Territorial Bancorp (TBNK) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 28, 2015	Jun. 30, 2014
Document and Entity Information
Entity Registrant Name	Territorial Bancorp Inc.
Entity Central Index Key	1447051
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$189.50
Entity Common Stock, Shares Outstanding		9,756,819
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS
Cash and cash equivalents	$75,060	$75,365
Investment securities held to maturity, at amortized cost (fair value of $586,710 and $598,007 at December 31, 2014 and 2013, respectively)	572,922	613,436
Federal Home Loan Bank stock, at cost	11,234	11,689
Federal Reserve Bank Stock, at cost	2,925
Loans held for sale	1,048	2,210
Loans receivable, net	968,212	856,542
Accrued interest receivable	4,436	4,310
Premises and equipment, net	5,629	6,056
Bank-owned life insurance	41,303	40,243
Deferred income taxes receivable	7,254	5,075
Prepaid expenses and other assets	1,874	1,978
Total assets	1,691,897	1,616,904
Liabilities:
Deposits	1,359,679	1,288,709
Advances from the Federal Home Loan Bank	15,000	15,000
Securities sold under agreements to repurchase	72,000	72,000
Accounts payable and accrued expenses	24,098	23,933
Current income taxes payable	826	1,414
Advance payments by borrowers for taxes and insurance	3,916	3,708
Total liabilities	1,475,519	1,404,764
Stockholders' Equity:
Preferred stock, $.01 par value; authorized 50,000,000 shares, no shares issued or outstanding
Common stock, $.01 par value; authorized 100,000,000 shares; issued and outstanding 9,919,064 and 10,051,377 shares at December 31, 2014 and 2013, respectively	99	101
Additional paid-in capital	75,229	77,340
Unearned ESOP shares	-6,851	-7,340
Retained earnings	153,289	145,826
Accumulated other comprehensive loss	-5,388	-3,787
Total stockholders' equity	216,378	212,140
Total liabilities and stockholders' equity	$1,691,897	$1,616,904

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Consolidated Balance Sheets
Investment securities held to maturity, fair value (in dollars)	$586,710	$598,007
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, authorized shares	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	100,000,000	100,000,000
Common stock, shares issued	9,919,064	10,051,377
Common stock, shares outstanding	9,919,064	10,051,377

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 and dividend income:
Investment securities	$19,752	$18,941	$23,224
Loans	39,620	36,982	36,566
Other investments	243	252	359
Total interest and dividend income	59,615	56,175	60,149
Interest expense:
Deposits	4,474	4,296	5,936
Advances from the Federal Home Loan Bank	266	302	418
Securities sold under agreements to repurchase	1,378	1,684	2,875
Total interest expense	6,118	6,282	9,229
Net interest income	53,497	49,893	50,920
Provision (reversal of allowance) for loan losses	360	39	415
Net interest income after provision for loan losses	53,137	49,854	50,505
Noninterest income:
Service fees on loan and deposit accounts	2,022	2,232	2,044
Income on bank-owned life insurance	1,060	1,066	942
Gain on sale of investment securities	1,263	3,450	1,234
Gain on sale of loans	396	1,541	2,411
Other	436	427	437
Total noninterest income	5,177	8,716	7,068
Noninterest expense:
Salaries and employee benefits	20,932	21,015	20,609
Occupancy	5,761	5,365	5,246
Equipment	3,701	3,524	3,269
Federal deposit insurance premiums	808	770	767
Loss on extinguishment of debt			321
Other general and administrative expenses	4,106	4,403	4,226
Total noninterest expense	35,308	35,077	34,438
Income before income taxes	23,006	23,493	23,135
Income taxes	8,909	8,846	8,297
Net income	$14,097	$14,647	$14,838
Basic earnings per share (in dollars per share)	$1.53	$1.51	$1.47
Diluted earnings per share (in dollars per share)	$1.51	$1.49	$1.45
Cash dividends declared per common share (in dollars per share)	$0.70	$0.62	$0.54
Basic weighted-average shares outstanding (in shares)	9,211,409	9,711,233	10,113,453
Diluted weighted-average shares outstanding (in shares)	9,317,323	9,844,942	10,213,190

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
Consolidated Statements of Comprehensive Income
Net income	$14,097	$14,647	$14,838
Change in unfunded pension liability	-1,694	454	-826
Change in unrealized loss on securities	1	23	29
Noncredit related gains on securities not expected to be sold	92	69	234
Other comprehensive income (loss)	-1,601	546	-563
Comprehensive income	$12,496	$15,193	$14,275

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Common Stock	Additional Paid-in Capital	Unearned ESOP Shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
In Thousands, unless otherwise specified
Balance at Dec. 31, 2011	$110	$97,640	($8,319)	$128,300	($3,770)	$213,961
Increase (Decrease) in Stockholders' Equity
Net income				14,838		14,838
Other comprehensive income (loss)					-563	-563
Cash dividends declared ($0.70 per share in 2014, $0.62 per share in 2013 and $0.54 per share in 2012)				-5,728		-5,728
Share-based compensation	1	2,690				2,691
Allocation of 48,932 ESOP shares in 2014, 48,932 ESOP shares in 2013 and 48,932 ESOP shares in 2012		592	490			1,082
Repurchase of 245,645 shares of company common stock in 2014, 868,203 shares of company common stock in 2013 and 370,643 shares of company common stock in 2012	-3	-8,022				-8,025
Exercise of 41,275 options on common stock in 2012		716				716
Balance at Dec. 31, 2012	108	93,616	-7,829	137,410	-4,333	218,972
Increase (Decrease) in Stockholders' Equity
Net income				14,647		14,647
Other comprehensive income (loss)					546	546
Cash dividends declared ($0.70 per share in 2014, $0.62 per share in 2013 and $0.54 per share in 2012)				-6,231		-6,231
Share-based compensation	1	2,675				2,676
Allocation of 48,932 ESOP shares in 2014, 48,932 ESOP shares in 2013 and 48,932 ESOP shares in 2012		636	489			1,125
Repurchase of 245,645 shares of company common stock in 2014, 868,203 shares of company common stock in 2013 and 370,643 shares of company common stock in 2012	-8	-19,587				-19,595
Balance at Dec. 31, 2013	101	77,340	-7,340	145,826	-3,787	212,140
Increase (Decrease) in Stockholders' Equity
Net income				14,097		14,097
Other comprehensive income (loss)					-1,601	-1,601
Cash dividends declared ($0.70 per share in 2014, $0.62 per share in 2013 and $0.54 per share in 2012)				-6,634		-6,634
Share-based compensation	1	2,816				2,817
Allocation of 48,932 ESOP shares in 2014, 48,932 ESOP shares in 2013 and 48,932 ESOP shares in 2012		547	489			1,036
Repurchase of 245,645 shares of company common stock in 2014, 868,203 shares of company common stock in 2013 and 370,643 shares of company common stock in 2012	-3	-5,474				-5,477
Balance at Dec. 31, 2014	$99	$75,229	($6,851)	$153,289	($5,388)	$216,378

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Stockholders' Equity, Share Data
Cash dividends declared (in dollars per share)	$0.70	$0.62	$0.54
Exercise of options on common stock, shares			41,275
Common Stock
Consolidated Statements of Stockholders' Equity, Share Data
Allocation of ESOP shares, shares	48,932	48,932	48,932
Repurchase of company common stock, shares	245,645	868,203	370,643

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 flows from operating activities:
Net income	$14,097	$14,647	$14,838
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	360	39	415
Depreciation and amortization	1,389	1,138	1,137
Deferred income tax benefit	-1,122	-1,856	-592
Amortization of fees, discounts, and premiums	-441	249	383
Origination of loans held for sale	-36,146	-81,654	-105,953
Proceeds from sales of loans held for sale	37,704	83,205	109,375
Gain on sale of loans, net	-396	-1,541	-2,411
Provision for real estate owned losses		14
Net gain on sale of real estate owned		-1	-6
Purchases of investment securities held for trading	-5,041
Proceeds from sale of investment securities held for trading	5,071
Gain on sale of investment securities held for trading	-30
Gain on sale of investment securities held to maturity	-1,233	-3,450	-1,234
Loss on extinguishment of debt			321
Net loss on sale of premises and equipment	4		9
ESOP expense	1,036	1,125	1,082
Share-based compensation expense	2,817	2,676	2,690
Excess tax benefits from share-based compensation			-54
(Increase) decrease in accrued interest receivable	-126	57	413
Net increase in bank-owned life insurance	-1,060	-1,066	-943
Net decrease in prepaid expenses and other assets	104	1,754	837
Net increase (decrease) in accounts payable and accrued expenses	-2,513	1,669	-1,140
Net increase in advance payments by borrowers for taxes and insurance	208	69	375
Net increase (decrease) in income taxes payable	-588	262	-1,962
Net cash provided by operating activities	14,094	17,336	17,580
Cash flows from investing activities:
Purchases of investment securities held to maturity	-38,826	-270,406	-148,043
Principal repayments on investment securities held to maturity	66,317	162,800	229,696
Proceeds from sale of investment securities held to maturity	14,248	51,102	17,206
Loan originations, net of principal repayments on loans receivable	-111,426	-80,752	-85,744
Proceeds from redemption of FHLB stock	455	439	220
Purchases of Federal Reserve Bank stock	-2,925
Purchases of bank-owned life insurance		-8,000
Proceeds from sale of real estate owned		130	590
Purchases of premises and equipment	-973	-2,138	-752
Proceeds from disposals of premises and equipment	7
Net cash provided by (used in) investing activities	-73,123	-146,825	13,173
Cash flows from financing activities:
Net increase in deposits	70,970	50,862	71,731
Proceeds from advances from the Federal Home Loan Bank		5,000	100
Repayments of advances from the Federal Home Loan Bank		-10,000	-100
Proceeds from securities sold under agreements to repurchase		25,000
Repayments of securities sold under agreements to repurchase		-23,000	-38,621
Purchases of Fed Funds	10		10
Sales of Fed Funds	-10		-10
Excess tax benefits from share-based compensation			54
Proceeds from issuance of common stock, net of costs			717
Repurchases of company stock	-5,612	-19,595	-8,025
Cash dividends paid	-6,634	-6,231	-5,728
Net cash provided by financing activities	58,724	22,036	20,128
Net increase (decrease) in cash and cash equivalents	-305	-107,453	50,881
Cash and cash equivalents at beginning of the year	75,365	182,818	131,937
Cash and cash equivalents at end of the year	75,060	75,365	182,818
Cash paid for:
Interest on deposits and borrowings	6,055	6,232	9,403
Income taxes	10,478	10,440	10,851
Supplemental disclosure of noncash investing activities:
Loans transferred to real estate owned		$143	$176

Organization

Organization	12 Months Ended
	Dec. 31, 2014
Organization
Organization
	(1)Organization
	On November 4, 2008, the Board of Directors of Territorial Mutual Holding Company (MHC) approved a plan of conversion and reorganization under which MHC would convert from a mutual holding company to a stock holding company.  The conversion to a stock holding company was approved by the depositors and borrowers of Territorial Savings Bank and the Office of Thrift Supervision (OTS) and included the filing of a registration statement with the U.S. Securities and Exchange Commission.  Upon the completion of the conversion and reorganization on July 10, 2009, Territorial Mutual Holding Company and Territorial Savings Group, Inc. ceased to exist as separate legal entities and Territorial Bancorp Inc. became the holding company for Territorial Savings Bank. A total of 12,233,125 shares were issued in the conversion at $10 per share, raising $122.3 million of gross proceeds.  Approximately $3.7 million of conversion expenses were offset against the gross proceeds.  Territorial Bancorp Inc.’s common stock began trading on the NASDAQ Global Select Market under the symbol “TBNK” on July 13, 2009.
	Upon completion of the conversion and reorganization, a special “liquidation account” was established in an amount equal to the total equity of Territorial Mutual Holding Company as of December 31, 2008.  The liquidation account is to provide eligible account holders and supplemental eligible account holders who maintain their deposit accounts with Territorial Savings Bank after the conversion with a liquidation interest in the unlikely event of the complete liquidation of Territorial Savings Bank after the conversion.  The liquidation account will be reduced annually to the extent that eligible account holders and supplemental eligible account holders have reduced their qualifying deposits.  Subsequent increases will not restore an eligible account holder’s or supplemental eligible account holder’s interest in the liquidation account.  In the event of a complete liquidation of Territorial Savings Bank, and only in such event, each account holder will be entitled to receive a distribution from the liquidation account in an amount proportionate to the adjusted qualifying account balances then held.  The balance of the liquidation account at December 31, 2014 was $15.2 million.
	On June 25, 2014, Territorial Savings Bank converted from a federal savings bank to a Hawaii state-chartered savings bank.  On July 10, 2014, Territorial Savings Bank became a member of the Federal Reserve System.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies
	(2)Summary of Significant Accounting Policies
	(a)Description of Business
	Territorial Bancorp Inc. (the “Company”), through its wholly-owned subsidiary, Territorial Savings Bank (the “Bank”), provides loan and deposit products and services primarily to individual customers through 28 branches located throughout Hawaii. We deal primarily in residential mortgage loans in the State of Hawaii.  The Company’s earnings depend primarily on its net interest income, which is the difference between the interest income earned on interest-earning assets (loans receivable and investments) and the interest expense incurred on interest-bearing liabilities (deposit liabilities and borrowings). Deposits traditionally have been the principal source of the Bank’s funds for use in lending, meeting liquidity requirements, and making investments. The Company also derives funds from receipt of interest and principal on outstanding loans receivable and investments, borrowings from the Federal Home Loan Bank (FHLB) of Seattle, securities sold under agreements to repurchase, and proceeds from issuance of common stock.
	(b)Principles of Consolidation
	The consolidated financial statements include the accounts and results of operations of Territorial Bancorp Inc. and Territorial Savings Bank and its wholly-owned subsidiaries, Territorial Real Estate Co., Inc. and Territorial Financial Services, Inc. Significant intercompany balances and transactions have been eliminated in consolidation.
	(c)Cash and Cash Equivalents
	Cash and cash equivalents includes cash and due from banks, interest-bearing deposits in other banks, federal funds sold, and short-term, highly liquid investments with original maturities of three months or less.
	(d)Investment Securities
	The Company classifies and accounts for its investment securities as follows: (1) held-to-maturity debt securities in which the Company has the positive intent and ability to hold to maturity are reported at amortized cost; (2) trading securities that are purchased for the purpose of selling in the near term are reported at fair value, with unrealized gains and losses included in current earnings; and (3) available-for-sale securities not classified as either held-to-maturity or trading securities are reported at fair value, with unrealized gains and losses excluded from current earnings and reported as a separate component of equity. At December 31, 2014 and 2013, the Company classified all of its investments as held-to-maturity.
	A decline in the market value of any available-for-sale or held-to-maturity security below cost, that is deemed to be other than temporary, results in an impairment to reduce the carrying amount to fair value. To determine whether impairment is other than temporary, the Company considers whether it has the intent and ability not to sell and would not be required to sell for a sufficient period of time to recover the remaining amortized cost basis.
	Gains or losses on the sale of investment securities are computed using the specific-identification method. The Company amortizes premiums and accretes discounts associated with investment securities using the interest method over the contractual life of the respective investment security. Such amortization and accretion is included in the interest and dividend income line item in the consolidated statements of income. Dividend and interest income are recognized when earned.
	(e)Loans Receivable
	This policy applies to all loan classes.  Loans receivable are stated at the principal amount outstanding, less the allowance for loan losses, loan origination fees and costs, and commitment fees. Interest on loans receivable is accrued as earned. The Company has a policy of placing loans on a nonaccrual basis when 90 days or more contractually delinquent or when, in the opinion of management, collection of all or part of the principal balance appears doubtful. For nonaccrual loans, the Company records payments received as a reduction in principal.  The Company, considering current information and events regarding the borrowers’ ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, if the loan is considered to be collateral dependent, based on the fair value of the collateral less estimated costs to sell.  Impairment losses are written off against the allowance for loan losses. For impaired loans, the Company records payments received as a reduction in principal. A nonaccrual loan may be restored to an accrual basis when principal and interest payments are current and full payment of principal and interest is expected.
	(f)Loans Held for Sale
	Loans held for sale are stated at the lower of aggregate cost or market value. Net fees and costs of originating loans held for sale are deferred and are included in the basis for determining the gain or loss on sales of loans held for sale.
	(g)Deferred Loan Origination Fees and Unearned Loan Discounts
	Loan origination and commitment fees and certain direct loan origination costs are being deferred, and the net amount is recognized over the life of the related loan as an adjustment to yield. Net deferred loan fees are amortized using the interest method over the contractual term of the loan, adjusted for actual prepayments. Net unamortized fees on loans paid in full are recognized as a component of interest income.
	(h)Real Estate Owned
	Real estate owned is valued at the time of foreclosure at fair value, less estimated cost to sell, thereby establishing a new cost basis. The Company obtains appraisals based on recent comparable sales to assist management in estimating the fair value of real estate owned. Subsequent to acquisition, real estate owned is valued at the lower of cost or fair value, less estimated cost to sell. Declines in value are charged to expense through a direct writedown of the asset. Costs related to holding real estate are charged to expense while costs related to development and improvements are capitalized.
	Gains from the sale of real estate owned, if any, are recognized when title has passed, minimum down payment requirements are met, the terms of any notes received are such as to satisfy continuing investment requirements, and the Company is relieved of any requirements for continued involvement with the properties. If the minimum down payment or the continuing investment is not adequate to meet the criteria specified in the Property, Plant and Equipment topic of the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC), the Company will defer income recognition and account for such sales using alternative methods, such as installment, deposit, or cost recovery.
	(i)Allowance for Loan Losses
	The Company maintains an allowance adequate to cover Management’s estimate of probable credit losses as of the balance sheet date.  The Company’s allowance for loan losses is maintained at a level considered adequate to provide for losses that can be estimated based upon specific and general conditions. All loan losses are charged, and all recoveries are credited, to the allowance for loan losses. Additions to the allowance for loan losses are provided by charges to income based on various factors, which, in the Company’s judgment, deserve current recognition in estimating probable losses. Charge-offs to the allowance are made when management determines that collectability of all or a portion of a loan is doubtful and available collateral is insufficient to repay the loan.
	General allowances are established for loan losses on a portfolio basis for loans that do not meet the definition of impaired, in accordance with the Receivables topic of the FASB ASC.  The portfolio is grouped into similar risk characteristics, primarily loan type and delinquency status. The Company applies an estimated loss rate to each loan group. The loss rates applied are based upon its loss experience adjusted, as appropriate, for environmental factors discussed below. This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions.  Actual loan losses may be significantly more than the allowance for loan losses the Company has established, which could have a material negative effect on its financial results.
	Residential mortgage loans represent the largest segment of the Company’s loan portfolio.  All of the residential mortgage loans are secured by a first mortgage on residential real estate in Hawaii and consist primarily of fixed-rate mortgage loans which have been underwritten to Freddie Mac and Fannie Mae guidelines and have similar risk characteristics.  The loan loss allowance is determined by first calculating the historical loss rate for this segment of the portfolio.  The loss rate may be adjusted for qualitative and environmental factors.  The allowance for loan loss is calculated by multiplying the adjusted loss rate by the total loans in this segment of the portfolio.
	The adjustments to historical loss experience are based on an evaluation of several qualitative and environmental factors, including:
	changes in lending policies and procedures, including changes in underwriting standards and collections, charge-off and recovery practices;
	changes in international, national, and local economic trends;
	changes in the types of loans in the loan portfolio;
	changes in the experience and ability of personnel in the mortgage loan origination and loan servicing departments;
	changes in the number and amount of delinquent loans and classified assets;
	changes in the type and volume of loans being originated;
	changes in the value of underlying collateral for collateral dependent loans;
	changes in any concentration of credit; and
	external factors such as competition, legal and regulatory requirements on the level of estimated credit losses in the existing loan portfolio.
	The Company also uses historical loss rates adjusted for qualitative and environmental factors to establish loan loss allowances for the following portfolio segments:
	home equity loans and lines of credit; and
	consumer and other loans.
	The Company has a limited loss experience for the construction, commercial and other mortgage segment of the loan portfolio.  The loan loss allowance on this portfolio segment is determined using the loan loss rate of other financial institutions in the State of Hawaii.  The allowance for loan loss is calculated by multiplying the loan loss rate of other financial institutions in the state by the total loans in this segment of the Company’s loan portfolio.
	In addition, the unallocated allowance is established to provide for probable losses that have been incurred as of the reporting date but are not reflected in the allocated allowance.
	While the Company uses the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations.  In addition, as an integral part of their examination process, the Federal Reserve Bank will periodically review the allowance for loan losses.  The Federal Reserve Bank may require the Company to increase the allowance based on their analysis of information available at the time of their examination.
	(j)Transfer of Financial Assets
	Transfers of financial assets are accounted for as sales when control is surrendered. Control is surrendered when the assets have been isolated from the Company, the transferee obtains the right to pledge or exchange the assets without constraint, and the Company does not maintain effective control over the transferred assets. Mortgage loans sold for cash are accounted for as sales as the above criteria have been met.
	Mortgage loans may also be packaged into securities that are issued and guaranteed by U.S. government-sponsored enterprises. The Company receives 100% of the mortgage-backed securities issued. Securitizations are not accounted for as sales and no gain or loss is recognized. The mortgage-backed securities received in securitizations are valued at amortized cost and classified as held-to-maturity.
	Mortgage loan transfers accounted for as sales and securitizations are without recourse, except for normal representations and warranties provided in sales transactions, and the Company may retain the related rights to service the loans.  The retained servicing rights create mortgage servicing assets that are accounted for in accordance with the Transfers and Servicing topic of the FASB ASC.  Mortgage servicing assets are initially valued at fair value and subsequently at the lower of cost or fair value and are amortized in proportion to and over the period of estimated net servicing income.   The Company uses a discounted cash flow model to determine the fair value of retained mortgage servicing rights. Prior to 2010, we retained the servicing rights on residential mortgage loans sold.  In 2010, we began selling loans primarily on a servicing-released basis.
	(k)Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is principally computed on the straight-line method over the estimated useful lives of the respective assets. The estimated useful life of buildings and improvements is 30 years, furniture, fixtures, and equipment is 3 to 10 years, and automobiles are 3 years. Leasehold improvements are amortized on a straight-line basis over the shorter of the lease term or estimated useful life of the asset.
	(l)Income Taxes
	The Company files consolidated federal income tax and consolidated state franchise tax returns.
	Deferred tax assets and liabilities are recognized using the asset and liability method of accounting for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and net operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the 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 tax rates is recognized in income in the period that includes the enactment date.
	We establish income tax contingency reserves for potential tax liabilities related to uncertain tax positions.  A liability for income tax uncertainties would be recorded for unrecognized tax benefits related to uncertain tax positions where it is more likely than not that the position will be sustained upon examination by a taxing authority.
	As of December 31, 2014 and 2013, the Company had not recognized a liability for income tax uncertainties in the accompanying consolidated balance sheets. Management concluded that a liability for income tax uncertainties is not expected to be recorded within the next 12 months.
	Tax years 2012 to 2013 currently remain subject to examination by the Internal Revenue Service. Tax years 2011 to 2013 currently remain subject to examination by the Department of Taxation of the State of Hawaii.
	(m)Impairment of Long-Lived Assets
	Long-lived assets, such as premises and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the consolidated balance sheets and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated.
	(n)Pension Plan
	Pension benefit costs (returns) are charged (credited) to salaries and employee benefits expense, and the corresponding prepaid (accrued) pension cost is recorded in prepaid expenses and other assets or accounts payable and accrued expenses in the consolidated balance sheets. The Company’s policy is to fund pension costs in amounts that will not be less than the minimum funding requirements of the Employee Retirement Income Security Act of 1974 and will not exceed the maximum tax-deductible amounts. The Company generally funds at least the net periodic pension cost, subject to limits and targeted funded status as determined with the consulting actuary.
	(o)Employee Stock Ownership Plan (ESOP)
	The cost of shares issued to the ESOP, but not yet allocated to participants, is shown as a reduction of stockholders’ equity.  Compensation expense is based on the market price of shares as they are committed to be released to participant accounts.  Dividends on allocated ESOP shares reduce retained earnings; dividends on unearned ESOP shares reduce debt and accrued interest.
	(p)Earnings Per Share
	Basic earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period.  Diluted earnings per share is computed by dividing net income by the sum of the weighted-average number of shares outstanding plus the dilutive effect of stock options and restricted stock.  ESOP shares not committed to be released are not considered outstanding.
	(q)Common Stock Repurchase Program
	In 2014, 2013, 2011 and 2010, the Company adopted common stock repurchase programs in which shares repurchased reduce the amount of shares issued and outstanding.  The repurchased shares may be reissued in connection with share-based compensation plans and for general corporate purposes.  As of December 31, 2014 and 2013, the Company had accumulated repurchases of 2,749,789 and 2,528,259 shares, respectively, of the total 3,099,253 and 2,699,253 shares authorized by the Board of Directors, respectively.  During 2014 and 2013, shares were repurchased at an average cost of $22.48 and $22.58, respectively.
	(r)Bank-Owned Life Insurance
The Company’s investment in bank-owned life insurance is based on cash surrender value.  The Company invests in bank-owned life insurance to provide a funding source for benefit plan obligations. Bank-owned life insurance also generally provides noninterest income that is nontaxable. Federal regulations generally limit the investment in bank-owned life insurance to 25% of the Company’s Tier 1 capital plus the allowance for loan losses.  At December 31, 2014, this limit was $51.4 million and the Company had invested $41.3 million in bank-owned life insurance at that date.
(s)Use of Estimates
The preparation of the consolidated financial statements requires management to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amount of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include the allowance for loan losses; valuation of certain investment securities and determination as to whether declines in fair value below amortized cost are other than temporary; valuation allowances for deferred income tax assets; mortgage servicing assets; and assets and obligations related to employee benefit plans.  Accordingly, actual results could differ from those estimates.
(t)Recently Issued Accounting Pronouncements
In January 2014, the Financial Accounting Standards Board (FASB) amended the Receivables topic of the FASB Accounting Standards Codification (ASC).  The amendment clarifies when an in substance repossession or foreclosure occurs and when a mortgage loan should be derecognized and the related real property recognized.  The amendment also requires disclosures about the amount of foreclosed residential real property held and the recorded investment in mortgage loans collateralized by residential real property in the process of foreclosure.  The amendment is effective for interim and annual periods beginning after December 15, 2014, with early adoption allowed.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
In May 2014, the FASB amended the Revenue Recognition topic of the FASB ASC.  The amendment seeks to clarify the principles for recognizing revenue as well as to develop common revenue standards for U.S. generally accepted accounting principles and International Financial Reporting Standards.  The amendment is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period.  Early application is not permitted.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
In June 2014, the FASB amended the Transfers and Servicing topic of the FASB ASC.  The amendment modifies the accounting for certain types of repurchase transactions as well as adds new disclosure requirements for repurchase transactions.  The amendment is effective for interim and annual periods beginning after December 15, 2014, with early adoption prohibited.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
In August 2014, the FASB amended the Receivables topic of the FASB ASC.  The amendment seeks to clarify the classification of foreclosed mortgage loans that are either fully or partially guaranteed under government programs, such as from the Federal Housing Administration (FHA) or the U.S. Department of Veterans Affairs (VA).  The amendment is effective for interim and annual periods beginning after December 15, 2014.  The Company does not expect the adoption of this amendment to have any effect on its consolidated financial statements.

