. Additionally, the 2006 Plan has outstanding stock options exercisable despite the transfer of remaining authorized shares to the 2010 Plan.
Schedule of Pre-tax Compensation Expense and Related Tax Benefits	The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the years presented:
		Years Ended December 31
		2014				2013			2012
		(Dollars in thousands)
	Stock based compensation expense
	Stock options	$	36			$	241		$	526
	Restricted stock awards(1)	2,135				1,906			1,968
	Directors’ fee expense
	Stock options	14				27			19
	Restricted stock awards	527				288			332
	Total stock based award expense	$	2,712			$	2,462		$	2,845
	Related tax benefits recognized in earnings	$	945			$	832		$	932
	-1	Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.
Schedule of Stock Options Granted	he Company made the following awards of nonqualified options to purchase shares of common stock in 2013. There were no such awards made in 2014 or 2012.
		Year Ended December 31
		2013
	Date of grant	11/9/13
	Plan	2010
	Options granted	5,000
	Vesting period (1)	13 months
	Expiration date	11/9/23
	Expected volatility	31.23		%
	Expected life (years)	5.5
	Expected dividend yield	2.64		%
	Risk free interest rate	1.56		%
	Fair value per option	$	8.13
	-1	Vesting periods begin on the grant date unless otherwise noted.
Schedule of Relevant Information Relating to Stock Options	The following table presents relevant information relating to the Company’s stock options for the periods indicated:
		Years Ended December 31
		2014				2013			2012
		(Dollars in thousands)
	Fair value of stock options vested based on grant date fair value	$	211			$	430		$	706
	Intrinsic value of stock options exercised	1,210				1,051			609
	Cash received from stock option exercises	6,285				2,475			1,242
	Tax benefit realized on stock option exercises/repurchase	442				322			242
	Weighted average grant date fair value of options granted (per share)	—				8.13			—
	Cash paid to settle equity instruments granted under stock based compensation arrangements	—				—			134
Schedule of Stock Options	A summary of the status of the Company’s Stock Option Grants for the year ended December 31, 2014 is presented in the table below:
		Outstanding												Nonvested
		Stock Option				Weighted			Weighted		Aggregate			Stock			Weighted
		Awards				Average			Average		Intrinsic			Option			Average
						Exercise			Remaining		Value (1)			Awards			Grant Date
						Price			Contractual								Fair Value
									Term (years)
		(Dollars in thousands, except per share data)
	Balance at January 1, 2014	524,948				$	30.5							33,487			$	6.71
	Granted	—				—								—			—
	Exercised	(193,697	)			32.45								n/a			n/a
	Vested	n/a				n/a								(31,821	)		6.64
	Forfeited	—				—								—			—
	Expired	(500	)			31.44								—			—
	Balance at December 31, 2014	330,751		-2		$	29.36		3.65		$	4,548		1,666		-4	$	8.13
	Options outstanding and expected to vest at December 31, 2014	330,750		-2		$	29.36		3.65		$	4,548
	Options exercisable at December 31, 2014	329,085		-3		$	29.33		3.63		$	4,535
	Unrecognized compensation cost, including forfeiture estimate																		$	—
	Weighted average remaining recognition period (years)																		0.01
	-1	The aggregate intrinsic value in the preceding tables represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2014 of $43.11 which would have been received by the option holders had they all exercised their options as of that date.
	-2	Inclusive of 28,999 stock options outstanding and expected to vest to Directors.
	-3	Inclusive of 27,334 vested stock options outstanding to Directors.
	-4	Inclusive of 1,666 nonvested stock options outstanding to Directors.
Schedule of Restricted Stock Granted	The Company grants both time-vested restricted stock awards as well as performance-based restricted stock awards. During the years ended December 31, 2014, 2013, and 2012 the Company has made the following restricted stock award grants:
		Shares Granted			Plan		Fair Value (1)			Vesting Period
	Time-vested
	2014
	3/20/14	65,950			2005		$	39.82		Ratably over 5 years from grant date
	3/31/14	3,000			2005		39			Ratably over 3 years from grant date
	5/20/14	10,920			2010		35.08			At the end of 5 years from grant date(2)
	11/20/14	2,000			2005		39.11			Ratably over 5 years from grant date
	12/11/14	2,000			2005		$	40.89		Ratably over 5 years from grant date
	2013
	1/16/13	2,000			2005		30.48			Ratably over 3 years from grant date
	2/14/13	93,800			2005		31.51			Ratably over 5 years from grant date
	5/21/13	14,700			2010		33.17			At the end of 5 years from grant date(2)
	2012
	2/16/12	89,800			2005		$	27.81		Ratably over 5 years from grant date
	4/5/12	1,000			2005		28.16			Ratably over 5 years from grant date
	5/22/12	1,000			2010		27.63			Immediate upon grant
	5/22/12	13,000			2010		27.63			At the end of 5 years from grant date(2)
	11/10/12	1,000			2010		28.03			At the end of 5 years from grant date(2)
	Performance-based
	2014
	3/20/14	20,700			2005		$	39.82		On March 20, 2017, if performance conditions are met
	-1	The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.
	-2	These restricted stock grants will vest at the end of a five year period, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement. If a non-employee director is removed from the Board for cause, the Company has ninety (90) days within which to exercise a right to repurchase any unvested portion of any restricted stock award from the non-employee director for the aggregate price of one dollar ($1.00).
Schedule of Fair Value of Restricted Stock Awards Vesting	The following table presents the fair value of restricted stock awards vesting during the periods presented:
		Years Ended December 31
		2014				2013			2012
		(Dollars in thousands)
	Fair value of restricted stock awards upon vesting	$	3,293			$	3,289		$	2,085
Schedule of Restricted Stock Awards	A summary of the status of the Company’s Restricted Stock Award Grants for the year ended December 31, 2014 is presented in the table below:
		Outstanding Restricted Stock				Weighted Average
		Awards				Grant Price ($)
		(Dollars in thousands, except per share data)
	Balance at January 1, 2014	271,927				$	28.39
	Granted	104,570				39.31
	Vested/released	(91,507	)			26.3
	Forfeited	(8,463	)			30.21
	Balance at December 31, 2014	276,527		-1		$	33.15
	Unrecognized compensation cost (inclusive of directors’ fees), including forfeiture estimate								$	6,644
	Weighted average remaining recognition period (years)								3.15
	-1	Inclusive of 34,600 restricted stock awards outstanding to Directors.

DERIVATIVES_AND_HEDGING_ACTIVI1

DERIVATIVES AND HEDGING ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes	The following table reflects the Company’s derivative positions for the periods indicated below for interest rate swaps which qualify as cash flow hedges for accounting purposes:
	31-Dec-14
	Notional				Trade		Effective		Maturity		Receive		Current			Pay Fixed			Fair Value
	Amount				Date		Date		Date		(Variable)		Rate			Swap Rate
											Index		Received
	(Dollars in thousands)
	$	25,000			16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		$	(2,093	)
	25,000				16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		(2,094		)
	25,000				9-Dec-08		10-Dec-08		10-Dec-18		3 Month LIBOR		0.24	%		2.94	%		(1,383		)
	$	75,000																	$	(5,570	)
	31-Dec-13
	Notional				Trade		Effective		Maturity		Receive		Current			Pay Fixed			Fair Value
	Amount				Date		Date		Date		(Variable)		Rate			Swap Rate
											Index		Received
	(Dollars in thousands)
	$	25,000			16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		$	(3,151	)
	25,000				16-Feb-06		28-Dec-06		28-Dec-16		3 Month LIBOR		0.24	%		5.04	%		(3,152		)
	25,000				9-Dec-08		10-Dec-08		10-Dec-18		3 Month LIBOR		0.24	%		2.94	%		(1,493		)
	50,000				17-Nov-09		20-Dec-10		20-Dec-14		3 Month LIBOR		0.25	%		3.04	%		(1,341		)
	25,000				5-May-11		10-Jun-11		10-Jun-15		3 Month LIBOR		0.24	%		1.71	%		(493		)
	$	150,000																	$	(9,630	)
Summary of customer related derivative positions, not designated as hedging	The following table reflects the Company’s customer related derivative positions for the periods indicated below for those derivatives not designated as hedges for accounting purposes:
		Number of			Notional Amount Maturing
		Positions (1)			Less than 1 year				Less than 2 years			Less than 3 years			Less than 4 years			Thereafter			Total		Fair Value
		31-Dec-14
		(Dollars in thousands)
	Loan level derivatives
	Receive fixed, pay variable	174			$	88,147			46,854			40,958			38,108			403,208			$	617,275	$	17,840
	Pay fixed, receive variable	168			$	88,147			46,854			40,958			38,108			403,208			$	617,275	$	(17,837	)
	Foreign exchange contracts
	Buys foreign currency, sells U.S. currency	23			$	57,112			—			—			—			—			$	57,112	$	4,007
	Buys U.S. currency, sells foreign currency	23			$	57,112			—			—			—			—			$	57,112	$	(3,984	)
		31-Dec-13
		(Dollars in thousands)
	Loan level derivatives
	Receive fixed, pay variable	168			$	48,882			97,975			42,957			42,116			329,554			$	561,484	$	9,484
	Pay fixed, receive variable	162			$	48,882			97,975			42,957			42,116			329,554			$	561,484	$	(9,523	)
	Foreign exchange contracts
	Buys foreign currency, sells U.S. currency	6			$	11,367			—			—			—			—			$	11,367	$	396
	Buys U.S. currency, sells foreign currency	6			$	11,367			—			—			—			—			$	11,367	$	(390	)
	(1) The Company may enter into one swap agreement which offsets multiple reverse swap agreements. The positions will offset and the terms will be identical.
Fair value of derivative financial instruments as well as their classification on the balance sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet at the periods indicated:
		Asset Derivatives										Liability Derivatives
				Fair Value at				Fair Value at						Fair Value at				Fair Value at
		Balance Sheet		31-Dec-14				31-Dec-13				Balance Sheet		31-Dec-14				31-Dec-13
		Location										Location
		(Dollars in thousands)
	Derivatives designated as hedges
	Interest rate derivatives	Other assets		$	—			$	—			Other liabilities		$	5,570			$	9,630
	Derivatives not designated as hedges
	Customer Related Positions:
	Loan level derivatives	Other assets		18,383				16,301				Other liabilities		18,380				16,340
	Foreign exchange contracts	Other assets		4,007				396				Other liabilities		3,984				390
	Mortgage Derivatives
	Interest rate lock commitments	Other assets		295				204				Other liabilities		—				—
	Forward TBA mortgage contracts	Other assets		$	—			$	64			Other liabilities		$	16			$	—
	Forward sales agreements	Other assets		3				—				Other liabilities		—				35
				$	22,688			$	16,965					$	22,380			$	16,765
	Total			$	22,688			$	16,965					$	27,950			$	26,395
Effect of derivative financial instruments included in OCI and current earnings	The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Derivatives designated as hedges
	Gain in OCI on derivatives (effective portion), net of tax	$	2,256			$	3,735			$	1,082
	Loss reclassified from OCI into interest expense (effective portion)	3,662				5,723				5,417
	Loss reclassified from OCI into noninterest expense (loss on termination)	$	1,122			$	—			$	—
	Loss recognized in income on derivatives (ineffective portion & amount excluded from effectiveness testing)
	Interest expense	$	—			$	—			$	—
	Other expense	—				—				—
	Total	$	—			$	—			$	—
	Derivatives not designated as hedges
	Changes in fair value of customer related positions
	Other income	$	63			$	38			$	134
	Other expense	(4		)		(116		)		(49		)
	Changes in fair value of mortgage derivatives
	Mortgage banking income	$	49			$	354			$	141
	Total	$	108			$	276			$	226

BALANCE_SHEET_OFFSETTING_Table

BALANCE SHEET OFFSETTING (Tables)	12 Months Ended
	Dec. 31, 2014
Offsetting [Abstract]
Financial Instruments Derivative Assets Liabilities and resell agreements net of amount not offset [Table Text Block]	The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the periods indicated:
								Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts Recognized		Gross Amounts Offset in the Statement of Financial Position		Net Amounts Presented in the Statement of Financial Position		Financial Instruments (1)		Collateral Pledged		Net Amount
		December 31, 2014
		(Dollars in thousands)
	Derivative Assets
	Interest rate swaps	$	—	$	—	$	—	$	—	$	—	$	—
	Loan level derivatives	18,383		—		18,383		272		—		18,111
	Customer foreign exchange contracts	4,007		—		4,007		—		—		4,007
		$	22,390	$	—	$	22,390	$	272	$	—	$	22,118
	Derivative Liabilities
	Interest rate swaps	$	5,571	$	—	$	5,571	$	—	$	5,571	$	—
	Loan level derivatives	18,380		—		18,380		272		17,836		272
	Customer foreign exchange contracts	3,984		—		3,984		—		—		3,984
	Repurchase agreements
	Customer repurchase agreements	147,890		—		147,890		—		147,890		—
	Wholesale repurchase agreements	50,000		—		50,000		—		50,000		—
		$	225,824	$	—	$	225,824	$	272	$	221,297	$	4,255
	-1	Reflects offsetting derivative positions with the same counterparty.
								Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts Recognized		Gross Amounts Offset in the Statement of Financial Position		Net Amounts Presented in the Statement of Financial Position		Financial Instruments (1)		Collateral Pledged		Net Amount
		December 31, 2013
		(Dollars in thousands)
	Derivative Assets
	Interest rate swaps	$	—	$	—	$	—	$	—	$	—	$	—
	Loan level swaps	16,301		—		16,301		2,823		—		13,478
	Customer foreign exchange contracts	396		—		396		—		—		396
		$	16,697	$	—	$	16,697	$	2,823	$	—	$	13,874
	Derivative Liabilities
	Interest rate swaps	$	9,630	$	—	$	9,630	$	—	$	9,630	$	—
	Loan level swaps	16,340		—		16,340		2,823		10,108		3,409
	Customer foreign exchange contracts	390		—		390		—		—		390
	Repurchase agreements
	Customer repurchase agreements	149,288		—		149,288		—		149,288		—
	Wholesale repurchase agreements	50,000		—		50,000		—		50,000		—
		$	225,648	$	—	$	225,648	$	2,823	$	219,026	$	3,799
	-1	Reflects offsetting derivative positions with the same counterparty.

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Taxes	The provision for income taxes is comprised of the following components:
		Years Ended December 31
		2014				2013				2012
		(Dollars in thousands)
	Current expense
	Federal	$	14,709			$	9,570			$	11,928
	State	6,350				4,357				4,664
	Total current expense	21,059				13,927				16,592
	Deferred expense (benefit)
	Federal	2,877				1,598				(1,183		)
	State	(37		)		959				(736		)
	Total deferred expense (benefit)	2,840				2,557				(1,919		)
	Total expense	$	23,899			$	16,484			$	14,673
Schedule of Income Tax Rate Reconciliation	The difference between the statutory federal income tax rate of 35% and the effective income tax rate reported for the last three years is detailed below:
		Years Ended December 31
		2014						2013					2012
		(Dollars in thousands)
	Computed statutory federal income tax provision	$	29,310		35	%		$	23,359		35	%	$	20,055		35	%
	State taxes, net of federal tax benefit	4,104			4.9	%		3,455			5.17	%	2,553			4.46	%
	Nontaxable interest, net	(795		)	(0.95	)%		(557		)	(0.83	)%	(542		)	(0.95	)%
	New Market Tax Credits	(6,708		)	(8.01	)%		(9,000		)	(13.48	)%	(6,371		)	(11.12	)%
	Low Income Housing Project Investments	(594		)	(0.71	)%		(194		)	(0.29	)%	(196		)	(0.34	)%
	Increase in cash surrender value of life insurance and tax exempt gain on benefit payments	(1,782		)	(2.13	)%		(1,209		)	(1.81	)%	(1,612		)	(2.81	)%
	Merger and other related costs (non-deductible)	274			0.33	%		366			0.55	%	404			0.71	%
	Other, net	90			0.11	%		264			0.39	%	382			0.66	%
	Total expense	$	23,899		28.54	%		$	16,484		24.7	%	$	14,673		25.61	%
Schedule of Net Deferred Tax Asset	The tax-effected components of the net deferred tax asset at December 31 were as follows:
		2014				2013
		(Dollars in thousands)
	Deferred tax assets
	Accrued expenses not deducted for tax purposes	$	10,666			$	8,530
	Allowance for loan losses	22,462				21,743
	Deferred gain on sale leaseback transaction	2,579				3,104
	Derivatives fair value adjustment	1,882				3,440
	Employee and director equity compensation	2,380				2,351
	Federal Home Loan Bank borrowings fair value adjustment	83				220
	Loan basis difference fair value adjustment	2,094				1,819
	Net operating loss carry-forward	230				1,671
	Net unrealized loss on securities available for sale	—				1,418
	New Markets Tax Credit carry-forward	521				2,257
	Other-than-temporary impairment on securities	4,072				4,074
	Other	1,426				1,481
	Total	$	48,395			$	52,108
	Deferred tax liabilities
	Core deposit and other intangibles	$	3,194			$	4,052
	Deferred loan fees, net	4,164				3,530
	Fixed assets	4,875				5,571
	Goodwill	14,194				13,030
	Net unrealized gain on securities available for sale	2,075				—
	Other	1,180				956
	Total	$	29,682			$	27,139
	Total net deferred tax asset	$	18,713			$	24,969
Reconciliation of Unrecognized Tax Benefits	The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits:
		(Dollars in thousands)
	Balance at December 31, 2012	$	126
	Reduction of tax positions for prior years	(113		)
	Increase for prior year tax position	42
	Increase for current year tax positions	—
	Balance at December 31, 2013	$	55
	Reduction of tax positions for prior years	(55		)
	Increase for prior year tax positions	—
	Increase for current year tax positions	—
	Balance at December 31, 2014	$	—

