FS Bancorp (FSBW) 10-Q 10 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 03, 2019
Document And Entity Information
Entity Registrant Name	FS Bancorp, Inc.
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Entity Central Index Key	0001530249
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		4,492,542
Entity Small Business	false
Entity Emerging Growth Company	false

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 9,126	$ 9,408
Interest-bearing deposits at other financial institutions	53,948	23,371
Total cash and cash equivalents	63,074	32,779
Certificates of deposit at other financial institutions	22,073	22,074
Securities available-for-sale, at fair value	99,783	97,205
Loans held for sale, at fair value	45,591	51,195
Loans receivable, net	1,283,923	1,312,519
Accrued interest receivable	5,812	5,761
Premises and equipment, net	29,318	29,110
Operating lease right of use asset	4,849
Federal Home Loan Bank ("FHLB") stock, at cost	8,157	9,887
Other real estate owned ("OREO")	167	689
Bank owned life insurance ("BOLI"), net	34,700	34,485
Servicing rights, held at the lower of cost or fair value	10,611	10,429
Goodwill	2,312	2,312
Core deposit intangible, net	6,027	6,217
Other assets	9,719	6,982
TOTAL ASSETS	1,626,116	1,621,644
LIABILITIES
Noninterest-bearing accounts	245,585	234,532
Interest-bearing accounts	1,075,965	1,039,687
Total deposits	1,321,550	1,274,219
Borrowings	86,824	137,149
Principal amount	10,000	10,000
Unamortized debt issuance costs	(130)	(135)
Total subordinated note less unamortized debt issuance costs	9,870	9,865
Operating lease liabilities	4,976
Deferred tax liability, net	663	361
Other liabilities	16,281	20,012
Total liabilities	1,440,164	1,441,606
COMMITMENTS AND CONTINGENCIES (NOTE 7)
STOCKHOLDER'S EQUITY
Preferred stock, $.01 par value; 5,000,000 shares authorized; none issued or outstanding	0	0
Common stock, $.01 par value; 45,000,000 shares authorized; 4,489,042 and 4,492,478 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	45	45
Additional paid in capital	91,742	91,466
Retained Earnings (Accumulated Deficit)	95,383	90,854
Accumulated other comprehensive loss, net of tax	(436)	(1,479)
Unearned shares - Employee Stock Ownership Plan ("ESOP")	(782)	(848)
Total stockholders' equity	185,952	180,038
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,626,116	$ 1,621,644

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Items Included in Consolidated Statement of Financial Condition [Abstract]
Preferred stock par value, in dollars per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock par value, in dollars per share	$ 0.01	$ 0.01
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	4,489,042	4,492,478
Common stock, shares outstanding	4,489,042	4,492,478

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
INTEREST INCOME
Loans receivable, including fees	$ 21,109,000	$ 12,256,000
Interest and dividends on investment securities, cash and cash equivalents, and certificates of deposit at other financial institutions	1,202,000	732,000
Total interest and dividend income	22,311,000	12,988,000
INTEREST EXPENSE
Deposits	3,710,000	1,244,000
Borrowings	744,000	80,000
Subordinated note	168,000	167,000
Total interest expense	4,622,000	1,491,000
NET INTEREST INCOME	17,689,000	11,497,000
PROVISION FOR LOAN LOSSES	750,000	350,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	16,939,000	11,147,000
NONINTEREST INCOME
Service charges and fee income	1,658,000	659,000
Gain on sale of loans	2,397,000	3,978,000
Gain on sale of investment securities	0	113,000
Earnings on cash surrender value of BOLI	215,000	82,000
Other noninterest income	285,000	192,000
Total noninterest income	4,555,000	5,024,000
NONINTEREST EXPENSE
Salaries and benefits	8,243,000	7,048,000
Operations	2,044,000	1,359,000
Occupancy	1,112,000	648,000
Data processing	1,286,000	641,000
Gains losses on sales of investment real estate	85,000	0
OREO expenses	4,000	0
Loan costs	673,000	629,000
Professional and board fees	550,000	444,000
Federal Deposit Insurance Corporation ("FDIC") insurance	248,000	41,000
Marketing and advertising	135,000	149,000
Acquisition costs	374,000	0
Amortization of core deposit intangible	190,000	77,000
Impairment on servicing rights	23,000	0
Total noninterest expense	14,797,000	11,036,000
INCOME BEFORE PROVISION FOR INCOME TAXES	6,697,000	5,135,000
PROVISION FOR INCOME TAXES	1,505,000	813,000
NET INCOME	$ 5,192,000	$ 4,322,000
Basic earnings per share (in dollars per share)	$ 1.19	$ 1.22
Diluted earnings per share (in dollars per share)	$ 1.15	$ 1.15

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 5,192	$ 4,322
Securities available-for-sale:
Unrealized holding (loss) gain during period	1,328	(1,468)
Income tax benefit (provision) related to unrealized holding (loss) gain	(285)	316
Reclassification adjustment for realized gain included in net income	0	(113)
Income tax provision related to reclassification for realized gain	0	24
Other comprehensive income (loss), net of tax	1,043	(1,241)
COMPREHENSIVE INCOME	$ 6,235	$ 3,081

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Unearned ESOP Shares	Total
Beginning Balance at (in shares) at Dec. 31, 2017	3,680,152
Beginning balance at Dec. 31, 2017	$ 37	$ 55,135	$ 68,422	$ (475)	$ (1,117)	$ 122,002
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			4,322			4,322
Dividends paid ($0.11 and $0.15 per share for the period ended March 31, 2018 and 2019, respectively)			(395)			(395)
Share-based compensation		135				135
Stock options exercised		260				260
Stock options shares exercised (in shares)	15,400
Other comprehensive income (loss), net of tax				(1,241)		(1,241)
ESOP shares allocated		293			66	359
Ending Balance at (in shares) at Mar. 31, 2018	3,695,552
Ending balance at Mar. 31, 2018	$ 37	55,823	72,349	(1,716)	(1,051)	125,442
Beginning Balance at (in shares) at Dec. 31, 2018	4,492,478
Beginning balance at Dec. 31, 2018	$ 45	91,466	90,854	(1,479)	(848)	180,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			5,192			5,192
Dividends paid ($0.11 and $0.15 per share for the period ended March 31, 2018 and 2019, respectively)			(663)			(663)
Share-based compensation		262				262
Common stock repurchase		(285)				(285)
Common stock repurchased (in shares)	(6,036)
Stock options exercised		44				44
Stock options shares exercised (in shares)	2,600
Other comprehensive income (loss), net of tax				1,043		1,043
ESOP shares allocated		255			66	321
Ending Balance at (in shares) at Mar. 31, 2019	4,489,042
Ending balance at Mar. 31, 2019	$ 45	$ 91,742	$ 95,383	$ (436)	$ (782)	$ 185,952

