Territorial Bancorp (TBNK) 10-K 15 Mar 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 29, 2024	Jun. 30, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Entity File Number	001-34403
Entity Registrant Name	Territorial Bancorp Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	26-4674701
Entity Address, Address Line One	1003 Bishop Street, Pauahi Tower Suite 500
Entity Address, City or Town	Honolulu
Entity Address, State or Province	HI
Entity Address, Postal Zip Code	96813
City Area Code	808
Local Phone Number	946-1400
Title of 12(b) Security	Common stock
Trading Symbol	TBNK
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Public Float			$ 99.2
Entity Filer Category	Non-accelerated Filer
Document Financial Statement Error Correction [Flag]	false
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		8,826,613
Auditor Name	Moss Adams LLP
Auditor Firm ID	659
Auditor Location	Portland, Oregon
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0001447051
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 126,659	$ 40,553
Investment securities available for sale, at fair value	20,171	20,821
Investment securities held to maturity, at amortized cost (fair value of $568,128 and $591,084 at December 31, 2023 and December 31, 2022, respectively)	685,728	717,773
Loans receivable	1,308,552	1,296,796
Loans receivable		1,296,796
Allowance for credit/loan losses	(5,121)	(2,032)
Allowance for credit/loan losses		(2,032)
Loans receivable, net of allowance for credit/loan losses	1,303,431
Loans receivable, net of allowance for credit/loan losses		1,294,764
Federal Home Loan Bank stock, at cost	12,192	8,197
Federal Reserve Bank stock, at cost	3,180	3,170
Accrued interest receivable	6,105	6,115
Premises and equipment, net	7,185	7,599
Right-of-use asset, net	12,371	14,498
Bank-owned life insurance	48,638	47,783
Income taxes receivable	344
Deferred income tax assets, net	2,457	1,643
Prepaid expenses and other assets	8,211	6,676
Total assets	2,236,672	2,169,592
Liabilities:
Deposits	1,636,604	1,716,152
Advances from the Federal Home Loan Bank	242,000	141,000
Advances from the Federal Reserve Bank	50,000
Securities sold under agreements to repurchase	10,000	10,000
Accounts payable and accrued expenses	23,334	24,180
Lease liability	17,297	15,295
Income taxes payable		838
Advance payments by borrowers for taxes and insurance	6,351	5,577
Total liabilities	1,985,586	1,913,042
Stockholders' Equity:
Common stock, $0.01 par value; authorized 100,000,000 shares; issued and outstanding 8,826,613 and 9,071,076 shares at December 31, 2023 and December 31, 2022, respectively	88	91
Additional paid-in capital	48,022	51,825
Unearned ESOP shares	(2,447)	(2,936)
Retained earnings	211,644	215,314
Accumulated other comprehensive loss	(6,221)	(7,744)
Total stockholders' equity	251,086	256,550
Total liabilities and stockholders' equity	$ 2,236,672	$ 2,169,592

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Consolidated Balance Sheets
Investment securities held to maturity, fair value (in dollars)	$ 568,128	$ 591,084
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, authorized shares	50,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common stock, par value (in dollars per share)	$ 0.01
Common stock, authorized shares	100,000,000
Common stock, shares issued	8,826,613	9,071,076
Common stock, shares outstanding	8,826,613	9,071,076

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Interest income:
Loans	$ 47,043,000	$ 45,318,000
Investment securities	17,918,000	16,211,000
Other investments	4,127,000	1,173,000
Total interest income	69,088,000	62,702,000
Interest expense:
Deposits	19,484,000	4,925,000
Advances from the Federal Home Loan Bank	6,636,000	2,107,000
Securities sold under agreements to repurchase	183,000	183,000
Advances from the Federal Reserve Bank	154,000
Total interest expense	26,457,000	7,215,000
Net interest income	42,631,000	55,487,000
Reversal of provision for credit losses	(3,000)	(576,000)
Reversal of provision for credit losses		(576,000)
Net interest income after reversal of provision for credit losses	42,634,000	56,063,000
Noninterest income:
Service and other fees	1,327,000	1,416,000
Income on bank-owned life insurance	855,000	792,000
Net gain (loss) on sale of loans	10,000	(3,000)
Other	279,000	2,004,000
Total noninterest income	2,471,000	4,209,000
Noninterest expense:
Salaries and employee benefits	20,832,000	22,259,000
Occupancy	6,910,000	6,708,000
Equipment	5,156,000	5,006,000
Federal deposit insurance premiums	982,000	573,000
Other general and administrative expenses	4,388,000	4,252,000
Total noninterest expense	38,268,000	38,798,000
Income before income taxes	6,837,000	21,474,000
Income taxes	1,810,000	5,318,000
Net income	$ 5,027,000	$ 16,156,000
Basic earnings per share (in dollars per share)	$ 0.58	$ 1.81
Diluted earnings per share (in dollars per share)	0.57	1.80
Cash dividends declared per common share (in dollars per share)	$ 0.74	$ 1.02
Basic weighted-average shares outstanding (in shares)	8,636,495	8,865,946
Diluted weighted-average shares outstanding (in shares)	8,684,092	8,920,714
Service and Other Fees
Noninterest income:
Service and other fees	$ 1,327,000	$ 1,416,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Comprehensive Income
Net Income (Loss)	$ 5,027	$ 16,156
Unfunded pension liability	1,280	(222)
Unrealized gain (loss) on securities	243	(1,998)
Total other comprehensive income (loss), net of tax	1,523	(2,220)
Comprehensive income	$ 6,550	$ 13,936

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Unearned ESOP Shares	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Total
Balance at Dec. 31, 2021	$ 93	$ 56,951	$ (3,425)	$ 208,227	$ (5,524)	$ 256,322
Balance (in shares) at Dec. 31, 2021	9,324,060
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)				16,156		16,156
Other comprehensive (loss) income					(2,220)	(2,220)
Cash dividends declared				(9,069)		(9,069)
Share-based compensation		480				480
Share-based compensation (in shares)	19,227
Allocation of ESOP shares		602	489			1,091
Exercise of options for common stock	$ (2)	(6,208)				(6,210)
Exercise of options for common stock (in shares)	(272,211)
Balance at Dec. 31, 2022	$ 91	51,825	(2,936)	215,314	(7,744)	256,550
Balance (in shares) at Dec. 31, 2022	9,071,076
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)				5,027		5,027
Other comprehensive (loss) income					1,523	1,523
Cumulative change in accounting principle (1)				(2,319)		(2,319)
Cash dividends declared				(6,378)		(6,378)
Share-based compensation		177				177
Share-based compensation (in shares)	12,729
Allocation of ESOP shares		203	489			692
Exercise of options for common stock	$ (3)	(4,183)				(4,186)
Exercise of options for common stock (in shares)	(257,192)
Balance at Dec. 31, 2023	$ 88	$ 48,022	$ (2,447)	$ 211,644	$ (6,221)	$ 251,086
Balance (in shares) at Dec. 31, 2023	8,826,613

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Consolidated Statements of Stockholders' Equity, Share Data
Cash dividends declared per common share (in dollars per share) | $ / shares	$ 0.74
Common Stock
Consolidated Statements of Stockholders' Equity, Share Data
Allocation of ESOP shares, shares | shares	48,933

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 5,027,000	$ 16,156,000
Adjustments to reconcile net income to net cash used in operating activities:
Reversal of provision for credit losses	(3,000)	(576,000)
Reversal of provision for credit losses		(576,000)
Depreciation and amortization	1,093,000	1,181,000
Deferred income tax expense	(525,000)	1,090,000
(Accretion) amortization of fees, discounts, and premiums, net	(367,000)	(171,000)
Amortization of right-of-use asset	2,820,000	2,946,000
Origination of loans held for sale	(813,000)	(5,302,000)
Proceeds from sales of loans held for sale	823,000	5,299,000
(Gain) loss on sale of loans, net	(10,000)	3,000
Net loss on disposal of premises and equipment	5,000
Proceeds from bank-owned life insurance		(1,138,000)
ESOP expense	692,000	1,091,000
Share-based compensation expense	177,000	480,000
Net decrease (increase) in accrued interest receivable	(34,000)	(329,000)
Net increase in bank-owned life insurance	(855,000)	(792,000)
Net decrease (increase) in prepaid expenses and other assets	(1,537,000)	289,000
Net decrease in accounts payable and accrued expenses	863,000	1,006,000
Net decrease in lease liability	1,309,000	(2,911,000)
Net increase (decrease) in advance payments by borrowers for taxes and insurance	774,000	(630,000)
Net increase in income taxes payable	(1,182,000)	(1,026,000)
Net cash used in operating activities	8,257,000	16,666,000
Cash flows from investing activities:
Purchases of investment securities held to maturity	(6,693,000)	(142,336,000)
Purchases of investment securities available for sale		(24,760,000)
Principal repayments on investment securities held to maturity	38,859,000	61,009,000
Principal repayments on investment securities available for sale	1,038,000	1,279,000
Principal repayments on loans receivable, net of loan originations	(11,640,000)	8,739,000
Purchases of Federal Home Loan Bank stock	(5,887,000)	(1,304,000)
Proceeds from redemption of Federal Home Loan Bank stock	1,892,000	1,280,000
Purchases of Federal Reserve Bank stock	(11,000)	(13,000)
Proceeds from redemption of Federal Reserve Bank Stock	1,000
Proceeds from bank-owned life insurance		5,569,000
Purchases of premises and equipment	(685,000)	(4,715,000)
Net cash provided by (used in) investing activities	16,874,000	(95,252,000)
Cash flows from financing activities:
Net decrease in deposits	(79,548,000)	34,324,000
Proceeds from advances from the Federal Home Loan Bank	146,000,000	22,000,000
Repayments of advances from the Federal Home Loan Bank	(45,000,000)	(22,000,000)
Proceeds from advances from the Federal Reserve Bank	90,020,000
Repayments of advances from the Federal Reserve Bank	(40,020,000)
Repurchases of common stock	(4,065,000)	(5,973,000)
Cash dividends paid	(6,412,000)	(9,071,000)
Net cash provided by (used in) financing activities	60,975,000	19,280,000
Net change in cash and cash equivalents	86,106,000	(59,306,000)
Cash and cash equivalents at beginning of the year	40,553,000	99,859,000
Cash and cash equivalents at end of the year	126,659,000	40,553,000
Cash paid for:
Interest on deposits and borrowings	25,975,000	6,549,000
Income taxes	3,516,000	5,254,000
Supplemental disclosure of noncash investing and financing activities:
Company stock repurchased through stock swap and net settlement transactions	121,000	236,000
Establishment of right-of-use asset, net of incentives and modifications	693,000	7,462,000
Establishment of lease liability, net of modifications	$ 693,000	$ 7,462,000

Organization

Organization	12 Months Ended
	Dec. 31, 2023
Organization
Organization	(1) Organization ​ Territorial Bancorp Inc. is a Maryland corporation and is the holding company for Territorial Savings Bank. Territorial Savings Bank is a Hawaii state-chartered bank headquartered in Honolulu, Hawaii and is a member of the Federal Reserve System. Territorial Savings Bank has ​

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
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 repayments on outstanding loans receivable and investments, borrowings from the Federal Home Loan Bank (FHLB), Federal Reserve Bank (FRB), 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 subsidiary. 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, 2023 and 2022, the Company had $20.2 million and $20.8 million, respectively, of securities classified as available-for-sale and the remaining securites were classified as held-to-maturity. ​ 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 income line item in the Consolidated Statements of Income. Interest income is 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 credit 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 nonaccrual 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 write-down of the asset. Costs related to holding real estate are charged to expense while costs related to development and improvements are capitalized. Net gains or losses recognized on the sale of real estate owned are included in other general and administrative expenses. ​ (i) Allowance for Credit Losses (ACL) on Loans and Securities ​ The current expected credit losses (CECL) accounting standard requires an estimate of the credit losses expected over the life of the financial instrument. CECL replaces the incurred loss approach that delayed the recognition of a credit loss until it was probable that a loss event occurred. The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the ACL during the period when management deems the loan to be uncollectible and all interest previously accrued but not collected is reversed against the current period ACL. ​ The estimate of expected credit losses is based on information about past events, current conditions, and reasonable and supportable forecasts that affect the collectability of financial instruments. Historical loss experience is generally the starting point for estimating expected credit losses. The Company considers whether the historical loss experience should be adjusted for asset specific risk characteristics or current conditions at the reporting date that did not exist over the historical reporting period. These qualitative adjustments can include changes in the economy, loan underwriting standards, and delinquency trends. The Company then considers future economic conditions as part of the one year reasonable and supportable forecast period. ​ Our loan portfolio is segmented into three pools for estimating our allowance for credit losses on loans: real estate, commercial, and consumer loans. They were established upon the adoption of ASU 2016-13. Only three pools are used to segment our loan portfolio because loans within the pools share similar risk characteristics and were originated using similar underwriting standards. Loans that do not share similar risk characteristics would be evaluated on an individual basis and excluded from the collective evaluation. Historically, we have disclosed information about our loans and allowance based on class of financing receivable. The portfolio segments align with the class of financing receivables as follows: ● Real estate: One- to four-family residential, multi-family residential, and commercial mortgage ● Commercial: Commercial loans other than mortgage loans ● Consumer: Home equity loans, loans on deposit accounts, and all other consumer loans ​ Collateral dependent loans are not considered to share the same risk characteristics with the three pools discussed above . A loan is considered to be collateral dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For loans which are considered to be collateral dependent, the Company has elected to estimate the expected credit loss based on the fair value of the collateral less selling costs. If the fair value of the collateral less selling costs is less than the loan’s amortized cost basis, the Company records a partial charge-off to reduce the loan’s amortized cost basis for the difference between the collateral fair value less selling costs and the amortized cost basis. ​ The ACL on loans and accrued interest is calculated on a loan by loan basis. If the loan’s amortized cost basis is less than the total present value of cash flows calculated using a discounted cash flow approach, the ACL is equal to the amortized cost basis minus the total present value of cash flows on the loan discounted by the loan’s effective interest rate. The expected cash flows include estimates of loan charge-offs, recoveries, and prepayments. Economic variables which have a strong correlation with our historical loan charge-offs, recoveries, and prepayments are utilized in forecasting loan charge-offs, recoveries, and prepayments during the one year reasonable and supportable forecast period. After the reasonable and supportable forecast period, the historical reversion rate is used to calculate loan charge-offs, recoveries, and prepayments for the remaining expected life of the loan. The reversion rate is based on historical averages and applied on a straight-line basis. Qualitative adjustments may be made to account for current conditions and forward looking events not captured in the quantitative calculation. The forecast and reversion rate utilize historical behavior during select periods of time. Our Real Estate and Consumer loan pools utilize a vintage approach where historical losses, recoveries, and prepayment experience is determined using loans that have originated in the same period. Our Commercial loans utilize a reporting period approach where historical losses, recoveries, and prepayment experience is considered during a selected historical period of time. Off-balance sheet forecasts utilize a reporting period approach. ​ Loans receivable are stated at amortized cost which includes the principal amount outstanding, less the allowance for credit/loan losses, deferred loan origination fees and costs, commitment fees, and cumulative net charge-offs. Interest income on loans receivable is accrued as earned. Accrued interest receivable on loans was accrued interest receivable on the Consolidated Balance Sheet. ​ The Company determines delinquency status by considering the number of days full payments required by the contractual terms of the loan are past due. 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, unless the loans are well secured and in the process of collection. When a loan is placed on nonaccrual status, all interest previously accrued and not collected is reversed against current period provision for credit losses. For nonaccrual 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. ​ The Company’s off-balance sheet credit exposures are comprised of unfunded portions of existing loans, such as lines of credit and construction loans, and commitments to originate loans that are not conditionally cancellable by the Company. Under the CECL accounting standard, expected credit losses on these amounts are calculated using a forecasted estimate of the likelihood that funding of the unfunded amount/commitment will occur and the historical reversion rate. Changes to the reserve for off-balance sheet credit exposures are recorded through increases or decreases to the provision for credit losses on the Consolidated Statements of Income. There were no reserves for off-balance sheet credit exposures at December 31, 2023. Prior to the adoption of the CECL accounting standard, the Company had a reserve for off-balance sheet credit exposures of $49,000 at December 31, 2022. ​ While management utilizes its best judgment and information available, the adequacy of the ACL and the reserve for off-balance sheet credit exposures is determined by certain factors outside of the Company's control, such as the performance of our portfolios, changes in the economic environment including economic uncertainty, changes in interest rates and loan prepayments, and the view of the regulatory authorities toward classification of assets and the level of ACL and the reserve for off-balance sheet credit exposures. Additionally, the level of ACL and the reserve for off-balance sheet credit exposures may fluctuate based on the balance and mix of the loan portfolio, changes in loan prepayments and off-balance sheet credit exposures, changes in charge-off rates, and changes in forecasted economic conditions. If actual results differ significantly from our assumptions, our ACL and the reserve for off-balance sheet credit exposures may not be sufficient to cover inherent losses in our loan portfolio, resulting in additions to our ACL and an increase in the provision for credit losses. ​ The Company is required to utilize the CECL methodology to estimate expected credit losses with respect to held-to-maturity (HTM) investment securities. Since all of the Company’s HTM investment securities were issued by U.S. government agencies or U.S. government-sponsored enterprises, which include the explicit and/or implicit guarantee of the U.S. government and have a long history of no credit losses, the Company has not recorded a credit loss on these securities. The unrealized losses on these securities were due to changes in interest rates, relative to when the securities were purchased, and are not due to decreases in the credit quality of the securities. ​ Available for sale (AFS) investment securities in an unrealized loss position are evaluated for impairment. The Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell, the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the investment securities amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the investment security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an ACL is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an ACL is recognized in other comprehensive income. The Company has not recorded an ACL related to our AFS investment securities. ​ Changes in the ACL are recorded as a provision (or reversal of provision) for credit losses. Losses are charged against the ACL when management believes the uncollectibility of an AFS security is confirmed or when either of the criteria regarding intent or requirement to sell is met. ​ (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 or a U.S. government agency. The Company receives of the mortgage-backed securities issued. The mortgage-backed securities received in securitizations are valued at fair value and classified as held-to-maturity. A gain or loss in the securitization transactions is recognized for the difference between the fair value of the mortgage-backed securities received and the amortized cost of the loans securitized. ​ 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. The amount of mortgage servicing rights is immaterial to the financial statement. ​ (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 . 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, 2023 and 2022, the Company had not recognized a liability for income tax uncertainties in the accompanying Consolidated Balance Sheets because management concluded that the Company does not have material uncertain tax positions. ​ The Company recognizes interest and penalties related to tax liabilities in other interest expense and other general and administrative expenses, respectively, in the Consolidated Statements of Income. ​ Tax years 2020 and after currently remain subject to examination by the Internal Revenue Service and 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 or other income, 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) Share-Based Compensation ​ The Company grants share-based compensation awards, including restricted stock and restricted stock units, which are either performance-based or time-based. The fair value of the restricted stock and restricted stock unit awards were based on the closing price of the Company’s stock on the date of grant. The cost of these awards are amortized in the Consolidated Statements of Income on a straight-line basis over the vesting period. The amount of performance-based restricted stock units that vest on a performance condition is remeasured quarterly based on how the Company’s return on average equity compares to the SNL Bank Index. The number of performance-based restricted stock units that are expected to vest based on the Company’s return on average equity is determined quarterly and the amortization of these stock awards is adjusted for any changes in the restricted stock units that are expected to vest. The fair value of performance-based restricted stock units that are based on how the Company’s total stock return compares to the SNL Bank Index was measured using a Monte-Carlo valuation. The number of performance-based restricted stock units that are based on the Company’s total stock return is amortized over the vesting period and is not adjusted for performance. ​ ​ (p) Supplemental Employee Retirement Plan (SERP) ​ The SERP is a noncontributory supplemental retirement plan covering certain current and former employees of the Company. Benefits in the SERP plan are paid after retirement, in addition to the benefits provided by the Pension Plan. The Company accrues SERP costs over the estimated period until retirement by charging salaries and employee benefits expense in the Consolidated Statements of Income, with a corresponding credit to accounts payable and accrued expenses in the Consolidated Balance Sheets. ​ (q) 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. ​ (r) Earnings Per Share ​ We have two forms of our outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Unvested restricted stock awards that are time-based contain nonforfeitable rights to dividends or dividend equivalents are considered to be participating securities in the earnings per share computation using the two-class method. Under the two-class method, earnings are allocated to common shareholders and participating securities according to their respective rights to earnings. Unvested restricted stock awards that vest based on performance or market conditions are not considered to be participating securities in the earnings per share calculation because accrued dividends on shares that do not vest are forfeited. ​ Basic earnings per share is computed by dividing net income allocated to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income allocated to common shareholders 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. ​ (s) Common Stock Repurchase Program ​ 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. During 2023 and 2022, the Company repurchased per share, respectively, as part of the repurchase programs authorized by the Board of Directors. ​ (t) 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 of the Bank’s Tier 1 capital plus the allowance for loan losses. At December 31, 2023, this limit was ​ (u) Leases ​ The Company records a right-of-use (ROU) asset for those leases that convey rights to control use of identified assets for a period of time in exchange for consideration. The Company is also required to record a lease liability for the present value of future payment commitments. The Company leases most of its premises and some vehicles and equipment under operating leases expiring on various dates through 2037. The majority of lease agreements relate to real estate and generally provide that the Company pay taxes, insurance, maintenance and certain other variable operating expenses applicable to the leased premises. Variable lease components and nonlease components are not included in the Company’s computation of the ROU asset or lease liability. The Company also does not include short-term leases in the computation of the ROU asset or lease liability. Short-term leases are leases with a term at commencement of 12 months or less. Short-term lease expense is recorded on a straight-line basis over the term of the lease. Lease agreements do not contain any residual value guarantees or restrictive covenants. ​ The value of the ROU asset and lease liability is impacted by the amount of the periodic payment required, length of the lease term, lease incentives and the discount rate used to calculate the present value of the minimum lease payments. Certain leases have renewal options at the expiration of the lease terms. Generally, option periods are not included in the computation of the lease term, ROU asset or lease liability because the Company is not reasonably certain to exercise renewal options at the expiration of the lease terms. Because the discount rates implicit in our leases are not known, discount rates have been estimated using the rates for fixed-rate, amortizing advances from the FHLB for the approximate terms of the leases. ​ (v) 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 credit losses; valuation of certain investment securities; valuation allowances for deferred income tax assets; and assets and obligations related to employee benefit plans. Accordingly, actual results could differ from those estimates. ​ (w) Recently Issued Accounting Pronouncements ​ In June 2016, the Financial Accounting Standards Board (FASB) issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU changed the threshold for recognizing losses from a “probable” to an “expected” model. The new model is referred to as the current expected credit loss model and applies to loans, leases, held-to-maturity investments, loan commitments, and financial guarantees. The standard requires the measurement of all expected credit losses for financial assets as of the reporting date (including historical experience, current conditions, and reasonable and supportable forecasts) and enhanced disclosures that will help financial statement users understand the estimates and judgments used in estimating credit losses and evaluating the credit quality of an organization’s portfolio. The amendment was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. In November 2019, the FASB issued an update that delayed the effective date of the amendment for smaller reporting companies, as defined by the Securities and Exchange Commission, to fiscal years beginning after December 15, 2022. The Company is a smaller reporting company. The Company adopted the standard on January 1, 2023, and applied the standard’s provisions as a cumulative-effect adjustment to retained earnings as of January 1, 2023. Upon adoption of the standard, the Company recorded a $3.2 million increase to the reserve for credit losses, which included a decrease of $49,000 in the reserves for off-balance sheet credit exposures. This resulted in a $2.3 million after-tax decrease to retained earnings as of January 1, 2023. The tax effect resulted in an increase in deferred tax assets. ​ In March 2022, the FASB issued ASU 2022-02, Financial Instruments-Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The ASU eliminates the accounting guidance for loans modified as troubled debt restructurings by creditors while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Additionally, the ASU requires public business entities to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases. This ASU was effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, upon the Company’s adoption of the amendments in ASU 2016-13. The Company adopted the standard on January 1, 2023, and it did not have a material effect on the Company’s consolidated financial statements. ​ In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions to clarify that contractual sale restrictions should not be considered in the measurement of the fair value of an equity security. The Company owns stock in the Federal Reserve Bank (FRB) and in the Federal Home Loan Bank (FHLB) which is valued at historical cost which approximates fair value. Ownership of stock is a condition for services the Company receives from the FRB and FHLB. The stock is not publicly traded and can only be issued, exchang