LOW_INCOME_HOUSING_PROJECT_INV1

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Low Income Housing Project Investments [Abstract]
Investments in Low Income Housing Projects [Table Text Block]	The following table presents certain information related to the Company's investments in low income housing projects as of December 31:
		2014		2013
		(Dollars in thousands)
	Original investment value	$	40,541	$	1,701
	Current recorded investment	38,943		1,193
	Unfunded liability obligation	28,004		51
	Tax credits and benefits earned during the year	1,683		236
	Amortization of investments during the year	1,089		187
	Net income tax benefit recognized during the year	594		49

EMPLOYEE_BENEFIT_PLANS_Tables

EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Schedule of Multiemployer Plan
				Funding Status			FIP/RP Status	Surcharge		Expiration	Minimum
				of Pension Plan			Pending/	Imposed		Date of	Contributions
							Implemented			Collective-	Required for
										Bargaining	Future
		EIN/Pension		2014	2013					Agreement	Periods
		Plan Number
	Pentegra defined benefit plan for financial institutions	13-5645888/333		At least 80 percent	At least 80 percent		No	No		N/A	$	—
Schedule of Multiemployer Plan Contributions	The Company’s contributions to the Pension Plan were as follows for the periods indicated:
					Plan Year Allocation
		Cash Payment			2014-2015			2013-2014			2012-2013
		(Dollars in thousands)
	2014	$	1,320		$	1,320		$	—		$	—
	2013	2,603			—			1,762			841
	2012	234			—			—			234
Schedule of Supplemental Retirement Expense and Contributions Paid	The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plan which were used only to pay the current year benefits as of the dates indicated:
		2014			2013			2012
		(Dollars in thousands)
	Retirement expense	$	954		$	1,049		$	1,144
	Contributions paid	271			253			253
Schedule of Expected Benefit Payments	The following table shows the Company's best estimate of the benefits expected to be paid in each of the next five years, in the aggregate for the next five fiscal years thereafter and in the aggregate after those 10 years:
		Defined Benefit Supplemental Executive
		Retirement Plans
		Expected Benefit
		Payment
		(Dollars in thousands)
	2015	$	315
	2016	437
	2017	431
	2018	466
	2019	515
	2020-2024	3,600
Schedule of Supplemental Executive Retirement Plans	The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented:
		Defined Benefit Supplemental Executive
		Retirement Benefits
		2014			2013			2012
		(Dollars in thousands)
	Change in accumulated benefit obligation
	Benefit obligation at beginning of year	$	8,243		$	8,714		$	7,550
	Accumulated service cost	397			429			627
	Interest cost	390			409			296
	Plan amendment	1,357			—			—
	Actuarial loss/(gain)	2,421			(1,056		)	494
	Benefits paid	(271		)	(253		)	(253		)
	Accumulated benefit obligation at end of year	$	12,537		$	8,243		$	8,714
	Change in plan assets
	Fair value of plan assets at beginning of year	$	—		$	—		$	—
	Employer contribution	271			253			253
	Benefits paid	(271		)	(253		)	(253		)
	Fair value of plan assets at end of year	$	—		$	—		$	—
	Funded status at end of year	$	(12,537	)	$	(8,243	)	$	(8,714	)
	Assets	—			—			—
	Liabilities	(12,537		)	(8,243		)	(8,714		)
	Accrued benefit cost	$	(12,537	)	$	(8,243	)	$	(8,714	)
	Amounts recognized in accumulated other comprehensive income (“AOCI”)
	Net loss	$	3,305		$	938		$	2,157
	Prior service cost	1,904			659			745
	Amounts recognized in AOCI	$	5,209		$	1,597		$	2,902
	Information for plans with an accumulated benefit obligation in excess of plan assets
	Projected benefit obligation	$	12,537		$	8,243		$	8,714
	Accumulated benefit obligation	$	12,537		$	8,243		$	8,714
	Net periodic benefit cost
	Service cost	$	397		$	429		$	627
	Interest cost	390			409			296
	Amortization of prior service cost	113			113			113
	Recognized net actuarial gain	54			155			108
	Net periodic benefit cost	$	954		$	1,106		$	1,144
	Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
	Net actuarial loss	$	309		$	18		$	151
	Net prior service cost	$	947		$	113		$	99
	Discount rate used for benefit obligation	2.24-3.84%			4.95		%	4.05		%
	Discount rate used for net periodic benefit cost	2.43-4.76%			4.05		%	4.4		%
	Rate of compensation increase	n/a			n/a			n/a

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis	Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated:
					Fair Value Measurements at Reporting Date Using
		Balance			Quoted Prices in			Significant Other				Significant
					Active Markets			Observable				Unobservable
					for Identical			Inputs				Inputs
					Assets			(Level 2)				(Level 3)
					(Level 1)
		(Dollars in thousands)
		December 31, 2014
	Recurring fair value measurements
	Assets
	Securities available for sale
	U.S. Government agency securities	$	41,486		$	—		$	41,486			$	—
	Agency mortgage-backed securities	217,678			—			217,678				—
	Agency collateralized mortgage obligations	63,035			—			63,035				—
	State, county, and municipal securities	5,223			—			5,223				—
	Single issuer trust preferred securities issued by banks and insurers	2,909			—			2,909				—
	Pooled trust preferred securities issued by banks and insurers	6,321			—			—				6,321
	Equity securities	11,902			11,902			—				—
	Loans held for sale	6,888			—			6,888				—
	Derivative instruments	22,688			—			22,688				—
	Liabilities
	Derivative Instruments	27,950			—			27,950				—
	Total recurring fair value measurements	$	350,180		$	11,902		$	331,957			$	6,321
	Nonrecurring fair value measurements
	Assets
	Collateral dependent impaired loans	$	8,196		$	—		$	—			$	8,196
	Other real estate owned and other foreclosed assets	7,743			—			—				7,743
	Total nonrecurring fair value measurements	$	15,939		$	—		$	—			$	15,939
		(Dollars in thousands)
		31-Dec-13
	Recurring fair value measurements
	Assets
	Securities available for sale
	U.S. Government agency securities	$	40,449		$	—		$	40,449			$	—
	Agency mortgage-backed securities	234,591			—			234,591				—
	Agency collateralized mortgage obligations	58,153			—			58,153				—
	State, county, and municipal securities	5,412			—			5,412				—
	Single issuer trust preferred securities issued by banks and insurers	2,952			—			2,952				—
	Pooled trust preferred securities issued by banks and insurers	3,841			—			—				3,841
	Equity securities	11,464			11,464			—				—
	Loans held for sale	8,882			—			8,882				—
	Derivative instruments	16,965			—			16,965				—
	Liabilities
	Derivative instruments	26,395			—			26,395				—
	Total recurring fair value measurements	$	356,314		$	11,464		$	341,009			$	3,841
	Nonrecurring fair value measurements:
	Assets
	Collateral dependent impaired loans	$	10,328		$	—		$	—			$	10,328
	Other real estate owned and other foreclosed assets	7,633			—			—				7,633
	Total nonrecurring fair value measurements	$	17,961		$	—		$	—			$	17,961
Reconciliation of Assets on Recurring Basis Using Significant Unobservable Inputs	The table below presents a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). These instruments were valued using pricing models and discounted cash flow methodologies. The following table provides a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated:
		Securities Available for Sale
		(Dollars in thousands)
		31-Dec-14						31-Dec-13											31-Dec-12
		Pooled			Total			Pooled				Private				Total			Pooled			Single			Private			Total
		Trust						Trust				Mortgage-							Trust			Trust			Mortgage-
		Preferred						Preferred				Backed							Preferred			Preferred			Backed
		Securities						Securities				Securities							Securities			Securities			Securities
	Beginning balance	$	3,841		$	3,841		$	2,981			$	3,532			$	6,513		$	2,820		$	4,210		$	6,110		$	13,140
	Gains and (losses) (realized/unrealized)
	Included in earnings	—			—			—				—				—			—			—			(76		)	(76		)
	Included in other comprehensive income	2,655			2,655			1,132				(64		)		1,068			313			703			411			1,427
	Sales	—			—			—				(2,695		)		(2,695		)	—			—			—			—
	Settlements	(175		)	(175		)	(272		)		(773		)		(1,045		)	(152		)	—			(2,913		)	(3,065		)
	Transfers into (out of) level 3	$	—		$	—		$	—			$	—			$	—		$	—		$	(4,913	)	$	—		$	(4,913	)
	Ending balance	$	6,321		$	6,321		$	3,841			$	—			$	3,841		$	2,981		$	—		$	3,532		$	6,513
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table sets forth certain unobservable inputs regarding the Company's investment in securities that are classified as Level 3:
			December 31,								December 31,				December 31,
			2014			2013					2014		2013		2014		2013
	Valuation Technique		Fair Value						Unobservable Inputs		Range				Weighted Average
			(Dollars in Thousands)
	Discounted cash flow methodology
	Pooled trust preferred securities		$	6,321		$	3,841		Cumulative prepayment		0% - 75%		0% - 76%		7.00%		7.20%
									Cumulative default		3% - 100%		3% - 100%		13.90%		18.10%
									Loss given default		85% - 100%		85% - 100%		96.10%		95.70%
									Cure given default		0% - 75%		0% - 75%		46.70%		39.90%
	Appraisals of collateral (1)
	Impaired loans		$	8,196		$	10,328
	Other real estate owned and foreclosed assets		$	7,743		$	7,633
	-1	Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.
Schedule of Fair Values and Related Carrying Amounts by Balance Sheet Grouping	The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the periods indicated:
								Fair Value Measurements at Reporting Date Using
		Book Value			Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
		31-Dec-14
		(Dollars in thousands)
	Financial assets
	Securities held to maturity(a)
	U.S. Treasury securities	$	1,010		$	1,073		$	—			$	1,073			$	—
	Agency mortgage-backed securities	159,522			164,944			—				164,944				—
	Agency collateralized mortgage obligations	207,995			206,658			—				206,658				—
	State, county, and municipal securities	424			428			—				428				—
	Single issuer trust preferred securities issued by banks	1,500			1,477			—				1,477				—
	Corporate debt securities	5,002			5,119			—				5,119				—
	Loans, net of allowance for loan losses(b)	4,915,633			4,883,479			—				—				4,883,479
	Financial liabilities
	Time certificates of deposits(c)	$	649,620		$	651,180		$	—			$	651,180			$	—
	Federal Home Loan Bank borrowings(c)	70,080			70,208			—				70,208				—
	Customer repurchase agreements and other short-term borrowings(c)	147,890			147,890			—				—				147,890
	Wholesale repurchase agreements(c)	50,000			50,510			—				—				50,510
	Junior subordinated debentures(d)	73,685			70,045			—				70,045				—
	Subordinated debentures(c)	65,000			64,198			—				—				64,198
		31-Dec-13
	Financial assets	(Dollars in thousands)
	Securities held to maturity(a)
	U.S. Treasury securities	$	1,011		$	1,042		$	—			$	1,042			$	—
	Agency mortgage-backed securities	155,067			155,951			—				155,951				—
	Agency collateralized mortgage obligations	187,388			182,036			—				182,036				—
	State, county, and municipal securities	678			685			—				685				—
	Single issuer trust preferred securities issued by banks	1,503			1,526			—				1,526				—
	Corporate debt securities	5,005			5,215			—				5,215				—
	Loans, net of allowance for loan losses(b)	4,665,068			4,655,920			—				—				4,655,920
	Financial liabilities
	Time certificates of deposits(c)	$	743,628		$	746,908		$	—			$	746,908			$	—
	Federal Home Loan Bank borrowings(c)	140,294			140,321			—				140,321				—
	Customer repurchase agreements and other short-term borrowings(c)	154,288			154,349			—				—				154,349
	Wholesale repurchase agreements(c)	50,000			51,298			—				—				51,298
	Junior subordinated debentures(d)	73,906			67,481			—				67,481				—
	Subordinated debentures(c)	30,000			28,396			—				—				28,396
	(a)	The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.
	(b)	Fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows.
	(c)	Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
	(d)	Fair value was determined based upon market prices of securities with similar terms and maturities.

OTHER_COMPREHENSIVE_LOSS_Table

OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Other Comprehensive Loss	The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
		Year Ended December 31, 2014
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	9,095		$	(3,570	)	$	5,525
	Less: net security gains reclassified into other noninterest income	191			(78		)	113
	Net change in fair value of securities available for sale	8,904			(3,492		)	5,412
	Change in fair value of cash flow hedges (2)	(969		)	396			(573		)
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(3,662		)	1,496			(2,166		)
	Less: loss on termination of hedge reclassified into noninterest expense	(1,122		)	459			(663		)
	Net change in fair value of cash flow hedges	3,815			(1,559		)	2,256
	Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period	(2,699		)	1,103			(1,596		)
	Net prior service costs related to plan amendment arising during the period	(1,357		)	554			(803		)
	Less: amortization of actuarial gains	44			(18		)	26
	Less: amortization of prior service costs	(102		)	42			(60		)
	Less: amortization of transfer obligations	2			(1		)	1
	Net change in other comprehensive income for defined benefit postretirement plans	(4,000		)	1,634			(2,366		)
	Total other comprehensive income	$	8,719		$	(3,417	)	$	5,302
		Year Ended December 31, 2013
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	(11,943	)	$	4,578		$	(7,365	)
	Less: net security gains reclassified into other noninterest income	230			(94		)	136
	Net change in fair value of securities available for sale	(12,173		)	4,672			(7,501		)
	Change in fair value of cash flow hedges (2)	592			(242		)	350
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(5,723		)	2,338			(3,385		)
	Net change in fair value of cash flow hedges	6,315			(2,580		)	3,735
	Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period	1,302			(532		)	770
	Net prior service costs related to plan amendments arising during the period
	Less: amortization of actuarial losses	(42		)	17			(25		)
	Less: amortization of prior service costs	(102		)	42			(60		)
	Less: amortization of transfer obligations	(4		)	1			(3		)
	Net change in other comprehensive income for defined benefit postretirement plans	1,450			(592		)	858
	Total other comprehensive loss	$	(4,408	)	$	1,500		$	(2,908	)
		Year Ended December 31, 2012
		Pre Tax			Tax (Expense)			After Tax
		Amount			Benefit			Amount
		(Dollars in thousands)
	Change in fair value of securities available for sale	$	(1,682	)	$	541		$	(1,141	)
	Less: net security losses reclassified into other noninterest income (1)	(76		)	31			(45		)
	Net change in fair value of securities available for sale	(1,606		)	510			(1,096		)
	Change in fair value of cash flow hedges (2)	(3,588		)	1,466			(2,122		)
	Less: net cash flow hedge losses reclassified into interest on borrowings expense	(5,417		)	2,213			(3,204		)
	Net change in fair value of cash flow hedges	1,829			(747		)	1,082
	Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period	(196		)	80			(116		)
	Net prior service costs related to plan amendments arising during the period
	Less: amortization of actuarial losses	(5		)	2			(3		)
	Less: amortization of prior service costs	(113		)	46			(67		)
	Less: amortization of transfer obligations	(34		)	14			(20		)
	Net change in other comprehensive income for defined benefit postretirement plans	(44		)	18			(26		)
	Total other comprehensive loss	$	179		$	(219	)	$	(40	)
	-1	Net security losses represent pre-tax OTTI credit related losses of $76,000 for the year ended December 31, 2012.
	-2	The change in fair value of cash flow hedges includes the remaining balance of a realized but unrecognized gain from the termination of interest rate swaps in June 2009. The original gain of $1.4 million net of tax, will be recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain had amortized to $571,000, $715,000, and $859,000 at December 31, 2014, 2013, and 2012, respectively.
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax	Information on the Company's accumulated other comprehensive loss, net of tax, is comprised of the following components as of the periods indicated:
		Unrealized Gain on Securities			Unrealized Loss on Cash Flow Hedge			Deferred Gain on Hedge Transactions			Defined Benefit Postretirement Plans			Accumulated Other Comprehensive Loss
		(Dollars in Thousands)
	Beginning balance: January 1, 2012	$	6,574		$	(10,804	)	$	1,004		$	(1,260	)	$	(4,486	)
	Net change in other comprehensive income (loss)	(1,096		)	1,227			(145		)	(26		)	(40		)
	Ending balance: December 31, 2012	$	5,478		$	(9,577	)	$	859		$	(1,286	)	$	(4,526	)
	Net change in other comprehensive income (loss)	(7,501		)	3,879			(144		)	858			(2,908		)
	Ending balance: December 31, 2013	$	(2,023	)	$	(5,698	)	$	715		$	(428	)	$	(7,434	)
	Net change in other comprehensive income (loss)	5,412			2,400			(144		)	(2,366		)	5,302
	Ending balance: December 31, 2014	$	3,389		$	(3,298	)	$	571		$	(2,794	)	$	(2,132	)