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)	$ 0.15	$ 0.11

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Cash Flows [Abstract]
Net income	$ 5,192,000	$ 4,322,000
Adjustments to reconcile net income to net cash from operating activities
Provision for loan losses	750,000	350,000
Depreciation, amortization and accretion	2,321,000	1,139,000
Compensation expense related to stock options and restricted stock awards	262,000	135,000
ESOP compensation expense for allocated shares	321,000	359,000
Increase in cash surrender value of BOLI	(215,000)	(82,000)
Gain on sale of loans held for sale	(2,397,000)	(3,896,000)
Gain on sale of portfolio loans	0	(82,000)
Gain on sale of investment securities	0	(113,000)
Gain on sale of OREO	(85,000)	0
Origination of loans held for sale	(125,281,000)	(147,603,000)
Proceeds from sale of loans held for sale	132,461,000	152,419,000
Impairment on servicing rights	23,000	0
Changes in operating assets and liabilities
Accrued interest receivable	(51,000)	(107,000)
Other assets	(7,953,000)	845,000
Other liabilities	1,517,000	(912,000)
Net cash from operating activities	6,865,000	6,774,000
Activity in securities available-for-sale:
Proceeds from Sale of Debt Securities, Available-for-sale	0	5,305,000
Maturities, prepayments, sales, and calls	4,659,000	2,340,000
Purchases	(6,005,000)	(18,145,000)
Maturities of certificates of deposit at other financial institutions	0	496,000
Loan originations and principal collections, net	26,997,000	(32,911,000)
Purchase of portfolio loans	(321,000)	(17,000,000)
Proceeds from sale of portfolio loans	538,000	5,551,000
Proceeds from sale of other real estate owned, net	684,000	0
Purchase of premises and equipment, net	(860,000)	(749,000)
Purchase of BOLI	0	(3,000,000)
FHLB stock, net	1,730,000	(1,437,000)
Net cash used by investing activities	27,422,000	(59,550,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	47,331,000	27,636,000
Proceeds from borrowings	155,306,000	166,505,000
Repayments of borrowings	(205,725,000)	(134,505,000)
Dividends paid	(663,000)	(395,000)
Proceeds from stock options exercised	44,000	260,000
Common stock repurchased	(285,000)	0
Net cash from financing activities	(3,992,000)	59,501,000
NET DECREASE IN CASH AND CASH EQUIVALENTS	30,295,000	6,725,000
CASH AND CASH EQUIVALENTS, beginning of period	32,779,000	18,915,000
CASH AND CASH EQUIVALENTS, end of period	63,074,000	25,640,000
Cash paid during the year for:
Interest on deposits and borrowings	4,462,000	1,416,000
Income taxes	0	0
SUPPLEMENTARY DISCLOSURES OF NONCASH OPERATING, INVESTING AND FINANCING ACTIVITIES
Change in unrealized (loss) gain on investment securities, net	1,328,000	(1,581,000)
Property received in settlement of loans	92,000	0
Retention of gross mortgage servicing rights from loan sales	$ 844,000	$ 1,138,000

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	NOTE 1 - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations - FS Bancorp, Inc. (the “Company”) was incorporated in September 2011 as the holding company for 1st Security Bank of Washington (the “Bank” or “1st Security Bank”) in connection with the Bank’s conversion from the mutual to stock form of ownership which was completed on July 9, 2012. The Bank is a community-based savings bank with 21 full-service bank branches, an administrative office that accepts deposits, and eight home loan production offices in suburban communities in the greater Puget Sound area which includes Snohomish, King, Pierce, Jefferson, Kitsap, Clallam, Grays Harbor, Thurston, and Lewis counties, and one loan production office in the market area of the Tri-Cities, Washington. The Bank provides loan and deposit services to customers who are predominantly small- and middle-market businesses and individuals. The Company and its subsidiary are subject to regulation by certain federal and state agencies and undergo periodic examination by these regulatory agencies. On November 15, 2018, the Company completed its acquisition of Anchor Bancorp (“Anchor”), pursuant to the Agreement and Plan of Merger dated as of July 17, 2018 (the “Merger Agreement”) by and between FS Bancorp and Anchor. Under the terms of the Merger Agreement, Anchor merged with and into FS Bancorp (“Anchor Acquisition”), with FS Bancorp as the surviving corporation. Immediately after the Anchor Acquisition, FS Bancorp merged Anchor Bank, a wholly-owned subsidiary of Anchor, with and into 1st Security Bank of Washington, a wholly-owned subsidiary of FS Bancorp, with 1st Security Bank of Washington as the surviving bank. For additional information, see “Note 2 - Business Combination.” Financial Statement Presentation - The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and in accordance with the instructions to Form 10‑Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission (“SEC”). It is recommended that these unaudited interim consolidated financial statements be read in conjunction with the Company’s Annual Report on Form 10‑K with all of the audited information and footnotes required by U.S. GAAP for complete financial statements for the year ended December 31, 2018, as filed with the SEC on March 15, 2019. In the opinion of management, all normal adjustments and recurring accruals considered necessary for a fair presentation of the financial position and results of operations for the periods presented have been included. The results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019, or any other future period. The preparation of financial statements, in conformity with U.S. GAAP, requires management to make estimates and assumptions that affect amounts reported in the financial statements. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan and lease losses, fair value of financial instruments, the valuation of servicing rights, and the deferred income taxes. Amounts presented in the consolidated financial statements and footnote tables are rounded and presented to the nearest thousands of dollars except per share amounts. If the amounts are above $1.0 million, they are rounded one decimal point, and if they are above $1.0 billion, they are rounded two decimal points. Principles of Consolidation - The consolidated financial statements include the accounts of FS Bancorp, Inc. and its wholly owned subsidiary, 1st Security Bank of Washington. All material intercompany accounts have been eliminated in consolidation. Segment Reporting - The Company operates in two business segments through the Bank: commercial and consumer banking and home lending. The Company’s business segments are determined based on the products and services provided, as well as the nature of the related business activities, and they reflect the manner in which financial information is regularly reviewed for the purpose of allocating resources and evaluating performance of the Company’s businesses. The results for these business segments are based on management’s accounting process, which assigns income statement items and assets to each responsible operating segment. This process is dynamic and is based on management’s view of the Company’s operations. See “Note 16 - Business Segments.” Subsequent Events - The Company has evaluated events and transactions subsequent to March 31, 2019 for potential recognition or disclosure. RECENT ACCOUNTING PRONOUNCEMENTS In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016‑13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU requires the measurement of all current expected credit losses (“CECL”) for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of CECL. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. The ASU requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early application will be permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the impact of this ASU on the Company’s consolidated financial statements. Once adopted, we anticipate our allowance for loan losses to increase through a one‑time adjustment to retained earnings, however, until our evaluation is complete the magnitude of the increase will be unknown. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement . This ASU contains some technical adjustments related to the fair value disclosure requirements of public companies. Included in this ASU is the additional disclosure requirement of unrealized gains and losses for the period in recurring level 3 fair value disclosures and the range and weighted average of significant unobservable inputs, among other technical changes. ASU 2018-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for any removed or modified disclosures. The adoption of ASU 2018-13 is not expected to have a material impact on the Company's consolidated financial statements. In August 2018, FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . The amendments in this ASU broaden the scope of ASC Subtopic 350-40 to include costs incurred to implement a hosting arrangement that is a service contract. The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The costs are capitalized or expensed depending on the nature of the costs and the project stage during which they are incurred, consistent with the accounting for costs for internal-use software. The amendments in this ASU result in consistent capitalization of implementation costs of a hosting arrangement that is a service contract and implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this ASU. This ASU is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The amendments in this ASU should be applied either retrospectively to all implementation costs incurred after the date of adoption. Adoption of ASU 2018-15 is not expected to have a material impact on the Company’s Consolidated Financial Statements. Application of New Accounting Guidance Adopted in 2019 On January 1, 2019, the Company adopted FASB ASU No. 2016‑02, Leases (Topic 842) . ASU No. 2016‑02 requires lessees to recognize on the balance sheet the assets and liabilities arising from operating leases. A lessee should recognize a liability to make lease payments and an ROU asset representing its right to use the underlying asset for the lease term. A lessee should include payments to be made in an optional period only if the lessee is reasonably certain to exercise an option to extend the lease or not to exercise an option to terminate the lease. For operating leases, the lease cost should be allocated over the lease term on a generally straight-line basis. In July 2018, the FASB issued ASU No, 2018-10, Codification Improvements to Topic 842, Leases and ASU No. 2018-11, Leases (Topic 842): Targeted Improvements . These ASUs contain clarifications to ASU 2016-02, including providing a new transition method in addition to the existing transition method contained in ASU No. 2016-02 to allow entities to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. These amendments have the same effective date as ASU 2016-02. In March 2019, FASB issued ASU 2019-01, Leases (Topic 842), Codification Improvements . The amendment in this ASU that is applicable to the Company is Item 3 which clarifies interim disclosure requirements that allow omission of required transition disclosures. The effective date for this item is the same as ASU 2016-02. For financial reporting purposes, the Company applied the modified retrospective transition approach and elected to apply the transition option included in ASU 2018-11 on the effective date, January 1, 2019 which eliminates the requirement for reporting comparative periods presented in the financial statements prior to that date. The new standard provides for a number of practical expedients in transition. The Company elected the package of practical expedients, which permits us to not reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. The Company also elected the use-of-hindsight and elected the practical expedient to not separate lease and non-lease components on our real estate leases where we are the lessee. The Company did not elect the practical expedient pertaining to land easement as it is not applicable to us. The new standard also provides practical expedients for an entity's ongoing accounting. The Company has elected the short-term lease recognition exemption for certain leases which are less than 12 months in duration or month-to-month. This means, for those leases that qualify, ROU assets or lease liabilities will not be recognized. The adoption of this ASU created ROU assets of $4.8 million and operating lease liabilities of $5.0 million, and the related impact to the Company’s March 31, 2019 Consolidated Balance Sheet was approximately 0.3%. Additional disclosures required by the ASU have been included in “Note 7 - Leases.”