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2023
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) 2023 2022 Cash and due from banks ​ $ 10,471 ​ $ 9,722 ​ Interest-earning deposits in other banks ​ 116,188 ​ 30,831 ​ Cash and cash equivalents ​ $ 126,659 ​ $ 40,553 ​ ​ Interest-earning deposits in other banks consist primarily of deposits at the Federal Reserve Bank of San Francisco.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2023
Investment Securities
Investment Securities	(4) Investment Securities ​ The amortized cost and fair values of investment securities are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ Gross Unrealized ​ Estimated ​ ​ (Dollars in thousands) Cost Gains Losses Fair Value ACL December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ 22,563 ​ $ — $ (2,392) ​ $ 20,171 ​ $ — Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 685,728 ​ ​ 68 ​ (117,668) ​ ​ 568,128 ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 708,291 ​ $ 68 $ (120,060) ​ $ 588,299 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ 23,544 ​ $ — $ (2,723) ​ $ 20,821 ​ ​ ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 717,773 ​ ​ 62 ​ (126,751) ​ ​ 591,084 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 741,317 ​ $ 62 $ (129,474) ​ $ 611,905 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized Estimated (Dollars in thousands) Cost Fair Value Available-for-sale: ​ ​ ​ ​ ​ ​ ​ Due after 10 years ​ $ 22,563 ​ $ 20,171 ​ Total ​ $ 22,563 ​ $ 20,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ Due within 5 years ​ $ 14 ​ $ 14 ​ Due after 5 years through 10 years ​ 7 ​ 6 ​ Due after 10 years ​ 685,707 ​ 568,108 ​ Total ​ $ 685,728 ​ $ 568,128 ​ ​ The Company did not sell any held-to-maturity or available-for-sale securities during 2023 and 2022. ​ Investment securities with amortized cost of $555.8 million and $272.8 million at December 31, 2023 and 2022, respectively, were pledged to secure deposits made by state and local governments, securities sold under agreements to repurchase, transaction clearing accounts, and Federal Reserve Bank borrowings. Included in these amounts were $74.0 million and $5.4 million pledged to the Federal Reserve Bank’s discount window at December 31, 2023 and 2022, respectively, and $202.1 million pledged to the Federal Reserve Bank’s Term Funding Program at December 31, 2023. ​ Provided below is a summary of investment securities which were in an unrealized loss position at December 31, 2023 and 2022. The Company does not intend to sell 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, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ — ​ $ — ​ $ 20,171 ​ $ (2,392) 4 ​ $ 20,171 ​ $ (2,392) ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 10,326 ​ ​ (107) ​ ​ 554,514 ​ ​ (117,561) 152 ​ ​ 564,840 ​ ​ (117,668) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 10,326 ​ $ (107) ​ $ 574,685 ​ $ (119,953) ​ 156 ​ $ 585,011 ​ $ (120,060) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ — ​ ​ — ​ ​ — ​ Mortgage-backed securities issued by U.S. government sponsored enterprises ​ $ 20,821 ​ $ (2,723) ​ $ — ​ $ — 4 ​ $ 20,821 ​ $ (2,723) ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 210,128 ​ ​ (22,209) ​ ​ 377,418 ​ ​ (104,542) 148 ​ ​ 587,546 ​ ​ (126,751) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 230,949 ​ $ (24,932) ​ $ 377,418 ​ $ (104,542) ​ 152 ​ $ 608,367 ​ $ (129,474) ​ ​ Mortgage-Backed Securities. The unrealized losses on the Company’s investment in mortgage-backed securities were caused by increases in market interest rates subsequent to purchase. 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 cost basis, no allowance for credit losses was recorded for these securities as of December 31, 2023. Prior to the adoption of ASU 2016-13, the company did not consider any of its investments to be other-than-temporarily impaired as of December 31, 2022.

Federal Home Loan Bank Stock

Federal Home Loan Bank Stock	12 Months Ended
	Dec. 31, 2023
FHLB stock
Federal Home Loan Bank Stock
Federal Home Loan Bank Stock	(5) Federal Home Loan Bank Stock ​ The Bank, as a member of the FHLB system, is required to obtain and hold shares of capital stock in the FHLB. At December 31, 2023 and 2022, the Bank met such requirement. At December 31, 2023 and 2022, the Bank owned ​ The Company evaluated its investment in the stock of the FHLB Des Moines 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 FHLB Des Moines, the Company did not consider its FHLB stock other-than-temporarily impaired. There were no observable, orderly transactions at a price that would require the Company to update the value of the stock of the FHLB Des Moines. ​

Federal Reserve Bank Stock

Federal Reserve Bank Stock	12 Months Ended
	Dec. 31, 2023
FRB stock
Federal Reserve Bank Stock
Federal Reserve Bank Stock	(6) Federal Reserve Bank Stock ​ The Bank, as a member of the Federal Reserve System, is required to hold shares of capital stock of the FRB of San Francisco equal to 6% of capital and surplus of the Bank. At December 31, 2023 and 2022 the Bank met such requirement. At December 31, 2023 and 2022, the Bank owned ​ The Company evaluated its investment in the stock of the FRB 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. There were no observable, orderly transactions at a price that would require the Company to update the value of the stock of the FRB of San Francisco. ​

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2023
Loans Receivable and Allowance for Credit Losses
Loans Receivable and Allowance for Credit Losses	(7) Loans Receivable and Allowance for Credit Losses ​ The components of loans receivable, net of allowance for credit losses (ACL) under ASC 326 as of December 31, 2023 and net of allowance for loan losses under ASC 310 as of December 31, 2022 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ (Dollars in thousands) 2023 2022 ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ First mortgages: ​ ​ ​ ​ ​ ​ ​ One- to four-family residential ​ $ 1,277,544 ​ $ 1,253,558 ​ Multi-family residential ​ 5,855 ​ 6,448 ​ Construction, commercial, and other ​ 11,631 ​ 23,903 ​ Home equity loans and lines of credit ​ 7,058 ​ 6,426 ​ Total real estate loans ​ 1,302,088 ​ 1,290,335 ​ Other loans: ​ ​ ​ ​ ​ ​ ​ Loans on deposit accounts ​ 196 ​ 216 ​ Consumer and other loans ​ 8,257 ​ 8,381 ​ Total other loans ​ ​ 8,453 ​ ​ 8,597 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ 1,310,541 ​ 1,298,932 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unearned fees and discounts ​ (1,989) ​ (2,136) ​ Total loans, net of unearned fees and discounts ​ 1,308,552 ​ 1,296,796 ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit/loan losses ​ (5,121) ​ (2,032) ​ Loans receivable, net of allowance for credit/loan losses ​ $ 1,303,431 ​ $ 1,294,764 ​ ​ The table below presents the activity in the allowance for credit/loan losses by portfolio segment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction, Home Commercial, Equity and Other Loans and Residential Mortgage Lines of Consumer (Dollars in thousands) Mortgage Loans Credit and Other Unallocated Totals Year ended December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, beginning of year ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​ Adoption of ASU No. 2016-13 ​ ​ 3,393 ​ ​ 71 ​ ​ (1) ​ ​ 5 ​ ​ (259) ​ ​ 3,209 ​ (Reversal of provision) provision for credit losses ​ (110) ​ 9 ​ — ​ 98 ​ — ​ (3) ​ ​ ​ 4,546 ​ 514 ​ — ​ 178 ​ — ​ 5,238 ​ Charge-offs ​ (75) ​ — ​ — ​ (82) ​ — ​ (157) ​ Recoveries ​ 31 ​ — ​ — ​ 9 ​ — ​ 40 ​ Net charge-offs ​ (44) ​ — ​ — ​ (73) ​ — ​ (117) ​ Balance, end of year ​ $ 4,502 ​ $ 514 ​ $ — ​ $ 105 ​ $ — ​ $ 5,121 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, beginning of year ​ $ 1,814 ​ $ 435 ​ $ 1 ​ $ 89 ​ $ 330 ​ $ 2,669 ​ (Reversal of provision) provision for loan losses ​ (551) ​ (1) ​ — ​ 47 ​ (71) ​ (576) ​ ​ ​ 1,263 ​ 434 ​ 1 ​ 136 ​ 259 ​ 2,093 ​ Charge-offs ​ — ​ — ​ — ​ (62) ​ — ​ (62) ​ Recoveries ​ — ​ — ​ — ​ 1 ​ — ​ 1 ​ Net charge-offs ​ — ​ — ​ — ​ (61) ​ — ​ (61) ​ Balance, end of year ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​ ​ We recorded a reversal of credit loss provision of $3,000 under ASC 326 for the year ended December 31, 2023 that was primarily due to a decrease in provisions for the mortgage loan portfolio, which was partially offset by an increase in provisions for the consumer loan portfolio. The decrease in provisions in the mortgage loan portfolio was primarily due to a decrease in forecasted charge-offs, which was partially offset by an increase in the loan portfolio and a decrease in forecasted prepayments. The increase in provisions for the consumer loan portfolio was primarily due to an increase in the consumer loan portfolio and forecasted charge-offs and a decrease in forecasted prepayments. ​ The table below presents the balance in the allowance for loan losses and the recorded investment in loans, net of unearned fees and discounts, by portfolio segment, and based on impairment method as of December 31, 2022, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction, Home Commercial, Equity and Other Loans and Residential Mortgage Lines of Consumer (Dollars in thousands) Mortgage Loans Credit and Other Unallocated Totals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Ending allowance balance: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Collectively evaluated for impairment ​ 1,263 ​ 434 ​ 1 ​ 75 ​ 259 ​ 2,032 ​ Total ending allowance balance ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Ending loan balance: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ 2,693 ​ $ — ​ $ 16 ​ $ — ​ $ 6 ​ $ 2,715 ​ Collectively evaluated for impairment ​ 1,255,300 ​ 23,775 ​ 6,411 ​ 8,595 ​ — ​ 1,294,081 ​ Total ending loan balance ​ $ 1,257,993 ​ $ 23,775 ​ $ 6,427 ​ $ 8,595 ​ $ 6 ​ $ 1,296,796 ​ ​ The table below presents the balance of impaired loans individually evaluated for impairment by class of loans as of December 31, 2022, in accordance with ASC 310 prior to the adoption of ASU 2016-13: ​ ​ ​ ​ ​ ​ ​ ​ ​ Unpaid Recorded Principal (Dollars in thousands) Investment Balance December 31, 2022: ​ ​ ​ ​ ​ ​ ​ With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 2,693 ​ $ 3,209 ​ Home equity loans and lines of credit ​ ​ 16 ​ ​ 30 ​ Consumer loans ​ ​ 6 ​ 6 ​ Total ​ $ 2,715 ​ $ 3,245 ​ ​ ​ The table below presents the average recorded investment and interest income recognized on impaired loans by class of loans as of December 31, 2022, in accordance with ASC 310 prior to the adoption of ASU 2016-13: ​ ​ ​ ​ ​ ​ ​ ​ ​ Average Recorded Interest Income (Dollars in thousands) Investment Recognized 2022: ​ ​ ​ ​ ​ ​ ​ With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 2,776 ​ $ 24 ​ Home equity loans and lines of credit ​ 17 ​ — ​ Consumer loans ​ 6 ​ — ​ Total ​ $ 2,799 ​ $ 24 ​ ​ There were no loans individually evaluated for impairment with a related allowance for loan loss as of December 31, 2022. At December 31, 2022, loans individually evaluated for impairment did not have an allocated allowance for loan loss because they were written down to fair value at the time of impairment. At December 31, 2022, an impaired loan would also not have an allocated allowance if the value of the property securing the loan, less the cost to sell the property, was greater than the loan balance. ​ The Company primarily uses the aging of loans to monitor the credit quality of its loan portfolio. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving Loans ​ ​ ​ ​ Amortized Cost of Term Loans by Origination Year ​ Amortized ​ ​ ​ (Dollars in thousands) ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Cost Basis ​ Total December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Loans not past due ​ ​ 387 ​ ​ 353 ​ ​ 4,836 ​ ​ — ​ ​ 203 ​ ​ 856 ​ ​ 1,230 ​ ​ 7,865 Total Commercial ​ ​ 387 ​ ​ 353 ​ ​ 4,836 ​ ​ — ​ ​ 203 ​ ​ 856 ​ ​ 1,230 ​ ​ 7,865 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ ​ 4 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 4 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Loans not past due ​ ​ 271 ​ ​ 80 ​ ​ 20 ​ ​ 4 ​ ​ 14 ​ ​ 42 ​ ​ 6,137 ​ ​ 6,568 Total Consumer ​ ​ 275 ​ ​ 80 ​ ​ 20 ​ ​ 4 ​ ​ 14 ​ ​ 42 ​ ​ 6,137 ​ ​ 6,572 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 428 ​ ​ — ​ ​ 428 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 140 ​ ​ 87 ​ ​ — ​ ​ 227 Loans not past due ​ ​ 91,195 ​ ​ 129,148 ​ ​ 283,571 ​ ​ 183,887 ​ ​ 91,113 ​ ​ 514,546 ​ ​ — ​ ​ 1,293,460 Total Real Estate ​ ​ 91,195 ​ ​ 129,148 ​ ​ 283,571 ​ ​ 183,887 ​ ​ 91,253 ​ ​ 515,061 ​ ​ — ​ ​ 1,294,115 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 91,857 ​ $ 129,581 ​ $ 288,427 ​ $ 183,891 ​ $ 91,470 ​ $ 515,959 ​ $ 7,367 ​ $ 1,308,552 ​ The Company did not have any revolving loans that converted to term loans during the year ended December 31, 2023. ​ The following table presents by loan class and year of origination, the gross charge-offs recorded during the year ended December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Total Year ended December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 13 ​ $ 62 ​ $ 75 Loans on deposit accounts ​ ​ 78 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 78 Consumer and other ​ ​ 1 ​ ​ — ​ ​ — ​ ​ — ​ ​ 3 ​ ​ — ​ ​ 4 Total ​ $ 79 ​ $ — ​ $ — ​ $ — ​ $ 16 ​ $ 62 ​ $ 157 ​ The table below presents the aging of loans and accrual status by class of loans, net of unearned fees and discounts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans 90 Days or More 30 - 59 60 - 89 90 Days or Past Due Days Past Days Past More Total Past Loans Not Total Nonaccrual and Still (Dollars in thousands) Due Due Past Due Due Past Due Loans Loans Accruing December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 428 ​ $ — ​ $ 227 ​ $ 655 ​ $ 1,274,960 ​ $ 1,275,615 ​ $ 2,079 ​ $ — ​ Multi-family residential mortgages ​ — ​ — ​ — ​ — ​ 5,848 ​ 5,848 ​ — ​ — ​ Construction, commercial, and other mortgages ​ — ​ — ​ — ​ — ​ 11,570 ​ 11,570 ​ — ​ — ​ Home equity loans and lines of credit ​ — ​ — ​ — ​ — ​ 7,060 ​ 7,060 ​ 11 ​ — ​ Loans on deposit accounts ​ — ​ — ​ — ​ — ​ 196 ​ 196 ​ — ​ — ​ Consumer and other ​ 4 ​ — ​ — ​ 4 ​ 8,259 ​ 8,263 ​ 170 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 432 ​ $ — ​ $ 227 ​ $ 659 ​ $ 1,307,893 ​ $ 1,308,552 ​ $ 2,260 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ — ​ $ 409 ​ $ 559 ​ $ 968 ​ $ 1,250,586 ​ $ 1,251,554 ​ $ 2,279 ​ $ — ​ Multi-family residential mortgages ​ — ​ — ​ — ​ — ​ 6,439 ​ 6,439 ​ — ​ — ​ Construction, commercial, and other mortgages ​ — ​ — ​ — ​ — ​ 23,775 ​ 23,775 ​ — ​ — ​ Home equity loans and lines of credit ​ — ​ — ​ — ​ — ​ 6,427 ​ 6,427 ​ 16 ​ — ​ Loans on deposit accounts ​ — ​ — ​ — ​ — ​ 217 ​ 217 ​ — ​ — ​ Consumer and other ​ 6 ​ — ​ 6 ​ 12 ​ 8,372 ​ 8,384 ​ 6 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 6 ​ $ 409 ​ $ 565 ​ $ 980 ​ $ 1,295,816 ​ $ 1,296,796 ​ $ 2,301 ​ $ — ​ ​ The table below presents the amortized cost basis of loans on nonaccrual status as of December 31, 2023 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 December 31, 2022 (Dollars in thousands) Nonaccrual Loans With a Related ACL Nonaccrual Loans Without a Related ACL Total Nonaccrual Loans Total Nonaccrual Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 1,030 ​ $ 1,049 ​ $ 2,079 ​ $ 2,279 Home equity loans and lines of credit ​ ​ 11 ​ ​ — ​ ​ 11 ​ ​ 16 Consumer and other ​ ​ 170 ​ ​ — ​ ​ 170 ​ ​ 6 Total Nonaccrual Loans and Leases ​ $ 1,211 ​ $ 1,049 ​ $ 2,260 ​ $ 2,301 ​ All payment received while on nonaccrual status are applied against the principal balance of the loan. ​ 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 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 amortized cost basis of collateral-dependent loans, excluding accrued interest receivable, was at December 31, 2023 and 2022, respectively. These loans were collateralized by residential real estate in Hawaii. As of December 31, 2023 and 2022, the fair value of the collateral less selling costs of these collateral-dependent loans exceeded the amortized cost basis. There was no ACL on collateral-dependent loans. ​ In August 2023, wildfires on Maui partially or completely destroyed 12 homes which were collateral for $3.2 million of mortage loans held by the Company. Since the wildfire occurred, of these loans have been paid off using insurance proceeds. At December 31, 2023, the Company had million of mortgage loans which were collateralized by homes partially or completely destroyed in the Maui wildfires and all of these loans were current. A mortgage loan, which was collateralized by a home destroyed in the Maui wildfire, is in the Bank’s forbearance program which was designed to assit borrowers experiencing financial dificulties. The forbearance program allows the borrower to defer his interest payments for six months. All of the homes which were destroyed are insured and the Company does not expect to incur a loss on these loans. The Company also has million of mortgage loans on Maui at December 31, 2023 which were not affected by the wildfires. As of December 31, 2023, all of these loans were current. The loan in the forbearance program was the only loan modifed in the year ended December 31, 2023. There were no loans modified during the year ended December 31, 2022. ​ The Company had no real estate owned as of December 31, 2023 or 2022. There were ​ Nearly all the Company’s 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 ​ During the years ended December 31, 2023 and 2022, the Company sold mortgage loans held for sale with principal balances of $827,000 and $5.4 million, respectively, and recognized a gain of $10,000 and a loss of $3,000 , respectively. The Company had ​ The Company serviced loans for others with principal balances of $33.2 million and $36.0 million at December 31, 2023 and 2022, respectively. Of these amounts, million of loan balances relate to securitizations for which the Company continues to hold the related mortgage-backed securities at December 31, 2023 and 2022, respectively. The amount of contractually specified servicing fees for 2023 and 2022, respectively. The fees are reported in service and other fees 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

Accrued Interest Receivable

Accrued Interest Receivable	12 Months Ended
	Dec. 31, 2023
Accrued Interest Receivable
Accrued Interest Receivable	(8) Accrued Interest Receivable ​ The components of accrued interest receivable are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Loans receivable ​ $ 4,585 ​ $ 4,595 ​ Investment securities ​ ​ 1,441 ​ ​ 1,497 ​ Interest-bearing deposits ​ 79 ​ 23 ​ Total ​ $ 6,105 ​ $ 6,115 ​ ​

Interest Rate Lock and Forward

Interest Rate Lock and Forward Loan Sale Commitments	12 Months Ended
	Dec. 31, 2023
Interest Rate Lock and Forward Loan Sale Commitments
Interest Rate Lock and Forward Loan Sale Commitments	(9) 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. The Company did not have any loans available for sale at December 31, 2023 or 2022. ​ There were no interest rate contracts at December 31, 2023 or 2022. There were no gains and losses on derivatives for the year ended December 31, 2023. Gains and losses on derivatives net to

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2023
Premises and Equipment
Premises and Equipment	(10) Premises and Equipment ​ Premises and equipment are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Land ​ $ 585 ​ $ 585 ​ Buildings and improvements ​ 1,400 ​ 1,400 ​ Leasehold improvements ​ 18,053 ​ 17,949 ​ Furniture, fixtures and equipment ​ 6,613 ​ 6,766 ​ Automobiles ​ 96 ​ 130 ​ ​ ​ 26,747 ​ 26,830 ​ Less accumulated depreciation and amortization ​ (19,783) ​ (19,494) ​ ​ ​ 6,964 ​ 7,336 ​ Construction in progress ​ 221 ​ 263 ​ Total ​ $ 7,185 ​ $ 7,599 ​ ​ Depreciation expense was $1.1 million and $1.2 million for the years ended December 31, 2023 and 2022, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits
Deposits	(11) Deposits ​ Deposit accounts by type are summarized with their respective weighted-average interest rates as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 (Dollars in thousands) Amount Rate Amount Rate Non-interest bearing ​ $ 66,757 — % $ 68,095 — % Savings accounts ​ 739,036 0.59 ​ 910,652 0.13 ​ Certificates of deposit ​ 532,433 4.11 ​ 429,687 2.67 ​ Money market ​ 3,595 0.10 ​ 5,372 0.10 ​ Checking and Super NOW ​ 294,783 0.02 ​ 302,346 0.02 ​ Total ​ $ 1,636,604 1.61 % $ 1,716,152 0.74 % ​ ​ ​ ​ ​ ​ ​ Maturing in: ​ ​ Due within 1 year ​ $ 498,140 ​ Due after 1year through 2 years ​ 20,142 ​ Due after 2 years through 3 years ​ 5,746 ​ Due after 3 years through 4 years ​ 3,743 ​ Due after 4 years through 5 years ​ 4,662 ​ Total ​ $ 532,433 ​ ​ Certificates of deposit with balances greater than or equal to $250,000 totaled $280.1 million and $257.9 million at December 31, 2023 and 2022, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, (Dollars in thousands) ​ 2023 ​ ​ 2022 ​ Savings ​ $ 2,469 ​ $ 949 ​ Certificates of deposit and money market ​ 16,956 ​ 3,914 ​ Checking and Super NOW ​ 59 ​ 62 ​ Total ​ $ 19,484 ​ $ 4,925 ​ ​ At December 31, 2023 and 2022, overdrawn deposit accounts totaled $169,000 and $35,000, respectively, and have been reclassified as loans in the Consolidated Balance Sheets. ​ In the normal course of business, certain directors and executive officers (and their associated and affiliated parties) maintain deposit accounts with the Company totaling $4.5 million and $3.9 million at December 31, 2023 and 2022, respectively.