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Off-Balance Sheet Financial Instruments
		2014		2013
		(Dollars In thousands)
	Commitments to extend credit	$	1,822,369	$	1,621,873
	Standby letters of credit	18,516		18,923
	Deferred standby letter of credit fees	105		87
Schedule of Minimum Future Lease Commitments	The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. The following is a schedule of minimum future lease payments under such leases as of December 31, 2014:
		(Dollars In thousands)
	2015	$	7,945
	2016	7,540
	2017	7,040
	2018	5,659
	2019	4,932
	Thereafter	9,743
	Total future minimum lease commitments	$	42,859

REGULATORY_CAPITAL_REQUIREMENT1

REGULATORY CAPITAL REQUIREMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2014 and 2013 are also presented in the table that follows:
		Actual				For Capital					To Be Well Capitalized
						Adequacy Purposes					Under Prompt
											Corrective Action
											Provisions
		Amount		Ratio		Amount			Ratio		Amount			Ratio
		31-Dec-14
		(Dollars in thousands)
	Independent Bank Corp.
	Total capital (to risk weighted assets)	$	666,898	13.15	%	$	405,650	≥	8	%	N/A			N/A
	Tier 1 capital (to risk weighted assets)	551,836		10.88		202,825		≥	4		N/A			N/A
	Tier 1 capital (to average assets)	551,836		8.84		249,825		≥	4		N/A			N/A
	Rockland Trust Company
	Total capital (to risk weighted assets)	$	607,100	11.98	%	$	405,465	≥	8	%	$	506,831	≥	10	%
	Tier 1 capital (to risk weighted assets)	527,038		10.4		202,732		≥	4		304,099		≥	6
	Tier 1 capital (to average assets)	527,038		8.44		249,788		≥	4		312,235		≥	5
		December 31, 2013
		(Dollars in thousands)
	Independent Bank Corp.
	Total capital (to risk weighted assets)	$	589,811	12.58	%	$	375,117	≥	8	%	N/A			N/A
	Tier 1 capital (to risk weighted assets)	505,646		10.78		187,558		≥	4		N/A			N/A
	Tier 1 capital (to average assets)	505,646		8.64		234,153		≥	4		N/A			N/A
	Rockland Trust Company
	Total capital (to risk weighted assets)	$	582,599	12.42	%	$	375,205	≥	8	%	$	469,006	≥	10	%
	Tier 1 capital (to risk weighted assets)	498,434		10.63		187,603		≥	4		281,404		≥	6
	Tier 1 capital (to average assets)	498,434		8.51		234,154		≥	4		292,692		≥	5

PARENT_COMPANY_FINANCIALS_ONLY1

PARENT COMPANY FINANCIALS ONLY (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheets	BALANCE SHEETS
		31-Dec
		2014			2013
		(Dollars in thousands)
	Assets
	Cash (1)	$	64,791		$	16,855
	Investments in subsidiaries(2)	691,406			661,257
	Prepaid income taxes	285			—
	Deferred tax asset	2,620			3,777
	Deferred stock issuance costs	467			201
	Total assets	$	759,569		$	682,090
	Liabilities and stockholders’ equity
	Dividends payable	$	5,761		$	5,243
	Short-term borrowings	—			5,000
	Junior subordinated debentures	73,685			73,906
	Subordinated debentures	35,000			—
	Accrued income taxes	—			8
	Derivative instruments(1)	4,187			6,303
	Other liabilities	409			90
	Total liabilities	119,042			90,550
	Stockholders’ equity	640,527			591,540
	Total liabilities and stockholders’ equity	$	759,569		$	682,090
	-1	Entire balance eliminates in consolidation.
	-2	689.2 million and $659.1 million eliminate in consolidation at December 31, 2014 and 2013, respectively.
Schedule of Condensed Statements of Income	STATEMENTS OF INCOME
		Years Ended December 31
		2014			2013			2012
		(Dollars in thousands)
	Income
	Dividends received from subsidiaries(1)	$	40,170		$	30,694		$	28,709
	Interest income(2)	57			50			83
	Total income	40,227			30,744			28,792
	Expenses
	Interest expense	4,225			4,122			3,795
	Other expenses	—			15			6
	Total expenses	4,225			4,137			3,801
	Income before income taxes and equity in undistributed income of subsidiaries	36,002			26,607			24,991
	Income tax benefit	(1,298		)	(1,342		)	(1,636		)
	Income of parent company	37,300			27,949			26,627
	Equity in undistributed income of subsidiaries	22,545			22,305			16,000
	Net income	$	59,845		$	50,254		$	42,627
	-1	Income of $53,000, $54,000 and $45,000 was not eliminated in consolidation for the years ended December 31, 2014, 2013, and 2012, respectively.
	-2	Entire balance eliminated in consolidation.
Schedule of Condensed Statements of Cash Flows	STATEMENTS OF CASH FLOWS
		Years Ended December 31
		2014			2013			2012
		(Dollars in thousands)
	Cash flows from operating activities
	Net income	$	59,845		$	50,254		$	42,627
	Adjustments to reconcile net income to cash provided by operating activities
	Accretion	(486		)	(155		)	(13		)
	Deferred income tax expense (benefit)	293			203			(398		)
	Change in other assets	—			(373		)	5,430
	Change in other liabilities	25			206			(240		)
	Equity in undistributed income of subsidiaries	(22,545		)	(22,305		)	(16,000		)
	Net cash provided by operating activities	37,132			27,830			31,406
	Cash flows used in investing activities
	Cash paid for acquisitions, net of cash acquired	—			(10,832		)	(21,648		)
	Net cash used in investing activities	—			(10,832		)	(21,648		)
	Cash flows used in financing activities
	Proceeds from short-term borrowings	—			10,000			12,000
	Repayment of short-term borrowings	(5,000		)	(17,000		)	(10,053		)
	Proceeds from subordinated debentures	35,000			—			—
	Proceeds from stock issued and stock options exercised	1,692			2,475			1,242
	Issuance of shares under direct stock purchase plan	1,555			969			1,691
	Common dividend paid	(22,443		)	(15,122		)	(22,494		)
	Net cash provided by (used in) financing activities	10,804			(18,678		)	(17,614		)
	Net increase (decrease) in cash and cash equivalents	47,936			(1,680		)	(7,856		)
	Cash and cash equivalents at the beginning of the year	16,855			18,535			26,391
	Cash and cash equivalents at the end of the year	$	64,791		$	16,855		$	18,535

SELECTED_QUARTERLY_FINANCIAL_D1

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
		2014		2013		2014		2013		2014		2013		2014		2013
						(Dollars in thousands, except per share data)
	Interest income	$	52,980	$	50,820	$	54,285	$	51,495	$	54,368	$	51,027	$	54,827	$	52,571
	Interest expense	5,374		5,958		5,232		5,880		4,805		5,831		5,007		5,666
	Net interest income	$	47,606	$	44,862	$	49,053	$	45,615	$	49,563	$	45,196	$	49,820	$	46,905
	Provision for loan losses	4,502		1,300		2,250		3,100		1,901		2,650		1,750		3,150
	Total noninterest income	17,516		15,724		16,857		16,692		17,098		18,130		18,473		17,464
	Total noninterest expenses	41,887		42,920		42,980		42,164		42,607		40,722		44,364		47,845
	Provision for income taxes	5,350		4,114		5,934		4,285		6,415		5,299		6,201		2,786
	Net income	$	13,383	$	12,252	$	14,746	$	12,758	$	15,738	$	14,655	$	15,978	$	10,588
	Basic earnings per share	0.56		0.54		0.62		0.56		0.66		0.64		0.67		0.45
	Diluted earnings per share	0.56		0.54		0.61		0.56		0.66		0.64		0.66		0.45
	Weighted average common shares (basic)	23,819,065		22,823,753		23,897,413		22,888,155		23,911,678		22,946,308		23,968,320		23,383,608
	Common stock equivalents	100,173		46,040		94,560		52,144		90,685		100,806		86,812		97,445
	Weighted average common shares (diluted)	23,919,238		22,869,793		23,991,973		22,940,299		24,002,363		23,047,114		24,055,132		23,481,053
	Unusual or infrequently occurring items
	Items within noninterest income
	Gain on extinguishment of debt	$	—	$	—	$	—	$	—	$	—	$	763	$	—	$	—
	Gain on life insurance benefits	1,627		—		337		—		—		—		—		227
	Gain on sale of fixed income securities	—		—		—		—		—		—		121		258
	Total	$	1,627	$	—	$	337	$	—	$	—	$	763	$	121	$	485
	Items within noninterest expense
	Impairment on acquired facilities	$	503	$	—	$	—	$	—	$	21	$	—	$	—	$	—
	Loss on sale of fixed income securities	—		—		—		—		—		—		21		—
	Loss on termination of derivatives	—		—		1,122		—		—		—		—		—
	Merger and acquisition expense	77		1,345		—		754		677		366		586		6,219
	Severance	—		325		—		—		—		—		—		—
	Total	$	580	$	1,670	$	1,122	$	754	$	698	$	366	$	607	$	6,219

SUMMARY_OF_SIGNIFICANT_ACCOUNT3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2014
Core deposit intangibles [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	9 years
Core deposit intangibles [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Noncompete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years
Noncompete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Brand Name [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years
Leases [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years
Leases [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	29 years

SUMMARY_OF_SIGNIFICANT_ACCOUNT4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Line Items]
Reserve for unfunded loan commitments	813,000	716,000
Maximum [Member]
Accounting Policies [Line Items]
Lease option period	15 years
Loans Receivable [Member] | Lender Concentration Risk [Member] | Residential Building [Member]
Accounting Policies [Line Items]
Loans of nonresidential buildings to total loan portfolio	16.40%	16.00%
Full Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches	75
Limited Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches	3
Commercial Banking Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	11
Investment Management Office [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of offices	5
Mortgage Lending Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	3

ACQUISITIONS_Details

ACQUISITIONS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 09, 2012
In Thousands, unless otherwise specified
Assets
Goodwill	$170,421	$170,421	$150,391	$130,074
Central Bankcorp, Inc. [Member]
Assets
Cash					12,683
Investments					28,268
Loans					450,671
Premises and equipment					6,277
Goodwill					22,544
Core deposit intangible					2,150
Other assets					37,309
Total assets acquired					559,902
Liabilities
Deposits					357,434
Borrowings					144,920
Other liabilities					5,511
Total liabilities assumed					507,865
Purchase price					$52,037

ACQUISITIONS_Details_1

ACQUISITIONS (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 15, 2013	Nov. 09, 2012
Business Acquisition [Line Items]
Contractually required principal and interest payments receivable				$4,440	$47,548	[1]
Certain Loans Acquired in Transfer, Nonaccretable Difference				-1,296	-8,733
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition				3,144	38,815	[1]
Interest component of expected cash flows	-2,974	-2,514	-2,464	-386	-3,095
Less: fair value (initial carrying amount)				2,758	35,720
Mayflower Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest payments receivable				4,440
Net interest income after provision for loan losses	178,556	162,781
Net income	55,103	44,133
Certain Loans Acquired in Transfer, Nonaccretable Difference				-1,296
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition				3,144
Interest component of expected cash flows				-386
Less: fair value (initial carrying amount)				2,758
Central Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest payments receivable					47,548
Net interest income after provision for loan losses		165,860	170,514
Net income		47,261	46,477
Certain Loans Acquired in Transfer, Nonaccretable Difference					-8,733
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					38,815
Interest component of expected cash flows					-3,095
Less: fair value (initial carrying amount)					$35,720
[1]	Reflective of anticipated prepayments.

ACQUISITIONS_Details_2

ACQUISITIONS (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Nov. 15, 2013	Dec. 31, 2012	Nov. 09, 2012
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition			$4,440		$47,548	[1]
Contractual cash flows not expected to be collected			-1,296		-8,733
Expected cash flows at acquisition			3,144		38,815	[1]
Interest component of expected cash flows	-2,974	-2,514	-386	-2,464	-3,095
Basis in PCI loans at acquisition - estimated fair value			2,758		35,720
Central Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Net interest income after provision for loan losses	178,556	162,781
Contractually required principal and interest at acquisition			4,440
Contractual cash flows not expected to be collected			-1,296
Expected cash flows at acquisition			3,144
Interest component of expected cash flows			-386
Basis in PCI loans at acquisition - estimated fair value			2,758
Net income	$55,103	$44,133
[1]	Reflective of anticipated prepayments.

ACQUISITIONS_Details_Textual

ACQUISITIONS (Details Textual) (USD $)	0 Months Ended	3 Months Ended							12 Months Ended			0 Months Ended
	Nov. 09, 2012	Dec. 31, 2014	Sep. 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	Nov. 15, 2013
Business Acquisition [Line Items]
Acquisition Related Costs		$586,000	$677,000	$77,000	$6,219,000	$366,000	$754,000	$1,345,000	$1,339,000	$8,685,000	$6,741,000
Proceeds from sale of loans acquired in acquisition	42,200,000
Pay down of Federal Home Loan Bank Advances	25,000,000								-5,000,000	-79,946,000	-79,991,000
Finite-lived intangible asset acquired, useful life									9 years 10 months 24 days
Business Combination, Pro Forma Information [Abstract]
Acquisition related costs net of tax, excluded from pro forma results									4,500,000	4,500,000
Acquisition related costs per share, diluted, excluded from pro forma results (in dollars per share)									$0.19	$0.20
Central Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share	$32
Number of shares of company stock issued for each share of Central common stock (in shares)	1.0533
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)	$29.95
Company's closing price per share (in dollars per share)	$28.44
Business transaction value	52,000,000
Cost of acquired entity, percentage cash	40.00%
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration	60.00%
Cost of acquired entity, cash paid	21,600,000
Consideration Transferred, Equity Interests Issued and Issuable	30,400,000
Increase in acquirer outstanding shares	1,068,514
Acquisition Related Costs									1,800,000
Loans acquired	450,671,000
Interest income attributable to acquired loans									3,100,000
Mayflower Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share												$17.50
Number of shares of company stock issued for each share of Central common stock (in shares)												0.565
Value of shares of company stock issued for each share of acquiree stock (in dollars per share)												$20.28
Company's closing price per share (in dollars per share)												$35.90
Business transaction value												40,300,000
Cost of acquired entity, percentage cash												30.00%
Business Acquisition, Cost of Acquired Entity, Percentage Stock Consideration												70.00%
Cost of acquired entity, cash paid												10,900,000
Consideration Transferred, Equity Interests Issued and Issuable												29,400,000
Increase in acquirer outstanding shares												818,650
Acquisition Related Costs					6,700,000				6,900,000
Loans acquired												126,570,000
Interest income attributable to acquired loans		$641,000

ACQUISITIONS_Mayflower_Net_Ass

ACQUISITIONS Mayflower - Net Assets Acquired at Fair Value (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 15, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$170,421	$170,421	$150,391	$130,074
Mayflower Bankcorp, Inc. [Member]
Business Acquisition [Line Items]
Cash					21,390
Investments					77,953
Loans					126,570
Premises and equipment					7,128
Goodwill					20,030
Core deposit intangible					2,610
Other assets					7,104
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets					262,785
Deposits					218,877
Borrowings					1,121
Other liabilities					2,527
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities					222,525
Purchase price					$40,260

SECURITIES_Details_1

SECURITIES (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities:
Amortized Cost	$343,093	$360,317
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	8,832	7,675
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-3,371	-11,130
Fair Value	348,554	356,862
Held-to-maturity Securities:
Amortized Cost	375,453	350,652
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	7,747	3,012
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-3,501	-7,209
Fair Value	379,699	346,455
Available-for-sale Securities and Held-to-maturity Securities:
Amortized Cost	718,546	710,969
Gross Unrealized Gains	16,579	10,687
Gross Unrealized Losses	6,872	18,339
Fair Value	728,253	703,317
U.S. Government agency securities
Available-for-sale Securities:
Amortized Cost	41,369	41,331
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	139	3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-22	-885
Fair Value	41,486	40,449
U.S. treasury securities [Member]
Held-to-maturity Securities:
Amortized Cost	1,010	1,011
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	63	31
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fair Value	1,073	1,042
Agency mortgage-backed securities [Member]
Available-for-sale Securities:
Amortized Cost	211,168	232,742
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	7,203	6,405
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-693	-4,556
Fair Value	217,678	234,591
Held-to-maturity Securities:
Amortized Cost	159,522	155,067
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,422	1,917
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	-1,033
Fair Value	164,944	155,951
Agency collateralized mortgage obligations [Member]
Available-for-sale Securities:
Amortized Cost	63,059	58,765
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	599	490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-623	-1,102
Fair Value	63,035	58,153
Held-to-maturity Securities:
Amortized Cost	207,995	187,388
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2,141	824
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-3,478	-6,176
Fair Value	206,658	182,036
State, county, and municipal securities [Member]
Available-for-sale Securities:
Amortized Cost	5,106	5,439
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	117	1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	-28
Fair Value	5,223	5,412
Held-to-maturity Securities:
Amortized Cost	424	678
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4	7
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fair Value	428	685
Single issuer trust preferred securities issued by banks [Member]
Available-for-sale Securities:
Amortized Cost	2,913	2,960
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	12	14
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-16	-22
Fair Value	2,909	2,952
Held-to-maturity Securities:
Amortized Cost	1,500	1,503
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	23
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-23	0
Fair Value	1,477	1,526
Pooled trust preferred securities issued by banks and insurers
Available-for-sale Securities:
Amortized Cost	7,906	8,083
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	195	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-1,780	-4,242
Fair Value	6,321	3,841
Marketable securities [Member]
Available-for-sale Securities:
Amortized Cost	11,572	10,997
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	567	762
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-237	-295
Fair Value	11,902	11,464
Corporate debt securities [Member]
Held-to-maturity Securities:
Amortized Cost	5,002	5,005
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	117	210
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fair Value	$5,119	$5,215