Cash_and_Cash_Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2014
Cash and Cash Equivalents
Cash and Cash Equivalents
	(3)Cash and Cash Equivalents
	The table below presents the balances of cash and cash equivalents:
		December 31,
	(Dollars in thousands)	2014		2013
	Cash and due from banks	$	10,803	$	9,962
	Interest-earning deposits in other banks	64,257		65,403
	Cash and cash equivalents	$	75,060	$	75,365
	Interest-earning deposits in other banks consist primarily of deposits at the Federal Reserve Bank.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investment Securities
Investment Securities
	(4)Investment Securities
	The amortized cost and fair values of investment securities are as follows:
		Carrying		Gross Unrealized				Estimated
	(Dollars in thousands)	Value		Gains		Losses		Fair Value
	December 31, 2014:
	Held to maturity:
	U.S. government-sponsored mortgage-backed securities	$	572,232	18,078		(4,290	)	$	586,020
	Trust preferred securities	690		—		—		690
	Total	$	572,922	18,078		(4,290	)	$	586,710
	December 31, 2013:
	Held to maturity:
	U.S. government-sponsored mortgage-backed securities	$	612,899	7,979		(23,408	)	$	597,470
	Trust preferred securities	537		—		—		537
	Total	$	613,436	7,979		(23,408	)	$	598,007
	The carrying and estimated fair value of investment securities at December 31, 2014 are shown below. Incorporated in the maturity schedule are mortgage-backed and trust preferred securities, which are allocated using the contractual maturity as a basis. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
		Carrying		Estimated
	(Dollars in thousands)	Value		Fair Value
	Held to maturity:
	Due within 5 years	$	50	$	54
	Due after 5 years through 10 years	10		11
	Due after 10 years	572,862		586,645
	Total	$	572,922	$	586,710
	Realized gains and losses and the proceeds from sales of securities available for sale, held to maturity and trading are shown in the table below.  All sales of securities were U.S. government-sponsored mortgage-backed securities.
	(Dollars in thousands)	2014		2013			2012
	Proceeds from sales	$	19,319	$	51,102		$	17,206
	Gross gains	1,263		3,450			1,234
	Gross losses	—		—			—
	In 2014, the Company received proceeds of $14.2 million from the sale of $13.0 million of held-to-maturity debt securities, resulting in gross realized gains of $1.2 million.  In 2013, the Company received proceeds of $51.1 million from the sale of $47.7 million of held-to-maturity debt securities, resulting in gross realized gains of $3.5 million.  In 2012, the Company received proceeds of $17.2 million from the sale of $16.0 million of held-to-maturity debt securities, resulting in gross realized gains of $1.2 million.  The sale of these securities, for which the Company had already collected a substantial portion of the outstanding principal (at least 85%), is in accordance with the Investment topic of the FASB ASC and will not affect the historical cost basis used to account for the remaining securities in the held-to-maturity portfolio.
	Investment securities with carrying values of $270.2 million and $273.2 million at December 31, 2014 and 2013, respectively, were pledged to secure public deposits, securities sold under agreements to repurchase and transaction clearing accounts.
	Provided below is a summary of investment securities, which were in an unrealized loss position at December 31, 2014 and 2013. The Company does not intend to sell these securities until such time as the value recovers or the securities mature and it is not more likely than not that the Company will be required to sell the securities prior to recovery of value or the securities mature.
		Less Than 12 Months					12 Months or Longer					Total
				Unrealized						Unrealized		Number of			Unrealized
	Description of securities	Fair Value		Losses			Fair Value			Losses		Securities	Fair Value		Losses
	(Dollars in thousands)
	December 31, 2014:
	Mortgage-backed securities	$	12,717	$	65		$	183,349		$	4,225	37	$	196,066	$	4,290
	December 31, 2013:
	Mortgage-backed securities	$	361,445	$	21,678		$	22,010		$	1,730	69	$	383,455	$	23,408
	Mortgage-Backed Securities. The unrealized losses on the Company’s investment in mortgage-backed securities were caused by increases in market interest rates. All of the mortgage-backed securities are guaranteed by Freddie Mac or Fannie Mae, which are U.S. government-sponsored enterprises, or Ginnie Mae, which is a U.S. government agency. Since the decline in market value is attributable to changes in interest rates and not credit quality, and the Company does not intend to sell these investments until maturity and it is not more likely than not that the Company will be required to sell such investments prior to recovery of its amortized cost basis, the Company does not consider these investments to be other-than-temporarily impaired as of December 31, 2014 and 2013.
	Trust Preferred Securities. At December 31, 2014, the Company owns two trust preferred securities, PreTSL XXIII and XXIV. The trust preferred securities represent investments in a pool of debt obligations issued primarily by holding companies for Federal Deposit Insurance Corporation-insured financial institutions.  Both of these securities are classified in the Company’s held-to-maturity investment portfolio.
	The trust preferred securities market is considered to be inactive as only five transactions have occurred over the past 36 months in the same tranche of securities owned by the Company.  The Company used a discounted cash flow model to determine whether these securities are other-than-temporarily impaired.  The assumptions used in preparing the discounted cash flow model include the following: estimated discount rates, estimated deferral and default rates on collateral, and estimated cash flows.
	Based on the Company’s review, the Company’s investment in trust preferred securities did not incur additional impairment during the years ended December 31, 2014, 2013 and 2012.
	PreTSL XXIV had a book value of $0 at December 31, 2014.  PreTSL XXIII had a book value of $690,000 at December 31, 2014.  The difference between the book value of $690,000 and the remaining amortized cost basis of $1.1 million is reported as other comprehensive loss and is related to noncredit factors such as the trust preferred securities market being inactive.
	It is reasonably possible that the fair values of the trust preferred securities could decline in the near term if the overall economy and the financial condition of some of the issuers continue to deteriorate and the liquidity of these securities remains low.  As a result, there is a risk that the Company’s remaining amortized cost basis of $1.1 million on its trust preferred securities could be credit-related other-than-temporarily impaired in the near term.  The impairment could be material to the Company’s consolidated statements of income.
	The table below provides a cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold:
	(Dollars in thousands)	2014		2013
	Balance at January 1,	$	5,885	$	5,885
	Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	—		—
	Balance at December 31,	$	5,885	$	5,885
	The table below shows the components of comprehensive loss, net of taxes, resulting from other-than-temporarily impaired securities:
		December 31,
	(Dollars in thousands)	2014		2013
	Noncredit losses on other-than-temporarily impaired securities, net of taxes	$	283	$	376

Federal_Home_Loan_Bank_Stock

Federal Home Loan Bank Stock (FHLB stock)	12 Months Ended
	Dec. 31, 2014
FHLB stock
Federal Home Loan Bank Stock
Federal Home Loan Bank Stock
	(5)Federal Home Loan Bank Stock
	The Company, as a member of the FHLB system, is required to obtain and hold shares of capital stock of the FHLB in an amount equal to the greater of 0.50% of mortgage loans and mortgage-backed securities or $500. At December 31, 2014 and 2013, the Company met such requirement.  At December 31, 2014 and 2013, the Company owned $11.2 million and $11.7 million, respectively, of capital stock of the FHLB.
	The Company evaluated its investment in FHLB stock for other-than-temporary impairment as of December 31, 2014, consistent with its accounting policies.  Based on the Company’s evaluation of the underlying investment, including the long-term nature of the investment, the liquidity position of the FHLB of Seattle, the actions being taken by the FHLB of Seattle to address its regulatory capital situation and the Company’s intent not to sell the investment for a sufficient period of time to recover the par value, the Company did not consider its FHLB stock other-than-temporarily impaired.  As of December 31, 2014, the FHLB of Seattle had met all of its regulatory capital requirements.  Moody’s Investor Service and Standard and Poor’s Rating Services have given the FHLB of Seattle credit ratings of Aaa and AA, respectively.  Even though the Company did not recognize an other-than-temporary impairment loss on its investment in FHLB stock in 2014, continued deterioration in the FHLB of Seattle’s financial position may result in future impairment losses.
	On July 31, 2014, the FHLB of Seattle and Des Moines announced a proposed merger.  On December 22, 2014, the Federal Housing Finance Agency approved the merger application of the Seattle and Des Moines banks.  If approved by a vote of the members of the Seattle and Des Moines banks, the merger is expected to be completed by the end of the second quarter of 2015.  When the merger is completed, the Company’s stock in the Seattle Bank will be exchanged for stock in the FHLB of Des Moines.  The merger will not impair the Company’s investment in FHLB stock.

Federal_Reserve_Bank_Stock

Federal Reserve Bank Stock (FRB stock)	12 Months Ended
	Dec. 31, 2014
FRB stock
Federal Home Loan Bank Stock
Federal Reserve Bank Stock
	(6)Federal Reserve Bank Stock
	The Company, as a member of the Federal Reserve System, is required to hold shares of capital stock of the Federal Reserve Bank of San Francisco equal to six percent of capital and surplus of the Bank.  At December 31, 2014, the Company met such requirement.  At December 31, 2014, the Company owned $2.9 million of capital stock of the Federal Reserve Bank of San Francisco.
	The Company evaluated its investment in the stock of the Federal Reserve Bank of San Francisco for impairment.  Based on the Company’s evaluation of the underlying investment, including the long-term nature of the investment and the liquidity position of the FRB of San Francisco, the Company did not consider its FRB stock other-than-temporarily impaired.

Loans_Receivable_and_Allowance

Loans Receivable and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2014
Loans Receivable and Allowance for Loan Losses
Loans Receivable and Allowance for Loan Losses
	(7)Loans Receivable and Allowance for Loan Losses
	The components of loans receivable are as follows:
			December 31,
	(Dollars in thousands)		2014			2013
	Real estate loans:
	First mortgages:
	One- to four-family residential		$	926,074		$	823,273
	Multi-family residential		8,920			4,877
	Construction, commercial, and other		18,415			13,554
	Home equity loans and lines of credit		15,992			16,524
	Total real estate loans		969,401			858,228
	Other loans:
	Loans on deposit accounts		441			342
	Consumer and other loans		4,173			4,307
	Total other loans		4,614			4,649
	Less:
	Net unearned fees and discounts		(4,112		)	(4,849		)
	Allowance for loan losses		(1,691		)	(1,486		)
	Total unearned fees, discounts and allowance for loan losses		(5,803		)	(6,335		)
	Loans receivable, net		$	968,212		$	856,542
	The activity in the allowance for loan losses on loans receivable is as follows:
			For the year ended December 31,
	(Dollars in thousands)		2014			2013			2012
	Balance, beginning of year		$	1,486		$	1,672		$	1,541
	Provision for loan losses		360			39			415
			1,846			1,711			1,956
	Charge-offs		(185		)	(495		)	(392		)
	Recoveries		30			270			108
	Net charge-offs		(155		)	(225		)	(284		)
	Balance, end of year		$	1,691		$	1,486		$	1,672
	The table below presents the activity in the allowance for loan losses by portfolio segment:
	(Dollars in thousands)		Residential			Construction,			Home			Consumer			Unallocated			Totals
			Mortgage			Commercial			Equity			and Other
						and Other			Loans and
						Mortgage			Lines of
						Loans			Credit
	2014:00:00
	Balance, beginning of year		$	376		$	799		$	10		$	229		$	72		$	1,486
	Provision (reversal of allowance) for loan losses		146			176			1			76			(39		)	360
			522			975			11			305			33			1,846
	Charge-offs		(118		)	—			(10		)	(57		)	—			(185		)
	Recoveries		9			2			4			15			—			30
	Net charge-offs		(109		)	2			(6		)	(42		)	—			(155		)
	Balance, end of year		$	413		$	977		$	5		$	263		$	33		$	1,691
	2013:00:00
	Balance, beginning of year		$	590		$	818		$	35		$	107		$	122		$	1,672
	Provision (reversal of allowance) for loan losses		(150		)	(31		)	18			252			(50		)	39
			440			787			53			359			72			1,711
	Charge-offs		(299		)	—			(50		)	(146		)	—			(495		)
	Recoveries		235			12			7			16			—			270
	Net charge-offs		(64		)	12			(43		)	(130		)	—			(225		)
	Balance, end of year		$	376		$	799		$	10		$	229		$	72		$	1,486
	The allowance for loan loss for each segment of the loan portfolio is generally determined by calculating the historical loss of each segment for a three- to five-year look-back period and adding a qualitative adjustment for the following factors:
		·		Changes in lending policies and procedures;
		·		Changes in economic trends;
		·		Changes in types of loans in the loan portfolio;
		·		Changes in experience and ability of personnel in the loan origination and loan servicing departments;
		·		Changes in the number and amount of delinquent loans and classified assets;
		·		Changes in our internal loan review system;
		·		Changes in the value of underlying collateral for collateral dependent loans;
		·		Changes in any concentrations of credit; and
		·		External factors such as competition, legal and regulatory requirements on the level of estimated credit losses in the existing loan portfolio.
	In 2014, the Company extended the look-back period that is used to calculate the historical loss rates from three to five years.  The look-back period was extended to five years because the longer look-back is considered to be more representative of an entire economic cycle.
The allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.  The unallocated allowance is established for probable losses that have been incurred as of the reporting date but are not reflected in the allocated allowance.
Management considers the allowance for loan losses at December 31, 2014 to be at an appropriate level to provide for probable losses that can be reasonably estimated based on general and specific conditions at that date.  While the Company uses the best information it has available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations.  To the extent actual outcomes differ from the estimates, additional provisions for credit losses may be required that would reduce future earnings.  In addition, as an integral part of their examination process, the Federal Reserve Bank periodically reviews the allowance for loan losses and may require the Company to increase the allowance based on their analysis of information available at the time of their examination.
The table below presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method:
(Dollars in thousands)		Residential			Construction			Home			Consumer			Unallocated			Totals
		Mortgage			Commercial			Equity			and Other
					and Other			Loans and
					Mortgage			Lines of
					Loans			Credit
December 31, 2014:
Allowance for loan losses:
Ending allowance balance:
Individually evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		413			977			5			263			33			1,691
Total ending allowance balance		$	413		$	977		$	5		$	263		$	33		$	1,691
Loans:
Ending loan balance:
Individually evaluated for impairment		$	6,158		$	—		$	296		$	4		$	—		$	6,458
Collectively evaluated for impairment		924,732			18,399			15,702			4,612			—			963,445
Total ending loan balance		$	930,890		$	18,399		$	15,998		$	4,616		$	—		$	969,903
December 31, 2013:
Allowance for loan losses:
Ending allowance balance:
Individually evaluated for impairment		$	—		$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment		376			799			10			229			72			1,486
Total ending allowance balance		$	376		$	799		$	10		$	229		$	72		$	1,486
Loans:
Ending loan balance:
Individually evaluated for impairment		$	8,373		$	—		$	160		$	—		$	—		$	8,533
Collectively evaluated for impairment		814,960			13,514			16,372			4,649			—			849,495
Total ending loan balance		$	823,333		$	13,514		$	16,532		$	4,649		$	—		$	858,028
The table below presents the balance of impaired loans and the related amount of allocated loan loss allowances:
(Dollars in thousands)		2014			2013
Loans with no allocated allowance for loan losses		$	6,458		$	8,533
Loans with allocated allowance for loan losses		—			—
Total impaired loans		$	6,458		$	8,533
Amount of allocated loan loss allowance		$	—		$	—
The table below presents the balance of impaired loans individually evaluated for impairment by class of loans:
(Dollars in thousands)		Recorded			Unpaid
		Investment			Principal
					Balance
December 31, 2014:
With no related allowance recorded:
One- to four-family residential mortgages		$	6,158		$	6,775
Home equity loans and lines of credit		296			324
Consumer and other		4			4
Total		$	6,458		$	7,103
December 31, 2013:
With no related allowance recorded:
One- to four-family residential mortgages		$	8,373		$	8,716
Home equity loans and lines of credit		160			165
Total		$	8,533		$	8,881
December 31, 2012:
With no related allowance recorded:
One- to four-family residential mortgages		$	6,775		$	7,175
Home equity loans and lines of credit		160			165
Total		$	6,935		$	7,340
The table below presents the average recorded investment and interest income recognized on impaired loans by class of loans:
(Dollars in thousands)		Average			Interest Income
		Recorded			Recognized
		Investment
2014:00:00
With no related allowance recorded:
One- to four-family residential mortgages		$	6,383		$	118
Home equity loans and lines of credit		309			—
Consumer and other		4			—
Total		$	6,696		$	118
2013:00:00
With no related allowance recorded:
One- to four-family residential mortgages		$	8,451		$	130
Home equity loans and lines of credit		160			—
Total		$	8,611		$	130
2012:00:00
With no related allowance recorded:
One- to four-family residential mortgages		$	6,924		$	210
Home equity loans and lines of credit		159			6
Total		$	7,083		$	216
There were no loans individually evaluated for impairment with a related allowance for loan loss as of December 31, 2014, 2013 or 2012. Loans individually evaluated for impairment do not have an allocated allowance for loan loss because they are written down to fair value.
The table below presents the aging of loans and accrual status by class of loans:
(Dollars in thousands)		30 — 59			60 — 89			90 Days or			Total Past			Loans Not			Total			Nonaccrual		Loans
		Days Past			Days Past			Greater			Due			Past Due			Loans			Loans		More Than
		Due			Due			Past Due														90 Days
																						Past Due
																						and Still
																						Accruing
December 31, 2014:
One- to four-family residential mortgages		$	1,040		$	736		$	593		$	2,369		$	919,624		$	921,993		$	4,153	$	—
Multi-family residential mortgages		—			—			—			—			8,897			8,897			—		—
Construction, commercial and other mortgages		—			—			—			—			18,399			18,399			—		—
Home equity loans and lines of credit		—			—			161			161			15,837			15,998			296		—
Loans on deposit accounts		—			—			—			—			440			440			—		—
Consumer and other		7			1			4			12			4,164			4,176			4		—
Total		$	1,047		$	737		$	758		$	2,542		$	967,361		$	969,903		$	4,453	$	—
December 31, 2013:
One- to four-family residential mortgages		$	376		$	612		$	1,577		$	2,565		$	815,917		$	818,482		$	5,840	$	—
Multi-family residential mortgages		—			—			—			—			4,851			4,851			—		—
Construction, commercial and other mortgages		—			—			—			—			13,514			13,514			—		—
Home equity loans and lines of credit		—			—			—			—			16,532			16,532			160		—
Loans on deposit accounts		—			—			—			—			342			342			—		—
Consumer and other		11			4			—			15			4,292			4,307			—		—
Total		$	387		$	616		$	1,577		$	2,580		$	855,448		$	858,028		$	6,000	$	—
The Company primarily uses the aging of loans and accrual status to monitor the credit quality of its loan portfolio.  When a mortgage loan becomes seriously delinquent (90 days or more contractually past due), it displays weaknesses that may result in a loss. As a loan becomes more delinquent, the likelihood of the borrower repaying the loan decreases and the loan becomes more collateral-dependent.  A mortgage loan becomes collateral-dependent when the proceeds for repayment can be expected to come only from the sale or operation of the collateral and not from borrower repayments.  Generally, appraisals are obtained after a loan becomes collateral-dependent or is five months delinquent.  The carrying value of collateral-dependent loans is adjusted to the fair value of the collateral less selling costs.  Any commercial real estate, commercial, construction or equity loan that has a loan balance in excess of a specified amount is also periodically reviewed to determine whether the loan exhibits any weaknesses and is performing in accordance with its contractual terms.
The Company had 18 nonaccrual loans with a book value of $4.5 million at December 31, 2014 and 19 nonaccrual loans with a book value of $6.0 million as of December 31, 2013.  The Company collected interest on nonaccrual loans of $244,000 and $164,000 during 2014 and 2013, respectively, but due to regulatory requirements, the Company recorded it as a reduction of principal.  The Company collected or recognized interest income on nonaccrual loans of $105,000 during 2012.  The Company would have recognized additional interest income of $204,000, $222,000 and $115,000 during 2014, 2013, and 2012, respectively, had the loans been accruing interest.  The Company did not have any loans more than 90 days past due and still accruing interest as of December 31, 2014 or 2013.
The table below presents information about the Company’s new troubled debt restructurings by class of loans:
		2014								2013
(Dollars in thousands)		Number of		Pre-			Post-			Number of		Pre-			Post-
		Loans		Modification			Modification			Loans		Modification			Modification
				Recorded			Recorded					Recorded			Recorded
				Investment			Investment					Investment			Investment
December 31:
One- to four-family residential		—		$	—		$	—		2		$	1,043		$	1,043
There were no new troubled debt restructurings within the past 12 months that subsequently defaulted.
The Company had 17 troubled debt restructurings totaling $4.6 million as of December 31, 2014 that were considered to be impaired. This total included 16 one- to four-family residential mortgage loans totaling $4.4 million and one home equity loan for $135,000.  Six of the loans, totaling $2.0 million, were performing in accordance with their restructured terms and accruing interest at December 31, 2014.   Nine of the loans, totaling $2.2 million, were performing in accordance with their restructured terms but not accruing interest at December 31, 2014.  Two of the loans, totaling $343,000, are delinquent and not accruing interest as of December 31, 2014.  The Company had 20 troubled debt restructurings totaling $5.8 million as of December 31, 2013 that were considered to be impaired. This total included 19 one- to four-family residential mortgage loans totaling $5.6 million and one home equity loan for $160,000.  Eight of the loans, totaling $2.5 million, were performing in accordance with their restructured terms and accruing interest at December 31, 2013.   Twelve of the loans, totaling $3.3 million, were performing in accordance with their restructured terms but not accruing interest at December 31, 2013.  Restructurings include deferrals of interest and/or principal payments and temporary or permanent reductions in interest rates due to the financial difficulties of the borrowers.  We have no commitments to lend any additional funds to these borrowers.
Nearly all of our real estate loans are collateralized by real estate located in the State of Hawaii. Loan-to-value ratios on these real estate loans generally do not exceed 80% at the time of origination.
During the years ended December 31, 2014, 2013 and 2012, the Company sold $37.5 million, $82.2 million and $107.9 million, respectively, of mortgage loans held for sale and recognized gains of $396,000, $1.5 million and $2.4 million, respectively.  The Company had six loans held for sale totaling $1.0 million and $2.2 million at December 31, 2014 and 2013, respectively.
The Company serviced loans for others of $60.5 million, $68.4 million, and $84.8 million at December 31, 2014, 2013, and 2012, respectively.  Of these amounts, $2.5 million, $3.1 million, and $5.1 million relate to securitizations for which the Company continues to hold the related mortgage-backed securities at December 31, 2014, 2013, and 2012, respectively.  The amount of contractually specified servicing fees earned was $179,000, $213,000, and $275,000 for 2014, 2013, and 2012, respectively.  The fees are reported in service fees on loan and deposit accounts in the consolidated statements of income.
In the normal course of business, the Company has made loans to certain directors and executive officers under terms which management believes are consistent with the Company’s general lending policies.  Loans to directors and executive officers amounted to $1.5 million at December 31, 2014 and $1.6 million at December 31, 2013.

Accrued_Interest_Receivable

Accrued Interest Receivable	12 Months Ended
	Dec. 31, 2014
Accrued Interest Receivable
Accrued Interest Receivable
	(8)Accrued Interest Receivable
	The components of accrued interest receivable are as follows:
		December 31,
	(Dollars in thousands)	2014		2013
	Investment securities	$	1,562	$	1,707
	Loans receivable	2,872		2,601
	Interest-bearing deposits	2		2
	Total	$	4,436	$	4,310

Mortgage_Servicing_Assets

Mortgage Servicing Assets	12 Months Ended
	Dec. 31, 2014
Mortgage Servicing Assets
Mortgage Servicing Assets
	(9)Mortgage Servicing Assets
	Mortgage servicing assets are created when the Company sells mortgage loans and retains the rights to service the loans.  Mortgage servicing assets are accounted for in accordance with the Transfers and Servicing topic of the FASB ASC and are initially valued at fair value and subsequently at the lower of cost or fair value.  We amortize mortgage servicing assets in proportion to and over the period of estimated net servicing income.  All servicing assets are grouped into categories based on the interest rate and original term of the loan sold.  Mortgage servicing assets related to loan sales are recorded as a gain on sale of loans and totaled $20,000 and $36,000 for the years ended December 31, 2014 and 2013, respectively.
	The table below presents the changes in our mortgage servicing assets:
	(Dollars in thousands)	2014			2013
	Balance at beginning of year	$	580		$	646
	Additions	20			36
	Impairments	(15		)	—
	Amortization	(80		)	(102		)
	Balance at end of year	$	505		$	580
	The table below presents the gross carrying values, accumulated amortization, and net carrying values of our mortgage servicing assets:
		December 31,
	(Dollars in thousands)	2014			2013
	Gross carrying value	$	1,358		$	1,353
	Accumulated amortization	(853		)	(773		)
	Net carrying value	$	505		$	580
	The estimated amortization expense for our mortgage servicing assets for the next five years and all years thereafter are as follows:
	(Dollars in thousands)
	2015	$	85
	2016	65
	2017	54
	2018	45
	2019	36
	Thereafter	220
	Total	$	505
	The Company uses a discounted cash flow model to determine the fair value of retained mortgage servicing assets.  The discounted cash flow model is also used to assess impairment of servicing assets.  Impairments are recorded as adjustments to amortization expense and included in service fees on loan and deposit accounts in the statements of income.  Critical assumptions used in the discounted cash flow model include mortgage prepayment speeds, discount rates, cost of servicing and ancillary income.
	Prepayment speed may be affected by economic factors such as home price appreciation, market interest rates, the availability of other loan products to our borrowers and customer payment patterns.  Prepayment speeds include the impact of all borrower prepayments, including full payoffs, additional principal payments and the impact of loans paid off due to foreclosure liquidations.  As market interest rates decline, prepayment speeds will generally increase as customers refinance existing mortgage loans under more favorable interest rate terms and anticipated cash flows will generally decline resulting in a potential reduction, or impairment, to the fair value of the mortgage servicing assets.  Alternatively, an increase in market interest rates may cause a decrease in prepayment speeds and therefore an increase in the fair value of mortgage servicing assets.
	The table below presents the fair values and key assumptions used in determining the fair values of our mortgage servicing assets as of December 31, 2014 and 2013:
		2014			2013
	Fair value, beginning of year (in thousands)	$	617		$	651
	Fair value, end of year (in thousands)	505			617
	Weighted average discount rate	10.50		%	10.50		%
	Weighted average prepayment speed assumption (PSA prepayment speed)	178.9			146.0
	Annual cost to service (per loan)	$	55		$	55
	The PSA prepayment model assumes increasing prepayment rates for the first 30 months of a loan’s term and constant prepayment rates thereafter.