Advances from the Federal Home

Advances from the Federal Home Loan Bank	12 Months Ended
	Dec. 31, 2023
Advances from the Federal Home Loan Bank
Advances from the Federal Home Loan Bank	(12) Advances from the Federal Home Loan Bank ​ Federal Home Loan Bank advances are secured by a blanket pledge on the Bank’s assets not otherwise pledged. At December 31, 2023 and 2022, our credit line with the FHLB Des Moines was equal to 45% of the Bank’s total assets and we had the capacity to borrow an additional $612.6 million and $769.1 million, respectively. ​ Advances outstanding consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2023 ​ 2022 ​ ​ ​ Weighted ​ ​ Weighted ​ ​ ​ Average ​ ​ ​ ​ Average ​ (Dollars in thousands) Amount ​ Rate ​ Amount ​ Rate ​ Due within one year ​ $ 82,000 1.40 % $ 24,000 1.27 % Due over 1 year to 2 years ​ ​ 45,000 2.87 ​ ​ 82,000 1.40 ​ Due over 2 years to 3 years ​ 20,000 3.20 ​ 25,000 1.58 ​ Due over 3 years to 4 years ​ ​ 30,000 4.24 ​ 10,000 1.97 ​ Due over 4 years to 5 years ​ ​ 60,000 ​ 4.32 ​ ​ — ​ — ​ Due over 5 years to 6 years ​ 5,000 4.38 ​ — — ​ Total ​ $ 242,000 2.96 % $ 141,000 1.45 % ​

Advances from the Federal Reser

Advances from the Federal Reserve Bank	12 Months Ended
	Dec. 31, 2023
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Federal Reserve Bank Advances, Disclosure [Text Block]	(13 ) Advances from the Federal Reserve Bank ​ Advances can be requested under the BTFP until at least March 11, 2024. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Weighted ​ ​ ​ Average ​ (Dollars in thousands) Amount ​ Rate ​ Due within one year ​ $ 50,000 4.89 % Total ​ $ 50,000 ​ 4.89 % ​

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2023
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 securities collateralizing the agreements classified as an asset. Securities sold under agreements to repurchase are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ Weighted ​ Weighted ​ Repurchase Average ​ Repurchase Average ​ (Dollars in thousands) Liability Rate Liability Rate ​ Maturing: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 year or less ​ $ 5,000 1.88 % ​ $ — — % ​ Over 1 year to 2 years ​ ​ 5,000 ​ 1.73 ​ ​ ​ 5,000 ​ 1.81 ​ ​ Over 2 years to 3 years ​ — — ​ ​ ​ 5,000 1.73 ​ ​ Total ​ $ 10,000 1.81 % ​ $ 10,000 1.81 % ​ ​ 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, 2023. The amount at risk is the greater of the carrying value or fair value over the repurchase liability and refers to the potential loss to the Company if the secured lender fails to return the security at the maturity date of the agreement. All the agreements to repurchase are with JP Morgan Securities and the securities pledged are mortgage-backed securities issued and guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. The fair value of the securities pledged must exceed the repurchase liability by 5.00%. In the event of a decline in the fair value of securities pledged to less than the required amount due to market conditions or principal repayments, the Company is obligated to pledge additional securities or other suitable collateral to cure the deficiency. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ 14,230 ​ $ 12,239 ​ $ 10,000 ​ $ 4,230 12 ​ ​

Offsetting of Financial Liabili

Offsetting of Financial Liabilities	12 Months Ended
	Dec. 31, 2023
Offsetting of Financial Liabilities
Offsetting of Financial Liabilities	(15) Offsetting of Financial Liabilities ​ Securities sold under agreements to repurchase are subject to a right of offset in the event of default. See Note 14, Securities Sold Under Agreements to Repurchase, for additional information. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Amount of Gross Amount Not Offset in the Gross Amount Gross Amount Liabilities Balance Sheet of Recognized Offset in the Presented in the Financial Cash Collateral (Dollars in thousands) Liabilities Balance Sheet Balance Sheet Instruments ​ Pledged Net Amount December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities sold under agreements to repurchase ​ $ 10,000 ​ $ — ​ $ 10,000 ​ $ 10,000 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities sold under agreements to repurchase ​ $ 10,000 ​ $ — ​ $ 10,000 ​ $ 10,000 ​ $ — ​ $ — ​

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
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) 2023 2022 Current ​ ​ ​ ​ ​ ​ ​ Federal ​ $ 1,767 ​ $ 2,911 ​ State ​ 568 ​ 1,317 ​ ​ ​ 2,335 ​ 4,228 ​ Deferred ​ ​ ​ ​ ​ ​ ​ Federal ​ (396) ​ 990 ​ State ​ (129) ​ 100 ​ ​ ​ (525) ​ 1,090 ​ Total ​ $ 1,810 ​ $ 5,318 ​ ​ The federal statutory corporate tax rate for the years ended December 31, 2023 and 2022 was 21% . 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) 2023 2022 ​ Income tax expense at statutory rate ​ $ 1,436 ​ $ 4,510 ​ Income tax effect of: ​ ​ ​ ​ ​ ​ ​ State income taxes, net of federal income tax benefits ​ 628 ​ 1,079 ​ Other tax-exempt income ​ (179) ​ (166) ​ Share-based compensation ​ 12 ​ 9 ​ Meal and entertainment expenses ​ ​ 53 ​ ​ 49 ​ Non-deductible executive compensation ​ ​ 70 ​ ​ 119 ​ Recovery on bank-owned life insurance ​ ​ — ​ ​ (216) ​ Other ​ (210) ​ (66) ​ Total income tax expense ​ $ 1,810 ​ $ 5,318 ​ Effective income tax rate ​ 26.47 % 24.76 % ​ The components of income taxes payable (receivable) are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Current taxes (receivable) payable: ​ ​ ​ ​ ​ ​ ​ Federal ​ $ (932) ​ $ (519) ​ State ​ 588 ​ 1,357 ​ ​ ​ $ (344) ​ $ 838 ​ Deferred taxes receivable: ​ ​ ​ ​ ​ ​ ​ Federal ​ $ (1,313) ​ $ (707) ​ State ​ (1,144) ​ (936) ​ ​ ​ $ (2,457) ​ $ (1,643) ​ ​ 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) 2023 2022 Deferred tax assets: ​ ​ ​ ​ ​ ​ ​ Hawaii franchise tax ​ $ 117 ​ $ 377 ​ Allowance for credit/loan losses ​ 1,364 ​ 541 ​ Employee benefit plans ​ 2,672 ​ 2,714 ​ Equity incentive plan ​ 107 ​ 141 ​ Deferred compensation ​ 22 ​ 199 ​ Net lease liability ​ ​ 1,312 ​ ​ 212 ​ Unrealized loss on securities available for sale ​ ​ 637 ​ ​ 725 ​ Other ​ 11 ​ 16 ​ ​ ​ 6,242 ​ 4,925 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Deferred loan costs ​ 2,665 ​ 2,601 ​ Premises and equipment ​ ​ 273 ​ ​ 254 ​ FHLB stock dividends ​ 126 ​ 125 ​ Prepaid expense ​ 653 ​ 226 ​ Premiums on loans sold ​ 68 ​ 76 ​ ​ ​ 3,785 ​ 3,282 ​ Net deferred tax assets ​ $ 2,457 ​ $ 1,643 ​ ​ Deferred tax assets and liabilities at December 31, 2023 and 2022 were calculated using federal corporate tax rates of 21% . ​ 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

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2023
Employee Benefit Plans
Employee Benefit Plans	(17) Employee Benefit Plans ​ The Company has a noncontributory defined benefit pension plan (Pension Plan) that covers certain employees with at least one year of service. 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 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. ​ In 2008, the Board of Directors approved changes to the Company’s Pension Plan. Effective December 31, 2008, there are no further accruals of benefits for any participants and benefits do not increase with any additional years of service. Employees already enrolled in the Pension Plan as of December 31, 2008 will be ​ 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) 2023 2022 2023 2022 Accumulated benefit obligation at end of year ​ $ 15,953 ​ $ 15,865 ​ $ 9,927 ​ $ 9,947 ​ Change in projected benefit obligation: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation at beginning of year ​ $ 15,866 ​ $ 20,943 ​ $ 9,948 ​ $ 9,915 ​ Service cost (income) ​ 191 ​ 118 ​ (200) ​ (135) ​ Interest cost ​ 822 ​ 597 ​ 179 ​ 179 ​ Actuarial loss (gain) ​ 94 ​ (4,802) ​ — ​ — ​ Benefits paid ​ (1,020) ​ (990) ​ — ​ (11) ​ Benefit obligation at end of year ​ 15,953 ​ 15,866 ​ 9,927 ​ 9,948 ​ Change in plan assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value of plan assets at beginning of year ​ 18,336 ​ 23,125 ​ — ​ — ​ Actual return on plan assets ​ 2,789 ​ (3,799) ​ — ​ — ​ Employer contributions ​ — ​ — ​ — ​ 11 ​ Benefits paid ​ (1,020) ​ (990) ​ — ​ (11) ​ Fair value of plan assets at end of year ​ 20,105 ​ 18,336 ​ — ​ — ​ Funded status at end of year ​ $ 4,152 ​ $ 2,470 ​ $ (9,927) ​ $ (9,948) ​ Amounts recognized in the Consolidated Balance Sheets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prepaid expenses and other assets (Accounts payable and accrued expenses) ​ $ 4,152 ​ $ 2,470 ​ $ (9,927) ​ $ (9,948) ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net actuarial loss ​ $ 5,968 ​ $ 7,708 ​ $ — ​ $ — ​ Prior service cost ​ 119 ​ 124 ​ — ​ — ​ Accumulated other comprehensive loss, before tax ​ $ 6,087 ​ $ 7,832 ​ $ — ​ $ — ​ ​ The accumulated benefit obligation experienced an actuarial loss of $95,000 in 2023 and an actuarial gain of $4.8 million in 2022. The actuarial loss in 2023 was attributed to a decline in the discount rate used to calculate the benefit obligation. The actuarial gain in 2022 was attributed to an increase in the discount rate used to calculate the benefit obligation. ​ 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) 2023 2022 Accumulated other comprehensive loss at beginning of year, before tax ​ $ 7,832 ​ $ 7,530 ​ Actuarial net (gain) loss arising during the period ​ (1,503) ​ 517 ​ Amortizations (recognized in net periodic benefit cost): ​ ​ ​ ​ ​ ​ ​ Actuarial loss ​ (237) ​ (210) ​ Prior service cost ​ (5) ​ (5) ​ Total recognized in other comprehensive loss ​ (1,745) ​ 302 ​ Accumulated other comprehensive loss at end of year, before tax ​ $ 6,087 ​ $ 7,832 ​ ​ For the years ended December 31, 2023 and 2022, the following weighted average assumptions were used to determine benefit obligations at the end of the year: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan ​ SERP ​ ​ Year Ended December 31, ​ 2023 2022 2023 2022 Assumptions used to determine the year-end benefit obligations: ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 5.10 % 5.40 % 5.00 % 5.00 % Rate of compensation increase N/A ​ N/A ​ 5.00 % 5.00 % ​ The dates used to determine retirement measurements for the Pension Plan were December 31, 2023 and 2022. ​ The Company’s investment strategy for the Pension 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, 2023 were 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, 2023 and 2022, the Pension Plan’s assets measured at fair value were classified as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value of Measurements at Report Date Using: ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ in Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Total Fair ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Value ​ (Level 1) ​ (Level 2) ​ (Level 3) December 31, 2023: ​ ​ ​ ​ ​ Cash ​ $ 622 ​ $ 622 ​ $ — ​ $ — ​ Equities ​ 13,742 ​ 13,742 ​ — ​ — ​ Mutual funds (1) ​ 5,741 ​ 5,741 ​ — ​ — ​ Total ​ $ 20,105 ​ $ 20,105 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 1,452 ​ $ 1,452 ​ $ — ​ $ — ​ Equities ​ 11,659 ​ 11,659 ​ — ​ — ​ Mutual funds (1) ​ 5,225 ​ 5,225 ​ — ​ — ​ Total ​ $ 18,336 ​ $ 18,336 ​ $ — ​ $ — ​ (1) 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, 2023 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension ​ ​ (Dollars in thousands) ​ Plan ​ SERP 2024 ​ $ 1,001 ​ $ 319 ​ 2025 ​ 1,122 ​ 8,696 ​ 2026 ​ 1,195 ​ 95 ​ 2027 ​ 1,216 ​ 95 ​ 2028 ​ 1,224 ​ 95 ​ 2029 - 2033 ​ 6,017 ​ 473 ​ Total ​ $ 11,775 ​ $ 9,773 ​ ​ For the years ended December 31, 2023 and 2022, 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, ​ 2023 2022 2023 2022 Assumptions used to determine the net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 5.40 % 2.90 % 5.00 % 5.00 % Expected return on plan assets 6.75 ​ 6.75 ​ — ​ — ​ Rate of compensation increase N/A ​ N/A ​ 5.00 ​ 5.00 ​ ​ The components of net periodic benefit cost were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan SERP ​ ​ Year Ended December 31, ​ (Dollars in thousands) 2023 2022 2023 2022 Net periodic benefit (income) cost for the year: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost (income) ​ $ 191 ​ $ 118 ​ $ (200) ​ $ (135) ​ Interest cost ​ 822 ​ 597 ​ 179 ​ 179 ​ Expected return on plan assets ​ (1,192) ​ (1,520) ​ — ​ — ​ Amortization of prior service cost ​ 5 ​ 5 ​ — ​ — ​ Recognized actuarial loss ​ 237 ​ 210 ​ — ​ — ​ Recognized curtailment loss ​ — ​ — ​ — ​ — ​ Net periodic benefit (income) cost for the year: ​ $ 63 ​ $ (590) ​ $ (21) ​ $ 44 ​ ​ The service cost component of net periodic benefit cost is included in salaries and employee benefits in the Consolidated Statements of Income. The other components of net periodic benefit cost including interest cost, the return on plan assets and amortization of net loss are reported in other income. ​ 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. ​ The Company does not expect to make any contributions to the Pension Plan or the SERP in 2024. ​ 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 are based on of employees’ contributions. The Company’s contributions amounted to each for the years 2023 and 2022. Matching contributions. The Company contributes to the profit sharing plan an amount determined by the Board of Directors.

Employee Stock Ownership Plan

Employee Stock Ownership Plan	12 Months Ended
	Dec. 31, 2023
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 , of the total number of shares issued by the Company in its initial public offering. The shares were acquired at a price of ​ 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 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, 2023 and 2022 amounted to ​ Shares held by the ESOP trust were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, 2023 2022 Allocated shares ​ 619,938 ​ 583,474 ​ ​ Unearned shares ​ 244,665 ​ 293,598 ​ ​ Total ESOP shares ​ 864,603 ​ 877,072 ​ ​ Fair value of unearned shares, in thousands ​ $ 2,728 ​ $ 7,049 ​ ​ ​ 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 ESOP’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, 2023 and 2022, we accrued

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2023
2010 and 2019 Equity Incentive Plans
Share-Based Compensation
Share-Based Compensation	(19) Share-Based Compensation ​ The shareholders of Territorial Bancorp Inc. adopted the 2010 Equity Incentive Plan and the 2019 Equity Incentive Plan. These plans provide for the award of stock options and restricted stock to key officers and directors. In accordance with the Compensation — Stock Compensation topic of the FASB ASC, the cost of the equity incentive plans is based on the fair value of the awards on the grant date. The fair value of time-based restricted stock is based on the closing price of the Company’s stock on the grant date. The fair value of performance-based stock that will vest based on a performance condition is based on the closing price of the Company’s stock on the date of grant. The fair value of performance-based restricted stock that will vest on a market condition is based on a Monte Carlo valuation of the Company’s stock on the date of grant. The cost of the awards will be recognized on a straight-line basis over the three -year vesting period during which participants are required to provide services in exchange for the awards. There are ​ 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 Consolidated Statements 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) 2023 2022 Compensation expense ​ $ 177 ​ $ 480 ​ Income tax benefit ​ 48 ​ 131 ​ ​ Restricted Stock ​ Restricted stock awards are accounted for as a fixed grant using the fair value of the Company’s stock at the time of grant. Unvested restricted stock may not be disposed of or transferred during the vesting period. Restricted stock carries the right to receive dividends, although dividends attributable to restricted stock may be retained by the Company until the shares vest, at which time they are paid to the award recipient. Unvested restricted stock that is time-based contain nonforfeitable dividend rights. Accrued dividends on restricted stock that do not vest based on performance or market conditions are forfeited. ​ The table below presents the time-based restricted stock activity: ​ ​ ​ ​ ​ ​ ​ ​ Weighted Average Grant Restricted Date Fair Stock Value Unvested at December 31, 2021 ​ 23,208 ​ $ 24.61 ​ Granted 12,013 ​ 23.77 ​ Vested 11,557 ​ 24.68 ​ Forfeited — ​ — ​ Unvested at December 31, 2022 23,664 ​ $ 24.15 ​ Granted 14,803 ​ 19.29 ​ Vested 12,729 ​ 23.64 ​ Forfeited — ​ — ​ Unvested at December 31, 2023 25,738 ​ $ 21.61 ​ ​ During the year ended December 31, 2023, the Company issued 14,803 shares of time-vested restricted stock to certain members of executive management under the 2019 Equity Incentive Plan. The fair value of the restricted stock is based on the value of the Company’s stock on the date of grant. Time-vested restricted stock will vest over ​ As of December 31, 2023, the Company had $359,000 of unrecognized compensation costs related to time-vested restricted stock. The unrecognized compensation costs are expected to be recognized over a weighted average period of ​ The table below presents the performance-based restricted stock units (PRSUs) that will vest on a performance condition: ​ ​ ​ ​ ​ ​ ​ Performance- ​ ​ ​ ​ Based Restricted ​ ​ ​ Stock Units Weighted ​ ​ Based on a ​ Average Grant ​ ​ Performance ​ Date Fair Condition Value Unvested at December 31, 2021 41,583 ​ $ 24.68 Granted 14,412 ​ 23.77 Vested 7,670 ​ 27.30 Forfeited 4,768 ​ 27.30 Unvested at December 31, 2022 43,557 ​ $ 23.63 Granted 17,758 ​ 19.29 Vested — ​ — Forfeited 16,348 ​ 21.05 Unvested at December 31, 2023 44,967 ​ $ 22.85 ​ During the year ended December 31, 2023, the Company issued 17,758 PRSUs to certain members of executive management under the 2019 Equity Incentive Plan. These PRSUs will vest on average equity to the SNL Bank Index is achieved. Depending on the Company’s performance, the actual number of these PRSUs that are issued at the end of the vesting period can vary between of the target award. For the PRSUs, an estimate is made of the number of shares expected to vest based on the probability that the performance criteria will be achieved to determine the amount of compensation expense to be recognized. This estimate is re-evaluated quarterly and total compensation expense is adjusted for any change in the current period. ​ The fair value of these PRSUs is based on the fair value of the Company’s stock on the date of grant. As of December 31, 2023, the Company had no unrecognized compensation costs related to these PRSUs since meeting the performance condition is not probable. Compensation expense up to may be recognized in the future if achievement of the performance condition becomes probable. The unrecognized compensation costs would be expected to be recognized over a weighted average period of years. Performance will be measured over a period and will be cliff vested. The performance condition is measured quarterly by comparing the company’s three-year return on average equity to a peer group of banks. The Company’s percentile ranking in the peer group is used to adjust the number of PRSU’s that are expected to vest. ​ The table below presents the PRSUs that will vest on a market condition: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance- ​ ​ ​ ​ ​ Based Restricted ​ Monte Carlo ​ ​ Stock Units ​ Valuation of ​ ​ Based on a ​ the Company's Market Condition Stock Unvested at December 31, 2021 10,396 ​ $ 24.03 Granted 3,603 ​ 24.42 Vested ​ ​ — Forfeited 3,110 ​ 24.45 Unvested at December 31, 2022 10,889 ​ $ 24.04 Granted 4,443 ​ 17.95 Vested — ​ — Forfeited 4,087 ​ 22.16 Unvested at December 31, 2023 11,245 ​ $ 22.31 ​ During the year ended December 31, 2023, the Company issued 4,443 of PRSUs to certain members of executive management under the 2019 Equity Incentive Plan. These PRSUs will vest after they are granted after our Compensation Committee determines whether a market condition that compares the Company’s total stock return to the SNL Bank Index is achieved. The number of shares that will be expensed will not be adjusted for performance and will be cliff vested. The market condition is measured quarterly by comparing the Company’s three-year average total stock return to a peer group of other banks. The Company’s percentile ranking in the peer group determines how many PRSUs will vest. The fair value of these PRSUs is based on a Monte Carlo valuation of the Company’s stock on the date of grant. The assumptions which were used in the Monte Carlo valuation of the PRSUs are: ​ Grant date: April 3, 2023 Performance period: January 1, 2023 to December 31, 2025 2.75 year risk-free rate on grant date: 3.79% December 31, 2022 closing price: $24.01 Closing stock price on date of grant: $19.29 Annualized volatility (based on 2.75 year historical volatility as of the grant date): 26.1% ​ As of December 31, 2023, the Company had $60,000 of unrecognized compensation costs related to the PRSUs that are based on a market condition. The unrecognized compensation costs are expected to be recognized over a weighted average period of years.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
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) 2023 2022 Net income ​ $ 5,027 ​ $ 16,156 ​ Income allocated to participating securities ​ ​ (48) ​ ​ (98) ​ Net income available to common shareholders ​ $ 4,979 ​ $ 16,058 ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average number of shares used in: ​ ​ ​ ​ ​ ​ ​ Basic earnings per share ​ 8,636,495 ​ 8,865,946 ​ Dilutive common stock equivalents: ​ ​ ​ ​ ​ ​ ​ Stock options and restricted stock units ​ 47,597 ​ 54,768 ​ Diluted earnings per share ​ 8,684,092 ​ 8,920,714 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income per common share, basic ​ $ 0.58 ​ $ 1.81 ​ Net income per common share, diluted ​ $ 0.57 ​ $ 1.80 ​ ​

Other Comprehensive Loss

Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss	(21) Other Comprehensive Income (Loss) ​ The table below presents the changes in the components of accumulated other comprehensive loss, net of taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unfunded Unrealized Pension Loss on (Dollars in thousands) Liability Securities Total December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at beginning of year ​ $ 5,746 ​ $ 1,998 ​ $ 7,744 ​ Other comprehensive income, net of taxes ​ (1,280) ​ (243) ​ (1,523) ​ Net current period other comprehensive income ​ (1,280) ​ (243) ​ (1,523) ​ Balances at end of year ​ $ 4,466 ​ $ 1,755 ​ $ 6,221 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at beginning of year ​ $ 5,524 ​ $ — ​ $ 5,524 ​ Other comprehensive loss, net of taxes ​ 222 ​ 1,998 ​ 2,220 ​ Net current period other comprehensive loss ​ 222 ​ 1,998 ​ 2,220 ​ Balances at end of year ​ $ 5,746 ​ $ 1,998 ​ $ 7,744 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The table below presents the tax effect on each component of other comprehensive income and loss: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2023 ​ 2022 Pretax ​ ​ After Tax Pretax ​ ​ After Tax (Dollars in thousands) Amount ​ Tax ​ Amount ​ Amount ​ Tax ​ Amount Unfunded pension liability ​ $ (1,745) ​ $ 465 ​ $ (1,280) ​ $ 302 ​ $ (80) ​ $ 222 ​ Unrealized loss on securities ​ (331) ​ 88 ​ (243) ​ 2,723 ​ (725) ​ 1,998 ​ Total ​ $ (2,076) ​ $ 553 ​ $ (1,523) ​ $ 3,025 ​ $ (805) ​ $ 2,220 ​ ​