Business Combination

Business Combination	3 Months Ended
	Mar. 31, 2019
Business Combination [Abstract]
Business Combination Disclosure [Text Block]	NOTE 2 - BUSINESS COMBINATION On November 15, 2018, the Company completed its acquisition of Anchor Bancorp, pursuant to the Agreement and Plan of Merger dated as of July 17, 2018 by and between FS Bancorp and Anchor. Under the terms of the Merger Agreement, Anchor merged with and into FS Bancorp, with FS Bancorp as the surviving corporation. Immediately after the Anchor Acquisition, FS Bancorp merged Anchor Bank, a wholly-owned subsidiary of Anchor, with and into 1st Security Bank of Washington, a wholly-owned subsidiary of FS Bancorp, with 1st Security Bank of Washington as the surviving bank. Anchor’s principal business activities prior to the acquisition were attracting retail deposits from the general public and utilizing those deposits to originate loans including one-to-four-family residences, commercial real estate, and multi-family residences located in Western Washington. Anchor’s principal lending activity had consisted of the origination of loans secured by first mortgages on owner-occupied, one-to-four-family residences and loans for the construction of one-to-four-family residences, as well as consumer loans, with an emphasis on home equity loans and lines of credit. The primary objective for the acquisition was to significantly expand FS Bancorp’s presence throughout Western Washington, increase nonmaturity deposits, and offer additional banking and lending products to former Anchor customers as well as new customers. The Anchor Acquisition was accounted for under the acquisition method of accounting and accordingly, the assets and liabilities were recorded at their fair values on November 15, 2018, the date of acquisition. Determining the fair value of assets and liabilities is a complicated process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as information relative to the closing date fair values become available. The following table summarizes the estimated fair values of assets acquired and liabilities assumed at the date of acquisition: Acquired Book Fair Value Amount November 15, 2018 Value Adjustments Recorded Assets Cash and cash equivalents $ 54,558 $ — $ 54,558 Securities available-for-sale 19,609 (54) 19,555 Loans receivable, net 361,596 (5,321) (1) 356,275 Premises and equipment, net 8,411 3,354 (2) 11,765 Other real estate owned 689 — 689 Deferred tax asset 4,097 (3,358) 739 Mortgage servicing rights 218 564 782 Core deposit intangible ("CDI") — 5,251 (3) 5,251 Other assets 25,231 18 25,249 Total assets acquired $ 474,409 $ 454 $ 474,863 Liabilities Deposits $ 357,863 $ (1,052) (4) $ 356,811 Borrowings 37,000 (282) 36,718 Other liabilities 9,286 63 9,349 Total liabilities assumed $ 404,149 $ (1,271) $ 402,878 Explanation of Fair Value Adjustments (1) The fair value discount for acquired loans from Anchor was $5.3 million and was determined by separate adjustments to reflect a credit risk and marketability component and a yield component reflecting the differential between portfolio and market yields. The discount on acquired loans will be accreted back into interest income over an estimated average life of 60 months. (2) The fair value adjustment represents the difference between the fair value of the premises and the book value of those assets acquired. The Company utilized third-party valuations including appraisals, comparative market analysis, and tax-assessed values to assist in the determination of the fair value. (3) The fair value adjustment of $5.3 million represents the value of the core deposit base assumed on a study performed by an independent consulting firm. This amount was recorded by the Company as an identifiable intangible asset and will be amortized as an expense on a straight-line basis over an estimated 10 year life of the core deposit base and will be reviewed for impairment annually. See “Note 17 - Goodwill and Other Intangible Assets.” (4) The fair value of transaction and savings accounts was determined to be equal to their carrying values. The fair value of time deposits was calculated using a discounted cash flow analysis that calculated the present value of the projected cash flows from the portfolio versus the present value of a similar portfolio with a similar maturity profile at current market rates. As of the acquisition date, the portfolio of time deposits was valued at a pre-tax discount of $1.1 million, or 0.65% of core deposits. This adjustment represents a difference in interest rates from the time deposits acquired and the estimated wholesale funding rates used in the application of fair value accounting. The discounted amount will be accreted into expense as an increase in interest expense over the maturity profile of the acquired time deposits. The following table summarizes the consideration paid, the aggregate amount recognized for each major class of assets acquired and liabilities assumed by 1st Security Bank in the Anchor Acquisition: At November 15, 2018 Purchase price of Anchor Fair value of FS Bancorp common stock at $46.54 (1) per share for 725,518 shares $ Cash paid Total purchase price Fair value of assets acquired: Cash and cash equivalents $ 54,558 Securities available-for-sale 19,555 Loans receivable, net 356,275 Premises and equipment 11,765 OREO 689 Deferred tax asset 739 Mortgage servicing rights 782 Intangible assets – CDI 5,251 Other assets 25,249 Total assets and identifiable intangible assets acquired $ 474,863 Fair value of liabilities assumed: Deposits $ 356,811 Borrowings 36,718 Other liabilities 9,349 Total liabilities assumed $ 402,878 Fair value of net assets and identifiable intangible assets acquired Bargain purchase gain $ _______________________ (1) Stock price is as of the closing date. The application of the acquisition method of accounting resulted in a bargain purchase gain of $7.4 million for the year ended December 31, 2018 and was reported as a component of noninterest income on our Consolidated Statements of Income. The bargain purchase gain was primarily due to the decline in the value of the stock portion of the merger consideration between signing and closing the Anchor Acquisition which resulted in the purchase price for Anchor being less than the fair market value of the net assets acquired. In the merger, each Anchor shareholder received 0.291 of a share of FS Bancorp common stock for each share of Anchor common stock along with $12.40 in cash. The Company determined that the disclosure requirements related to the amounts of revenues and earnings of Anchor included in the consolidated statements of operations since the November 15, 2018 acquisition date was impracticable. The financial activity and operating results of Anchor were commingled with the Company’s financial activity and operating results as of the acquisition date.