Interest_Rate_Lock_and_Forward

Interest Rate Lock and Forward Loan Sale Commitments	12 Months Ended
	Dec. 31, 2014
Interest Rate Lock and Forward Loan Sale Commitments
Interest Rate Lock and Forward Loan Sale Commitments
	(10)Interest Rate Lock and Forward Loan Sale Commitments
	The Company may enter into interest rate lock commitments with borrowers on loans intended to be sold. To manage interest rate risk on the lock commitments, the Company may also enter into forward loan sale commitments.  The interest rate lock commitments and forward loan sale commitments are treated as derivatives and are recorded at their fair values in prepaid expenses and other assets or in accounts payable and accrued expenses.  Changes in fair value are recorded in current earnings.  At December 31, 2014, interest rate locks and forward loan sale commitments on loans held for sale amounted to $6.4 million and $7.4 million, respectively.
	The table below presents the location of assets and liabilities related to derivatives:
			Asset Derivatives					Liability Derivatives
		Location on	Fair Value at December 31,					Fair Value at December 31,
	(Dollars in thousands)	Balance Sheet	2014		2013			2014		2013
	Interest rate contracts	Prepaid expenses and other assets	$	62	$	25		$	—	$	—
	Interest rate contracts	Accounts payable and accrued expenses	—		—			54		28
	Total derivatives		$	62	$	25		$	54	$	28
	The table below presents the location of gains and losses related to derivatives:
		Location of
		Loss on
	(Dollars in thousands)	Statement of Income	2014		2013
	Interest rate contracts	Gain on sale of loans	$	11	$	(16	)

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Premises and Equipment
Premises and Equipment
	(11)Premises and Equipment
	Premises and equipment are as follows:
		December 31,
	(Dollars in thousands)	2014			2013
	Land	$	585		$	585
	Buildings and improvements	1,008			597
	Leasehold improvements	12,765			11,596
	Furniture, fixtures and equipment	5,612			5,323
	Automobiles	115			113
		20,085			18,214
	Less accumulated depreciation and amortization	(14,474		)	(13,218		)
		5,611			4,996
	Construction in progress	18			1,060
	Total	$	5,629		$	6,056
	Depreciation expense was $1.4 million for the year ended December 31, 2014 and $1.1 million for each of the years ended December 31, 2013 and 2012.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits
Deposits
	(12)Deposits
	Deposit accounts by type are summarized with their respective weighted-average interest rates as follows:
		December 31,
		2014				2013
	(Dollars in thousands)	Amount		Rate		Amount			Rate
	Non-interest bearing	$	40,040	—	%	$	33,032		—	%
	Savings accounts	946,060		0.36		905,469			0.35
	Certificates of deposit	221,737		0.48		209,998			0.55
	Money market	749		0.20		807			0.20
	Checking and Super NOW	151,093		0.02		139,403			0.02
	Total	$	1,359,679	0.33	%	$	1,288,709		0.34	%
	The maturity of certificate of deposit accounts at December 31, 2014 is as follows (dollars in thousands):
	Maturing in:
	2015	$	178,036
	2016	11,707
	2017	8,230
	2018	4,407
	2019	19,357
	Total	$	221,737
	Certificates of deposit with balances greater than or equal to $100,000 totaled $170.6 million and $157.5 million at December 31, 2014 and 2013, respectively. Deposit accounts in the Bank are insured by the FDIC, generally up to a maximum of $250,000 per account owner.
	Interest expense by type of deposit is as follows:
	(Dollars in thousands)	2014		2013			2012
	Savings	$	3,369	$	3,035		$	4,294
	Certificates of deposit and money market	1,075		1,232			1,606
	Checking and Super NOW	30		29			36
	Total	$	4,474	$	4,296		$	5,936
	At December 31, 2014 and 2013, overdrawn deposit accounts totaled $77,000 and $97,000, respectively, and have been reclassified as loans in the consolidated balance sheets.

Advances_from_the_Federal_Home

Advances from the Federal Home Loan Bank	12 Months Ended
	Dec. 31, 2014
Advances from the Federal Home Loan Bank
Advances from the Federal Home Loan Bank
	(13)Advances from the Federal Home Loan Bank
	The FHLB advances are secured by a blanket pledge on the Bank’s assets not otherwise pledged. At December 31, 2014 and 2013, the Company had available additional unused FHLB advances of approximately $399.0 million and $375.3 million, respectively.
	Advances outstanding consisted of the following:
		December 31,
		2014				2013				2012
				Weighted				Weighted				Weighted
				Average				Average				Average
	(Dollars in thousands)	Amount		Rate		Amount		Rate		Amount		Rate
	Due within one year	$	10,000	2.06	%	$	—	—	%	$	10,000	2.12	%
	Due over 1 year to 2 years	—		—		10,000		2.06		—		—
	Due over 2 years to 3 years	—		—		—		—		10,000		2.06
	Due over 3 years to 4 years	5,000		1.20		—		—		—		—
	Due over 4 years to 5 years	—		—		5,000		1.20		—		—
	Total	$	15,000	1.77	%	$	15,000	1.77	%	$	20,000	2.09	%

Securities_Sold_Under_Agreemen

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2014
Securities Sold Under Agreements to Repurchase
Securities Sold Under Agreements to Repurchase
	(14) Securities Sold Under Agreements to Repurchase
	Securities sold under agreements to repurchase are treated as financings and the obligations to repurchase the identical securities sold are reflected as a liability with the dollar amount of securities underlying the agreements remaining in the asset accounts. Securities sold under agreements to repurchase are summarized as follows:
		December 31,
		2014				2013
				Weighted					Weighted
		Repurchase		Average		Repurchase			Average
	(Dollars in thousands)	Liability		Rate		Liability			Rate
	Maturing:
	1 year or less	$	47,000	2.11	%	$	—		—	%
	Over 1 year to 2 years	—		—		47,000			2.11
	Over 2 years to 3 years	25,000		1.46		—			—
	Over 3 years to 4 years	—		—		25,000			1.46
	Total	$	72,000	1.88	%	$	72,000		1.88	%
	During the year ended December 31, 2012, the Company prepaid $25.0 million of securities sold under agreements to repurchase and incurred $321,000 of prepayment penalties, which is reported as loss on extinguishment of debt in the consolidated statements of income.
	Below is a summary comparing the carrying value and fair value of securities pledged to secure repurchase agreements, the repurchase liability, and the amount at risk at December 31, 2014. The amount at risk is the greater of the carrying value or fair value over the repurchase liability.  All the agreements to repurchase are with JP Morgan Securities and the securities pledged are issued and guaranteed by U.S. government-sponsored enterprises.
												Weighted
		Carrying		Fair								Average
		Value of		Value of			Repurchase			Amount		Months to
	(Dollars in thousands)	Securities		Securities			Liability			at Risk		Maturity
	Maturing:
	Over 90 days	$	75,251	$	76,600		$	72,000		$	4,600	13

Offsetting_of_Financial_Liabil

Offsetting of Financial Liabilities	12 Months Ended
	Dec. 31, 2014
Offsetting of Financial Liabilities
Offsetting of Financial Liabilities
	(15) Offsetting of Financial Liabilities
	Securities sold under agreements to repurchase are subject to a conditional right of offset in the event of default.  See Footnote 14, Securities Sold Under Agreements to Repurchase, for additional information.
		Gross Amount		Gross Amount		Net Amount of		Gross Amount Not Offset in the
						Liabilities		Balance Sheet
	(Dollars in thousands)	of Recognized		Offset in the		Presented in the		Financial		Cash Collateral		Net Amount
		Liabilities		Balance Sheet		Balance Sheet		Instruments		Pledged
	December 31, 2014:
	Securities sold under agreements to repurchase	$	72,000	$	—	$	72,000	$	72,000	$	—	$	—
	December 31, 2013:
	Securities sold under agreements to repurchase	$	72,000	$	—	$	72,000	$	72,000	$	—	$	—

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Taxes
Income Taxes
	(16) Income Taxes
	Allocation of federal and state income taxes between current and deferred provisions is as follows:
	(Dollars in thousands)	2014			2013			2012
	Current
	Federal	$	8,047		$	8,746		$	7,221
	State	1,984			1,956			1,668
		10,031			10,702			8,889
	Deferred
	Federal	(730		)	(1,531		)	(500		)
	State	(392		)	(325		)	(92		)
		(1,122		)	(1,856		)	(592		)
	Total	$	8,909		$	8,846		$	8,297
	The federal statutory corporate tax rate for the years ended December 31, 2014, 2013 and 2012 was 35%. A reconciliation of the tax provision based on the statutory corporate rate on pretax income and the provision for taxes as shown in the accompanying consolidated statements of income is as follows:
	(Dollars in thousands)	2014			2013			2012
	Income tax expense at statutory rate	$	8,052		$	8,223		$	8,097
	Income tax effect of:
	Other tax-exempt income	(371		)	(373		)	(330		)
	Share-based compensation	83			(188		)	(307		)
	State income taxes, net of federal income tax benefits	1,035			1,060			1,024
	Other	110			124			(187		)
	Total income tax expense	$	8,909		$	8,846		$	8,297
	Effective income tax rate	38.72		%	37.65		%	35.86		%
	The components of income taxes payable (receivable) are as follows:
		December 31,
	(Dollars in thousands)	2014			2013
	Current taxes payable (receivable):
	Federal	$	(875	)	$	(546	)
	State	1,701			1,960
		826			1,414
	Deferred taxes receivable:
	Federal	(5,610		)	(4,018		)
	State	(1,644		)	(1,057		)
		(7,254		)	(5,075		)
	Total	$	(6,428	)	$	(3,661	)
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below:
		December 31,
	(Dollars in thousands)	2014			2013
	Deferred tax assets:
	Premises and equipment	$	1,521		$	1,309
	Hawaii franchise tax	678			782
	Unfunded pension liability	2,099			1,381
	Allowance for loan losses	669			591
	Impaired asset write-down	2,503			2,580
	Employee benefit plans	2,750			1,880
	Equity incentive plan	1,475			1,286
	Unrealized loss on available-for-sale securities	48			49
	Deferred compensation	729			166
	Other	24			10
		12,496			10,034
	Deferred tax liabilities:
	Net deferred loan fees	2,619			2,155
	FHLB stock dividends	2,301			2,453
	Prepaid expense	122			121
	Premiums on loans sold	200			230
	Deferred compensation	—			—
		5,242			4,959
	Net deferred tax assets	$	7,254		$	5,075
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible, management believes it is more likely than not the Company will realize the benefits of these deductible differences. The amount of the deferred tax assets considered realizable, however, could be reduced in the near term if estimates of future taxable income are reduced. There was no valuation allowance for deferred tax assets as of December 31, 2014 and 2013.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Employee Benefit Plans
Employee Benefit Plans
	(17) Employee Benefit Plans
	The Company has a noncontributory defined benefit pension plan (Pension Plan) that covers substantially all employees with at least one year of service prior to December 31, 2008. The benefits are based on years of service and the employees’ compensation during the service period. The Company’s policy is to accrue the actuarially determined pension costs and to fund pension costs within regulatory guidelines. The Company reviews its assumptions on an annual basis and makes modifications to the assumptions based on current rates and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in accumulated other comprehensive income (AOCI) beginning in 2006 and amortized to net periodic benefit cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under the plan are reasonable based on its experience and market conditions.
	On November 4, 2008, the Board of Directors approved changes to the Company’s defined benefit pension plan. Effective December 31, 2008, there will be no further accrual of benefits for any participants, and benefits will not increase with any additional years of service. Employees already enrolled in the Pension Plan as of December 31, 2008 will be 100% vested if they have at least five years of service. For employees with less than five years of service, vesting would occur at the employee’s five-year anniversary date.
	In addition, the Company sponsors a Supplemental Employee Retirement Plan (SERP), a noncontributory supplemental retirement benefit plan, which covers certain current and former employees of the Company for amounts in addition to those provided under the Pension Plan.
	The following table sets forth the status of the Pension Plan and SERP at the dates indicated:
		Pension Plan						SERP
		December 31,
	(Dollars in thousands)	2014			2013			2014			2013
	Accumulated benefit obligation at end of year	$	17,687		$	14,966		$	8,754		$	8,595
	Change in projected benefit obligation:
	Benefit obligation at beginning of year	$	14,966		$	14,644		$	8,595		$	8,408
	Service cost	92			108			59			95
	Interest cost	727			611			117			109
	Actuarial loss (gain)	2,353			(59		)	—			—
	Benefits paid	(451		)	(338		)	(17		)	(17		)
	Benefit obligation at end of year	17,687			14,966			8,754			8,595
	Change in plan assets:
	Fair value of plan assets at beginning of year	12,723			11,659			—			—
	Actual return on plan assets	334			1,402			—			—
	Employer contributions	1,000			—			17			17
	Benefits paid	(451		)	(338		)	(17		)	(17		)
	Fair value of plan assets at end of year	13,606			12,723			—			—
	Funded status at end of year	$	(4,081	)	$	(2,243	)	$	(8,754	)	$	(8,595	)
	Amounts recognized in the consolidated balance sheets:
	Accounts payable and accrued expenses - liability	$	(4,081	)	$	(2,243	)	$	(8,754	)	$	(8,595	)
	Amounts recognized in accumulated other comprehensive loss:
	Net actuarial loss	$	8,355		$	5,542		$	—		$	—
	Prior service cost	—			—			—			—
	Accumulated other comprehensive loss, before tax	$	8,355		$	5,542		$	—		$	—
	The following table sets forth the changes recognized in accumulated other comprehensive loss for the years indicated:
		Pension Plan
		Year Ended December 31,
	(Dollars in thousands)	2014			2013
	Accumulated other comprehensive loss at beginning of year, before tax	$	5,542		$	6,295
	Actuarial net loss (gain) arising during the period	2,943			(590		)
	Amortizations (recognized in net periodic benefit cost):
	Actuarial loss	(130		)	(163		)
	Prior service cost	—			—
	Total recognized in other comprehensive loss	2,813			(753		)
	Accumulated other comprehensive loss at end of year, before tax	$	8,355		$	5,542
	For the years ended December 31, 2014 and 2013, the following weighted average assumptions were used to determine benefit obligations at the end of the year:
		Pension Plan				SERP
		Year Ended December 31,
		2014		2013		2014		2013
	Assumptions used to determine the year-end benefit obligations:
	Discount rate	4.10	%	4.90	%	5.06	%	5.02	%
	Rate of compensation increase	N/A		N/A		5.00	%	5.00	%
	The Company does not expect any plan assets to be returned to the Company during calendar year 2015.
	The dates used to determine retirement measurements for the Pension Plan were December 31, 2014 and 2013.
	The Company’s investment strategy for the defined benefit retirement plan is to maintain a consistent rate of return with primary emphasis on capital appreciation and secondary emphasis on income to enhance the purchasing power of the plan’s assets over the long-term and to preserve capital. The investment policy establishes a target allocation for each asset class that is reviewed periodically and rebalanced when considered appropriate. Normal target allocations at December 31, 2014 were 55% domestic equity securities, 10% international equity securities and 35% bonds.  Equity securities primarily include stocks, investment in exchange traded funds and large-cap, mid-cap and small-cap mutual funds.  Bonds include U.S. Treasuries, mortgage-backed securities and corporate bonds of companies in diversified industries. Other types of investments include money market funds and savings accounts opened with the Company.
	As of December 31, 2014 and 2013, the Pension Plan’s assets measured at fair value were classified as follows:
					Fair Value of Measurements at Report Date
					Using:
	(Dollars in thousands)	December 31,			Quoted Prices			Significant			Significant
		2014			in Active			Other			Unobservable
					Markets for			Observable			Inputs
					Identical			Inputs			(Level 3)
					Assets			(Level 2)
					(Level 1)
	December 31, 2014:
	Cash	$	1,041		$	1,041		$	—		$	—
	Money market funds	1,274			1,274			—			—
	Equities	7,720			7,720			—			—
Mutual funds (a)	3,571			3,571			—			—
Total	$	13,606		$	13,606		$	—		$	—
December 31, 2013:
Cash	$	225		$	225		$	—		$	—
Money market funds	609			609			—			—
Equities	1,400			1,400			—			—
Mutual funds (a)	10,489			10,489			—			—
Total	$	12,723		$	12,723		$	—		$	—
(a) This category includes mutual funds that invest in equities and bonds.  The mutual fund managers have the ability to change the amounts invested in equities and bonds depending on their investment outlook.
Estimated future benefit payments reflecting expected future service at December 31, 2014 are as follows:
	Pension
(Dollars in thousands)	Plan			SERP
2015	$	721		$	6,516
2016	745			17
2017	762			17
2018	798			53
2019	858			161
2020 — 2024	4,916			3,220
Total	$	8,800		$	9,984
For the fiscal years ended December 31, 2014, 2013, and 2012, the following weighted average assumptions were used to determine net periodic benefit cost for the fiscal years shown:
	Pension Plan						SERP
	Year Ended December 31,
(Dollars in thousands)	2014		2013		2012		2014		2013		2012
Assumptions used to determine the net periodic benefit cost:
Discount rate	4.90	%	4.20	%	4.90	%	5.06	%	5.06	%	5.05	%
Expected return on plan assets	7.50		7.75		7.75		—		—		—
Rate of compensation increase	N/A		N/A		N/A		5.00		5.00		5.00
The components of net periodic benefit cost were as follows:
	Pension Plan									SERP
	Year Ended December 31,
(Dollars in thousands)	2014			2013			2012			2014			2013		2012
Net periodic benefit cost for the year:
Service cost	$	92		$	108		$	117		$	59		$	95	$	158
Interest cost	727			611			625			117			109		98
Expected return on plan assets	(924		)	(870		)	(845		)	—			—		—
Amortization of prior service cost	—			—			—			—			—		—
Recognized actuarial loss	130			163			117			—			—		—
Recognized curtailment loss	—			—			—			—			—		—
Net periodic benefit cost	$	25		$	12		$	14		$	176		$	204	$	256
The estimated prior service cost and net actuarial loss that will be amortized from AOCI into net periodic pension benefit cost in 2015 are $0 and $197,000, respectively.
The expected return on plan assets is based on the weighted-average long-term rates of return for the types of assets held in the plan. The expected return on plan assets is adjusted when there is a change in the expected long-term rate of return or in the composition of assets held in the plan.  The discount rate is based on the return of high-quality fixed-income investments that can be used to fund the benefit payments under the Company’s defined benefit plan.
Based on actuarial calculations, the Company is not expected to make a contribution to the defined benefit pension plan in 2015. The Company expects to make a $6.5 million contribution to the SERP in 2015 to cover actual benefit payments.
The Company also has a 401(k) defined contribution plan and profit sharing plan covering all employees after one year of service. The 401(k) plan provides for employer matching contributions, as determined by the Company, based on a percentage of employees’ contributions subject to a maximum amount defined in the plan agreement. The Company’s 401(k) matching contributions, based on 5% of employees’ contributions for 2014, 2013 and 2012, amounted to $50,000, $51,000, and $50,000, respectively. The Company contributes to the profit sharing plan an amount determined by the Board of Directors. No contributions were made to the profit sharing plan for years ended December 31, 2014, 2013, and 2012.

Employee_Stock_Ownership_Plan

Employee Stock Ownership Plan (Employee Stock Ownership Plan)	12 Months Ended
	Dec. 31, 2014
Employee Stock Ownership Plan
Employee Stock Ownership Plan
Employee Stock Ownership Plan
	(18)Employee Stock Ownership Plan
	Effective January 1, 2009, Territorial Savings Bank adopted an Employee Stock Ownership Plan (ESOP) for eligible employees.  The ESOP borrowed $9.8 million from the Company and used those funds to acquire 978,650 shares, or 8%, of the total number of shares issued by the Company in its initial public offering.  The shares were acquired at a price of $10.00 per share.
	The loan is secured by the shares purchased with the loan proceeds and will be repaid by the ESOP over the 20-year term of the loan with funds from Territorial Savings Bank’s contributions to the ESOP and dividends payable on the shares.  The interest rate on the ESOP loan is an adjustable rate equal to the prime rate, as published in The Wall Street Journal.  The interest rate adjusts annually and will be the prime rate on the first business day of the calendar year.
	Shares purchased by the ESOP are held by a trustee in an unallocated suspense account, and shares are released annually from the suspense account on a pro-rata basis as principal and interest payments are made by the ESOP to the Company.  The trustee allocates the shares released among participants on the basis of each participant’s proportional share of compensation relative to all participants.  As shares are committed to be released from the suspense account, Territorial Savings Bank reports compensation expense based on the average fair value of shares released with a corresponding credit to stockholders’ equity.  The shares committed to be released are considered outstanding for earnings per share computations.  Compensation expense recognized for the years ended December 31, 2014 and 2013 amounted to $872,000 and $1.0 million, respectively.
	Shares held by the ESOP trust were as follows:
		December 31,
		2014		2013
	Allocated shares	283,381		239,241
	Unearned shares	685,057		733,989
	Total ESOP shares	968,438		973,230
	Fair value of unearned shares, in thousands	$	14,763	$	17,029
	The ESOP restoration plan is a non-qualified plan that provides supplemental benefits to certain executives who are prevented from receiving the full benefits contemplated by the employee stock ownership plan’s benefit formula.  The supplemental cash payments consist of payments representing shares that cannot be allocated to the participants under the ESOP due to IRS limitations imposed on tax-qualified plans. We accrue for these benefits over the period during which employees provide services to earn these benefits.  For the years ended December 31, 2014 and 2013, we accrued $231,000 and $296,000, respectively, for the ESOP restoration plan.

ShareBased_Compensation

Share-Based Compensation (2010 Equity Incentive Plan)	12 Months Ended
	Dec. 31, 2014
2010 Equity Incentive Plan
Share-Based Compensation
Share-Based Compensation
	(19)Share-Based Compensation
	On August 19, 2010, Territorial Bancorp Inc. adopted the 2010 Equity Incentive Plan, which provides for awards of stock options and restricted stock to key officers and outside directors.  In accordance with the Compensation — Stock Compensation topic of the FASB ASC, the cost of the 2010 Equity Incentive Plan is based on the fair value of the awards on the grant date.  The fair value of restricted stock is based on the closing price of the Company’s stock on the grant date.  The fair value of stock options is estimated using a Black-Scholes option pricing model using assumptions for dividend yield, stock price volatility, risk-free interest rate and option term.  These assumptions are based on our judgments regarding future events, are subjective in nature, and cannot be determined with precision.  The cost of the awards will be recognized on a straight-line basis over the five- to six-year vesting period during which participants are required to provide services in exchange for the awards.
	The Company recognized compensation expense, measured as the fair value of the share-based award on the date of grant, on a straight-line basis over the vesting period.  Share-based compensation is recorded in the statement of income as a component of salaries and employee benefits with a corresponding increase in stockholders’ equity.  The table below presents information on compensation expense and the related tax benefit for all share-based awards:
	(In thousands)	2014			2013			2012
	Compensation expense	$	2,676		$	2,676		$	2,690
	Income tax benefit	1,074			1,291			1,432
	Shares of our common stock issued under the 2010 Equity Incentive Plan shall be authorized but unissued shares.  The maximum number of shares that will be awarded under the plan will be 1,712,637 shares.
	Stock Options
	The table below presents the stock option activity of the Company:
		Options		Weighted			Remaining		Aggregate
				Average			Contractual		Intrinsic
				Exercise			Life (years)		Value
				Price					(in thousands)
	Options outstanding at December 31, 2011	871,144		$	17.36		8.67		$	2,082
	Granted	3,085		23.62			9.67		—
	Exercised	41,275		17.36			—		171
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2012	832,954		$	17.38		7.67		$	4,554
	Granted	—		—			—		—
	Exercised	—		—			—		—
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2013	832,954		$	17.38		6.68		$	4,845
	Granted	—		—			—		—
	Exercised	—		—			—		—
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2014	832,954		$	17.38		5.68		$	3,471
	Options vested and exercisable at December 31, 2014	555,097		$	17.38		5.68		$	2,314
	The following summarizes certain stock option activity of the Company:
	(In thousands)	2014			2013			2012
	Intrinsic value of stock options exercised	$	—		$	—		$	171
	Cash received from stock options exercised	—			—			717
	Tax benefits realized from stock options exercised	—			—			69
	Total fair value of stock options that vested	2,852			3,223			3,175
	As of December 31, 2014, the Company had $1.2 million of unrecognized compensation costs related to the stock option plan.  The cost of the stock option plan is being amortized over the five- or six-year vesting period.  There were 138,929 shares vested in 2014.
	Restricted Stock Awards
	Restricted stock awards are accounted for as fixed grants using the fair value of the Company’s stock at the time of grant.  Unvested restricted stock awards may not be disposed of or transferred during the vesting period.  Restricted stock awards carry with them the right to receive dividends.
	The table below presents the restricted stock award activity:
		Restricted		Weighted
		Stock Awards		Average Grant
				Date Fair
				Value
	Nonvested at December 31, 2011	563,994		$	17.36
	Granted	2,735		23.62
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2012	453,397		$	17.39
	Granted	—		—
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2013	340,065		$	17.39
	Granted	—		—
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2014	226,733		$	17.39
	As of December 31, 2014, the Company had $3.3 million of unrecognized compensation costs related to restricted stock awards.  The cost of the restricted stock awards is being amortized over the five- or six-year vesting period.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share
Earnings Per Share
	(20)Earnings Per Share
	The table below presents the information used to compute basic and diluted earnings per share:
		For the Year Ended December 31,
	(Dollars in thousands, except per share data)	2014		2013		2012
	Net income	$	14,097	$	14,647	$	14,838
	Weighted-average number of shares used in:
	Basic earnings per share	9,211,409		9,711,233		10,113,453
	Dilutive common stock equivalents:
	Stock options and restricted stock units	105,914		133,709		99,737
	Diluted earnings per share	9,317,323		9,844,942		10,213,190
	Net income per common share, basic	$	1.53	$	1.51	$	1.47
	Net income per common share, diluted	$	1.51	$	1.49	$	1.45

Other_Comprehensive_Loss

Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2014
Other Comprehensive Loss
Other Comprehensive Loss
	(21)Other Comprehensive Loss
	The table below presents the changes in the components of accumulated other comprehensive loss, net of taxes:
	(Dollars in thousands)	Unfunded			Noncredit			Unrealized			Total
		Pension			Related			Loss on
		Liability			Losses on			Securities
					Securities
					Not Expected
					to Be Sold
	December 31, 2014:
	Balances at beginning of period	$	3,338		$	376		$	73		$	3,787
	Other comprehensive income before reclassifications	1,694			(92		)	(1		)	1,601
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	1,694			(92		)	(1		)	1,601
	Balances at end of period	$	5,032		$	284		$	72		$	5,388
	December 31, 2013:
	Balances at beginning of period	$	3,792		$	445		$	96		$	4,333
	Other comprehensive income before reclassifications	(454		)	(69		)	(23		)	(546		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	(454		)	(69		)	(23		)	(546		)
	Balances at end of period	$	3,338		$	376		$	73		$	3,787
	December 31, 2012:
	Balances at beginning of period	$	2,966		$	679		$	125		$	3,770
	Other comprehensive income before reclassifications	826			(234		)	(29		)	563
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	826			(234		)	(29		)	563
	Balances at end of period	$	3,792		$	445		$	96		$	4,333
	The table below presents the tax effect on each component of other comprehensive loss:
		Year Ended December 31,
		2014									2013								2012
	(Dollars in thousands)	Pretax			Tax			After Tax			Pretax			Tax		After Tax			Pretax			Tax			After Tax
		Amount						Amount			Amount					Amount			Amount						Amount
	Unfunded pension liability	$	2,813		$	(1,119	)	$	1,694		$	(753	)	$	299	$	(454	)	$	1,341		$	(515	)	$	826
	Noncredit related losses on securities not expected to be sold	(153		)	61			(92		)	(116		)	47		(69		)	(389		)	155			(234		)
	Unrealized loss on securities	(2		)	1			(1		)	(38		)	15		(23		)	(49		)	20			(29		)
	Total	$	2,658		$	(1,057	)	$	1,601		$	(907	)	$	361	$	(546	)	$	903		$	(340	)	$	563

Commitments

Commitments	12 Months Ended
	Dec. 31, 2014
Commitments
Commitments
	(22)Commitments
	(a)Loan Commitments
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any terms or conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on an individual basis. The Company’s policy is to require suitable collateral, primarily real estate, to be provided by customers prior to disbursement of approved loans. At December 31, 2014 and 2013, the Company had loan commitments aggregating to $18.1 million (interest rates from 2.750% to 5.500%) and $15.0 million (interest rates from 3.125% to 5.375%), respectively, primarily consisting of fixed-rate residential first mortgage loans.  In addition to commitments to originate loans, at December 31, 2014 and 2013, the Company had $24.9 million and $23.7 million, respectively, in unused lines of credit to borrowers.
	(b)Lease Commitments
	The Company leases a majority of its premises under operating leases expiring on various dates through 2025. Total rental expense comprised minimum rentals of $2.8 million, $2.7 million, and $2.6 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	At December 31, 2014, future minimum rental commitments under all noncancelable operating leases are as follows:
	(Dollars in thousands)
	2015	$	2,641
	2016	2,458
	2017	2,211
	2018	1,547
	2019	1,109
	Thereafter	1,529
	Total	$	11,495
	Certain leases are renegotiable during the period of the lease or have renewal options at the expiration of the lease term. The majority of lease agreements relates to real estate and generally provides that the Company pay taxes, maintenance, insurance, and certain other operating expenses applicable to the leased premises.
	In addition, the Company leases to a tenant certain property that it owns. Future minimum rental income for this noncancelable lease is as follows:
	(Dollars in thousands)
	2015	$	110
	2016	110
	2017	110
	2018	110
	2019	110
	Thereafter	220
	Total	$	770
	Rental income comprised of minimum rentals for 2014, 2013, and 2012 was approximately $110,000 each year.
	(c)Reserve Requirements
	The Company is required by the Federal Reserve Bank to maintain reserves based on the amount of deposits held. The reserve requirement at December 31, 2014 and 2013 was $9.6 million and $8.4 million, respectively, and the Company met such requirements.