Commitments

Commitments	12 Months Ended
	Dec. 31, 2023
Commitments
Commitments	(22) 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, 2023 and 2022, the Company had loan commitments aggregating to ), respectively, primarily consisting of fixed-rate residential first mortgage loans. In addition to commitments to originate loans, at December 31, 2023 and 2022, the Company had ​ The Company is required by the Federal Reserve Bank to maintain reserves based on the amount of deposits held. Effective March 25, 2020 the Federal Reserve Bank lowered the reserve requirement to zero percent, therefore, there were

Regulatory Capital and Supervis

Regulatory Capital and Supervision	12 Months Ended
	Dec. 31, 2023
Regulatory Capital and Supervision
Regulatory Capital and Supervision	(23) Regulatory Capital and Supervision ​ Territorial Savings Bank and the Company are subject to various regulatory capital requirements, including a risk-based capital measure. The risk-based capital guidelines include both a definition of capital and a framework for calculating risk-weighted assets by assigning balance sheet assets and off-balance sheet items to broad risk categories. The Company is not subject to regulatory capital requirements because its total assets are less than billion. At December 31, 2023 and 2022, Territorial Savings Bank exceeded all of the fully-phased in regulatory captial requirments and is considered to be “well capitalized” under regulatory guidelines. In addition to establishing the minimum regulatory capital requirements, the regulations limit capital distributions and certain discretionary bonus payments to management if the institution does not hold a “capital conservation buffer” consisting of 2.5% of common equity Tier 1 capital to risk-weighted assets above the amount necessary to meet its minimum risk-based capital requirements. The tables below presents the fully-phased in capital required to be considered “well-capitalized” and meet the regulatory capital conservation buffer requirement as a percentage of total and risk-weighted assets and the percentage and the total amount of capital maintained for Territorial Savings Bank and the Company at December 31, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) Required Ratio Actual Amount Actual Ratio December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Leverage Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 5.00 % ​ $ 238,972 ​ 10.86 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 11.69 % Common Equity Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 9.00 % ​ $ 238,972 ​ 26.31 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 28.33 % Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 10.50 % ​ $ 238,972 ​ 26.31 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 28.33 % Total Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 12.50 % ​ $ 244,093 ​ 26.87 % Territorial Bancorp Inc. ​ ​ ​ $ 262,428 ​ 28.89 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Leverage Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 5.00 % ​ $ 235,408 ​ 10.87 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 12.21 % Common Equity Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 9.00 % ​ $ 235,408 ​ 25.98 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 29.16 % Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 10.50 % ​ $ 235,408 ​ 25.98 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 29.16 % Total Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 12.50 % ​ $ 237,488 ​ 26.20 % Territorial Bancorp Inc. ​ ​ ​ $ 266,375 ​ 29.39 % (1) The required Common Equity Tier 1 Risk-Based Capital, Tier 1 Risk-Based Capital, and Total Risk-Based Capital ratios are based on the fully-phased in capital ratios in the Basel III capital regulations plus the 2.50% capital conservation buffer. ​ 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. ​ 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, 2023 and 2022, the Bank’s capital ratios exceeded the minimum capital thresholds for a “well-capitalized” institution. There are ​ 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 Company. ​ Legislation enacted in 2018 requires the federal banking agencies, including the Federal Reserve Board, to establish a “community bank leverage ratio” between 8% to 10% of average total consolidated assets for qualifying institutions with assets of less than $10 billion. Institutions with capital meeting the specified requirements and electing to follow the alternative framework would be deemed to comply with the applicable regulatory capital requirements, including the risk based requirements. The federal regulators have adopted 9% as the applicable ratio. We have not elected to follow the alternative framework.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2023
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. ​

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2023
Revenue Recognition
Revenue Recognition	(25) Revenue Recognition ​ The Company’s contracts with customers are generally short-term in nature, with cycles of one year or less. These can range from an immediate term for services such as wire transfers, foreign currency exchanges, and cashier’s check purchases, to several days for services such as processing annuity and mutual fund sales. Some contracts may be of an ongoing nature, such as providing deposit account services, including ATM access, check processing, account analysis and check ordering. However, provision of an assessable service and payment for such service is usually concurrent or closely timed. Contracts related to financial instruments, such as loans, investments, and debt, are excluded from the scope of this accounting requirement. ​ After analyzing the Company’s revenue sources, including the amount of revenue received, the timing of services rendered and the timing of payment for these services, the Company has determined that the rendering of services and the payment for such services are generally closely matched. Any differences are not material to the Company’s Consolidated Financial Statements. Accordingly, the Company generally records income when payment for services is received. ​ Revenue from contracts with customers is reported in service and other fees and in other noninterest income in the Consolidated Statements of Income. The table below reconciles the revenue from contracts with customers and other revenue reported in those line items: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service and ​ ​ ​ ​ (Dollars in thousands) Other Fees Other Total Year ended December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue from contracts with customers ​ $ 1,186 ​ $ 122 ​ $ 1,308 Other revenue ​ ​ 141 ​ ​ 157 ​ ​ 298 Total ​ $ 1,327 ​ $ 279 ​ $ 1,606 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue from contracts with customers ​ $ 1,276 ​ $ 221 ​ $ 1,497 Other revenue ​ ​ 140 ​ ​ 1,783 ​ ​ 1,923 Total ​ $ 1,416 ​ $ 2,004 ​ $ 3,420 ​

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases
Leases	(26) Leases ​ The table below presents lease costs and other information for the years indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 31, (Dollars in thousands) 2023 2022 Lease costs: ​ ​ ​ ​ ​ ​ ​ Operating lease costs ​ $ 2,757 ​ $ 2,991 ​ Short-term lease costs ​ 511 ​ 296 ​ Variable lease costs ​ 163 ​ 165 ​ Total lease costs ​ $ 3,431 ​ $ 3,452 ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in measurement of lease liabilities ​ $ (991) ​ $ 3,193 ​ ROU assets obtained in exchange for new operating lease liabilities ​ $ 693 ​ $ 7,462 ​ ​ At December 31, 2023, future minimum rental commitments under noncancellable operating leases are as follows: ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2024 ​ $ 2,818 2025 ​ 2,199 2026 ​ 2,038 2027 ​ 1,961 2028 ​ 1,729 Thereafter ​ 9,299 Total ​ ​ 20,044 ​ ​ ​ ​ Less lease incentives to be received in 2024 ​ ​ (729) Less present value discount ​ ​ (2,018) Present value of leases ​ $ 17,297 ​ The table below presents other lease related information: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ December 31, ​ ​ ​ 2023 ​ 2022 ​ Weighted-average remaining lease term (years) ​ 9.77 ​ ​ 8.88 ​ ​ Weighted-average discount rate ​ ​ 2.15 % ​ ​ 2.03 % ​ ​ The Company leased to a tenant certain property that it owns under a non-cancelable lease that expires on December 31, 2031. Rental income comprised of minimum rentals for 2023 and 2022 was

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2023
Fair Value
Fair Value	(27) 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 measured or disclosed 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 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 available 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. ​ Investment Securities Available for Sale. ​ 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. The fair value inputs are considered Level 2 inputs. 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, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 126,659 ​ $ 126,659 ​ $ 126,659 ​ $ — ​ $ — ​ Investment securities available for sale ​ ​ 20,171 ​ ​ 20,171 ​ ​ — ​ ​ 20,171 ​ ​ — ​ Investment securities held to maturity ​ 685,728 ​ ​ 568,128 ​ ​ — ​ ​ 568,128 ​ ​ — ​ Loans receivable, net ​ 1,303,431 ​ ​ 1,120,704 ​ ​ — ​ ​ — ​ ​ 1,120,704 ​ FHLB stock ​ 12,192 ​ ​ 12,192 ​ ​ — ​ ​ 12,192 ​ ​ — ​ FRB stock ​ ​ 3,180 ​ ​ 3,180 ​ ​ — ​ ​ 3,180 ​ ​ — ​ Accrued interest receivable ​ 6,105 ​ ​ 6,105 ​ ​ 79 ​ ​ 1,441 ​ ​ 4,585 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 1,636,604 ​ ​ 1,633,164 ​ ​ — ​ ​ 1,104,171 ​ ​ 528,993 ​ Advances from the Federal Home Loan Bank ​ 242,000 ​ ​ 238,380 ​ ​ — ​ ​ 238,380 ​ ​ — ​ Advances from the Federal Reserve Bank ​ ​ 50,000 ​ ​ 50,049 ​ ​ ​ ​ ​ 50,049 ​ ​ — ​ Securities sold under agreements to repurchase ​ 10,000 ​ ​ 9,700 ​ ​ — ​ ​ 9,700 ​ ​ — ​ Accrued interest payable ​ 1,183 ​ ​ 1,183 ​ ​ — ​ ​ 157 ​ ​ 1,026 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 40,553 ​ $ 40,553 ​ $ 40,553 ​ $ — ​ $ — ​ Investment securities available for sale ​ ​ 20,821 ​ ​ 20,821 ​ ​ — ​ ​ 20,821 ​ ​ — ​ Investment securities held to maturity ​ 717,773 ​ ​ 591,084 ​ ​ — ​ ​ 591,084 ​ ​ — ​ Loans receivable, net ​ 1,294,764 ​ ​ 1,180,840 ​ ​ — ​ ​ — ​ ​ 1,180,840 ​ FHLB stock ​ 8,197 ​ ​ 8,197 ​ ​ — ​ ​ 8,197 ​ ​ — ​ FRB stock ​ ​ 3,170 ​ ​ 3,170 ​ ​ — ​ ​ 3,170 ​ ​ — ​ Accrued interest receivable ​ 6,115 ​ ​ 6,115 ​ ​ 23 ​ ​ 1,497 ​ ​ 4,595 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 1,716,152 ​ ​ 1,708,612 ​ ​ — ​ ​ 1,286,465 ​ ​ 422,147 ​ Advances from the Federal Home Loan Bank ​ 141,000 ​ ​ 133,145 ​ ​ — ​ ​ 133,145 ​ ​ — ​ Securities sold under agreements to repurchase ​ 10,000 ​ ​ 9,440 ​ ​ — ​ ​ 9,440 ​ ​ — ​ Accrued interest payable ​ 701 ​ ​ 701 ​ ​ — ​ ​ 33 ​ ​ 668 ​ ​ At December 31, 2023 and 2022, 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, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available for sale ​ $ — ​ $ 20,171 ​ $ — ​ $ 20,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available for sale ​ $ — ​ $ 20,821 ​ $ — ​ $ 20,821 ​ ​ There were no assets or liabilities measured at fair value on a nonrecurring basis as of December 31, 2023 or 2022.

Parent Company Only

Parent Company Only	12 Months Ended
	Dec. 31, 2023
Parent Company Only
Parent Company Only	(28) Parent Company Only ​ Presented below are the condensed balance sheets, statements of income, and statements of cash flows for Territorial Bancorp Inc. ​ Condensed Balance Sheets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Assets ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 18,453 ​ $ 28,515 ​ Investment in Territorial Savings Bank ​ 232,751 ​ 227,663 ​ Receivable from Territorial Savings Bank ​ — ​ 408 ​ Prepaid expenses and other assets ​ 272 ​ 105 ​ Total assets ​ $ 251,476 ​ $ 256,691 ​ Liabilities and Equity ​ ​ ​ ​ ​ ​ ​ Other liabilities ​ $ 390 ​ $ 141 ​ Equity ​ 251,086 ​ 256,550 ​ Total liabilities and equity ​ $ 251,476 ​ $ 256,691 ​ ​ Condensed Statements of Income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended December 31, (Dollars in thousands) 2023 2022 Interest and dividend income: ​ ​ ​ ​ ​ ​ ​ Dividends from Territorial Savings Bank ​ $ — ​ $ 17,500 ​ Interest-earning deposit with Territorial Savings Bank ​ 4 ​ 4 ​ Total interest and dividend income ​ 4 ​ 17,504 ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest expense: ​ ​ ​ ​ ​ ​ ​ Salaries ​ 42 ​ 42 ​ Other general and administrative expenses ​ 958 ​ 656 ​ Total noninterest expense ​ 1,000 ​ 698 ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) Income before income taxes and equity in undistributed earnings in subsidiaries ​ (996) ​ 16,806 ​ Income taxes ​ (315) ​ (209) ​ (Loss) Income before equity in undistributed earnings in subsidiaries ​ (681) ​ 17,015 ​ Equity in undistributed earnings of Territorial Savings Bank, net of dividends ​ 5,708 ​ (859) ​ Net income ​ $ 5,027 ​ $ 16,156 ​ ​ Condensed Statements of Cash Flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended December 31, (Dollars in thousands) 2023 2022 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 5,027 ​ $ 16,156 ​ Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ ​ ​ ​ ​ Equity in undistributed earnings of Territorial Savings Bank, net of dividends ​ (5,708) ​ 859 ​ Net decrease in prepaid expenses and other assets ​ 933 ​ 1,275 ​ Net increase (decrease) in other liabilities ​ 163 ​ (263) ​ Net cash provided by operating activities ​ 415 ​ 18,027 ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ Investment in Territorial Savings Bank ​ — ​ — ​ Net cash used in investing activities ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ Repurchases of common stock ​ (4,065) ​ (5,973) ​ Cash dividends paid ​ (6,412) ​ (9,071) ​ Net cash used in financing activities ​ (10,477) ​ (15,044) ​ Net (decrease) increase in cash ​ (10,062) ​ 2,983 ​ Cash at beginning of the period ​ 28,515 ​ 25,532 ​ Cash at end of the period ​ $ 18,453 ​ $ 28,515 ​ ​

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events
Subsequent Events	(29) Subsequent Events ​ On January 26, 2024, the Board of Directors of Territorial Bancorp Inc. declared a quarterly cash dividend of $0.05 per share of common stock. The dividend was paid on February 23, 2024 to stockholders of record as of February 9, 2024. ​

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies
Basis of Presentation	(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 repayments on outstanding loans receivable and investments, borrowings from the Federal Home Loan Bank (FHLB), Federal Reserve Bank (FRB), securities sold under agreements to repurchase, and proceeds from issuance of common stock.
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 subsidiary. 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, 2023 and 2022, the Company had $20.2 million and $20.8 million, respectively, of securities classified as available-for-sale and the remaining securites were classified as held-to-maturity. ​ 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 income line item in the Consolidated Statements of Income. Interest income is 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 credit 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 nonaccrual 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 write-down of the asset. Costs related to holding real estate are charged to expense while costs related to development and improvements are capitalized. Net gains or losses recognized on the sale of real estate owned are included in other general and administrative expenses. ​
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 or a U.S. government agency. The Company receives of the mortgage-backed securities issued. The mortgage-backed securities received in securitizations are valued at fair value and classified as held-to-maturity. A gain or loss in the securitization transactions is recognized for the difference between the fair value of the mortgage-backed securities received and the amortized cost of the loans securitized. ​ 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. The amount of mortgage servicing rights is immaterial to the financial statement.
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 . 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, 2023 and 2022, the Company had not recognized a liability for income tax uncertainties in the accompanying Consolidated Balance Sheets because management concluded that the Company does not have material uncertain tax positions. ​ The Company recognizes interest and penalties related to tax liabilities in other interest expense and other general and administrative expenses, respectively, in the Consolidated Statements of Income. ​ Tax years 2020 and after currently remain subject to examination by the Internal Revenue Service and 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 or other income, 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. ​
Share-Based Compensation	(o) Share-Based Compensation ​ The Company grants share-based compensation awards, including restricted stock and restricted stock units, which are either performance-based or time-based. The fair value of the restricted stock and restricted stock unit awards were based on the closing price of the Company’s stock on the date of grant. The cost of these awards are amortized in the Consolidated Statements of Income on a straight-line basis over the vesting period. The amount of performance-based restricted stock units that vest on a performance condition is remeasured quarterly based on how the Company’s return on average equity compares to the SNL Bank Index. The number of performance-based restricted stock units that are expected to vest based on the Company’s return on average equity is determined quarterly and the amortization of these stock awards is adjusted for any changes in the restricted stock units that are expected to vest. The fair value of performance-based restricted stock units that are based on how the Company’s total stock return compares to the SNL Bank Index was measured using a Monte-Carlo valuation. The number of performance-based restricted stock units that are based on the Company’s total stock return is amortized over the vesting period and is not adjusted for performance. ​ ​
Supplemental Employee Retirement Plan (SERP)	(p) Supplemental Employee Retirement Plan (SERP) ​ The SERP is a noncontributory supplemental retirement plan covering certain current and former employees of the Company. Benefits in the SERP plan are paid after retirement, in addition to the benefits provided by the Pension Plan. The Company accrues SERP costs over the estimated period until retirement by charging salaries and employee benefits expense in the Consolidated Statements of Income, with a corresponding credit to accounts payable and accrued expenses in the Consolidated Balance Sheets. ​
Employee Stock Ownership Plan (ESOP)	(q) 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	(r) Earnings Per Share ​ We have two forms of our outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Unvested restricted stock awards that are time-based contain nonforfeitable rights to dividends or dividend equivalents are considered to be participating securities in the earnings per share computation using the two-class method. Under the two-class method, earnings are allocated to common shareholders and participating securities according to their respective rights to earnings. Unvested restricted stock awards that vest based on performance or market conditions are not considered to be participating securities in the earnings per share calculation because accrued dividends on shares that do not vest are forfeited. ​ Basic earnings per share is computed by dividing net income allocated to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income allocated to common shareholders 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	(s) Common Stock Repurchase Program ​ 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. During 2023 and 2022, the Company repurchased per share, respectively, as part of the repurchase programs authorized by the Board of Directors.
Bank-Owned Life Insurance	​ (t) 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 of the Bank’s Tier 1 capital plus the allowance for loan losses. At December 31, 2023, this limit was
Leases	(u) Leases ​ The Company records a right-of-use (ROU) asset for those leases that convey rights to control use of identified assets for a period of time in exchange for consideration. The Company is also required to record a lease liability for the present value of future payment commitments. The Company leases most of its premises and some vehicles and equipment under operating leases expiring on various dates through 2037. The majority of lease agreements relate to real estate and generally provide that the Company pay taxes, insurance, maintenance and certain other variable operating expenses applicable to the leased premises. Variable lease components and nonlease components are not included in the Company’s computation of the ROU asset or lease liability. The Company also does not include short-term leases in the computation of the ROU asset or lease liability. Short-term leases are leases with a term at commencement of 12 months or less. Short-term lease expense is recorded on a straight-line basis over the term of the lease. Lease agreements do not contain any residual value guarantees or restrictive covenants. ​ The value of the ROU asset and lease liability is impacted by the amount of the periodic payment required, length of the lease term, lease incentives and the discount rate used to calculate the present value of the minimum lease payments. Certain leases have renewal options at the expiration of the lease terms. Generally, option periods are not included in the computation of the lease term, ROU asset or lease liability because the Company is not reasonably certain to exercise renewal options at the expiration of the lease terms. Because the discount rates implicit in our leases are not known, discount rates have been estimated using the rates for fixed-rate, amortizing advances from the FHLB for the approximate terms of the leases.
Use of Estimates	(v) 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 credit losses; valuation of certain investment securities; valuation allowances for deferred income tax assets; and assets and obligations related to employee benefit plans. Accordingly, actual results could differ from those estimates.
Recently Issued Accounting Pronouncements	​ (w) Recently Issued Accounting Pronouncements ​ In June 2016, the Financial Accounting Standards Board (FASB) issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU changed the threshold for recognizing losses from a “probable” to an “expected” model. The new model is referred to as the current expected credit loss model and applies to loans, leases, held-to-maturity investments, loan commitments, and financial guarantees. The standard requires the measurement of all expected credit losses for financial assets as of the reporting date (including historical experience, current conditions, and reasonable and supportable forecasts) and enhanced disclosures that will help financial statement users understand the estimates and judgments used in estimating credit losses and evaluating the credit quality of an organization’s portfolio. The amendment was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. In November 2019, the FASB issued an update that delayed the effective date of the amendment for smaller reporting companies, as defined by the Securities and Exchange Commission, to fiscal years beginning after December 15, 2022. The Company is a smaller reporting company. The Company adopted the standard on January 1, 2023, and applied the standard’s provisions as a cumulative-effect adjustment to retained earnings as of January 1, 2023. Upon adoption of the standard, the Company recorded a $3.2 million increase to the reserve for credit losses, which included a decrease of $49,000 in the reserves for off-balance sheet credit exposures. This resulted in a $2.3 million after-tax decrease to retained earnings as of January 1, 2023. The tax effect resulted in an increase in deferred tax assets. ​ In March 2022, the FASB issued ASU 2022-02, Financial Instruments-Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The ASU eliminates the accounting guidance for loans modified as troubled debt restructurings by creditors while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Additionally, the ASU requires public business entities to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases. This ASU was effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, upon the Company’s adoption of the amendments in ASU 2016-13. The Company adopted the standard on January 1, 2023, and it did not have a material effect on the Company’s consolidated financial statements. ​ In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions to clarify that contractual sale restrictions should not be considered in the measurement of the fair value of an equity security. The Company owns stock in the Federal Reserve Bank (FRB) and in the Federal Home Loan Bank (FHLB) which is valued at historical cost which approximates fair value. Ownership of stock is a condition for services the Company receives from the FRB and FHLB. The stock is not publicly traded and can only be issued, exchanged, redeemed or repurchased by the FRB and the FHLB. ASU 2022-03 is effective for fiscal years beginning after December 15, 2023. The Company does not expect the adoption of this ASU to have a material effect on its consolidated financial statements. ​ In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. The ASU is intended to clarify or improve disclosure and presentation requirements of a variety of topics. Many of the amendment will allow users to more easily compare entities subject to the SEC’s existing disclosures with those entities that were not previously subject to the requirements and align the requirements in the FASB accounting standard codification with the SEC’s regulations. The Company is currently evaluating the effects that ASU 2023-06 will have on its consolidated financial statements. ​ In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU is intended to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis to enable investors to develop more decision-useful financial analyses. This ASU will be effective for fiscal years beginning after December 31, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company does not expect the adoption of this ASU to have a material effect on its consolidated financial statements. ​ In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. This ASU will be effective for fiscal years beginning after December 15, 2024. The Company is currently evaluating the effects that ASU 2023-09 will have on its consolidated financial statements. ​

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2023
Cash and Cash Equivalents
Schedule of balances of cash and cash equivalents	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Cash and due from banks ​ $ 10,471 ​ $ 9,722 ​ Interest-earning deposits in other banks ​ 116,188 ​ 30,831 ​ Cash and cash equivalents ​ $ 126,659 ​ $ 40,553 ​ ​

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Investment Securities
Schedule of amortized cost and fair values of investment securities	The amortized cost and fair values of investment securities are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ Gross Unrealized ​ Estimated ​ ​ (Dollars in thousands) Cost Gains Losses Fair Value ACL December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ 22,563 ​ $ — $ (2,392) ​ $ 20,171 ​ $ — Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 685,728 ​ ​ 68 ​ (117,668) ​ ​ 568,128 ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 708,291 ​ $ 68 $ (120,060) ​ $ 588,299 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ 23,544 ​ $ — $ (2,723) ​ $ 20,821 ​ ​ ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 717,773 ​ ​ 62 ​ (126,751) ​ ​ 591,084 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 741,317 ​ $ 62 $ (129,474) ​ $ 611,905 ​ ​ ​
Schedule of amortized cost and estimated fair value of investment securities by maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized Estimated (Dollars in thousands) Cost Fair Value Available-for-sale: ​ ​ ​ ​ ​ ​ ​ Due after 10 years ​ $ 22,563 ​ $ 20,171 ​ Total ​ $ 22,563 ​ $ 20,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ Due within 5 years ​ $ 14 ​ $ 14 ​ Due after 5 years through 10 years ​ 7 ​ 6 ​ Due after 10 years ​ 685,707 ​ 568,108 ​ Total ​ $ 685,728 ​ $ 568,128 ​
Summary of investment securities in an 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, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government-sponsored enterprises ​ $ — ​ $ — ​ $ 20,171 ​ $ (2,392) 4 ​ $ 20,171 ​ $ (2,392) ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 10,326 ​ ​ (107) ​ ​ 554,514 ​ ​ (117,561) 152 ​ ​ 564,840 ​ ​ (117,668) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 10,326 ​ $ (107) ​ $ 574,685 ​ $ (119,953) ​ 156 ​ $ 585,011 ​ $ (120,060) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale: ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ — ​ ​ — ​ ​ — ​ Mortgage-backed securities issued by U.S. government sponsored enterprises ​ $ 20,821 ​ $ (2,723) ​ $ — ​ $ — 4 ​ $ 20,821 ​ $ (2,723) ​ Held-to-maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises ​ ​ 210,128 ​ ​ (22,209) ​ ​ 377,418 ​ ​ (104,542) 148 ​ ​ 587,546 ​ ​ (126,751) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 230,949 ​ $ (24,932) ​ $ 377,418 ​ $ (104,542) ​ 152 ​ $ 608,367 ​ $ (129,474) ​