Securities Available-for-sale

Securities Available-for-sale	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	NOTE 3 - SECURITIES AVAILABLE-FOR-SALE The following tables present the amortized costs, unrealized gains, unrealized losses, and estimated fair values of securities available-for-sale at March 31, 2019 and December 31, 2018: March 31, 2019 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 13,045 $ 42 $ (42) $ 13,045 Corporate securities 8,556 21 (37) 8,540 Municipal bonds 14,412 178 (116) 14,474 Mortgage-backed securities 49,632 123 (503) 49,252 U.S. Small Business Administration securities 14,694 — (222) 14,472 Total securities available-for-sale $ 100,339 $ 364 $ (920) $ 99,783 December 31, 2018 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 16,052 $ 32 $ (197) $ 15,887 Corporate securities 7,074 — (209) 6,865 Municipal bonds 14,446 23 (275) 14,194 Mortgage-backed securities 45,827 83 (1,074) 44,836 U.S. Small Business Administration securities 15,690 — (267) 15,423 Total securities available-for-sale $ 99,089 $ 138 $ (2,022) $ 97,205 At March 31, 2019, the Bank had pledged 11 securities held at the FHLB of Des Moines with a carrying value of $13.9 million to secure Washington State public deposits of $11.5 million with a $4.4 million collateral requirement by the Washington Public Deposit Protection Commission. At Decemb er 31, 2018, t he Bank pledged 11 securities held at the FHLB of Des Moines with a carrying value of $13.7 million to secure Washington State public deposits of $19.9 million with an $8.4 million minimum collateral requirement by the Washington Public Deposit Protection Commission. Investment securities that were in an unrealized loss position at March 31, 2019 and December 31, 2018 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position. Management believes that these securities are only temporarily impaired due to changes in market interest rates or the widening of market spreads subsequent to the initial purchase of the securities, and not due to concerns regarding the underlying credit of the issuers or the underlying collateral. March 31, 2019 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ — $ — $ 4,952 $ (42) $ 4,952 $ (42) Corporate securities 2,486 (6) 5,033 (31) 7,519 (37) Municipal bonds — — 5,082 (116) 5,082 (116) Mortgage-backed securities 2,305 (6) 28,913 (497) 31,218 (503) U.S. Small Business Administration securities — — 14,472 (222) 14,472 (222) Total $ 4,791 $ (12) $ 58,452 $ (908) $ 63,243 $ (920) December 31, 2018 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 6,018 $ (25) $ 4,822 $ (172) $ 10,840 $ (197) Corporate securities 975 (25) 5,890 (184) 6,865 (209) Municipal bonds 2,098 (22) 8,787 (253) 10,885 (275) Mortgage-backed securities 6,266 (40) 32,537 (1,034) 38,803 (1,074) U.S. Small Business Administration securities 1,958 (11) 13,465 (256) 15,423 (267) Total $ 17,315 $ (123) $ 65,501 $ (1,899) $ 82,816 $ (2,022) There were four investments with unrealized losses of less than one year, and 41 investments with unrealized losses of more than one year at March 31, 2019. There were 14 investments with unrealized losses of less than one year, and 48 investments with unrealized losses of more than one year at December 31, 2018. The unrealized losses associated with these investments are believed to be caused by changing market conditions that are considered to be temporary and the Company does not intend to sell the securities, and it is not likely to be required to sell these securities prior to maturity. Based on the Company’s evaluation of these securities, no other-than-temporary impairment was recorded for the three months ended March 31, 2019, or for the year ended December 31, 2018. The contractual maturities of securities available-for-sale at March 31, 2019 and December 31, 2018 are listed below. Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers may have the right to call or prepay the obligations; therefore, these securities are classified separately with no specific maturity date. March 31, 2019 December 31, 2018 Amortized Fair Amortized Fair Cost Value Cost Value U.S. agency securities Due after one year through five years $ 1,041 $ 1,048 $ 1,043 $ 1,040 Due after five years through ten years 7,006 7,011 10,011 9,941 Due after ten years 4,998 4,986 4,998 4,906 Subtotal 13,045 13,045 16,052 15,887 Corporate securities Due after one year through five years 7,064 7,048 6,077 5,947 Due after five years through ten years 1,492 1,492 997 918 Subtotal 8,556 8,540 7,074 6,865 Municipal bonds Due after one year through five years 2,659 2,619 2,659 2,570 Due after five years through ten years 2,599 2,661 2,610 2,592 Due after ten years 9,154 9,194 9,177 9,032 Subtotal 14,412 14,474 14,446 14,194 Mortgage-backed securities Federal National Mortgage Association (“FNMA”) 31,691 31,571 30,554 30,026 Federal Home Loan Mortgage Corporation (“FHLMC”) 10,008 9,812 10,301 9,961 Government National Mortgage Association (“GNMA”) 7,933 7,869 4,972 4,849 Subtotal 49,632 49,252 45,827 44,836 U.S. Small Business Administration securities Due after one year through five years 862 841 — — Due after five years through ten years 12,061 11,884 13,828 13,581 Due after ten years 1,771 1,747 1,862 1,842 Subtotal 14,694 14,472 15,690 15,423 Total $ 100,339 $ 99,783 $ 99,089 $ 97,205 There were no sales proceeds, gains, or losses for the three months ended March 31, 2019, compared to the proceeds and resulting gains and losses, computed using specific identification from sales of securities available-for-sale for the three months ended March 31, 2018 shown below: March 31, 2018 Gross Gross Proceeds Gains (Losses) Securities available-for-sale $ 5,305 $ 113 $ —