Regulatory_Capital_and_Supervi

Regulatory Capital and Supervision (Territorial Savings Bank)	12 Months Ended
	Dec. 31, 2014
Territorial Savings Bank
Regulatory capital and supervision
Regulatory Capital and Supervision
	(23)Regulatory Capital and Supervision
	The Bank is subject to various regulatory capital requirements administered by the federal banking agencies.  At December 31, 2014 and 2013, the Bank’s core, tangible, risk-based, and Tier 1 risk-based capital exceeded the minimum required regulatory capital ratios as follows:
		Required					Actual				Excess over
	(Dollars in thousands)	Amount			Percentage		Amount		Percentage		requirement
	December 31, 2014:
	Core (Tier 1) capital	$	151,548		9.00	%	$	203,708	12.10	%	$	52,160
	Tangible capital	25,258			1.50		203,708		12.10		178,450
	Risk-based capital	54,902			8.00		205,403		29.93		150,501
	Tier 1 risk-based capital	27,451			4.00		203,708		29.68		176,257
	December 31, 2013:
	Core (Tier 1) capital	$	64,817		4.00	%	$	200,074	12.35	%	$	135,257
	Tangible capital	24,307			1.50		200,074		12.35		175,767
	Risk-based capital	50,407			8.00		201,566		31.99		151,159
	Tier 1 risk-based capital	25,204			4.00		200,074		31.75		174,870
	As a condition of its membership in the Federal Reserve Bank of San Francisco, the Bank’s core (tier 1) capital requirement over the next three years is 9.00%.
	The following is a reconciliation of Bank equity to regulatory capital:
		December 31,
	(Dollars in thousands)	2014			2013
	Bank equity	$	198,370		$	196,563
	Intangible assets	—			(251		)
	Disallowed servicing assets	(51		)	(25		)
	Accumulated other comprehensive loss	5,388			3,787
	Core and tangible capital	203,707			200,074
	Allowance for loan losses — general, including allowance for credit losses on off-balance sheet credit exposures	1,695			1,492
	Regulatory risk-based capital — computed	$	205,402		$	201,566
	(a)Federal Deposit Insurance Corporation Improvement Act (FDICIA)
	FDICIA was signed into law and regulations implementing the Prompt Corrective Action provisions of FDICIA became effective on December 19, 1992. In addition to the Prompt Corrective Action requirements, FDICIA includes significant changes to the legal and regulatory environment for insured depository institutions, including reductions in insurance coverage for certain kinds of deposits; increased supervision by the federal regulatory agencies; increased reporting requirements for insured institutions; and new regulations concerning internal controls, accounting, and operations.
	The Prompt Corrective Action provisions define specific capital categories based on an institution’s capital ratios. However, the regulators may impose higher minimum capital standards on individual institutions or may downgrade an institution from one capital category to a lower category because of safety and soundness concerns. Failure to meet minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements.
	The Prompt Corrective Action provisions impose certain restrictions on institutions that are undercapitalized. The restrictions imposed become increasingly more severe as an institution’s capital category declines from “undercapitalized” to “critically undercapitalized.”
	At December 31, 2014 and 2013, the Bank’s core, tangible, Tier 1/risk-based, and total risk-based ratios exceeded the minimum capital thresholds for a “well-capitalized” institution. There are no conditions or events that have changed the institution’s category under the capital guidelines.
	Depending on the amount of dividends to be paid, the Bank is required to either notify or make application to the Federal Reserve Bank before dividends are paid to the parent company.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2014
Contingencies
Contingencies
	(24)Contingencies
	The Company is involved in various claims and legal actions arising out of the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s consolidated balance sheets or consolidated statements of income.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value of Financial Instruments
Fair Value of Financial Instruments
	(25)Fair Value of Financial Instruments
	In accordance with the Fair Value Measurements and Disclosures topic of the FASB ASC, the Company groups its financial assets and liabilities at fair value into three levels based on the markets in which the financial assets and liabilities are traded and the reliability of the assumptions used to determine fair value as follows:
	Level 1 — Valuation is based upon quoted prices (unadjusted) for identical assets or liabilities traded in active markets. A quoted price in an active market provides the most reliable evidence of fair value and shall be used to measure fair value whenever available.
	Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.
	Level 3 — Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect management’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of discounted cash flow models and similar techniques that require the use of significant judgment or estimation.
	In accordance with the Fair Value Measurements and Disclosures topic, the Company bases its fair values on the price that it would expect to receive if an asset were sold or the price that it would expect to pay to transfer a liability in an orderly transaction between market participants at the measurement date.  Also as required, the Company maximizes the use of observable inputs and minimizes the use of unobservable inputs when developing fair value measurements.
	The Company uses fair value measurements to determine fair value disclosures.  Investment securities held for sale and derivatives are recorded at fair value on a recurring basis.  From time to time, the Company may be required to record other financial assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans and investments, and mortgage servicing assets. These nonrecurring fair value adjustments typically involve application of the lower of cost or fair value accounting or write-downs of individual assets.
	Cash and Cash Equivalents, Accrued Interest Receivable, Accounts Payable and Accrued Expenses, Current Income Taxes Payable, and Advance Payments by Borrowers for Taxes and Insurance. The carrying amount approximates fair value because of the short maturity of these instruments.
	Investment Securities.  The estimated fair values of U.S. government-sponsored mortgage-backed securities are considered Level 2 inputs because the valuation for investment securities utilized pricing models that varied based on asset class and included trade, bid and other observable market information.
	The trust preferred securities represent investments in a pool of debt obligations issued primarily by holding companies for Federal Deposit Insurance Corporation-insured financial institutions.  The trust preferred securities market is considered to be inactive as only five transactions have occurred over the past 36 months in the same tranche of securities we own and no new issues of pooled trust preferred securities have occurred since 2007.  The fair value of our trust preferred securities was determined using a discounted cash flow model.  Our model used a discount rate equal to three-month LIBOR plus 20.00% and provided a fair value estimate of $19.47 per $100 of par value for PreTSL XXIII.
	The discounted cash flow analysis includes a review of all issuers within the pool.  The fair value of the trust preferred securities are classified as Level 3 inputs because they are based on discounted cash flow models.
	FHLB Stock. FHLB stock, which is redeemable for cash at par value, is reported at its par value.
	FRB Stock. FRB stock, which is redeemable for cash at par value, is reported at its par value.
	Loans. The fair value of loans 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.  The fair value of loans is not based on the concept of exit price.
	Loans Held for Sale. The fair value of loans held for sale is determined based on prices quoted in the secondary market for similar loans.
	Deposits. The fair value of checking and Super NOW savings accounts, passbook accounts, and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated by discounting future cash flows using the rates currently offered for deposits with similar remaining maturities.
	Advances From the FHLB and Securities Sold Under Agreements to Repurchase. Fair value is estimated by discounting future cash flows using the rates currently offered to the Company for debt with similar remaining maturities.
	Interest Rate Contracts.  The Company may enter into interest rate lock commitments with borrowers on loans intended to be sold.  To manage interest rate risk on the lock commitments, the Company may also enter into forward loan sale commitments. The interest rate lock commitments and forward loan sale commitments are treated as derivatives and are recorded at their fair value determined by referring to prices quoted in the secondary market for similar contracts.  Interest rate contracts that are classified as assets are included with prepaid expenses and other assets on the consolidated balance sheet while interest rate contracts that are classified as liabilities are included with accounts payable and accrued expenses.
	The estimated fair values of the Company’s financial instruments are as follows:
			Carrying					Fair Value Measurements Using
	(Dollars in thousands)		Amount		Fair Value			Level 1		Level 2			Level 3
	December 31, 2014:
	Assets
	Cash and cash equivalents		$	75,060	$	75,060		$	75,060	$	—		$	—
	Investment securities held to maturity		572,922		586,710			—		586,020			690
	FHLB stock		11,234		11,234			—		11,234			—
	FRB stock		2,925		2,925			—		2,925			—
	Loans held for sale		1,048		1,079			—		1,079			—
	Loans receivable, net		968,212		998,183			—		—			998,183
	Accrued interest receivable		4,436		4,436			4,436		—			—
	Interest rate contracts		62		62			—		62			—
	Liabilities
	Deposits		1,359,679		1,360,074			1,137,942		—			222,132
	Advances from the Federal Home Loan Bank		15,000		14,977			—		—			14,977
	Securities sold under agreements to repurchase		72,000		72,334			—		—			72,334
	Accounts payable and accrued expenses (excluding interest rate contracts)		24,044		24,044			24,044		—			—
	Interest rate contracts		54		54			—		54			—
	Current income taxes payable		826		826			826		—			—
	Advance payments by borrowers for taxes and insurance		3,916		3,916			3,916		—			—
	December 31, 2013:
	Assets
	Cash and cash equivalents		$	75,365	$	75,365		$	75,365	$	—		$	—
	Investment securities held to maturity		613,436		598,007			—		597,470			537
	FHLB stock		11,689		11,689			—		11,689			—
	Loans held for sale		2,210		2,252			—		2,252			—
	Loans receivable, net		856,542		880,852			—		—			880,852
	Accrued interest receivable		4,310		4,310			4,310		—			—
	Interest rate contracts		25		25			—		25			—
	Liabilities
	Deposits		1,288,709		1,289,348			1,078,712		—			210,636
	Advances from the Federal Home Loan Bank		15,000		15,110			—		—			15,110
	Securities sold under agreements to repurchase		72,000		73,151			—		—			73,151
	Accounts payable and accrued expenses (excluding interest rate contracts)		23,905		23,905			23,905		—			—
	Interest rate contracts		28		28			—		28			—
	Current income taxes payable		1,414		1,414			1,414		—			—
	Advance payments by borrowers for taxes and insurance		3,708		3,708			3,708		—			—
	At December 31, 2014 and 2013, neither the commitment fees received on commitments to extend credit nor the fair value thereof was material to the consolidated financial statements of the Company.
	The table below presents the balance of assets and liabilities measured at fair value on a recurring basis:
	(Dollars in thousands)		Level 1		Level 2			Level 3		Total
	December 31, 2014:
	Interest rate contracts — assets		$	—	$	62		$	—	$	62
	Interest rate contracts — liabilities		—		(54		)	—		(54		)
	December 31, 2013:
Interest rate contracts — assets		$	—	$	25		$	—	$	25
Interest rate contracts — liabilities		—		(28		)	—		(28		)
The fair value of interest rate contracts was determined by referring to prices quoted in the secondary market for similar contracts. Gains and losses are included in gain on sale of loans in the consolidated statements of income.
The table below presents the balance of assets measured at fair value on a nonrecurring basis as of December 31, 2014 and 2013 and the related gains and losses for the years then ended:
(Dollars in thousands)		Level 1		Level 2			Level 3		Total			Total Gains
												(Losses)
December 31, 2014:
Impaired loans		$	—	$	—		$	327	$	327		$	(4	)
Trust preferred securities		—		—			690		690			153
Mortgage servicing assets		—		—			505		505			(15		)
December 31, 2013:
Impaired loans		$	—	$	—		$	5,456	$	5,456		$	76
Trust preferred securities		—		—			537		537			116
The fair value of impaired loans that are considered to be collateral-dependent is determined using the value of collateral less estimated selling costs. The fair value of impaired loans not considered to be collateral-dependent is determined using a discounted cash flow analysis.  Assumptions used in the analysis include the discount rate and projected cash flows.  Gains and losses on impaired loans are included in the provision for loan losses in the consolidated statements of income.  Mortgage servicing assets are valued using a discounted cash flow model.  Assumptions used in the model include mortgage prepayment speeds, discount rates, cost of servicing and ancillary income.  Losses on mortgage servicing assets are included in service fees on loan and deposit accounts in the consolidated statements of income.  The fair value of trust preferred securities is determined using a discounted cash flow model.  The assumptions used in the discounted cash flow model are discussed above.  Gains and losses on trust preferred securities that are credit related are included in net other-than-temporary impairment losses in the consolidated statements of income.  Gains and losses on trust preferred securities that are not credit related are included in other comprehensive income in the consolidated statements of comprehensive income.
The table below presents the significant unobservable inputs for Level 3 nonrecurring fair value measurements:
(Dollars in thousands)		Fair Value		Valuation Technique		Unobservable		Value
						Input
December 31, 2014:
Impaired loans — non-collateral dependent		$	327	Discounted cash flow		Discount rate (1)		6.10%
Trust preferred securities		690		Discounted cash flow		Discount rate		Three-month LIBOR plus 20%
Mortgage servicing assets		505		Discounted cash flow		Discount rate		10.50%
						Prepayment speed (PSA)		164.8 – 262.5
						Annual cost to service (per loan)		$55
December 31, 2013:
Impaired loans — non-collateral dependent		$	5,456	Discounted cash flow		Discount rate (1)		3.15% - 6.94%
Trust preferred securities		537		Discounted cash flow		Discount rate		Three-month LIBOR plus 20%
	-1		Represents the yield on contractual cash flows prior to modification in troubled debt restructurings.

Parent_Company_Only

Parent Company Only (Territorial Bancorp Inc.)	12 Months Ended
	Dec. 31, 2014
Territorial Bancorp Inc.
Consolidated financial statements
Parent Company Only
	(26)Parent Company Only
	Presented below are the condensed balance sheet, statement of income, and statement of cash flows for Territorial Bancorp Inc.
	Condensed Balance Sheet
		December 31,
	(Dollars in thousands)	2014			2013
	Assets
	Cash	$	16,155		$	13,079
	Investment in Territorial Savings Bank	198,370			196,563
	Receivable from Territorial Savings Bank	2,262			933
	Prepaid expenses and other assets	23			2,103
	Total assets	$	216,810		$	212,678
	Liabilities and Equity
	Other liabilities	$	432		$	538
	Equity	216,378			212,140
	Total liabilities and equity	$	216,810		$	212,678
	Condensed Statement of Income
		For the Year Ended December 31,
	(Dollars in thousands)	2014			2013			2012
	Interest and dividend income:
	Dividends from Territorial Savings Bank	$	14,000		$	25,000		$	11,788
	Interest-earning deposit with Territorial Savings Bank	20			26			32
	Total interest and dividend income	14,020			25,026			11,820
	Noninterest expense:
	Salaries	37			37			37
	Other general and administrative expenses	837			728			763
	Total noninterest expense	874			765			800
	Income before income taxes and equity in undistributed earnings in subsidiaries	13,146			24,261			11,020
	Income taxes	(360		)	(299		)	(297		)
	Income before equity in undistributed earnings in subsidiaries	13,506			24,560			11,317
	Equity in undistributed earnings of Territorial Savings Bank, net of dividends	591			(9,913		)	3,521
	Net income	$	14,097		$	14,647		$	14,838
	Condensed Statement of Cash Flows
		For the Year Ended December 31,
	(Dollars in thousands)	2014			2013			2012
	Cash flows from operating activities:
	Net income	$	14,097		$	14,647		$	14,838
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of Territorial Savings Bank, net of dividends	(591		)	9,913			(3,521		)
	ESOP expense	1,036			1,125			1,082
	Excess tax benefits from share-based compensation	—			—			(54		)
	Net decrease in prepaid expenses and other assets	751			2,325			172
	Net increase (decrease) in other liabilities	29			526			(136		)
	Net cash provided by operating activities	15,322			28,536			12,381
	Cash flows from investing activities:
	Investment in Territorial Savings Bank	—			—			—
	Net cash used in investing activities	—			—			—
	Cash flows from financing activities:
	Excess tax benefits from share-based compensation	—			—			54
	Proceeds from issuance of common stock, net of costs	—			—			717
	Repurchases of company stock	(5,612		)	(19,595		)	(8,025		)
	Cash dividends paid	(6,634		)	(6,231		)	(5,728		)
	Net cash used in financing activities	(12,246		)	(25,826		)	(12,982		)
	Net increase (decrease) in cash	3,076			2,710			(601		)
	Cash at beginning of the period	13,079			10,369			10,970
	Cash at end of the period	$	16,155		$	13,079		$	10,369

Unaudited_Quarterly_Financial_

Unaudited Quarterly Financial Information	12 Months Ended
	Dec. 31, 2014
Unaudited Quarterly Financial Information
Unaudited Quarterly Financial Information
	(27)Unaudited Quarterly Financial Information
		First		Second			Third		Fourth
		Quarter		Quarter			Quarter		Quarter			Full Year
		(Dollars in thousands, except per share data)
	2014:00:00
	Interest and dividend income	$	14,657	$	14,881		$	14,990	$	15,087		$	59,615
	Interest expense	1,500		1,512			1,551		1,555			6,118
	Net interest income	13,157		13,369			13,439		13,532			53,497
	Provision for loan losses	9		156			23		172			360
	Net interest income after provision for loan losses	13,148		13,213			13,416		13,360			53,137
	Noninterest income	1,358		1,279			1,398		1,142			5,177
	Noninterest expense	8,864		8,747			9,079		8,618			35,308
	Income before income taxes	5,642		5,745			5,735		5,884			23,006
	Income taxes	2,180		2,026			2,273		2,430			8,909
	Net income	3,462		3,719			3,462		3,454			14,097
	Basic earnings per share	0.38		0.41			0.38		0.37			1.53
	Diluted earnings per share	0.37		0.40			0.37		0.37			1.51
	Cash dividends declared per common share	0.14		0.15			0.15		0.26			0.70
		First		Second			Third		Fourth
		Quarter		Quarter			Quarter		Quarter			Full Year
		(Dollars in thousands, except per share data)
	2013:
	Interest and dividend income	$	13,882	$	13,783		$	14,091	$	14,419		$	56,175
	Interest expense	1,700		1,610			1,520		1,452			6,282
	Net interest income	12,182		12,173			12,571		12,967			49,893
	Provision (reversal of allowance) for loan losses	18		(16		)	45		(8		)	39
	Net interest income after provision for loan losses	12,164		12,189			12,526		12,975			49,854
	Noninterest income	2,360		2,311			2,323		1,722			8,716
	Noninterest expense	8,716		8,595			8,720		9,046			35,077
	Income before income taxes	5,808		5,905			6,129		5,651			23,493
	Income taxes	2,167		2,244			2,298		2,137			8,846
	Net income	3,641		3,661			3,831		3,514			14,647
	Basic earnings per share	0.37		0.37			0.4		0.37			1.51
	Diluted earnings per share	0.36		0.36			0.39		0.37			1.49
	Cash dividends declared per common share	0.12		0.13			0.13		0.24			0.62

