First Northwest Bancorp (FNWB) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 02, 2018
Document Information [Abstract]
Entity Registrant Name	First Northwest Bancorp
Entity Central Index Key	1,556,727
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2,018
Common Stock, Shares Outstanding		11,577,394

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 13,209	$ 13,777
Interest-bearing deposits in banks	11,941	23,024
Investment securities available for sale, at fair value	258,218	290,242
Investment securities held to maturity, at amortized cost	47,709	50,126
Loans held for sale	0	788
Loans receivable (net of allowance for loan losses of $8,984 and $8,760)	798,828	779,111
Federal Home Loan Bank (FHLB) stock, at cost	6,389	7,023
Accrued interest receivable	3,641	3,745
Premises and equipment, net	14,361	13,739
Mortgage servicing rights, net	1,104	1,095
Bank-owned life insurance, net	28,873	28,724
Prepaid expenses and other assets	5,312	4,265
Total assets	1,189,585	1,215,659
LIABILITIES AND SHAREHOLDERS' EQUITY
Deposits	880,622	885,032
Borrowings	122,949	144,100
Accrued interest payable	210	325
Accrued expenses and other liabilities	10,172	7,929
Advances from borrowers for taxes and insurance	2,130	1,228
Total liabilities	1,016,083	1,038,614
Shareholders' Equity
Preferred stock, $0.01 par value, authorized 5,000,000 shares, no shares issued or outstanding	0	0
Common stock, $0.01 par value, authorized 75,000,000 shares; issued and outstanding 11,577,394 shares at March 31, 2018, and 11,785,507 shares at December 31, 2017	116	118
Additional paid-in capital	109,354	111,106
Retained earnings	78,822	78,602
Accumulated other comprehensive loss, net of tax	(3,747)	(1,573)
Unearned employee stock ownership plan (ESOP) shares	(11,043)	(11,208)
Total shareholders' equity	173,502	177,045
Total liabilities and shareholders' equity	$ 1,189,585	$ 1,215,659

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 8,984	$ 8,760
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	11,577,394	11,785,507
Common stock, shares outstanding (in shares)	11,577,394	11,785,507

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Interest and fees on loans receivable	$ 8,583	$ 7,479
Interest on mortgage-backed securities	1,297	1,298
Interest on investment securities	862	580
Interest on deposits and other	45	21
FHLB dividends	59	30
Total interest income	10,846	9,408
INTEREST EXPENSE
Deposits	985	718
Borrowings	889	585
Total interest expense	1,874	1,303
Net interest income	8,972	8,105
PROVISION FOR LOAN LOSSES	310	215
Net interest income after provision for loan losses	8,662	7,890
NONINTEREST INCOME
Loan and deposit service fees	893	821
Mortgage servicing fees, net of amortization	62	69
Net gain on sale of loans	167	284
Net gain on sale of investment securities	122	0
Increase in cash surrender value of bank-owned life insurance	149	178
Income from death benefit on bank-owned life insurance, net	0	768
Other income	89	81
Total noninterest income	1,482	2,201
NONINTEREST EXPENSE
Compensation and benefits	4,811	4,530
Real estate owned and repossessed assets expense (income), net	8	(50)
Data processing	628	597
Occupancy and equipment	1,102	985
Supplies, postage, and telephone	231	198
Regulatory assessments and state taxes	126	133
Advertising	324	179
Professional fees	322	371
FDIC insurance premium	76	54
Other	647	501
Total noninterest expense	8,275	7,498
INCOME BEFORE PROVISION FOR INCOME TAXES	1,869	2,593
PROVISION FOR INCOME TAXES	346	429
NET INCOME	$ 1,523	$ 2,164
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.20
Diluted earnings per share (in dollars per share)	$ 0.14	$ 0.20

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 1,523	$ 2,164
Unrealized (loss) gain on securities:
Unrealized holding (loss) gain, net of tax (benefit) provision of $(551) and $133, respectively	(2,078)	257
Reclassification adjustment for net gains on sales of securities realized in income, net of taxes of $(26) and $0, respectively	(96)	0
Other comprehensive (loss) income, net of tax	(2,174)	257
COMPREHENSIVE (LOSS) INCOME	$ (651)	$ 2,421

Consolidated Statements of Com6

Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Unrealized holding gain (loss), tax	$ (551)	$ 133
Reclassification Adjustments, tax	$ (26)	$ 0

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Unearned ESOP Shares	Accumulated Other Comprehensive (Loss) Income, Net of Tax
Shares, beginning balance (in shares) at Dec. 31, 2016		12,153,946
Beginning balance at Dec. 31, 2016	$ 176,892	$ 122	$ 114,021	$ 75,833	$ (11,847)	$ (1,237)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,164			2,164
Common stock repurchased (in shares)		(76,100)
Common stock repurchased	(1,196)	$ (1)	(760)	(435)
Other comprehensive income (loss), net of tax	257					257
Share-based compensation	217		217
ESOP shares committed to be released	203		39		164
Shares, ending balance (in shares) at Mar. 31, 2017		12,077,846
Ending balance at Mar. 31, 2017	$ 178,537	$ 121	113,517	77,562	(11,683)	(980)
Shares, beginning balance (in shares) at Dec. 31, 2017	11,785,507	11,785,507
Beginning balance at Dec. 31, 2017	$ 177,045	$ 118	111,106	78,602	(11,208)	(1,573)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,523			1,523
Common stock repurchased (in shares)		(208,113)
Common stock repurchased	(3,385)	$ (2)	(2,080)	(1,303)
Other comprehensive income (loss), net of tax	(2,174)					(2,174)
Share-based compensation	273		273
ESOP shares committed to be released	$ 220		55		165
Shares, ending balance (in shares) at Mar. 31, 2018	11,577,394	11,577,394
Ending balance at Mar. 31, 2018	$ 173,502	$ 116	$ 109,354	$ 78,822	$ (11,043)	$ (3,747)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,523	$ 2,164
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	332	322
Amortization and accretion of premiums and discounts on investments, net	496	248
Accretion of deferred loan fees, net	(49)	(11)
Amortization of mortgage servicing rights, net	47	48
Additions to mortgage servicing rights, net	(56)	(58)
Provision for loan losses	310	215
Deferred federal income taxes	(350)	492
Allocation of ESOP shares	220	203
Share-based compensation	273	217
Gain on sale of loans, net	(167)	(284)
Gain on sale of securities available for sale, net	(122)	0
Increase in cash surrender value of life insurance, net	(149)	(178)
Income from death benefit on bank-owned life insurance, net	0	(768)
Origination of loans held for sale	(5,640)	(6,491)
Proceeds from loans held for sale	6,595	6,614
Change in assets and liabilities:
Decrease (increase) in accrued interest receivable	104	(65)
Increase in prepaid expenses and other assets	(117)	(486)
Decrease in accrued interest payable	(115)	(9)
Increase in accrued expenses and other liabilities	2,243	801
Net cash from operating activities	5,378	2,974
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities available for sale	(12,935)	(35,769)
Proceeds from maturities, calls, and principal repayments of securities available for sale	9,077	15,552
Proceeds from sales of securities available for sale	32,859	0
Proceeds from maturities, calls, and principal repayments of securities held to maturity	2,315	892
Redemption (purchase) of FHLB stock	634	(942)
Proceeds from sale of real estate owned and repossessed assets	31	164
Net increase in loans receivable	(20,012)	(16,023)
Purchase of premises and equipment, net	(954)	(163)
Net cash from investing activities	11,015	(36,289)
CASH FLOWS FROM FINANCING ACTIVITIES
Net (decrease) increase in deposits	(4,410)	13,643
Proceeds from FHLB advances	173,095	92,463
Repayment of FHLB advances	(194,246)	(71,793)
Net increase in advances from borrowers for taxes and insurance	902	737
Repurchase of common stock	(3,385)	(1,196)
Net cash from financing activities	(28,044)	33,854
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(11,651)	539
CASH AND CASH EQUIVALENTS, beginning of period	36,801	22,649
CASH AND CASH EQUIVALENTS, end of period	25,150	23,188
Cash paid during the year for:
Interest on deposits and borrowings	1,989	1,312
Income taxes	0	525
NONCASH INVESTING ACTIVITIES
Unrealized (loss) gain on securities available for sale	(2,751)	391
Loans transferred to real estate owned and repossessed assets, net of deferred loan fees and allowance for loan losses	$ 34	$ 9

Basis of Presentation and Criti

Basis of Presentation and Critical Accounting Policies	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Critical Accounting Policies	Basis of Presentation and Critical Accounting Policies Organization and Nature of business - First Northwest Bancorp, a Washington corporation, became the holding company of First Federal Savings and Loan Association of Port Angeles on January 29, 2015, upon completion of the Bank's conversion from a mutual to stock form of organization (the "Conversion"). In connection with the Conversion, the Company issued an aggregate of 12,167,000 shares of common stock at an offering price of $10.00 per share for gross proceeds of $121.7 million . An additional 933,360 shares of Company common stock and $400,000 in cash were contributed to the First Federal Community Foundation ("Foundation"), a charitable foundation that was established in connection with the Conversion, resulting in the issuance of a total of 13,100,360 shares. The Company received $117.6 million in net proceeds from the stock offering of which $58.4 million were contributed to the Bank upon Conversion. Pursuant to the Bank's Plan of Conversion (the "Plan") adopted by its Board of Directors, and as approved by its members, the Company established an employee stock ownership plan ("ESOP"). On December 18, 2015, the ESOP completed its open market purchases, with funds borrowed from the Company, of 8% of the common stock issued in the Conversion for a total of 1,048,029 shares. First Northwest's business activities generally are limited to passive investment activities and oversight of its investment in First Federal. Accordingly, the information set forth in this report, including the consolidated unaudited financial statements and related data, relates primarily to the Bank. The Bank is a community-oriented financial institution providing commercial and consumer banking services to individuals and businesses in Western Washington State with offices in Clallam, Jefferson, Kitsap, and Whatcom counties. These services include deposit and lending transactions that are supplemented with borrowing and investing activities. Basis of presentation - The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Accordingly, they do not include all of the information and footnotes required by U.S. Generally Accepted Accounting Principles ("GAAP") for complete financial statements. These unaudited interim consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes included in the Company's Annual Report on Form 10-KT for the six months ended December 31, 2017 . In our opinion, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation of the consolidated financial statements in accordance with GAAP have been included. The Company changed its fiscal year from June 30 to December 31 effective December 31, 2017. Operating results for the three months ended March 31, 2018 , are not necessarily indicative of the results that may be expected for future periods. In preparing the unaudited interim consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to a determination of the allowance for loan losses ("ALLL"), mortgage servicing rights, fair value of financial instruments, deferred tax assets and liabilities, and the valuation of impaired loans. Principles of consolidation - The accompanying consolidated financial statements include the accounts of First Northwest Bancorp and its wholly owned subsidiary, First Federal. All material intercompany accounts and transactions have been eliminated in consolidation. Subsequent Events - The Company has evaluated subsequent events for potential recognition and disclosure and determined there are no such events or transactions requiring recognition or disclosure. Recently adopted accounting pronouncements - In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) . In August 2015, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , which postponed the effective date of 2014-09. Subsequently, in March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations . This amendment clarifies that an entity should determine if it is the principal or the agent for each specified good or service promised in a contract with a customer. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing . The core principle of Topic 606 is that an entity must recognize revenue when it has satisfied a performance obligation of transferring promised goods or services to a customer. In general, the new guidance requires companies to use more judgment and make more estimates than under current guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. These standards were effective for interim and annual periods beginning after December 15, 2017. The Company has analyzed its revenue sources of noninterest income to determine when the satisfaction of the performance obligation occurs and the appropriate recognition of revenue. The adoption of these ASUs did not have a material impact on the Company’s consolidated financial statements as the Company did not identify any significant changes in the timing of revenue recognition when considering the amended accounting guidance since it is consistent with the Company’s current accounting policy for contracts. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. In addition, the amendments in this ASU require an entity to disclose the fair value of financial instruments using the exit price notion. Exit price is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The amendments in this ASU were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company has used the exit price notion in the fair value disclosure of financial instruments in Note 9 of this report. The adoption of ASU 2016-01 did not have a material impact on the Company’s consolidated financial statements or disclosures in the Notes to the Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The ASU provides specific guidance on eight classification issues in order to achieve more consistent reporting. The amendments in this ASU were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not currently have items on its cash flow statement that were impacted by adoption of this ASU and therefore adoption of ASU 2016-15 did not have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . The ASU shortens the amortization period for certain callable debt securities held at a premium using the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted. The adoption of ASU 2017-08 did not have a material impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting . This ASU provides clarity on the guidance related to stock compensation when there have been changes to the terms or conditions of a share-based payment award to which an entity would be required to apply modification accounting under ASC 718. The ASU provides the three following criteria must be met in order to not account for the effect of the modification of terms or conditions: the fair value, the vesting conditions and the classification as an equity or liability instrument of the modified award is the same as the original award immediately before the original award is modified. The amendments in this ASU were effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The Company has not had any modifications on share-based payment awards and therefore the adoption of ASU 2017-09 did not have a material impact on the Company’s consolidated financial statements. In March 2018, FASB issued ASU No. 2018-05, Income Taxes (Topic 740) . This ASU was issued to provide guidance on the income tax accounting implications of the Tax Cuts and Jobs Act, and allows for entities to report provisional amounts for specific income tax effects of the Act for which the accounting under Topic 740 was not yet complete but a reasonable estimate could be determined. A measurement period of one-year is allowed to complete the accounting effects under Topic 740 and revise any previous estimates reported. Any provisional amounts or subsequent adjustments included in an entity’s financial statements during the measurement period should be included in income from continuing operations as an adjustment to tax expense in the reporting period the amounts are determined. The Company adopted this ASU with the provisional adjustments as reported in the Consolidated Financial Statements on Form 10-KT as of December 31, 2017. As of March 31, 2018, the Company did not incur any adjustments to the provisional recognition. Recently issued accounting pronouncements - In February 2016, the FASB issued ASU No. 2016-02, Leases . ASU 2016-02 is intended to increase transparency and comparability among organizations by requiring the recognition of lease assets and lease liabilities on the balance sheet and disclosure of key information about leasing arrangements. The principal change required by this ASU relates to lessee accounting, and is that for operating leases, a lessee is required to (1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, (2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis, and (3) classify all cash payments within operating activities in the statement of cash flows. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. ASU 2016-02 also changes disclosure requirements related to leasing activities, and requires certain qualitative disclosures along with specific quantitative disclosures. The amendments in ASU 2016-02 are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early application of the amendments in ASU 2016-02 is permitted. The Company is compiling an inventory of all leased assets to determine the impact of ASU 2016-02 on its financial condition and results of operations. Once adopted, we expect to report higher assets and liabilities on our Consolidated Balance Sheets as a result of including right-of-use assets and lease liabilities related to certain banking offices and certain equipment under noncancelable operating lease agreements, which currently are not reflected in our Consolidated Balance Sheets. We do not expect the guidance to have a material impact on the Consolidated Statements of Income or Consolidated Statements of Changes in Shareholders' Equity. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Loss , which updates the guidance on recognition and measurement of credit losses for financial assets. The new requirements, known as the current expected credit loss model (CECL) will require entities to adopt an impairment model based on expected losses rather than incurred losses. ASU No. 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Upon adoption, the Company will change processes and procedures to calculate the allowance for loan losses, including changes in assumptions and estimates to consider expected credit losses over the life of the loan versus the current accounting practice that utilizes the incurred loss model. In addition, the current accounting policy and procedures for other-than-temporary impairment on investment securities available for sale will be replaced with an allowance approach. At this time, we do not anticipate an increase to the ALLL as a result of the implementation of this ASU based on the preliminary review and testing of different models being evaluated. The Company has formed an internal project management team which will coordinate and monitor implementation progress, work with our third-party vendor, and implement changes to processes and procedures to ensure the Company is fully compliant with the amendments at the adoption date. In August 2017, FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815). This ASU was issued to provide investors better insight to an entity’s risk management hedging strategies by permitting companies to recognize the economic results of its hedging strategies in its financial statements. The amendments in this ASU permit hedge accounting for hedging relationships involving nonfinancial risk and interest rate risk by removing certain limitations in cash flow and fair value hedging relationships. In addition, the ASU requires an entity to present the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported. This ASU is effective for fiscal years beginning after December 15, 2018, and early adoption is permitted. Adoption of ASU 2017-12 is not expected to have a material impact on the Company’s consolidated financial statements. Reclassifications - Certain amounts in the unaudited interim consolidated financial statements for prior periods have been reclassified to conform to the current unaudited financial statement presentation with no effect on net income or shareholders' equity.