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2023
Loans Receivable and Allowance for Credit Losses
Schedule of components of loans receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ (Dollars in thousands) 2023 2022 ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ First mortgages: ​ ​ ​ ​ ​ ​ ​ One- to four-family residential ​ $ 1,277,544 ​ $ 1,253,558 ​ Multi-family residential ​ 5,855 ​ 6,448 ​ Construction, commercial, and other ​ 11,631 ​ 23,903 ​ Home equity loans and lines of credit ​ 7,058 ​ 6,426 ​ Total real estate loans ​ 1,302,088 ​ 1,290,335 ​ Other loans: ​ ​ ​ ​ ​ ​ ​ Loans on deposit accounts ​ 196 ​ 216 ​ Consumer and other loans ​ 8,257 ​ 8,381 ​ Total other loans ​ ​ 8,453 ​ ​ 8,597 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ 1,310,541 ​ 1,298,932 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unearned fees and discounts ​ (1,989) ​ (2,136) ​ Total loans, net of unearned fees and discounts ​ 1,308,552 ​ 1,296,796 ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit/loan losses ​ (5,121) ​ (2,032) ​ Loans receivable, net of allowance for credit/loan losses ​ $ 1,303,431 ​ $ 1,294,764 ​ ​
Schedule of activity in allowance for loan losses on loans receivable and by portfolio segment	The table below presents the activity in the allowance for credit/loan losses by portfolio segment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction, Home Commercial, Equity and Other Loans and Residential Mortgage Lines of Consumer (Dollars in thousands) Mortgage Loans Credit and Other Unallocated Totals Year ended December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, beginning of year ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​ Adoption of ASU No. 2016-13 ​ ​ 3,393 ​ ​ 71 ​ ​ (1) ​ ​ 5 ​ ​ (259) ​ ​ 3,209 ​ (Reversal of provision) provision for credit losses ​ (110) ​ 9 ​ — ​ 98 ​ — ​ (3) ​ ​ ​ 4,546 ​ 514 ​ — ​ 178 ​ — ​ 5,238 ​ Charge-offs ​ (75) ​ — ​ — ​ (82) ​ — ​ (157) ​ Recoveries ​ 31 ​ — ​ — ​ 9 ​ — ​ 40 ​ Net charge-offs ​ (44) ​ — ​ — ​ (73) ​ — ​ (117) ​ Balance, end of year ​ $ 4,502 ​ $ 514 ​ $ — ​ $ 105 ​ $ — ​ $ 5,121 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, beginning of year ​ $ 1,814 ​ $ 435 ​ $ 1 ​ $ 89 ​ $ 330 ​ $ 2,669 ​ (Reversal of provision) provision for loan losses ​ (551) ​ (1) ​ — ​ 47 ​ (71) ​ (576) ​ ​ ​ 1,263 ​ 434 ​ 1 ​ 136 ​ 259 ​ 2,093 ​ Charge-offs ​ — ​ — ​ — ​ (62) ​ — ​ (62) ​ Recoveries ​ — ​ — ​ — ​ 1 ​ — ​ 1 ​ Net charge-offs ​ — ​ — ​ — ​ (61) ​ — ​ (61) ​ Balance, end of year ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​
Schedule of balance in allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction, Home Commercial, Equity and Other Loans and Residential Mortgage Lines of Consumer (Dollars in thousands) Mortgage Loans Credit and Other Unallocated Totals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Ending allowance balance: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Collectively evaluated for impairment ​ 1,263 ​ 434 ​ 1 ​ 75 ​ 259 ​ 2,032 ​ Total ending allowance balance ​ $ 1,263 ​ $ 434 ​ $ 1 ​ $ 75 ​ $ 259 ​ $ 2,032 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Ending loan balance: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ 2,693 ​ $ — ​ $ 16 ​ $ — ​ $ 6 ​ $ 2,715 ​ Collectively evaluated for impairment ​ 1,255,300 ​ 23,775 ​ 6,411 ​ 8,595 ​ — ​ 1,294,081 ​ Total ending loan balance ​ $ 1,257,993 ​ $ 23,775 ​ $ 6,427 ​ $ 8,595 ​ $ 6 ​ $ 1,296,796 ​ ​
Schedule of balance of impaired loans individually evaluated for impairment by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ Unpaid Recorded Principal (Dollars in thousands) Investment Balance December 31, 2022: ​ ​ ​ ​ ​ ​ ​ With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 2,693 ​ $ 3,209 ​ Home equity loans and lines of credit ​ ​ 16 ​ ​ 30 ​ Consumer loans ​ ​ 6 ​ 6 ​ Total ​ $ 2,715 ​ $ 3,245 ​ ​
Schedule of credit quality indicator by loan class and year.	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving Loans ​ ​ ​ ​ Amortized Cost of Term Loans by Origination Year ​ Amortized ​ ​ ​ (Dollars in thousands) ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Cost Basis ​ Total December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Loans not past due ​ ​ 387 ​ ​ 353 ​ ​ 4,836 ​ ​ — ​ ​ 203 ​ ​ 856 ​ ​ 1,230 ​ ​ 7,865 Total Commercial ​ ​ 387 ​ ​ 353 ​ ​ 4,836 ​ ​ — ​ ​ 203 ​ ​ 856 ​ ​ 1,230 ​ ​ 7,865 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ ​ 4 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 4 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Loans not past due ​ ​ 271 ​ ​ 80 ​ ​ 20 ​ ​ 4 ​ ​ 14 ​ ​ 42 ​ ​ 6,137 ​ ​ 6,568 Total Consumer ​ ​ 275 ​ ​ 80 ​ ​ 20 ​ ​ 4 ​ ​ 14 ​ ​ 42 ​ ​ 6,137 ​ ​ 6,572 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 428 ​ ​ — ​ ​ 428 60 - 89 days past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — 90 days or more past due ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 140 ​ ​ 87 ​ ​ — ​ ​ 227 Loans not past due ​ ​ 91,195 ​ ​ 129,148 ​ ​ 283,571 ​ ​ 183,887 ​ ​ 91,113 ​ ​ 514,546 ​ ​ — ​ ​ 1,293,460 Total Real Estate ​ ​ 91,195 ​ ​ 129,148 ​ ​ 283,571 ​ ​ 183,887 ​ ​ 91,253 ​ ​ 515,061 ​ ​ — ​ ​ 1,294,115 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 91,857 ​ $ 129,581 ​ $ 288,427 ​ $ 183,891 ​ $ 91,470 ​ $ 515,959 ​ $ 7,367 ​ $ 1,308,552
Schedule of gross charge offs by loan class and year of origination	The following table presents by loan class and year of origination, the gross charge-offs recorded during the year ended December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Total Year ended December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 13 ​ $ 62 ​ $ 75 Loans on deposit accounts ​ ​ 78 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 78 Consumer and other ​ ​ 1 ​ ​ — ​ ​ — ​ ​ — ​ ​ 3 ​ ​ — ​ ​ 4 Total ​ $ 79 ​ $ — ​ $ — ​ $ — ​ $ 16 ​ $ 62 ​ $ 157
Schedule of aging of loans and accrual status by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans 90 Days or More 30 - 59 60 - 89 90 Days or Past Due Days Past Days Past More Total Past Loans Not Total Nonaccrual and Still (Dollars in thousands) Due Due Past Due Due Past Due Loans Loans Accruing December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 428 ​ $ — ​ $ 227 ​ $ 655 ​ $ 1,274,960 ​ $ 1,275,615 ​ $ 2,079 ​ $ — ​ Multi-family residential mortgages ​ — ​ — ​ — ​ — ​ 5,848 ​ 5,848 ​ — ​ — ​ Construction, commercial, and other mortgages ​ — ​ — ​ — ​ — ​ 11,570 ​ 11,570 ​ — ​ — ​ Home equity loans and lines of credit ​ — ​ — ​ — ​ — ​ 7,060 ​ 7,060 ​ 11 ​ — ​ Loans on deposit accounts ​ — ​ — ​ — ​ — ​ 196 ​ 196 ​ — ​ — ​ Consumer and other ​ 4 ​ — ​ — ​ 4 ​ 8,259 ​ 8,263 ​ 170 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 432 ​ $ — ​ $ 227 ​ $ 659 ​ $ 1,307,893 ​ $ 1,308,552 ​ $ 2,260 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ — ​ $ 409 ​ $ 559 ​ $ 968 ​ $ 1,250,586 ​ $ 1,251,554 ​ $ 2,279 ​ $ — ​ Multi-family residential mortgages ​ — ​ — ​ — ​ — ​ 6,439 ​ 6,439 ​ — ​ — ​ Construction, commercial, and other mortgages ​ — ​ — ​ — ​ — ​ 23,775 ​ 23,775 ​ — ​ — ​ Home equity loans and lines of credit ​ — ​ — ​ — ​ — ​ 6,427 ​ 6,427 ​ 16 ​ — ​ Loans on deposit accounts ​ — ​ — ​ — ​ — ​ 217 ​ 217 ​ — ​ — ​ Consumer and other ​ 6 ​ — ​ 6 ​ 12 ​ 8,372 ​ 8,384 ​ 6 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 6 ​ $ 409 ​ $ 565 ​ $ 980 ​ $ 1,295,816 ​ $ 1,296,796 ​ $ 2,301 ​ $ — ​
Schedule of amortized cost basis of loans on nonaccrual status	The table below presents the amortized cost basis of loans on nonaccrual status as of December 31, 2023 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 December 31, 2022 (Dollars in thousands) Nonaccrual Loans With a Related ACL Nonaccrual Loans Without a Related ACL Total Nonaccrual Loans Total Nonaccrual Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family residential mortgages ​ $ 1,030 ​ $ 1,049 ​ $ 2,079 ​ $ 2,279 Home equity loans and lines of credit ​ ​ 11 ​ ​ — ​ ​ 11 ​ ​ 16 Consumer and other ​ ​ 170 ​ ​ — ​ ​ 170 ​ ​ 6 Total Nonaccrual Loans and Leases ​ $ 1,211 ​ $ 1,049 ​ $ 2,260 ​ $ 2,301

Accrued Interest Receivable (Ta

Accrued Interest Receivable (Tables)	12 Months Ended
	Dec. 31, 2023
Accrued Interest Receivable
Schedule of components of accrued interest receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Loans receivable ​ $ 4,585 ​ $ 4,595 ​ Investment securities ​ ​ 1,441 ​ ​ 1,497 ​ Interest-bearing deposits ​ 79 ​ 23 ​ Total ​ $ 6,105 ​ $ 6,115 ​ ​

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Premises and Equipment
Schedule of premises and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Land ​ $ 585 ​ $ 585 ​ Buildings and improvements ​ 1,400 ​ 1,400 ​ Leasehold improvements ​ 18,053 ​ 17,949 ​ Furniture, fixtures and equipment ​ 6,613 ​ 6,766 ​ Automobiles ​ 96 ​ 130 ​ ​ ​ 26,747 ​ 26,830 ​ Less accumulated depreciation and amortization ​ (19,783) ​ (19,494) ​ ​ ​ 6,964 ​ 7,336 ​ Construction in progress ​ 221 ​ 263 ​ Total ​ $ 7,185 ​ $ 7,599 ​ ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits
Summary of deposit accounts by type with their respective weighted-average interest rates	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 (Dollars in thousands) Amount Rate Amount Rate Non-interest bearing ​ $ 66,757 — % $ 68,095 — % Savings accounts ​ 739,036 0.59 ​ 910,652 0.13 ​ Certificates of deposit ​ 532,433 4.11 ​ 429,687 2.67 ​ Money market ​ 3,595 0.10 ​ 5,372 0.10 ​ Checking and Super NOW ​ 294,783 0.02 ​ 302,346 0.02 ​ Total ​ $ 1,636,604 1.61 % $ 1,716,152 0.74 % ​
Schedule of maturity of certificate of deposit accounts	​ ​ ​ ​ ​ ​ Maturing in: ​ ​ Due within 1 year ​ $ 498,140 ​ Due after 1year through 2 years ​ 20,142 ​ Due after 2 years through 3 years ​ 5,746 ​ Due after 3 years through 4 years ​ 3,743 ​ Due after 4 years through 5 years ​ 4,662 ​ Total ​ $ 532,433 ​
Schedule of interest expense by type of deposit	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, (Dollars in thousands) ​ 2023 ​ ​ 2022 ​ Savings ​ $ 2,469 ​ $ 949 ​ Certificates of deposit and money market ​ 16,956 ​ 3,914 ​ Checking and Super NOW ​ 59 ​ 62 ​ Total ​ $ 19,484 ​ $ 4,925 ​ ​

Advances from the Federal Hom_2

Advances from the Federal Home Loan Bank (Tables)	12 Months Ended
	Dec. 31, 2023
Advances from the Federal Home Loan Bank
Schedule of advances outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2023 ​ 2022 ​ ​ ​ Weighted ​ ​ Weighted ​ ​ ​ Average ​ ​ ​ ​ Average ​ (Dollars in thousands) Amount ​ Rate ​ Amount ​ Rate ​ Due within one year ​ $ 82,000 1.40 % $ 24,000 1.27 % Due over 1 year to 2 years ​ ​ 45,000 2.87 ​ ​ 82,000 1.40 ​ Due over 2 years to 3 years ​ 20,000 3.20 ​ 25,000 1.58 ​ Due over 3 years to 4 years ​ ​ 30,000 4.24 ​ 10,000 1.97 ​ Due over 4 years to 5 years ​ ​ 60,000 ​ 4.32 ​ ​ — ​ — ​ Due over 5 years to 6 years ​ 5,000 4.38 ​ — — ​ Total ​ $ 242,000 2.96 % $ 141,000 1.45 % ​

Advances from the Federal Res_2

Advances from the Federal Reserve Bank (Tables)	12 Months Ended
	Dec. 31, 2023
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Schedule of BTFP advances outstanding	​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Weighted ​ ​ ​ Average ​ (Dollars in thousands) Amount ​ Rate ​ Due within one year ​ $ 50,000 4.89 % Total ​ $ 50,000 ​ 4.89 % ​

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2023
Securities Sold Under Agreements to Repurchase
Summary of securities sold under agreements to repurchase	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ Weighted ​ Weighted ​ Repurchase Average ​ Repurchase Average ​ (Dollars in thousands) Liability Rate Liability Rate ​ Maturing: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 year or less ​ $ 5,000 1.88 % ​ $ — — % ​ Over 1 year to 2 years ​ ​ 5,000 ​ 1.73 ​ ​ ​ 5,000 ​ 1.81 ​ ​ Over 2 years to 3 years ​ — — ​ ​ ​ 5,000 1.73 ​ ​ Total ​ $ 10,000 1.81 % ​ $ 10,000 1.81 % ​ ​
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 ​ $ 14,230 ​ $ 12,239 ​ $ 10,000 ​ $ 4,230 12 ​ ​

Offsetting of Financial Liabi_2

Offsetting of Financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Offsetting of Financial Liabilities
Schedule of securities sold under agreements to repurchase subject to conditional right of offset	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Amount of Gross Amount Not Offset in the Gross Amount Gross Amount Liabilities Balance Sheet of Recognized Offset in the Presented in the Financial Cash Collateral (Dollars in thousands) Liabilities Balance Sheet Balance Sheet Instruments ​ Pledged Net Amount December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities sold under agreements to repurchase ​ $ 10,000 ​ $ — ​ $ 10,000 ​ $ 10,000 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities sold under agreements to repurchase ​ $ 10,000 ​ $ — ​ $ 10,000 ​ $ 10,000 ​ $ — ​ $ — ​

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Taxes
Schedule of allocation of federal and state income taxes between current and deferred provisions	​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) 2023 2022 Current ​ ​ ​ ​ ​ ​ ​ Federal ​ $ 1,767 ​ $ 2,911 ​ State ​ 568 ​ 1,317 ​ ​ ​ 2,335 ​ 4,228 ​ Deferred ​ ​ ​ ​ ​ ​ ​ Federal ​ (396) ​ 990 ​ State ​ (129) ​ 100 ​ ​ ​ (525) ​ 1,090 ​ Total ​ $ 1,810 ​ $ 5,318 ​ ​
Schedule of reconciliation of tax provision based on statutory corporate rate on pretax income and provision for taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) 2023 2022 ​ Income tax expense at statutory rate ​ $ 1,436 ​ $ 4,510 ​ Income tax effect of: ​ ​ ​ ​ ​ ​ ​ State income taxes, net of federal income tax benefits ​ 628 ​ 1,079 ​ Other tax-exempt income ​ (179) ​ (166) ​ Share-based compensation ​ 12 ​ 9 ​ Meal and entertainment expenses ​ ​ 53 ​ ​ 49 ​ Non-deductible executive compensation ​ ​ 70 ​ ​ 119 ​ Recovery on bank-owned life insurance ​ ​ — ​ ​ (216) ​ Other ​ (210) ​ (66) ​ Total income tax expense ​ $ 1,810 ​ $ 5,318 ​ Effective income tax rate ​ 26.47 % 24.76 %
Schedule of components of income taxes payable (receivable)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Current taxes (receivable) payable: ​ ​ ​ ​ ​ ​ ​ Federal ​ $ (932) ​ $ (519) ​ State ​ 588 ​ 1,357 ​ ​ ​ $ (344) ​ $ 838 ​ Deferred taxes receivable: ​ ​ ​ ​ ​ ​ ​ Federal ​ $ (1,313) ​ $ (707) ​ State ​ (1,144) ​ (936) ​ ​ ​ $ (2,457) ​ $ (1,643) ​ ​
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) 2023 2022 Deferred tax assets: ​ ​ ​ ​ ​ ​ ​ Hawaii franchise tax ​ $ 117 ​ $ 377 ​ Allowance for credit/loan losses ​ 1,364 ​ 541 ​ Employee benefit plans ​ 2,672 ​ 2,714 ​ Equity incentive plan ​ 107 ​ 141 ​ Deferred compensation ​ 22 ​ 199 ​ Net lease liability ​ ​ 1,312 ​ ​ 212 ​ Unrealized loss on securities available for sale ​ ​ 637 ​ ​ 725 ​ Other ​ 11 ​ 16 ​ ​ ​ 6,242 ​ 4,925 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Deferred loan costs ​ 2,665 ​ 2,601 ​ Premises and equipment ​ ​ 273 ​ ​ 254 ​ FHLB stock dividends ​ 126 ​ 125 ​ Prepaid expense ​ 653 ​ 226 ​ Premiums on loans sold ​ 68 ​ 76 ​ ​ ​ 3,785 ​ 3,282 ​ Net deferred tax assets ​ $ 2,457 ​ $ 1,643 ​ ​

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Employee Benefit Plans
Schedule of status of Pension Plan and SERP	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan ​ SERP ​ ​ December 31, (Dollars in thousands) 2023 2022 2023 2022 Accumulated benefit obligation at end of year ​ $ 15,953 ​ $ 15,865 ​ $ 9,927 ​ $ 9,947 ​ Change in projected benefit obligation: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation at beginning of year ​ $ 15,866 ​ $ 20,943 ​ $ 9,948 ​ $ 9,915 ​ Service cost (income) ​ 191 ​ 118 ​ (200) ​ (135) ​ Interest cost ​ 822 ​ 597 ​ 179 ​ 179 ​ Actuarial loss (gain) ​ 94 ​ (4,802) ​ — ​ — ​ Benefits paid ​ (1,020) ​ (990) ​ — ​ (11) ​ Benefit obligation at end of year ​ 15,953 ​ 15,866 ​ 9,927 ​ 9,948 ​ Change in plan assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value of plan assets at beginning of year ​ 18,336 ​ 23,125 ​ — ​ — ​ Actual return on plan assets ​ 2,789 ​ (3,799) ​ — ​ — ​ Employer contributions ​ — ​ — ​ — ​ 11 ​ Benefits paid ​ (1,020) ​ (990) ​ — ​ (11) ​ Fair value of plan assets at end of year ​ 20,105 ​ 18,336 ​ — ​ — ​ Funded status at end of year ​ $ 4,152 ​ $ 2,470 ​ $ (9,927) ​ $ (9,948) ​ Amounts recognized in the Consolidated Balance Sheets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prepaid expenses and other assets (Accounts payable and accrued expenses) ​ $ 4,152 ​ $ 2,470 ​ $ (9,927) ​ $ (9,948) ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net actuarial loss ​ $ 5,968 ​ $ 7,708 ​ $ — ​ $ — ​ Prior service cost ​ 119 ​ 124 ​ — ​ — ​ Accumulated other comprehensive loss, before tax ​ $ 6,087 ​ $ 7,832 ​ $ — ​ $ — ​
Schedule of changes recognized in accumulated other comprehensive loss for Pension Plan	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan ​ ​ Year Ended December 31, (Dollars in thousands) 2023 2022 Accumulated other comprehensive loss at beginning of year, before tax ​ $ 7,832 ​ $ 7,530 ​ Actuarial net (gain) loss arising during the period ​ (1,503) ​ 517 ​ Amortizations (recognized in net periodic benefit cost): ​ ​ ​ ​ ​ ​ ​ Actuarial loss ​ (237) ​ (210) ​ Prior service cost ​ (5) ​ (5) ​ Total recognized in other comprehensive loss ​ (1,745) ​ 302 ​ Accumulated other comprehensive loss at end of year, before tax ​ $ 6,087 ​ $ 7,832 ​ ​
Schedule of weighted average assumptions used to determine benefit obligations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan ​ SERP ​ ​ Year Ended December 31, ​ 2023 2022 2023 2022 Assumptions used to determine the year-end benefit obligations: ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 5.10 % 5.40 % 5.00 % 5.00 % 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: ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ in Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Total Fair ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Value ​ (Level 1) ​ (Level 2) ​ (Level 3) December 31, 2023: ​ ​ ​ ​ ​ Cash ​ $ 622 ​ $ 622 ​ $ — ​ $ — ​ Equities ​ 13,742 ​ 13,742 ​ — ​ — ​ Mutual funds (1) ​ 5,741 ​ 5,741 ​ — ​ — ​ Total ​ $ 20,105 ​ $ 20,105 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 1,452 ​ $ 1,452 ​ $ — ​ $ — ​ Equities ​ 11,659 ​ 11,659 ​ — ​ — ​ Mutual funds (1) ​ 5,225 ​ 5,225 ​ — ​ — ​ Total ​ $ 18,336 ​ $ 18,336 ​ $ — ​ $ — ​ (1) 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 2024 ​ $ 1,001 ​ $ 319 ​ 2025 ​ 1,122 ​ 8,696 ​ 2026 ​ 1,195 ​ 95 ​ 2027 ​ 1,216 ​ 95 ​ 2028 ​ 1,224 ​ 95 ​ 2029 - 2033 ​ 6,017 ​ 473 ​ Total ​ $ 11,775 ​ $ 9,773 ​ ​
Schedule of weighted average assumptions used to determine net periodic benefit cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan ​ SERP ​ ​ Year Ended December 31, ​ 2023 2022 2023 2022 Assumptions used to determine the net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 5.40 % 2.90 % 5.00 % 5.00 % Expected return on plan assets 6.75 ​ 6.75 ​ — ​ — ​ Rate of compensation increase N/A ​ N/A ​ 5.00 ​ 5.00 ​ ​
Schedule of components of net periodic benefit cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Plan SERP ​ ​ Year Ended December 31, ​ (Dollars in thousands) 2023 2022 2023 2022 Net periodic benefit (income) cost for the year: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost (income) ​ $ 191 ​ $ 118 ​ $ (200) ​ $ (135) ​ Interest cost ​ 822 ​ 597 ​ 179 ​ 179 ​ Expected return on plan assets ​ (1,192) ​ (1,520) ​ — ​ — ​ Amortization of prior service cost ​ 5 ​ 5 ​ — ​ — ​ Recognized actuarial loss ​ 237 ​ 210 ​ — ​ — ​ Recognized curtailment loss ​ — ​ — ​ — ​ — ​ Net periodic benefit (income) cost for the year: ​ $ 63 ​ $ (590) ​ $ (21) ​ $ 44 ​