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events
Subsequent Events
	(28)Subsequent Events
	On January 26, 2015, the Board of Directors of Territorial Bancorp Inc. declared a quarterly cash dividend of $0.16 per share of common stock.  The dividend was paid on February 23, 2015 to stockholders of record as of February 9, 2015.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies
Principles of Consolidation
	(b)Principles of Consolidation
	The consolidated financial statements include the accounts and results of operations of Territorial Bancorp Inc. and Territorial Savings Bank and its wholly-owned subsidiaries, Territorial Real Estate Co., Inc. and Territorial Financial Services, Inc. Significant intercompany balances and transactions have been eliminated in consolidation.
Cash and Cash Equivalents
	(c)Cash and Cash Equivalents
	Cash and cash equivalents includes cash and due from banks, interest-bearing deposits in other banks, federal funds sold, and short-term, highly liquid investments with original maturities of three months or less.
Investment Securities
	(d)Investment Securities
	The Company classifies and accounts for its investment securities as follows: (1) held-to-maturity debt securities in which the Company has the positive intent and ability to hold to maturity are reported at amortized cost; (2) trading securities that are purchased for the purpose of selling in the near term are reported at fair value, with unrealized gains and losses included in current earnings; and (3) available-for-sale securities not classified as either held-to-maturity or trading securities are reported at fair value, with unrealized gains and losses excluded from current earnings and reported as a separate component of equity. At December 31, 2014 and 2013, the Company classified all of its investments as held-to-maturity.
	A decline in the market value of any available-for-sale or held-to-maturity security below cost, that is deemed to be other than temporary, results in an impairment to reduce the carrying amount to fair value. To determine whether impairment is other than temporary, the Company considers whether it has the intent and ability not to sell and would not be required to sell for a sufficient period of time to recover the remaining amortized cost basis.
	Gains or losses on the sale of investment securities are computed using the specific-identification method. The Company amortizes premiums and accretes discounts associated with investment securities using the interest method over the contractual life of the respective investment security. Such amortization and accretion is included in the interest and dividend income line item in the consolidated statements of income. Dividend and interest income are recognized when earned.
Loans Receivable
	(e)Loans Receivable
	This policy applies to all loan classes.  Loans receivable are stated at the principal amount outstanding, less the allowance for loan losses, loan origination fees and costs, and commitment fees. Interest on loans receivable is accrued as earned. The Company has a policy of placing loans on a nonaccrual basis when 90 days or more contractually delinquent or when, in the opinion of management, collection of all or part of the principal balance appears doubtful. For nonaccrual loans, the Company records payments received as a reduction in principal.  The Company, considering current information and events regarding the borrowers’ ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, if the loan is considered to be collateral dependent, based on the fair value of the collateral less estimated costs to sell.  Impairment losses are written off against the allowance for loan losses. For impaired loans, the Company records payments received as a reduction in principal. A nonaccrual loan may be restored to an accrual basis when principal and interest payments are current and full payment of principal and interest is expected.
Loans Held for Sale
	(f)Loans Held for Sale
	Loans held for sale are stated at the lower of aggregate cost or market value. Net fees and costs of originating loans held for sale are deferred and are included in the basis for determining the gain or loss on sales of loans held for sale.
Deferred Loan Origination Fees and Unearned Loan Discounts
	(g)Deferred Loan Origination Fees and Unearned Loan Discounts
	Loan origination and commitment fees and certain direct loan origination costs are being deferred, and the net amount is recognized over the life of the related loan as an adjustment to yield. Net deferred loan fees are amortized using the interest method over the contractual term of the loan, adjusted for actual prepayments. Net unamortized fees on loans paid in full are recognized as a component of interest income.
Real Estate Owned
	(h)Real Estate Owned
	Real estate owned is valued at the time of foreclosure at fair value, less estimated cost to sell, thereby establishing a new cost basis. The Company obtains appraisals based on recent comparable sales to assist management in estimating the fair value of real estate owned. Subsequent to acquisition, real estate owned is valued at the lower of cost or fair value, less estimated cost to sell. Declines in value are charged to expense through a direct writedown of the asset. Costs related to holding real estate are charged to expense while costs related to development and improvements are capitalized.
	Gains from the sale of real estate owned, if any, are recognized when title has passed, minimum down payment requirements are met, the terms of any notes received are such as to satisfy continuing investment requirements, and the Company is relieved of any requirements for continued involvement with the properties. If the minimum down payment or the continuing investment is not adequate to meet the criteria specified in the Property, Plant and Equipment topic of the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC), the Company will defer income recognition and account for such sales using alternative methods, such as installment, deposit, or cost recovery.
Allowance for Loan Losses
	(i)Allowance for Loan Losses
	The Company maintains an allowance adequate to cover Management’s estimate of probable credit losses as of the balance sheet date.  The Company’s allowance for loan losses is maintained at a level considered adequate to provide for losses that can be estimated based upon specific and general conditions. All loan losses are charged, and all recoveries are credited, to the allowance for loan losses. Additions to the allowance for loan losses are provided by charges to income based on various factors, which, in the Company’s judgment, deserve current recognition in estimating probable losses. Charge-offs to the allowance are made when management determines that collectability of all or a portion of a loan is doubtful and available collateral is insufficient to repay the loan.
	General allowances are established for loan losses on a portfolio basis for loans that do not meet the definition of impaired, in accordance with the Receivables topic of the FASB ASC.  The portfolio is grouped into similar risk characteristics, primarily loan type and delinquency status. The Company applies an estimated loss rate to each loan group. The loss rates applied are based upon its loss experience adjusted, as appropriate, for environmental factors discussed below. This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions.  Actual loan losses may be significantly more than the allowance for loan losses the Company has established, which could have a material negative effect on its financial results.
	Residential mortgage loans represent the largest segment of the Company’s loan portfolio.  All of the residential mortgage loans are secured by a first mortgage on residential real estate in Hawaii and consist primarily of fixed-rate mortgage loans which have been underwritten to Freddie Mac and Fannie Mae guidelines and have similar risk characteristics.  The loan loss allowance is determined by first calculating the historical loss rate for this segment of the portfolio.  The loss rate may be adjusted for qualitative and environmental factors.  The allowance for loan loss is calculated by multiplying the adjusted loss rate by the total loans in this segment of the portfolio.
	The adjustments to historical loss experience are based on an evaluation of several qualitative and environmental factors, including:
	changes in lending policies and procedures, including changes in underwriting standards and collections, charge-off and recovery practices;
	changes in international, national, and local economic trends;
	changes in the types of loans in the loan portfolio;
	changes in the experience and ability of personnel in the mortgage loan origination and loan servicing departments;
	changes in the number and amount of delinquent loans and classified assets;
	changes in the type and volume of loans being originated;
	changes in the value of underlying collateral for collateral dependent loans;
	changes in any concentration of credit; and
	external factors such as competition, legal and regulatory requirements on the level of estimated credit losses in the existing loan portfolio.
	The Company also uses historical loss rates adjusted for qualitative and environmental factors to establish loan loss allowances for the following portfolio segments:
	home equity loans and lines of credit; and
	consumer and other loans.
	The Company has a limited loss experience for the construction, commercial and other mortgage segment of the loan portfolio.  The loan loss allowance on this portfolio segment is determined using the loan loss rate of other financial institutions in the State of Hawaii.  The allowance for loan loss is calculated by multiplying the loan loss rate of other financial institutions in the state by the total loans in this segment of the Company’s loan portfolio.
	In addition, the unallocated allowance is established to provide for probable losses that have been incurred as of the reporting date but are not reflected in the allocated allowance.
	While the Company uses the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations.  In addition, as an integral part of their examination process, the Federal Reserve Bank will periodically review the allowance for loan losses.  The Federal Reserve Bank may require the Company to increase the allowance based on their analysis of information available at the time of their examination.
Transfer of Financial Assets
	(j)Transfer of Financial Assets
	Transfers of financial assets are accounted for as sales when control is surrendered. Control is surrendered when the assets have been isolated from the Company, the transferee obtains the right to pledge or exchange the assets without constraint, and the Company does not maintain effective control over the transferred assets. Mortgage loans sold for cash are accounted for as sales as the above criteria have been met.
	Mortgage loans may also be packaged into securities that are issued and guaranteed by U.S. government-sponsored enterprises. The Company receives 100% of the mortgage-backed securities issued. Securitizations are not accounted for as sales and no gain or loss is recognized. The mortgage-backed securities received in securitizations are valued at amortized cost and classified as held-to-maturity.
	Mortgage loan transfers accounted for as sales and securitizations are without recourse, except for normal representations and warranties provided in sales transactions, and the Company may retain the related rights to service the loans.  The retained servicing rights create mortgage servicing assets that are accounted for in accordance with the Transfers and Servicing topic of the FASB ASC.  Mortgage servicing assets are initially valued at fair value and subsequently at the lower of cost or fair value and are amortized in proportion to and over the period of estimated net servicing income.   The Company uses a discounted cash flow model to determine the fair value of retained mortgage servicing rights. Prior to 2010, we retained the servicing rights on residential mortgage loans sold.  In 2010, we began selling loans primarily on a servicing-released basis.
Premises and Equipment
	(k)Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is principally computed on the straight-line method over the estimated useful lives of the respective assets. The estimated useful life of buildings and improvements is 30 years, furniture, fixtures, and equipment is 3 to 10 years, and automobiles are 3 years. Leasehold improvements are amortized on a straight-line basis over the shorter of the lease term or estimated useful life of the asset.
Income Taxes
	(l)Income Taxes
	The Company files consolidated federal income tax and consolidated state franchise tax returns.
	Deferred tax assets and liabilities are recognized using the asset and liability method of accounting for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and net operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the 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 tax rates is recognized in income in the period that includes the enactment date.
	We establish income tax contingency reserves for potential tax liabilities related to uncertain tax positions.  A liability for income tax uncertainties would be recorded for unrecognized tax benefits related to uncertain tax positions where it is more likely than not that the position will be sustained upon examination by a taxing authority.
	As of December 31, 2014 and 2013, the Company had not recognized a liability for income tax uncertainties in the accompanying consolidated balance sheets. Management concluded that a liability for income tax uncertainties is not expected to be recorded within the next 12 months.
	Tax years 2012 to 2013 currently remain subject to examination by the Internal Revenue Service. Tax years 2011 to 2013 currently remain subject to examination by the Department of Taxation of the State of Hawaii.
Impairment of Long-Lived Assets
	(m)Impairment of Long-Lived Assets
	Long-lived assets, such as premises and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the consolidated balance sheets and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated.
Pension Plan
	(n)Pension Plan
	Pension benefit costs (returns) are charged (credited) to salaries and employee benefits expense, and the corresponding prepaid (accrued) pension cost is recorded in prepaid expenses and other assets or accounts payable and accrued expenses in the consolidated balance sheets. The Company’s policy is to fund pension costs in amounts that will not be less than the minimum funding requirements of the Employee Retirement Income Security Act of 1974 and will not exceed the maximum tax-deductible amounts. The Company generally funds at least the net periodic pension cost, subject to limits and targeted funded status as determined with the consulting actuary.
Employee Stock Ownership Plan (ESOP)
	(o)Employee Stock Ownership Plan (ESOP)
	The cost of shares issued to the ESOP, but not yet allocated to participants, is shown as a reduction of stockholders’ equity.  Compensation expense is based on the market price of shares as they are committed to be released to participant accounts.  Dividends on allocated ESOP shares reduce retained earnings; dividends on unearned ESOP shares reduce debt and accrued interest.
Earnings Per Share
	(p)Earnings Per Share
	Basic earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period.  Diluted earnings per share is computed by dividing net income by the sum of the weighted-average number of shares outstanding plus the dilutive effect of stock options and restricted stock.  ESOP shares not committed to be released are not considered outstanding.
Common Stock Repurchase Program
	(q)Common Stock Repurchase Program
	In 2014, 2013, 2011 and 2010, the Company adopted common stock repurchase programs in which shares repurchased reduce the amount of shares issued and outstanding.  The repurchased shares may be reissued in connection with share-based compensation plans and for general corporate purposes.  As of December 31, 2014 and 2013, the Company had accumulated repurchases of 2,749,789 and 2,528,259 shares, respectively, of the total 3,099,253 and 2,699,253 shares authorized by the Board of Directors, respectively.  During 2014 and 2013, shares were repurchased at an average cost of $22.48 and $22.58, respectively.
Bank-Owned Life Insurance
	(r)Bank-Owned Life Insurance
	The Company’s investment in bank-owned life insurance is based on cash surrender value.  The Company invests in bank-owned life insurance to provide a funding source for benefit plan obligations. Bank-owned life insurance also generally provides noninterest income that is nontaxable. Federal regulations generally limit the investment in bank-owned life insurance to 25% of the Company’s Tier 1 capital plus the allowance for loan losses.  At December 31, 2014, this limit was $51.4 million and the Company had invested $41.3 million in bank-owned life insurance at that date.
Use of Estimates
	(s)Use of Estimates
	The preparation of the consolidated financial statements requires management to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amount of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include the allowance for loan losses; valuation of certain investment securities and determination as to whether declines in fair value below amortized cost are other than temporary; valuation allowances for deferred income tax assets; mortgage servicing assets; and assets and obligations related to employee benefit plans.  Accordingly, actual results could differ from those estimates.
Recently Issued Accounting Pronouncements
	(t)Recently Issued Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board (FASB) amended the Receivables topic of the FASB Accounting Standards Codification (ASC).  The amendment clarifies when an in substance repossession or foreclosure occurs and when a mortgage loan should be derecognized and the related real property recognized.  The amendment also requires disclosures about the amount of foreclosed residential real property held and the recorded investment in mortgage loans collateralized by residential real property in the process of foreclosure.  The amendment is effective for interim and annual periods beginning after December 15, 2014, with early adoption allowed.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
	In May 2014, the FASB amended the Revenue Recognition topic of the FASB ASC.  The amendment seeks to clarify the principles for recognizing revenue as well as to develop common revenue standards for U.S. generally accepted accounting principles and International Financial Reporting Standards.  The amendment is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period.  Early application is not permitted.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
	In June 2014, the FASB amended the Transfers and Servicing topic of the FASB ASC.  The amendment modifies the accounting for certain types of repurchase transactions as well as adds new disclosure requirements for repurchase transactions.  The amendment is effective for interim and annual periods beginning after December 15, 2014, with early adoption prohibited.  The Company does not expect the adoption of this amendment to have a material effect on its consolidated financial statements.
	In August 2014, the FASB amended the Receivables topic of the FASB ASC.  The amendment seeks to clarify the classification of foreclosed mortgage loans that are either fully or partially guaranteed under government programs, such as from the Federal Housing Administration (FHA) or the U.S. Department of Veterans Affairs (VA).  The amendment is effective for interim and annual periods beginning after December 15, 2014.  The Company does not expect the adoption of this amendment to have any effect on its consolidated financial statements.

Cash_and_Cash_Equivalents_Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2014
Cash and Cash Equivalents
Schedule of balances cash and cash equivalents		December 31,
	(Dollars in thousands)	2014		2013
	Cash and due from banks	$	10,803	$	9,962
	Interest-earning deposits in other banks	64,257		65,403
	Cash and cash equivalents	$	75,060	$	75,365

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investment Securities
Schedule of amortized cost and fair values of investment securities
		Carrying			Gross Unrealized				Estimated
	(Dollars in thousands)	Value			Gains		Losses		Fair Value
	December 31, 2014:
	Held to maturity:
	U.S. government-sponsored mortgage-backed securities	$	572,232		18,078		(4,290	)	$	586,020
	Trust preferred securities	690			—		—		690
	Total	$	572,922		18,078		(4,290	)	$	586,710
	December 31, 2013:
	Held to maturity:
	U.S. government-sponsored mortgage-backed securities	$	612,899		7,979		(23,408	)	$	597,470
	Trust preferred securities	537			—		—		537
	Total	$	613,436		7,979		(23,408	)	$	598,007
Schedule of carrying and estimated fair value of investment securities by contractual maturity
		Carrying			Estimated
	(Dollars in thousands)	Value			Fair Value
	Held to maturity:
	Due within 5 years	$	50		$	54
	Due after 5 years through 10 years	10			11
	Due after 10 years	572,862			586,645
	Total	$	572,922		$	586,710
Schedule of realized gains and losses and proceeds from sales of securities available for sale, held to maturity and trading
	(Dollars in thousands)	2014			2013			2012
	Proceeds from sales	$	19,319		$	51,102		$	17,206
	Gross gains	1,263			3,450			1,234
	Gross losses	—			—			—
Summary of investment securities which were in unrealized loss position
		Less Than 12 Months						12 Months or Longer						Total
					Unrealized						Unrealized			Number of			Unrealized
	Description of securities	Fair Value			Losses			Fair Value			Losses			Securities	Fair Value		Losses
	(Dollars in thousands)
	December 31, 2014:
	Mortgage-backed securities	$	12,717		$	65		$	183,349		$	4,225		37	$	196,066	$	4,290
	December 31, 2013:
	Mortgage-backed securities	$	361,445		$	21,678		$	22,010		$	1,730		69	$	383,455	$	23,408
Cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold
	(Dollars in thousands)	2014			2013
	Balance at January 1,	$	5,885		$	5,885
	Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	—			—
	Balance at December 31,	$	5,885		$	5,885
Comprehensive loss
Schedule of components of comprehensive loss, net of taxes
	(Dollars in thousands)	Unfunded			Noncredit			Unrealized			Total
		Pension			Related			Loss on
		Liability			Losses on			Securities
					Securities
					Not Expected
					to Be Sold
	December 31, 2014:
	Balances at beginning of period	$	3,338		$	376		$	73		$	3,787
	Other comprehensive income before reclassifications	1,694			(92		)	(1		)	1,601
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	1,694			(92		)	(1		)	1,601
	Balances at end of period	$	5,032		$	284		$	72		$	5,388
	December 31, 2013:
	Balances at beginning of period	$	3,792		$	445		$	96		$	4,333
	Other comprehensive income before reclassifications	(454		)	(69		)	(23		)	(546		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	(454		)	(69		)	(23		)	(546		)
	Balances at end of period	$	3,338		$	376		$	73		$	3,787
	December 31, 2012:
	Balances at beginning of period	$	2,966		$	679		$	125		$	3,770
	Other comprehensive income before reclassifications	826			(234		)	(29		)	563
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	826			(234		)	(29		)	563
	Balances at end of period	$	3,792		$	445		$	96		$	4,333
Noncredit Related Losses on Securities Not Expected to Be Sold
Comprehensive loss
Schedule of components of comprehensive loss, net of taxes
		December 31,
	(Dollars in thousands)	2014			2013
	Noncredit losses on other-than-temporarily impaired securities, net of taxes	$	283		$	376

Loans_Receivable_and_Allowance1

Loans Receivable and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Loans Receivable and Allowance for Loan Losses
Schedule of components of loans receivable
		December 31,
	(Dollars in thousands)	2014			2013
	Real estate loans:
	First mortgages:
	One- to four-family residential	$	926,074		$	823,273
	Multi-family residential	8,920			4,877
	Construction, commercial, and other	18,415			13,554
	Home equity loans and lines of credit	15,992			16,524
	Total real estate loans	969,401			858,228
	Other loans:
	Loans on deposit accounts	441			342
	Consumer and other loans	4,173			4,307
	Total other loans	4,614			4,649
	Less:
	Net unearned fees and discounts	(4,112		)	(4,849		)
	Allowance for loan losses	(1,691		)	(1,486		)
	Total unearned fees, discounts and allowance for loan losses	(5,803		)	(6,335		)
	Loans receivable, net	$	968,212		$	856,542
Schedule of activity in allowance for loan losses on loans receivable and by portfolio segment
	The activity in the allowance for loan losses on loans receivable is as follows:
		For the year ended December 31,
	(Dollars in thousands)	2014			2013			2012
	Balance, beginning of year	$	1,486		$	1,672		$	1,541
	Provision for loan losses	360			39			415
		1,846			1,711			1,956
	Charge-offs	(185		)	(495		)	(392		)
	Recoveries	30			270			108
	Net charge-offs	(155		)	(225		)	(284		)
	Balance, end of year	$	1,691		$	1,486		$	1,672
	The table below presents the activity in the allowance for loan losses by portfolio segment:
	(Dollars in thousands)	Residential			Construction,			Home			Consumer			Unallocated			Totals
		Mortgage			Commercial			Equity			and Other
					and Other			Loans and
					Mortgage			Lines of
					Loans			Credit
	2014:00:00
	Balance, beginning of year	$	376		$	799		$	10		$	229		$	72		$	1,486
	Provision (reversal of allowance) for loan losses	146			176			1			76			(39		)	360
		522			975			11			305			33			1,846
	Charge-offs	(118		)	—			(10		)	(57		)	—			(185		)
	Recoveries	9			2			4			15			—			30
	Net charge-offs	(109		)	2			(6		)	(42		)	—			(155		)
	Balance, end of year	$	413		$	977		$	5		$	263		$	33		$	1,691
	2013:00:00
	Balance, beginning of year	$	590		$	818		$	35		$	107		$	122		$	1,672
	Provision (reversal of allowance) for loan losses	(150		)	(31		)	18			252			(50		)	39
		440			787			53			359			72			1,711
	Charge-offs	(299		)	—			(50		)	(146		)	—			(495		)
	Recoveries	235			12			7			16			—			270
	Net charge-offs	(64		)	12			(43		)	(130		)	—			(225		)
	Balance, end of year	$	376		$	799		$	10		$	229		$	72		$	1,486
Schedule of balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
	(Dollars in thousands)	Residential			Construction			Home			Consumer			Unallocated			Totals
		Mortgage			Commercial			Equity			and Other
					and Other			Loans and
					Mortgage			Lines of
					Loans			Credit
	December 31, 2014:
	Allowance for loan losses:
	Ending allowance balance:
	Individually evaluated for impairment	$	—		$	—		$	—		$	—		$	—		$	—
	Collectively evaluated for impairment	413			977			5			263			33			1,691
	Total ending allowance balance	$	413		$	977		$	5		$	263		$	33		$	1,691
	Loans:
	Ending loan balance:
	Individually evaluated for impairment	$	6,158		$	—		$	296		$	4		$	—		$	6,458
	Collectively evaluated for impairment	924,732			18,399			15,702			4,612			—			963,445
	Total ending loan balance	$	930,890		$	18,399		$	15,998		$	4,616		$	—		$	969,903
	December 31, 2013:
	Allowance for loan losses:
	Ending allowance balance:
	Individually evaluated for impairment	$	—		$	—		$	—		$	—		$	—		$	—
	Collectively evaluated for impairment	376			799			10			229			72			1,486
	Total ending allowance balance	$	376		$	799		$	10		$	229		$	72		$	1,486
	Loans:
	Ending loan balance:
	Individually evaluated for impairment	$	8,373		$	—		$	160		$	—		$	—		$	8,533
	Collectively evaluated for impairment	814,960			13,514			16,372			4,649			—			849,495
	Total ending loan balance	$	823,333		$	13,514		$	16,532		$	4,649		$	—		$	858,028
Schedule of balance of impaired loans and related amount of allocated loan loss allowances
	(Dollars in thousands)	2014			2013
	Loans with no allocated allowance for loan losses	$	6,458		$	8,533
	Loans with allocated allowance for loan losses	—			—
	Total impaired loans	$	6,458		$	8,533
	Amount of allocated loan loss allowance	$	—		$	—
Schedule of balance of impaired loans individually evaluated for impairment by class of loans
	(Dollars in thousands)	Recorded			Unpaid
		Investment			Principal
					Balance
	December 31, 2014:
	With no related allowance recorded:
	One- to four-family residential mortgages	$	6,158		$	6,775
	Home equity loans and lines of credit	296			324
	Consumer and other	4			4
	Total	$	6,458		$	7,103
	December 31, 2013:
	With no related allowance recorded:
	One- to four-family residential mortgages	$	8,373		$	8,716
	Home equity loans and lines of credit	160			165
	Total	$	8,533		$	8,881
	December 31, 2012:
	With no related allowance recorded:
	One- to four-family residential mortgages	$	6,775		$	7,175
	Home equity loans and lines of credit	160			165
	Total	$	6,935		$	7,340
Schedule of average recorded investment and interest income recognized on impaired loans by class of loans
	(Dollars in thousands)	Average			Interest Income
		Recorded			Recognized
		Investment
	2014:00:00
	With no related allowance recorded:
	One- to four-family residential mortgages	$	6,383		$	118
	Home equity loans and lines of credit	309			—
	Consumer and other	4			—
	Total	$	6,696		$	118
	2013:00:00
	With no related allowance recorded:
	One- to four-family residential mortgages	$	8,451		$	130
	Home equity loans and lines of credit	160			—
	Total	$	8,611		$	130
	2012:00:00
	With no related allowance recorded:
	One- to four-family residential mortgages	$	6,924		$	210
	Home equity loans and lines of credit	159			6
	Total	$	7,083		$	216
Schedule of aging of loans and accrual status by class of loans
	(Dollars in thousands)	30 — 59			60 — 89			90 Days or			Total Past			Loans Not			Total			Nonaccrual		Loans
		Days Past			Days Past			Greater			Due			Past Due			Loans			Loans		More Than
		Due			Due			Past Due														90 Days
																						Past Due
																						and Still
																						Accruing
	December 31, 2014:
	One- to four-family residential mortgages	$	1,040		$	736		$	593		$	2,369		$	919,624		$	921,993		$	4,153	$	—
	Multi-family residential mortgages	—			—			—			—			8,897			8,897			—		—
	Construction, commercial and other mortgages	—			—			—			—			18,399			18,399			—		—
	Home equity loans and lines of credit	—			—			161			161			15,837			15,998			296		—
	Loans on deposit accounts	—			—			—			—			440			440			—		—
	Consumer and other	7			1			4			12			4,164			4,176			4		—
	Total	$	1,047		$	737		$	758		$	2,542		$	967,361		$	969,903		$	4,453	$	—
	December 31, 2013:
	One- to four-family residential mortgages	$	376		$	612		$	1,577		$	2,565		$	815,917		$	818,482		$	5,840	$	—
	Multi-family residential mortgages	—			—			—			—			4,851			4,851			—		—
	Construction, commercial and other mortgages	—			—			—			—			13,514			13,514			—		—
	Home equity loans and lines of credit	—			—			—			—			16,532			16,532			160		—
	Loans on deposit accounts	—			—			—			—			342			342			—		—
	Consumer and other	11			4			—			15			4,292			4,307			—		—
	Total	$	387		$	616		$	1,577		$	2,580		$	855,448		$	858,028		$	6,000	$	—
Schedule of new troubled debt restructurings by class of loans
		2014								2013
	(Dollars in thousands)	Number of		Pre-			Post-			Number of		Pre-			Post-
		Loans		Modification			Modification			Loans		Modification			Modification
				Recorded			Recorded					Recorded			Recorded
				Investment			Investment					Investment			Investment
	December 31:
	One- to four-family residential	—		$	—		$	—		2		$	1,043		$	1,043

Accrued_Interest_Receivable_Ta

Accrued Interest Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Interest Receivable
Schedule of components of accrued interest receivable		December 31,
	(Dollars in thousands)	2014		2013
	Investment securities	$	1,562	$	1,707
	Loans receivable	2,872		2,601
	Interest-bearing deposits	2		2
	Total	$	4,436	$	4,310

Mortgage_Servicing_Assets_Tabl

Mortgage Servicing Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Mortgage Servicing Assets
Schedule of changes in mortgage servicing assets
	(Dollars in thousands)	2014			2013
	Balance at beginning of year	$	580		$	646
	Additions	20			36
	Impairments	(15		)	—
	Amortization	(80		)	(102		)
	Balance at end of year	$	505		$	580
Schedule of gross carrying values, accumulated amortization, and net carrying values of mortgage servicing assets
		December 31,
	(Dollars in thousands)	2014			2013
	Gross carrying value	$	1,358		$	1,353
	Accumulated amortization	(853		)	(773		)
	Net carrying value	$	505		$	580
Schedule of estimated amortization expense for mortgage servicing assets
	(Dollars in thousands)
	2015	$	85
	2016	65
	2017	54
	2018	45
	2019	36
	Thereafter	220
	Total	$	505
Schedule of fair values and key assumptions used in determining fair values of mortgage servicing assets
		2014			2013
	Fair value, beginning of year (in thousands)	$	617		$	651
	Fair value, end of year (in thousands)	505			617
	Weighted average discount rate	10.50		%	10.50		%
	Weighted average prepayment speed assumption (PSA prepayment speed)	178.9			146.0
	Annual cost to service (per loan)	$	55		$	55

Interest_Rate_Lock_and_Forward1

Interest Rate Lock and Forward Loan Sale Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Interest Rate Lock and Forward Loan Sale Commitments
Schedule of location of assets and liabilities related to derivatives
			Asset Derivatives					Liability Derivatives
		Location on	Fair Value at December 31,					Fair Value at December 31,
	(Dollars in thousands)	Balance Sheet	2014		2013			2014		2013
	Interest rate contracts	Prepaid expenses and other assets	$	62	$	25		$	—	$	—
	Interest rate contracts	Accounts payable and accrued expenses	—		—			54		28
	Total derivatives		$	62	$	25		$	54	$	28
Schedule of location of gains and losses related to derivatives
		Location of
		Loss on
	(Dollars in thousands)	Statement of Income	2014		2013
	Interest rate contracts	Gain on sale of loans	$	11	$	(16	)

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Premises and Equipment
Schedule of premises and equipment
		December 31,
	(Dollars in thousands)	2014			2013
	Land	$	585		$	585
	Buildings and improvements	1,008			597
	Leasehold improvements	12,765			11,596
	Furniture, fixtures and equipment	5,612			5,323
	Automobiles	115			113
		20,085			18,214
	Less accumulated depreciation and amortization	(14,474		)	(13,218		)
		5,611			4,996
	Construction in progress	18			1,060
	Total	$	5,629		$	6,056

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits
Summary of deposit accounts by type with their respective weighted-average interest rates
		December 31,
		2014				2013
	(Dollars in thousands)	Amount		Rate		Amount			Rate
	Non-interest bearing	$	40,040	—	%	$	33,032		—	%
	Savings accounts	946,060		0.36		905,469			0.35
	Certificates of deposit	221,737		0.48		209,998			0.55
	Money market	749		0.20		807			0.20
	Checking and Super NOW	151,093		0.02		139,403			0.02
	Total	$	1,359,679	0.33	%	$	1,288,709		0.34	%
Schedule of maturity of certificate of deposit accounts
	The maturity of certificate of deposit accounts at December 31, 2014 is as follows (dollars in thousands):
	Maturing in:
	2015	$	178,036
	2016	11,707
	2017	8,230
	2018	4,407
	2019	19,357
	Total	$	221,737
Schedule of interest expense by type of deposit
	(Dollars in thousands)	2014		2013			2012
	Savings	$	3,369	$	3,035		$	4,294
	Certificates of deposit and money market	1,075		1,232			1,606
	Checking and Super NOW	30		29			36
	Total	$	4,474	$	4,296		$	5,936

Advances_from_the_Federal_Home1

Advances from the Federal Home Loan Bank (Tables)	12 Months Ended
	Dec. 31, 2014
Advances from the Federal Home Loan Bank
Schedule of advances outstanding		December 31,
		2014				2013				2012
				Weighted				Weighted				Weighted
				Average				Average				Average
	(Dollars in thousands)	Amount		Rate		Amount		Rate		Amount		Rate
	Due within one year	$	10,000	2.06	%	$	—	—	%	$	10,000	2.12	%
	Due over 1 year to 2 years	—		—		10,000		2.06		—		—
	Due over 2 years to 3 years	—		—		—		—		10,000		2.06
	Due over 3 years to 4 years	5,000		1.20		—		—		—		—
	Due over 4 years to 5 years	—		—		5,000		1.20		—		—
	Total	$	15,000	1.77	%	$	15,000	1.77	%	$	20,000	2.09	%