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale and held-to-maturity at March 31, 2018 , are summarized as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In thousands) Available for Sale Municipal bonds $ 10,523 $ 124 $ (23 ) $ 10,624 U.S. government agency issued asset-backed securities (ABS agency) 16,266 22 (199 ) 16,089 Corporate issued asset-backed securities (ABS corporate) 22,818 — (126 ) 22,692 Corporate issued debt securities (Corporate debt) 9,986 213 (159 ) 10,040 U.S. Small Business Administration securities (SBA) 40,521 53 (225 ) 40,349 Mortgage-backed securities: U.S. government agency issued mortgage-backed securities (MBS agency) 144,359 12 (4,199 ) 140,172 Corporate issued mortgage-backed securities (MBS corporate) 18,520 14 (282 ) 18,252 Total securities available for sale $ 262,993 $ 438 $ (5,213 ) $ 258,218 Held to Maturity Municipal bonds $ 12,121 $ 114 $ (6 ) $ 12,229 SBA 368 — (2 ) 366 Mortgage-backed securities: MBS agency 35,220 86 (634 ) 34,672 Total securities held to maturity $ 47,709 $ 200 $ (642 ) $ 47,267 The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale and held-to-maturity at December 31, 2017 , are summarized as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In thousands) Available for Sale Municipal bonds $ 13,058 $ 391 $ (15 ) $ 13,434 ABS agency 21,972 36 (238 ) 21,770 ABS corporate 22,823 — (55 ) 22,768 Corporate debt 19,835 195 (122 ) 19,908 SBA 47,325 98 (149 ) 47,274 Mortgage-backed securities: MBS agency 146,532 36 (2,026 ) 144,542 MBS corporate 20,721 18 (193 ) 20,546 Total securities available for sale $ 292,266 $ 774 $ (2,798 ) $ 290,242 Held to Maturity Municipal bonds $ 13,963 $ 156 $ — $ 14,119 SBA 399 — (4 ) 395 Mortgage-backed securities: MBS agency 35,764 338 (350 ) 35,752 Total securities held to maturity $ 50,126 $ 494 $ (354 ) $ 50,266 The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of March 31, 2018 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (16 ) $ 4,270 $ (7 ) $ 110 $ (23 ) $ 4,380 ABS agency (62 ) 8,856 (137 ) 2,617 (199 ) 11,473 ABS corporate (126 ) 22,692 — — (126 ) 22,692 Corporate debt (159 ) 4,827 — — (159 ) 4,827 SBA (59 ) 7,199 (166 ) 7,268 (225 ) 14,467 Mortgage-backed securities: MBS agency (613 ) 29,138 (3,586 ) 109,328 (4,199 ) 138,466 MBS corporate (88 ) 8,160 (194 ) 6,314 (282 ) 14,474 Total available for sale $ (1,123 ) $ 85,142 $ (4,090 ) $ 125,637 $ (5,213 ) $ 210,779 Held to Maturity Municipal bonds $ — $ 315 $ (6 ) $ 962 $ (6 ) $ 1,277 SBA (2 ) 366 — — (2 ) 366 Mortgage-backed securities: MBS agency (118 ) 13,665 (516 ) 18,163 (634 ) 31,828 Total held to maturity $ (120 ) $ 14,346 $ (522 ) $ 19,125 $ (642 ) $ 33,471 The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of December 31, 2017 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (11 ) $ 4,276 $ (4 ) $ 114 $ (15 ) $ 4,390 ABS agency — — (238 ) 7,294 (238 ) 7,294 ABS corporate (55 ) 22,768 — — (55 ) 22,768 Corporate debt (122 ) 4,864 — — (122 ) 4,864 SBA (45 ) 7,421 (104 ) 8,067 (149 ) 15,488 Mortgage-backed securities: MBS agency (394 ) 57,081 (1,632 ) 85,421 (2,026 ) 142,502 MBS corporate (22 ) 5,808 (171 ) 10,172 (193 ) 15,980 Total available for sale $ (649 ) $ 102,218 $ (2,149 ) $ 111,068 $ (2,798 ) $ 213,286 Held to Maturity SBA $ (4 ) $ 395 $ — $ — $ (4 ) $ 395 Mortgage-backed securities: MBS agency (6 ) 1,001 (344 ) 18,494 (350 ) 19,495 Total held to maturity $ (10 ) $ 1,396 $ (344 ) $ 18,494 $ (354 ) $ 19,890 The Company may hold certain investment securities in an unrealized loss position that are not considered other than temporarily impaired ("OTTI"). At March 31, 2018 and December 31, 2017 , there were 68 and 63 investment securities in an unrealized loss position, respectively. We believe that the unrealized losses on our investment securities relate principally to the general change in interest rates and illiquidity, and not credit quality, that has occurred since the initial purchase, and such unrecognized losses or gains will continue to vary with general interest rate level fluctuations in the future. Certain investments in a loss position are guaranteed by government entities or government sponsored entities. The Company does not intend to sell the securities in an unrealized loss position and believes it is not likely it will be required to sell these investments prior to a market price recovery or maturity. There were no OTTI losses during the three months ended March 31, 2018 and 2017 . The amortized cost and estimated fair value of investment securities by contractual maturity are shown in the following tables at the dates indicated. Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; therefore, these securities are shown separately. March 31, 2018 Available-for-Sale Held-to-Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value (In thousands) Mortgage-backed securities: Due within one year $ — $ — $ — $ — Due after one through five years 7,323 7,102 1,688 1,686 Due after five through ten years 13,023 12,618 2,676 2,603 Due after ten years 142,533 138,704 30,856 30,383 Total mortgage-backed securities 162,879 158,424 35,220 34,672 All other investment securities: Due within one year — — — — Due after one through five years 4,286 4,270 742 751 Due after five through ten years 18,531 18,517 6,904 6,939 Due after ten years 77,297 77,007 4,843 4,905 Total all other investment securities 100,114 99,794 12,489 12,595 Total investment securities $ 262,993 $ 258,218 $ 47,709 $ 47,267 December 31, 2017 Available-for-Sale Held-to-Maturity Amortized Estimated Amortized Estimated (In thousands) Mortgage-backed securities: Due within one year $ — $ — $ — $ — Due after one through five years 7,363 7,260 1,957 1,973 Due after five through ten years 13,337 13,127 2,835 2,792 Due after ten years 146,553 144,701 30,972 30,987 Total mortgage-backed securities 167,253 165,088 35,764 35,752 All other investment securities: Due within one year — — — — Due after one through five years 4,388 4,380 — — Due after five through ten years 29,482 29,661 9,491 9,574 Due after ten years 91,143 91,113 4,871 4,940 Total all other investment securities 125,013 125,154 14,362 14,514 Total investment securities $ 292,266 $ 290,242 $ 50,126 $ 50,266 Sales of securities available-for-sale for the periods shown are summarized as follows: Three Months Ended March 31, 2018 2017 (In thousands) Proceeds from sales $ 32,859 $ — Gross realized gains 164 — Gross realized losses (42 ) —

Loans Receivable

Loans Receivable	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable	Loans Receivable Loans receivable consisted of the following at the dates indicated: March 31, 2018 December 31, 2017 (In thousands) Real Estate: One-to-four family $ 347,453 $ 355,391 Multi-family 68,095 73,767 Commercial real estate 220,542 202,956 Construction and land 75,684 71,145 Total real estate loans 711,774 703,259 Consumer: Home equity 38,538 38,473 Other consumer 39,478 28,106 Total consumer loans 78,016 66,579 Commercial business loans 16,163 16,303 Total loans 805,953 786,141 Less: Net deferred loan fees 501 724 Premium on purchased loans, net (2,360 ) (2,454 ) Allowance for loan losses 8,984 8,760 Total loans receivable, net $ 798,828 $ 779,111 Allowance for Loan Losses. The Company maintains a general allowance for loan losses based on evaluating known and inherent risks in the loan portfolio, including management’s continuing analysis of the factors underlying the quality of the loan portfolio. These factors include changes in the size and composition of the loan portfolio, actual loan loss experience, and current and anticipated economic conditions. The reserve is an estimate based upon factors and trends identified by management at the time the financial statements are prepared. The following tables summarize changes in the ALLL and loan portfolio by segment and impairment method for the periods shown: At or For the Three Months Ended March 31, 2018 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) ALLL: Beginning balance $ 3,061 $ 648 $ 1,847 $ 648 $ 787 $ 712 $ 265 $ 792 $ 8,760 Provision for loan losses 105 (1 ) 206 31 (51 ) 331 444 (755 ) 310 Charge-offs — — — — — (123 ) — — (123 ) Recoveries 1 — — — 8 28 — — 37 Ending balance $ 3,167 $ 647 $ 2,053 $ 679 $ 744 $ 948 $ 709 $ 37 $ 8,984 At March 31, 2018 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) Total ALLL $ 3,167 $ 647 $ 2,053 $ 679 $ 744 $ 948 $ 709 $ 37 $ 8,984 General reserve 3,127 646 1,939 678 737 923 123 37 8,210 Specific reserve 40 1 114 1 7 25 586 — 774 Total loans $ 347,453 $ 68,095 $ 220,542 $ 75,684 $ 38,538 $ 39,478 $ 16,163 $ — $ 805,953 General reserves (1) 343,809 67,981 216,324 71,905 37,913 39,377 15,299 — 792,608 Specific reserves (2) 3,644 114 4,218 3,779 625 101 864 — 13,345 (1) Loans collectively evaluated for general reserves. (2) Loans individually evaluated for specific reserves. At or For the Three Months Ended March 31, 2017 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total ALLL: (In thousands) Beginning balance $ 2,892 $ 370 $ 1,488 $ 585 $ 794 $ 361 $ 652 $ 918 $ 8,060 Provision for loan losses 147 128 184 104 (58 ) 106 495 (891 ) 215 Charge-offs — — — — (79 ) (33 ) — — (112 ) Recoveries 25 — — — 125 14 1 — 165 Ending balance $ 3,064 $ 498 $ 1,672 $ 689 $ 782 $ 448 $ 1,148 $ 27 $ 8,328 At December 31, 2017 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) Total ALLL $ 3,061 $ 648 $ 1,847 $ 648 $ 787 $ 712 $ 265 $ 792 $ 8,760 General reserve 3,014 647 1,719 647 779 703 262 792 8,563 Specific reserve 47 1 128 1 8 9 3 — 197 Total loans $ 355,391 $ 73,767 $ 202,956 $ 71,145 $ 38,473 $ 28,106 $ 16,303 $ — $ 786,141 General reserves (1) 351,545 73,652 201,885 71,093 37,838 28,047 16,020 — 780,080 Specific reserves (2) 3,846 115 1,071 52 635 59 283 — 6,061 (1) Loans collectively evaluated for general reserves. (2) Loans individually evaluated for specific reserves. Impaired loans. A loan is considered impaired when First Federal has determined that it may be unable to collect payments of principal or interest when due under the contractual terms of the loan. In the process of identifying loans as impaired, management takes into consideration factors that include payment history and status, collateral value, financial condition of the borrower, and the probability of collecting scheduled payments in the future. Minor payment delays and insignificant payment shortfalls typically do not result in a loan being classified as impaired. The significance of payment delays and shortfalls is considered by management on a case-by-case basis after taking into consideration the totality of circumstances surrounding the loans and the borrowers, including payment history and amounts of any payment shortfall, length and reason for delay, and likelihood of return to stable performance. Impairment is measured on a loan-by-loan basis for all loans in the portfolio except smaller balance homogeneous loans and certain qualifying troubled debt restructuring ("TDR") loans. The following table presents a summary of loans individually evaluated for impairment by portfolio segment at the dates indicated: March 31, 2018 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance (In thousands) With no allowance recorded: One-to-four family $ 465 $ 523 $ — $ 382 $ 407 $ — Commercial real estate 3,426 3,479 — 256 378 — Construction and land 3,729 3,731 — — 3 — Home equity 358 507 — 365 515 — Other consumer — 177 — — 124 — Commercial business — 4 — — 4 — Total 7,978 8,421 — 1,003 1,431 — With an allowance recorded: One-to-four family 3,179 3,399 40 3,464 3,718 47 Multi-family 114 114 1 115 115 1 Commercial real estate 792 800 114 815 821 128 Construction and land 50 75 1 52 76 1 Home equity 267 335 7 270 338 8 Other consumer 101 110 25 59 67 9 Commercial business 864 864 586 283 283 3 Total 5,367 5,697 774 5,058 5,418 197 Total impaired loans: One-to-four family 3,644 3,922 40 3,846 4,125 47 Multi-family 114 114 1 115 115 1 Commercial real estate 4,218 4,279 114 1,071 1,199 128 Construction and land 3,779 3,806 1 52 79 1 Home equity 625 842 7 635 853 8 Other consumer 101 287 25 59 191 9 Commercial business 864 868 586 283 287 3 Total $ 13,345 $ 14,118 $ 774 $ 6,061 $ 6,849 $ 197 The following table presents the average recorded investment in loans individually evaluated for impairment and the related interest income recognized for the periods shown: Three Months Ended Three Months Ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) With no allowance recorded: One-to-four family $ 408 $ 8 $ 1,512 $ 27 Commercial real estate 2,389 27 310 1 Construction and land 2,487 68 — — Home equity 361 4 301 6 Other consumer — 5 — 1 Total 5,645 112 2,123 35 With an allowance recorded: One-to-four family 3,381 66 4,022 75 Multi-family 114 1 119 1 Commercial real estate 795 10 1,293 17 Construction and land 51 3 9 — Home equity 286 6 376 7 Other consumer 101 2 30 — Commercial business 675 3 338 4 Total 5,403 91 6,187 104 Total impaired loans: One-to-four family 3,789 74 5,534 102 Multi-family 114 1 119 1 Commercial real estate 3,184 37 1,603 18 Construction and land 2,538 71 9 — Home equity 647 10 677 13 Other consumer 101 7 30 1 Commercial business 675 3 338 4 Total $ 11,048 $ 203 $ 8,310 $ 139 Interest income recognized on a cash basis on impaired loans for the three months ended March 31, 2018 and 2017 , was $166,000 and $88,000 , respectively. The following table presents the recorded investment in nonaccrual loans by class of loan at the dates indicated: March 31, 2018 December 31, 2017 (In thousands) One-to-four family $ 820 $ 681 Commercial real estate 260 378 Construction and land 50 52 Home equity 359 365 Other consumer 101 59 Commercial business 583 — Total nonaccrual loans $ 2,173 $ 1,535 Past due loans. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. There were no loans past due 90 days or more and still accruing interest at March 31, 2018 and December 31, 2017 . The following table presents past due loans, net of partial loan charge-offs, by class, as of March 31, 2018 : 30-59 Past Due 60-89 Past Due 90 Days Past Due Total Past Due Current Total Loans (In thousands) Real Estate: One-to-four family $ 1,656 $ — $ 201 $ 1,857 $ 345,596 $ 347,453 Multi-family — — — — 68,095 68,095 Commercial real estate — — — — 220,542 220,542 Construction and land 38 — — 38 75,646 75,684 Total real estate loans 1,694 — 201 1,895 709,879 711,774 Consumer: Home equity 453 5 — 458 38,080 38,538 Other consumer 145 46 27 218 39,260 39,478 Total consumer loans 598 51 27 676 77,340 78,016 Commercial business loans — — 583 583 15,580 16,163 Total loans $ 2,292 $ 51 $ 811 $ 3,154 $ 802,799 $ 805,953 The following table presents past due loans, net of partial loan charge-offs, by class, as of December 31, 2017 : 30-59 Past Due 60-89 Past Due 90 Days Past Due Total Past Due Current Total Loans (In thousands) Real Estate: One-to-four family $ 213 $ — $ 231 $ 444 $ 354,947 $ 355,391 Multi-family — — — — 73,767 73,767 Commercial real estate 91 — — 91 202,865 202,956 Construction and land 1,187 — 19 1,206 69,939 71,145 Total real estate loans 1,491 — 250 1,741 701,518 703,259 Consumer: Home equity 383 78 — 461 38,012 38,473 Other consumer 77 30 — 107 27,999 28,106 Total consumer loans 460 108 — 568 66,011 66,579 Commercial business loans 648 — — 648 15,655 16,303 Total loans $ 2,599 $ 108 $ 250 $ 2,957 $ 783,184 $ 786,141 Credit quality indicator. Federal regulations provide for the classification of lower quality loans and other assets, such as debt and equity securities, as substandard, doubtful, or loss; risk ratings 6, 7, and 8 in our 8-point risk rating system, respectively. An asset is considered substandard if it is inadequately protected by the current net worth and pay capacity of the borrower or of any collateral pledged. Substandard assets include those characterized by the distinct possibility that First Federal will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full highly questionable and improbable, on the basis of currently existing facts, conditions, and values. Assets classified as loss are those considered uncollectible and of such little value that their continuance as assets without the establishment of a specific loss reserve is not warranted. When First Federal classifies problem assets as either substandard or doubtful, it may establish a specific allowance to address the risk specifically or allow the loss to be addressed in the general allowance. General allowances represent loss allowances that have been established to recognize the inherent risk associated with lending activities but that, unlike specific allowances, have not been specifically allocated to particular problem assets. When an insured institution classifies problem assets as a loss, it is required to charge off such assets in the period in which they are deemed uncollectible. Assets that do not currently expose First Federal to sufficient risk to warrant classification as substandard or doubtful but do possess identified weaknesses are designated as either watch or special mention assets; risk ratings 4 and 5 in our risk rating system, respectively. Loans not otherwise classified are considered pass graded loans and are rated 1-3 in our risk rating system. Additionally, First Federal categorizes loans as performing or nonperforming based on payment activity. Loans that are more than 90 days past due and nonaccrual loans are considered nonperforming. The following table represents the internally assigned grade as of March 31, 2018 , by class of loans: Pass Watch Special Mention Sub- Standard Loss Total (In thousands) Real Estate: One-to-four family $ 340,762 $ 4,830 $ 660 $ 1,201 $ — $ 347,453 Multi-family 67,981 — 114 — — 68,095 Commercial real estate 206,082 10,015 755 3,690 — 220,542 Construction and land 65,577 6,314 — 3,793 — 75,684 Total real estate loans 680,402 21,159 1,529 8,684 — 711,774 Consumer: Home equity 37,492 417 99 530 — 38,538 Other consumer 39,031 165 81 190 11 39,478 Total consumer loans 76,523 582 180 720 11 78,016 Commercial business loans 14,346 953 281 583 — 16,163 Total loans $ 771,271 $ 22,694 $ 1,990 $ 9,987 $ 11 $ 805,953 The following table represents the internally assigned grade as of December 31, 2017 , by class of loans: Pass Watch Special Mention Sub- Standard Total (In thousands) Real Estate: One-to-four family $ 348,273 $ 4,134 $ 1,580 $ 1,404 $ 355,391 Multi-family 71,535 2,117 115 — 73,767 Commercial real estate 188,251 9,893 964 3,848 202,956 Construction and land 59,360 8,040 3,662 83 71,145 Total real estate loans 667,419 24,184 6,321 5,335 703,259 Consumer: Home equity 37,502 323 93 555 38,473 Other consumer 27,646 202 146 112 28,106 Total consumer loans 65,148 525 239 667 66,579 Commercial business loans 14,230 653 772 648 16,303 Total loans $ 746,797 $ 25,362 $ 7,332 $ 6,650 $ 786,141 The following table represents the credit risk profile based on payment activity as of March 31, 2018 , by class of loans: Nonperforming Performing Total (In thousands) Real Estate: One-to-four family $ 820 $ 346,633 $ 347,453 Multi-family — 68,095 68,095 Commercial real estate 260 220,282 220,542 Construction and land 50 75,634 75,684 Consumer: Home equity 359 38,179 38,538 Other consumer 101 39,377 39,478 Commercial business 583 15,580 16,163 Total loans $ 2,173 $ 803,780 $ 805,953 The following table represents the credit risk profile based on payment activity as of December 31, 2017 , by class of loans: Nonperforming Performing Total (In thousands) Real Estate: One-to-four family $ 681 $ 354,710 $ 355,391 Multi-family — 73,767 73,767 Commercial real estate 378 202,578 202,956 Construction and land 52 71,093 71,145 Consumer: Home equity 365 38,108 38,473 Other consumer 59 28,047 28,106 Commercial business — 16,303 16,303 Total loans $ 1,535 $ 784,606 $ 786,141 Troubled debt restructuring. A TDR is a loan to a borrower who is experiencing financial difficulty that has been modified from its original terms and conditions in such a way that First Federal is granting the borrower a concession of some kind. First Federal has granted a variety of concessions to borrowers in the form of loan modifications. The modifications are generally related to the loan's interest rate, term and payment amount or a combination thereof. Upon identifying a receivable as a TDR loan, First Federal classifies the loan as impaired for purposes of determining the allowance for loan losses. This requires the loan to initially be evaluated individually for impairment, generally based on the expected cash flows under the new terms discounted at the loan’s original effective interest rates. For TDR loans that subsequently default, the method of determining impairment is generally the fair value of the collateral less estimated selling costs. TDR loans may be upgraded in their classification and placed on accrual status once there is a sustained period of repayment performance, usually six months or longer, and there is a reasonable assurance that repayment will continue. First Federal allows reclassification of a troubled debt restructuring back into the general loan pool (as a non-troubled debt restructuring) if the borrower is able to refinance the loan at then-current market rates and meet all of the underwriting criteria of First Federal required of other borrowers. The refinance must be based on the borrower’s ability to repay the debt and no special concessions of rate and/or term are granted to the borrower. The following table is a summary of information pertaining to TDR loans included in impaired loans at the dates indicated: March 31, December 31, 2018 2017 (In thousands) Total TDR loans $ 4,543 $ 4,919 Allowance for loan losses related to TDR loans 159 182 Total nonaccrual TDR loans 372 393 The following table presents newly restructured and renewals or modifications of existing TDR loans by class that occurred during the three months ended March 31, 2018 , by type of concession granted. Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) Pre-modification outstanding recorded investment One- to four-family 2 $ — $ — $ 180 $ 180 2 $ — $ — $ 180 $ 180 Post-modification outstanding recorded investment One- to four-family 2 $ — $ — $ 179 $ 179 2 $ — $ — $ 179 $ 179 There were no TDR loans which incurred a payment default within 12 months of the restructure date during the three months ended March 31, 2018 . The following table presents newly restructured and renewals or modifications of existing TDR loans by class that occurred during the three months ended March 31, 2017 , by type of concession granted. Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) Pre-modification outstanding recorded investment One- to four-family 2 $ 95 $ 89 $ — $ 184 Commercial real estate 1 — — 134 134 3 $ 95 $ 89 $ 134 $ 318 Post-modification outstanding recorded investment One- to four-family 2 $ 94 $ 88 $ — $ 182 Commercial real estate 1 — — 134 134 3 $ 94 $ 88 $ 134 $ 316 The following is a summary of TDR loans which incurred a payment default within 12 months of the restructure date during the three months ended March 31, 2017 . Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) TDR loans that subsequently defaulted One- to four-family 1 $ — $ — $ 50 $ 50 No additional funds were committed to be advanced in connection with impaired loans at March 31, 2018 . The following table presents TDR loans by class at the dates indicated by accrual and nonaccrual status. March 31, 2018 December 31, 2017 Accrual Nonaccrual Total Accrual Nonaccrual Total (In thousands) One-to-four family $ 2,824 $ 265 $ 3,089 $ 3,165 $ 176 $ 3,341 Multi-family 114 — 114 115 — 115 Commercial real estate 685 107 792 693 217 910 Home equity 267 — 267 270 — 270 Commercial business 281 — 281 283 — 283 Total TDR loans $ 4,171 $ 372 $ 4,543 $ 4,526 $ 393 $ 4,919