Loans Receivable and Allowance

Loans Receivable and Allowance For Loan Losses	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans Receivable and Allowance For Loan Losses	NOTE 4 - LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES The composition of the loan portfolio was as follows at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 2018 REAL ESTATE LOANS Commercial $ 208,607 $ 204,699 Construction and development 219,229 247,306 Home equity 40,714 40,258 One-to-four-family (excludes loans held for sale) 261,868 249,397 Multi-family 102,997 104,663 Total real estate loans 833,415 846,323 CONSUMER LOANS Indirect home improvement 174,792 167,793 Solar 44,494 44,433 Marine 59,884 57,822 Other consumer 5,246 5,425 Total consumer loans 284,416 275,473 COMMERCIAL BUSINESS LOANS Commercial and industrial 137,325 138,686 Warehouse lending 41,914 65,756 Total commercial business loans 179,239 204,442 Total loans receivable, gross 1,297,070 1,326,238 Allowance for loan losses (11,845) (12,349) Deferred costs and fees, net (2,710) (2,907) Premiums on purchased loans 1,408 1,537 Total loans receivable, net $ 1,283,923 $ 1,312,519 Most of the Company’s commercial and multi-family real estate, construction, residential, and/or commercial business lending activities are with customers located in Western Washington and near our one loan production office located in the Tri-Cities, Washington. The Company originates real estate, consumer, and commercial business loans and has concentrations in these areas, however, indirect home improvement loans and solar loans are originated through a network of home improvement contractors and dealers located throughout Washington, Oregon, California, Idaho, Colorado, and Arizona. Loans are generally secured by collateral and rights to collateral vary and are legally documented to the extent practicable. Local economic conditions may affect borrowers’ ability to meet the stated repayment terms. At March 31, 2019, the Bank held approximately $589.5 million in loans that qualify as collateral for FHLB advances and held approximately $274.8 million in loans that qualify as collateral for the Federal Reserve Bank line of credit. The Company has defined its loan portfolio into three segments that reflect the structure of the lending function, the Company’s strategic plan and the manner in which management monitors performance and credit quality. The three loan portfolio segments are: (a) Real Estate Loans, (b) Consumer Loans, and (c) Commercial Business Loans. Each of these segments is disaggregated into classes based on the risk characteristics of the borrower and/or the collateral type securing the loan. The following is a summary of each of the Company’s loan portfolio segments and classes: Real Estate Loans Commercial Lending . Loans originated by the Company primarily secured by income producing properties, including retail centers, warehouses, and office buildings located in our market areas. Construction and Development Lending . Loans originated by the Company for the construction of, and secured by, commercial real estate, one-to-four-family, and multi-family residences and tracts of land for development that are not pre-sold. A small portion of the one-to-four-family construction portfolio is custom construction loans to the intended occupant of the residence. Home Equity Lending . Loans originated by the Company secured by second mortgages on one-to-four-family residences, including home equity lines of credit in our market areas. One-to-Four-Family Real Estate Lending . One-to-four-family residential loans include owner occupied properties (including second homes), and non-owner occupied properties with four or less units. These loans originated by the Company are secured by first mortgages on one-to-four-family residences in our market areas that the Company intends to hold (excludes loans held for sale). Multi-Family Lending . Apartment term lending (five or more units) to current banking customers and community reinvestment loans for low to moderate income individuals in the Company’s footprint. Consumer Loans Indirect Home Improvement . Fixture secured loans for home improvement are originated by the Company through its network of home improvement contractors and dealers and are secured by the personal property installed in, on, or at the borrower’s real property, and may be perfected with a UCC‑2 financing statement filed in the county of the borrower’s residence. These indirect home improvement loans include replacement windows, siding, roofing, pools, and other home fixture installations. Solar. Fixture secured loans for solar related home improvement projects are originated by the Company through its network of contractors and dealers, and are secured by the personal property installed in, on, or at the borrower’s real property, and which may be perfected with a UCC‑2 financing statement filed in the county of the borrower’s residence. Marine . Loans originated by the Company, secured by boats, to borrowers primarily located in the states we originate consumer loans. Other Consumer. Loans originated by the Company to consumers in our retail branch footprint, including automobiles, recreational vehicles, direct home improvement loans, loans on deposits, and other consumer loans, primarily consisting of personal lines of credit and credit cards. Commercial Business Loans Commercial and Industrial Lending (“C&I”) . Loans originated by the Company to local small- and mid-sized businesses in our Puget Sound market area are secured primarily by accounts receivable, inventory, or personal property, plant and equipment. Some of the C&I loans purchased by the Company are outside of the Greater Puget Sound market area. C&I loans are made on the basis of the borrower’s ability to make repayment from the cash flow of the borrower’s business. Warehouse Lending . Loans originated to non-depository financial institutions and secured by notes originated by the non-depository financial institution. The Company has two distinct warehouse lending divisions: commercial warehouse re-lending secured by notes on construction loans and mortgage warehouse re-lending secured by notes on one-to-four-family loans. The Company’s commercial construction warehouse lines are secured by notes on construction loans and typically guaranteed by principals with experience in construction lending. Mortgage warehouse lending loans are funded through third-party residential mortgage bankers. Under this program the Company provides short-term funding to the mortgage banking companies for the purpose of originating residential mortgage loans for sale into the secondary market. The following tables detail activity in the allowance for loan losses by loan categories at or for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 5,761 $ 3,351 $ 3,191 $ 46 $ 12,349 Provision for loan losses 24 114 691 (79) 750 Charge-offs — (250) (1,152) — (1,402) Recoveries — 148 — — 148 Net charge-offs — (102) (1,152) — (1,254) Ending balance $ 5,785 $ 3,363 $ 2,730 $ (33) $ 11,845 Period end amount allocated to: Loans individually evaluated for impairment $ 173 $ 160 $ — $ — $ 333 Loans collectively evaluated for impairment 5,612 3,203 2,730 (33) 11,512 Ending balance $ 5,785 $ 3,363 $ 2,730 $ (33) $ 11,845 LOANS RECEIVABLE Loans individually evaluated for impairment $ 1,156 $ 457 $ 431 $ — $ 2,044 Loans collectively evaluated for impairment 832,259 283,959 178,808 — 1,295,026 Ending balance $ 833,415 $ 284,416 $ 179,239 $ — $ 1,297,070 At or For the Three Months Ended March 31, 2018 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 Provision for loan losses 14 84 295 (43) 350 Charge-offs (4) (228) — — (232) Recoveries — 264 2 — 266 Net (charge-offs) recoveries (4) 36 2 — 34 Ending balance $ 4,780 $ 2,934 $ 2,311 $ 1,115 $ 11,140 Period end amount allocated to: Loans individually evaluated for impairment $ 41 $ 87 $ — $ — $ 128 Loans collectively evaluated for impairment 4,739 2,847 2,311 1,115 11,012 Ending balance $ 4,780 $ 2,934 $ 2,311 $ 1,115 $ 11,140 LOANS RECEIVABLE Loans individually evaluated for impairment $ 472 $ 248 $ — $ — $ 720 Loans collectively evaluated for impairment 446,119 218,681 152,175 — 816,975 Ending balance $ 446,591 $ 218,929 $ 152,175 $ — $ 817,695 Non-accrual and 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. Loans are automatically placed on non-accrual once the loan is 90 days past due or sooner if, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, or as required by regulatory authorities. The following tables provide information pertaining to the aging analysis of