Securities_Sold_Under_Agreemen1

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2014
Securities Sold Under Agreements to Repurchase
Summary of securities sold under agreements to repurchase		December 31,
		2014				2013
				Weighted					Weighted
		Repurchase		Average		Repurchase			Average
	(Dollars in thousands)	Liability		Rate		Liability			Rate
	Maturing:
	1 year or less	$	47,000	2.11	%	$	—		—	%
	Over 1 year to 2 years	—		—		47,000			2.11
	Over 2 years to 3 years	25,000		1.46		—			—
	Over 3 years to 4 years	—		—		25,000			1.46
	Total	$	72,000	1.88	%	$	72,000		1.88	%
Summary comparing carrying value and fair value of securities pledged to secure repurchase agreements, repurchase liability, and amount at risk												Weighted
		Carrying		Fair								Average
		Value of		Value of			Repurchase			Amount		Months to
	(Dollars in thousands)	Securities		Securities			Liability			at Risk		Maturity
	Maturing:
	Over 90 days	$	75,251	$	76,600		$	72,000		$	4,600	13

Offsetting_of_Financial_Liabil1

Offsetting of Financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Offsetting of Financial Liabilities
Schedule of securities sold under agreements to repurchase subject to conditional right of offset
		Gross Amount		Gross Amount		Net Amount of		Gross Amount Not Offset in the
						Liabilities		Balance Sheet
	(Dollars in thousands)	of Recognized		Offset in the		Presented in the		Financial		Cash Collateral		Net Amount
		Liabilities		Balance Sheet		Balance Sheet		Instruments		Pledged
	December 31, 2014:
	Securities sold under agreements to repurchase	$	72,000	$	—	$	72,000	$	72,000	$	—	$	—
	December 31, 2013:
	Securities sold under agreements to repurchase	$	72,000	$	—	$	72,000	$	72,000	$	—	$	—

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Taxes
Schedule of allocation of federal and state income taxes between current and deferred provisions
	(Dollars in thousands)	2014			2013			2012
	Current
	Federal	$	8,047		$	8,746		$	7,221
	State	1,984			1,956			1,668
		10,031			10,702			8,889
	Deferred
	Federal	(730		)	(1,531		)	(500		)
	State	(392		)	(325		)	(92		)
		(1,122		)	(1,856		)	(592		)
	Total	$	8,909		$	8,846		$	8,297
Schedule of reconciliation of tax provision based on statutory corporate rate on pretax income and provision for taxes
	(Dollars in thousands)	2014			2013			2012
	Income tax expense at statutory rate	$	8,052		$	8,223		$	8,097
	Income tax effect of:
	Other tax-exempt income	(371		)	(373		)	(330		)
	Share-based compensation	83			(188		)	(307		)
	State income taxes, net of federal income tax benefits	1,035			1,060			1,024
	Other	110			124			(187		)
	Total income tax expense	$	8,909		$	8,846		$	8,297
	Effective income tax rate	38.72		%	37.65		%	35.86		%
Schedule of components of income taxes payable (receivable)
		December 31,
	(Dollars in thousands)	2014			2013
	Current taxes payable (receivable):
	Federal	$	(875	)	$	(546	)
	State	1,701			1,960
		826			1,414
	Deferred taxes receivable:
	Federal	(5,610		)	(4,018		)
	State	(1,644		)	(1,057		)
		(7,254		)	(5,075		)
	Total	$	(6,428	)	$	(3,661	)
Schedule of tax effects of temporary differences that give rise to significant portions of deferred tax assets and deferred tax liabilities
		December 31,
	(Dollars in thousands)	2014			2013
	Deferred tax assets:
	Premises and equipment	$	1,521		$	1,309
	Hawaii franchise tax	678			782
	Unfunded pension liability	2,099			1,381
	Allowance for loan losses	669			591
	Impaired asset write-down	2,503			2,580
	Employee benefit plans	2,750			1,880
	Equity incentive plan	1,475			1,286
	Unrealized loss on available-for-sale securities	48			49
	Deferred compensation	729			166
	Other	24			10
		12,496			10,034
	Deferred tax liabilities:
	Net deferred loan fees	2,619			2,155
	FHLB stock dividends	2,301			2,453
	Prepaid expense	122			121
	Premiums on loans sold	200			230
	Deferred compensation	—			—
		5,242			4,959
	Net deferred tax assets	$	7,254		$	5,075

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Employee Benefit Plans
Schedule of status of Pension Plan and SERP
		Pension Plan						SERP
		December 31,
	(Dollars in thousands)	2014			2013			2014			2013
	Accumulated benefit obligation at end of year	$	17,687		$	14,966		$	8,754		$	8,595
	Change in projected benefit obligation:
	Benefit obligation at beginning of year	$	14,966		$	14,644		$	8,595		$	8,408
	Service cost	92			108			59			95
	Interest cost	727			611			117			109
	Actuarial loss (gain)	2,353			(59		)	—			—
	Benefits paid	(451		)	(338		)	(17		)	(17		)
	Benefit obligation at end of year	17,687			14,966			8,754			8,595
	Change in plan assets:
	Fair value of plan assets at beginning of year	12,723			11,659			—			—
	Actual return on plan assets	334			1,402			—			—
	Employer contributions	1,000			—			17			17
	Benefits paid	(451		)	(338		)	(17		)	(17		)
	Fair value of plan assets at end of year	13,606			12,723			—			—
	Funded status at end of year	$	(4,081	)	$	(2,243	)	$	(8,754	)	$	(8,595	)
	Amounts recognized in the consolidated balance sheets:
	Accounts payable and accrued expenses - liability	$	(4,081	)	$	(2,243	)	$	(8,754	)	$	(8,595	)
	Amounts recognized in accumulated other comprehensive loss:
	Net actuarial loss	$	8,355		$	5,542		$	—		$	—
	Prior service cost	—			—			—			—
	Accumulated other comprehensive loss, before tax	$	8,355		$	5,542		$	—		$	—
Schedule of changes recognized in accumulated other comprehensive loss
		Pension Plan
		Year Ended December 31,
	(Dollars in thousands)	2014			2013
	Accumulated other comprehensive loss at beginning of year, before tax	$	5,542		$	6,295
	Actuarial net loss (gain) arising during the period	2,943			(590		)
	Amortizations (recognized in net periodic benefit cost):
	Actuarial loss	(130		)	(163		)
	Prior service cost	—			—
	Total recognized in other comprehensive loss	2,813			(753		)
	Accumulated other comprehensive loss at end of year, before tax	$	8,355		$	5,542
Schedule of weighted average assumptions used to determine benefit obligations
		Pension Plan				SERP
		Year Ended December 31,
		2014		2013		2014		2013
	Assumptions used to determine the year-end benefit obligations:
	Discount rate	4.10	%	4.90	%	5.06	%	5.02	%
	Rate of compensation increase	N/A		N/A		5.00	%	5.00	%
Schedule of Pension Plan's assets measured at fair value
					Fair Value of Measurements at Report Date
					Using:
	(Dollars in thousands)	December 31,			Quoted Prices			Significant			Significant
		2014			in Active			Other			Unobservable
					Markets for			Observable			Inputs
					Identical			Inputs			(Level 3)
					Assets			(Level 2)
					(Level 1)
	December 31, 2014:
	Cash	$	1,041		$	1,041		$	—		$	—
	Money market funds	1,274			1,274			—			—
	Equities	7,720			7,720			—			—
	Mutual funds (a)	3,571			3,571			—			—
	Total	$	13,606		$	13,606		$	—		$	—
	December 31, 2013:
	Cash	$	225		$	225		$	—		$	—
	Money market funds	609			609			—			—
	Equities	1,400			1,400			—			—
	Mutual funds (a)	10,489			10,489			—			—
	Total	$	12,723		$	12,723		$	—		$	—
	(a) This category includes mutual funds that invest in equities and bonds.  The mutual fund managers have the ability to change the amounts invested in equities and bonds depending on their investment outlook.
Schedule of estimated future benefit payments reflecting expected future service
		Pension
	(Dollars in thousands)	Plan			SERP
	2015	$	721		$	6,516
	2016	745			17
	2017	762			17
	2018	798			53
	2019	858			161
	2020 — 2024	4,916			3,220
	Total	$	8,800		$	9,984
Schedule of weighted average assumptions used to determine net periodic benefit cost
		Pension Plan						SERP
		Year Ended December 31,
	(Dollars in thousands)	2014		2013		2012		2014		2013		2012
	Assumptions used to determine the net periodic benefit cost:
	Discount rate	4.90	%	4.20	%	4.90	%	5.06	%	5.06	%	5.05	%
	Expected return on plan assets	7.50		7.75		7.75		—		—		—
	Rate of compensation increase	N/A		N/A		N/A		5.00		5.00		5.00
Schedule of components of net periodic benefit cost
		Pension Plan									SERP
		Year Ended December 31,
	(Dollars in thousands)	2014			2013			2012			2014			2013		2012
	Net periodic benefit cost for the year:
	Service cost	$	92		$	108		$	117		$	59		$	95	$	158
	Interest cost	727			611			625			117			109		98
	Expected return on plan assets	(924		)	(870		)	(845		)	—			—		—
	Amortization of prior service cost	—			—			—			—			—		—
	Recognized actuarial loss	130			163			117			—			—		—
	Recognized curtailment loss	—			—			—			—			—		—
	Net periodic benefit cost	$	25		$	12		$	14		$	176		$	204	$	256

Employee_Stock_Ownership_Plan_

Employee Stock Ownership Plan (Tables)	12 Months Ended
	Dec. 31, 2014
Employee Stock Ownership Plan
Schedule of shares held by ESOP trust		December 31,
		2014		2013
	Allocated shares	283,381		239,241
	Unearned shares	685,057		733,989
	Total ESOP shares	968,438		973,230
	Fair value of unearned shares, in thousands	$	14,763	$	17,029

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-Based Compensation
Schedule of compensation expense and related tax benefit for all share-based awards
	(In thousands)	2014			2013			2012
	Compensation expense	$	2,676		$	2,676		$	2,690
	Income tax benefit	1,074			1,291			1,432
Schedule of stock option activity
		Options		Weighted			Remaining		Aggregate
				Average			Contractual		Intrinsic
				Exercise			Life (years)		Value
				Price					(in thousands)
	Options outstanding at December 31, 2011	871,144		$	17.36		8.67		$	2,082
	Granted	3,085		23.62			9.67		—
	Exercised	41,275		17.36			—		171
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2012	832,954		$	17.38		7.67		$	4,554
	Granted	—		—			—		—
	Exercised	—		—			—		—
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2013	832,954		$	17.38		6.68		$	4,845
	Granted	—		—			—		—
	Exercised	—		—			—		—
	Forfeited	—		—			—		—
	Expired	—		—			—		—
	Options outstanding at December 31, 2014	832,954		$	17.38		5.68		$	3,471
	Options vested and exercisable at December 31, 2014	555,097		$	17.38		5.68		$	2,314
Summary of certain stock option activity
	(In thousands)	2014			2013			2012
	Intrinsic value of stock options exercised	$	—		$	—		$	171
	Cash received from stock options exercised	—			—			717
	Tax benefits realized from stock options exercised	—			—			69
	Total fair value of stock options that vested	2,852			3,223			3,175
Schedule of restricted stock award activity
		Restricted		Weighted
		Stock Awards		Average Grant
				Date Fair
				Value
	Nonvested at December 31, 2011	563,994		$	17.36
	Granted	2,735		23.62
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2012	453,397		$	17.39
	Granted	—		—
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2013	340,065		$	17.39
	Granted	—		—
	Vested	113,332		17.39
	Forfeited	—		—
	Nonvested at December 31, 2014	226,733		$	17.39

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share
Schedule of information used to compute basic and diluted earnings per share
		For the Year Ended December 31,
	(Dollars in thousands, except per share data)	2014		2013		2012
	Net income	$	14,097	$	14,647	$	14,838
	Weighted-average number of shares used in:
	Basic earnings per share	9,211,409		9,711,233		10,113,453
	Dilutive common stock equivalents:
	Stock options and restricted stock units	105,914		133,709		99,737
	Diluted earnings per share	9,317,323		9,844,942		10,213,190
	Net income per common share, basic	$	1.53	$	1.51	$	1.47
	Net income per common share, diluted	$	1.51	$	1.49	$	1.45

Other_Comprehensive_Loss_Table

Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2014
Other Comprehensive Loss
Schedule of changes in components of accumulated other comprehensive loss, net of taxes
	(Dollars in thousands)	Unfunded			Noncredit			Unrealized			Total
		Pension			Related			Loss on
		Liability			Losses on			Securities
					Securities
					Not Expected
					to Be Sold
	December 31, 2014:
	Balances at beginning of period	$	3,338		$	376		$	73		$	3,787
	Other comprehensive income before reclassifications	1,694			(92		)	(1		)	1,601
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	1,694			(92		)	(1		)	1,601
	Balances at end of period	$	5,032		$	284		$	72		$	5,388
	December 31, 2013:
	Balances at beginning of period	$	3,792		$	445		$	96		$	4,333
	Other comprehensive income before reclassifications	(454		)	(69		)	(23		)	(546		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	(454		)	(69		)	(23		)	(546		)
	Balances at end of period	$	3,338		$	376		$	73		$	3,787
	December 31, 2012:
	Balances at beginning of period	$	2,966		$	679		$	125		$	3,770
	Other comprehensive income before reclassifications	826			(234		)	(29		)	563
	Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
	Net current period other comprehensive income	826			(234		)	(29		)	563
	Balances at end of period	$	3,792		$	445		$	96		$	4,333
Schedule of tax effect on each component of other comprehensive loss
		Year Ended December 31,
		2014									2013								2012
	(Dollars in thousands)	Pretax			Tax			After Tax			Pretax			Tax		After Tax			Pretax			Tax			After Tax
		Amount						Amount			Amount					Amount			Amount						Amount
	Unfunded pension liability	$	2,813		$	(1,119	)	$	1,694		$	(753	)	$	299	$	(454	)	$	1,341		$	(515	)	$	826
	Noncredit related losses on securities not expected to be sold	(153		)	61			(92		)	(116		)	47		(69		)	(389		)	155			(234		)
	Unrealized loss on securities	(2		)	1			(1		)	(38		)	15		(23		)	(49		)	20			(29		)
	Total	$	2,658		$	(1,057	)	$	1,601		$	(907	)	$	361	$	(546	)	$	903		$	(340	)	$	563

Commitments_Tables

Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments
Schedule of future minimum rental commitments under all noncancelable operating leases	(Dollars in thousands)
	2015	$	2,641
	2016	2,458
	2017	2,211
	2018	1,547
	2019	1,109
	Thereafter	1,529
	Total	$	11,495
Schedule of future minimum rental income for noncancelable lease	(Dollars in thousands)
	2015	$	110
	2016	110
	2017	110
	2018	110
	2019	110
	Thereafter	220
	Total	$	770

Regulatory_Capital_and_Supervi1

Regulatory Capital and Supervision (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital and Supervision
Schedule of regulatory capital ratios
		Required					Actual				Excess over
	(Dollars in thousands)	Amount			Percentage		Amount		Percentage		requirement
	December 31, 2014:
	Core (Tier 1) capital	$	151,548		9.00	%	$	203,708	12.10	%	$	52,160
	Tangible capital	25,258			1.50		203,708		12.10		178,450
	Risk-based capital	54,902			8.00		205,403		29.93		150,501
	Tier 1 risk-based capital	27,451			4.00		203,708		29.68		176,257
	December 31, 2013:
	Core (Tier 1) capital	$	64,817		4.00	%	$	200,074	12.35	%	$	135,257
	Tangible capital	24,307			1.50		200,074		12.35		175,767
	Risk-based capital	50,407			8.00		201,566		31.99		151,159
	Tier 1 risk-based capital	25,204			4.00		200,074		31.75		174,870
Schedule of reconciliation of Bank equity to regulatory capital
		December 31,
	(Dollars in thousands)	2014			2013
	Bank equity	$	198,370		$	196,563
	Intangible assets	—			(251		)
	Disallowed servicing assets	(51		)	(25		)
	Accumulated other comprehensive loss	5,388			3,787
	Core and tangible capital	203,707			200,074
	Allowance for loan losses — general, including allowance for credit losses on off-balance sheet credit exposures	1,695			1,492
	Regulatory risk-based capital — computed	$	205,402		$	201,566

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value of Financial Instruments
Schedule of estimated fair values of financial instruments
			Carrying					Fair Value Measurements Using
	(Dollars in thousands)		Amount		Fair Value			Level 1		Level 2			Level 3
	December 31, 2014:
	Assets
	Cash and cash equivalents		$	75,060	$	75,060		$	75,060	$	—		$	—
	Investment securities held to maturity		572,922		586,710			—		586,020			690
	FHLB stock		11,234		11,234			—		11,234			—
	FRB stock		2,925		2,925			—		2,925			—
	Loans held for sale		1,048		1,079			—		1,079			—
	Loans receivable, net		968,212		998,183			—		—			998,183
	Accrued interest receivable		4,436		4,436			4,436		—			—
	Interest rate contracts		62		62			—		62			—
	Liabilities
	Deposits		1,359,679		1,360,074			1,137,942		—			222,132
	Advances from the Federal Home Loan Bank		15,000		14,977			—		—			14,977
	Securities sold under agreements to repurchase		72,000		72,334			—		—			72,334
	Accounts payable and accrued expenses (excluding interest rate contracts)		24,044		24,044			24,044		—			—
	Interest rate contracts		54		54			—		54			—
	Current income taxes payable		826		826			826		—			—
	Advance payments by borrowers for taxes and insurance		3,916		3,916			3,916		—			—
	December 31, 2013:
	Assets
	Cash and cash equivalents		$	75,365	$	75,365		$	75,365	$	—		$	—
	Investment securities held to maturity		613,436		598,007			—		597,470			537
	FHLB stock		11,689		11,689			—		11,689			—
	Loans held for sale		2,210		2,252			—		2,252			—
	Loans receivable, net		856,542		880,852			—		—			880,852
	Accrued interest receivable		4,310		4,310			4,310		—			—
	Interest rate contracts		25		25			—		25			—
	Liabilities
	Deposits		1,288,709		1,289,348			1,078,712		—			210,636
	Advances from the Federal Home Loan Bank		15,000		15,110			—		—			15,110
	Securities sold under agreements to repurchase		72,000		73,151			—		—			73,151
	Accounts payable and accrued expenses (excluding interest rate contracts)		23,905		23,905			23,905		—			—
	Interest rate contracts		28		28			—		28			—
	Current income taxes payable		1,414		1,414			1,414		—			—
	Advance payments by borrowers for taxes and insurance		3,708		3,708			3,708		—			—
Schedule of assets and liabilities measured at fair value on a recurring basis
	(Dollars in thousands)		Level 1		Level 2			Level 3		Total
	December 31, 2014:
	Interest rate contracts — assets		$	—	$	62		$	—	$	62
	Interest rate contracts — liabilities		—		(54		)	—		(54		)
	December 31, 2013:
	Interest rate contracts — assets		$	—	$	25		$	—	$	25
	Interest rate contracts — liabilities		—		(28		)	—		(28		)
Schedule of assets measured at fair value on nonrecurring basis and related gains and losses
	(Dollars in thousands)		Level 1		Level 2			Level 3		Total			Total Gains
													(Losses)
	December 31, 2014:
	Impaired loans		$	—	$	—		$	327	$	327		$	(4	)
	Trust preferred securities		—		—			690		690			153
	Mortgage servicing assets		—		—			505		505			(15		)
	December 31, 2013:
	Impaired loans		$	—	$	—		$	5,456	$	5,456		$	76
	Trust preferred securities		—		—			537		537			116
Schedule of significant unobservable inputs for Level 3 nonrecurring fair value measurements
	(Dollars in thousands)		Fair Value		Valuation Technique		Unobservable		Value
							Input
	December 31, 2014:
	Impaired loans — non-collateral dependent		$	327	Discounted cash flow		Discount rate (1)		6.10%
	Trust preferred securities		690		Discounted cash flow		Discount rate		Three-month LIBOR plus 20%
	Mortgage servicing assets		505		Discounted cash flow		Discount rate		10.50%
							Prepayment speed (PSA)		164.8 – 262.5
							Annual cost to service (per loan)		$55
	December 31, 2013:
	Impaired loans — non-collateral dependent		$	5,456	Discounted cash flow		Discount rate (1)		3.15% - 6.94%
	Trust preferred securities		537		Discounted cash flow		Discount rate		Three-month LIBOR plus 20%
		-1		Represents the yield on contractual cash flows prior to modification in troubled debt restructurings.

Parent_Company_Only_Tables

Parent Company Only (Tables) (Territorial Bancorp Inc.)	12 Months Ended
	Dec. 31, 2014
Territorial Bancorp Inc.
Consolidated financial statements
Condensed Balance Sheet
	Condensed Balance Sheet
		December 31,
	(Dollars in thousands)	2014			2013
	Assets
	Cash	$	16,155		$	13,079
	Investment in Territorial Savings Bank	198,370			196,563
	Receivable from Territorial Savings Bank	2,262			933
	Prepaid expenses and other assets	23			2,103
	Total assets	$	216,810		$	212,678
	Liabilities and Equity
	Other liabilities	$	432		$	538
	Equity	216,378			212,140
	Total liabilities and equity	$	216,810		$	212,678
Condensed Statement of Income
	Condensed Statement of Income
		For the Year Ended December 31,
	(Dollars in thousands)	2014			2013			2012
	Interest and dividend income:
	Dividends from Territorial Savings Bank	$	14,000		$	25,000		$	11,788
	Interest-earning deposit with Territorial Savings Bank	20			26			32
	Total interest and dividend income	14,020			25,026			11,820
	Noninterest expense:
	Salaries	37			37			37
	Other general and administrative expenses	837			728			763
	Total noninterest expense	874			765			800
	Income before income taxes and equity in undistributed earnings in subsidiaries	13,146			24,261			11,020
	Income taxes	(360		)	(299		)	(297		)
	Income before equity in undistributed earnings in subsidiaries	13,506			24,560			11,317
	Equity in undistributed earnings of Territorial Savings Bank, net of dividends	591			(9,913		)	3,521
	Net income	$	14,097		$	14,647		$	14,838
Condensed Statement of Cash Flows
	Condensed Statement of Cash Flows
		For the Year Ended December 31,
	(Dollars in thousands)	2014			2013			2012
	Cash flows from operating activities:
	Net income	$	14,097		$	14,647		$	14,838
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of Territorial Savings Bank, net of dividends	(591		)	9,913			(3,521		)
	ESOP expense	1,036			1,125			1,082
	Excess tax benefits from share-based compensation	—			—			(54		)
	Net decrease in prepaid expenses and other assets	751			2,325			172
	Net increase (decrease) in other liabilities	29			526			(136		)
	Net cash provided by operating activities	15,322			28,536			12,381
	Cash flows from investing activities:
	Investment in Territorial Savings Bank	—			—			—
	Net cash used in investing activities	—			—			—
	Cash flows from financing activities:
	Excess tax benefits from share-based compensation	—			—			54
	Proceeds from issuance of common stock, net of costs	—			—			717
	Repurchases of company stock	(5,612		)	(19,595		)	(8,025		)
	Cash dividends paid	(6,634		)	(6,231		)	(5,728		)
	Net cash used in financing activities	(12,246		)	(25,826		)	(12,982		)
	Net increase (decrease) in cash	3,076			2,710			(601		)
	Cash at beginning of the period	13,079			10,369			10,970
	Cash at end of the period	$	16,155		$	13,079		$	10,369

Unaudited_Quarterly_Financial_1

Unaudited Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Unaudited Quarterly Financial Information
Schedule of unaudited quarterly financial information		First		Second			Third		Fourth
		Quarter		Quarter			Quarter		Quarter			Full Year
		(Dollars in thousands, except per share data)
	2014:00:00
	Interest and dividend income	$	14,657	$	14,881		$	14,990	$	15,087		$	59,615
	Interest expense	1,500		1,512			1,551		1,555			6,118
	Net interest income	13,157		13,369			13,439		13,532			53,497
	Provision for loan losses	9		156			23		172			360
	Net interest income after provision for loan losses	13,148		13,213			13,416		13,360			53,137
	Noninterest income	1,358		1,279			1,398		1,142			5,177
	Noninterest expense	8,864		8,747			9,079		8,618			35,308
	Income before income taxes	5,642		5,745			5,735		5,884			23,006
	Income taxes	2,180		2,026			2,273		2,430			8,909
	Net income	3,462		3,719			3,462		3,454			14,097
	Basic earnings per share	0.38		0.41			0.38		0.37			1.53
	Diluted earnings per share	0.37		0.40			0.37		0.37			1.51
	Cash dividends declared per common share	0.14		0.15			0.15		0.26			0.70
		First		Second			Third		Fourth
		Quarter		Quarter			Quarter		Quarter			Full Year
		(Dollars in thousands, except per share data)
	2013:
	Interest and dividend income	$	13,882	$	13,783		$	14,091	$	14,419		$	56,175
	Interest expense	1,700		1,610			1,520		1,452			6,282
	Net interest income	12,182		12,173			12,571		12,967			49,893
	Provision (reversal of allowance) for loan losses	18		(16		)	45		(8		)	39
	Net interest income after provision for loan losses	12,164		12,189			12,526		12,975			49,854
	Noninterest income	2,360		2,311			2,323		1,722			8,716
	Noninterest expense	8,716		8,595			8,720		9,046			35,077
	Income before income taxes	5,808		5,905			6,129		5,651			23,493
	Income taxes	2,167		2,244			2,298		2,137			8,846
	Net income	3,641		3,661			3,831		3,514			14,647
	Basic earnings per share	0.37		0.37			0.4		0.37			1.51
	Diluted earnings per share	0.36		0.36			0.39		0.37			1.49
	Cash dividends declared per common share	0.12		0.13			0.13		0.24			0.62

Organization_Details

Organization (Details) (Plan of Conversion and Reorganization and Registration of Shares, USD $)	0 Months Ended
In Millions, except Share data, unless otherwise specified	Jul. 10, 2009	Dec. 31, 2014
Plan of conversion and reorganization
Liquidation account balance		$15.20
Stock offering
Plan of conversion and reorganization
Shares issued	12,233,125
Share price (in dollars per share)	$10
Gross proceeds	122.3
Conversion expenses offset against gross proceeds	$3.70