Deposits

Deposits	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
Deposits	Deposits The aggregate amount of time deposits in excess of the Federal Deposit Insurance Corporation ("FDIC") insured limit, currently $250,000 , at March 31, 2018 and December 31, 2017 , was $82.6 million and $82.3 million , respectively. Deposits and weighted-average interest rates at the dates indicated are as follows: Weighted-Average Interest Rate March 31, 2018 Weighted-Average Interest Rate December 31, 2017 (Dollars in thousands) Savings 0.10% $ 107,758 0.05% $ 103,243 Transaction accounts 0.01% 261,001 0.01% 272,484 Money market accounts 0.32% 271,729 0.33% 270,052 Certificates of deposit and jumbo certificates 1.30% 240,134 1.27% 239,253 $ 880,622 $ 885,032 Weighted-average interest rate 0.47 % 0.45 % Maturities of certificates at the dates indicated are as follows: March 31, 2018 December 31, 2017 (In thousands) Within one year or less $ 154,303 $ 139,613 After one year through two years 50,800 61,906 After two years through three years 19,997 20,732 After three years through four years 9,820 10,089 After four years through five years 5,187 6,886 After five years 27 27 $ 240,134 $ 239,253 Deposits at March 31, 2018 and December 31, 2017 , included $53.2 million and $56.2 million , respectively, in public fund deposits. Investment securities with a carrying value of $38.7 million and $41.0 million were pledged as collateral for these deposits at March 31, 2018 and December 31, 2017 , respectively. This exceeds the minimum collateral requirements established by the Washington Public Deposit Protection Commission. Interest on deposits by type for the periods shown was as follows: Three Months Ended March 31, 2018 2017 (In thousands) Savings $ 16 $ 9 Transaction accounts 4 4 Insured money market accounts 215 212 Certificates of deposit and jumbo certificates 750 493 $ 985 $ 718

Federal Taxes on Income

Federal Taxes on Income	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Federal Taxes on Income	Federal Taxes on Income Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. These calculations are based on many complex factors including estimates of the timing of reversals of temporary differences, the interpretation of federal income tax laws, and a determination of the differences between the tax and the financial reporting basis of assets and liabilities. Actual results could differ significantly from the estimates and interpretations used in determining the current and deferred income tax assets and liabilities. Under current Federal income tax regulations, charitable contribution deductions are limited to 10% of taxable income. Due to this limitation, the Company currently has a valuation allowance of $1.2 million for financial statement reporting purposes related to its contribution to the Foundation. The contribution carryforward and related valuation allowance will expire in 2020. A valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company evaluates whether its deferred tax assets will be realized and adjusts the amount of its valuation allowance, if necessary. Effective January 1, 2018, the corporate U.S. statutory federal income tax rate was reduced from 35% to 21% under the Tax Cuts and Jobs Act. The Company completed its accounting under ASC 740 in December 2017 for all material deferred tax assets and liabilities with provisional amounts recorded for immaterial items. No adjustments were made to provisional amounts during the three months ended March 31, 2018 and none are anticipated during the one year SEC Staff Accounting Bulletin 118 measurement period. The effective tax rates were 18.5% and 16.5% for the three months ended March 31, 2018 and 2017 , respectively. The effective tax rates differ from the statutory maximum federal tax rate for 2018 and 2017 of 21% and 35%, respectively, largely due to the nontaxable earnings on bank owned life insurance and tax-exempt interest income earned on certain investment securities and loans.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings per share is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. In addition, nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities and are included in the computation of earnings per share. The following table presents a reconciliation of the components used to compute basic and diluted earnings per share for the three months ended March 31, 2018 and 2017 . Three Months Ended March 31, 2018 2017 (In thousands, except share data) Numerator: Net income $ 1,523 $ 2,164 Denominator: Basic weighted average common shares outstanding 10,491,647 10,812,035 Dilutive restricted stock grants 113,009 107,706 Diluted weighted average common shares outstanding 10,604,656 10,919,741 Basic earnings per share $ 0.15 $ 0.20 Diluted earnings per share $ 0.14 $ 0.20 Unallocated ESOP shares are not included as outstanding for either basic or diluted earnings per share calculations. As of March 31, 2018 and 2017 , there were 886,671 and 938,037 shares in the ESOP that remain unallocated, respectively. Potential dilutive shares are excluded from the computation of EPS if their effect is anti-dilutive. There were no anti-dilutive shares at March 31, 2018 or 2017 .

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Benefits	Employee Benefits Employee Stock Ownership Plan In connection with the Conversion, the Company established an ESOP for eligible employees of the Company and the Bank. Employees of the Company and the Bank who have been credited with at least 1,000 hours of service during a 12 -month period are eligible to participate in the ESOP. Pursuant to the Plan, the ESOP purchased shares in the open market with funds borrowed from First Northwest. The Bank will make contributions to the ESOP in amounts necessary to amortize the ESOP loan payable to First Northwest over a period of 20 years, bearing estimated interest at 2.46% . The loan is secured by shares purchased with the loan proceeds and will be repaid by the ESOP with funds from the Bank's discretionary contributions to the ESOP and earnings on the ESOP assets. No payment was made during the three months ended March 31, 2018 . As shares are committed to be released from collateral, the Company reports compensation expense equal to the average daily market prices of the shares and the shares become outstanding for EPS computations. The compensation expense is accrued monthly throughout the year. Dividends on allocated ESOP shares are recorded as a reduction of retained earnings; dividends on unallocated ESOP shares are recorded as a reduction of debt and accrued interest. Compensation expense related to the ESOP for the three months ended March 31, 2018 and 2017 , was $220,000 and $203,000 , respectively. Shares issued to the ESOP as of the dates indicated are as follows: March 31, 2018 December 31, 2017 (Dollars in thousands) Allocated shares 121,695 121,695 Committed to be released shares 39,663 26,442 Unallocated shares 886,671 899,892 Total ESOP shares issued 1,048,029 1,048,029 Fair value of unallocated shares $ 14,976 $ 14,668 Stock-based Compensation On November 16, 2015 , the Company's shareholders approved the First Northwest Bancorp 2015 Equity Incentive Plan (the "2015 EIP"), which provides for the grant of incentive stock options, non-qualified stock options, restricted stock and restricted stock units to eligible participants. The cost of awards under the 2015 EIP generally is based on the fair value of the awards on their grant date. The maximum number of shares that may be utilized for awards under the 2015 EIP is 1,834,050 . The 2015 EIP provides for the use of authorized but unissued shares or shares that have been reacquired by First Northwest to fund share-based awards. At March 31, 2018 , there were 1,408,450 total shares available for grant under the 2015 EIP, including 98,414 shares available to be granted as restricted stock. During the three months ended March 31, 2018 and 2017 , no shares of restricted stock were awarded and no stock options were granted. Awarded shares of restricted stock vest over five years from the date of grant as long as the eligible participant remains in service to the Company. The Company recognizes compensation expense for the restricted stock awards based on the fair value of the shares at the award date. For the three months ended March 31, 2018 and 2017 , total compensation expense for the 2015 EIP was $273,000 and $217,000 , respectively. Included in the above compensation expense for the three months ended March 31, 2018 and 2017 , was directors' compensation of $85,000 and $95,000 , respectively. The following tables provide a summary of changes in non-vested restricted stock awards for the periods shown: For the Three Months Ended March 31, 2018 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2018 347,600 $ 13.18 Granted — — Vested — — Canceled (1) — — Non-vested at March 31, 2018 347,600 13.18 (1) A surrender of vested stock awards by a participant surrendering the number of shares valued at the current stock price at the vesting date to cover the total cost of the vested shares. The surrendered shares are canceled and are unavailable for reissue. For the Three Months Ended March 31, 2017 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2017 390,000 $ 12.70 Granted — — Vested — — Forfeited — — Non-vested at March 31, 2017 390,000 12.70 As of March 31, 2018 , there was $3.8 million of total unrecognized compensation cost related to non-vested shares granted as restricted stock awards. The cost is expected to be recognized over the remaining weighted-average vesting period of approximately 3.45 years.

Stock-based Compensation

Stock-based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Employee Benefits Employee Stock Ownership Plan In connection with the Conversion, the Company established an ESOP for eligible employees of the Company and the Bank. Employees of the Company and the Bank who have been credited with at least 1,000 hours of service during a 12 -month period are eligible to participate in the ESOP. Pursuant to the Plan, the ESOP purchased shares in the open market with funds borrowed from First Northwest. The Bank will make contributions to the ESOP in amounts necessary to amortize the ESOP loan payable to First Northwest over a period of 20 years, bearing estimated interest at 2.46% . The loan is secured by shares purchased with the loan proceeds and will be repaid by the ESOP with funds from the Bank's discretionary contributions to the ESOP and earnings on the ESOP assets. No payment was made during the three months ended March 31, 2018 . As shares are committed to be released from collateral, the Company reports compensation expense equal to the average daily market prices of the shares and the shares become outstanding for EPS computations. The compensation expense is accrued monthly throughout the year. Dividends on allocated ESOP shares are recorded as a reduction of retained earnings; dividends on unallocated ESOP shares are recorded as a reduction of debt and accrued interest. Compensation expense related to the ESOP for the three months ended March 31, 2018 and 2017 , was $220,000 and $203,000 , respectively. Shares issued to the ESOP as of the dates indicated are as follows: March 31, 2018 December 31, 2017 (Dollars in thousands) Allocated shares 121,695 121,695 Committed to be released shares 39,663 26,442 Unallocated shares 886,671 899,892 Total ESOP shares issued 1,048,029 1,048,029 Fair value of unallocated shares $ 14,976 $ 14,668 Stock-based Compensation On November 16, 2015 , the Company's shareholders approved the First Northwest Bancorp 2015 Equity Incentive Plan (the "2015 EIP"), which provides for the grant of incentive stock options, non-qualified stock options, restricted stock and restricted stock units to eligible participants. The cost of awards under the 2015 EIP generally is based on the fair value of the awards on their grant date. The maximum number of shares that may be utilized for awards under the 2015 EIP is 1,834,050 . The 2015 EIP provides for the use of authorized but unissued shares or shares that have been reacquired by First Northwest to fund share-based awards. At March 31, 2018 , there were 1,408,450 total shares available for grant under the 2015 EIP, including 98,414 shares available to be granted as restricted stock. During the three months ended March 31, 2018 and 2017 , no shares of restricted stock were awarded and no stock options were granted. Awarded shares of restricted stock vest over five years from the date of grant as long as the eligible participant remains in service to the Company. The Company recognizes compensation expense for the restricted stock awards based on the fair value of the shares at the award date. For the three months ended March 31, 2018 and 2017 , total compensation expense for the 2015 EIP was $273,000 and $217,000 , respectively. Included in the above compensation expense for the three months ended March 31, 2018 and 2017 , was directors' compensation of $85,000 and $95,000 , respectively. The following tables provide a summary of changes in non-vested restricted stock awards for the periods shown: For the Three Months Ended March 31, 2018 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2018 347,600 $ 13.18 Granted — — Vested — — Canceled (1) — — Non-vested at March 31, 2018 347,600 13.18 (1) A surrender of vested stock awards by a participant surrendering the number of shares valued at the current stock price at the vesting date to cover the total cost of the vested shares. The surrendered shares are canceled and are unavailable for reissue. For the Three Months Ended March 31, 2017 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2017 390,000 $ 12.70 Granted — — Vested — — Forfeited — — Non-vested at March 31, 2017 390,000 12.70 As of March 31, 2018 , there was $3.8 million of total unrecognized compensation cost related to non-vested shares granted as restricted stock awards. The cost is expected to be recognized over the remaining weighted-average vesting period of approximately 3.45 years.