Employee Stock Ownership Plan (

Employee Stock Ownership Plan (Tables)	12 Months Ended
	Dec. 31, 2023
Employee Stock Ownership Plan.
Schedule of shares held by the ESOP trust	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, 2023 2022 Allocated shares ​ 619,938 ​ 583,474 ​ ​ Unearned shares ​ 244,665 ​ 293,598 ​ ​ Total ESOP shares ​ 864,603 ​ 877,072 ​ ​ Fair value of unearned shares, in thousands ​ $ 2,728 ​ $ 7,049 ​ ​ ​

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Schedule of compensation expense and related tax benefit for all share-based awards	​ ​ ​ ​ ​ ​ ​ ​ ​ (In thousands) 2023 2022 Compensation expense ​ $ 177 ​ $ 480 ​ Income tax benefit ​ 48 ​ 131 ​
Restricted Stock
Schedule of restricted stock award activity	​ ​ ​ ​ ​ ​ ​ ​ Weighted Average Grant Restricted Date Fair Stock Value Unvested at December 31, 2021 ​ 23,208 ​ $ 24.61 ​ Granted 12,013 ​ 23.77 ​ Vested 11,557 ​ 24.68 ​ Forfeited — ​ — ​ Unvested at December 31, 2022 23,664 ​ $ 24.15 ​ Granted 14,803 ​ 19.29 ​ Vested 12,729 ​ 23.64 ​ Forfeited — ​ — ​ Unvested at December 31, 2023 25,738 ​ $ 21.61 ​
Restricted Stock Units Based on a Performance Condition
Schedule of restricted stock award activity	​ ​ ​ ​ ​ ​ ​ Performance- ​ ​ ​ ​ Based Restricted ​ ​ ​ Stock Units Weighted ​ ​ Based on a ​ Average Grant ​ ​ Performance ​ Date Fair Condition Value Unvested at December 31, 2021 41,583 ​ $ 24.68 Granted 14,412 ​ 23.77 Vested 7,670 ​ 27.30 Forfeited 4,768 ​ 27.30 Unvested at December 31, 2022 43,557 ​ $ 23.63 Granted 17,758 ​ 19.29 Vested — ​ — Forfeited 16,348 ​ 21.05 Unvested at December 31, 2023 44,967 ​ $ 22.85
Restricted Stock Units Based on a Market Condition
Schedule of restricted stock award activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance- ​ ​ ​ ​ ​ Based Restricted ​ Monte Carlo ​ ​ Stock Units ​ Valuation of ​ ​ Based on a ​ the Company's Market Condition Stock Unvested at December 31, 2021 10,396 ​ $ 24.03 Granted 3,603 ​ 24.42 Vested ​ ​ — Forfeited 3,110 ​ 24.45 Unvested at December 31, 2022 10,889 ​ $ 24.04 Granted 4,443 ​ 17.95 Vested — ​ — Forfeited 4,087 ​ 22.16 Unvested at December 31, 2023 11,245 ​ $ 22.31

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
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) 2023 2022 Net income ​ $ 5,027 ​ $ 16,156 ​ Income allocated to participating securities ​ ​ (48) ​ ​ (98) ​ Net income available to common shareholders ​ $ 4,979 ​ $ 16,058 ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average number of shares used in: ​ ​ ​ ​ ​ ​ ​ Basic earnings per share ​ 8,636,495 ​ 8,865,946 ​ Dilutive common stock equivalents: ​ ​ ​ ​ ​ ​ ​ Stock options and restricted stock units ​ 47,597 ​ 54,768 ​ Diluted earnings per share ​ 8,684,092 ​ 8,920,714 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income per common share, basic ​ $ 0.58 ​ $ 1.81 ​ Net income per common share, diluted ​ $ 0.57 ​ $ 1.80 ​ ​

Other Comprehensive Loss (Table

Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Loss
Schedule of changes in components of accumulated other comprehensive loss, net of taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unfunded Unrealized Pension Loss on (Dollars in thousands) Liability Securities Total December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at beginning of year ​ $ 5,746 ​ $ 1,998 ​ $ 7,744 ​ Other comprehensive income, net of taxes ​ (1,280) ​ (243) ​ (1,523) ​ Net current period other comprehensive income ​ (1,280) ​ (243) ​ (1,523) ​ Balances at end of year ​ $ 4,466 ​ $ 1,755 ​ $ 6,221 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at beginning of year ​ $ 5,524 ​ $ — ​ $ 5,524 ​ Other comprehensive loss, net of taxes ​ 222 ​ 1,998 ​ 2,220 ​ Net current period other comprehensive loss ​ 222 ​ 1,998 ​ 2,220 ​ Balances at end of year ​ $ 5,746 ​ $ 1,998 ​ $ 7,744 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of tax effect on each component of accumulated other comprehensive loss	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2023 ​ 2022 Pretax ​ ​ After Tax Pretax ​ ​ After Tax (Dollars in thousands) Amount ​ Tax ​ Amount ​ Amount ​ Tax ​ Amount Unfunded pension liability ​ $ (1,745) ​ $ 465 ​ $ (1,280) ​ $ 302 ​ $ (80) ​ $ 222 ​ Unrealized loss on securities ​ (331) ​ 88 ​ (243) ​ 2,723 ​ (725) ​ 1,998 ​ Total ​ $ (2,076) ​ $ 553 ​ $ (1,523) ​ $ 3,025 ​ $ (805) ​ $ 2,220 ​ ​

Regulatory Capital and Superv_2

Regulatory Capital and Supervision (Tables)	12 Months Ended
	Dec. 31, 2023
Regulatory Capital and Supervision
Schedule of regulatory capital ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) Required Ratio Actual Amount Actual Ratio December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Leverage Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 5.00 % ​ $ 238,972 ​ 10.86 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 11.69 % Common Equity Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 9.00 % ​ $ 238,972 ​ 26.31 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 28.33 % Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 10.50 % ​ $ 238,972 ​ 26.31 % Territorial Bancorp Inc. ​ ​ ​ $ 257,307 ​ 28.33 % Total Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 12.50 % ​ $ 244,093 ​ 26.87 % Territorial Bancorp Inc. ​ ​ ​ $ 262,428 ​ 28.89 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Leverage Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 5.00 % ​ $ 235,408 ​ 10.87 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 12.21 % Common Equity Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 9.00 % ​ $ 235,408 ​ 25.98 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 29.16 % Tier 1 Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 10.50 % ​ $ 235,408 ​ 25.98 % Territorial Bancorp Inc. ​ ​ ​ $ 264,295 ​ 29.16 % Total Risk-Based Capital (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Territorial Savings Bank 12.50 % ​ $ 237,488 ​ 26.20 % Territorial Bancorp Inc. ​ ​ ​ $ 266,375 ​ 29.39 % (1) The required Common Equity Tier 1 Risk-Based Capital, Tier 1 Risk-Based Capital, and Total Risk-Based Capital ratios are based on the fully-phased in capital ratios in the Basel III capital regulations plus the 2.50% capital conservation buffer. ​

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue Recognition
Reconciliation of revenue from contracts with customers and other revenue reported in line items	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service and ​ ​ ​ ​ (Dollars in thousands) Other Fees Other Total Year ended December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue from contracts with customers ​ $ 1,186 ​ $ 122 ​ $ 1,308 Other revenue ​ ​ 141 ​ ​ 157 ​ ​ 298 Total ​ $ 1,327 ​ $ 279 ​ $ 1,606 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue from contracts with customers ​ $ 1,276 ​ $ 221 ​ $ 1,497 Other revenue ​ ​ 140 ​ ​ 1,783 ​ ​ 1,923 Total ​ $ 1,416 ​ $ 2,004 ​ $ 3,420 ​

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases
Schedule of lease costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 31, (Dollars in thousands) 2023 2022 Lease costs: ​ ​ ​ ​ ​ ​ ​ Operating lease costs ​ $ 2,757 ​ $ 2,991 ​ Short-term lease costs ​ 511 ​ 296 ​ Variable lease costs ​ 163 ​ 165 ​ Total lease costs ​ $ 3,431 ​ $ 3,452 ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in measurement of lease liabilities ​ $ (991) ​ $ 3,193 ​ ROU assets obtained in exchange for new operating lease liabilities ​ $ 693 ​ $ 7,462 ​
Schedule of future minimum rental commitments under noncancellable operating leases and lease payment obligations	​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2024 ​ $ 2,818 2025 ​ 2,199 2026 ​ 2,038 2027 ​ 1,961 2028 ​ 1,729 Thereafter ​ 9,299 Total ​ ​ 20,044 ​ ​ ​ ​ Less lease incentives to be received in 2024 ​ ​ (729) Less present value discount ​ ​ (2,018) Present value of leases ​ $ 17,297
Schedule of other lease related information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ December 31, ​ ​ ​ 2023 ​ 2022 ​ Weighted-average remaining lease term (years) ​ 9.77 ​ ​ 8.88 ​ ​ Weighted-average discount rate ​ ​ 2.15 % ​ ​ 2.03 % ​

Fair Value of Financial Instrum

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value
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, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 126,659 ​ $ 126,659 ​ $ 126,659 ​ $ — ​ $ — ​ Investment securities available for sale ​ ​ 20,171 ​ ​ 20,171 ​ ​ — ​ ​ 20,171 ​ ​ — ​ Investment securities held to maturity ​ 685,728 ​ ​ 568,128 ​ ​ — ​ ​ 568,128 ​ ​ — ​ Loans receivable, net ​ 1,303,431 ​ ​ 1,120,704 ​ ​ — ​ ​ — ​ ​ 1,120,704 ​ FHLB stock ​ 12,192 ​ ​ 12,192 ​ ​ — ​ ​ 12,192 ​ ​ — ​ FRB stock ​ ​ 3,180 ​ ​ 3,180 ​ ​ — ​ ​ 3,180 ​ ​ — ​ Accrued interest receivable ​ 6,105 ​ ​ 6,105 ​ ​ 79 ​ ​ 1,441 ​ ​ 4,585 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 1,636,604 ​ ​ 1,633,164 ​ ​ — ​ ​ 1,104,171 ​ ​ 528,993 ​ Advances from the Federal Home Loan Bank ​ 242,000 ​ ​ 238,380 ​ ​ — ​ ​ 238,380 ​ ​ — ​ Advances from the Federal Reserve Bank ​ ​ 50,000 ​ ​ 50,049 ​ ​ ​ ​ ​ 50,049 ​ ​ — ​ Securities sold under agreements to repurchase ​ 10,000 ​ ​ 9,700 ​ ​ — ​ ​ 9,700 ​ ​ — ​ Accrued interest payable ​ 1,183 ​ ​ 1,183 ​ ​ — ​ ​ 157 ​ ​ 1,026 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 40,553 ​ $ 40,553 ​ $ 40,553 ​ $ — ​ $ — ​ Investment securities available for sale ​ ​ 20,821 ​ ​ 20,821 ​ ​ — ​ ​ 20,821 ​ ​ — ​ Investment securities held to maturity ​ 717,773 ​ ​ 591,084 ​ ​ — ​ ​ 591,084 ​ ​ — ​ Loans receivable, net ​ 1,294,764 ​ ​ 1,180,840 ​ ​ — ​ ​ — ​ ​ 1,180,840 ​ FHLB stock ​ 8,197 ​ ​ 8,197 ​ ​ — ​ ​ 8,197 ​ ​ — ​ FRB stock ​ ​ 3,170 ​ ​ 3,170 ​ ​ — ​ ​ 3,170 ​ ​ — ​ Accrued interest receivable ​ 6,115 ​ ​ 6,115 ​ ​ 23 ​ ​ 1,497 ​ ​ 4,595 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 1,716,152 ​ ​ 1,708,612 ​ ​ — ​ ​ 1,286,465 ​ ​ 422,147 ​ Advances from the Federal Home Loan Bank ​ 141,000 ​ ​ 133,145 ​ ​ — ​ ​ 133,145 ​ ​ — ​ Securities sold under agreements to repurchase ​ 10,000 ​ ​ 9,440 ​ ​ — ​ ​ 9,440 ​ ​ — ​ Accrued interest payable ​ 701 ​ ​ 701 ​ ​ — ​ ​ 33 ​ ​ 668 ​ ​
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, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available for sale ​ $ — ​ $ 20,171 ​ $ — ​ $ 20,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available for sale ​ $ — ​ $ 20,821 ​ $ — ​ $ 20,821 ​ ​ There were no assets or liabilities measured at fair value on a nonrecurring basis as of December 31, 2023 or 2022.

Parent Company Only (Tables)

Parent Company Only (Tables)	12 Months Ended
	Dec. 31, 2023
Parent Company Only
Condensed Balance Sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2023 2022 Assets ​ ​ ​ ​ ​ ​ ​ Cash ​ $ 18,453 ​ $ 28,515 ​ Investment in Territorial Savings Bank ​ 232,751 ​ 227,663 ​ Receivable from Territorial Savings Bank ​ — ​ 408 ​ Prepaid expenses and other assets ​ 272 ​ 105 ​ Total assets ​ $ 251,476 ​ $ 256,691 ​ Liabilities and Equity ​ ​ ​ ​ ​ ​ ​ Other liabilities ​ $ 390 ​ $ 141 ​ Equity ​ 251,086 ​ 256,550 ​ Total liabilities and equity ​ $ 251,476 ​ $ 256,691 ​
Condensed Statements of Income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended December 31, (Dollars in thousands) 2023 2022 Interest and dividend income: ​ ​ ​ ​ ​ ​ ​ Dividends from Territorial Savings Bank ​ $ — ​ $ 17,500 ​ Interest-earning deposit with Territorial Savings Bank ​ 4 ​ 4 ​ Total interest and dividend income ​ 4 ​ 17,504 ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest expense: ​ ​ ​ ​ ​ ​ ​ Salaries ​ 42 ​ 42 ​ Other general and administrative expenses ​ 958 ​ 656 ​ Total noninterest expense ​ 1,000 ​ 698 ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) Income before income taxes and equity in undistributed earnings in subsidiaries ​ (996) ​ 16,806 ​ Income taxes ​ (315) ​ (209) ​ (Loss) Income before equity in undistributed earnings in subsidiaries ​ (681) ​ 17,015 ​ Equity in undistributed earnings of Territorial Savings Bank, net of dividends ​ 5,708 ​ (859) ​ Net income ​ $ 5,027 ​ $ 16,156 ​
Condensed Statements of Cash Flows	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended December 31, (Dollars in thousands) 2023 2022 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 5,027 ​ $ 16,156 ​ Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ ​ ​ ​ ​ Equity in undistributed earnings of Territorial Savings Bank, net of dividends ​ (5,708) ​ 859 ​ Net decrease in prepaid expenses and other assets ​ 933 ​ 1,275 ​ Net increase (decrease) in other liabilities ​ 163 ​ (263) ​ Net cash provided by operating activities ​ 415 ​ 18,027 ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ Investment in Territorial Savings Bank ​ — ​ — ​ Net cash used in investing activities ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ Repurchases of common stock ​ (4,065) ​ (5,973) ​ Cash dividends paid ​ (6,412) ​ (9,071) ​ Net cash used in financing activities ​ (10,477) ​ (15,044) ​ Net (decrease) increase in cash ​ (10,062) ​ 2,983 ​ Cash at beginning of the period ​ 28,515 ​ 25,532 ​ Cash at end of the period ​ $ 18,453 ​ $ 28,515 ​ ​

Organization - Narrative (Detai

Organization - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 subsidiary
Organization
Number of inactive subsidiaries	1

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Allowance of Credit Losses (ACL) on Loans and Securities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies
Financing receivable accrued interest after allowance for credit loss	$ 4,600,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable
Reserve for off-balance sheet credit exposure		$ 49,000

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Description of Business, Investment Securities and Transfer of Financial Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)
Description of Business
Number of branches located throughout Hawaii | item	28
Investment Securities
Investment securities available for sale, at fair value | $	$ 20,171	$ 20,821
Transfer of financial assets
Percentage of receipt on transfer of mortgage-backed securities issued	100%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Premises and Equipment Useful Lives (Details)	Dec. 31, 2023
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 Accoun_6

Summary of Significant Accounting Policies - Common Stock Repurchase Program and Forms of Outstanding Common Stock (Details)	12 Months Ended
	Dec. 31, 2023 security $ / shares shares	Dec. 31, 2022 $ / shares shares
Common stock
Number of different forms of outstanding common stock | security	2
Common Stock Repurchase Program
Common Stock Repurchase Program
Repurchase of shares of common stock (in shares) | shares	250,882	262,621
Average cost of shares repurchased (in dollars per share) | $ / shares	$ 16.05	$ 22.75

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Bank-Owned Life Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Bank-Owned Life Insurance
Percentage applied on Tier 1 capital plus allowance for loan losses to calculate ceiling limit of investment	25%
Amount of ceiling limit of investment	$ 61,000
Amount of investment in bank-owned life insurance	$ 48,638	$ 47,783

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncement (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of Significant Accounting Policies
Right-of-use asset, net	$ 12,371	$ 14,498
Lease liability	17,297	15,295
Allowance for loan losses	$ 5,121	$ 2,032	$ 2,669

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents
Cash and due from banks	$ 10,471	$ 9,722
Interest-earning deposits in other banks	116,188	30,831
Cash and cash equivalents	$ 126,659	$ 40,553

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-Sale [Abstract]
Amortized Cost	$ 22,563
Estimated Fair Value	20,171	$ 20,821
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	685,728	717,773
Gross Unrealized Gains	68
Gross Unrealized Losses	(117,668)	(126,751)
Estimated Fair Value	568,128	591,084
Debt Securities, Available-for-Sale and Held-to-Maturity, after Allowance for Credit Loss [Abstract]
Total Amortized Cost	708,291	741,317
Total Gross Unrealized Gains	68	62
Total Gross Unrealized Losses	(120,060)	(129,474)
Total Estimated Fair Value	588,299	611,905
U.S. government-sponsored mortgage-backed securities
Available-for-Sale [Abstract]
Amortized Cost	22,563	23,544
Gross Unrealized Losses	(2,392)	(2,723)
Estimated Fair Value	$ 20,171	20,821
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost		717,773
Gross Unrealized Gains		62
Estimated Fair Value		$ 591,084

Investment Securities - Maturit

Investment Securities - Maturity Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due after 10 years	$ 22,563
Amortized Cost	22,563
Estimated Fair Value
Due after 10 years	20,171
Estimated Fair Value	$ 20,171	$ 20,821

Investment Securities - Matur_2

Investment Securities - Maturity Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Held-to-maturity, Amortized Cost
Due within 5 years	$ 14
Due after 5 years through 10 years	7
Due after 10 years	685,707
Amortized Cost	685,728	$ 717,773
Held-to-maturity, Estimated Fair Value
Due within 5 years	14
Due after 5 years through 10 years	6
Due after 10 years	568,108
Estimated Fair Value	$ 568,128	$ 591,084

Investment Securities - Realize

Investment Securities - Realized Gains and Losses and Proceeds from Sales (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
U.S. government-sponsored mortgage-backed securities
Realized gains and losses and the proceeds from sales of securities
Proceeds from sales	$ 0

Investment Securities - Securit

Investment Securities - Securities Pledged (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Realized gains and losses and the proceeds from sales of securities
Amortized cost	$ 685,728	$ 717,773
Asset Pledged as Collateral with Right [Member] | Deposits [Member]
Realized gains and losses and the proceeds from sales of securities
Amortized cost	555,800,000	272,800,000
Asset Pledged as Collateral with Right [Member] | Federal Reserve Bank discount window [Member]
Realized gains and losses and the proceeds from sales of securities
Amortized cost	74,000,000	$ 5,400,000
Asset Pledged as Collateral with Right [Member] | Federal Reserve Bank Bank Term Funding Program [Member]
Realized gains and losses and the proceeds from sales of securities
Amortized cost	$ 202,100,000

Investment Securities - Summary

Investment Securities - Summary of Investment Securities In Unrealized Loss Position Summary (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Available-for-Sale [Abstract]
Less Than 12 Months Fair Value		$ 20,821
Less Than 12 Months Unrealized Losses		$ (2,723)
12 Months or Longer Fair Value	$ 20,171
12 Months or Longer Unrealized Losses	$ (2,392)
Total Number of Securities | security	4	4
Total Fair Value	$ 20,171	$ 20,821
Total Unrealized Losses	(2,392)	(2,723)
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Less Than 12 Months Fair Value	10,326	210,128
Less Than 12 Months Unrealized Losses	(107)	(22,209)
12 Months or Longer Fair Value	$ 554,514	$ 377,418
Total Number of Securities | security	152	148
12 Months or Longer Unrealized Losses	$ (117,561)	$ (104,542)
Total Fair Value	564,840	587,546
Total Unrealized Losses	(117,668)
Debt Securities, Available-for-Sale and Held-to-Maturity, after Allowance for Credit Loss [Abstract]
Less Than 12 Months Fair Value	10,326	230,949
Less Than 12 Months Unrealized Losses	(107)	(24,932)
12 Months or Longer Fair Value	574,685	377,418
12 Months or Longer Unrealized Losses	$ (119,953)	$ (104,542)
Total Number of Securities | security	156	152
Total Fair Value	$ 585,011	$ 608,367
Total Unrealized Losses	$ (120,060)	(129,474)
U.S. government-sponsored mortgage-backed securities
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Total Unrealized Losses		$ (126,751)

Federal Home Loan Bank Stock (D

Federal Home Loan Bank Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank Stock
Capital stock of the FHLB owned	$ 12,192	$ 8,197
Territorial Savings Bank
Federal Home Loan Bank Stock
Capital stock of the FHLB owned	$ 12,200,000	$ 8,200,000

Federal Reserve Bank Stock (Det

Federal Reserve Bank Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Federal Reserve Bank Stock
Capital stock of the Federal Reserve Bank owned	$ 3,180	$ 3,170
Territorial Savings Bank
Federal Reserve Bank Stock
Capital stock of the Federal Reserve Bank owned	$ 3,200
FRB of San Francisco
Federal Reserve Bank Stock
Requirement to hold shares of capital stock of the Federal Reserve Bank as a percentage of capital and surplus (as a percent)	6%