contractually past due loans and non-accrual loans at March 31, 2019 and December 31, 2018: March 31, 2019 30-59 60-89 Days Days 90 Days Total Total Past Past or More Past Loans Non- Due Due Past Due Due Current Receivable Accrual REAL ESTATE LOANS Commercial $ — $ — $ — $ — $ 208,607 $ 208,607 $ — Construction and development — — — — 219,229 219,229 — Home equity 5 — 186 191 40,523 40,714 191 One-to-four-family 1,466 — 1,512 2,978 258,890 261,868 1,902 Multi-family — — — — 102,997 102,997 — Total real estate loans 1,471 — 1,698 3,169 830,246 833,415 2,093 CONSUMER LOANS Indirect home improvement 244 152 95 491 174,301 174,792 381 Solar — 58 16 74 44,420 44,494 59 Marine — — — — 59,884 59,884 5 Other consumer 28 16 16 60 5,186 5,246 12 Total consumer loans 272 226 127 625 283,791 284,416 457 COMMERCIAL BUSINESS LOANS Commercial and industrial 80 — 431 511 136,814 137,325 431 Warehouse lending — — — — 41,914 41,914 — Total commercial business loans 80 — 431 511 178,728 179,239 431 Total loans $ 1,823 $ 226 $ 2,256 $ 4,305 $ 1,292,765 $ 1,297,070 $ 2,981 December 31, 2018 30-59 60-89 Days Days 90 Days Total Total Past Past or More Past Loans Non- Due Due Past Due Due Current Receivable Accrual REAL ESTATE LOANS Commercial $ — $ — $ — $ — $ 204,699 $ 204,699 $ — Construction and development — — — — 247,306 247,306 — Home equity 158 40 229 427 39,831 40,258 229 One-to-four-family 1,274 164 1,358 2,796 246,601 249,397 1,552 Multi-family — — — — 104,663 104,663 — Total real estate loans 1,432 204 1,587 3,223 843,100 846,323 1,781 CONSUMER LOANS Indirect home improvement 438 196 113 747 167,046 167,793 367 Solar 62 43 41 146 44,287 44,433 41 Marine 50 — — 50 57,772 57,822 18 Other consumer 69 24 11 104 5,321 5,425 2 Total consumer loans 619 263 165 1,047 274,426 275,473 428 COMMERCIAL BUSINESS LOANS Commercial and industrial — 431 — 431 138,255 138,686 1,685 Warehouse lending — — — — 65,756 65,756 — Total commercial business loans — 431 — 431 204,011 204,442 1,685 Total loans $ 2,051 $ 898 $ 1,752 $ 4,701 $ 1,321,537 $ 1,326,238 $ 3,894 There was one other consumer loan and two other consumer loans 90 days or more past due and still accruing interest of $5,000 and $11,000 at March 31, 2019 and at December 31, 2018, respectively. The following tables provide additional information about our impaired loans that have been segregated to reflect loans for which an allowance for loan losses has been provided and loans for which no allowance was provided at March 31, 2019 and December 31, 2018: March 31, 2019 Unpaid Principal Recorded Related Balance Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 191 $ 191 $ — One-to-four-family 746 746 — Total real estate loans 937 937 — Commercial business loans 431 431 — 1,368 1,368 — WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,156 1,156 173 Consumer loans 457 457 160 1,613 1,613 333 Total $ 2,981 $ 2,981 $ 333 December 31, 2018 Unpaid Principal Recorded Related Balance Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 229 $ 229 $ — WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,552 1,552 125 Consumer loans 428 428 150 Commercial business loans 1,685 1,685 700 3,665 3,665 975 Total $ 3,894 $ 3,894 $ 975 The following table presents the average recorded investment in loans individually evaluated for impairment and the interest income recognized and received for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 March 31, 2018 Average Recorded Interest Income Average Recorded Interest Income Investment Recognized Investment Recognized WITH NO RELATED ALLOWANCE RECORDED Home equity $ 267 $ — $ 203 $ 2 One-to-four-family 830 15 — — Total real estate loans 1,097 15 203 2 Commercial business loans 431 — — — 1,528 15 203 2 WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,156 — 271 2 Consumer loans 459 9 259 6 Commercial business loans 1,152 7 — — 2,767 16 530 8 Total $ 4,295 $ 31 $ 733 $ 10 Credit Quality Indicators As part of the Company’s on-going monitoring of credit quality of the loan portfolio, management tracks certain credit quality indicators including trends related to (i) the risk grading of loans, (ii) the level of classified loans, (iii) net charge-offs, (iv) non-performing loans, and (v) the general economic conditions in the Company’s markets. The Company utilizes a risk grading matrix to assign a risk grade to its real estate and commercial business loans. Loans are graded on a scale of 1 to 10, with loans in risk grades 1 to 6 considered “Pass” and loans in risk grades 7 to 10 are reported as classified loans in the Company’s allowance for loan loss analysis. A description of the 10 risk grades is as follows:  Grades 1 and 2 - These grades include loans to very high quality borrowers with excellent or desirable business credit.  Grade 3 - This grade includes loans to borrowers of good business credit with moderate risk.  Grades 4 and 5 - These grades include “Pass” grade loans to borrowers of average credit quality and risk.  Grade 6 - This grade includes loans on management’s “Watch” list and is intended to be utilized on a temporary basis for “Pass” grade borrowers where frequent and thorough monitoring is required due to credit weaknesses and where significant risk-modifying action is anticipated in the near term.  Grade 7 - This grade is for “Other Assets Especially Mentioned” (“OAEM”) in accordance with regulatory guidelines and includes borrowers where performance is poor or significantly less than expected.  Grade 8 - This grade includes “Substandard” loans in accordance with regulatory guidelines which represent an unacceptable business credit where a loss is possible if loan weakness is not corrected.  Grade 9 - This grade includes “Doubtful” loans in accordance with regulatory guidelines where a loss is highly probable.  Grade 10 - This grade includes “Loss” loans in accordance with regulatory guidelines for which total loss is expected and when identified are charged off. Consumer, Home Equity, and One-to-Four-Family Real Estate Loans Homogeneous loans are risk rated based upon the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy. Loans classified under this policy at the Company are consumer loans which include indirect home improvement, solar, marine, other consumer, and one-to-four-family first and second liens. Under the Uniform Retail Credit Classification Policy, loans that are current or less than 90 days past due are graded “Pass” and risk rated “4” or “5” internally. Loans that are past due more than 90 days are classified “Substandard” and risk rated “8” internally until the loan has demonstrated consistent performance, typically six months of contractual payments. Closed-end loans that are 120 days past due and open-end loans that are 180 days past due are charged off based on the value of the collateral less cost to sell. The following tables summarize risk rated loan balances by category at the dates indicated: March 31, 2019 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 206,655 $ 1,952 $ — $ — $ — $ — $ 208,607 Construction and development 213,708 5,521 — — — — 219,229 Home equity 40,485 — 38 191 — — 40,714 One-to-four-family 259,697 206 63 1,902 — — 261,868 Multi-family 101,774 1,223 — — — — 102,997 Total real estate loans 822,319 8,902 101 2,093 — — 833,415 CONSUMER LOANS Indirect home improvement 174,411 — — 381 — — 174,792 Solar 44,435 — — 59 — — 44,494 Marine 59,879 — — 5 — — 59,884 Other consumer 5,227 — 7 12 — — 5,246 Total consumer loans 283,952 — 7 457 — — 284,416 COMMERCIAL BUSINESS LOANS Commercial and industrial 124,066 8,658 20 4,581 — — 137,325 Warehouse lending 41,914 — — — — — 41,914 Total commercial business loans 165,980 8,658 20 4,581 — — 179,239 Total loans receivable, gross $ 1,272,251 $ 17,560 $ 128 $ 7,131 $ — $ — $ 1,297,070 December 31, 2018 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 203,557 $ 1,142 $ — $ — $ — $ — $ 204,699 Construction and development 244,577 2,729 — — — — 247,306 Home equity 39,846 — 183 229 — — 40,258 One-to-four-family 247,575 207 63 1,552 — — 249,397 Multi-family 103,447 1,216 — — — — 104,663 Total real estate loans 839,002 5,294 246 1,781 — — 846,323 CONSUMER LOANS Indirect home improvement 167,426 — — 367 — — 167,793 Solar 44,392 — — 41 — — 44,433 Marine 57,804 — — 18 — — 57,822 Other consumer 5,415 — 8 2 — — 5,425 Total consumer loans 275,037 — 8 428 — — 275,473 COMMERCIAL BUSINESS LOANS Commercial and industrial 124,089 8,813 — 5,784 — — 138,686 Warehouse lending 65,756 — — — — — 65,756 Total commercial business loans 189,845 8,813 — 5,784 — — 204,442 Total loans receivable, gross $ 1,303,884 $ 14,107 $ 254 $ 7,993 $ — $ — $ 1,326,238