Fair Value Accounting and Measu

Fair Value Accounting and Measurement	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Accounting and Measurement	Fair Value Accounting and Measurement Fair value is the price to sell an asset or transfer a liability in an orderly transaction between market participants in the Company’s principal market. The Company has established and documented its process for determining the fair values of its assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, management determines the fair value of the Company’s assets and liabilities using valuation models or third-party pricing services, both of which rely on market-based parameters when available, such as interest rate yield curves, option volatilities and credit spreads, or unobservable inputs. Unobservable inputs may be based on management’s judgment, assumptions, and estimates related to credit quality, liquidity, interest rates, and other relevant inputs. Any changes to valuation methodologies are reviewed by management to ensure they are relevant and justified. Valuation methodologies are refined as more market-based data becomes available. A three-level valuation hierarchy is used in determining fair value that is based on the transparency of the inputs used in the valuation process. The inputs used in determining fair value in each of the three levels of the hierarchy are as follows: Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 - Either: (i) quoted prices for similar assets or liabilities; (ii) observable inputs, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. Level 3 - Unobservable inputs. The hierarchy gives the highest ranking to Level 1 inputs and the lowest ranking to Level 3 inputs. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the overall fair value measurement. Qualitative disclosures of valuation techniques - Securities available for sale: where quoted prices are available in an active market, securities are classified as Level 1. Level 1 instruments include highly liquid government bonds, securities issued by the U.S. Treasury, and exchange-traded equity securities. If quoted prices are not available, management determines fair value using pricing models, quoted prices of similar securities, which are considered Level 2, or discounted cash flows. In certain cases, where there is limited activity in the market for a particular instrument, assumptions must be made to determine their fair value. Such instruments are classified as Level 3. Assets and liabilities measured at fair value on a recurring basis - Assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly (i.e., daily, weekly, monthly, or quarterly). The following tables show the Company’s assets measured at fair value on a recurring basis at the dates indicated: March 31, 2018 Quoted Prices in or Liabilities Significant Inputs Significant Inputs (Level 1) (Level 2) (Level 3) Total (In thousands) Securities available-for-sale Municipal bonds $ — $ 10,624 $ — $ 10,624 ABS agency — 16,089 — 16,089 ABS corporate — 22,692 — 22,692 Corporate debt — 10,040 — 10,040 SBA — 40,349 — 40,349 MBS agency — 140,172 — 140,172 MBS corporate — 18,252 — 18,252 $ — $ 258,218 $ — $ 258,218 December 31, 2017 Quoted Prices in Significant Significant (Level 1) (Level 2) (Level 3) Total (In thousands) Securities available-for-sale Municipal bonds $ — $ 13,434 $ — $ 13,434 ABS agency — 21,770 — 21,770 ABS corporate — 22,768 — 22,768 Corporate debt — 19,908 — 19,908 SBA — 47,274 — 47,274 MBS agency — 144,542 — 144,542 MBS corporate — 20,546 — 20,546 $ — $ 290,242 $ — $ 290,242 Assets and liabilities measured at fair value on a nonrecurring basis - Assets are considered to be fair valued on a nonrecurring basis if the fair value measurement of the instrument does not necessarily result in a change in the amount recorded on the consolidated balance sheets. Generally, nonrecurring valuation is the result of the application of other accounting pronouncements that require assets or liabilities to be assessed for impairment or recorded at the lower of cost or fair value. The following tables present the Company’s assets measured at fair value on a nonrecurring basis at the dates indicated: March 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Impaired loans $ — $ — $ 13,345 $ 13,345 December 31, 2017 Level 1 Level 2 Level 3 Total (In thousands) Impaired loans $ — $ — $ 6,061 $ 6,061 At March 31, 2018 and December 31, 2017 , there were no impaired loans with discounts to appraisal disposition value or other unobservable inputs. The following tables present the carrying value and estimated fair value of financial instruments at the dates indicated: March 31, 2018 Carrying Amount Estimated Fair Value Fair Value Measurements Using: Level 1 Level 2 Level 3 (In thousands) Financial assets Cash and cash equivalents $ 25,150 $ 25,150 $ 25,150 $ — $ — Investment securities available for sale 258,218 258,218 — 258,218 — Investment securities held to maturity 47,709 47,267 — 47,267 — Loans receivable, net 798,828 776,640 — — 776,640 FHLB stock 6,389 6,389 — 6,389 — Accrued interest receivable 3,641 3,641 — 3,641 — Mortgage servicing rights, net 1,104 1,821 — — 1,821 Financial liabilities Demand deposits $ 640,488 $ 640,488 $ 640,488 $ — $ — Time deposits 240,134 237,823 — 237,823 — Borrowings 122,949 124,029 — 124,029 — Accrued interest payable 210 210 — 210 — — December 31, 2017 Carrying Amount Estimated Fair Value Fair Value Measurements Using: Level 1 Level 2 Level 3 (In thousands) Financial assets Cash and cash equivalents $ 36,801 $ 36,801 $ 36,801 $ — $ — Investment securities available for sale 290,242 290,242 — 290,242 — Investment securities held to maturity 50,126 50,266 — 50,266 — Loans held for sale 788 788 — 788 — Loans receivable, net 779,111 768,181 — — 768,181 FHLB stock 7,023 7,023 — 7,023 — Accrued interest receivable 3,745 3,745 — 3,745 — Mortgage servicing rights, net 1,095 1,669 — — 1,669 Financial liabilities Demand deposits $ 645,779 $ 645,779 $ 645,779 $ — $ — Time deposits 239,253 237,841 — 237,841 — Borrowings 144,100 145,892 — 145,892 — Accrued interest payable 325 325 — 325 — Financial assets and liabilities other than investment securities are not traded in active markets. Estimated fair values require subjective judgments and are approximate. The estimates of fair value in the previous table are not necessarily representative of amounts that could be realized in actual market transactions, or of the underlying value of the Company. The methods and assumptions used by the Company in estimating fair values of financial instruments as set forth below in accordance with ASC Topic 825, Financial Instruments , as amended by ASU 2016-01 requiring public entities to use the exit price notion effective January 1, 2018, are as follows: Financial instruments with a carrying amount equal to fair value - The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value equal to the carrying amount. These instruments include cash and due from banks, interest bearing deposits with banks, FHLB stock, accrued interest receivable, and accrued interest payable. FHLB stock is not publicly traded, however, it may be redeemed on a dollar-for-dollar basis, for any amount the Bank is not required to hold, subject to the FHLB's discretion. The fair value is therefore equal to the carrying amount. Securities - Fair values for investment securities are primarily measured using information from a third-party pricing service. The pricing service uses pricing models based on market data. In the event that limited or less transparent information is provided by the third-party pricing service, fair value is estimated using secondary pricing services or non-binding third-party broker quotes. Loans held for sale - The fair value of loans held for sale is based on quoted market prices from Federal Home Loan Mortgage Corporation ("Freddie Mac"), which are updated daily and represent prices at which loans are exchanged in high volumes and in a liquid market. Loans receivable, net - At March 31, 2018 , the fair value of loans and leases is estimated by discounting the future cash flows using the current rate at which similar loans and leases would be made to borrowers with similar credit and for the same remaining maturities. Additionally, to be consistent with the requirements under FASB ASC Topic 820 for Fair Value Measurements and Disclosures, the loans and leases were valued at a price that represents the Company’s exit price or the price at which these instruments would be sold or transferred. At December 31, 2017, fair values were estimated for portfolios of loans with similar financial characteristics. Loans were segregated by type, including fixed and variable one- to four-family residential real estate, commercial, and consumer loans. There is an accurate and reliable secondary market for one- to four-family residential mortgage production, and available market benchmarks are used to establish discount factors for estimating fair value for these types of loans. Commercial and consumer loans use market benchmarks when available; however, due to the varied term structures and credit issues involved, they mainly rely on cash flow projections and repricing characteristics within the loan portfolio. These amounts are discounted further by embedded probable losses expected to be realized in the portfolio. Mortgage servicing rights, net - The estimated fair value of mortgage servicing rights is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Deposits - The fair value of deposits with no stated maturity, such as non-interest bearing deposits, savings and interest checking accounts, and money market accounts, is equal to the amount payable on demand as of March 31, 2018 and December 31, 2017 . The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. Borrowings - The fair value of FHLB advances and other borrowings are calculated using a discounted cash flow method, adjusted for market interest rates and terms to maturity. Off-balance-sheet financial instruments - Commitments to extend credit represent all off-balance-sheet financial instruments. The fair value of these commitments is not significant.

Non-interest Income

Non-interest Income	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Non-interest Income	Non-interest Income During the three months ended March 31, 2018, the Company adopted the amendments of ASU 2014-09 Revenue from Contracts with Customers (Topic 606) and all subsequent ASUs that modified Topic 606. The Company has included the following table regarding the Company’s non-interest income for the periods presented. Three Months Ended March 31, 2018 2017 (In thousands) Non-interest income: Loan fees (1) $ 125 $ 96 Deposit fees 392 400 Debit interchange income 32 37 Credit card interchange income 406 357 Investment securities gain (loss), net (1) 122 — Gain on loan sales, net (1) 167 284 Increase in cash surrender value of bank-owned life ins (1) 149 178 Income from bank-owned life insurance payout (1) — 768 Other income: Investment services revenue 74 87 Gain or loss on subsidiary (1) 14 — Remaining other income 1 (6 ) Total other income 89 81 Total non-interest income $ 1,482 $ 2,201 (1) Not within scope of ASC 606 The Company recognizes revenue as it is earned and noted no impact to its revenue recognition policies as a result of the adoption of ASU 2014-09. The following is a discussion of key revenues within the scope of the new revenue guidance. Deposit fees - The Company earns fees from its deposit customers for account maintenance, transaction-based activity and overdraft services. Account maintenance fees consist primarily of account fees and analyzed account fees charged on deposit accounts on a monthly basis. The performance obligation is satisfied and the fees are recognized on a monthly basis as the service period is completed. Transaction-based fees on deposit accounts are charged to deposit customers for specific services provided to the customer, such as non-sufficient funds fees, overdraft fees, and wire fees. The performance obligation is completed as the transaction occurs and the fees are recognized at the time each specific service is provided to the customer. Debit interchange income - Debit and Automated Teller Machine ("ATM") interchange income represent fees earned when a debit card issued by the Company is used. The Company earns interchange fees from debit cardholder transactions through card networks. In addition, the Company earns interchange fees for use of its ATM by customers of other banking institutions. Interchange fees are based on purchase volumes and other factors and are recognized as transactions occur. The performance obligation is satisfied and the fees are earned when the cost of the transaction is charged to the cardholder's debit card. Certain expenses directly associated with the credit and debit card are netted against interchange income. Credit card interchange income - Credit card interchange income represents fees earned when a credit card issued by the Bank through a third-party vendor is used. Similar to the debit card interchange, the Bank earns an interchange fee for each transaction made with a Bank-branded credit card. The performance obligation is satisfied and the fees are earned when the cost of the transaction is charged to the cardholder's credit card. Certain expenses directly related to the credit card interchange contract are netted against interchange income. Investment services revenue - Commissions received on the sale of investment related products is determined by a percentage of underlying instruments sold and is recognized when the sale is finalized. Gains/losses on the sale of other real estate owned are included in non-interest expense and are generally recognized when the performance obligation is complete. This is typically at delivery of control over the property to the buyer at time of each real estate closing.

Basis of Presentation and Cri19

Basis of Presentation and Critical Accounting Policies - (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	Basis of presentation - The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Accordingly, they do not include all of the information and footnotes required by U.S. Generally Accepted Accounting Principles ("GAAP") for complete financial statements. These unaudited interim consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes included in the Company's Annual Report on Form 10-KT for the six months ended December 31, 2017 . In our opinion, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation of the consolidated financial statements in accordance with GAAP have been included. The Company changed its fiscal year from June 30 to December 31 effective December 31, 2017. Operating results for the three months ended March 31, 2018 , are not necessarily indicative of the results that may be expected for future periods. In preparing the unaudited interim consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to a determination of the allowance for loan losses ("ALLL"), mortgage servicing rights, fair value of financial instruments, deferred tax assets and liabilities, and the valuation of impaired loans.
Principles of consolidation	Principles of consolidation - The accompanying consolidated financial statements include the accounts of First Northwest Bancorp and its wholly owned subsidiary, First Federal. All material intercompany accounts and transactions have been eliminated in consolidation.
Subsequent Events	Subsequent Events - The Company has evaluated subsequent events for potential recognition and disclosure and determined there are no such events or transactions requiring recognition or disclosure.
Recently adopted and issued accounting pronouncements	Recently adopted accounting pronouncements - In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) . In August 2015, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , which postponed the effective date of 2014-09. Subsequently, in March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations . This amendment clarifies that an entity should determine if it is the principal or the agent for each specified good or service promised in a contract with a customer. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing . The core principle of Topic 606 is that an entity must recognize revenue when it has satisfied a performance obligation of transferring promised goods or services to a customer. In general, the new guidance requires companies to use more judgment and make more estimates than under current guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. These standards were effective for interim and annual periods beginning after December 15, 2017. The Company has analyzed its revenue sources of noninterest income to determine when the satisfaction of the performance obligation occurs and the appropriate recognition of revenue. The adoption of these ASUs did not have a material impact on the Company’s consolidated financial statements as the Company did not identify any significant changes in the timing of revenue recognition when considering the amended accounting guidance since it is consistent with the Company’s current accounting policy for contracts. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. In addition, the amendments in this ASU require an entity to disclose the fair value of financial instruments using the exit price notion. Exit price is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The amendments in this ASU were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company has used the exit price notion in the fair value disclosure of financial instruments in Note 9 of this report. The adoption of ASU 2016-01 did not have a material impact on the Company’s consolidated financial statements or disclosures in the Notes to the Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The ASU provides specific guidance on eight classification issues in order to achieve more consistent reporting. The amendments in this ASU were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not currently have items on its cash flow statement that were impacted by adoption of this ASU and therefore adoption of ASU 2016-15 did not have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . The ASU shortens the amortization period for certain callable debt securities held at a premium using the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted. The adoption of ASU 2017-08 did not have a material impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting . This ASU provides clarity on the guidance related to stock compensation when there have been changes to the terms or conditions of a share-based payment award to which an entity would be required to apply modification accounting under ASC 718. The ASU provides the three following criteria must be met in order to not account for the effect of the modification of terms or conditions: the fair value, the vesting conditions and the classification as an equity or liability instrument of the modified award is the same as the original award immediately before the original award is modified. The amendments in this ASU were effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The Company has not had any modifications on share-based payment awards and therefore the adoption of ASU 2017-09 did not have a material impact on the Company’s consolidated financial statements. In March 2018, FASB issued ASU No. 2018-05, Income Taxes (Topic 740) . This ASU was issued to provide guidance on the income tax accounting implications of the Tax Cuts and Jobs Act, and allows for entities to report provisional amounts for specific income tax effects of the Act for which the accounting under Topic 740 was not yet complete but a reasonable estimate could be determined. A measurement period of one-year is allowed to complete the accounting effects under Topic 740 and revise any previous estimates reported. Any provisional amounts or subsequent adjustments included in an entity’s financial statements during the measurement period should be included in income from continuing operations as an adjustment to tax expense in the reporting period the amounts are determined. The Company adopted this ASU with the provisional adjustments as reported in the Consolidated Financial Statements on Form 10-KT as of December 31, 2017. As of March 31, 2018, the Company did not incur any adjustments to the provisional recognition. Recently issued accounting pronouncements - In February 2016, the FASB issued ASU No. 2016-02, Leases . ASU 2016-02 is intended to increase transparency and comparability among organizations by requiring the recognition of lease assets and lease liabilities on the balance sheet and disclosure of key information about leasing arrangements. The principal change required by this ASU relates to lessee accounting, and is that for operating leases, a lessee is required to (1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, (2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis, and (3) classify all cash payments within operating activities in the statement of cash flows. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. ASU 2016-02 also changes disclosure requirements related to leasing activities, and requires certain qualitative disclosures along with specific quantitative disclosures. The amendments in ASU 2016-02 are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early application of the amendments in ASU 2016-02 is permitted. The Company is compiling an inventory of all leased assets to determine the impact of ASU 2016-02 on its financial condition and results of operations. Once adopted, we expect to report higher assets and liabilities on our Consolidated Balance Sheets as a result of including right-of-use assets and lease liabilities related to certain banking offices and certain equipment under noncancelable operating lease agreements, which currently are not reflected in our Consolidated Balance Sheets. We do not expect the guidance to have a material impact on the Consolidated Statements of Income or Consolidated Statements of Changes in Shareholders' Equity. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Loss , which updates the guidance on recognition and measurement of credit losses for financial assets. The new requirements, known as the current expected credit loss model (CECL) will require entities to adopt an impairment model based on expected losses rather than incurred losses. ASU No. 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Upon adoption, the Company will change processes and procedures to calculate the allowance for loan losses, including changes in assumptions and estimates to consider expected credit losses over the life of the loan versus the current accounting practice that utilizes the incurred loss model. In addition, the current accounting policy and procedures for other-than-temporary impairment on investment securities available for sale will be replaced with an allowance approach. At this time, we do not anticipate an increase to the ALLL as a result of the implementation of this ASU based on the preliminary review and testing of different models being evaluated. The Company has formed an internal project management team which will coordinate and monitor implementation progress, work with our third-party vendor, and implement changes to processes and procedures to ensure the Company is fully compliant with the amendments at the adoption date. In August 2017, FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815). This ASU was issued to provide investors better insight to an entity’s risk management hedging strategies by permitting companies to recognize the economic results of its hedging strategies in its financial statements. The amendments in this ASU permit hedge accounting for hedging relationships involving nonfinancial risk and interest rate risk by removing certain limitations in cash flow and fair value hedging relationships. In addition, the ASU requires an entity to present the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported. This ASU is effective for fiscal years beginning after December 15, 2018, and early adoption is permitted. Adoption of ASU 2017-12 is not expected to have a material impact on the Company’s consolidated financial statements.
Reclassifications	Reclassifications - Certain amounts in the unaudited interim consolidated financial statements for prior periods have been reclassified to conform to the current unaudited financial statement presentation with no effect on net income or shareholders' equity.
Earnings Per Share	Basic earnings per share is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. In addition, nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities and are included in the computation of earnings per share.
Fair Value Measurement, Policy	Fair value is the price to sell an asset or transfer a liability in an orderly transaction between market participants in the Company’s principal market. The Company has established and documented its process for determining the fair values of its assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, management determines the fair value of the Company’s assets and liabilities using valuation models or third-party pricing services, both of which rely on market-based parameters when available, such as interest rate yield curves, option volatilities and credit spreads, or unobservable inputs. Unobservable inputs may be based on management’s judgment, assumptions, and estimates related to credit quality, liquidity, interest rates, and other relevant inputs. Any changes to valuation methodologies are reviewed by management to ensure they are relevant and justified. Valuation methodologies are refined as more market-based data becomes available. A three-level valuation hierarchy is used in determining fair value that is based on the transparency of the inputs used in the valuation process. The inputs used in determining fair value in each of the three levels of the hierarchy are as follows: Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 - Either: (i) quoted prices for similar assets or liabilities; (ii) observable inputs, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. Level 3 - Unobservable inputs. The hierarchy gives the highest ranking to Level 1 inputs and the lowest ranking to Level 3 inputs. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the overall fair value measurement. Qualitative disclosures of valuation techniques - Securities available for sale: where quoted prices are available in an active market, securities are classified as Level 1. Level 1 instruments include highly liquid government bonds, securities issued by the U.S. Treasury, and exchange-traded equity securities. If quoted prices are not available, management determines fair value using pricing models, quoted prices of similar securities, which are considered Level 2, or discounted cash flows. In certain cases, where there is limited activity in the market for a particular instrument, assumptions must be made to determine their fair value. Such instruments are classified as Level 3. Assets and liabilities measured at fair value on a recurring basis - Assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly (i.e., daily, weekly, monthly, or quarterly).
Fair Value of Financial Instruments	Financial assets and liabilities other than investment securities are not traded in active markets. Estimated fair values require subjective judgments and are approximate. The estimates of fair value in the previous table are not necessarily representative of amounts that could be realized in actual market transactions, or of the underlying value of the Company. The methods and assumptions used by the Company in estimating fair values of financial instruments as set forth below in accordance with ASC Topic 825, Financial Instruments , as amended by ASU 2016-01 requiring public entities to use the exit price notion effective January 1, 2018, are as follows: Financial instruments with a carrying amount equal to fair value - The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value equal to the carrying amount. These instruments include cash and due from banks, interest bearing deposits with banks, FHLB stock, accrued interest receivable, and accrued interest payable. FHLB stock is not publicly traded, however, it may be redeemed on a dollar-for-dollar basis, for any amount the Bank is not required to hold, subject to the FHLB's discretion. The fair value is therefore equal to the carrying amount. Securities - Fair values for investment securities are primarily measured using information from a third-party pricing service. The pricing service uses pricing models based on market data. In the event that limited or less transparent information is provided by the third-party pricing service, fair value is estimated using secondary pricing services or non-binding third-party broker quotes. Loans held for sale - The fair value of loans held for sale is based on quoted market prices from Federal Home Loan Mortgage Corporation ("Freddie Mac"), which are updated daily and represent prices at which loans are exchanged in high volumes and in a liquid market. Loans receivable, net - At March 31, 2018 , the fair value of loans and leases is estimated by discounting the future cash flows using the current rate at which similar loans and leases would be made to borrowers with similar credit and for the same remaining maturities. Additionally, to be consistent with the requirements under FASB ASC Topic 820 for Fair Value Measurements and Disclosures, the loans and leases were valued at a price that represents the Company’s exit price or the price at which these instruments would be sold or transferred. At December 31, 2017, fair values were estimated for portfolios of loans with similar financial characteristics. Loans were segregated by type, including fixed and variable one- to four-family residential real estate, commercial, and consumer loans. There is an accurate and reliable secondary market for one- to four-family residential mortgage production, and available market benchmarks are used to establish discount factors for estimating fair value for these types of loans. Commercial and consumer loans use market benchmarks when available; however, due to the varied term structures and credit issues involved, they mainly rely on cash flow projections and repricing characteristics within the loan portfolio. These amounts are discounted further by embedded probable losses expected to be realized in the portfolio. Mortgage servicing rights, net - The estimated fair value of mortgage servicing rights is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Deposits - The fair value of deposits with no stated maturity, such as non-interest bearing deposits, savings and interest checking accounts, and money market accounts, is equal to the amount payable on demand as of March 31, 2018 and December 31, 2017 . The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. Borrowings - The fair value of FHLB advances and other borrowings are calculated using a discounted cash flow method, adjusted for market interest rates and terms to maturity. Off-balance-sheet financial instruments - Commitments to extend credit represent all off-balance-sheet financial instruments. The fair value of these commitments is not significant.