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014
	item
Description of Business
Number of branches through which loan and deposit products and services are provided to individual customers	28
Transfer of financial assets
Percentage of receipt on transfer of mortgage-backed securities issued	100.00%
Buildings and improvements
Premises and equipment
Estimated useful life	30 years
Furniture, fixtures and equipment | Minimum
Premises and equipment
Estimated useful life	3 years
Furniture, fixtures and equipment | Maximum
Premises and equipment
Estimated useful life	10 years
Automobiles
Premises and equipment
Estimated useful life	3 years

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Common Stock Repurchase Program
Total accumulated shares repurchased	2,749,789	2,528,259
Shares authorized under repurchase program	3,099,253	2,699,253
Average cost of shares repurchased (in dollars per share)	$22.48	$22.58
Bank-Owned Life Insurance
Percentage applied on Tier 1 capital plus allowance for loan losses to calculate ceiling limit of investment	25.00%
Amount of ceiling limit of investment	$51,400,000
Amount of investment in bank-owned life insurance	$41,303,000	$40,243,000

Cash_and_Cash_Equivalents_Deta

Cash and Cash Equivalents (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Cash and Cash Equivalents
Cash and due from banks	$10,803	$9,962
Interest-earning deposits in other banks	64,257	65,403
Cash and cash equivalents	$75,060	$75,365	$182,818	$131,937

Investment_Securities_Details

Investment Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Held to maturity:
Carrying Value	$572,922,000	$613,436,000
Gross Unrealized Gains	18,078,000	7,979,000
Gross Unrealized Losses	-4,290,000	-23,408,000
Estimated Fair Value	586,710,000	598,007,000
U.S. government-sponsored mortgage-backed securities
Held to maturity:
Carrying Value	572,232,000	612,899,000
Gross Unrealized Gains	18,078,000	7,979,000
Gross Unrealized Losses	-4,290,000	-23,408,000
Estimated Fair Value	586,020,000	597,470,000
Trust preferred securities
Held to maturity:
Carrying Value	690,000	537,000
Estimated Fair Value	$690,000	$537,000

Investment_Securities_Details_

Investment Securities (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Held to maturity, Carrying Value
Due within 5 years	$50
Due after 5 years through 10 years	10
Due after 10 years	572,862
Total	572,922	613,436
Held to maturity, Estimated Fair Value
Due within 5 years	54
Due after 5 years through 10 years	11
Due after 10 years	586,645
Estimated Fair Value	$586,710	$598,007

Investment_Securities_Details_1

Investment Securities (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Sale of held-to-maturity debt securities
Proceeds from the sale of held-to-maturity debt securities	$14,248,000	$51,102,000	$17,206,000
Carrying value of held-to-maturity debt securities sold	13,000,000	47,700,000	16,000,000
Pledged investment securities
Investment securities pledged to secure public deposit, securities sold under agreement to repurchase and transaction clearing accounts	270,200,000	273,200,000
Held-to-maturity debt securities
Realized gains and losses and the proceeds from sales of securities available for sale, held to maturity and trading
Gross gains	1,200,000	3,500,000	1,200,000
U.S. government-sponsored mortgage-backed securities
Realized gains and losses and the proceeds from sales of securities available for sale, held to maturity and trading
Proceeds from sales	19,319,000	51,102,000	17,206,000
Gross gains	$1,263,000	$3,450,000	$1,234,000

Investment_Securities_Details_2

Investment Securities (Details 4) (U.S. government-sponsored mortgage-backed securities, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	item	item
U.S. government-sponsored mortgage-backed securities
Investment Securities
Less Than 12 Months Fair Value	$12,717	$361,445
Less Than 12 Months Unrealized Losses	65	21,678
12 Months or Longer Fair Value	183,349	22,010
12 Months or Longer Unrealized Losses	4,225	1,730
Total Number of Securities	37	69
Total Fair Value	196,066	383,455
Total Unrealized Losses	$4,290	$23,408

Investment_Securities_Details_3

Investment Securities (Details 5) (USD $)	36 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Transaction
	security
Investment Securities
Book value	$572,922,000	$613,436,000
Trust preferred securities
Investment Securities
Number of securities owned	2
Number of market transactions of the security	5
Book value	690,000	537,000
Remaining amortized cost basis	1,100,000
Trust preferred securities | PreTSL XXIV
Investment Securities
Book value	0
Trust preferred securities | PreTSL XXIII
Investment Securities
Book value	690,000
Remaining amortized cost basis	$1,100,000

Investment_Securities_Details_4

Investment Securities (Details 6) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold
Beginning balance	$5,885	$5,885	$5,885
Ending balance	5,885	5,885	5,885
Components of comprehensive loss, net of taxes, resulting from other-than-temporarily impaired securities
Noncredit losses on other-than-temporarily impaired securities, net of taxes	$283	$376

Federal_Home_Loan_Bank_Stock_D

Federal Home Loan Bank Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Federal Home Loan Bank Stock
Requirement to hold shares of capital stock of FHLB as a percentage of mortgage loans and mortgage-backed securities	0.50%
Requirement to hold shares of capital stock of FHLB threshold amount	$500
Federal Home Loan Bank stock, at cost	$11,234,000	$11,689,000

Federal_Reserve_Bank_Stock_Det

Federal Reserve Bank Stock (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Investment in stock
Federal Reserve Bank Stock, at cost	2,925
Territorial Savings Bank
Investment in stock
Requirement to hold shares of capital stock of the Federal Reserve Bank as a percentage of capital and surplus (as a percent)	6.00%

Loans_Receivable_and_Allowance2

Loans Receivable and Allowance for Loan Losses (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Real estate loans:
Total real estate loans	$969,401	$858,228
Other loans:
Total other loans	4,614	4,649
Less: Net unearned fees and discounts	-4,112	-4,849
Less: Allowance for loan losses	-1,691	-1,486	-1,672	-1,541
Total unearned fees, discounts and allowance for loan losses	-5,803	-6,335
Loans receivable, net	968,212	856,542
One- to four-family residential
Real estate loans:
Total real estate loans	926,074	823,273
Multi-family residential
Real estate loans:
Total real estate loans	8,920	4,877
Construction, Commercial and Other Mortgage Loans
Real estate loans:
Total real estate loans	18,415	13,554
Other loans:
Less: Allowance for loan losses	-977	-799	-818
Home Equity Loans and Lines of Credit
Real estate loans:
Total real estate loans	15,992	16,524
Other loans:
Less: Allowance for loan losses	-5	-10	-35
Loans on deposit accounts
Other loans:
Total other loans	441	342
Consumer and other loans
Other loans:
Total other loans	$4,173	$4,307

Loans_Receivable_and_Allowance3

Loans Receivable and Allowance for Loan Losses (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
Activity in allowance for loan losses
Balance, beginning of year				$1,486				$1,672	$1,486	$1,672	$1,541
Provision (reversal of allowance) for loan losses	172	23	156	9	-8	45	-16	18	360	39	415
Allowance for loan losses on loans receivable after provision (reversal of allowance)									1,846	1,711	1,956
Charge-offs									-185	-495	-392
Recoveries									30	270	108
Net charge-offs									-155	-225	-284
Balance, end of year	1,691				1,486				1,691	1,486	1,672
Look back period to calculate historical loss of each segment									5 years	3 years
Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of year				376				590	376	590
Provision (reversal of allowance) for loan losses									146	-150
Allowance for loan losses on loans receivable after provision (reversal of allowance)									522	440
Charge-offs									-118	-299
Recoveries									9	235
Net charge-offs									-109	-64
Balance, end of year	413				376				413	376
Construction, Commercial and Other Mortgage Loans
Activity in allowance for loan losses
Balance, beginning of year				799				818	799	818
Provision (reversal of allowance) for loan losses									176	-31
Allowance for loan losses on loans receivable after provision (reversal of allowance)									975	787
Recoveries									2	12
Net charge-offs									2	12
Balance, end of year	977				799				977	799
Home Equity Loans and Lines of Credit
Activity in allowance for loan losses
Balance, beginning of year				10				35	10	35
Provision (reversal of allowance) for loan losses									1	18
Allowance for loan losses on loans receivable after provision (reversal of allowance)									11	53
Charge-offs									-10	-50
Recoveries									4	7
Net charge-offs									-6	-43
Balance, end of year	5				10				5	10
Consumer and Other
Activity in allowance for loan losses
Balance, beginning of year				229				107	229	107
Provision (reversal of allowance) for loan losses									76	252
Allowance for loan losses on loans receivable after provision (reversal of allowance)									305	359
Charge-offs									-57	-146
Recoveries									15	16
Net charge-offs									-42	-130
Balance, end of year	263				229				263	229
Unallocated
Activity in allowance for loan losses
Balance, beginning of year				72				122	72	122
Provision (reversal of allowance) for loan losses									-39	-50
Allowance for loan losses on loans receivable after provision (reversal of allowance)									33	72
Balance, end of year	$33				$72				$33	$72

Loans_Receivable_and_Allowance4

Loans Receivable and Allowance for Loan Losses (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Allowance for loan losses:
Collectively evaluated for impairment	$1,691	$1,486
Total ending allowance balance	1,691	1,486	1,672	1,541
Loans:
Individually evaluated for impairment	6,458	8,533
Collectively evaluated for impairment	963,445	849,495
Total ending loan balance	969,903	858,028
Residential Mortgage
Allowance for loan losses:
Collectively evaluated for impairment	413	376
Total ending allowance balance	413	376	590
Loans:
Individually evaluated for impairment	6,158	8,373
Collectively evaluated for impairment	924,732	814,960
Total ending loan balance	930,890	823,333
Construction, Commercial and Other Mortgage Loans
Allowance for loan losses:
Collectively evaluated for impairment	977	799
Total ending allowance balance	977	799	818
Loans:
Collectively evaluated for impairment	18,399	13,514
Total ending loan balance	18,399	13,514
Home Equity Loans and Lines of Credit
Allowance for loan losses:
Collectively evaluated for impairment	5	10
Total ending allowance balance	5	10	35
Loans:
Individually evaluated for impairment	296	160
Collectively evaluated for impairment	15,702	16,372
Total ending loan balance	15,998	16,532
Consumer and Other
Allowance for loan losses:
Collectively evaluated for impairment	263	229
Total ending allowance balance	263	229	107
Loans:
Individually evaluated for impairment	4
Collectively evaluated for impairment	4,612	4,649
Total ending loan balance	4,616	4,649
Unallocated
Allowance for loan losses:
Collectively evaluated for impairment	33	72
Total ending allowance balance	$33	$72	$122

Loans_Receivable_and_Allowance5

Loans Receivable and Allowance for Loan Losses (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Loans Receivable and Allowance for Loan Losses
Loans with no allocated allowance for loan losses	$6,458	$8,533
Total impaired loans	$6,458	$8,533

Loans_Receivable_and_Allowance6

Loans Receivable and Allowance for Loan Losses (Details 5) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impaired loans
Recorded Investment	$6,458	$8,533
Individually Evaluated for Impairment
Impaired loans
Recorded Investment	6,458	8,533	6,935
Unpaid Principal Balance	7,103	8,881	7,340
Average Recorded Investment	6,696	8,611	7,083
Interest Income Recognized	118	130	216
Loans individually evaluated for impairment with a related allowance for loan loss			0
Individually Evaluated for Impairment | One- to four-family residential
Impaired loans
Recorded Investment	6,158	8,373	6,775
Unpaid Principal Balance	6,775	8,716	7,175
Average Recorded Investment	6,383	8,451	6,924
Interest Income Recognized	118	130	210
Individually Evaluated for Impairment | Home Equity Loans and Lines of Credit
Impaired loans
Recorded Investment	296	160	160
Unpaid Principal Balance	324	165	165
Average Recorded Investment	309	160	159
Interest Income Recognized			6
Individually Evaluated for Impairment | Consumer and Other
Impaired loans
Recorded Investment	4
Unpaid Principal Balance	4
Average Recorded Investment	$4

Loans_Receivable_and_Allowance7

Loans Receivable and Allowance for Loan Losses (Details 6) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due
30 - 59 Days Past Due	$1,047	$387
60 - 89 Days Past Due	737	616
90 Days or Greater Past Due	758	1,577
Total Past Due	2,542	2,580
Loans Not Past Due	967,361	855,448
Total ending loan balance	969,903	858,028
Nonaccrual Loans	4,453	6,000
One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
30 - 59 Days Past Due	1,040	376
60 - 89 Days Past Due	736	612
90 Days or Greater Past Due	593	1,577
Total Past Due	2,369	2,565
Loans Not Past Due	919,624	815,917
Total ending loan balance	921,993	818,482
Nonaccrual Loans	4,153	5,840
Multi-family residential
Financing Receivable, Recorded Investment, Past Due
Loans Not Past Due	8,897	4,851
Total ending loan balance	8,897	4,851
Construction, Commercial and Other Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Loans Not Past Due	18,399	13,514
Total ending loan balance	18,399	13,514
Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment, Past Due
90 Days or Greater Past Due	161
Total Past Due	161
Loans Not Past Due	15,837	16,532
Total ending loan balance	15,998	16,532
Nonaccrual Loans	296	160
Loans on deposit accounts
Financing Receivable, Recorded Investment, Past Due
Loans Not Past Due	440	342
Total ending loan balance	440	342
Consumer and other loans
Financing Receivable, Recorded Investment, Past Due
30 - 59 Days Past Due	7	11
60 - 89 Days Past Due	1	4
90 Days or Greater Past Due	4
Total Past Due	12	15
Loans Not Past Due	4,164	4,292
Total ending loan balance	4,176	4,307
Nonaccrual Loans	$4

Loans_Receivable_and_Allowance8

Loans Receivable and Allowance for Loan Losses (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	loan	loan
Accounts, Notes, Loans and Financing Receivable
Nonaccrual Loans	$4,453,000	$6,000,000
Mortgage Loans on Real Estate | Minimum
Accounts, Notes, Loans and Financing Receivable
Loan delinquency period that may result in loss	90 days
Loan delinquency period after which an appraisal is obtained of the underlying collateral	5 months
Non Accrual Loans
Accounts, Notes, Loans and Financing Receivable
Number of loans	18	19
Nonaccrual Loans	4,500,000	6,000,000
Interest collected on nonaccrual loans recorded as a reduction of principal	244,000	164,000
Interest income collected and recognized in income			105,000
Non accrual loans, additional interest income that would have been recognized had the loans been accruing interest	$204,000	$222,000	$115,000

Loans_Receivable_and_Allowance9

Loans Receivable and Allowance for Loan Losses (Details 8) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	loan	item
		loan
Troubled debt restructurings
Number of loans subsequently defaulted	0
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	17	20
Loans modified by troubled debt restructurings considered impaired	$4,600,000	$5,800,000
Loans modified in troubled debt restructuring
Additional disclosures
Commitments to lend additional funds to borrowers	0
Performing Financing Receivable | Accruing interest
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	6	8
Loans modified by troubled debt restructurings considered impaired	2,000,000	2,500,000
Performing Financing Receivable | Non Accrual Loans
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	9	12
Loans modified by troubled debt restructurings considered impaired	2,200,000	3,300,000
Nonperforming Financing Receivable | Non Accrual Loans
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	2
Loans modified by troubled debt restructurings considered impaired	343,000
One- to four-family residential
Troubled debt restructurings
Number of Loans		2
Pre-Modification Recorded Investment		1,043,000
Post-Modification Recorded Investment		1,043,000
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	16	19
Loans modified by troubled debt restructurings considered impaired	4,400,000	5,600,000
Home Equity Loans and Lines of Credit
Additional disclosures
Number of loans modified by troubled debt restructurings considered impaired	1	1
Loans modified by troubled debt restructurings considered impaired	$135,000	$160,000

Recovered_Sheet1

Loans Receivable and Allowance for Loan Losses (Details 9) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable
Loans serviced for others	$60,500,000	$68,400,000	$84,800,000
Loans serviced for others, securitization for which the company continues to hold the related mortgage-backed securities	2,500,000	3,100,000	5,100,000
Loans serviced for others, amount of contractually specified servicing fees earned	179,000	213,000	275,000
Loans to related parties
Loans to directors and executive officers	1,500,000	1,600,000
Mortgage Loans on Real Estate | Maximum
Accounts, Notes, Loans and Financing Receivable
Loan to value ratio (as a percent)	80.00%
Residential Mortgage Loans Held For Sale
Accounts, Notes, Loans and Financing Receivable
Residential mortgage loans sold, loan amount	37,500,000	82,200,000	107,900,000
Residential mortgage loans sold, recognized gains	396,000	1,500,000	2,400,000
Number of loans	6	6
Residential mortgage loans held for sale	$1,000,000	$2,200,000

Accrued_Interest_Receivable_De

Accrued Interest Receivable (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Components of accrued interest receivable
Total	$4,436	$4,310
Investment securities
Components of accrued interest receivable
Total	1,562	1,707
Loans receivable
Components of accrued interest receivable
Total	2,872	2,601
Interest-bearing deposits
Components of accrued interest receivable
Total	$2	$2

Mortgage_Servicing_Assets_Deta

Mortgage Servicing Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mortgage Servicing Assets
Gain on sale of loans	$20,000	$36,000
Mortgage servicing assets
Balance at beginning of year	580,000	646,000
Additions	20,000	36,000
Impairments	-15,000
Amortization	-80,000	-102,000
Balance at end of year	505,000	580,000
Fair values and key assumptions used in determining the fair values of mortgage servicing assets
Fair value, beginning of year	617,000	651,000
Fair value, end of year	505,000	617,000
Annual cost to service (in dollars per loan)	55	55
Term of loan for which PSA prepayment model assumes increasing prepayment rates	30 months	30 months
Weighted Average
Fair values and key assumptions used in determining the fair values of mortgage servicing assets
Discount rate (as a percent)	10.50%	10.50%
Prepayment speed assumption (PSA prepayment speed)	178.90%	146.00%
Mortgage servicing assets
Gross carrying values, accumulated amortization, and net carrying values of mortgage servicing assets
Gross carrying value	1,358,000	1,353,000
Accumulated amortization	-853,000	-773,000
Net carrying value	505,000	580,000
Estimated amortization expense
2015	85,000
2016	65,000
2017	54,000
2018	45,000
2019	36,000
Thereafter	220,000
Net carrying value	$505,000	$580,000

Interest_Rate_Lock_and_Forward2

Interest Rate Lock and Forward Loan Sale Commitments (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Interest rate locks
Interest rate lock and forward loan sale commitments
Amount of derivatives	$6.40
Forward commitment | Loans receivable | Sale
Interest rate lock and forward loan sale commitments
Amount of derivatives	$7.40

Interest_Rate_Lock_and_Forward3

Interest Rate Lock and Forward Loan Sale Commitments (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets and liabilities related to derivatives
Fair value of asset derivatives	$62	$25
Fair value of liability derivatives	54	28
Interest rate contracts | Prepaid expenses and other assets
Assets and liabilities related to derivatives
Fair value of asset derivatives	62	25
Interest rate contracts | Accounts payable and accrued expenses
Assets and liabilities related to derivatives
Fair value of liability derivatives	$54	$28

Interest_Rate_Lock_and_Forward4

Interest Rate Lock and Forward Loan Sale Commitments (Details 3) (Interest rate contracts, Gain on sale of loans, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest rate contracts | Gain on sale of loans
Gains and losses related to derivatives
Gain (loss) related to derivatives	$11	($16)

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premises and equipment
Gross	$20,085,000	$18,214,000
Less accumulated depreciation and amortization	-14,474,000	-13,218,000
Net	5,611,000	4,996,000
Construction in progress	18,000	1,060,000
Total	5,629,000	6,056,000
Depreciation expense	1,400,000	1,100,000	1,100,000
Land
Premises and equipment
Gross	585,000	585,000
Buildings and improvements
Premises and equipment
Gross	1,008,000	597,000
Leasehold improvements
Premises and equipment
Gross	12,765,000	11,596,000
Furniture, fixtures and equipment
Premises and equipment
Gross	5,612,000	5,323,000
Automobiles
Premises and equipment
Gross	$115,000	$113,000

Deposits_Details

Deposits (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deposit amount
Non-interest bearing	$40,040,000	$33,032,000
Savings accounts	946,060,000	905,469,000
Certificates of deposit	221,737,000	209,998,000
Money market	749,000	807,000
Checking and Super NOW	151,093,000	139,403,000
Total	1,359,679,000	1,288,709,000
Interest rate
Savings accounts (as a percent)	0.36%	0.35%
Certificates of deposit (as a percent)	0.48%	0.55%
Money market (as a percent)	0.20%	0.20%
Checking and Super NOW (as a percent)	0.02%	0.02%
Total (as a percent)	0.33%	0.34%
Maturity of certificate of deposit accounts
2015	178,036,000
2016	11,707,000
2017	8,230,000
2018	4,407,000
2019	19,357,000
Total	221,737,000	209,998,000
Deposit with balances greater than or equal to $100,000
Total	170,600,000	157,500,000
Maximum amount of account owner deposit in bank insured by FDIC	250,000
Interest expense by type of deposit
Savings	3,369,000	3,035,000	4,294,000
Certificates of deposit and money market	1,075,000	1,232,000	1,606,000
Checking and Super NOW	30,000	29,000	36,000
Total	4,474,000	4,296,000	5,936,000
Overdrawn deposit accounts reclassified as loans	$77,000	$97,000

Advances_from_the_Federal_Home2

Advances from the Federal Home Loan Bank (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Advances from the Federal Home Loan Bank
Available additional unused FHLB advances	$399,000,000	$375,300,000
Advances outstanding
Due within one year	10,000,000		10,000,000
Due over 1 year to 2 years		10,000,000
Due over 2 years to 3 years			10,000,000
Due over 3 years to 4 years	5,000,000
Due over 4 years to 5 years		5,000,000
Total	$15,000,000	$15,000,000	$20,000,000
Weighted Average Rate
Due within one year (as a percent)	2.06%		2.12%
Due over 1 year to 2 years (as a percent)		2.06%
Due over 2 years to 3 years (as a percent)			2.06%
Due over 3 years to 4 years (as a percent)	1.20%
Due over 4 years to 5 years (as a percent)		1.20%
Total (as a percent)	1.77%	1.77%	2.09%

Securities_Sold_Under_Agreemen2

Securities Sold Under Agreements to Repurchase (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Securities sold under agreements to repurchase
Repurchase Liability		$72,000,000	$72,000,000
Amount prepaid	25,000,000
Prepayment penalty	321,000
Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)		1.88%	1.88%
1 year or less
Securities sold under agreements to repurchase
Repurchase Liability		47,000,000
1 year or less | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)		2.11%
Over 1 year to 2 years
Securities sold under agreements to repurchase
Repurchase Liability			47,000,000
Over 1 year to 2 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)			2.11%
Over 2 years to 3 years
Securities sold under agreements to repurchase
Repurchase Liability		25,000,000
Over 2 years to 3 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)		1.46%
Over 3 years to 4 years
Securities sold under agreements to repurchase
Repurchase Liability			$25,000,000
Over 3 years to 4 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)			1.46%

Securities_Sold_Under_Agreemen3

Securities Sold Under Agreements to Repurchase (Details 2) (Maturing Over 90 days, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Maturing Over 90 days
Securities sold under agreements to repurchase
Carrying Value of Securities	$75,251
Fair Value of Securities	76,600
Repurchase Liability	72,000
Amount at Risk	$4,600
Weighted Average Months to Maturity	13 months

Offsetting_of_Financial_Liabil2

Offsetting of Financial Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities sold under agreements to repurchase
Gross Amount of Recognized Liabilities	$72,000	$72,000
Net Amount of Liabilities Presented in the Balance Sheet	72,000	72,000
Gross amount not offset in the balance sheet
Financial Instruments	$72,000	$72,000

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	Dec. 31, 2011
Current
Federal									$8,047	$8,746	$7,221
State									1,984	1,956	1,668
Total current									10,031	10,702	8,889
Deferred
Federal									-730	-1,531	-500
State									-392	-325	-92
Total deferred									-1,122	-1,856	-592
Total income tax expense	2,430	2,273	2,026	2,180	2,137	2,298	2,244	2,167	8,909	8,846	8,297
Federal statutory corporate tax rate (as a percent)										35.00%	35.00%	35.00%
Reconciliation of tax provision
Income tax expense at statutory rate									8,052	8,223	8,097
Income tax effect of:
Other tax-exempt income									-371	-373	-330
Share-based compensation									83
Share-based compensation										-188	-307
State income taxes, net of federal income tax benefits									1,035	1,060	1,024
Other									110	124	-187
Total income tax expense	$2,430	$2,273	$2,026	$2,180	$2,137	$2,298	$2,244	$2,167	$8,909	$8,846	$8,297
Effective income tax rate (as a percent)									38.72%	37.65%	35.86%

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Components of income taxes payable (receivable)
Current taxes payable	$826	$1,414
Deferred taxes receivable	-7,254	-5,075
Total	-6,428	-3,661
State
Components of income taxes payable (receivable)
Current taxes payable	1,701	1,960
Deferred taxes receivable	-1,644	-1,057
Federal
Components of income taxes payable (receivable)
Current taxes (receivable)	-875	-546
Deferred taxes receivable	($5,610)	($4,018)

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Premises and equipment	$1,521	$1,309
Hawaii franchise tax	678	782
Unfunded pension liability	2,099	1,381
Allowance for loan losses	669	591
Impaired asset write-down	2,503	2,580
Employee benefit plans	2,750	1,880
Equity incentive plan	1,475	1,286
Unrealized loss on available-for-sale securities	48	49
Deferred compensation	729	166
Other	24	10
Total	12,496	10,034
Deferred tax liabilities:
Net deferred loan fees	2,619	2,155
FHLB stock dividends	2,301	2,453
Prepaid expense	122	121
Premium on loans sold	200	230
Total	5,242	4,959
Net deferred tax assets	7,254	5,075
Valuation allowance for deferred tax assets	$0	$0

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (Pension Plan)	0 Months Ended	12 Months Ended
	Dec. 31, 2008	Dec. 31, 2014
Employee benefit plans
Vesting percentage on completion of vesting period		100.00%
Minimum
Employee benefit plans
Requisite service period for receiving benefits under the plan		1 year
Vesting period	5 years