SECURITIES_Details_2

SECURITIES (Details 2) (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 the contractual maturities of securities
Gross realized gains on fixed income securities	$121	$0	$0	$0	$258	$0	$0	$0	$121	$258	$5
Gross realized losses on fixed income securities	-21	0	0	0	0	0	0	0	-21	0	0
Gain (Loss) on Sale of Equity Investments									91	-28	111
Gain (Loss) on Investments									$191	$230	$116

SECURITIES_Details_3

SECURITIES (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available for Sale, Amortized Cost
Available-for-sale Equity Securities, Amortized Cost Basis	$11,572
Amortized Cost, Total	343,093	360,317
Available for Sale, Fair Value
Assets Designated to Closed Block, Equity Securities, Available-for-sale, at Fair Value	11,902
Fair Value	348,554	356,862
Held to Maturity, Amortized Cost
Amortized Cost, Total	375,453	350,652
Held to Maturity, Fair Value
Fair Value	379,699	346,455
Debt Securities [Member]
Available for Sale, Amortized Cost
Due in one year or less	0
Due after one year to five years	36,094
Due after five to ten years	90,680
Due after ten years	204,747
Amortized Cost, Total	331,521
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	36,819
Due after five to ten years	91,060
Due after ten years	208,773
Fair Value	336,652
Held to Maturity, Amortized Cost
Due in one year or less	200
Due after one year to five years	5,454
Due after five to ten years	31,805
Due after ten years	337,994
Amortized Cost, Total	375,453
Held to Maturity, Fair Value
Due in one year or less	202
Due after one year to five years	5,586
Due after five to ten years	32,429
Due after ten years	341,482
Fair Value	379,699
Marketable securities [Member]
Held to Maturity, Amortized Cost
Amortized Cost, Total	0
Held to Maturity, Fair Value
Fair Value	$0

SECURITIES_Details_4

SECURITIES (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	holding	holding
Summary of gross unrealized losses and fair value of investments
No of holdings	80	221
Fair value, less than 12 months	$64,537	$433,230
Fair value, 12 months or longer	143,949	10,928
Fair value, Total	208,486	444,158
Unrealized losses, Total	-6,448	-16,010
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-467	-13,520
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	-5,981	-2,490
US Government Agencies Debt Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	22	39
Fair value, less than 12 months	21,950	39,950
Fair value, 12 months or longer	0	0
Fair value, Total	21,950	39,950
Unrealized losses, Total	-22	-885
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-22	-885
Agency mortgage-backed securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	17	124
Fair value, less than 12 months	3,471	202,004
Fair value, 12 months or longer	42,222	5,108
Fair value, Total	45,693	207,112
Unrealized losses, Total	-693	-5,589
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-1	-5,217
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	-692	-372
Agency collateralized mortgage obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	14	19
Fair value, less than 12 months	35,083	183,721
Fair value, 12 months or longer	94,974	0
Fair value, Total	130,057	183,721
Unrealized losses, Total	-4,101	-7,278
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-331	-7,278
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	-3,770
US States and Political Subdivisions Debt Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings		13
Fair value, less than 12 months		3,838
Fair value, 12 months or longer		0
Fair value, Total		3,838
Unrealized losses, Total		28
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		28
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		0
Single issuer trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings	2	2
Fair value, less than 12 months	2,553	1,341
Fair value, 12 months or longer	0	0
Fair value, Total	2,553	1,341
Unrealized losses, Total	-39	-22
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-39	-22
Pooled trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings	2	2
Fair value, less than 12 months	0	0
Fair value, 12 months or longer	2,681	2,300
Fair value, Total	2,681	2,300
Unrealized losses, Total	-1,356	-1,913
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	-1,356	-1,913
Marketable securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	23	22
Fair value, less than 12 months	1,480	2,376
Fair value, 12 months or longer	4,072	3,520
Fair value, Total	5,552	5,896
Unrealized losses, Total	-237	-295
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	-74	-90
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	($163)	($205)

SECURITIES_Details_7

SECURITIES (Details 7) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gross change in OTTI recorded on certain investments	$2,098	$588	$678
Portion of OTTI recognized in OCI	-2,098	-588	-754
Net impairment losses recognized in earnings on securities	$0	$0	($76)

SECURITIES_Details_8

SECURITIES (Details 8) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of cumulative credit related component of OTTI
Balance at beginning of period	($9,997)	($10,847)	($10,771)
Add
Incurred on securities not previously impaired	0	0	0
Incurred on securities previously impaired	0	0	-76
Less
Securities sold during the period	0	850	0
Reclassification due to changes in Company’s intent	0	0	0
Increases in cash flow expected to be collected	0	0	0
Balance at end of period	($9,997)	($9,997)	($10,847)

SECURITIES_Details_Textual

SECURITIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-For-Sale Securities, Other-Than-Temporary Impairment Unrealized Losses, Portion Recognized In Other Comprehensive Income		$230,000	$2,300,000
Trading securities realized gain	285,000
Callable securities in investment portfolio		34,800,000
Investment securities pledged		$340,000,000	$360,100,000

Allowance_Allocations_Details

Allowance Allocations (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
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					$53,239					$51,834	$53,239		$51,834		$48,260
Charge-offs											-10,947		-10,518		-16,592
Recoveries											2,405		1,723		2,110
Provision	1,750		1,901	2,250	4,502	3,150		2,650	3,100	1,300	10,403		10,200		18,056
Ending balance	55,100					53,239					55,100		53,239		51,834
Ending balance: individually evaluated for impairment	2,416					3,774					2,416		3,774		3,420
Ending balance: collectively evaluated for impairment	52,684					49,465					52,684		49,465		48,414
Financing receivables ending balance:
Collectively evaluated for impairment	4,890,383					4,616,708					4,890,383		4,616,708		4,420,298
Individually evaluated for impairment	58,035					72,055					58,035		72,055		66,659
Purchase credit impaired loans	22,315					29,544					22,315		29,544		32,054
Total loans	4,970,733	[1]				4,718,307	[1]				4,970,733	[1]	4,718,307	[1]	4,519,011	[1]
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					15,622					13,461	15,622		13,461		11,682
Charge-offs											-2,097		-2,683		-6,191
Recoveries											462		272		963
Provision											1,586		4,572		7,007
Ending balance	15,573					15,622					15,573		15,622		13,461
Ending balance: individually evaluated for impairment	412					1,150					412		1,150		1,084
Ending balance: collectively evaluated for impairment	15,161					14,472					15,161		14,472		12,377
Financing receivables ending balance:
Collectively evaluated for impairment	856,185					775,053					856,185		775,053		678,936
Individually evaluated for impairment	4,654					9,148					4,654		9,148		8,575
Purchase credit impaired loans	0					1					0		1		0
Total loans	860,839					784,202					860,839		784,202		687,511
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					24,541					22,598	24,541		22,598		23,514
Charge-offs											-5,454		-3,587		-4,348
Recoveries											404		206		188
Provision											6,382		5,324		3,244
Ending balance	25,873					24,541					25,873		24,541		22,598
Ending balance: individually evaluated for impairment	197					765					197		765		516
Ending balance: collectively evaluated for impairment	25,676					23,776					25,676		23,776		22,082
Financing receivables ending balance:
Collectively evaluated for impairment	2,304,099					2,191,132					2,304,099		2,191,132		2,066,432
Individually evaluated for impairment	30,729					39,516					30,729		39,516		33,868
Purchase credit impaired loans	12,495					18,612					12,495		18,612		21,853
Total loans	2,347,323					2,249,260					2,347,323		2,249,260		2,122,153
Commercial Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					3,371					2,811	3,371		2,811		2,076
Charge-offs													-308
Recoveries													100
Provision											574		768		735
Ending balance	3,945					3,371					3,945		3,371		2,811
Ending balance: collectively evaluated for impairment	3,945					3,371					3,945		3,371		2,811
Financing receivables ending balance:
Collectively evaluated for impairment	265,501					223,562					265,501		223,562		188,768
Individually evaluated for impairment	311					100					311		100
Purchase credit impaired loans	182					197					182		197		0
Total loans	265,994					223,859					265,994		223,859		188,768
Small Business [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					1,215					1,524	1,215		1,524		1,896
Charge-offs											-605		-773		-616
Recoveries											275		279		134
Provision											286		185		110
Ending balance	1,171					1,215					1,171		1,215		1,524
Ending balance: individually evaluated for impairment	7					109					7		109		353
Ending balance: collectively evaluated for impairment	1,164					1,106					1,164		1,106		1,171
Financing receivables ending balance:
Collectively evaluated for impairment	84,159					75,337					84,159		75,337		76,315
Individually evaluated for impairment	1,088					1,903					1,088		1,903		2,279
Purchase credit impaired loans	0					0					0		0		0
Total loans	85,247					77,240					85,247		77,240		78,594
Residential Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					2,760					2,930	2,760		2,930		3,113
Charge-offs											-826		-622		-1,094
Recoveries											424		143		151
Provision											476		309		760
Ending balance	2,834					2,760					2,834		2,760		2,930
Ending balance: individually evaluated for impairment	1,500					1,564					1,500		1,564		1,302
Ending balance: collectively evaluated for impairment	1,334					1,196					1,334		1,196		1,628
Financing receivables ending balance:
Collectively evaluated for impairment	505,799					515,854					505,799		515,854		587,687
Individually evaluated for impairment	15,055					15,200					15,055		15,200		15,373
Purchase credit impaired loans	9,405					10,389					9,405		10,389		9,821
Total loans	530,259					541,443					530,259		541,443		612,881
Home Equity [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					5,036					7,703	5,036		7,703		4,597
Charge-offs											-750		-1,370		-3,178
Recoveries											249		135		93
Provision											421		-1,432		6,191
Ending balance	4,956					5,036					4,956		5,036		7,703
Ending balance: individually evaluated for impairment	262					116					262		116		35
Ending balance: collectively evaluated for impairment	4,694					4,920					4,694		4,920		7,668
Financing receivables ending balance:
Collectively evaluated for impairment	858,305					816,925					858,305		816,925		797,334
Individually evaluated for impairment	5,330					4,890					5,330		4,890		4,435
Purchase credit impaired loans	228					326					228		326		380
Total loans	863,863					822,141					863,863		822,141		802,149
Consumer Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance					694					807	694		807		1,382
Charge-offs											-1,215		-1,175		-1,165
Recoveries											591		588		581
Provision											678		474		9
Ending balance	748					694					748		694		807
Ending balance: individually evaluated for impairment	38					70					38		70		130
Ending balance: collectively evaluated for impairment	710					624					710		624		677
Financing receivables ending balance:
Collectively evaluated for impairment	16,335					18,845					16,335		18,845		24,826
Individually evaluated for impairment	868					1,298					868		1,298		2,129
Purchase credit impaired loans	5					19					5		19		0
Total loans	$17,208					$20,162					$17,208		$20,162		$26,955
[1]	The amount of net deferred fees included in the ending balance was $2.8 million, $2.3 million, and $3.1 million at December 31, 2014, 2013, and 2012, respectively.

Internal_Risk_Rating_Categorie

Internal Risk Rating Categories for Commercial Portfolio (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Internal risk-rating categories for the Company's commercial portfolio
Total	$3,559,403	$3,334,561
Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	860,839	784,202
Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,347,323	2,249,260
Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	265,994	223,859
Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	85,247	77,240
Pass [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	3,327,638	3,087,877
Pass [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	801,578	736,996
Pass [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,196,109	2,068,995
Pass [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	248,696	210,372
Pass [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	81,255	71,514
Potential weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	138,570	125,464
Potential weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	37,802	21,841
Potential weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	82,372	91,984
Potential weakness [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	15,464	8,608
Potential weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,932	3,031
Definite weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	90,595	117,507
Definite weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	20,241	24,409
Definite weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	67,571	85,767
Definite weakness [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	1,834	4,779
Definite weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	949	2,552
Parital loss probable [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,600	3,713
Parital loss probable [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	1,218	956
Parital loss probable [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	1,271	2,514
Parital loss probable [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total		100
Parital loss probable [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	111	143
Definite loss [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	0	0
Definite loss [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	0	0
Definite loss [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	0	0
Definite loss [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	0	0
Definite loss [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	$0	$0

Weighted_Average_FICO_Scores_w

Weighted Average FICO Scores & weighted Average Combined LTV Ratios (Details)	Dec. 31, 2014		Dec. 31, 2013
	score		score
Residential Portfolio Segment [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	739	[1]	738	[1]
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	67.10%	[2]	67.00%	[2]
Home Equity [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	764	[1]	763	[1]
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	53.60%	[2]	53.00%	[2]
[1]	The average FICO scores above are based upon rescores available from November and origination score data for loans booked between December 1 and December 31, for the years indicated.
[2]	(2)The combined LTV ratios for December 31, 2014 and 2013 are based upon updated automated valuations as of February 28, 2013 and actual score data for loans booked from March 1, 2013 through December 31, 2014. For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.

Summary_of_Nonaccrual_Loans_De

Summary of Nonaccrual Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$27,393	$34,134
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	2,822	4,178
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	7,279	11,734
Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	311	100
Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	246	633
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	8,697	10,329
Home Equity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	8,038	7,068
Consumer - Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		$92

Age_Analysis_of_Past_Due_Finan

Age Analysis of Past Due Financing receivables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	loan	loan
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	112	209
Principal Balance 30-59 Days	$20,609	$15,925
Number of Loans 60-89 Days	47	60
Principal Balance 60-89 Days	4,725	3,498
Number of Loans 90 Days or More	110	161
Principal Balance 90 Days or More	14,270	21,116
Number of Loans Total Past Due	269	430
Principal Balance Total Past Due	39,604	40,539
Current	4,931,129	4,677,768
Loans Receivable, Gross, Commercial, Construction	265,994	223,859
Loans Receivable, Gross, Commercial and Industrial	860,839	784,202
Loans and Leases Receivable, Gross, Consumer, Other	17,208	20,162
Loans Receivable, Gross, Commercial, Mortgage	2,347,323	2,249,260
Loans and Leases Receivable, Gross, Consumer, Mortgage	530,259	541,443
Small Business	85,247	77,240
Total Financing Receivables	4,970,733	4,718,307
Recorded Investment >90 Days and Accruing	119	525
Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	18	9
Principal Balance 30-59 Days	3,192	743
Number of Loans 60-89 Days	10	6
Principal Balance 60-89 Days	1,007	327
Number of Loans 90 Days or More	19	20
Principal Balance 90 Days or More	2,320	3,763
Number of Loans Total Past Due	47	35
Principal Balance Total Past Due	6,519	4,833
Current	854,320	779,369
Total Financing Receivables	860,839
Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	19	21
Principal Balance 30-59 Days	13,428	8,643
Number of Loans 60-89 Days	6	2
Principal Balance 60-89 Days	1,480	356
Number of Loans 90 Days or More	16	30
Principal Balance 90 Days or More	4,225	8,155
Number of Loans Total Past Due	41	53
Principal Balance Total Past Due	19,133	17,154
Current	2,328,190	2,232,106
Total Financing Receivables	2,347,323
Commercial Construction [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	1	1
Principal Balance 30-59 Days	506	847
Number of Loans 90 Days or More	1	1
Principal Balance 90 Days or More	311	100
Number of Loans Total Past Due	2	2
Principal Balance Total Past Due	817	947
Current	265,177	222,912
Total Financing Receivables	265,994
Small Business [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	7	18
Principal Balance 30-59 Days	21	353
Number of Loans 60-89 Days	8	6
Principal Balance 60-89 Days	113	227
Number of Loans 90 Days or More	7	14
Principal Balance 90 Days or More	173	247
Number of Loans Total Past Due	22	38
Principal Balance Total Past Due	307	827
Current	84,940	76,413
Total Financing Receivables	85,247
Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	13	23
Principal Balance 30-59 Days	1,670	2,903
Number of Loans 60-89 Days	10	8
Principal Balance 60-89 Days	1,798	1,630
Number of Loans 90 Days or More	36	39
Principal Balance 90 Days or More	4,826	6,648
Number of Loans Total Past Due	59	70
Principal Balance Total Past Due	8,294	11,181
Current	521,965	530,262
Total Financing Receivables	530,259
Recorded Investment >90 Days and Accruing	106	462
Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	20	27
Principal Balance 30-59 Days	1,559	1,922
Number of Loans 60-89 Days	7	8
Principal Balance 60-89 Days	307	852
Number of Loans 90 Days or More	23	23
Principal Balance 90 Days or More	2,402	2,055
Number of Loans Total Past Due	50	58
Principal Balance Total Past Due	4,268	4,829
Current	859,595	817,312
Total Financing Receivables	863,863	822,141
Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	34	110
Principal Balance 30-59 Days	233	514
Number of Loans 60-89 Days	6	30
Principal Balance 60-89 Days	20	106
Number of Loans 90 Days or More	8	34
Principal Balance 90 Days or More	13	148
Number of Loans Total Past Due	48	174
Principal Balance Total Past Due	266	768
Current	16,942	19,394
Total Financing Receivables	17,208
Recorded Investment >90 Days and Accruing	$13	$63