Servicing Rights

Servicing Rights	3 Months Ended
	Mar. 31, 2019
Fair Value, Off-balance Sheet Risk [Abstract]
Servicing Rights	NOTE 5 - SERVICING RIGHTS Loans serviced for others are not included on the Consolidated Balance Sheets. The unpaid principal balances of permanent loans serviced for others were $1.24 billion and $1.19 billion at March 31, 2019 and December 31, 2018, respectively, and are carried at the lower of cost or market. The following table summarizes servicing rights activity for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 2018 Beginning balance $ 10,429 $ 6,795 Additions 844 1,138 Servicing rights amortized (639) (418) Impairment on servicing rights (23) — Ending balance $ 10,611 $ 7,515 The fair market value of the servicing rights’ assets was $12.9 million and $14.6 million at March 31, 2019 and December 31, 2018, respectively. Fair value adjustments to servicing rights are mainly due to market-based assumptions associated with discounted cash flows, loan prepayment speeds, and changes in interest rates. A significant change in prepayments of the loans in the servicing portfolio could result in significant changes in the valuation adjustments, thus creating potential volatility in the carrying amount of servicing rights. The following provides valuation assumptions used in determining the fair value of mortgage servicing rights (“MSR”) at the dates indicated: At March 31, At December 31, 2019 2018 Key assumptions: Weighted average discount rate 9.5 % 9.5 % Conditional prepayment rate (“CPR”) 13.5 % 9.4 % Weighted average life in years 6.1 7.7 Key economic assumptions and the sensitivity of the current fair value for single family MSR to immediate adverse changes in those assumptions at March 31, 2019 and December 31, 2018 were as follows: March 31, 2019 December 31, 2018 Aggregate portfolio principal balance $ 1,235,058 $ 1,186,858 Weighted average rate of note 4.3 % % At March 31, 2019 Base 0.5% Adverse Rate Change 1.0% Adverse Rate Change Conditional prepayment rate 13.5 % 18.8 % 26.2 % Fair value MSR $ 12,914 $ 10,916 $ 8,957 Percentage of MSR 1.0 % 0.9 % 0.7 % Discount rate 9.7 % 10.2 % 10.7 % Fair value MSR $ 12,914 $ 12,676 $ 12,446 Percentage of MSR 1.0 % 1.0 % 1.0 % At December 31, 2018 Base 0.5% Adverse Rate Change 1.0% Adverse Rate Change Conditional prepayment rate 8.8 % 11.6 % 17.7 % Fair value MSR $ 14,218 $ 12,723 $ 10,358 Percentage of MSR 1.2 % 1.1 % 0.9 % Discount rate 9.6 % 10.1 % 10.6 % Fair value MSR $ 14,218 $ 13,912 $ 13,617 Percentage of MSR 1.2 % 1.2 % 1.2 % The above table shows the sensitivity to market rate changes for the par rate coupon for a conventional one-to-four-family FNMA, FHLMC, GNMA, or FHLB serviced home loan. The above tables reference a 50 basis point and 100 basis point decrease in note rates. These sensitivities are hypothetical and should be used with caution as the tables above demonstrate the Company’s methodology for estimating the fair value of MSR which is highly sensitive to changes in key assumptions. For example, actual prepayment experience may differ and any difference may have a material effect on MSR fair value. Changes in fair value resulting from changes in assumptions generally cannot be extrapolated because the relationship of the change in the assumption to the change in fair value may not be linear. Also, in these tables, the effects of a variation in a particular assumption on the fair value of the MSR is calculated without changing any other assumption; in reality, changes in one factor may be associated with changes in another (for example, decreases in market interest rates may provide an incentive to refinance, however, this may also indicate a slowing economy and an increase in the unemployment rate, which reduces the number of borrowers who qualify for refinancing), which may magnify or counteract the sensitivities. Thus, any measurement of MSR fair value is limited by the conditions existing and assumptions made at a particular point in time. Those assumptions may not be appropriate if they are applied to a different point in time. The Company recorded $802,000 and $536,000 of gross contractually specified servicing fees, late fees, and other ancillary fees resulting from servicing of mortgage and commercial loans for the three months ended March 31, 2019 and 2018, respectively. The income, net of amortization, is reported in noninterest income on the Consolidated Statements of Income.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	NOTE 6 - DERIVATIVES The Company regularly enters into commitments to originate and sell loans held for sale. The Company has established a hedging strategy to protect itself against the risk of loss associated with interest rate movements on loan commitments. The Company enters into contracts to sell forward To-Be-Announced (“TBA”) mortgage-backed securities. These commitments and contracts are considered derivatives but have not been designated as hedging instruments for reporting purposes under U.S. GAAP. Rather, they are accounted for as free-standing derivatives, or economic hedges, with changes in the fair value of the derivatives reported in noninterest income. The Company recognizes all derivative instruments as either other assets or other liabilities on the Consolidated Balance Sheets and measures those instruments at fair value. The following tables summarize the Company’s derivative instruments at the dates indicated: March 31, 2019 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 41,486 $ 686 $ — Mandatory and best effort forward commitments with investors 17,530 — 96 Forward TBA mortgage-backed securities 64,500 — 301 TBA mortgage-backed securities forward sales paired off with investors 23,500 — 160 December 31, 2018 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 29,432 $ 503 $ — Mandatory and best effort forward commitments with investors 24,776 — 34 Forward TBA mortgage-backed securities 51,500 — 540 TBA mortgage-backed securities forward sales paired off with investors 6,500 — 64 At March 31, 2019 and December 31, 2018, the Company had $64.5 million and $51.5 million of TBA trades with counterparties that required margin collateral of $460,000 for both periods. This collateral is included in interest-bearing deposits at other financial institutions on the Consolidated Balance Sheets. Changes in the fair value of the derivatives recognized in other noninterest income on the Consolidated Statements of Income and included in gain on sale of loans resulted in net gains of $ 299,000 and $81,000 for the three months ended March 31, 2019 and 2018, respectively.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
LEASES
LEASES	NOTE 7 - LEASES The Company has operating leases for retail bank and home lending branches, and certain equipment. The ROU assets obtained in exchange for operating lease obligations totaled $5.2 million at January 1, 2019. Our leases have remaining lease terms of three months to eight years, some of which include options to extend the leases for up to five years. The components of lease cost (included in occupancy expense) are as follows for the three months ended March 31, 2019: Three Months Ended March 31, 2019 Lease cost: Operating lease cost $ 308 Short-term lease cost 46 Total lease cost $ 354 The following table provides supplemental information related to operating leases: Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 334 Weighted average remaining lease term- operating leases 5.8 years Weighted average discount rate- operating leases 3.08 % The Company’s leases typically do not contain a discount rate implicit in the lease contract. As an alternative, the weighted average discount rate used to present value the future value of lease payments due in calculating the value of the ROU asset and lease liability was determined by utilizing the December 31, 2018 fixed-rate advances issued by the FHLB of Des Moines, for all leases entered into prior to the January 1, 2019 adoption date. Since adopting the new standard, the Company has not entered into any new leases. Maturities of operating lease liabilities at March 31, 2019 for future periods are as follows: Remainder of 2019 $ 972 2020 1,082 2021 947 2022 841 2023 482 Thereafter 1,282 Total lease payments $ 5,606 Less imputed interest (630) Total $ 4,976