Securities - (Tables)

Securities - (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized costs and fair values of securities available-for-sale	The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale and held-to-maturity at March 31, 2018 , are summarized as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In thousands) Available for Sale Municipal bonds $ 10,523 $ 124 $ (23 ) $ 10,624 U.S. government agency issued asset-backed securities (ABS agency) 16,266 22 (199 ) 16,089 Corporate issued asset-backed securities (ABS corporate) 22,818 — (126 ) 22,692 Corporate issued debt securities (Corporate debt) 9,986 213 (159 ) 10,040 U.S. Small Business Administration securities (SBA) 40,521 53 (225 ) 40,349 Mortgage-backed securities: U.S. government agency issued mortgage-backed securities (MBS agency) 144,359 12 (4,199 ) 140,172 Corporate issued mortgage-backed securities (MBS corporate) 18,520 14 (282 ) 18,252 Total securities available for sale $ 262,993 $ 438 $ (5,213 ) $ 258,218 Held to Maturity Municipal bonds $ 12,121 $ 114 $ (6 ) $ 12,229 SBA 368 — (2 ) 366 Mortgage-backed securities: MBS agency 35,220 86 (634 ) 34,672 Total securities held to maturity $ 47,709 $ 200 $ (642 ) $ 47,267 The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale and held-to-maturity at December 31, 2017 , are summarized as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In thousands) Available for Sale Municipal bonds $ 13,058 $ 391 $ (15 ) $ 13,434 ABS agency 21,972 36 (238 ) 21,770 ABS corporate 22,823 — (55 ) 22,768 Corporate debt 19,835 195 (122 ) 19,908 SBA 47,325 98 (149 ) 47,274 Mortgage-backed securities: MBS agency 146,532 36 (2,026 ) 144,542 MBS corporate 20,721 18 (193 ) 20,546 Total securities available for sale $ 292,266 $ 774 $ (2,798 ) $ 290,242 Held to Maturity Municipal bonds $ 13,963 $ 156 $ — $ 14,119 SBA 399 — (4 ) 395 Mortgage-backed securities: MBS agency 35,764 338 (350 ) 35,752 Total securities held to maturity $ 50,126 $ 494 $ (354 ) $ 50,266
Schedule of available-for-sale securities in a continuous unrealized loss position	The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of March 31, 2018 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (16 ) $ 4,270 $ (7 ) $ 110 $ (23 ) $ 4,380 ABS agency (62 ) 8,856 (137 ) 2,617 (199 ) 11,473 ABS corporate (126 ) 22,692 — — (126 ) 22,692 Corporate debt (159 ) 4,827 — — (159 ) 4,827 SBA (59 ) 7,199 (166 ) 7,268 (225 ) 14,467 Mortgage-backed securities: MBS agency (613 ) 29,138 (3,586 ) 109,328 (4,199 ) 138,466 MBS corporate (88 ) 8,160 (194 ) 6,314 (282 ) 14,474 Total available for sale $ (1,123 ) $ 85,142 $ (4,090 ) $ 125,637 $ (5,213 ) $ 210,779 Held to Maturity Municipal bonds $ — $ 315 $ (6 ) $ 962 $ (6 ) $ 1,277 SBA (2 ) 366 — — (2 ) 366 Mortgage-backed securities: MBS agency (118 ) 13,665 (516 ) 18,163 (634 ) 31,828 Total held to maturity $ (120 ) $ 14,346 $ (522 ) $ 19,125 $ (642 ) $ 33,471 The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of December 31, 2017 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (11 ) $ 4,276 $ (4 ) $ 114 $ (15 ) $ 4,390 ABS agency — — (238 ) 7,294 (238 ) 7,294 ABS corporate (55 ) 22,768 — — (55 ) 22,768 Corporate debt (122 ) 4,864 — — (122 ) 4,864 SBA (45 ) 7,421 (104 ) 8,067 (149 ) 15,488 Mortgage-backed securities: MBS agency (394 ) 57,081 (1,632 ) 85,421 (2,026 ) 142,502 MBS corporate (22 ) 5,808 (171 ) 10,172 (193 ) 15,980 Total available for sale $ (649 ) $ 102,218 $ (2,149 ) $ 111,068 $ (2,798 ) $ 213,286 Held to Maturity SBA $ (4 ) $ 395 $ — $ — $ (4 ) $ 395 Mortgage-backed securities: MBS agency (6 ) 1,001 (344 ) 18,494 (350 ) 19,495 Total held to maturity $ (10 ) $ 1,396 $ (344 ) $ 18,494 $ (354 ) $ 19,890
Schedule of held-to-maturity securities in a continuous unrealized loss position	The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of March 31, 2018 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (16 ) $ 4,270 $ (7 ) $ 110 $ (23 ) $ 4,380 ABS agency (62 ) 8,856 (137 ) 2,617 (199 ) 11,473 ABS corporate (126 ) 22,692 — — (126 ) 22,692 Corporate debt (159 ) 4,827 — — (159 ) 4,827 SBA (59 ) 7,199 (166 ) 7,268 (225 ) 14,467 Mortgage-backed securities: MBS agency (613 ) 29,138 (3,586 ) 109,328 (4,199 ) 138,466 MBS corporate (88 ) 8,160 (194 ) 6,314 (282 ) 14,474 Total available for sale $ (1,123 ) $ 85,142 $ (4,090 ) $ 125,637 $ (5,213 ) $ 210,779 Held to Maturity Municipal bonds $ — $ 315 $ (6 ) $ 962 $ (6 ) $ 1,277 SBA (2 ) 366 — — (2 ) 366 Mortgage-backed securities: MBS agency (118 ) 13,665 (516 ) 18,163 (634 ) 31,828 Total held to maturity $ (120 ) $ 14,346 $ (522 ) $ 19,125 $ (642 ) $ 33,471 The following shows the unrealized gross losses and fair value of the investment portfolio by length of time that individual securities in each category have been in a continuous loss position as of December 31, 2017 : Less Than Twelve Months Twelve Months or Longer Total Gross Losses Fair Value Gross Losses Fair Value Gross Losses Fair Value (In thousands) Available for Sale Municipal bonds $ (11 ) $ 4,276 $ (4 ) $ 114 $ (15 ) $ 4,390 ABS agency — — (238 ) 7,294 (238 ) 7,294 ABS corporate (55 ) 22,768 — — (55 ) 22,768 Corporate debt (122 ) 4,864 — — (122 ) 4,864 SBA (45 ) 7,421 (104 ) 8,067 (149 ) 15,488 Mortgage-backed securities: MBS agency (394 ) 57,081 (1,632 ) 85,421 (2,026 ) 142,502 MBS corporate (22 ) 5,808 (171 ) 10,172 (193 ) 15,980 Total available for sale $ (649 ) $ 102,218 $ (2,149 ) $ 111,068 $ (2,798 ) $ 213,286 Held to Maturity SBA $ (4 ) $ 395 $ — $ — $ (4 ) $ 395 Mortgage-backed securities: MBS agency (6 ) 1,001 (344 ) 18,494 (350 ) 19,495 Total held to maturity $ (10 ) $ 1,396 $ (344 ) $ 18,494 $ (354 ) $ 19,890
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity	The amortized cost and estimated fair value of investment securities by contractual maturity are shown in the following tables at the dates indicated. Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; therefore, these securities are shown separately. March 31, 2018 Available-for-Sale Held-to-Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value (In thousands) Mortgage-backed securities: Due within one year $ — $ — $ — $ — Due after one through five years 7,323 7,102 1,688 1,686 Due after five through ten years 13,023 12,618 2,676 2,603 Due after ten years 142,533 138,704 30,856 30,383 Total mortgage-backed securities 162,879 158,424 35,220 34,672 All other investment securities: Due within one year — — — — Due after one through five years 4,286 4,270 742 751 Due after five through ten years 18,531 18,517 6,904 6,939 Due after ten years 77,297 77,007 4,843 4,905 Total all other investment securities 100,114 99,794 12,489 12,595 Total investment securities $ 262,993 $ 258,218 $ 47,709 $ 47,267 December 31, 2017 Available-for-Sale Held-to-Maturity Amortized Estimated Amortized Estimated (In thousands) Mortgage-backed securities: Due within one year $ — $ — $ — $ — Due after one through five years 7,363 7,260 1,957 1,973 Due after five through ten years 13,337 13,127 2,835 2,792 Due after ten years 146,553 144,701 30,972 30,987 Total mortgage-backed securities 167,253 165,088 35,764 35,752 All other investment securities: Due within one year — — — — Due after one through five years 4,388 4,380 — — Due after five through ten years 29,482 29,661 9,491 9,574 Due after ten years 91,143 91,113 4,871 4,940 Total all other investment securities 125,013 125,154 14,362 14,514 Total investment securities $ 292,266 $ 290,242 $ 50,126 $ 50,266
Summary of sales of available-for-sale securities	Sales of securities available-for-sale for the periods shown are summarized as follows: Three Months Ended March 31, 2018 2017 (In thousands) Proceeds from sales $ 32,859 $ — Gross realized gains 164 — Gross realized losses (42 ) —

Loans Receivable - (Tables)