TDRs_and_Other_Pertinent_Infor

TDR's and Other Pertinent Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of Troubled Debt Restructurings and other pertinent information
TDRs on accrual status	$38,382	$38,410
TDRs on nonaccrual status	5,248	7,454
Total TDRs	43,630	45,864
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	2,004	2,474
Additional commitments to lend to a borrower who has been a party to a TDR:	$1,400	$1,877

Modification_which_Occurred_Du

Modification which Occurred During the Period & Change in Recorded Investment(Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
	contract		contract		contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	51		67		120
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$7,609		$13,163		$16,132
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	7,645	[1]	13,189	[1]	16,140	[1]
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	12		11		18
Financing Receivable, Modifications, Pre-Modification Recorded Investment	681		732		3,372
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	681	[1]	732	[1]	3,372	[1]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	13		9		15
Financing Receivable, Modifications, Pre-Modification Recorded Investment	4,329		8,100		7,121
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	4,329	[1]	8,100	[1]	7,121	[1]
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	5		12		14
Financing Receivable, Modifications, Pre-Modification Recorded Investment	133		556		621
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	133	[1]	556	[1]	621	[1]
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	9		9		20
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,535		2,401		3,495
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	1,568	[1]	2,427	[1]	3,499	[1]
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	11		17		20
Financing Receivable, Modifications, Pre-Modification Recorded Investment	923		1,347		1,195
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	926	[1]	1,347	[1]	1,198	[1]
Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1		9		33
Financing Receivable, Modifications, Pre-Modification Recorded Investment	8		27		328
Change in investment recorded subsequent to modifications
Post-Modification Outstanding Recorded Investment	$8	[1]	$27	[1]	$329	[1]
[1]	The post-modification balances represent the balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.

Postmodification_balance_of_TD

Post-modification balance of TDRs Listed by type of Modification(Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Extended maturity	$3,441	$3,582	$5,867
Adjusted interest rate	727	0	2,182
Combination rate & maturity	2,640	8,917	5,007
Court ordered concession	837	690	3,084
Total	$7,645	$13,189	$16,140

TDRs_that_have_subsequent_defa

TDR's that have subsequent default (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	contract	contract	contract
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment	$410	$177	$1,165
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	2	5
Commercial and Industrial [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment	196	0	231
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	1
Commercial Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment	0	176	696
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1	3
Residential Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment	214	0	238
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	0	1
Consumer - Other [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment			0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0
Consumer Loan [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment	$0	$1
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1

Imparied_Loan_Information_by_P

Imparied Loan Information by Portfolio (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impaired loans by loan portfolio
Related Allowance	$2,416	$3,774	$3,420
Recorded Investment	58,035	72,055	66,659
Unpaid Principal Balance	61,887	75,817	70,649
Average Recorded Investment	62,202	76,523	70,595
Interest Income Recognized	3,242	3,968	4,011
With No Related Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment	26,936	29,685	27,297
Unpaid Principal Balance	28,535	32,186	29,689
Average Recorded Investment	29,464	32,896	29,831
Interest Income Recognized	1,665	1,915	1,808
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment	3,005	7,147	5,849
Unpaid Principal Balance	3,278	7,288	7,343
Average Recorded Investment	4,557	7,338	6,993
Interest Income Recognized	258	338	391
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	15,982	14,283	12,999
Unpaid Principal Balance	17,164	15,891	13,698
Average Recorded Investment	16,703	15,728	13,984
Interest Income Recognized	1,025	1,075	952
With No Related Allowance Recorded [Member] | Commercial Construction [Member]
Impaired loans by loan portfolio
Recorded Investment	311	100
Unpaid Principal Balance	311	408
Average Recorded Investment	311	1,105
Interest Income Recognized	13	43
With No Related Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment	692	1,474	1,085
Unpaid Principal Balance	718	1,805	1,147
Average Recorded Investment	772	1,854	1,217
Interest Income Recognized	45	121	80
With No Related Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	2,439	1,972	2,545
Unpaid Principal Balance	2,502	2,026	2,630
Average Recorded Investment	2,493	2,021	2,589
Interest Income Recognized	102	95	118
With No Related Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment	4,169	4,263	4,119
Unpaid Principal Balance	4,221	4,322	4,166
Average Recorded Investment	4,264	4,335	4,190
Interest Income Recognized	198	202	195
With No Related Allowance Recorded [Member] | Consumer - Other [Member]
Impaired loans by loan portfolio
Recorded Investment	338	446	700
Unpaid Principal Balance	341	446	705
Average Recorded Investment	364	515	858
Interest Income Recognized	24	41	72
With Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment	31,099	42,370	39,362
Unpaid Principal Balance	33,352	43,631	40,960
Related Allowance	2,416	3,774	3,420
Average Recorded Investment	32,738	43,627	40,764
Interest Income Recognized	1,577	2,053	2,203
With Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment	1,649	2,001	2,726
Unpaid Principal Balance	1,859	2,045	2,851
Related Allowance	412	1,150	1,084
Average Recorded Investment	2,032	2,572	2,883
Interest Income Recognized	98	125	143
With Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	14,747	25,233	20,869
Unpaid Principal Balance	15,514	25,377	21,438
Related Allowance	197	765	516
Average Recorded Investment	15,650	25,595	21,678
Interest Income Recognized	842	1,326	1,340
With Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment	396	429	1,194
Unpaid Principal Balance	458	462	1,228
Related Allowance	7	109	353
Average Recorded Investment	456	459	1,255
Interest Income Recognized	32	28	77
With Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment	12,616	13,228	12,828
Unpaid Principal Balance	13,727	14,197	13,601
Related Allowance	1,500	1,564	1,302
Average Recorded Investment	12,817	13,405	13,014
Interest Income Recognized	537	515	560
With Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment	1,161	627	316
Unpaid Principal Balance	1,264	694	389
Related Allowance	262	116	35
Average Recorded Investment	1,203	642	324
Interest Income Recognized	46	26	23
With Allowance Recorded [Member] | Consumer - Other [Member]
Impaired loans by loan portfolio
Recorded Investment	530	852	1,429
Unpaid Principal Balance	530	856	1,453
Related Allowance	38	70	130
Average Recorded Investment	580	954	1,610
Interest Income Recognized	$22	$33	$60

LOANS_ALLOWANCE_FOR_LOAN_LOSSE2

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details 10) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Nov. 15, 2013	Dec. 31, 2012	Nov. 09, 2012
In Thousands, unless otherwise specified
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Contractually required principal and interest payments receivable			$4,440		$47,548	[1]
Less: expected cash flows			3,144		38,815	[1]
Initial nonaccretable difference			1,296		8,733
Expected cash flows			3,144		38,815	[1]
Less: fair value (initial carrying amount)			2,758		35,720
Accretable Yield	$2,974	$2,514	$386	$2,464	$3,095
[1]	Reflective of anticipated prepayments.

Purchased_Credit_Impaired_Loan

Purchased Credit Impaired Loans - Outstanding/Carrying Balance (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Nov. 15, 2013	Nov. 09, 2012
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$2,514	$2,464	$386	$3,095
Acquisition	0	386
Accretion	-2,299	1,812
Certainloansacquiredintransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	2,565	1,142
Reclassification from nonaccretable difference for loans with improved cash flows	194	334
Beginning balance	$2,974	$2,514	$386	$3,095

Loans_to_Insiders_Details

Loans to Insiders (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Loans and Leases Receivable, Related Parties [Roll Forward]
Principal balance of loans outstanding at beginning of year	$52,510		$47,859
Loan advances	21,310		107,461
Loan payments/payoffs	-21,913	[1]	-102,810	[1]
Loans and Leases Receivable, Related Parties, Period Increase (Decrease)	-25,913	[1]
Principal balance of loans outstanding at end of year	$25,994		$52,510
[1]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmZiMWQwZTk4NmU5YjQ1ZjU5NjhjMjAyM2ExYzdkYzM0fFRleHRTZWxlY3Rpb246OEZFNjBCNDU0QTlFQUU1ODhGMkZBOTlBQUVGRjgxNjYM}

LOANS_ALLOWANCE_FOR_LOAN_LOSSE3

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Days To Be Termed As Non Accrual Loans	90 days
The amount of deferred fees	$2,800,000	$2,300,000	$3,100,000
Significant advanced considered for risk rating change	50,000
TDRs on nonaccrual status	$5,248,000	$7,454,000

LOANS_ALLOWANCE_FOR_LOAN_LOSSE4

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Activity in the Accretable Yield PCI Loans(Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Outstanding and Carrying Amounts of Purchase Credit Impaired Loans [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$25,279	$33,555
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$22,315	$29,544

BANK_PREMISES_AND_EQUIPMENT_De

BANK PREMISES AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total cost	$119,902,000	$115,686,000
Accumulated depreciation	-55,828,000	-50,736,000
Net bank premises and equipment	64,074,000	64,950,000
Depreciation expense	6,600,000	6,100,000	5,500,000
Impairment of Long-Lived Assets to be Disposed of	670,000	93,000
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	15,786,000	16,026,000
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Total cost	33,425,000	32,858,000
Bank Premises [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Bank Premises [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	20,797,000	20,189,000
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$49,894,000	$46,613,000
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years

GOODWILL_AND_IDENTIFIABLE_INTA2

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Goodwill	$170,421	$170,421	$150,391	$130,074
Other Intangible Assets	9,885	12,221
Total goodwill and other intangible assets	180,306	182,642
Core deposit intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	9,269	11,218
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$616	$1,003

GOODWILL_AND_IDENTIFIABLE_INTA3

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2013	Dec. 31, 2014	Nov. 15, 2013	Nov. 09, 2012
Goodwill [Roll Forward]
Balance at beginning of year	$130,074			$170,421
Impairment	-2,227	[1]
Balance at end of year	150,391		170,421	170,421
Mayflower Bankcorp, Inc. [Member]
Goodwill [Roll Forward]
Balance at beginning of year					20,030
Acquisitions	22,544
Balance at end of year					20,030
Central Bankcorp, Inc. [Member]
Goodwill [Roll Forward]
Balance at beginning of year						22,544
Acquisitions			20,030
Balance at end of year						$22,544
[1]	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.

GOODWILL_AND_IDENTIFIABLE_INTA4

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$22,087	$22,087
Accumulated Amortization	-12,202	-9,866
Net Carrying Amount	9,885	12,221
Core deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,147	20,147
Accumulated Amortization	-10,878	-8,929
Net Carrying Amount	9,269	11,218
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,940	1,940
Accumulated Amortization	-1,324	-937
Net Carrying Amount	$616	$1,003

GOODWILL_AND_IDENTIFIABLE_INTA5

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 3) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	$2,175
2016	2,082
2017	2,061
2018	1,315
2019	$704

GOODWILL_AND_IDENTIFIABLE_INTA6

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment			$2,227,000	[1]
Amortization of intangible assets	$2,300,000	$2,100,000	$1,700,000
Weighted average amortization period for intangible assets	9 years 10 months 24 days
[1]	Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.

DEPOSITS_Details

DEPOSITS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Time Deposits, Fiscal Year Maturity [Abstract]
1 year or less	$462,506,000	$559,402,000
Over 1 year to 2 years	102,385,000	87,645,000
Over 2 years to 3 years	29,044,000	51,778,000
Over 3 years to 4 years	26,156,000	20,462,000
Over 4 years to 5 years	29,529,000	24,288,000
Over 5 years	0	53,000
Time Deposits	649,620,000	743,628,000
1 year or less (as percent)	71.20%	75.10%
Over 1 years to 2 years (as percent)	15.80%	11.80%
Over 2 years to 3 years (as percent)	4.50%	7.00%
Over 3 years to 4 years (as percent)	4.00%	2.80%
Over 4 years to 5 years (as percent)	4.50%	3.30%
Over 5 years (as percent)	0.00%	0.00%
Time Deposits (as percent)	100.00%	100.00%
Overdraft deposits reclassified to the loan category	$3,500,000	$2,400,000

BORROWINGS_FHLB_Advances_Detai

BORROWINGS (FHLB Advances) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Repayments of Federal Home Loan Bank Borrowings	$60,000,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months	38,001,000	105,027,000
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	0.69%	0.55%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two	0	3,074,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date	0.00%	5.81%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three	31,203,000	0
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date	4.03%	0.00%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four	0	31,290,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Three to Four Years from Balance Sheet Date	0.00%	4.02%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five	0	0
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Four to Five Years from Balance Sheet Date	0.00%	0.00%
Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five		0
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, after Five Years from Balance Sheet Date		0.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	69,204,000	139,391,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate	2.20%	1.44%
Debt Instrument, Unamortized Premium	876,000	903,000
Total Federal Home Loan Bank Advances	$70,080,000	$140,294,000

BORROWINGS_ShortTerm_Borrowing

BORROWINGS (Short-Term Borrowings) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Short-term Debt [Line Items]
Line of credit amount outstanding	$0	$5,000
Short-term Debt	147,890	154,288
Customer Repurchase Agreements [Member]
Short-term Debt [Line Items]
Customer Repurchase Agreements	$147,890	$149,288

BORROWINGS_Additional_Informat

BORROWINGS (Additional Information on other short-term borrowings) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional Information on other Short-Term Borrowings [Line Items]
Balance outstanding at end of year, amount	$147,890	$154,288
Customer Repurchase Agreements [Member]
Additional Information on other Short-Term Borrowings [Line Items]
Balance outstanding at end of year, amount	147,890	149,288	153,359
Balance outstanding at end of year, weighted average interest rate	0.13%	0.13%	0.13%
Average daily balance outstanding	143,700	147,195	160,589
Average daily balance outstanding, weighted average interest rate	0.13%	0.13%	0.20%
Maximum balance outstanding at any month end	$160,317	$164,180	$178,171

BORROWINGS_LongTerm_Debt_Detai

BORROWINGS (Long-Term Debt) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Long-Term Borrowings	$188,685	$153,906
Wholesale Repurchase Agreements [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	50,000	50,000
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	51,547	51,547
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	10,310	10,310
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	5,258	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	6,570	6,791
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$65,000	$30,000

BORROWINGS_Trust_Preferred_Sec

BORROWINGS (Trust Preferred Securities) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2013
Debt Instrument [Line Items]
Face Amount	71	$71
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	50
Fixed rate	6.52%
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Face Amount	10
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.79%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Face Amount	5.1
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.44%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	5.9
Fixed rate	7.02%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Subordinated Debt [Member] | Subordinated Debentures Due in October 2019 [Member]
Debt Instrument [Line Items]
Fixed rate			7.02%
Subordinated Debt [Member] | Subordinated Debentures Due in October 2019 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Subordinated Debt [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.98%

BORROWINGS_Maturities_of_LongT

BORROWINGS (Maturities of Long-Term Debt) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Wholesale Repurchase Agreements [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	$50,000
2016	0
2017	0
2018	0
2019	0
Thereafter	0
Total	50,000
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	51,547
Total	51,547
Junior Subordinated Debentures [Member] | Slades Ferry Trust I Preferred Securities Due in 2034 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	10,310
Total	10,310
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	5,258
Total	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	6,570
Total	6,570
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	30,000
Thereafter	35,000
Total	$65,000