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total loans	$ 1,310,541
Total loans		$ 1,298,932
Net unearned fees and discounts	(1,989)
Net unearned fees and discounts		(2,136)
Total loans, net of unearned fees and discounts	1,308,552	1,296,796
Total loans, net of unearned fees and discounts		1,296,796
Allowance for credit/loan losses	(5,121)	(2,032)	$ (2,669)
Allowance for credit/loan losses		(2,032)
Loans receivable, net of allowance for credit/loan losses	1,303,431
Loans receivable, net of allowance for credit/loan losses		1,294,764
Construction, Commercial and Other Mortgage Loans
Loans receivable
Allowance for credit/loan losses	(514)	(434)	(435)
Allowance for credit/loan losses		(434)
Home Equity Loans and Lines of Credit
Loans receivable
Allowance for credit/loan losses		(1)	(1)
Allowance for credit/loan losses		(1)
Consumer and other
Loans receivable
Allowance for credit/loan losses	(105)	(75)	(89)
Allowance for credit/loan losses		(75)
Unallocated
Loans receivable
Allowance for credit/loan losses		(259)	$ (330)
Allowance for credit/loan losses		(259)
Real estate loans
Loans receivable
Total loans	1,302,088
Total loans		1,290,335
Real estate loans | One- to four-family residential
Loans receivable
Total loans	1,277,544
Total loans		1,253,558
Real estate loans | Multi-family residential
Loans receivable
Total loans	5,855
Total loans		6,448
Real estate loans | Construction, Commercial and Other Mortgage Loans
Loans receivable
Total loans	11,631
Total loans		23,903
Real estate loans | Home Equity Loans and Lines of Credit
Loans receivable
Total loans	7,058
Total loans		6,426
Other loans
Loans receivable
Total loans	8,453
Total loans		8,597
Other loans | Loans on Deposit Accounts
Loans receivable
Total loans	196
Total loans		216
Other loans | Consumer and other
Loans receivable
Total loans	$ 8,257
Total loans		$ 8,381

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses - Activity in Allowance for Loan Losses by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Activity in allowance for loan losses
Balance, beginning of period	$ 2,032,000	$ 2,669,000
(Reversal of provision) provision for credit losses	(3,000)	(576,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	5,238,000	2,093,000
Charge-offs	(157,000)	(62,000)
Recoveries	40,000	1,000
Net charge-offs	(117,000)	(61,000)
Balance, end of period	5,121,000	2,032,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	2,032,000
(Reversal of provision) provision for loan losses		(576,000)
Balance, end of period		2,032,000
Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	3,209,000
Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of period	1,263,000	1,814,000
(Reversal of provision) provision for credit losses	(110,000)	(551,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	4,546,000	1,263,000
Charge-offs	(75,000)
Recoveries	31,000
Net charge-offs	(44,000)
Balance, end of period	4,502,000	1,263,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	1,263,000
Balance, end of period		1,263,000
Residential Mortgage | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	3,393,000
Construction, Commercial and Other Mortgage Loans
Activity in allowance for loan losses
Balance, beginning of period	434,000	435,000
(Reversal of provision) provision for credit losses	9,000	(1,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	514,000	434,000
Balance, end of period	514,000	434,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	434,000
Balance, end of period		434,000
Construction, Commercial and Other Mortgage Loans | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	71,000
Home Equity Loans and Lines of Credit
Activity in allowance for loan losses
Balance, beginning of period	1,000	1,000
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses		1,000
Balance, end of period		1,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	1,000
Balance, end of period		1,000
Home Equity Loans and Lines of Credit | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	(1,000)
Unallocated
Activity in allowance for loan losses
Balance, beginning of period	259,000	330,000
(Reversal of provision) provision for credit losses		(71,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses		259,000
Balance, end of period		259,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	259,000
Balance, end of period		259,000
Unallocated | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	(259,000)
Consumer and other
Activity in allowance for loan losses
Balance, beginning of period	75,000	89,000
(Reversal of provision) provision for credit losses	98,000	47,000
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	178,000	136,000
Charge-offs	(82,000)	(62,000)
Recoveries	9,000	1,000
Net charge-offs	(73,000)	(61,000)
Balance, end of period	105,000	75,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	75,000
Balance, end of period		$ 75,000
Consumer and other | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	$ 5,000

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Credit Losses - Allowance for Loan Losses and Loans, Net of Unearned Fees and Discounts, by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for loan losses:
Collectively evaluated for impairment		$ 2,032
Total ending allowance balance	$ 5,121	2,032	$ 2,669
Total ending allowance balance		2,032
Loans:
Individually evaluated for impairment		2,715
Collectively evaluated for impairment		1,294,081
Total ending loan balance	1,308,552	1,296,796
Residential Mortgage
Allowance for loan losses:
Collectively evaluated for impairment		1,263
Total ending allowance balance	4,502	1,263	1,814
Total ending allowance balance		1,263
Loans:
Individually evaluated for impairment		2,693
Collectively evaluated for impairment		1,255,300
Total ending loan balance		1,257,993
Construction, Commercial and Other Mortgage Loans
Allowance for loan losses:
Collectively evaluated for impairment		434
Total ending allowance balance	514	434	435
Total ending allowance balance		434
Loans:
Collectively evaluated for impairment		23,775
Total ending loan balance		23,775
Home Equity Loans and Lines of Credit
Allowance for loan losses:
Collectively evaluated for impairment		1
Total ending allowance balance		1	1
Total ending allowance balance		1
Loans:
Individually evaluated for impairment		16
Collectively evaluated for impairment		6,411
Total ending loan balance		6,427
Consumer and other
Allowance for loan losses:
Collectively evaluated for impairment		75
Total ending allowance balance	$ 105	75	89
Total ending allowance balance		75
Loans:
Collectively evaluated for impairment		8,595
Total ending loan balance		8,595
Unallocated
Allowance for loan losses:
Collectively evaluated for impairment		259
Total ending allowance balance		259	$ 330
Total ending allowance balance		259
Loans:
Individually evaluated for impairment		6
Total ending loan balance		$ 6

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses - Impaired Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Impaired Financing Receivable 1 [Line Items]
Charge offs	$ 157	$ 62
Year 2023
Impaired Financing Receivable 1 [Line Items]
Charge offs	79
Year 2019
Impaired Financing Receivable 1 [Line Items]
Charge offs	16
Prior years
Impaired Financing Receivable 1 [Line Items]
Charge offs	62
One- to four-family residential
Impaired Financing Receivable 1 [Line Items]
Charge offs	75
One- to four-family residential | Year 2019
Impaired Financing Receivable 1 [Line Items]
Charge offs	13
One- to four-family residential | Prior years
Impaired Financing Receivable 1 [Line Items]
Charge offs	62
Loans on Deposit Accounts
Impaired Financing Receivable 1 [Line Items]
Charge offs	78
Loans on Deposit Accounts | Year 2023
Impaired Financing Receivable 1 [Line Items]
Charge offs	78
Consumer and other
Impaired Financing Receivable 1 [Line Items]
Charge offs	4
Consumer and other | Year 2023
Impaired Financing Receivable 1 [Line Items]
Charge offs	1
Consumer and other | Year 2019
Impaired Financing Receivable 1 [Line Items]
Charge offs	$ 3

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses - Amortized Cost by Credit Quality Indicator (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Financing Receivable, Recorded Investment, Past Due
2023	$ 91,857
2022	129,581
2021	288,427
2020	183,891
2019	91,470
Prior	515,959
Revolving Loans Amortized Cost Basis	7,367
Total	1,308,552
Commercial
Financing Receivable, Recorded Investment, Past Due
2023	387
2022	353
2021	4,836
2019	203
Prior	856
Revolving Loans Amortized Cost Basis	1,230
Total	7,865
Consumer
Financing Receivable, Recorded Investment, Past Due
2023	275
2022	80
2021	20
2020	4
2019	14
Prior	42
Revolving Loans Amortized Cost Basis	6,137
Total	6,572
Real Estate
Financing Receivable, Recorded Investment, Past Due
2023	91,195
2022	129,148
2021	283,571
2020	183,887
2019	91,253
Prior	515,061
Total	1,294,115
Not Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due
2023	387
2022	353
2021	4,836
2019	203
Prior	856
Revolving Loans Amortized Cost Basis	1,230
Total	7,865
Not Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due
2023	271
2022	80
2021	20
2020	4
2019	14
Prior	42
Revolving Loans Amortized Cost Basis	6,137
Total	6,568
Not Past Due | Real Estate
Financing Receivable, Recorded Investment, Past Due
2023	91,195
2022	129,148
2021	283,571
2020	183,887
2019	91,113
Prior	514,546
Total	1,293,460
30 - 59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due
2023	4
Total	4
30 - 59 Days Past Due | Real Estate
Financing Receivable, Recorded Investment, Past Due
Prior	428
Total	428
90 Days or More Past Due | Real Estate
Financing Receivable, Recorded Investment, Past Due
2019	140
Prior	87
Total	$ 227

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses - Gross Charge offs by Loan Class and Year (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Impaired Financing Receivable 1 [Line Items]
Recorded Investment	$ 2,715
Unpaid Principal Balance	3,245
Average Recorded Investment	2,799
Interest Income Recognized	24
Loans individually evaluated for impairment with a related allowance for loan loss	0
One- to four-family residential
Impaired Financing Receivable 1 [Line Items]
Recorded Investment	2,693
Unpaid Principal Balance	3,209
Average Recorded Investment	2,776
Interest Income Recognized	24
Home equity loans and lines of credit
Impaired Financing Receivable 1 [Line Items]
Recorded Investment	16
Unpaid Principal Balance	30
Average Recorded Investment	17
Consumer and other
Impaired Financing Receivable 1 [Line Items]
Recorded Investment	6
Unpaid Principal Balance	6
Average Recorded Investment	$ 6

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses - Aging of Loans and Accrual Status by Class (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due
Total Loans	$ 1,308,552,000	$ 1,296,796,000
Nonaccrual Loans	2,260,000	2,301,000
One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	1,275,615,000	1,251,554,000
Nonaccrual Loans	2,079,000	2,279,000
Multi-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	5,848,000	6,439,000
Construction, Commercial and Other Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Total Loans	11,570,000	23,775,000
Home equity loans and lines of credit
Financing Receivable, Recorded Investment, Past Due
Total Loans	7,060,000	6,427,000
Nonaccrual Loans	11,000	16,000
Loans on Deposit Accounts
Financing Receivable, Recorded Investment, Past Due
Total Loans	196,000	217,000
Consumer and other
Financing Receivable, Recorded Investment, Past Due
Total Loans	8,263,000	8,384,000
Nonaccrual Loans	170,000	6,000
Not Past Due
Financing Receivable, Recorded Investment, Past Due
Total Loans	1,307,893,000	1,295,816,000
Not Past Due | One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	1,274,960,000	1,250,586,000
Not Past Due | Multi-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	5,848,000	6,439,000
Not Past Due | Construction, Commercial and Other Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Total Loans	11,570,000	23,775,000
Not Past Due | Home equity loans and lines of credit
Financing Receivable, Recorded Investment, Past Due
Total Loans	7,060,000	6,427,000
Not Past Due | Loans on Deposit Accounts
Financing Receivable, Recorded Investment, Past Due
Total Loans	196,000	217,000
Not Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due
Total Loans	8,259,000	8,372,000
Past Due
Financing Receivable, Recorded Investment, Past Due
Total Loans	659,000	980,000
Past Due | One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	655,000	968,000
Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due
Total Loans	4,000	12,000
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Loans	432,000	6,000
30 - 59 Days Past Due | One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	428,000
30 - 59 Days Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due
Total Loans	4,000	6,000
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Loans		409,000
60 - 89 Days Past Due | One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans		409,000
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due
Total Loans	227,000	565,000
90 Days or More Past Due | One- to four-family residential
Financing Receivable, Recorded Investment, Past Due
Total Loans	$ 227,000	559,000
90 Days or More Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due
Total Loans		$ 6,000

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses - Amortized cost basis of loans on nonaccrual status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with a related ACL	$ 1,211
Nonaccrual loans without a related ACL	1,049
Total Nonaccrual Loans	2,260
Total Nonaccrual Loans	2,260	$ 2,301
One- to four-family residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with a related ACL	1,030
Nonaccrual loans without a related ACL	1,049
Total Nonaccrual Loans	2,079
Total Nonaccrual Loans	2,079	2,279
Home equity loans and lines of credit
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with a related ACL	11
Total Nonaccrual Loans	11
Total Nonaccrual Loans	11	16
Consumer and other
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with a related ACL	170
Total Nonaccrual Loans	170
Total Nonaccrual Loans	$ 170	$ 6

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses - Delinquent and Nonaccrual Loans (Details)	12 Months Ended
	Dec. 31, 2023
Loans Receivable and Allowance for Credit Losses
Loan delinquency period that may result in loss	90 days
Loan delinquency period after which an appraisal is obtained of the underlying collateral	4 months

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses - Maui Wildfire (Details)	Dec. 31, 2023 USD ($)	Aug. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable
Total Loans	$ 1,308,552,000		$ 1,296,796,000
Residential real estate | Not impacted by Maui wildfires
Accounts, Notes, Loans and Financing Receivable
Total Loans	18,700,000
Residential real estate | Impacted by Maui wildfires
Accounts, Notes, Loans and Financing Receivable
Number of homes | item		12
Loan paid off	300,000
Total Loans	2,800,000	$ 3,200,000
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Total Loans			1,257,993,000
Home Equity Loans and Lines of Credit
Accounts, Notes, Loans and Financing Receivable
Total Loans			6,427,000
Consumer and other
Accounts, Notes, Loans and Financing Receivable
Total Loans			8,595,000
Unallocated
Accounts, Notes, Loans and Financing Receivable
Total Loans			$ 6,000
Forbearance Program | Residential real estate | Impacted by Maui wildfires
Accounts, Notes, Loans and Financing Receivable
Total Loans	$ 61,000

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Credit Losses - Collateral, Sales, Serviced for Others, Directors and Executive Officers (Details)	12 Months Ended		24 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) loan	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable
Loans serviced for others	$ 33,200,000	$ 36,000,000	$ 33,200,000
Loans serviced for others, securitization for which the company continues to hold the related mortgage-backed securities	19,300,000	20,700,000	$ 19,300,000
Loans serviced for others, amount of contractually specified servicing fees earned	91,000	101,000
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]			Loan And Deposit Services, Fees And Commissions
Loans to directors and executive officers	$ 392,000	414,000	$ 392,000
Mortgage Loans on Real Estate | Maximum
Accounts, Notes, Loans and Financing Receivable
Loan to value ratio (as a percent)	80%		80%
Residential Mortgage Loans Held For Sale
Accounts, Notes, Loans and Financing Receivable
Residential mortgage loans sold, loan amount	$ 827,000	5,400,000
Residential mortgage loans sold, recognized gains		$ (3,000)
Number of nonaccrual loans | loan		0
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Residential mortgage loans sold, recognized gains	$ 10,000

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Credit Losses - Troubled Debt Restructurings (Details)	Dec. 31, 2023 USD ($) loan
Additional disclosures
Real estate owned	$ 0
Residential Mortgage | One- to four-family residential
Additional disclosures
Mortgage loans in process of foreclosure, number of contracts | loan	2
Mortgage loans in process of foreclosure, total value	$ 227,000

Accrued Interest Receivable (De

Accrued Interest Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Components of accrued interest receivable
Accrued interest receivable	$ 6,105	$ 6,115
Loans receivable
Components of accrued interest receivable
Accrued interest receivable	4,585	4,595
Investment securities
Components of accrued interest receivable
Accrued interest receivable	1,441	1,497
Interest-bearing deposits
Components of accrued interest receivable
Accrued interest receivable	$ 79	$ 23

Interest Rate Lock and Forwar_2

Interest Rate Lock and Forward Loan Sale Commitments - Location of Gains and Losses (Details)	24 Months Ended
	Dec. 31, 2023 USD ($)
Interest Rate Lock and Forward Loan Sale Commitments
Gain (loss) related to derivatives	$ 0

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Premises and equipment
Gross	$ 26,747	$ 26,830
Less accumulated depreciation and amortization	(19,783)	(19,494)
Net	6,964	7,336
Construction in progress	221	263
Total	7,185	7,599
Depreciation expense	1,100	1,200
Land
Premises and equipment
Gross	585	585
Buildings and improvements
Premises and equipment
Gross	1,400	1,400
Leasehold improvements
Premises and equipment
Gross	18,053	17,949
Furniture, fixtures and equipment
Premises and equipment
Gross	6,613	6,766
Automobiles
Premises and equipment
Gross	$ 96	$ 130

Deposits (Details)

Deposits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deposit amount
Non-interest bearing	$ 66,757,000	$ 68,095,000
Savings accounts	739,036,000	910,652,000
Certificates of deposit	532,433,000	429,687,000
Money market	3,595,000	5,372,000
Checking and Super NOW	294,783,000	302,346,000
Total	$ 1,636,604,000	$ 1,716,152,000
Interest rate
Savings accounts (as a percent)	0.59%	0.13%
Certificates of deposit (as a percent)	4.11%	2.67%
Money market (as a percent)	0.10%	0.10%
Checking and Super NOW (as a percent)	0.02%	0.02%
Total (as a percent)	1.61%	0.74%
Maturity of certificate of deposit accounts
2022	$ 498,140,000
2023	20,142,000
2024	5,746,000
2025	3,743,000
2026	4,662,000
Total	532,433,000	$ 429,687,000
Interest expense by type of deposit
Savings	2,469,000	949,000
Certificates of deposit and money market	16,956,000	3,914,000
Checking and Super NOW	59,000	62,000
Total	19,484,000	4,925,000
Overdrawn deposit accounts reclassified as loans	169,000	35,000
Directors and executive officer
Interest expense by type of deposit
Deposits	4,500,000	3,900,000
Domestic
Deposit with balances greater than or equal to $250,000
Total	$ 280,100,000	$ 257,900,000

Advances from the Federal Hom_3

Advances from the Federal Home Loan Bank (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank advances
Federal Home Loan Bank stock, at cost	$ 12,192	$ 8,197
Federal Home Loan Bank, Advances, Rolling Maturity
Due within one year	82,000	24,000
Due over 1 year to 2 years	45,000	82,000
Due over 2 years to 3 years	20,000	25,000
Due over 3 years to 4 years	30,000	10,000
Due over 4 years to 5 years	60,000
Due over 5 years to 6 years	5,000
Total	$ 242,000	$ 141,000
Weighted Average Rate
Due within one year (as a percent)	1.40%	1.27%
Due over 1 year to 2 years (as a percent)	2.87%	1.40%
Due over 2 years to 3 years (as a percent)	3.20%	1.58%
Due over 3 years to 4 years (as a percent)	4.24%	1.97%
Due over 4 years to 5 years (as a percent)	4.32%
Due over 5 years to 6 years (as a percent)	4.38%
Total (as a percent)	2.96%	1.45%
FHLB Des Moines
Federal Home Loan Bank advances
Available additional unused FHLB advances	$ 612,600	$ 769,100
Territorial Savings Bank
Federal Home Loan Bank advances
Federal Home Loan Bank stock, at cost	$ 12,200,000	$ 8,200,000
Territorial Savings Bank | FHLB Des Moines
Federal Home Loan Bank advances
Percentage of total assets used to determine maximum line of credit	45%

Advances from the Federal Res_3

Advances from the Federal Reserve Bank (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Due within one year	$ 50,000
Due within one year (Weighted Average Rate)	4.89%

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase - Summary of Repurchase Liability by Maturity (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Securities sold under agreements to repurchase
Repurchase Liability	$ 10,000,000	$ 10,000,000
Weighted Average
Securities sold under agreements to repurchase
Repurchase Liability	1.81	1.81
Over 1 year to 2 years
Securities sold under agreements to repurchase
Repurchase Liability	$ 5,000,000
Over 1 year to 2 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)	1.88%
Over 2 years to 3 years
Securities sold under agreements to repurchase
Repurchase Liability	$ 5,000,000	$ 5,000,000
Over 2 years to 3 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)	1.73%	1.81%
Over 3 years to 4 years
Securities sold under agreements to repurchase
Repurchase Liability		$ 5,000,000
Over 3 years to 4 years | Weighted Average
Securities sold under agreements to repurchase
Rate (as a percent)		1.73%

Securities Sold Under Agreeme_4

Securities Sold Under Agreements to Repurchase - Summary of Securities Pledged (Details) - Maturing Over 90 days $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Securities sold under agreements to repurchase
Carrying Value of Securities	$ 14,230
Fair Value of Securities	12,239
Repurchase Liability	10,000
Amount at Risk	$ 4,230
Weighted Average Months to Maturity	12 months

Offsetting of Financial Liabi_3

Offsetting of Financial Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities sold under agreements to repurchase
Gross Amount of Recognized Liabilities	$ 10,000	$ 10,000
Net Amount of Liabilities Presented in the Balance Sheet	10,000	10,000
Gross amount not offset in the balance sheet
Financial Instruments	$ 10,000	$ 10,000

Income Taxes - Provision and Re

Income Taxes - Provision and Reconciliation to Federal Statutory Corporate Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended		24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023
Current
Federal	$ 1,767	$ 2,911
State	568	1,317
Total current	2,335	4,228
Deferred
Federal	(396)	990
State	(129)	100
Total deferred	(525)	1,090
Total income tax expense	1,810	5,318
Federal statutory corporate tax rate (as a percent)			21%
Reconciliation of tax provision
Income tax expense at statutory rate	1,436	4,510
Income tax effect of:
State income taxes, net of federal income tax benefits	628	1,079
Other tax-exempt income	(179)	(166)
Share-based compensation	12	9
Meal and entertainment expenses	53	49
Non-deductible executive compensation	70	119
Recovery on bank-owned life insurance		(216)
Other	(210)	(66)
Total income tax expense	$ 1,810	$ 5,318
Effective income tax rate (as a percent)	26.47%	24.76%

Income Taxes - Components of In

Income Taxes - Components of Income Taxes Payable (Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Components of income taxes payable (receivable)
Current taxes payable		$ 838
Deferred taxes receivable	$ (2,457)	(1,643)
Income Tax Payable Receivable and Deferred Income Tax Assets, Net	(344)
State
Components of income taxes payable (receivable)
Current taxes payable	588	1,357
Deferred taxes receivable	(1,144)	(936)
Federal
Components of income taxes payable (receivable)
Current taxes (receivable)	(932)	(519)
Deferred taxes receivable	$ (1,313)	$ (707)

Income Taxes - Deferred Tax Com

Income Taxes - Deferred Tax Components (Details) - USD ($) $ in Thousands	24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Hawaii franchise tax	$ 117	$ 377
Allowance for credit/loan losses	1,364	541
Employee benefit plans	2,672	2,714
Equity incentive plan	107	141
Unrealized losses on securities available-for-sale	637	725
Deferred compensation	22	199
Net lease liability	1,312	212
Other	11	16
Total	6,242	4,925
Deferred tax liabilities:
Deferred loan costs	2,665	2,601
Premises and equipment	273	254
FHLB stock dividends	126	125
Prepaid expense	653	226
Premium on loans sold	68	76
Total	3,785	3,282
Net deferred tax assets	$ 2,457	$ 1,643
Federal statutory corporate tax rate (as a percent)	21%
Valuation allowance for deferred tax assets	$ 0

Employee Benefit Plans - Pensio

Employee Benefit Plans - Pension Plan Participants (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2023
Employee benefit plans
Vesting percentage for employees already enrolled with at least five years of service as of effective date of plan change	100%
Minimum service period for employees already enrolled to be 100% vested as of effective date of plan change	5 years
Vesting period if minimum service period for employees already enrolled was not met as of effective date of plan change	5 years
Minimum
Employee benefit plans
Required service period to participate in the plan	1 year