Loans Receivable - (Tables)	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Schedule of loans receivable balances	Loans receivable consisted of the following at the dates indicated: March 31, 2018 December 31, 2017 (In thousands) Real Estate: One-to-four family $ 347,453 $ 355,391 Multi-family 68,095 73,767 Commercial real estate 220,542 202,956 Construction and land 75,684 71,145 Total real estate loans 711,774 703,259 Consumer: Home equity 38,538 38,473 Other consumer 39,478 28,106 Total consumer loans 78,016 66,579 Commercial business loans 16,163 16,303 Total loans 805,953 786,141 Less: Net deferred loan fees 501 724 Premium on purchased loans, net (2,360 ) (2,454 ) Allowance for loan losses 8,984 8,760 Total loans receivable, net $ 798,828 $ 779,111
Schedule of activity in allowance for loan losses	The following tables summarize changes in the ALLL and loan portfolio by segment and impairment method for the periods shown: At or For the Three Months Ended March 31, 2018 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) ALLL: Beginning balance $ 3,061 $ 648 $ 1,847 $ 648 $ 787 $ 712 $ 265 $ 792 $ 8,760 Provision for loan losses 105 (1 ) 206 31 (51 ) 331 444 (755 ) 310 Charge-offs — — — — — (123 ) — — (123 ) Recoveries 1 — — — 8 28 — — 37 Ending balance $ 3,167 $ 647 $ 2,053 $ 679 $ 744 $ 948 $ 709 $ 37 $ 8,984 At March 31, 2018 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) Total ALLL $ 3,167 $ 647 $ 2,053 $ 679 $ 744 $ 948 $ 709 $ 37 $ 8,984 General reserve 3,127 646 1,939 678 737 923 123 37 8,210 Specific reserve 40 1 114 1 7 25 586 — 774 Total loans $ 347,453 $ 68,095 $ 220,542 $ 75,684 $ 38,538 $ 39,478 $ 16,163 $ — $ 805,953 General reserves (1) 343,809 67,981 216,324 71,905 37,913 39,377 15,299 — 792,608 Specific reserves (2) 3,644 114 4,218 3,779 625 101 864 — 13,345 (1) Loans collectively evaluated for general reserves. (2) Loans individually evaluated for specific reserves. At or For the Three Months Ended March 31, 2017 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total ALLL: (In thousands) Beginning balance $ 2,892 $ 370 $ 1,488 $ 585 $ 794 $ 361 $ 652 $ 918 $ 8,060 Provision for loan losses 147 128 184 104 (58 ) 106 495 (891 ) 215 Charge-offs — — — — (79 ) (33 ) — — (112 ) Recoveries 25 — — — 125 14 1 — 165 Ending balance $ 3,064 $ 498 $ 1,672 $ 689 $ 782 $ 448 $ 1,148 $ 27 $ 8,328 At December 31, 2017 One-to- four family Multi-family Commercial real estate Construction and land Home equity Other consumer Commercial business Unallocated Total (In thousands) Total ALLL $ 3,061 $ 648 $ 1,847 $ 648 $ 787 $ 712 $ 265 $ 792 $ 8,760 General reserve 3,014 647 1,719 647 779 703 262 792 8,563 Specific reserve 47 1 128 1 8 9 3 — 197 Total loans $ 355,391 $ 73,767 $ 202,956 $ 71,145 $ 38,473 $ 28,106 $ 16,303 $ — $ 786,141 General reserves (1) 351,545 73,652 201,885 71,093 37,838 28,047 16,020 — 780,080 Specific reserves (2) 3,846 115 1,071 52 635 59 283 — 6,061 (1) Loans collectively evaluated for general reserves. (2) Loans individually evaluated for specific reserves.
Schedules of impaired loans	The following table presents a summary of loans individually evaluated for impairment by portfolio segment at the dates indicated: March 31, 2018 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance (In thousands) With no allowance recorded: One-to-four family $ 465 $ 523 $ — $ 382 $ 407 $ — Commercial real estate 3,426 3,479 — 256 378 — Construction and land 3,729 3,731 — — 3 — Home equity 358 507 — 365 515 — Other consumer — 177 — — 124 — Commercial business — 4 — — 4 — Total 7,978 8,421 — 1,003 1,431 — With an allowance recorded: One-to-four family 3,179 3,399 40 3,464 3,718 47 Multi-family 114 114 1 115 115 1 Commercial real estate 792 800 114 815 821 128 Construction and land 50 75 1 52 76 1 Home equity 267 335 7 270 338 8 Other consumer 101 110 25 59 67 9 Commercial business 864 864 586 283 283 3 Total 5,367 5,697 774 5,058 5,418 197 Total impaired loans: One-to-four family 3,644 3,922 40 3,846 4,125 47 Multi-family 114 114 1 115 115 1 Commercial real estate 4,218 4,279 114 1,071 1,199 128 Construction and land 3,779 3,806 1 52 79 1 Home equity 625 842 7 635 853 8 Other consumer 101 287 25 59 191 9 Commercial business 864 868 586 283 287 3 Total $ 13,345 $ 14,118 $ 774 $ 6,061 $ 6,849 $ 197 The following table presents the average recorded investment in loans individually evaluated for impairment and the related interest income recognized for the periods shown: Three Months Ended Three Months Ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) With no allowance recorded: One-to-four family $ 408 $ 8 $ 1,512 $ 27 Commercial real estate 2,389 27 310 1 Construction and land 2,487 68 — — Home equity 361 4 301 6 Other consumer — 5 — 1 Total 5,645 112 2,123 35 With an allowance recorded: One-to-four family 3,381 66 4,022 75 Multi-family 114 1 119 1 Commercial real estate 795 10 1,293 17 Construction and land 51 3 9 — Home equity 286 6 376 7 Other consumer 101 2 30 — Commercial business 675 3 338 4 Total 5,403 91 6,187 104 Total impaired loans: One-to-four family 3,789 74 5,534 102 Multi-family 114 1 119 1 Commercial real estate 3,184 37 1,603 18 Construction and land 2,538 71 9 — Home equity 647 10 677 13 Other consumer 101 7 30 1 Commercial business 675 3 338 4 Total $ 11,048 $ 203 $ 8,310 $ 139
Schedule of recorded investments in nonaccrual loans	The following table presents the recorded investment in nonaccrual loans by class of loan at the dates indicated: March 31, 2018 December 31, 2017 (In thousands) One-to-four family $ 820 $ 681 Commercial real estate 260 378 Construction and land 50 52 Home equity 359 365 Other consumer 101 59 Commercial business 583 — Total nonaccrual loans $ 2,173 $ 1,535
Schedule of past due loans by class	The following table presents past due loans, net of partial loan charge-offs, by class, as of March 31, 2018 : 30-59 Past Due 60-89 Past Due 90 Days Past Due Total Past Due Current Total Loans (In thousands) Real Estate: One-to-four family $ 1,656 $ — $ 201 $ 1,857 $ 345,596 $ 347,453 Multi-family — — — — 68,095 68,095 Commercial real estate — — — — 220,542 220,542 Construction and land 38 — — 38 75,646 75,684 Total real estate loans 1,694 — 201 1,895 709,879 711,774 Consumer: Home equity 453 5 — 458 38,080 38,538 Other consumer 145 46 27 218 39,260 39,478 Total consumer loans 598 51 27 676 77,340 78,016 Commercial business loans — — 583 583 15,580 16,163 Total loans $ 2,292 $ 51 $ 811 $ 3,154 $ 802,799 $ 805,953 The following table presents past due loans, net of partial loan charge-offs, by class, as of December 31, 2017 : 30-59 Past Due 60-89 Past Due 90 Days Past Due Total Past Due Current Total Loans (In thousands) Real Estate: One-to-four family $ 213 $ — $ 231 $ 444 $ 354,947 $ 355,391 Multi-family — — — — 73,767 73,767 Commercial real estate 91 — — 91 202,865 202,956 Construction and land 1,187 — 19 1,206 69,939 71,145 Total real estate loans 1,491 — 250 1,741 701,518 703,259 Consumer: Home equity 383 78 — 461 38,012 38,473 Other consumer 77 30 — 107 27,999 28,106 Total consumer loans 460 108 — 568 66,011 66,579 Commercial business loans 648 — — 648 15,655 16,303 Total loans $ 2,599 $ 108 $ 250 $ 2,957 $ 783,184 $ 786,141
Schedule of risk category of loans	The following table represents the internally assigned grade as of March 31, 2018 , by class of loans: Pass Watch Special Mention Sub- Standard Loss Total (In thousands) Real Estate: One-to-four family $ 340,762 $ 4,830 $ 660 $ 1,201 $ — $ 347,453 Multi-family 67,981 — 114 — — 68,095 Commercial real estate 206,082 10,015 755 3,690 — 220,542 Construction and land 65,577 6,314 — 3,793 — 75,684 Total real estate loans 680,402 21,159 1,529 8,684 — 711,774 Consumer: Home equity 37,492 417 99 530 — 38,538 Other consumer 39,031 165 81 190 11 39,478 Total consumer loans 76,523 582 180 720 11 78,016 Commercial business loans 14,346 953 281 583 — 16,163 Total loans $ 771,271 $ 22,694 $ 1,990 $ 9,987 $ 11 $ 805,953 The following table represents the internally assigned grade as of December 31, 2017 , by class of loans: Pass Watch Special Mention Sub- Standard Total (In thousands) Real Estate: One-to-four family $ 348,273 $ 4,134 $ 1,580 $ 1,404 $ 355,391 Multi-family 71,535 2,117 115 — 73,767 Commercial real estate 188,251 9,893 964 3,848 202,956 Construction and land 59,360 8,040 3,662 83 71,145 Total real estate loans 667,419 24,184 6,321 5,335 703,259 Consumer: Home equity 37,502 323 93 555 38,473 Other consumer 27,646 202 146 112 28,106 Total consumer loans 65,148 525 239 667 66,579 Commercial business loans 14,230 653 772 648 16,303 Total loans $ 746,797 $ 25,362 $ 7,332 $ 6,650 $ 786,141 The following table represents the credit risk profile based on payment activity as of March 31, 2018 , by class of loans: Nonperforming Performing Total (In thousands) Real Estate: One-to-four family $ 820 $ 346,633 $ 347,453 Multi-family — 68,095 68,095 Commercial real estate 260 220,282 220,542 Construction and land 50 75,634 75,684 Consumer: Home equity 359 38,179 38,538 Other consumer 101 39,377 39,478 Commercial business 583 15,580 16,163 Total loans $ 2,173 $ 803,780 $ 805,953 The following table represents the credit risk profile based on payment activity as of December 31, 2017 , by class of loans: Nonperforming Performing Total (In thousands) Real Estate: One-to-four family $ 681 $ 354,710 $ 355,391 Multi-family — 73,767 73,767 Commercial real estate 378 202,578 202,956 Construction and land 52 71,093 71,145 Consumer: Home equity 365 38,108 38,473 Other consumer 59 28,047 28,106 Commercial business — 16,303 16,303 Total loans $ 1,535 $ 784,606 $ 786,141
Schedule of troubled debt restructured loans	The following table presents TDR loans by class at the dates indicated by accrual and nonaccrual status. March 31, 2018 December 31, 2017 Accrual Nonaccrual Total Accrual Nonaccrual Total (In thousands) One-to-four family $ 2,824 $ 265 $ 3,089 $ 3,165 $ 176 $ 3,341 Multi-family 114 — 114 115 — 115 Commercial real estate 685 107 792 693 217 910 Home equity 267 — 267 270 — 270 Commercial business 281 — 281 283 — 283 Total TDR loans $ 4,171 $ 372 $ 4,543 $ 4,526 $ 393 $ 4,919 The following table is a summary of information pertaining to TDR loans included in impaired loans at the dates indicated: March 31, December 31, 2018 2017 (In thousands) Total TDR loans $ 4,543 $ 4,919 Allowance for loan losses related to TDR loans 159 182 Total nonaccrual TDR loans 372 393 The following table presents newly restructured and renewals or modifications of existing TDR loans by class that occurred during the three months ended March 31, 2018 , by type of concession granted. Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) Pre-modification outstanding recorded investment One- to four-family 2 $ — $ — $ 180 $ 180 2 $ — $ — $ 180 $ 180 Post-modification outstanding recorded investment One- to four-family 2 $ — $ — $ 179 $ 179 2 $ — $ — $ 179 $ 179 There were no TDR loans which incurred a payment default within 12 months of the restructure date during the three months ended March 31, 2018 . The following table presents newly restructured and renewals or modifications of existing TDR loans by class that occurred during the three months ended March 31, 2017 , by type of concession granted. Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) Pre-modification outstanding recorded investment One- to four-family 2 $ 95 $ 89 $ — $ 184 Commercial real estate 1 — — 134 134 3 $ 95 $ 89 $ 134 $ 318 Post-modification outstanding recorded investment One- to four-family 2 $ 94 $ 88 $ — $ 182 Commercial real estate 1 — — 134 134 3 $ 94 $ 88 $ 134 $ 316 The following is a summary of TDR loans which incurred a payment default within 12 months of the restructure date during the three months ended March 31, 2017 . Number of Contracts Rate Modification Term Modification Combination Total Modifications (Dollars in thousands) TDR loans that subsequently defaulted One- to four-family 1 $ — $ — $ 50 $ 50

Deposits - (Tables)

Deposits - (Tables)	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
Schedule of deposits	Deposits and weighted-average interest rates at the dates indicated are as follows: Weighted-Average Interest Rate March 31, 2018 Weighted-Average Interest Rate December 31, 2017 (Dollars in thousands) Savings 0.10% $ 107,758 0.05% $ 103,243 Transaction accounts 0.01% 261,001 0.01% 272,484 Money market accounts 0.32% 271,729 0.33% 270,052 Certificates of deposit and jumbo certificates 1.30% 240,134 1.27% 239,253 $ 880,622 $ 885,032 Weighted-average interest rate 0.47 % 0.45 %
Schedule of maturities of time deposits	Maturities of certificates at the dates indicated are as follows: March 31, 2018 December 31, 2017 (In thousands) Within one year or less $ 154,303 $ 139,613 After one year through two years 50,800 61,906 After two years through three years 19,997 20,732 After three years through four years 9,820 10,089 After four years through five years 5,187 6,886 After five years 27 27 $ 240,134 $ 239,253
Schedule of interest on deposits	Interest on deposits by type for the periods shown was as follows: Three Months Ended March 31, 2018 2017 (In thousands) Savings $ 16 $ 9 Transaction accounts 4 4 Insured money market accounts 215 212 Certificates of deposit and jumbo certificates 750 493 $ 985 $ 718

Earnings per Share - (Tables)

Earnings per Share - (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of earnings per share	The following table presents a reconciliation of the components used to compute basic and diluted earnings per share for the three months ended March 31, 2018 and 2017 . Three Months Ended March 31, 2018 2017 (In thousands, except share data) Numerator: Net income $ 1,523 $ 2,164 Denominator: Basic weighted average common shares outstanding 10,491,647 10,812,035 Dilutive restricted stock grants 113,009 107,706 Diluted weighted average common shares outstanding 10,604,656 10,919,741 Basic earnings per share $ 0.15 $ 0.20 Diluted earnings per share $ 0.14 $ 0.20

Employee Benefits - (Tables)

Employee Benefits - (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Employee Stock Ownership (ESOP)	Shares issued to the ESOP as of the dates indicated are as follows: March 31, 2018 December 31, 2017 (Dollars in thousands) Allocated shares 121,695 121,695 Committed to be released shares 39,663 26,442 Unallocated shares 886,671 899,892 Total ESOP shares issued 1,048,029 1,048,029 Fair value of unallocated shares $ 14,976 $ 14,668

Stock-based Compensation - (Tab

Stock-based Compensation - (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of changes in non-vested restricted stock awards	The following tables provide a summary of changes in non-vested restricted stock awards for the periods shown: For the Three Months Ended March 31, 2018 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2018 347,600 $ 13.18 Granted — — Vested — — Canceled (1) — — Non-vested at March 31, 2018 347,600 13.18 (1) A surrender of vested stock awards by a participant surrendering the number of shares valued at the current stock price at the vesting date to cover the total cost of the vested shares. The surrendered shares are canceled and are unavailable for reissue. For the Three Months Ended March 31, 2017 Weighted-Average Grant Date Shares Fair Value Non-vested at January 1, 2017 390,000 $ 12.70 Granted — — Vested — — Forfeited — — Non-vested at March 31, 2017 390,000 12.70

Fair Value Accounting and Mea26

Fair Value Accounting and Measurement - (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The following tables show the Company’s assets measured at fair value on a recurring basis at the dates indicated: March 31, 2018 Quoted Prices in or Liabilities Significant Inputs Significant Inputs (Level 1) (Level 2) (Level 3) Total (In thousands) Securities available-for-sale Municipal bonds $ — $ 10,624 $ — $ 10,624 ABS agency — 16,089 — 16,089 ABS corporate — 22,692 — 22,692 Corporate debt — 10,040 — 10,040 SBA — 40,349 — 40,349 MBS agency — 140,172 — 140,172 MBS corporate — 18,252 — 18,252 $ — $ 258,218 $ — $ 258,218 December 31, 2017 Quoted Prices in Significant Significant (Level 1) (Level 2) (Level 3) Total (In thousands) Securities available-for-sale Municipal bonds $ — $ 13,434 $ — $ 13,434 ABS agency — 21,770 — 21,770 ABS corporate — 22,768 — 22,768 Corporate debt — 19,908 — 19,908 SBA — 47,274 — 47,274 MBS agency — 144,542 — 144,542 MBS corporate — 20,546 — 20,546 $ — $ 290,242 $ — $ 290,242
Schedule of assets measured at fair value on a nonrecurring basis	The following tables present the Company’s assets measured at fair value on a nonrecurring basis at the dates indicated: March 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Impaired loans $ — $ — $ 13,345 $ 13,345 December 31, 2017 Level 1 Level 2 Level 3 Total (In thousands) Impaired loans $ — $ — $ 6,061 $ 6,061
Schedule of the carrying value and estimated fair value of financial instruments	The following tables present the carrying value and estimated fair value of financial instruments at the dates indicated: March 31, 2018 Carrying Amount Estimated Fair Value Fair Value Measurements Using: Level 1 Level 2 Level 3 (In thousands) Financial assets Cash and cash equivalents $ 25,150 $ 25,150 $ 25,150 $ — $ — Investment securities available for sale 258,218 258,218 — 258,218 — Investment securities held to maturity 47,709 47,267 — 47,267 — Loans receivable, net 798,828 776,640 — — 776,640 FHLB stock 6,389 6,389 — 6,389 — Accrued interest receivable 3,641 3,641 — 3,641 — Mortgage servicing rights, net 1,104 1,821 — — 1,821 Financial liabilities Demand deposits $ 640,488 $ 640,488 $ 640,488 $ — $ — Time deposits 240,134 237,823 — 237,823 — Borrowings 122,949 124,029 — 124,029 — Accrued interest payable 210 210 — 210 — — December 31, 2017 Carrying Amount Estimated Fair Value Fair Value Measurements Using: Level 1 Level 2 Level 3 (In thousands) Financial assets Cash and cash equivalents $ 36,801 $ 36,801 $ 36,801 $ — $ — Investment securities available for sale 290,242 290,242 — 290,242 — Investment securities held to maturity 50,126 50,266 — 50,266 — Loans held for sale 788 788 — 788 — Loans receivable, net 779,111 768,181 — — 768,181 FHLB stock 7,023 7,023 — 7,023 — Accrued interest receivable 3,745 3,745 — 3,745 — Mortgage servicing rights, net 1,095 1,669 — — 1,669 Financial liabilities Demand deposits $ 645,779 $ 645,779 $ 645,779 $ — $ — Time deposits 239,253 237,841 — 237,841 — Borrowings 144,100 145,892 — 145,892 — Accrued interest payable 325 325 — 325 —

Non-interest Income - (Tables)

Non-interest Income - (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule Of Non-interest Income	The Company has included the following table regarding the Company’s non-interest income for the periods presented. Three Months Ended March 31, 2018 2017 (In thousands) Non-interest income: Loan fees (1) $ 125 $ 96 Deposit fees 392 400 Debit interchange income 32 37 Credit card interchange income 406 357 Investment securities gain (loss), net (1) 122 — Gain on loan sales, net (1) 167 284 Increase in cash surrender value of bank-owned life ins (1) 149 178 Income from bank-owned life insurance payout (1) — 768 Other income: Investment services revenue 74 87 Gain or loss on subsidiary (1) 14 — Remaining other income 1 (6 ) Total other income 89 81 Total non-interest income $ 1,482 $ 2,201 (1) Not within scope of ASC 606

Basis of Presentation and Cri28

Basis of Presentation and Critical Accounting Policies - (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 29, 2015	Dec. 18, 2015
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares issued (in shares)	13,100,360
Gross proceeds from stock offering	$ 121.7
Proceeds from initial public offering	117.6
Capital contribution to subsidiary	$ 58.4
Percentage of shares to be purchased	8.00%
Number of shares to be purchased (in shares)		1,048,029
Contributions to charitable organization
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Value of charitable consideration, cash portion	$ 0.4
IPO
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares issued (in shares)	12,167,000
Share price (in dollars per share)	$ 10
Secondary Offering | Contributions to charitable organization
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares issued (in shares)	933,360

Securities - Amortized Cost, Gr

Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available for Sale
Amortized Cost	$ 262,993	$ 292,266
Gross Unrealized Gains	438	774
Gross Unrealized Losses	(5,213)	(2,798)
Estimated Fair Value	258,218	290,242
Held to Maturity
Amortized Cost	47,709	50,126
Gross Unrealized Gains	200	494
Gross Unrealized Losses	(642)	(354)
Estimated Fair Value	47,267	50,266
Investment Securities
Available for Sale
Amortized Cost	100,114	125,013
Estimated Fair Value	99,794	125,154
Held to Maturity
Estimated Fair Value	12,595	14,514
Investment Securities | Municipal bonds
Available for Sale
Amortized Cost	10,523	13,058
Gross Unrealized Gains	124	391
Gross Unrealized Losses	(23)	(15)
Estimated Fair Value	10,624	13,434
Held to Maturity
Amortized Cost	12,121	13,963
Gross Unrealized Gains	114	156
Gross Unrealized Losses	(6)	0
Estimated Fair Value	12,229	14,119
Investment Securities | U.S. government agency issued asset-backed securities (ABS agency)
Available for Sale
Amortized Cost	16,266	21,972
Gross Unrealized Gains	22	36
Gross Unrealized Losses	(199)	(238)
Estimated Fair Value	16,089	21,770
Investment Securities | Corporate issued asset-backed securities (ABS corporate)
Available for Sale
Amortized Cost	22,818	22,823
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(126)	(55)
Estimated Fair Value	22,692	22,768
Investment Securities | Corporate issued debt securities (Corporate debt)
Available for Sale
Amortized Cost	9,986	19,835
Gross Unrealized Gains	213	195
Gross Unrealized Losses	(159)	(122)
Estimated Fair Value	10,040	19,908
Investment Securities | U.S. Small Business Administration securities (SBA)
Available for Sale
Amortized Cost	40,521	47,325
Gross Unrealized Gains	53	98
Gross Unrealized Losses	(225)	(149)
Estimated Fair Value	40,349	47,274
Held to Maturity
Amortized Cost	368	399
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(4)
Estimated Fair Value	366	395
Mortgage-backed Securities
Available for Sale
Amortized Cost	162,879	167,253
Estimated Fair Value	158,424	165,088
Held to Maturity
Estimated Fair Value	34,672	35,752
Mortgage-backed Securities | U.S. government agency issued mortgage-backed securities (MBS agency)
Available for Sale
Amortized Cost	144,359	146,532
Gross Unrealized Gains	12	36
Gross Unrealized Losses	(4,199)	(2,026)
Estimated Fair Value	140,172	144,542
Held to Maturity
Amortized Cost	35,220	35,764
Gross Unrealized Gains	86	338
Gross Unrealized Losses	(634)	(350)
Estimated Fair Value	34,672	35,752
Mortgage-backed Securities | Corporate issued mortgage-backed securities (MBS corporate)
Available for Sale
Amortized Cost	18,520	20,721
Gross Unrealized Gains	14	18
Gross Unrealized Losses	(282)	(193)
Estimated Fair Value	$ 18,252	$ 20,546