BORROWINGS_Details_Textual

BORROWINGS (Details Textual) (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	Aug. 31, 2013	Nov. 15, 2019
Debt Instrument [Line Items]
Interest Expense, Long-term Debt									$6,400,000	$7,000,000	$7,100,000
Gains (Losses) on Extinguishment of Debt	0	0	0	0	0	763,000	0	0	0	763,000	0
Loss on termination of derivatives	0	0	1,122,000	0	0	0	0	0	1,100,000
Interest expense on short-term borrowings									200,000	276,000	363,000
Total Long-Term Borrowings	188,685,000				153,906,000				188,685,000	153,906,000
Wholesale Repurchase Agreements [Member]
Debt Instrument [Line Items]
Repurchase Agreements, Investments Pledged	52,900,000				50,100,000				52,900,000	50,100,000
Total Long-Term Borrowings	50,000,000				50,000,000				50,000,000	50,000,000
Subordinated Debentures [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate									3.00%
Subordinated Debentures Due in October 2019 [Member] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Fixed rate												7.02%
Subordinated Debentures Due in October 2019 [Member] | Subordinated Debentures [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate									3.00%
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate									2.98%
Line of Credit [Member] | Line of Credit Borrowing After 2013 Amendment [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	20,000,000								20,000,000
Line of Credit [Member] | Line of Credit Borrowing Before 2013 Amendment [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	10,000,000								10,000,000
Customer [Member]
Debt Instrument [Line Items]
Repurchase Agreements, Investments Pledged	156,900,000				169,000,000				156,900,000	169,000,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal home loan bank unused remaining available borrowing capacity	755,700,000				668,100,000				755,700,000	668,100,000
Line of credit maximum borrowing capacity	5,000,000								5,000,000
Swap [Member] | Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
FHLB advances amount hedged	$25,000,000		$75,000,000		$100,000,000				$25,000,000	$100,000,000
Derivative weighted average interest rate	2.94%				2.68%				2.94%	2.68%
Scenario, Forecast [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Fixed rate													4.75%

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (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
Earnings Per Share [Abstract]
Net income	$15,978	$15,738	$14,746	$13,383	$10,588	$14,655	$12,758	$12,252	$59,845	$50,254	$42,627
Weighted Average Shares (in shares)
Basic Shares (in shares)	23,968,320	23,911,678	23,897,413	23,819,065	23,383,608	22,946,308	22,888,155	22,823,753	23,899,562	23,011,814	21,782,499
Effect of dilutive securities (in shares)	86,812	90,685	94,560	100,173	97,445	100,806	52,144	46,040	93,815	76,764	29,817
Weighted average common shares (diluted) (in shares)	24,055,132	24,002,363	23,991,973	23,919,238	23,481,053	23,047,114	22,940,299	22,869,793	23,993,377	23,088,578	21,812,316
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$0.67	$0.66	$0.62	$0.56	$0.45	$0.64	$0.56	$0.54	$2.50	$2.18	$1.96
Effect of Dilutive Securities (in dollars per share)									($0.01)		($0.01)
Diluted EPS (in dollars per share)	$0.66	$0.66	$0.61	$0.56	$0.45	$0.64	$0.56	$0.54	$2.49	$2.18	$1.95

EARNINGS_PER_SHARE_Details_1

EARNINGS PER SHARE (Details 1)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance-based Restricted Shares [Member]
Details of anti dilutive options to purchase common stock
Stock options	0	0	0
Stock Options or Restricted Stock [Member]
Details of anti dilutive options to purchase common stock
Stock options	0	124,608	584,938

CUMULATIVELY_GRANTED_AWARDS_De

CUMULATIVELY GRANTED AWARDS (Details)	Dec. 31, 2014
1996 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	300,000
Cumulative Granted, Net of Forfeitures	190,000
1996 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	300,000
Cumulative Granted, Net of Forfeitures	190,000
1997 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	1,100,000
Cumulative Granted, Net of Forfeitures	972,271
1997 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	1,100,000
Cumulative Granted, Net of Forfeitures	972,271
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	1,650,000	[1]
Cumulative Granted, Net of Forfeitures	1,088,984
Authorized but Unissued	561,016
2005 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	537,941
2005 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	551,043
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	35,400	[2]
Cumulative Granted, Net of Forfeitures	35,400
2006 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	15,000
2006 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	20,400
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	314,600	[3]
Cumulative Granted, Net of Forfeitures	94,220
Authorized but Unissued	220,380
2010 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	27,000
2010 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures	67,220
[1]	The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
[2]	The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
[3]	The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.

PRE_TAX_EXPENSE_Details_1

PRE TAX EXPENSE (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	$2,712		$2,462		$2,845
Related tax benefits recognized in earnings	945		832		932
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	36		241		526
Stock options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	14		27		19
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	2,135	[1]	1,906	[1]	1,968	[1]
Restricted stock awards [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	$527		$288		$332
[1]	Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.

STOCK_OPTION_AWARDS_DURING_PER

STOCK OPTION AWARDS DURING PERIOD (Details 3) (Stock options [Member], USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Weighted average grant date fair value of options granted (per share)	$0		$8.13	$0
11/9/2013 | 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	5,000
Vesting period	13 months	[1]
Expected volatility	31.23%
Expected life (years)	5 years 6 months
Expected dividend yield	2.64%
Risk free interest rate	1.56%
Weighted average grant date fair value of options granted (per share)	$8.13
[1]	Vesting periods begin on the grant date unless otherwise noted.

RELEVANT_STOCK_OPTION_INFORMAT

RELEVANT STOCK OPTION INFORMATION (Details 4) (Stock options [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options vested based on grant date fair value	$211	$430	$706
Intrinsic value of stock options exercised	1,210	1,051	609
Cash received from stock option exercises	6,285	2,475	1,242
Tax benefit realized on stock option exercises/repurchase	442	322	242
Weighted average grant date fair value of options granted (per share)	$0	$8.13	$0
Cash paid to settle equity instruments granted under stock based compensation arrangements	$0	$0	$134

STOCK_OPTION_ROLLFORWARD_Detai

STOCK OPTION ROLLFORWARD (Details 5) (Stock options [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Stock options [Member]
Stock Option Awards, Outstanding (in shares):
Balance outstanding at beginning of period	524,948
Granted	0
Exercised	-193,697
Forfeited	0
Expired	-500
Balance outstanding at end of period	330,751	[1]	524,948
Options outstanding and expected to vest at December 31, 2014	330,750	[1]
Options exercisable at December 31, 2014	329,085	[2]
Weighted Average Exercise Price, Outstanding (in usd per share):
Balance outstanding at beginning of period	$30.50
Granted	$0
Exercised	$32.45
Forfeited	$0
Expired	$31.44
Balance outstanding at end of period	$29.36		$30.50
Options outstanding and expected to vest at December 31, 2014	$29.36
Options exercisable at December 31, 2014	$29.33
Balance at December 31, 2013, Weighted average remaining contractual term (years)	3 years 7 months 26 days
Options outstanding and expected to vest at December 31, 2013, Weighted Average Remaining Contractual Term (years)	3 years 7 months 26 days
Options exercisable at December 31, 2013, Weighted Average Remaining Contractual Term (years)	3 years 7 months 17 days
Balance at December 31, 2013, Aggregate Intrinsic Value	$4,548	[3]
Options outstanding and expected to vest at December 31, 2013, Aggregate Instrinsic Value	4,548	[3]
Options exercisable at December 31, 2013, Aggregate Intrinsic Value	4,535	[3]
Stock Option Awards, Nonvested (in shares)
Balance nonvested at beginning of period	33,487
Granted	0
Vested	-31,821
Forfeited	0
Expired	0
Balance nonvested at end of period	1,666	[4]	33,487
Weighted Average Grant Date Fair Value, Nonvested (in dollars per share):
Balance nonvested at beginning of period	$6.71
Granted	$0		$8.13	$0
Vested	$6.64
Forfeited	$0
Expired	$0
Balance nonvested at end of period	$8.13		$6.71
Unrecognized compensation cost, including forfeiture estimate	$0
Weighted average remaining recognition period (years)	0 months 2 days
[1]	Inclusive of 28,999 stock options outstanding and expected to vest to Directors.
[2]	Inclusive of 27,334 vested stock options outstanding to Directors.
[3]	The aggregate intrinsic value in the preceding tables represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2014 of $43.11 which would have been received by the option holders had they all exercised their options as of that date.
[4]	Inclusive of 1,666 nonvested stock options outstanding to Directors.

RSA_GRANTS_Details_6

RSA GRANTS (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$39.31
Restricted stock awards [Member] | 2010 Plan [Member] | 5/20/2014 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	10,920
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$35.08
Vesting terms	At the end of 5 years from grant date(2)
Restricted stock awards [Member] | 2010 Plan [Member] | 5/21/2013 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			14,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$33.17
Vesting terms			At the end of 5 years from grant date(2)
Restricted stock awards [Member] | 2010 Plan [Member] | 5/22/2012 | indb_immediately [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$27.63	[1]
Vesting terms				Immediate upon grant
Restricted stock awards [Member] | 2010 Plan [Member] | 5/22/2012 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				13,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$27.63	[1]
Vesting terms				At the end of 5 years from grant date(2)	[2]
Restricted stock awards [Member] | 2010 Plan [Member] | 11/10/2012 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$28.03	[1]
Vesting terms				At the end of 5 years from grant date(2)	[2]
Restricted stock awards [Member] | 2005 Plan [Member] | 3/20/2014 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	65,950
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$39.82
Vesting terms	Ratably over 5 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 3/31/2014 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	3,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$39
Vesting terms	Ratably over 3 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 11/20/2014 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$39.11
Vesting terms	Ratably over 5 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 12/11/2014 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$40.89
Vesting terms	Ratably over 5 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 1/16/2013 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			2,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$30.48
Vesting terms			Ratably over 3 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 2/14/2013 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			93,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$31.51
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 2/16/2012 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				89,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$27.81	[1]
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | 2005 Plan [Member] | 4/5/2012 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				1,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$28.16	[1]
Vesting terms				Ratably over 5 years from grant date
Performance-based Restricted Shares [Member] | 2005 Plan [Member] | 3/20/2014 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	20,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$39.82	[1]
Vesting terms	On March 20, 2017, if performance conditions are met
[1]	The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.
[2]	These restricted stock grants will vest at the end of a five year period, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement. If a non-employee director is removed from the Board for cause, the Company has ninety (90) days within which to exercise a right to repurchase any unvested portion of any restricted stock award from the non-employee director for the aggregate price of one dollar ($1.00).

FV_OF_RSA_VESTS_Details_7

FV OF RSA VESTS (Details 7) (Restricted stock awards [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock awards upon vesting	$3,293	$3,289	$2,085

RSA_ROLLFORWARD_Details_8

RSA ROLLFORWARD (Details 8) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Oustanding (in shares):
Beginning balance			268,290
Ending balance	254,500		268,290
Restricted stock awards [Member]
Oustanding (in shares):
Beginning balance	271,927
Granted	104,570
Vested/Released	-91,507
Forfeited	-8,463
Ending balance	276,527	[1]
Weighted Average Grant Price (in usd per share):
Beginning balance	$28.39
Granted	$39.31
Vested/Released	$26.30
Forfeited	$30.21
Ending balance	$33.15
Unrecognized compensation cost (inclusive of directors’ fees), including forfeiture estimate	$6,644
Weighted average remaining recognition period (years)	3 years 1 month 25 days
[1]	Inclusive of 34,600 restricted stock awards outstanding to Directors.

STOCK_BASED_COMPENSATION_Detai

STOCK BASED COMPENSATION (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2012	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	254,500			268,290
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value	43.11
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and expected to vest at December 31, 2014	330,750	[1]
Annualized estimated forfeitures	3.50%
Options exercisable at December 31, 2014	329,085	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	1,666	[3]		33,487
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	276,527	[4]		271,927
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and expected to vest at December 31, 2014	28,999
Options exercisable at December 31, 2014	27,334
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	1,666
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	34,600
Two Thousand Five Amended and Restated Employee Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,650,000	[5]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	561,016
Two Thousand Five Amended and Restated Employee Stock Plan [Member] | Stock Options or Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,650,000
Two Thousand Six Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	35,400	[6]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Transferred From (To) Another Plan			-14,600
Two Thousand Six Nonemployee Director Stock Plan [Member] | Stock Options or Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	50,000
Nineteen Ninety-Six Nonemployee Directors' Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Nineteen Ninety-Six Nonemployee Directors' Stock Option Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Two Thousand Ten Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	314,600	[7]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	220,380
Two Thousand Ten Nonemployee Director Stock Plan [Member] | Stock Options or Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	314,600
Two Thousand Ten Nonemployee Director Stock Plan [Member] | Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
[1]	Inclusive of 28,999 stock options outstanding and expected to vest to Directors.
[2]	Inclusive of 27,334 vested stock options outstanding to Directors.
[3]	Inclusive of 1,666 nonvested stock options outstanding to Directors.
[4]	Inclusive of 34,600 restricted stock awards outstanding to Directors.
[5]	The Company may award up to a total of 1,650,000 shares as stock options or restricted stock awards.
[6]	The Company may award up to a total of 50,000 shares as stock options or restricted stock awards. During 2010, the remaining 14,600 shares were transferred and available for issue under the 2010 Plan.
[7]	The Company may award up to a total of 314,600 shares as stock options or restricted stock awards, inclusive of 14,600 shares which were transferred from the 2006 Plan.

Recovered_Sheet1

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	$75,000,000	$150,000,000
Fair Value	-5,570,000	-9,630,000
Positions One [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	25,000,000	25,000,000
Trade Date	16-Feb-06	16-Feb-06
Effective Date	28-Dec-06	28-Dec-06
Maturity Date	28-Dec-16	28-Dec-16
Receive (Variable) Index	3 Month LIBOR	3 Month LIBOR
Current Rate Received	0.24%	0.24%
Pay Fixed Swap Rate	5.04%	5.04%
Fair Value	-2,093,000	-3,151,000
Positions Two [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	25,000,000	25,000,000
Trade Date	16-Feb-06	16-Feb-06
Effective Date	28-Dec-06	28-Dec-06
Maturity Date	28-Dec-16	28-Dec-16
Receive (Variable) Index	3 Month LIBOR	3 Month LIBOR
Current Rate Received	0.24%	0.24%
Pay Fixed Swap Rate	5.04%	5.04%
Fair Value	-2,094,000	-3,152,000
Positions Four [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount	25,000,000	25,000,000
Trade Date	9-Dec-08	9-Dec-08
Effective Date	10-Dec-08	10-Dec-08
Maturity Date	10-Dec-13	10-Dec-13
Receive (Variable) Index	3 Month LIBOR	3 Month LIBOR
Current Rate Received	0.24%	0.24%
Pay Fixed Swap Rate	2.94%	2.94%
Fair Value	-1,383,000	-1,493,000
Positions Six [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount		50,000,000
Trade Date		17-Nov-09
Effective Date		20-Dec-10
Maturity Date		20-Dec-14
Receive (Variable) Index		3 Month LIBOR
Current Rate Received		0.25%
Pay Fixed Swap Rate		3.04%
Fair Value		-1,341,000
Positions Seven [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Notional Amount		25,000,000
Trade Date		5-May-11
Effective Date		10-Jun-11
Maturity Date		10-Jun-15
Receive (Variable) Index		3 Month LIBOR
Current Rate Received		0.24%
Pay Fixed Swap Rate		1.71%
Fair Value		($493,000)

Recovered_Sheet2

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Summary of customer related derivative positions, not designated as hedging
Total	$75,000,000	$150,000,000
Fair Value	-5,570,000	-9,630,000
Not Designated as Hedging Instrument [Member] | Receive fixed, pay variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	174	168
Less than 1 year	88,147,000	48,882,000
Less than 2 years	46,854,000	97,975,000
Less than 3 years	40,958,000	42,957,000
Less than 4 years	38,108,000	42,116,000
Thereafter	403,208,000	329,554,000
Total	617,275,000	561,484,000
Fair Value	17,840,000	9,484,000
Not Designated as Hedging Instrument [Member] | Pay fixed, receive variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	168	162
Less than 1 year	88,147,000	48,882,000
Less than 2 years	46,854,000	97,975,000
Less than 3 years	40,958,000	42,957,000
Less than 4 years	38,108,000	42,116,000
Thereafter	403,208,000	329,554,000
Total	617,275,000	561,484,000
Fair Value	-17,837,000	-9,523,000
Not Designated as Hedging Instrument [Member] | Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	23	6
Less than 1 year	57,112,000	11,367,000
Total	57,112,000	11,367,000
Fair Value	4,007,000	396,000
Not Designated as Hedging Instrument [Member] | Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	23	6
Less than 1 year	57,112,000	11,367,000
Total	57,112,000	11,367,000
Fair Value	($3,984,000)	($390,000)

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	$22,390	$16,697
Total	225,824	225,648
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	22,688	16,965
Total	22,688	16,965
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	22,380	16,765
Total	27,950	26,395
Interest rate derivatives
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	0	0
Total	5,571	9,630
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate derivatives	0
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate derivatives	5,570	9,630
Loan level derivatives
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	18,383	16,301
Total	18,380	16,340
Loan level derivatives | Derivatives not designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Loan level derivatives	18,383	16,301
Loan level derivatives | Derivatives not designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Loan level derivatives	18,380	16,340
Foreign exchange contracts
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	4,007	396
Total	3,984	390
Foreign exchange contracts | Derivatives not designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Foreign exchange contracts	4,007	396
Foreign exchange contracts | Derivatives not designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Foreign exchange contracts	3,984	390
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate lock commitments	295	204
Forward TBA mortgage contracts	0	64
Forward sales agreements	3	0
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate lock commitments	0	0
Forward TBA mortgage contracts	16	0
Forward sales agreements	$0	$35