Employee_Benefit_Plans_Details1

Employee Benefit Plans (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plan
Employee benefit plans
Accumulated benefit obligation at end of year	$17,687	$14,966
Change in projected benefit obligation:
Benefit obligation at beginning of year	14,966	14,644
Service cost	92	108	117
Interest cost	727	611	625
Actuarial loss (gain)	2,353	-59
Benefits paid	-451	-338
Benefit obligation at end of year	17,687	14,966	14,644
Change in plan assets:
Fair value of plan assets at beginning of year	12,723	11,659
Actual return on plan assets	334	1,402
Employer contributions	1,000
Benefits paid	-451	-338
Fair value of plan assets at end of year	13,606	12,723	11,659
Funded status at end of year	-4,081	-2,243
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	8,355	5,542
Accumulated other comprehensive loss, before tax	8,355	5,542	6,295
Pension Plan | Accounts payable and accrued expenses
Amounts recognized in the consolidated balance sheets:
Accounts payable and accrued expenses - liability	-4,081	-2,243
Supplemental Employee Retirement Plan (SERP)
Employee benefit plans
Accumulated benefit obligation at end of year	8,754	8,595
Change in projected benefit obligation:
Benefit obligation at beginning of year	8,595	8,408
Service cost	59	95	158
Interest cost	117	109	98
Benefits paid	-17	-17
Benefit obligation at end of year	8,754	8,595	8,408
Change in plan assets:
Employer contributions	17	17
Benefits paid	-17	-17
Funded status at end of year	-8,754	-8,595
Supplemental Employee Retirement Plan (SERP) | Accounts payable and accrued expenses
Amounts recognized in the consolidated balance sheets:
Accounts payable and accrued expenses - liability	($8,754)	($8,595)

Employee_Benefit_Plans_Details2

Employee Benefit Plans (Details 3) (Pension Plan, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plan
Changes recognized in accumulated other comprehensive loss
Accumulated other comprehensive loss at beginning of year, before tax	$5,542	$6,295
Actuarial net loss (gain) arising during the period	2,943	-590
Amortizations (recognized in net periodic benefit cost):
Actuarial loss	-130	-163
Total recognized in other comprehensive loss	2,813	-753
Accumulated other comprehensive loss at end of year, before tax	$8,355	$5,542

Employee_Benefit_Plans_Details3

Employee Benefit Plans (Details 4)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pension Plan
Weighted average assumptions used to determine the year-end benefit obligations
Discount rate (as a percent)	4.10%	4.90%
Pension Plan | Domestic equity securities
Normal target allocation
Normal target allocation (as a percent)	55.00%
Pension Plan | International equity securities
Normal target allocation
Normal target allocation (as a percent)	10.00%
Pension Plan | Bonds
Normal target allocation
Normal target allocation (as a percent)	35.00%
Supplemental Employee Retirement Plan (SERP)
Weighted average assumptions used to determine the year-end benefit obligations
Discount rate (as a percent)	5.06%	5.02%
Rate of compensation increase (as a percent)	5.00%	5.00%

Employee_Benefit_Plans_Details4

Employee Benefit Plans (Details 5) (Pension Plan, USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets measured at fair values
Fair value of assets	$13,606	$12,723	$11,659
Cash
Assets measured at fair values
Fair value of assets	1,041	225
Money Market Funds
Assets measured at fair values
Fair value of assets	1,274	609
Equity
Assets measured at fair values
Fair value of assets	7,720	1,400
Mutual Funds
Assets measured at fair values
Fair value of assets	3,571	10,489
Level 1
Assets measured at fair values
Fair value of assets	13,606	12,723
Level 1 | Cash
Assets measured at fair values
Fair value of assets	1,041	225
Level 1 | Money Market Funds
Assets measured at fair values
Fair value of assets	1,274	609
Level 1 | Equity
Assets measured at fair values
Fair value of assets	7,720	1,400
Level 1 | Mutual Funds
Assets measured at fair values
Fair value of assets	$3,571	$10,489

Employee_Benefit_Plans_Details5

Employee Benefit Plans (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Estimated prior service cost and net actuarial loss that will be amortized from AOCI into net periodic pension benefit cost
Prior service cost	$0
Net actuarial loss	197,000
Pension Plan
Estimated future benefit payments
2015	721,000
2016	745,000
2017	762,000
2018	798,000
2019	858,000
2020 - 2024	4,916,000
Total	8,800,000
Assumptions used to determine the net periodic benefit cost:
Discount rate (as a percent)	4.90%	4.20%	4.90%
Expected return on plan assets (as a percent)	7.50%	7.75%	7.75%
Net periodic benefit cost for the year:
Service cost	92,000	108,000	117,000
Interest cost	727,000	611,000	625,000
Expected return on plan assets	-924,000	-870,000	-845,000
Recognized actuarial loss	130,000	163,000	117,000
Net periodic benefit cost	25,000	12,000	14,000
Supplemental Employee Retirement Plan (SERP)
Estimated future benefit payments
2015	6,516,000
2016	17,000
2017	17,000
2018	53,000
2019	161,000
2020 - 2024	3,220,000
Total	9,984,000
Assumptions used to determine the net periodic benefit cost:
Discount rate (as a percent)	5.06%	5.06%	5.05%
Rate of compensation increase (as a percent)	5.00%	5.00%	5.00%
Net periodic benefit cost for the year:
Service cost	59,000	95,000	158,000
Interest cost	117,000	109,000	98,000
Net periodic benefit cost	176,000	204,000	256,000
Expected contribution
2015	$6,500,000

Employee_Benefit_Plans_Details6

Employee Benefit Plans (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
401(k) plan
Defined Contribution Plan Disclosure [Line Items]
Requisite service period for receiving benefits under the plan	1 year
Company matching contribution of employees' contributions (as a percent)	5.00%	5.00%	5.00%
Employer's matching contribution (in dollars)	$50,000	$51,000	$50,000
Profit sharing plan
Defined Contribution Plan Disclosure [Line Items]
Requisite service period for receiving benefits under the plan	1 year
Employer's matching contribution (in dollars)	$0	$0	$0

Employee_Stock_Ownership_Plan_1

Employee Stock Ownership Plan (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 10, 2009
Employee Stock Ownership Plan
ESOP expense	$1,036,000	$1,125,000	$1,082,000
ESOP
Employee Stock Ownership Plan
Amount borrowed from employer				9,800,000
Shares purchased				978,650
Percentage of shares issued in initial public offering				8.00%
Employee stock ownership plan, price per share of shares acquired in initial public offering (in dollars per share)				$10
Term of loan	20 years
ESOP expense	872,000	1,000,000
Allocated shares	283,381	239,241
Unearned shares	685,057	733,989
Total ESOP shares	968,438	973,230
Fair value of unearned shares, in thousands	$14,763,000	$17,029,000
ESOP | Prime rate
Employee Stock Ownership Plan
Variable interest rate	prime rate, as published in The Wall Street Journal

Employee_Stock_Ownership_Plan_2

Employee Stock Ownership Plan (Details 2) (ESOP restoration, Certain executives, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
ESOP restoration | Certain executives
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Accrued benefits	$231,000	$296,000

ShareBased_Compensation_Detail

Share-Based Compensation (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-Based Compensation
Compensation expense	$2,676	$2,676	$2,690
Income tax benefit	$1,074	$1,291	$1,432
2010 Equity Incentive Plan
Share-Based Compensation
Number of shares authorized	1,712,637
2010 Equity Incentive Plan | Minimum
Share-Based Compensation
Period for recognition of award cost	5 years
Vesting period	5 years
2010 Equity Incentive Plan | Maximum
Share-Based Compensation
Period for recognition of award cost	6 years
Vesting period	6 years

ShareBased_Compensation_Detail1

Share-Based Compensation (Details 2) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock option activity
Exercised (in shares)			41,275
Stock Options
Stock option activity
Balance at beginning of year (in shares)	832,954	832,954	871,144
Granted (in shares)			3,085
Exercised (in shares)			41,275
Balance at end of year (in shares)	832,954	832,954	832,954	871,144
Options vested and exercisable (in shares)	555,097
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$17.38	$17.38	$17.36
Granted (in dollars per share)			$23.62
Exercised (in dollars per share)			$17.36
Balance at end of year (in dollars per share)	$17.38	$17.38	$17.38	$17.36
Options vested and exercisable (in dollars per share)	$17.38
Remaining Contractual Life
Beginning of year	5 years 8 months 5 days	6 years 8 months 5 days	7 years 8 months 1 day	8 years 8 months 1 day
Granted			9 years 8 months 1 day
End of year	5 years 8 months 5 days	6 years 8 months 5 days	7 years 8 months 1 day	8 years 8 months 1 day
Options vested and exercisable	5 years 8 months 5 days
Aggregate Intrinsic Value
Beginning of year	$4,845	$4,554	$2,082
Exercised			171
End of year	3,471	4,845	4,554	2,082
Options vested and exercisable	2,314
Stock option activity
Intrinsic value of stock options exercised			171
Cash received from stock options exercised			717
Tax benefits realized from stock options exercised			69
Total fair value of stock options that vested	$2,852	$3,223	$3,175

ShareBased_Compensation_Detail2

Share-Based Compensation (Details 3) (Stock Options, USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
Share-Based Compensation
Unrecognized compensation costs	$1.20
Vested (in shares)	138,929
Minimum
Share-Based Compensation
Unrecognized compensation costs, period of recognition	5 years
Vesting period	5 years
Maximum
Share-Based Compensation
Unrecognized compensation costs, period of recognition	6 years
Vesting period	6 years

ShareBased_Compensation_Detail3

Share-Based Compensation (Details 4) (Restricted Stock, USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Awards
Non-vested at beginning of year (in shares)	340,065	453,397	563,994
Granted (in shares)			2,735
Vested (in shares)	113,332	113,332	113,332
Non-vested at end of year (in shares)	226,733	340,065	453,397
Weighted Average Grant Date Fair Value
Non-vested at beginning of year (in dollars per share)	$17.39	$17.39	$17.36
Granted (in dollars per share)			$23.62
Vested (in dollars per share)	$17.39	$17.39	$17.39
Non-vested at end of year (in dollars per share)	$17.39	$17.39	$17.39
Unrecognized compensation
Unrecognized compensation costs	$3.30
Minimum
Unrecognized compensation
Unrecognized compensation costs, period of recognition	5 years
Vesting period	5 years
Maximum
Unrecognized compensation
Unrecognized compensation costs, period of recognition	6 years
Vesting period	6 years

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
Net income	$3,454	$3,462	$3,719	$3,462	$3,514	$3,831	$3,661	$3,641	$14,097	$14,647	$14,838
Weighted-average number of shares used in:
Basic earnings per share (in shares)									9,211,409	9,711,233	10,113,453
Dilutive common stock equivalents:
Stock options and restricted stock units (in shares)									105,914	133,709	99,737
Diluted earnings per share (in shares)									9,317,323	9,844,942	10,213,190
Net income per common share, basic (in dollars per share)	$0.37	$0.38	$0.41	$0.38	$0.37	$0.40	$0.37	$0.37	$1.53	$1.51	$1.47
Net income per common share, diluted (in dollars per share)	$0.37	$0.37	$0.40	$0.37	$0.37	$0.39	$0.36	$0.36	$1.51	$1.49	$1.45

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
Changes in the components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period	$3,787	$4,333	$3,770
Other comprehensive income before reclassifications	1,601	-546	563
Net current period other comprehensive income	1,601	-546	563
Balance at end of period	5,388	3,787	4,333
Unfunded Pension Liability
Changes in the components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period	3,338	3,792	2,966
Other comprehensive income before reclassifications	1,694	-454	826
Net current period other comprehensive income	1,694	-454	826
Balance at end of period	5,032	3,338	3,792
Noncredit Related Losses on Securities Not Expected to Be Sold
Changes in the components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period	376	445	679
Other comprehensive income before reclassifications	-92	-69	-234
Net current period other comprehensive income	-92	-69	-234
Balance at end of period	284	376	445
Unrealized Loss on Securities
Changes in the components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period	73	96	125
Other comprehensive income before reclassifications	-1	-23	-29
Net current period other comprehensive income	-1	-23	-29
Balance at end of period	$72	$73	$96

Other_Comprehensive_Loss_Detai1

Other Comprehensive Loss (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated other comprehensive loss
Pretax amount	$2,658	($907)	$903
Tax	-1,057	361	-340
Net current period other comprehensive income	1,601	-546	563
Unfunded Pension Liability
Accumulated other comprehensive loss
Pretax amount	2,813	-753	1,341
Tax	-1,119	299	-515
Net current period other comprehensive income	1,694	-454	826
Noncredit Related Losses on Securities Not Expected to Be Sold
Accumulated other comprehensive loss
Pretax amount	-153	-116	-389
Tax	61	47	155
Net current period other comprehensive income	-92	-69	-234
Unrealized Loss on Securities
Accumulated other comprehensive loss
Pretax amount	-2	-38	-49
Tax	1	15	20
Net current period other comprehensive income	($1)	($23)	($29)

Commitments_Details

Commitments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments to originate loans
Loan Commitments
Commitment amount	$18.10	$15
Commitments to originate loans | Minimum
Loan Commitments
Interest rate (as a percent)	2.75%	3.13%
Commitments to originate loans | Maximum
Loan Commitments
Interest rate (as a percent)	5.50%	5.38%
Unused lines of credit to borrowers
Loan Commitments
Commitment amount	$24.90	$23.70

Commitments_Details_2

Commitments (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Lease Commitments
Minimum rental expense	$2,800,000	$2,700,000	$2,600,000
Future minimum rental commitments under all noncancelable operating leases
2015	2,641,000
2016	2,458,000
2017	2,211,000
2018	1,547,000
2019	1,109,000
Thereafter	1,529,000
Total	11,495,000
Future minimum rental income for noncancelable lease
2014	110,000
2015	110,000
2016	110,000
2017	110,000
2018	110,000
Thereafter	220,000
Total	770,000
Minimum rental income	110,000	110,000	110,000
Reserve Requirements
Federal Reserve Bank reserve requirements	$9,600,000	$8,400,000

Regulatory_Capital_and_Supervi2

Regulatory Capital and Supervision (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Reconciliation of Bank equity to regulatory capital
Bank equity	$216,378	$212,140	$218,972	$213,961
Accumulated other comprehensive loss	5,388	3,787	4,333	3,770
Territorial Savings Bank
Core (Tier 1) capital
Required Amount	151,548	64,817
Required Percentage	9.00%	4.00%
Actual Amount	203,708	200,074
Actual Percentage	12.10%	12.35%
Excess over requirement	52,160	135,257
Tangible capital
Required Amount	25,258	24,307
Required Percentage	1.50%	1.50%
Actual Amount	203,708	200,074
Actual Percentage	12.10%	12.35%
Excess over requirement	178,450	175,767
Risk-based capital
Required Amount	54,902	50,407
Required Percentage	8.00%	8.00%
Actual Amount	205,403	201,566
Actual Percentage	29.93%	31.99%
Excess over requirement	150,501	151,159
Tier 1 risk-based capital
Required Amount	27,451	25,204
Required Percentage	4.00%	4.00%
Actual Amount	203,708	200,074
Actual Percentage	29.68%	31.75%
Excess over requirement	176,257	174,870
Reconciliation of Bank equity to regulatory capital
Bank equity	198,370	196,563
Intangible assets		-251
Disallowed servicing assets	-51	-25
Accumulated other comprehensive loss	5,388	3,787
Core and tangible capital	203,708	200,074
Allowance for loan losses - general, including allowance for credit losses on off-balance sheet credit exposures	1,695	1,492
Regulatory risk-based capital - computed	$205,403	$201,566

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	36 Months Ended	84 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
	Transaction
Trust preferred securities
Investment Securities
Number of transactions of the securities owned by the company	5
Securities issued		0
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Trust preferred securities | LIBOR
Investment Securities
Discount rate variable rate basis			three-month LIBOR	three-month LIBOR
Discount rate, margin added to variable rate (as a percent)			20.00%	20.00%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | PreTSL XXIII
Investment Securities
Fair value estimate per $100 par value (in dollars per security par value)	19.47	19.47	19.47
Investment securities fair value assumptions, par value	100	100	100

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Investment securities held to maturity	$586,710	$598,007
Accrued interest receivable	4,436	4,310
Liabilities
Current income taxes payable	826	1,414
Advance payments by borrowers for taxes and insurance	3,916	3,708
Carrying Amount
Assets
Cash and cash equivalents	75,060	75,365
Investment securities held to maturity	572,922	613,436
FHLB stock	11,234	11,689
FRB stock	2,925
Loans held for sale	1,048	2,210
Loans receivable, net	968,212	856,542
Accrued interest receivable	4,436	4,310
Interest rate contracts	62	25
Liabilities
Deposits	1,359,679	1,288,709
Advances from the Federal Home Loan Bank	15,000	15,000
Securities sold under agreements to repurchase	72,000	72,000
Accounts payable and accrued expenses (excluding interest rate contracts)	24,044	23,905
Interest rate contracts	54	28
Current income taxes payable	826	1,414
Advance payments by borrowers for taxes and insurance	3,916	3,708
Estimated Fair Value
Assets
Cash and cash equivalents	75,060	75,365
Investment securities held to maturity	586,710	598,007
FHLB stock	11,234	11,689
FRB stock	2,925
Loans held for sale	1,079	2,252
Loans receivable, net	998,183	880,852
Accrued interest receivable	4,436	4,310
Interest rate contracts	62	25
Liabilities
Deposits	1,360,074	1,289,348
Advances from the Federal Home Loan Bank	14,977	15,110
Securities sold under agreements to repurchase	72,334	73,151
Accounts payable and accrued expenses (excluding interest rate contracts)	24,044	23,905
Interest rate contracts	54	28
Current income taxes payable	826	1,414
Advance payments by borrowers for taxes and insurance	3,916	3,708
Estimated Fair Value | Level 1
Assets
Cash and cash equivalents	75,060	75,365
Accrued interest receivable	4,436	4,310
Liabilities
Deposits	1,137,942	1,078,712
Accounts payable and accrued expenses (excluding interest rate contracts)	24,044	23,905
Current income taxes payable	826	1,414
Advance payments by borrowers for taxes and insurance	3,916	3,708
Estimated Fair Value | Level 2
Assets
Investment securities held to maturity	586,020	597,470
FHLB stock	11,234	11,689
FRB stock	2,925
Loans held for sale	1,079	2,252
Interest rate contracts	62	25
Liabilities
Interest rate contracts	54	28
Estimated Fair Value | Level 3
Assets
Investment securities held to maturity	690	537
Loans receivable, net	998,183	880,852
Liabilities
Deposits	222,132	210,636
Advances from the Federal Home Loan Bank	14,977	15,110
Securities sold under agreements to repurchase	$72,334	$73,151

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Details 3) (Fair Value, Measurements, Recurring, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Level 2
Assets and Liabilities Measured at Fair Value on Recurring Basis
Interest rate contracts - assets	$62	$25
Interest rate contracts - liabilities	-54	-28
Estimated Fair Value
Assets and Liabilities Measured at Fair Value on Recurring Basis
Interest rate contracts - assets	62	25
Interest rate contracts - liabilities	($54)	($28)

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments (Details 4) (Fair Value, Measurements, Nonrecurring, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Impaired loans
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Total Gains (Losses)	($4)	$76
Trust preferred securities
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Total Gains (Losses)	153	116
Mortgage servicing assets
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Total Gains (Losses)	-15
Level 3 | Impaired loans
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	327	5,456
Level 3 | Trust preferred securities
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	690	537
Level 3 | Mortgage servicing assets
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	505
Estimated Fair Value | Impaired loans
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	327	5,456
Estimated Fair Value | Trust preferred securities
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	690	537
Estimated Fair Value | Mortgage servicing assets
Assets Measured at Fair Value on Nonrecurring Basis and Related Losses
Fair value	$505

Fair_Value_of_Financial_Instru6

Fair Value of Financial Instruments (Details 5) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Annual cost to service (in dollars per loan)	55	55
Fair Value, Measurements, Nonrecurring | Level 3 | Impaired loans
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Fair Value	$327	$5,456
Fair Value, Measurements, Nonrecurring | Level 3 | Trust preferred securities
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Fair Value	690	537
Fair Value, Measurements, Nonrecurring | Level 3 | Mortgage servicing assets
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Fair Value	$505
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Impaired loans
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Discount rate (as a percent)	6.10%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Impaired loans | Minimum
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Discount rate (as a percent)		3.15%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Impaired loans | Maximum
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Discount rate (as a percent)		6.94%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Trust preferred securities | LIBOR
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Discount rate variable rate basis	three-month LIBOR	three-month LIBOR
Discount rate, margin added to variable rate (as a percent)	20.00%	20.00%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Mortgage servicing assets
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Discount rate (as a percent)	10.50%
Annual cost to service (in dollars per loan)	55
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Mortgage servicing assets | Minimum
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Prepayment speed (PSA) (as percent)	164.80%
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted cash flow model | Mortgage servicing assets | Maximum
Significant Unobservable Inputs for Level Three Nonrecurring Fair Value Measurements
Prepayment speed (PSA) (as percent)	262.50%

Parent_Company_Only_Details

Parent Company Only (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets
Prepaid expenses and other assets	$1,874	$1,978
Total assets	1,691,897	1,616,904
Liabilities and Equity
Equity	216,378	212,140	218,972	213,961
Total liabilities and stockholders' equity	1,691,897	1,616,904
Territorial Bancorp Inc.
Assets
Cash	16,155	13,079	10,369	10,970
Investment in Territorial Savings Bank	198,370	196,563
Receivable from Territorial Savings Bank	2,262	933
Prepaid expenses and other assets	23	2,103
Total assets	216,810	212,678
Liabilities and Equity
Other liabilities	432	538
Equity	216,378	212,140
Total liabilities and stockholders' equity	$216,810	$212,678

Parent_Company_Only_Details_2

Parent Company 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
Interest and dividend income:
Total interest and dividend income	$15,087	$14,990	$14,881	$14,657	$14,419	$14,091	$13,783	$13,882	$59,615	$56,175	$60,149
Noninterest expense:
Salaries									20,932	21,015	20,609
Other general and administrative expenses									4,106	4,403	4,226
Total noninterest expense	8,618	9,079	8,747	8,864	9,046	8,720	8,595	8,716	35,308	35,077	34,438
Income before income taxes	5,884	5,735	5,745	5,642	5,651	6,129	5,905	5,808	23,006	23,493	23,135
Income taxes	2,430	2,273	2,026	2,180	2,137	2,298	2,244	2,167	8,909	8,846	8,297
Territorial Bancorp Inc.
Interest and dividend income:
Dividends from Territorial Savings Bank									14,000	25,000	11,788
Interest-earning deposit with Territorial Savings Bank									20	26	32
Total interest and dividend income									14,020	25,026	11,820
Noninterest expense:
Salaries									37	37	37
Other general and administrative expenses									837	728	763
Total noninterest expense									874	765	800
Income before income taxes									13,146	24,261	11,020
Income taxes									-360	-299	-297
Income before equity in undistributed earnings in subsidiaries									13,506	24,560	11,317
Equity in undistributed earnings of Territorial Savings Bank, net of dividends									591	-9,913	3,521
Net income									$14,097	$14,647	$14,838

Parent_Company_Only_Details_3

Parent Company Only (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Adjustments to reconcile net income to net cash provided by operating activities:
ESOP expense	$1,036,000	$1,125,000	$1,082,000
Excess tax benefits from share-based compensation			-54,000
Net decrease in prepaid expenses and other assets	104,000	1,754,000	837,000
Net cash provided by operating activities	14,094,000	17,336,000	17,580,000
Cash flows from financing activities:
Excess tax benefits from share-based compensation			54,000
Proceeds from issuance of common stock, net of costs			717,000
Repurchases of company stock	-5,612,000	-19,595,000	-8,025,000
Cash dividends paid	-6,634,000	-6,231,000	-5,728,000
Net cash provided by financing activities	58,724,000	22,036,000	20,128,000
Net increase (decrease) in cash and cash equivalents	-305,000	-107,453,000	50,881,000
Territorial Bancorp Inc.
Cash flows from operating activities:
Net income	14,097,000	14,647,000	14,838,000
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of Territorial Savings Bank, net of dividends	-591,000	9,913,000	-3,521,000
ESOP expense	1,036,000	1,125,000	1,082,000
Excess tax benefits from share-based compensation			-54,000
Net decrease in prepaid expenses and other assets	751,000	2,325,000	172,000
Net increase (decrease) in other liabilities	29,000	526,000	-136,000
Net cash provided by operating activities	15,322,000	28,536,000	12,381,000
Cash flows from financing activities:
Excess tax benefits from share-based compensation			54,000
Proceeds from issuance of common stock, net of costs			717,000
Repurchases of company stock	-5,612,000	-19,595,000	-8,025,000
Cash dividends paid	-6,634,000	-6,231,000	-5,728,000
Net cash provided by financing activities	-12,246,000	-25,826,000	-12,982,000
Net increase (decrease) in cash and cash equivalents	3,076,000	2,710,000	-601,000
Cash at beginning of the period	13,079,000	10,369,000	10,970,000
Cash at end of the period	$16,155,000	$13,079,000	$10,369,000

Unaudited_Quarterly_Financial_2

Unaudited Quarterly Financial Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per 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
Unaudited Quarterly Financial Information
Interest and dividend income	$15,087	$14,990	$14,881	$14,657	$14,419	$14,091	$13,783	$13,882	$59,615	$56,175	$60,149
Interest expense	1,555	1,551	1,512	1,500	1,452	1,520	1,610	1,700	6,118	6,282	9,229
Net interest income	13,532	13,439	13,369	13,157	12,967	12,571	12,173	12,182	53,497	49,893	50,920
Provision (reversal of allowance) for loan losses	172	23	156	9	-8	45	-16	18	360	39	415
Net interest income after provision for loan losses	13,360	13,416	13,213	13,148	12,975	12,526	12,189	12,164	53,137	49,854	50,505
Noninterest income	1,142	1,398	1,279	1,358	1,722	2,323	2,311	2,360	5,177	8,716	7,068
Noninterest expense	8,618	9,079	8,747	8,864	9,046	8,720	8,595	8,716	35,308	35,077	34,438
Income before income taxes	5,884	5,735	5,745	5,642	5,651	6,129	5,905	5,808	23,006	23,493	23,135
Income taxes	2,430	2,273	2,026	2,180	2,137	2,298	2,244	2,167	8,909	8,846	8,297
Net income	$3,454	$3,462	$3,719	$3,462	$3,514	$3,831	$3,661	$3,641	$14,097	$14,647	$14,838
Basic earnings per share (in dollars per share)	$0.37	$0.38	$0.41	$0.38	$0.37	$0.40	$0.37	$0.37	$1.53	$1.51	$1.47
Diluted earnings per share (in dollars per share)	$0.37	$0.37	$0.40	$0.37	$0.37	$0.39	$0.36	$0.36	$1.51	$1.49	$1.45
Cash dividends declared per common share (in dollars per share)	$0.26	$0.15	$0.15	$0.14	$0.24	$0.13	$0.13	$0.12	$0.70	$0.62	$0.54

Subsequent_Events_Details

Subsequent Events (Details) (USD $)

3 Months Ended

12 Months Ended

0 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

Jan. 26, 2015

Subsequent Events

Quarterly cash dividend declared on common stock (in dollars per share)

$0.26

$0.15

$0.15

$0.14

$0.24

$0.13

$0.13

$0.12

$0.70

$0.62

$0.54

Subsequent event

Subsequent Events

Quarterly cash dividend declared on common stock (in dollars per share)

$0.16