Securities - Securities in a Co

Securities - Securities in a Continuous Unrealized Gross Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gross Unrealized Losses
Less Than Twelve Months	$ (1,123)	$ (649)
Twelve Months or Longer	(4,090)	(2,149)
Gross Unrealized Losses	5,213	2,798
Fair Value
Less Than Twelve Months	85,142	102,218
Twelve Months or Longer	125,637	111,068
Fair Value	210,779	213,286
Fair Value
Less Than Twelve Months	14,346	1,396
Twelve Months or Longer	19,125	18,494
Total	33,471	19,890
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than Twelve Months	(120)	(10)
Twelve Months or Longer	(522)	(344)
Total	(642)	(354)
Investment Securities | Municipal bonds
Gross Unrealized Losses
Less Than Twelve Months	(16)	(11)
Twelve Months or Longer	(7)	(4)
Gross Unrealized Losses	23	15
Fair Value
Less Than Twelve Months	4,270	4,276
Twelve Months or Longer	110	114
Fair Value	4,380	4,390
Fair Value
Less Than Twelve Months	315
Twelve Months or Longer	962
Total	1,277
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than Twelve Months	0
Twelve Months or Longer	(6)
Total	(6)
Investment Securities | ABS agency
Gross Unrealized Losses
Less Than Twelve Months	(62)	0
Twelve Months or Longer	(137)	(238)
Gross Unrealized Losses	199	238
Fair Value
Less Than Twelve Months	8,856	0
Twelve Months or Longer	2,617	7,294
Fair Value	11,473	7,294
Investment Securities | ABS corporate
Gross Unrealized Losses
Less Than Twelve Months	(126)	(55)
Twelve Months or Longer	0	0
Gross Unrealized Losses	126	55
Fair Value
Less Than Twelve Months	22,692	22,768
Twelve Months or Longer	0	0
Fair Value	22,692	22,768
Investment Securities | Corporate debt
Gross Unrealized Losses
Less Than Twelve Months	(159)	(122)
Twelve Months or Longer	0	0
Gross Unrealized Losses	159	122
Fair Value
Less Than Twelve Months	4,827	4,864
Twelve Months or Longer	0	0
Fair Value	4,827	4,864
Investment Securities | SBA
Gross Unrealized Losses
Less Than Twelve Months	(59)	(45)
Twelve Months or Longer	(166)	(104)
Gross Unrealized Losses	225	149
Fair Value
Less Than Twelve Months	7,199	7,421
Twelve Months or Longer	7,268	8,067
Fair Value	14,467	15,488
Fair Value
Less Than Twelve Months	366	395
Twelve Months or Longer	0	0
Total	366	395
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than Twelve Months	(2)	(4)
Twelve Months or Longer	0	0
Total	(2)	(4)
Mortgage-backed Securities | MBS agency
Gross Unrealized Losses
Less Than Twelve Months	(613)	(394)
Twelve Months or Longer	(3,586)	(1,632)
Gross Unrealized Losses	4,199	2,026
Fair Value
Less Than Twelve Months	29,138	57,081
Twelve Months or Longer	109,328	85,421
Fair Value	138,466	142,502
Fair Value
Less Than Twelve Months	13,665	1,001
Twelve Months or Longer	18,163	18,494
Total	31,828	19,495
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than Twelve Months	(118)	(6)
Twelve Months or Longer	(516)	(344)
Total	(634)	(350)
Mortgage-backed Securities | MBS corporate
Gross Unrealized Losses
Less Than Twelve Months	(88)	(22)
Twelve Months or Longer	(194)	(171)
Gross Unrealized Losses	282	193
Fair Value
Less Than Twelve Months	8,160	5,808
Twelve Months or Longer	6,314	10,172
Fair Value	$ 14,474	$ 15,980

Securities - Narrative (Details

Securities - Narrative (Details)	3 Months Ended
	Mar. 31, 2018USD ($)security	Mar. 31, 2017USD ($)	Dec. 31, 2017security
Investments, Debt and Equity Securities [Abstract]
Number of securities in an unrealized loss position | security	68		63
OTTI losses | $	$ 0	$ 0

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value by Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities, Amortized Cost
Amortized Cost	$ 262,993	$ 292,266
Available-for-sale Securities, Estimated Fair Value
Total	258,218	290,242
Held-to-maturity Securities, Amortized Cost
Total	47,709	50,126
Held-to-maturity Securities, Estimated Fair Value
Total	47,267	50,266
Mortgage-backed Securities
Available-for-sale Securities, Amortized Cost
Due within one year	0	0
Due after one through five years	7,323	7,363
Due after five through ten years	13,023	13,337
Due after ten years	142,533	146,553
Amortized Cost	162,879	167,253
Available-for-sale Securities, Estimated Fair Value
Due within one year	0	0
Due after one through five years	7,102	7,260
Due after five through ten years	12,618	13,127
Due after ten years	138,704	144,701
Total	158,424	165,088
Held-to-maturity Securities, Amortized Cost
Due within one year	0	0
Due after one through five years	1,688	1,957
Due after five through ten years	2,676	2,835
Due after ten years	30,856	30,972
Total	35,220	35,764
Held-to-maturity Securities, Estimated Fair Value
Due within one year	0	0
Due after one through five years	1,686	1,973
Due after five through ten years	2,603	2,792
Due after ten years	30,383	30,987
Total	34,672	35,752
Investment Securities
Available-for-sale Securities, Amortized Cost
Due within one year	0	0
Due after one through five years	4,286	4,388
Due after five through ten years	18,531	29,482
Due after ten years	77,297	91,143
Amortized Cost	100,114	125,013
Available-for-sale Securities, Estimated Fair Value
Due within one year	0	0
Due after one through five years	4,270	4,380
Due after five through ten years	18,517	29,661
Due after ten years	77,007	91,113
Total	99,794	125,154
Held-to-maturity Securities, Amortized Cost
Due within one year	0	0
Due after one through five years	742	0
Due after five through ten years	6,904	9,491
Due after ten years	4,843	4,871
Total	12,489	14,362
Held-to-maturity Securities, Estimated Fair Value
Due within one year	0	0
Due after one through five years	751	0
Due after five through ten years	6,939	9,574
Due after ten years	4,905	4,940
Total	$ 12,595	$ 14,514

Securities - Sale of Available-

Securities - Sale of Available-for-sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 32,859	$ 0
Gross realized gains	164	0
Gross realized losses	$ (42)	$ 0

Loans Receivable - Balance of L

Loans Receivable - Balance of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 805,953	$ 786,141
Net deferred loan fees	501	724
Premium on purchased loans, net	(2,360)	(2,454)
Allowance for loan losses	8,984	8,760	$ 8,328	$ 8,060
Total loans receivable, net	798,828	779,111
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	711,774	703,259
Real Estate | Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	347,453	355,391
Allowance for loan losses	3,167	3,061	3,064	2,892
Real Estate | Real estate loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	68,095	73,767
Allowance for loan losses	647	648	498	370
Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	220,542	202,956
Allowance for loan losses	2,053	1,847	1,672	1,488
Real Estate | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	75,684	71,145
Allowance for loan losses	679	648	689	585
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	78,016	66,579
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,538	38,473
Allowance for loan losses	744	787	782	794
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	39,478	28,106
Allowance for loan losses	948	712	448	361
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,163	16,303
Allowance for loan losses	$ 709	$ 265	$ 1,148	$ 652

Loans Receivable - Allowance fo

Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 8,760	$ 8,060
Provision for loan losses	310	215
Charge-offs	(123)	(112)
Recoveries	37	165
Ending balance	8,984	8,328
Total ALLL	8,760	8,328	$ 8,984	$ 8,760
General reserve			8,210	8,563
Specific reserve			774	197
Total Loans			805,953	786,141
General reserves			792,608	780,080
Specific reserves			13,345	6,061
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Total Loans			711,774	703,259
Real Estate | Real estate loans | One-to-four family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,061	2,892
Provision for loan losses	105	147
Charge-offs	0	0
Recoveries	1	25
Ending balance	3,167	3,064
Total ALLL	3,061	3,064	3,167	3,061
General reserve			3,127	3,014
Specific reserve			40	47
Total Loans			347,453	355,391
General reserves			343,809	351,545
Specific reserves			3,644	3,846
Real Estate | Real estate loans | Multi-family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	648	370
Provision for loan losses	(1)	128
Charge-offs	0	0
Recoveries	0	0
Ending balance	647	498
Total ALLL	648	498	647	648
General reserve			646	647
Specific reserve			1	1
Total Loans			68,095	73,767
General reserves			67,981	73,652
Specific reserves			114	115
Real Estate | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,847	1,488
Provision for loan losses	206	184
Charge-offs	0	0
Recoveries	0	0
Ending balance	2,053	1,672
Total ALLL	1,847	1,672	2,053	1,847
General reserve			1,939	1,719
Specific reserve			114	128
Total Loans			220,542	202,956
General reserves			216,324	201,885
Specific reserves			4,218	1,071
Real Estate | Construction and land
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	648	585
Provision for loan losses	31	104
Charge-offs	0	0
Recoveries	0	0
Ending balance	679	689
Total ALLL	648	689	679	648
General reserve			678	647
Specific reserve			1	1
Total Loans			75,684	71,145
General reserves			71,905	71,093
Specific reserves			3,779	52
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Total Loans			78,016	66,579
Consumer | Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	787	794
Provision for loan losses	(51)	(58)
Charge-offs	0	(79)
Recoveries	8	125
Ending balance	744	782
Total ALLL	787	782	744	787
General reserve			737	779
Specific reserve			7	8
Total Loans			38,538	38,473
General reserves			37,913	37,838
Specific reserves			625	635
Consumer | Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	712	361
Provision for loan losses	331	106
Charge-offs	(123)	(33)
Recoveries	28	14
Ending balance	948	448
Total ALLL	712	448	948	712
General reserve			923	703
Specific reserve			25	9
Total Loans			39,478	28,106
General reserves			39,377	28,047
Specific reserves			101	59
Commercial business
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	265	652
Provision for loan losses	444	495
Charge-offs	0	0
Recoveries	0	1
Ending balance	709	1,148
Total ALLL	265	1,148	709	265
General reserve			123	262
Specific reserve			586	3
Total Loans			16,163	16,303
General reserves			15,299	16,020
Specific reserves			864	283
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	792	918
Provision for loan losses	(755)	(891)
Charge-offs	0	0
Recoveries	0	0
Ending balance	37	27
Total ALLL	$ 792	$ 27	37	792
General reserve			37	792
Specific reserve			0	0
Total Loans			0	0
General reserves			0	0
Specific reserves			$ 0	$ 0

Loans Receivable - Impaired Loa

Loans Receivable - Impaired Loans By Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Recorded Investment
Recorded Investment, No Allowance Recorded	$ 7,978		$ 1,003
Recorded Investment, Allowance Recorded	5,367		5,058
Recorded Investment	13,345		6,061
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	8,421		1,431
Unpaid Principal Balance, Allowance Recorded	5,697		5,418
Unpaid Principal Balance	14,118		6,849
Related Allowance	774		197
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	5,645	$ 2,123
Average Recorded Investment, Allowance Recorded	5,403	6,187
Average Recorded Investment	11,048	8,310
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	112	35
Interest Income Recognized, Allowance Recorded	91	104
Interest Income Recognized	203	139
Real Estate | Real estate loans | One-to-four family
Recorded Investment
Recorded Investment, No Allowance Recorded	465		382
Recorded Investment, Allowance Recorded	3,179		3,464
Recorded Investment	3,644		3,846
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	523		407
Unpaid Principal Balance, Allowance Recorded	3,399		3,718
Unpaid Principal Balance	3,922		4,125
Related Allowance	40		47
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	408	1,512
Average Recorded Investment, Allowance Recorded	3,381	4,022
Average Recorded Investment	3,789	5,534
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	8	27
Interest Income Recognized, Allowance Recorded	66	75
Interest Income Recognized	74	102
Real Estate | Real estate loans | Multi-family
Recorded Investment
Recorded Investment, Allowance Recorded	114		115
Recorded Investment	114		115
Unpaid Principal Balance
Unpaid Principal Balance, Allowance Recorded	114		115
Unpaid Principal Balance	114		115
Related Allowance	1		1
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, Allowance Recorded	114	119
Average Recorded Investment	114	119
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, Allowance Recorded	1	1
Interest Income Recognized	1	1
Real Estate | Commercial real estate
Recorded Investment
Recorded Investment, No Allowance Recorded	3,426		256
Recorded Investment, Allowance Recorded	792		815
Recorded Investment	4,218		1,071
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	3,479		378
Unpaid Principal Balance, Allowance Recorded	800		821
Unpaid Principal Balance	4,279		1,199
Related Allowance	114		128
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	2,389	310
Average Recorded Investment, Allowance Recorded	795	1,293
Average Recorded Investment	3,184	1,603
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	27	1
Interest Income Recognized, Allowance Recorded	10	17
Interest Income Recognized	37	18
Real Estate | Construction and land
Recorded Investment
Recorded Investment, No Allowance Recorded	3,729		0
Recorded Investment, Allowance Recorded	50		52
Recorded Investment	3,779		52
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	3,731		3
Unpaid Principal Balance, Allowance Recorded	75		76
Unpaid Principal Balance	3,806		79
Related Allowance	1		1
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	2,487	0
Average Recorded Investment, Allowance Recorded	51	9
Average Recorded Investment	2,538	9
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	68	0
Interest Income Recognized, Allowance Recorded	3	0
Interest Income Recognized	71	0
Consumer | Home equity
Recorded Investment
Recorded Investment, No Allowance Recorded	358		365
Recorded Investment, Allowance Recorded	267		270
Recorded Investment	625		635
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	507		515
Unpaid Principal Balance, Allowance Recorded	335		338
Unpaid Principal Balance	842		853
Related Allowance	7		8
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	361	301
Average Recorded Investment, Allowance Recorded	286	376
Average Recorded Investment	647	677
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	4	6
Interest Income Recognized, Allowance Recorded	6	7
Interest Income Recognized	10	13
Consumer | Other
Recorded Investment
Recorded Investment, No Allowance Recorded	0		0
Recorded Investment, Allowance Recorded	101		59
Recorded Investment	101		59
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	177		124
Unpaid Principal Balance, Allowance Recorded	110		67
Unpaid Principal Balance	287		191
Related Allowance	25		9
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Allowance Recorded	0	0
Average Recorded Investment, Allowance Recorded	101	30
Average Recorded Investment	101	30
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, No Allowance Recorded	5	1
Interest Income Recognized, Allowance Recorded	2	0
Interest Income Recognized	7	1
Commercial business
Recorded Investment
Recorded Investment, No Allowance Recorded	0		0
Recorded Investment, Allowance Recorded	864		283
Recorded Investment	864		283
Unpaid Principal Balance
Unpaid Principal Balance, No Allowance Recorded	4		4
Unpaid Principal Balance, Allowance Recorded	864		283
Unpaid Principal Balance	868		287
Related Allowance	586		$ 3
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, Allowance Recorded	675	338
Average Recorded Investment	675	338
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, Allowance Recorded	3	4
Interest Income Recognized	$ 3	$ 4

Loans Receivable - Narrative (D

Loans Receivable - Narrative (Details)	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized on a cash basis for impaired loans	$ 166,000	$ 88,000
Loans	$ 805,953,000		$ 786,141,000
Number of contracts | contract	0
Troubled debt restructuring, debtor, subsequent periods, contingent payments, amount	$ 0
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0		$ 0

Loans Receivable - Nonaccrual L

Loans Receivable - Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	$ 2,173	$ 1,535
Real Estate | Real estate loans | One-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	820	681
Real Estate | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	260	378
Real Estate | Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	50	52
Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	359	365
Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	101	59
Consumer | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, nonaccrual loans	$ 583	$ 0