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain in OCI on derivatives (effective portion), net of tax	($573)	$350	($2,122)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	1,122
Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain in OCI on derivatives (effective portion), net of tax	2,256	3,735	1,082
Loss reclassified from OCI into noninterest expense (loss on termination)	3,662	5,723	5,417
Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	108	276	226
Other Expense [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	-4	-116	-49
Other Income [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	63	38	134
Mortgage banking income | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase Decrease In Fair Value Of Unhedged Derivative Instruments Relating To Residential Loans	$49	$354	$141

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Textual) (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
Derivative [Line Items]
Change in fair value on loans held for sale									$18,000	$1,000	($141,000)
Net amortization income									244,000
Exposure to Institutional Counterparties	272,000				3,400,000				272,000	3,400,000
Maximum length of time Company is currently hedging its exposure	4 years
Interest expense	2,700,000
Customer related positions	18,900,000				13,600,000				18,900,000	13,600,000
Loss on termination of derivatives	$0	$0	$1,122,000	$0	$0	$0	$0	$0	$1,100,000

BALANCE_SHEET_OFFSETTING_Detai

BALANCE SHEET OFFSETTING (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Offsetting Liabilities [Line Items]
Total	$22,390	$16,697
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	22,390	16,697
Derivative, Collateral, Obligation to Return Securities	272	2,823
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	22,118	13,874
Total	225,824	225,648
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	225,824	225,648
Derivative, Collateral, Right to Reclaim Securities	272	2,823
Derivative, Collateral, Right to Reclaim Cash	221,297	219,026
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,255	3,799
Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Total	0	0
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	0	0
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Total	5,571	9,630
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	5,571	9,630
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	5,571	9,630
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Loan level derivatives
Offsetting Liabilities [Line Items]
Total	18,383	16,301
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	18,383	16,301
Derivative, Collateral, Obligation to Return Securities	272	2,823
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	18,111	13,478
Total	18,380	16,340
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	18,380	16,340
Derivative, Collateral, Right to Reclaim Securities	272	2,823
Derivative, Collateral, Right to Reclaim Cash	17,836	10,108
Derivative Liability, Fair Value, Amount Offset Against Collateral	272	3,409
Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Total	4,007	396
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	4,007	396
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,007	396
Total	3,984	390
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	3,984	390
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	3,984	390
Customer Repurchase Agreements [Member]
Offsetting Liabilities [Line Items]
Total	147,890	149,288
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	147,890	149,288
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	147,890	149,288
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Wholesale Repurchase Agreements [Member]
Offsetting Liabilities [Line Items]
Total	50,000	50,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	50,000	50,000
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	50,000	50,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	$0	$0

INCOME_TAXES_Details

INCOME TAXES (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
Current expense
Federal									$14,709	$9,570	$11,928
State									6,350	4,357	4,664
Total current expense									21,059	13,927	16,592
Deferred expense (benefit)
Federal									2,877	1,598	-1,183
State									-37	959	-736
Total deferred expense (benefit)									2,840	2,557	-1,919
Total expense	$6,201	$6,415	$5,934	$5,350	$2,786	$5,299	$4,285	$4,114	$23,899	$16,484	$14,673

INCOME_TAXES_Details_1

INCOME TAXES (Details 1) (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 Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed statutory federal income tax provision									$29,310	$23,359	$20,055
State taxes, net of federal tax benefit									4,104	3,455	2,553
Nontaxable interest, net									-795	-557	-542
New Market Tax Credits									-6,708	-9,000	-6,371
Low Income Housing Project Investments									594	194	196
Increase in cash surrender value of life insurance and tax exempt gain on benefit payments									-1,782	-1,209	-1,612
Merger and other related costs (non-deductible)									274	366	404
Other, net									90	264	382
Total expense	$6,201	$6,415	$5,934	$5,350	$2,786	$5,299	$4,285	$4,114	$23,899	$16,484	$14,673
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Computed statutory federal income tax provision									35.00%	35.00%	35.00%
State taxes, net of federal tax benefit									4.90%	5.17%	4.46%
Nontaxable interest, net									-0.95%	-0.83%	-0.95%
New Market Tax Credits									-8.01%	-13.48%	-11.12%
Low Income Housing Project Investments									-0.71%	-0.29%	-0.34%
Increase in cash surrender value of life insurance and tax exempt gain on benefit payments									-2.13%	-1.81%	-2.81%
Merger and other related costs (non-deductible)									0.33%	0.55%	0.71%
Other, net									0.11%	0.39%	0.66%
Total expense									28.54%	24.70%	25.61%

INCOME_TAXES_Details_2

INCOME TAXES (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Low Income Housing Project Investments	$594	$194	$196
Deferred tax assets
Accrued expenses not deducted for tax purposes	10,666	8,530
Allowance for loan losses	22,462	21,743
Deferred gain on sale leaseback transaction	2,579	3,104
Derivatives fair value adjustment	1,882	3,440
Employee and director equity compensation	2,380	2,351
Federal Home Loan Bank borrowings fair value adjustment	83	220
Loan basis difference fair value adjustment	2,094	1,819
Net operating loss carry-forward	230	1,671
Net unrealized loss on securities available for sale	0	1,418
New Markets Tax Credit carry-forward	521	2,257
Other-than-temporary impairment on securities	4,072	4,074
Other	1,426	1,481
Total	48,395	52,108
Deferred tax liabilities
Core deposit and other intangibles	3,194	4,052
Deferred loan fees, net	4,164	3,530
Fixed assets	4,875	5,571
Goodwill	14,194	13,030
Net unrealized gain on securities available for sale	2,075	0
Other	1,180	956
Total	29,682	27,139
Total net deferred tax asset	$18,713	$24,969

INCOME_TAXES_Details_3

INCOME TAXES (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$55	$126
Reduction of tax positions for prior years	-55	-113
Increase for prior year tax positions	0	42
Increase for current year tax positions	0	0
Ending Balance	$0	$55

INCOME_TAXES_Details_Textual

INCOME TAXES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards	$607,000
Computed statutory federal income tax provision	35.00%	35.00%	35.00%
Tax Credit Carryforward, Amount	$521,000

LOW_INCOME_HOUSING_PROJECT_INV2

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Low Income Housing Project Investments [Abstract]
Original Investment in Low Income Housing Projects	$40,541	$1,701
Investment in Low Income Housing Project	38,943	1,193
Capital commitment relating to Low Income Housing Project investments	28,004	51	0
Tax Credits and Benefits Related to Investments in Low Income Housing Projects	1,683	236
Amortization of the Investment in Low Income Housing Projects	1,089	187
Net Income Tax Benefit Related to Investments in Low Income Housing Projects	$594	$49

EMPLOYEE_BENEFIT_PLANS_Details

EMPLOYEE BENEFIT PLANS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Funded Status	At least 80 percent	At least 80 percent
FIP/RP Status Pending/Implemented	No
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	N/A
Minimum Contributions Required for Future Periods	$0
Pension Plan [Member] | Pentegra Defined Benefit Plan for Financial Institutions [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	135645888
Pension Plan Number	333
Minimum [Member]
Multiemployer Plans [Line Items]
Discount rate used for benefit obligation	2.24%
Maximum [Member]
Multiemployer Plans [Line Items]
Discount rate used for benefit obligation	3.84%

EMPLOYEE_BENEFIT_PLANS_Details1

EMPLOYEE BENEFIT PLANS (Details 1) (Pension Plan [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Plans [Line Items]
Cash payment	$1,320	$2,603	$234
2013-2014 [Member]
Multiemployer Plans [Line Items]
Cash payment	1,320
2012-2013 [Member]
Multiemployer Plans [Line Items]
Cash payment		1,762
2011-2012 [Member]
Multiemployer Plans [Line Items]
Cash payment		$841	$234

EMPLOYEE_BENEFIT_PLANS_Details2

EMPLOYEE BENEFIT PLANS (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	$1,500	$1,400	$1,600
Supplemental Executive Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	954	1,049	1,144
Contributions paid	$271	$253	$253

EMPLOYEE_BENEFIT_PLANS_Details3

EMPLOYEE BENEFIT PLANS (Details 3) (Supplemental Executive Retirement Plans [Member], USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	$315
2016	437
2017	431
2018	466
2019	515
2020-2024	$3,600

EMPLOYEE_BENEFIT_PLANS_Details4

EMPLOYEE BENEFIT PLANS (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets
Fair value of plan assets at end of year	$8,800,000	$8,500,000
Supplemental Executive Retirement Plans [Member]
Change in accumulated benefit obligation
Benefit obligation at beginning of year	8,243,000	8,714,000	7,550,000
Accumulated service cost	397,000	429,000	627,000
Interest cost	390,000	409,000	296,000
Plan amendment	1,357,000
Actuarial loss/(gain)	2,421,000	-1,056,000	494,000
Accumulated benefit obligation at end of year	12,537,000	8,243,000	8,714,000
Change in plan assets
Employer contribution	271,000	253,000	253,000
Benefits paid	-271,000	-253,000	-253,000
Funded status at end of year	-12,537,000	-8,243,000	-8,714,000
Assets	0	0	0
Liabilities	-12,537,000	-8,243,000	-8,714,000
Accrued benefit cost	-12,537,000	-8,243,000	-8,714,000
Amounts recognized in accumulated other comprehensive income (“AOCI”)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	-3,305,000	-938,000	-2,157,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	1,904,000	659,000	745,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	5,209,000	1,597,000	2,902,000
Information for plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	12,537,000	8,243,000	8,714,000
Accumulated benefit obligation	12,537,000	8,243,000	8,714,000
Net periodic benefit cost
Service cost	397,000	429,000	627,000
Interest cost	390,000	409,000	296,000
Amortization of prior service cost	113,000	113,000	113,000
Recognized net actuarial gain	54,000	155,000	108,000
Net periodic benefit cost	954,000	1,106,000	1,144,000
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Net actuarial loss	309,000	18,000	151,000
Net prior service cost	$947,000	$113,000	$99,000
Discount rate used for benefit obligation		4.95%	4.05%
Discount rate used for net periodic benefit cost		4.05%	4.40%
Minimum [Member]
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Discount rate used for benefit obligation	2.24%
Discount rate used for net periodic benefit cost	2.43%
Maximum [Member]
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year
Discount rate used for benefit obligation	3.84%
Discount rate used for net periodic benefit cost	4.76%

EMPLOYEE_BENEFIT_PLANS_Details5

EMPLOYEE BENEFIT PLANS (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	age
Defined Contribution Plan Disclosure [Line Items]
Nondiscretionary employer contribution, percent over social security limit	10.00%
Nondiscretionary employer contribution, percent up to social security limit	5.00%
Defined Contribution Plan, Nondiscretionary Requisite service hours	1000
Nondiscretionary requisite service period	1 year
Employee contribution percent	6.00%
Employer matching contribution percent	25.00%
Multiemployer Plans [Abstract]
Significance of contributions percentage	5.00%
Defined benefit plan expense	$1,500,000	$1,400,000	$1,600,000
Postretirement Benefits [Abstract]
Retirement age	65
Service period to be eligible for postretirement benefit	10 years
Death benefit	5,000
Supplemental Executive Retirement Plans [Abstract]
Plan assets	8,800,000	8,500,000
Incentive plans and discretionary bonus expense	8,500,000		7,800,000
Deferred Compensation Arrangements [Abstract]
Deferred compensation deferred	135,000	107,000	88,000
Deferred compensation, shares provided for the plan (in shares)	176,849	178,765
Deferred compensation, recorded liability	3,700,000	3,400,000
401(k) Restoration Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	56,000
Employee Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$4,242,000	$3,900,000	$3,600,000

FAIR_VALUE_MEASUREMENTS_Detail

FAIR VALUE MEASUREMENTS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Securities available for sale	$348,554	$356,862
Disposal Group, Including Discontinued Operation, Mortgage Loans	6,888	8,882
Total	22,390	16,697
Fair Value, Measurements, Recurring [Member]
Liabilities
Total recurring fair value measurements	350,180	356,314
Fair Value, Measurements, Recurring [Member] | U.S. Government agency securities
Assets
Securities available for sale	41,486	40,449
Fair Value, Measurements, Recurring [Member] | Agency mortgage-backed securities
Assets
Securities available for sale	217,678	234,591
Fair Value, Measurements, Recurring [Member] | Agency collateralized mortgage obligations
Assets
Securities available for sale	63,035	58,153
Fair Value, Measurements, Recurring [Member] | State, county, and municipal securities
Assets
Securities available for sale	5,223	5,412
Fair Value, Measurements, Recurring [Member] | Single issuer trust preferred securities issued by banks and insurers
Assets
Securities available for sale	2,909	2,952
Fair Value, Measurements, Recurring [Member] | Pooled trust preferred securities issued by banks and insurers
Assets
Securities available for sale	6,321	3,841
Fair Value, Measurements, Recurring [Member] | Equity securities
Assets
Securities available for sale	11,902	11,464
Fair Value, Measurements, Recurring [Member] | Loans held for sale
Assets
Disposal Group, Including Discontinued Operation, Mortgage Loans	6,888	8,882
Fair Value, Measurements, Recurring [Member] | Derivative instruments
Assets
Total	22,688	16,965
Fair Value, Measurements, Recurring [Member] | Derivative Instruments
Liabilities
Liabilities	27,950	26,395
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Liabilities
Total recurring fair value measurements	11,902	11,464
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State, county, and municipal securities
Assets
Securities available for sale		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities
Assets
Securities available for sale	11,902	11,464
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities
Total recurring fair value measurements	331,957	341,009
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government agency securities
Assets
Securities available for sale	41,486	40,449
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency mortgage-backed securities
Assets
Securities available for sale	217,678	234,591
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency collateralized mortgage obligations
Assets
Securities available for sale	63,035	58,153
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State, county, and municipal securities
Assets
Securities available for sale	5,223	5,412
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Single issuer trust preferred securities issued by banks and insurers
Assets
Securities available for sale	2,909	2,952
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Loans held for sale
Assets
Securities available for sale	6,888	8,882
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments
Assets
Total	22,688	16,965
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Instruments
Liabilities
Liabilities	27,950	26,395
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities
Total recurring fair value measurements	6,321	3,841
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government agency securities
Assets
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State, county, and municipal securities
Assets
Securities available for sale		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled trust preferred securities issued by banks and insurers
Assets
Securities available for sale	6,321	3,841
Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	15,939	17,961
Fair Value, Measurements, Nonrecurring [Member] | Collateral dependent impaired loans
Assets
Assets nonrecurring	8,196	10,328
Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned and other foreclosed assets
Assets
Assets nonrecurring	7,743	7,633
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	15,939	17,961
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateral dependent impaired loans
Assets
Assets nonrecurring	8,196	10,328
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned and other foreclosed assets
Assets
Assets nonrecurring	$7,743	$7,633

FAIR_VALUE_MEASUREMENTS_Detail1

FAIR VALUE MEASUREMENTS (Details 1) (Fair Value, Inputs, Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning Balance	$3,841	$6,513	$13,140
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	-76
Included in other comprehensive income	2,655	1,068	1,427
Sales	0	2,695	0
Settlements	-175	-1,045	-3,065
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0	-4,913
Ending Balance	6,321	3,841	6,513
Single issuer trust preferred securities issued by banks and insurers
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning Balance			4,210
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0
Included in other comprehensive income			703
Sales			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net			-4,913
Ending Balance			0
Pooled Trust Preferred Securities [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning Balance	3,841	2,981	2,820
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0
Included in other comprehensive income	2,655	1,132	313
Sales	0	0	0
Settlements	-175	-272	-152
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0	0
Ending Balance	6,321	3,841	2,981
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning Balance		3,532	6,110
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	-76
Included in other comprehensive income		-64	411
Sales		2,695	0
Settlements		-773	-2,913
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net		0	0
Ending Balance		$0	$3,532

FAIR_VALUE_MEASUREMENTS_Detail2

FAIR VALUE MEASUREMENTS (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	348,554	356,862
Weighted Average [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Prepayment	7.00%	7.20%
Cumulative Default	13.90%	18.10%
Loss Given Default	96.10%	95.70%
Cure Given Default	46.70%	39.90%
Pooled Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	6,321	3,841
Pooled Trust Preferred Securities [Member] | Minimum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Prepayment	0.00%	0.00%
Cumulative Default	3.00%	3.00%
Loss Given Default	85.00%	85.00%
Cure Given Default	0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Prepayment	75.00%	76.00%
Cumulative Default	100.00%	100.00%
Loss Given Default	100.00%	100.00%
Cure Given Default	75.00%	75.00%
Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Recurring	8,196	10,328
Other real estate owned and other foreclosed assets | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Recurring	7,743	7,633