Employee Benefit Plans - Status

Employee Benefit Plans - Status of Pension Plan and SERP (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in projected benefit obligation:
Actuarial (gain) loss		$ (4,800)
Pension Plan
Employee benefit plans
Accumulated benefit obligation at end of year	$ 15,953	15,865
Change in projected benefit obligation:
Benefit obligation at beginning of year	15,866	20,943
Service cost (income)	191	118
Interest cost	822	597
Actuarial (gain) loss	94	(4,802)
Benefits paid	(1,020)	(990)
Benefit obligation at end of year	15,953	15,866
Change in plan assets:
Fair value of plan assets at beginning of year	18,336	23,125
Actual return on plan assets	2,789	(3,799)
Benefits paid	(1,020)	(990)
Fair value of plan assets at end of year	20,105	18,336
Funded status at end of year	4,152	2,470
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	5,968	7,708
Prior service cost	119	124
Accumulated other comprehensive loss, before tax	6,087	7,832	$ 7,530
Pension Plan | Prepaid expenses and other assets
Amounts recognized in the Consolidated Balance Sheets:
Defined benefit plan Prepaid expenses and other assets	4,152	2,470
Supplemental Employee Retirement Plan (SERP)
Employee benefit plans
Accumulated benefit obligation at end of year	9,927	9,947
Change in projected benefit obligation:
Benefit obligation at beginning of year	9,948	9,915
Service cost (income)	(200)	(135)
Interest cost	179	179
Benefits paid		(11)
Benefit obligation at end of year	9,927	9,948
Change in plan assets:
Employer contributions		11
Benefits paid		(11)
Funded status at end of year	(9,927)	(9,948)
Supplemental Employee Retirement Plan (SERP) | Accounts payable and accrued expenses
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses - liability	$ (9,927)	$ (9,948)

Employee Benefit Plans - Change

Employee Benefit Plans - Changes Recognized in Accumulated Other Comprehensive Loss for Pension Plan (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in accumulated other comprehensive loss:
Accumulated other comprehensive loss at beginning of year, before tax	$ 7,832	$ 7,530
Actuarial net (gain) loss arising during the period	(1,503)	517
Amortizations (recognized in net periodic benefit cost):
Actuarial loss	(237)	(210)
Prior service cost	(5)	(5)
Total recognized in other comprehensive loss	(1,745)	302
Accumulated other comprehensive loss at end of year, before tax	$ 6,087	$ 7,832

Employee Benefit Plans - Assump

Employee Benefit Plans - Assumptions Used to Determine Benefit Obligations and Pension Plan Investment Strategy (Details)	Dec. 31, 2023	Dec. 31, 2022
Pension Plan
Weighted average assumptions used to determine the year-end benefit obligations
Discount rate (as a percent)	5.10%	5.40%
Pension Plan | Domestic equity securities
Normal target allocation
Normal target allocation (as a percent)	55%
Pension Plan | International equity securities
Normal target allocation
Normal target allocation (as a percent)	10%
Pension Plan | Bonds
Normal target allocation
Normal target allocation (as a percent)	35%
Supplemental Employee Retirement Plan (SERP)
Weighted average assumptions used to determine the year-end benefit obligations
Discount rate (as a percent)	5%	5%
Rate of compensation increase (as a percent)	5%	5%

Employee Benefit Plans - Pens_2

Employee Benefit Plans - Pension Plan Assets Measured at Fair Value (Details) - Pension Plan - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets measured at fair values
Fair value of assets	$ 20,105	$ 18,336	$ 23,125
Cash
Assets measured at fair values
Fair value of assets	622	1,452
Equities
Assets measured at fair values
Fair value of assets	13,742	11,659
Mutual funds
Assets measured at fair values
Fair value of assets	5,741	5,225
Level 1
Assets measured at fair values
Fair value of assets	20,105	18,336
Level 1 | Cash
Assets measured at fair values
Fair value of assets	622	1,452
Level 1 | Equities
Assets measured at fair values
Fair value of assets	13,742	11,659
Level 1 | Mutual funds
Assets measured at fair values
Fair value of assets	$ 5,741	$ 5,225

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	12 Months Ended		24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023
Net periodic benefit cost (income) for the year:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]			Noninterest Income, Other Operating Income
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Noninterest Income, Other Operating Income
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]			Noninterest Income, Other Operating Income
Recognized actuarial loss	$ 95,000
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Noninterest Income, Other Operating Income
Pension Plan
Estimated future benefit payments
2022	1,001,000		$ 1,001,000
2023	1,122,000		1,122,000
2024	1,195,000		1,195,000
2025	1,216,000		1,216,000
2026	1,224,000		1,224,000
2027 - 2031	6,017,000		6,017,000
Total	$ 11,775,000		11,775,000
Assumptions used to determine the net periodic benefit cost:
Discount rate (as a percent)	5.40%	2.90%
Expected return on plan assets (as a percent)	6.75%	6.75%
Net periodic benefit cost (income) for the year:
Service cost (income)	$ 191,000	$ 118,000
Interest cost	822,000	597,000
Expected return on plan assets	(1,192,000)	(1,520,000)
Amortization of prior service cost	5,000	5,000
Recognized actuarial loss	237,000	210,000
Net periodic benefit cost	63,000	$ (590,000)
Supplemental Employee Retirement Plan (SERP)
Estimated future benefit payments
2022	319,000		319,000
2023	8,696,000		8,696,000
2024	95,000		95,000
2025	95,000		95,000
2026	95,000		95,000
2027 - 2031	473,000		473,000
Total	$ 9,773,000		$ 9,773,000
Assumptions used to determine the net periodic benefit cost:
Discount rate (as a percent)	5%	5%
Rate of compensation increase (as a percent)	5%	5%
Net periodic benefit cost (income) for the year:
Service cost (income)	$ (200,000)	$ (135,000)
Interest cost	179,000	179,000
Net periodic benefit cost	$ (21,000)	$ 44,000

Employee Benefit Plans - Define

Employee Benefit Plans - Defined Contribution and Profit Sharing Plans (Details) - USD ($)	12 Months Ended	24 Months Ended
	Dec. 31, 2023	Dec. 31, 2023
Defined Contribution Plan Disclosure [Line Items]
Required service period to participate in plans	1 year
401(k) plan
Defined Contribution Plan Disclosure [Line Items]
Company matching contribution of employees' contributions (as a percent)		5%
Employer's matching contribution (in dollars)		$ 64,000
Profit sharing plan
Defined Contribution Plan Disclosure [Line Items]
Employer's matching contribution (in dollars)		$ 0

Employee Stock Ownership Plan -

Employee Stock Ownership Plan - Loan, Expense and Shares (Details) - USD ($)		12 Months Ended
	Jan. 01, 2009	Dec. 31, 2023	Dec. 31, 2022
Employee Stock Ownership Plan
Allocated shares		619,938	583,474
Unearned shares		244,665	293,598
Total ESOP shares		864,603	877,072
Fair value of unearned shares, in thousands		$ 2,728,000	$ 7,049,000
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%
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		$ 692,000	$ 1,100,000
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 - Nonqualified ESOP Restoration Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
ESOP restoration | Certain executives
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits
Accrued (reversed) benefits	$ 13,000	$ 144,000

Share-Based Compensation - Plan

Share-Based Compensation - Plan Provisions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation
Compensation expense	$ 177	$ 480
Income tax benefit	$ 48	$ 131
2010 Equity Incentive Plan | Vesting period one
Share-Based Compensation
Vesting period	3 years
2019 Equity Incentive Plan
Share-Based Compensation
Shares remaining available for new awards under the 2019 Equity Plan	42,680

Share-Based Compensation - Stoc

Share-Based Compensation - Stock Option Activity (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Common Stock
Stock option activity
Exercised (in shares)	(257,192)	(272,211)

Share-Based Compensation - Rest

Share-Based Compensation - Restricted Stock Awards (Details) - USD ($)		12 Months Ended
	Apr. 04, 2022	Dec. 31, 2023	Dec. 31, 2022
2019 Equity Incentive Plan
Unrecognized compensation
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		42,680
Restricted Stock
Restricted Stock Awards
Unvested at beginning of period (in shares)		23,664	23,208
Granted (in shares)		14,803	12,013
Vested (in shares)		12,729	11,557
Unvested at end of period (in shares)		25,738	23,664
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)		$ 24.15	$ 24.61
Granted (in dollars per share)		19.29	23.77
Vested (in dollars per share)		23.64	24.68
Unvested at end of period (in dollars per share)		$ 21.61	$ 24.15
Restricted Stock | 2019 Equity Incentive Plan
Restricted Stock Awards
Granted (in shares)		14,803
Unrecognized compensation
Vesting period		3 years
Unrecognized compensation costs		$ 359,000
Unrecognized compensation costs, period of recognition		1 year 9 months 18 days
Restricted Stock Units Based on a Performance Condition
Restricted Stock Awards
Unvested at beginning of period (in shares)		43,557	41,583
Granted (in shares)		17,758	14,412
Vested (in shares)			7,670
Forfeited (in shares)		16,348	4,768
Unvested at end of period (in shares)		44,967	43,557
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)		$ 23.63	$ 24.68
Granted (in dollars per share)		19.29	23.77
Vested (in dollars per share)			27.30
Forfeited (in dollars per share)		21.05	27.30
Unvested at end of period (in dollars per share)		$ 22.85	$ 23.63
Restricted Stock Units Based on a Performance Condition | 2019 Equity Incentive Plan
Restricted Stock Awards
Granted (in shares)		17,758
Unrecognized compensation
Vesting period		3 years
Unrecognized compensation costs, period of recognition		1 year 7 months 6 days
Restricted Stock Units Based on a Performance Condition | Minimum | 2019 Equity Incentive Plan
Unrecognized compensation
Shares vesting as a percentage of target		0%
Restricted Stock Units Based on a Performance Condition | Maximum | 2019 Equity Incentive Plan
Unrecognized compensation
Shares vesting as a percentage of target		150%
Restricted Stock Units Based on a Market Condition
Restricted Stock Awards
Unvested at beginning of period (in shares)		10,889	10,396
Granted (in shares)		4,443	3,603
Forfeited (in shares)		4,087	3,110
Unvested at end of period (in shares)		11,245	10,889
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)		$ 24.04	$ 24.03
Granted (in dollars per share)		17.95	24.42
Forfeited (in dollars per share)		22.16	24.45
Unvested at end of period (in dollars per share)		$ 22.31	24.04
Assumptions used in the Monte Carlo valuation of PRSUs
Term used for risk-free rate	2 years 9 months
Term used for risk-free rate and historical volatility	2 years 9 months
Risk-free interest rate (as a percent)	3.79%
Closing stock price (in dollars per share)	$ 19.29		$ 24.01
Annualized volatility (as a percent)	26.10%
Restricted Stock Units Based on a Market Condition | 2019 Equity Incentive Plan
Restricted Stock Awards
Granted (in shares)		4,443
Unrecognized compensation
Vesting period		3 years
Unrecognized compensation costs		$ 60,000
Unrecognized compensation costs, period of recognition		1 year 7 months 6 days
Performance Based Restricted Stock Units (PRSUs) | Maximum
Unrecognized compensation
Unrecognized compensation costs		$ 685,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share
Net Income (Loss)	$ 5,027	$ 16,156
Income allotted to participating securities	(48)	(98)
Net income available to common shareholders	$ 4,979	$ 16,058
Weighted-average number of shares used in:
Basic earnings per share (in shares)	8,636,495	8,865,946
Dilutive common stock equivalents:
Stock options and restricted stock units (in shares)	47,597	54,768
Diluted earnings per share (in shares)	8,684,092	8,920,714
Net income per common share, basic (in dollars per share)	$ 0.58	$ 1.81
Net income per common share, diluted (in dollars per share)	$ 0.57	$ 1.80

Other Comprehensive Loss - Chan

Other Comprehensive Loss - Changes in Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in the components of accumulated other comprehensive loss, net of taxes
Balances at beginning of period	$ (256,550)	$ (256,322)
Other comprehensive (income) loss, net of taxes	(1,523)	2,220
Net current period other comprehensive (income) loss	(1,523)	2,220
Balances at end of period	(251,086)	(256,550)
Accumulated Other Comprehensive (Loss)/Income
Changes in the components of accumulated other comprehensive loss, net of taxes
Balances at beginning of period	7,744	5,524
Other comprehensive (income) loss, net of taxes	(1,523)	2,220
Net current period other comprehensive (income) loss	(1,523)	2,220
Balances at end of period	6,221	7,744
Unfunded Pension Liability
Changes in the components of accumulated other comprehensive loss, net of taxes
Balances at beginning of period	5,746	5,524
Other comprehensive (income) loss, net of taxes	(1,280)	222
Net current period other comprehensive (income) loss	(1,280)	222
Balances at end of period	4,466	5,746
Unrealized (Gain) / Loss on Securities
Changes in the components of accumulated other comprehensive loss, net of taxes
Balances at beginning of period	1,998
Other comprehensive (income) loss, net of taxes	(243)	1,998
Net current period other comprehensive (income) loss	(243)	1,998
Balances at end of period	$ 1,755	$ 1,998

Other Comprehensive Loss - Tax

Other Comprehensive Loss - Tax Effect on Each Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Tax effect on each component of other comprehensive loss
Pretax amount	$ (2,076)	$ 3,025
Tax	553	(805)
After Tax Amount	(1,523)	2,220
Unfunded Pension Liability
Tax effect on each component of other comprehensive loss
Pretax amount	(1,745)	302
Tax	465	(80)
After Tax Amount	(1,280)	222
Unrealized (Gain) / Loss on Securities
Tax effect on each component of other comprehensive loss
Pretax amount	(331)	2,723
Tax	88	(725)
After Tax Amount	$ (243)	$ 1,998

Commitments - Loans (Details)

Commitments - Loans (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loan Commitments
Reserve balances	$ 0
Commitments to originate loans
Loan Commitments
Commitment amount	$ 1.3	$ 1.2
Commitments to originate loans | Minimum
Loan Commitments
Interest rate (as a percent)	6.75%	5.25%
Commitments to originate loans | Maximum
Loan Commitments
Interest rate (as a percent)	7.125%	5.50%
Unused lines of credit to borrowers
Loan Commitments
Commitment amount	$ 14.9	$ 14.4

Regulatory Capital and Superv_3

Regulatory Capital and Supervision (Details) $ in Thousands	24 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)
Total Risk-Based Capital
Number of conditions or events that have changed the institution's category under capital guidelines | item	0
Territorial Savings Bank
Regulatory capital and supervision
Minimum capital conservation buffer	0.0250
Tier 1 Leverage Capital
Required Ratio	0.0500	0.0500
Actual Amount	$ 238,972	$ 235,408
Actual Ratio	0.1087	0.1109
Common Equity Tier 1 Risk-Based Capital
Required Ratio	9%	9%
Actual Amount	$ 238,972	$ 235,408
Actual Ratio	26.31%	25.98%
Tier 1 Risk-Based Capital
Required Ratio	0.1050	0.1050
Actual Amount	$ 238,972	$ 235,408
Actual Ratio	0.2598	0.2647
Total Risk-Based Capital
Required Ratio	0.1250	0.1250
Actual Amount	$ 244,093	$ 237,488
Actual Ratio	0.2620	0.2678
Territorial Bancorp Inc.
Regulatory capital and supervision
Threshold of assets requiring consolidated regulatory capital requirements identical to those applicable to subsidiary depository institutions	$ 3,000,000
Tier 1 Leverage Capital
Actual Amount	$ 257,307	$ 264,295
Actual Ratio	0.1221	0.1231
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 257,307	$ 264,295
Actual Ratio	28.33%	29.16%
Tier 1 Risk-Based Capital
Actual Amount	$ 257,307	$ 264,295
Actual Ratio	0.2916	0.2940
Total Risk-Based Capital
Actual Amount	$ 262,428	$ 266,375
Actual Ratio	0.2939	0.2970

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues
Revenue from contracts with customers	$ 1,308	$ 1,497
Other revenue	298	1,923
Total	1,606	3,420
Service and Other Fees
Revenues
Revenue from contracts with customers	1,186	1,276
Other revenue	141	140
Other
Revenues
Revenue from contracts with customers	122	221
Other revenue	157	1,783
Total	$ 279	$ 2,004

Leases - Lease Costs (Details)

Leases - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lease costs:
Operating lease costs	$ 2,757	$ 2,991
Short-term lease costs	511	296
Variable lease costs	163	165
Total lease costs	3,431	3,452
Cash paid for amounts included in measurement of lease liabilities		3,193
Cash paid for amounts included in measurement of lease liabilities	(991)
ROU assets obtained in exchange for new operating lease liabilities	$ 693	$ 7,462

Leases - Future Minimum Rental

Leases - Future Minimum Rental Commitments Under Non-cancellable Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Future minimum rental commitments:
2024	$ 2,818
2025	2,199
2026	2,038
2027	1,961
2026	1,729
Thereafter	9,299
Total	20,044
Less lease incentives to be received in 2023	(729)
Less present value discount	(2,018)
Present value of leases	$ 17,297	$ 15,295

Leases - Other Related Informat

Leases - Other Related Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases
Weighted-average remaining lease term (years)	9 years 9 months 7 days	8 years 10 months 17 days
Weighted-average discount rate	2.15%	2.03%
Rental Income, Nonoperating	$ 155,000	$ 110,000

Fair Value - Estimated Fair Val

Fair Value - Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Investment securities available for sale, at fair value	$ 20,171	$ 20,821
Investment securities held to maturity	568,128	591,084
Liabilities
Advances from Federal Reserve Bank	50,000
Carrying Amount
Assets
Cash and cash equivalents	126,659	40,553
Investment securities available for sale, at fair value	20,171	20,821
Investment securities held to maturity	685,728	717,773
Loans receivable, net	1,303,431	1,294,764
FHLB stock	12,192	8,197
FRB stock	3,180	3,170
Accrued interest receivable	6,105	6,115
Liabilities
Deposits	1,636,604	1,716,152
Advances from the Federal Home Loan Bank	242,000	141,000
Advances from Federal Reserve Bank	50,000
Securities sold under agreements to repurchase	10,000	10,000
Accrued interest payable	1,183	701
Estimated Fair Value
Assets
Cash and cash equivalents	126,659	40,553
Investment securities available for sale, at fair value	20,171	20,821
Investment securities held to maturity	568,128	591,084
Loans receivable, net	1,120,704	1,180,840
FHLB stock	12,192	8,197
FRB stock	3,180	3,170
Accrued interest receivable	6,105	6,115
Liabilities
Deposits	1,633,164	1,708,612
Advances from the Federal Home Loan Bank	238,380	133,145
Advances from Federal Reserve Bank	50,049
Securities sold under agreements to repurchase	9,700	9,440
Accrued interest payable	1,183	701
Estimated Fair Value | Level 1
Assets
Cash and cash equivalents	126,659	40,553
Accrued interest receivable	79	23
Estimated Fair Value | Level 2
Assets
Investment securities available for sale, at fair value	20,171	20,821
Investment securities held to maturity	568,128	591,084
FHLB stock	12,192	8,197
FRB stock	3,180	3,170
Accrued interest receivable	1,441	1,497
Liabilities
Deposits	1,104,171	1,286,465
Advances from the Federal Home Loan Bank	238,380	133,145
Advances from Federal Reserve Bank	50,049
Securities sold under agreements to repurchase	9,700	9,440
Accrued interest payable	157	33
Estimated Fair Value | Level 3
Assets
Loans receivable, net	1,120,704	1,180,840
Accrued interest receivable	4,585	4,595
Liabilities
Deposits	528,993	422,147
Accrued interest payable	$ 1,026	$ 668

Fair Value - Recurring Basis (D

Fair Value - Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets and Liabilities Measured at Fair Value on Recurring Basis
Investment securities available for sale, at fair value	$ 20,171	$ 20,821
Fair Value, Measurements, Recurring
Assets and Liabilities Measured at Fair Value on Recurring Basis
Investment securities available for sale, at fair value	20,171	20,821
Fair Value, Measurements, Recurring | Level 2
Assets and Liabilities Measured at Fair Value on Recurring Basis
Investment securities available for sale, at fair value	$ 20,171	$ 20,821

Parent Company Only - Condensed

Parent Company Only - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Prepaid expenses and other assets	$ 8,211	$ 6,676
Total assets	2,236,672	2,169,592
Liabilities and Equity
Equity	251,086	256,550	$ 256,322
Total liabilities and stockholders' equity	2,236,672	2,169,592
Territorial Bancorp Inc.
Assets
Cash	18,453	28,515
Investment in Territorial Savings Bank	232,751	227,663
Prepaid expenses and other assets	272	105
Total assets	251,476	256,691
Liabilities and Equity
Other liabilities	390	141
Equity	251,086	256,550
Total liabilities and stockholders' equity	$ 251,476	256,691
Territorial Bancorp Inc. | Territorial Savings Bank
Assets
Receivable from Territorial Savings Bank		$ 408

Parent Company Only - Condens_2

Parent Company Only - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Interest and dividend income:
Total interest income	$ 69,088	$ 62,702
Noninterest expense:
Salaries	20,832	22,259
Other general and administrative expenses	4,388	4,252
Total noninterest expense	38,268	38,798
Income before income taxes	6,837	21,474
Income taxes	1,810	5,318
Net income	5,027	16,156
Territorial Bancorp Inc.
Interest and dividend income:
Dividends from Territorial Savings Bank		17,500
Total interest income	4	17,504
Noninterest expense:
Salaries	42	42
Other general and administrative expenses	958	656
Total noninterest expense	1,000	698
Income before income taxes	(996)	16,806
Income taxes	(315)	(209)
Income before equity in undistributed earnings in subsidiaries	(681)	17,015
Equity in undistributed earnings of Territorial Savings Bank, net of dividends	5,708	(859)
Net income	5,027	16,156
Territorial Bancorp Inc. | Territorial Savings Bank
Interest and dividend income:
Interest-earning deposit with Territorial Savings Bank	$ 4	$ 4

Parent Company Only - Condens_3

Parent Company Only - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 5,027	$ 16,156
Adjustments to reconcile net income to net cash provided by operating activities:
Net decrease in prepaid expenses and other assets	(1,537)	289
Net cash used in operating activities	8,257	16,666
Cash flows from investing activities:
Net cash provided by (used in) investing activities	16,874	(95,252)
Cash flows from financing activities:
Repurchases of common stock	(4,065)	(5,973)
Cash dividends paid	(6,412)	(9,071)
Net cash provided by (used in) financing activities	60,975	19,280
Net change in cash and cash equivalents	86,106	(59,306)
Cash and cash equivalents at beginning of the year	40,553	99,859
Cash and cash equivalents at end of the year	126,659	40,553
Territorial Bancorp Inc.
Cash flows from operating activities:
Net income	5,027	16,156
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of Territorial Savings Bank, net of dividends	(5,708)	859
Net decrease in prepaid expenses and other assets	933	1,275
Net decrease in other liabilities	163	(263)
Net cash used in operating activities	415	18,027
Cash flows from financing activities:
Repurchases of common stock	(4,065)	(5,973)
Cash dividends paid	(6,412)	(9,071)
Net cash provided by (used in) financing activities	(10,477)	(15,044)
Net change in cash and cash equivalents	(10,062)	2,983
Cash and cash equivalents at beginning of the year	28,515	25,532
Cash and cash equivalents at end of the year	$ 18,453	$ 28,515

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares		12 Months Ended
	Jan. 26, 2024	Dec. 31, 2023	Dec. 31, 2022
Subsequent Events
Quarterly cash dividend declared on common stock (in dollars per share)		$ 0.74	$ 1.02
Subsequent event
Subsequent Events
Quarterly cash dividend declared on common stock (in dollars per share)	$ 0.05

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 5,027	$ 16,156

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false