Loans Receivable - Reconciliati

Loans Receivable - Reconciliation of Past Due Loans (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 3,154,000	$ 2,957,000
Current	802,799,000	783,184,000
Total Loans	805,953,000	786,141,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,292,000	2,599,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	51,000	108,000
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	811,000	250,000
Total Loans	0	0
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,895,000	1,741,000
Current	709,879,000	701,518,000
Total Loans	711,774,000	703,259,000
Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,694,000	1,491,000
Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	201,000	250,000
Real Estate | Real estate loans | One-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,857,000	444,000
Current	345,596,000	354,947,000
Total Loans	347,453,000	355,391,000
Real Estate | Real estate loans | One-to-four family | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,656,000	213,000
Real Estate | Real estate loans | One-to-four family | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Real estate loans | One-to-four family | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	201,000	231,000
Real Estate | Real estate loans | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	68,095,000	73,767,000
Total Loans	68,095,000	73,767,000
Real Estate | Real estate loans | Multi-family | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Real estate loans | Multi-family | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Real estate loans | Multi-family | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	91,000
Current	220,542,000	202,865,000
Total Loans	220,542,000	202,956,000
Real Estate | Commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	91,000
Real Estate | Commercial real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Commercial real estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38,000	1,206,000
Current	75,646,000	69,939,000
Total Loans	75,684,000	71,145,000
Real Estate | Construction and land | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38,000	1,187,000
Real Estate | Construction and land | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate | Construction and land | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	19,000
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	676,000	568,000
Current	77,340,000	66,011,000
Total Loans	78,016,000	66,579,000
Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	598,000	460,000
Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	51,000	108,000
Consumer | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	27,000	0
Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	458,000	461,000
Current	38,080,000	38,012,000
Total Loans	38,538,000	38,473,000
Consumer | Home equity | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	453,000	383,000
Consumer | Home equity | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,000	78,000
Consumer | Home equity | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	218,000	107,000
Current	39,260,000	27,999,000
Total Loans	39,478,000	28,106,000
Consumer | Other | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	145,000	77,000
Consumer | Other | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	46,000	30,000
Consumer | Other | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	27,000	0
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	583,000	648,000
Current	15,580,000	15,655,000
Total Loans	16,163,000	16,303,000
Commercial business | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	648,000
Commercial business | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial business | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 583,000	$ 0

Loans Receivable - Credit Quali

Loans Receivable - Credit Quality Indicators by Class of Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 805,953	$ 786,141
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	771,271	746,797
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	22,694	25,362
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,990	7,332
Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	9,987	6,650
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	11
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	2,173	1,535
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	803,780	784,606
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	711,774	703,259
Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	680,402	667,419
Real Estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	21,159	24,184
Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,529	6,321
Real Estate | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	8,684	5,335
Real Estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Real Estate | Real estate loans | One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans	347,453	355,391
Real Estate | Real estate loans | One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	340,762	348,273
Real Estate | Real estate loans | One-to-four family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	4,830	4,134
Real Estate | Real estate loans | One-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	660	1,580
Real Estate | Real estate loans | One-to-four family | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	1,201	1,404
Real Estate | Real estate loans | One-to-four family | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Real Estate | Real estate loans | One-to-four family | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	820	681
Real Estate | Real estate loans | One-to-four family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	346,633	354,710
Real Estate | Real estate loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans	68,095	73,767
Real Estate | Real estate loans | Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	67,981	71,535
Real Estate | Real estate loans | Multi-family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	0	2,117
Real Estate | Real estate loans | Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	114	115
Real Estate | Real estate loans | Multi-family | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate | Real estate loans | Multi-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Real Estate | Real estate loans | Multi-family | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate | Real estate loans | Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	68,095	73,767
Real Estate | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	220,542	202,956
Real Estate | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	206,082	188,251
Real Estate | Commercial real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	10,015	9,893
Real Estate | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	755	964
Real Estate | Commercial real estate | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	3,690	3,848
Real Estate | Commercial real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Real Estate | Commercial real estate | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	260	378
Real Estate | Commercial real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	220,282	202,578
Real Estate | Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans	75,684	71,145
Real Estate | Construction and land | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	65,577	59,360
Real Estate | Construction and land | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	6,314	8,040
Real Estate | Construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	3,662
Real Estate | Construction and land | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	3,793	83
Real Estate | Construction and land | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Real Estate | Construction and land | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	50	52
Real Estate | Construction and land | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	75,634	71,093
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	78,016	66,579
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	76,523	65,148
Consumer | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	582	525
Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	180	239
Consumer | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	720	667
Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	11
Consumer | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans	38,538	38,473
Consumer | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	37,492	37,502
Consumer | Home equity | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	417	323
Consumer | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	99	93
Consumer | Home equity | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	530	555
Consumer | Home equity | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Consumer | Home equity | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	359	365
Consumer | Home equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	38,179	38,108
Consumer | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	39,478	28,106
Consumer | Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	39,031	27,646
Consumer | Other | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	165	202
Consumer | Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	81	146
Consumer | Other | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	190	112
Consumer | Other | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	11
Consumer | Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	101	59
Consumer | Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	39,377	28,047
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Loans	16,163	16,303
Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	14,346	14,230
Commercial business | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans	953	653
Commercial business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	281	772
Commercial business | Sub- Standard
Financing Receivable, Recorded Investment [Line Items]
Loans	583	648
Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	0
Commercial business | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans	583	0
Commercial business | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 15,580	$ 16,303

Loans Receivable - Troubled Deb

Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract	Dec. 31, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Total TDR loans	$ 4,543		$ 4,919
Allowance for loan losses related to TDR loans	159		182
Total nonaccrual TDR loans	$ 372		393
Number of contracts | contract	0
Real Estate | Real estate loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract		1
Total Modifications		$ 50
Real Estate | Real estate loans | Rate Modification
Financing Receivable, Modifications [Line Items]
Total Modifications		0
Real Estate | Real estate loans | Term Modification
Financing Receivable, Modifications [Line Items]
Total Modifications		0
Real Estate | Real estate loans | Combination Modification
Financing Receivable, Modifications [Line Items]
Total Modifications		$ 50
Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Total TDR loans	$ 792		910
Total nonaccrual TDR loans	107		217
One-to-four family | Real Estate | Real estate loans
Financing Receivable, Modifications [Line Items]
Total TDR loans	3,089		3,341
Total nonaccrual TDR loans	$ 265		$ 176

Loans Receivable - Troubled D42

Loans Receivable - Troubled Debt Restructured Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Accrual loans	$ 4,171	$ 4,526
Nonaccrual loans	372	393
Total TDR loans	4,543	4,919
Real Estate | Real estate loans | One-to-four family
Financing Receivable, Modifications [Line Items]
Accrual loans	2,824	3,165
Nonaccrual loans	265	176
Total TDR loans	3,089	3,341
Real Estate | Real estate loans | Multi-family
Financing Receivable, Modifications [Line Items]
Accrual loans	114	115
Nonaccrual loans	0	0
Total TDR loans	114	115
Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Accrual loans	685	693
Nonaccrual loans	107	217
Total TDR loans	792	910
Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Accrual loans	267	270
Nonaccrual loans	0	0
Total TDR loans	267	270
Commercial business
Financing Receivable, Modifications [Line Items]
Accrual loans	281	283
Nonaccrual loans	0	0
Total TDR loans	$ 281	$ 283

Loans Receivable - Troubled D43

Loans Receivable - Troubled Debt Restructuring Schedule Of Modified Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification, number of contracts | contract	2	3
Financing receivable, modifications, pre-modification recorded investment	$ 180	$ 318
Financing receivable, modifications, post-modification, number of contracts | contract	2	3
Financing receivable, modifications, post-modification recorded investment	$ 179	$ 316
One-to-four family | Real Estate | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification, number of contracts | contract	2	2
Financing receivable, modifications, pre-modification recorded investment	$ 180	$ 184
Financing receivable, modifications, post-modification, number of contracts | contract	2	2
Financing receivable, modifications, post-modification recorded investment	$ 179	$ 182
Commercial real estate | Commercial business | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification, number of contracts | contract		1
Financing receivable, modifications, pre-modification recorded investment		$ 134
Financing receivable, modifications, post-modification, number of contracts | contract		1
Financing receivable, modifications, post-modification recorded investment		$ 134
Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	0	95
Financing receivable, modifications, post-modification recorded investment	0	94
Rate Modification | One-to-four family | Real Estate | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	0	95
Financing receivable, modifications, post-modification recorded investment	0	94
Rate Modification | Commercial real estate | Commercial business | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment		0
Financing receivable, modifications, post-modification recorded investment		0
Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	0	89
Financing receivable, modifications, post-modification recorded investment	0	88
Term Modification | One-to-four family | Real Estate | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	0	89
Financing receivable, modifications, post-modification recorded investment	0	88
Term Modification | Commercial real estate | Commercial business | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment		0
Financing receivable, modifications, post-modification recorded investment		0
Combination Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	180	134
Financing receivable, modifications, post-modification recorded investment	179	134
Combination Modification | One-to-four family | Real Estate | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment	180	0
Financing receivable, modifications, post-modification recorded investment	$ 179	0
Combination Modification | Commercial real estate | Commercial business | Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, pre-modification recorded investment		134
Financing receivable, modifications, post-modification recorded investment		$ 134

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Time deposits, $250,000 or more	$ 82.6	$ 82.3
Public fund deposits	53.2	56.2
Investment securities pledged as collateral, carrying value	$ 38.7	$ 41

Deposits - Summary of Deposits

Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Weighted Average Rate of Deposits, by Type [Abstract] [Abstract]
Weighted-average interest rate, savings	0.10%		0.05%
Weighted-average interest rate, transaction accounts	0.01%		0.01%
Weighted-average interest rate, insured money market accounts	0.32%		0.33%
Weighted-average interest rate, certificates of deposit and jumbo certificates	1.30%		1.27%
Deposits, by Type [Abstract]
Savings	$ 107,758		$ 103,243
Transaction accounts	261,001		272,484
Money market accounts	271,729		270,052
Certificates of deposit and jumbo certificates	240,134		239,253
Total Deposits	$ 880,622		$ 885,032
Weighted-average interest rate	0.47%		0.45%
Time Deposits, Fiscal Year Maturity [Abstract]
Within one year or less	$ 154,303		$ 139,613
After one year through two years	50,800		61,906
After two years through three years	19,997		20,732
After three years through four years	9,820		10,089
After four years through five years	5,187		6,886
After five years	27		27
Total time deposits	240,134		$ 239,253
Interest Expense, Deposits [Abstract]
Savings	16	$ 9
Transaction accounts	4	4
Insured money market accounts	215	212
Certificates of deposit and jumbo certificates	750	493
Interest expense	$ 985	$ 718

Federal Taxes on Income (Detail

Federal Taxes on Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowance	$ 1.2
Effective income tax rate	18.50%	16.50%

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Numerator:
Net income	$ 1,523	$ 2,164
Denominator
Basic weighted average common shares outstanding (in shares)	10,491,647	10,812,035
Dilutive restricted stock grants (in shares)	113,009	107,706
Diluted weighted average common shares outstanding (in shares)	10,604,656	10,919,741
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.20
Diluted earnings per share (in dollars per share)	$ 0.14	$ 0.20
Unallocated shares (in shares)	886,671	938,037	899,892
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0

Employee Benefits (Details)

Employee Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Minimum service period (over 12 month period)	1000 hours
Requisite service period	12 months
Debt structure, amortization period	20 years
Debt structure, estimated interest rate	2.46%
Principal and interest payments from ESOP	$ 0
Compensation expense	$ 220	$ 203
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated shares (in shares)	121,695		121,695
Committed to be released shares (in shares)	39,663		26,442
Unallocated shares (in shares)	886,671	938,037	899,892
Total ESOP shares (in shares)	1,048,029		1,048,029
Fair value of unallocated shares	$ 14,976		$ 14,668

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Nov. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0	0
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0
Vesting period	5 years
Total unrecognized compensation costs	$ 3,800
Remaining weighted-average vesting period	3 years 5 months 12 days
First Northwest Bancorp 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)			1,834,050
Number of shares available for grant (in shares)	1,408,450
Total compensation expense	$ 273	$ 217
First Northwest Bancorp 2015 Equity Incentive Plan | Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	98,414
Director | First Northwest Bancorp 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 85	$ 95

Stock-based Compensation - Summ

Stock-based Compensation - Summary of non-vested restricted stock awards (Details) - Restricted Stock Award - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Shares
Non-vested, beginning of period (in shares)	347,600	390,000
Granted (in shares)	0	0
Vested (in shares)	0	0
Forfeited (in shares)	0	0
Non-vested at end of period (in shares)	347,600	390,000
Weighted-Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 13.18	$ 12.70
Granted (in dollars per share)	0	0
Vested (in dollars per share)	0	0
Forfeited (in dollars per share)	0	0
Non-vested at end of period (in dollars per share)	$ 13.18	$ 12.70

Fair Value Accounting and Mea51

Fair Value Accounting and Measurement - Company Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 258,218	$ 290,242
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	258,218	290,242
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	258,218	290,242
Recurring | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	10,624	13,434
Recurring | ABS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	16,089	21,770
Recurring | ABS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	22,692	22,768
Recurring | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	10,040	19,908
Recurring | SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	40,349	47,274
Recurring | MBS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	140,172	144,542
Recurring | MBS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	18,252	20,546
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | ABS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | ABS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | MBS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | MBS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	258,218	290,242
Recurring | Significant Other Observable Inputs (Level 2) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	10,624	13,434
Recurring | Significant Other Observable Inputs (Level 2) | ABS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	16,089	21,770
Recurring | Significant Other Observable Inputs (Level 2) | ABS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	22,692	22,768
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	10,040	19,908
Recurring | Significant Other Observable Inputs (Level 2) | SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	40,349	47,274
Recurring | Significant Other Observable Inputs (Level 2) | MBS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	140,172	144,542
Recurring | Significant Other Observable Inputs (Level 2) | MBS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	18,252	20,546
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | ABS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | ABS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | MBS agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | MBS corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 0	$ 0

Fair Value Accounting and Mea52

Fair Value Accounting and Measurement - Schedule of Assets On A Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 13,345	$ 6,061
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	13,345	6,061
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 13,345	$ 6,061

Fair Value Accounting and Mea53

Fair Value Accounting and Measurement - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets
Investment securities available for sale	$ 258,218	$ 290,242
Investment securities held to maturity	47,267	50,266
Accrued interest receivable	3,641	3,745
Financial liabilities
Accrued interest payable	210	325
Level 1
Financial assets
Cash and cash equivalents	25,150	36,801
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale		0
Loans receivable, net	0	0
FHLB stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights, net	0	0
Financial liabilities
Borrowings	0	0
Accrued interest payable	0	0
Level 1 | Demand deposits
Financial liabilities
Deposits	640,488	645,779
Level 1 | Time deposits
Financial liabilities
Deposits	0	0
Level 2
Financial assets
Cash and cash equivalents	0	0
Investment securities available for sale	258,218	290,242
Investment securities held to maturity	47,267	50,266
Loans held for sale		788
Loans receivable, net	0	0
FHLB stock	6,389	7,023
Accrued interest receivable	3,641	3,745
Mortgage servicing rights, net	0	0
Financial liabilities
Borrowings	124,029	145,892
Accrued interest payable	210	325
Level 2 | Demand deposits
Financial liabilities
Deposits	0	0
Level 2 | Time deposits
Financial liabilities
Deposits	237,823	237,841
Level 3
Financial assets
Cash and cash equivalents	0	0
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale		0
Loans receivable, net	776,640	768,181
FHLB stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights, net	1,821	1,669
Financial liabilities
Borrowings	0	0
Accrued interest payable	0	0
Level 3 | Demand deposits
Financial liabilities
Deposits	0	0
Level 3 | Time deposits
Financial liabilities
Deposits	0	0
Carrying Value
Financial assets
Cash and cash equivalents	25,150	36,801
Investment securities available for sale	258,218	290,242
Investment securities held to maturity	47,709	50,126
Loans held for sale		788
Loans receivable, net	798,828	779,111
FHLB stock	6,389	7,023
Accrued interest receivable	3,641	3,745
Mortgage servicing rights, net	1,104	1,095
Financial liabilities
Borrowings	122,949	144,100
Accrued interest payable	210	325
Carrying Value | Demand deposits
Financial liabilities
Deposits	640,488	645,779
Carrying Value | Time deposits
Financial liabilities
Deposits	240,134	239,253
Fair Value
Financial assets
Cash and cash equivalents	25,150	36,801
Investment securities available for sale	258,218	290,242
Investment securities held to maturity	47,267	50,266
Loans held for sale		788
Loans receivable, net	776,640	768,181
FHLB stock	6,389	7,023
Accrued interest receivable	3,641	3,745
Mortgage servicing rights, net	1,821	1,669
Financial liabilities
Borrowings	124,029	145,892
Accrued interest payable	210	325
Fair Value | Demand deposits
Financial liabilities
Deposits	640,488	645,779
Fair Value | Time deposits
Financial liabilities
Deposits	$ 237,823	$ 237,841

Non-interest Income - Narrative

Non-interest Income - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Other income	$ 89	$ 81
Total non-interest income	1,482	2,201
Loan fees
Disaggregation of Revenue [Line Items]
Revenue not within scope of ASC 606	125	96
Deposit fees
Disaggregation of Revenue [Line Items]
Noninterest income within scope of ASC 606	392	400
Debit interchange income
Disaggregation of Revenue [Line Items]
Noninterest income within scope of ASC 606	32	37
Credit Card interchange income
Disaggregation of Revenue [Line Items]
Noninterest income within scope of ASC 606	406	357
Investment securities gain (loss), net
Disaggregation of Revenue [Line Items]
Revenue not within scope of ASC 606	122	0
Gain on loan sales, net
Disaggregation of Revenue [Line Items]
Revenue not within scope of ASC 606	167	284
Increase in cash surrender value of bank-owned life ins
Disaggregation of Revenue [Line Items]
Revenue not within scope of ASC 606	149	178
Income from bank-owned life insurance payout
Disaggregation of Revenue [Line Items]
Revenue not within scope of ASC 606	0	768
Revenue commission investment
Disaggregation of Revenue [Line Items]
Other income	74	87
Gain or loss on subsidiary
Disaggregation of Revenue [Line Items]
Other income	14	0
Remaining other income
Disaggregation of Revenue [Line Items]
Other income	$ 1	$ (6)