FAIR_VALUE_MEASUREMENTS_Detail3

FAIR VALUE MEASUREMENTS (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	$375,453	$350,652
Loans and Leases Receivable, Net Amount	4,915,633	4,665,068
Securities held to maturity	379,699	346,455
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	70,080	140,294
Customer Repurchase Agreements and other short-term borrowings	147,890	154,288
Wholesale Repurchase Agreements	50,000	50,000
Junior subordinated debentures	73,685	73,906
Subordinated Debt	65,000	30,000
Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value	649,620	743,628
Accrued Liabilities, Fair Value Disclosure	651,180	746,908
Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	70,080	140,294
Accrued Liabilities, Fair Value Disclosure	70,208	140,321
Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Customer Repurchase Agreements and other short-term borrowings	147,890	154,288
Accrued Liabilities, Fair Value Disclosure	147,890	154,349
Wholesaled And Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Wholesale Repurchase Agreements	50,000	50,000
Accrued Liabilities, Fair Value Disclosure	50,510	51,298
Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Junior subordinated debentures	73,685	73,906
Accrued Liabilities, Fair Value Disclosure	70,045	67,481
Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Subordinated Debt	65,000	30,000
Accrued Liabilities, Fair Value Disclosure	64,198	28,396
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	651,180	746,908
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	70,208	140,321
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	70,045	67,481
Significant Unobservable Inputs (Level 3) [Member] | Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	147,890	154,349
Significant Unobservable Inputs (Level 3) [Member] | Wholesaled And Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	50,510	51,298
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	64,198	28,396
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	1,010	1,011
Securities held to maturity	1,073	1,042
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	1,073	1,042
Agency mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	159,522	155,067
Securities held to maturity	164,944	155,951
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	164,944	155,951
Agency collateralized mortgage obligations
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	207,995	187,388
Securities held to maturity	206,658	182,036
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	206,658	182,036
State, county, and municipal securities
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	424	678
Securities held to maturity	428	685
State, county, and municipal securities | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	428	685
Single issuer trust preferred securities issued by banks and insurers
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	1,500	1,503
Securities held to maturity	1,477	1,526
Single issuer trust preferred securities issued by banks and insurers | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	1,477	1,526
Corporate Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	5,002	5,005
Securities held to maturity	5,119	5,215
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	5,119	5,215
Loans Net Of Allowance For Loan Loses [Member]
Assets, Fair Value Disclosure [Abstract]
Loans and Leases Receivable, Net Amount	4,915,633	4,665,068
Loans, net of allowance for loan losses	4,883,479	4,655,920
Loans Net Of Allowance For Loan Loses [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses	$4,883,479	$4,655,920

OTHER_COMPREHENSIVE_LOSS_Detai

OTHER COMPREHENSIVE LOSS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in fair value of securities available for sale, pre tax amount	$9,095	($11,943)	($1,682)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, before Tax	191	230	-76
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	8,904	-12,173	-1,606
Change in fair value of cash flow hedges, pre tax amount	-969	592	-3,588
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax	-3,662	-5,723	-5,417
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	-1,122
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent	3,815	6,315	1,829
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	-2,699	1,302	-196
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	-1,357
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	44	-42	-5
Amortization of certain costs included in net periodic retirement costs, pre tax amount	-102	-102	-113
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	2	-4	-34
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	-4,000	1,450	-44
Total other comprehensive loss, pre tax amount	8,719	-4,408	179
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	-3,570	4,578	541
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Tax	-78	-94	31
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent	-3,492	4,672	510
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	396	-242	1,466
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Tax	1,496	2,338	2,213
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Tax	459
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent	-1,559	-2,580	-747
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	1,103	-532	80
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	554
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	-18	17	2
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax	42	42	46
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	-1	1	14
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	1,634	-592	18
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	-3,417	1,500	-219
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	5,525	-7,365	-1,141
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Net of Tax	113	136	-45
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	5,412	-7,501	-1,096
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-573	350	-2,122
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Net of Tax	-2,166	-3,385	-3,204
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Net of Tax	-663
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	2,256	3,735	1,082
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	-1,596	770	-116
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax	-803
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	26	-25	-3
Amortization of certain costs included in net periodic retirement costs, after tax amount	-60	-60	-67
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), Net of Tax	1	-3	-20
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	-2,366	858	-26
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$5,302	($2,908)	($40)

OTHER_COMPREHENSIVE_LOSS_Detai1

OTHER COMPREHENSIVE LOSS (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	($7,434)	($4,526)	($4,486)
Total other comprehensive income (loss)	5,302	-2,908	-40
Ending Balance	-2,132	-7,434	-4,526
Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	-2,023	5,478	6,574
Total other comprehensive income (loss)	5,412	-7,501	-1,096
Ending Balance	3,389	-2,023	5,478
Unrealized Loss on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	-5,698	-9,577	-10,804
Total other comprehensive income (loss)	2,400	3,879	1,227
Ending Balance	-3,298	-5,698	-9,577
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	715	859	1,004
Total other comprehensive income (loss)	-144	-144	-145
Ending Balance	571	715	859
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	-428	-1,286	-1,260
Total other comprehensive income (loss)	-2,366	858	-26
Ending Balance	($2,794)	($428)	($1,286)

OTHER_COMPREHENSIVE_LOSS_Detai2

OTHER COMPREHENSIVE LOSS (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Equity [Abstract]
Pre-tax OTTI credit related losses	$0	$0	$76,000
Gain on interest rate swaps	$571,000	$715,000	$859,000	$1,400,000

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$1,822,369	$1,621,873
Standby letters of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	18,516	18,923
Deferred standby letter of credit fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$105	$87

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details 1) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$7,945
2016	7,540
2017	7,040
2018	5,659
2019	4,932
Thereafter	9,743
Total future minimum rentals	$42,859

COMMITMENTS_AND_CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leases, Rent Expense, Net [Abstract]
Operating lease rent expense	$7,900,000	$7,600,000	$7,000,000
Reserve requirement	33,000,000	21,000,000
Minimum [Member]
Operating Leases, Rent Expense, Net [Abstract]
Operating lease renewal period option	1 year
Maximum [Member]
Operating Leases, Rent Expense, Net [Abstract]
Operating lease renewal period option	10 years
Affiliated Entity [Member]
Operating Leases, Rent Expense, Net [Abstract]
Operating lease rent expense	$1,000,000	$1,008,510	$991,000

REGULATORY_CAPITAL_REQUIREMENT2

REGULATORY CAPITAL REQUIREMENTS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$666,898	$589,811
Actual Ratio	13.15%	12.58%
Capital Required for Capital Adequacy	405,650	375,117
For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets):
Actual	551,836	505,646
Actual Ratio	10.88%	10.78%
For Capital Adequacy Purposes	202,825	187,558
For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital (to average assets):
Actual	551,836	505,646
Actual Ratio	8.84%	8.64%
For Capital Adequacy Purposes	249,825	234,153
For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank [Member]
Total capital (to risk weighted assets):
Actual	607,100	582,599
Actual Ratio	11.98%	12.42%
Capital Required for Capital Adequacy	405,465	375,205
For Capital Adequacy Purposes Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	506,831	469,006
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 capital (to risk weighted assets):
Actual	527,038	498,434
Actual Ratio	10.40%	10.63%
For Capital Adequacy Purposes	202,732	187,603
For Capital Adequacy Purposes Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	304,099	281,404
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%	6.00%
Tier 1 capital (to average assets):
Actual	527,038	498,434
Actual Ratio	8.44%	8.51%
For Capital Adequacy Purposes	249,788	234,154
For Capital Adequacy Purposes Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Correction Action Provisions	$312,235	$292,692
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	5.00%	5.00%

REGULATORY_CAPITAL_REQUIREMENT3

REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements (Details Textual) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$40.10	$30.60
Debt Instrument, Face Amount	$71	$71

PARENT_COMPANY_FINANCIALS_ONLY2

PARENT COMPANY FINANCIALS ONLY (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets:
Total assets	$6,364,912		$6,099,234
Liabilities and stockholders’ equity
Junior subordinated debentures	73,685		73,906
Subordinated Debt	65,000		30,000
Derivative instruments	225,824		225,648
Other liabilities	107,264		72,788
Total liabilities	5,724,385		5,507,694
Stockholders’ equity	640,527		591,540		529,320	469,057
Total liabilities and stockholders' equity	6,364,912		6,099,234
Parent Company [Member]
Assets:
Cash	64,791	[1]	16,855
Investments in subsidiaries	691,406	[2]	661,257	[2]
Prepaid income taxes	285
Deferred tax asset	2,620		3,777
Deferred stock issuance costs	467		201
Total assets	759,569		682,090
Liabilities and stockholders’ equity
Dividends payable	5,761		5,243
Short-term borrowings			5,000
Junior subordinated debentures	73,685		73,906
Subordinated Debt	35,000
Accrued Income Taxes			8
Derivative instruments	4,187	[1]	6,303	[1]
Other liabilities	409		90
Total liabilities	119,042		90,550
Stockholders’ equity	640,527		591,540
Total liabilities and stockholders' equity	759,569		682,090
Consolidation, Eliminations [Member]
Assets:
Investments in subsidiaries	$689,200		$659,100
[1]	Entire balance eliminates in consolidation.
[2]	689.2 million and $659.1 million eliminate in consolidation at December 31, 2014 and 2013, respectively.

PARENT_COMPANY_FINANCIALS_ONLY3

PARENT COMPANY FINANCIALS ONLY (Details 1) (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
Dividends received from subsidiaries(1)									($40,100)		($30,600)
Expenses
Interest expense	5,007	4,805	5,232	5,374	5,666	5,831	5,880	5,958	20,417		23,336		23,393
Income tax benefit	6,201	6,415	5,934	5,350	2,786	5,299	4,285	4,114	23,899		16,484		14,673
Net Income	15,978	15,738	14,746	13,383	10,588	14,655	12,758	12,252	59,845		50,254		42,627
Parent Company [Member]
Income
Dividends received from subsidiaries(1)									40,170	[1]	30,694	[1]	28,709	[1]
Interest income(2)									57	[2]	50	[2]	83	[2]
Total income									40,227		30,744		28,792
Expenses
Interest expense									4,225		4,122		3,795
Other expenses											15		6
Total expenses									4,225		4,137		3,801
Income before income taxes and equity in undistributed income of subsidiaries									36,002		26,607		24,991
Income tax benefit									-1,298		-1,342		-1,636
Income of parent company									37,300		27,949		26,627
Equity in undistributed income of subsidiaries									22,545		22,305		16,000
Net Income									59,845		50,254		42,627
Consolidation, Eliminations [Member]
Income
Dividends received from subsidiaries(1)									$53		$54		$45
[1]	Income of $53,000, $54,000 and $45,000 was not eliminated in consolidation for the years ended December 31, 2014, 2013, and 2012, respectively.
[2]	Entire balance eliminated in consolidation.

PARENT_COMPANY_FINANCIALS_ONLY4

PARENT COMPANY FINANCIALS ONLY (Details 2) (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 Financial Statements, Captions [Line Items]
Net income	$15,978		$15,738	$14,746	$13,383	$10,588	$14,655	$12,758	$12,252	$59,845		$50,254	$42,627
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income tax expense (benefit)										2,840		2,557	-1,919
Change in other assets										-6,617		48,903	-1,575
Change in other liabilities										7,258		-16,016	4,408
Net cash provided by operating activities										84,739		141,335	43,952
Cash flows used in investing activities
Net cash used in investing activities										-287,106		-208,596	-267,939
Cash flows provided by financing activities
Net repayments of short-term Federal Home Loan Bank borrowings										-65,000		-50,000
Proceeds from stock issued and stock options exercised										2,333		2,475	1,108
Issuance of shares under direct stock purchase plan										1,555		969	1,691
Common dividend paid										-22,443		-15,122	-22,494
Net cash provided by financing activities										164,296		68,112	201,957
Net increase (decrease) in cash and cash equivalents										-38,071		851	-22,030
Cash and cash equivalents at beginning of year					216,325				215,474	216,325		215,474	237,504
Cash and cash equivalents at end of period	178,254					216,325				178,254		216,325	215,474
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income										59,845		50,254	42,627
Adjustments to reconcile net income to net cash provided by operating activities
Accretion										-486		-155	-13
Deferred income tax expense (benefit)										293		203	-398
Change in other assets												-373	5,430
Change in other liabilities										25		206	-240
Equity in undistributed income of subsidiaries										-22,545		-22,305	-16,000
Net cash provided by operating activities										37,132		27,830	31,406
Cash flows used in investing activities
Cash paid for acquisitions, net of cash acquired												-10,832	-21,648
Net cash used in investing activities												-10,832	-21,648
Cash flows provided by financing activities
Proceeds from short-term borrowings												10,000	12,000
Repayment of short-term borrowings										-5,000		-17,000	-10,053
Net repayments of short-term Federal Home Loan Bank borrowings										35,000
Proceeds from stock issued and stock options exercised										1,692		2,475	1,242
Issuance of shares under direct stock purchase plan										1,555		969	1,691
Common dividend paid										-22,443		-15,122	-22,494
Net cash provided by financing activities										10,804		-18,678	-17,614
Net increase (decrease) in cash and cash equivalents										47,936		-1,680	-7,856
Cash and cash equivalents at beginning of year					16,855				18,535	16,855		18,535	26,391
Cash and cash equivalents at end of period	64,791					16,855				64,791		16,855	18,535
Cash	$64,791	[1]				$16,855				$64,791	[1]	$16,855
[1]	Entire balance eliminates in consolidation.

SELECTED_QUARTERLY_FINANCIAL_D2

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (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
Quarterly Financial Information Disclosure [Abstract]
Interest income	$54,827	$54,368	$54,285	$52,980	$52,571	$51,027	$51,495	$50,820	$216,459	$205,914	$196,192
Interest expense	5,007	4,805	5,232	5,374	5,666	5,831	5,880	5,958	20,417	23,336	23,393
Net interest income	49,820	49,563	49,053	47,606	46,905	45,196	45,615	44,862	196,042	182,578	172,799
Provision	1,750	1,901	2,250	4,502	3,150	2,650	3,100	1,300	10,403	10,200	18,056
Total noninterest income	18,473	17,098	16,857	17,516	17,464	18,130	16,692	15,724	69,943	68,009	62,016
Total noninterest expenses	44,364	42,607	42,980	41,887	47,845	40,722	42,164	42,920	171,838	173,649	159,459
Provision for income taxes	6,201	6,415	5,934	5,350	2,786	5,299	4,285	4,114	23,899	16,484	14,673
Net Income	15,978	15,738	14,746	13,383	10,588	14,655	12,758	12,252	59,845	50,254	42,627
Basic earnings per share (in dollars per share)	$0.67	$0.66	$0.62	$0.56	$0.45	$0.64	$0.56	$0.54	$2.50	$2.18	$1.96
Diluted earnings per share (in dollars per share)	$0.66	$0.66	$0.61	$0.56	$0.45	$0.64	$0.56	$0.54	$2.49	$2.18	$1.95
Weighted average common shares (basic) (in shares)	23,968,320	23,911,678	23,897,413	23,819,065	23,383,608	22,946,308	22,888,155	22,823,753	23,899,562	23,011,814	21,782,499
Common share equivalents (in shares)	86,812	90,685	94,560	100,173	97,445	100,806	52,144	46,040	93,815	76,764	29,817
Weighted average common shares (diluted) (in shares)	24,055,132	24,002,363	23,991,973	23,919,238	23,481,053	23,047,114	22,940,299	22,869,793	23,993,377	23,088,578	21,812,316
Gains (Losses) on Extinguishment of Debt	0	0	0	0	0	763	0	0	0	763	0
Gain on life insurance benefits	0	0	337	1,627	227	0	0	0	1,964	227	1,307
Available-for-sale Securities, Gross Realized Gains	121	0	0	0	258	0	0	0	121	258	5
Total Unusual or infrequent Income Items	121	0	337	1,627	485	763	0	0
Utilities Operating Expense, Impairments	0	21	0	503	0	0	0	0
Available-for-sale Securities, Gross Realized Losses	21	0	0	0	0	0	0	0	21	0	0
Loss on termination of derivatives	0	0	1,122	0	0	0	0	0	1,100
Acquisition Related Costs	586	677		77	6,219	366	754	1,345	1,339	8,685	6,741
Severance Costs	0	0	0	0	0	0	0	325
Total unusual or infrequent expense items	$607	$698	$1,122	$580	$6,219	$366	$754	$1,670

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended							12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 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	Feb. 20, 2015
Subsequent Event [Line Items]
Acquisition Related Costs	$586,000	$677,000	$77,000	$6,219,000	$366,000	$754,000	$1,345,000	$1,339,000	$8,685,000	$6,741,000
Subordinated Debt	65,000,000			30,000,000				65,000,000	30,000,000
Peoples Federal Bancshares, Inc [Member]
Subsequent Event [Line Items]
Acquisition Related Costs								1,300,000
Peoples Federal Bancshares, Inc [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share											$21
Number of shares of company stock issued for each share of Central common stock (in shares)											0.552
Fair Value of Shareholders Option To Receive (usd per share)											$23.26
Share Price (usd per share)											$42.11
Business transaction value											141,800,000
Cost of acquired entity, percentage cash											40.00%
Cost of Acquired Entity, Percentage Stock Consideration											60.00%
Cost of acquired entity, cash paid											55,400,000
Consideration Transferred, Equity Interests Issued and Issuable											86,400,000
Increase in acquirer outstanding shares											2,052,137
Subordinated Debt [Member]
Subsequent Event [Line Items]
Subordinated Debt	$30,000,000							$30,000,000
Debt Instrument term								5 years
Subordinated Debt [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Basis spread on variable rate								3.00%