Other Real Estate Owned

Other Real Estate Owned	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Other Real Estate Owned	NOTE 8 - OTHER REAL ESTATE OWNED (“OREO”) The following table presents the activity related to OREO at and for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 2018 Beginning balance $ 689 $ — Additions 77 — Gross proceeds from sale of OREO (684) — Gain on sale of OREO 85 — Ending balance $ 167 $ — At March 31, 2019, there were $167,000 in OREO properties and associated holding costs of $4,000, compared to no OREO properties at March 31, 2018. There were $442,000 in mortgage loans collateralized by residential real estate property in the process of foreclosure at March 31, 2019.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Deposits	NOTE 9 - DEPOSITS Deposits are summarized as follows at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 (1)(2) 2018 (1)(2) Noninterest-bearing checking $ 228,067 $ 221,107 Interest-bearing checking 181,402 151,103 Savings 122,940 122,344 Money market 270,718 282,595 Certificates of deposit less than $100,000 (3) 261,664 243,193 Certificates of deposit of $100,000 through $250,000 160,899 154,095 Certificates of deposit of $250,000 and over (4) 78,342 86,357 Escrow accounts related to mortgages serviced 17,518 13,425 Total $ 1,321,550 $ 1,274,219 __________________________ (1) Includes $120.7 million of deposits at March 31, 2019 from the purchase of four retail bank branches from Bank of America, National Association on January 22, 2016 (“Branch Purchase”) and $120.0 million at December 31, 2018. (2) Includes $343.6 million and $321.1 million of deposits at March 31, 2019 and December 31, 2018, respectively, from the Anchor Acquisition. (3) Includes $129.7 million and $116.7 million of brokered deposits at March 31, 2019 and December 31, 2018, respectively. (4) Time deposits that meet or exceed the FDIC insurance limit. Federal Reserve regulations require that the Bank maintain reserves in the form of cash on hand and deposit balances with the Federal Reserve Bank based on a percentage of deposits. The amounts of such balances at March 31, 2019 and December 31, 2018 were $24.5 million and $17.4 million, respectively, included in interest-bearing deposits at other financial institutions on the Consolidated Balance Sheets. Scheduled maturities of time deposits at March 31, 2019 for future periods ending are as follows: At March 31, 2019 Maturing in 2019 $ 249,727 Maturing in 2020 162,185 Maturing in 2021 48,513 Maturing in 2022 29,270 Maturing in 2023 9,441 Thereafter 1,769 Total $ 500,905 Interest expense by deposit category for the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended March 31, 2019 2018 Interest-bearing checking $ 196 $ 67 Savings and money market 763 319 Certificates of deposit 2,751 858 Total $ 3,710 $ 1,244

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 10 - COMMITMENTS AND CONTINGENCIES Commitments - The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized on the Consolidated Balance Sheets. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The following table provides a summary of the Company’s commitments at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 2018 COMMITMENTS TO EXTEND CREDIT REAL ESTATE LOANS Commercial $ 4,476 $ 5,836 Construction and development 62,129 76,889 One-to-four-family (includes locks for salable loans) 43,666 35,714 Home equity 40,801 41,204 Multi-family 507 515 Total real estate loans 151,579 160,158 CONSUMER LOANS 23,451 18,560 COMMERCIAL BUSINESS LOANS Commercial and industrial 75,869 72,880 Warehouse lending 50,086 44,243 Total commercial business loans 125,955 117,123 Total commitments to extend credit $ 300,985 $ 295,841 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Since many of the commitments are expected to expire without being drawn upon, the amount of the total commitments do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon an extension of credit, is based on management’s credit evaluation of the party. Collateral held varies, but may include accounts receivable, inventory, property and equipment, residential real estate, and income-producing commercial properties. Unfunded commitments under commercial lines of credit, revolving credit lines, and overdraft protection agreements are commitments for possible future extensions of credit to existing customers. These lines of credit are uncollateralized and usually do not contain a specified maturity date and ultimately may not be drawn upon to the total extent to which the Company is committed. The Company has established reserves for estimated losses from unfunded commitments of $285,000 at March 31, 2019 and $299,000 at December 31, 2018. One-to-four-family commitments included in the table above are accounted for as fair value derivatives and do not carry an associated loss reserve. The Company also sells one-to-four-family loans to the FHLB of Des Moines that require a limited level of recourse if the loans default and exceed a certain loss exposure. Specific to that recourse, the FHLB of Des Moines established a first loss account (“FLA”) related to the loans and required a credit enhancement (“CE”) obligation by the Bank to be utilized after the FLA is used. Based on loans sold through March 31, 2019, the total loans sold to the FHLB were $68.2 million with the FLA totaling $776,000 and the CE obligation at $524,000 or 0.77% of the loans outstanding. Management has established a holdback of 10% of the outstanding CE, or $227,000, which is a part of the off-balance sheet holdback for loans sold. There were no outstanding delinquencies on the loans sold to the FHLB of Des Moines at both March 31, 2019 and December 31, 2018. Contingent liabilities for loans held for sale - In the ordinary course of business, loans are sold with limited recourse against the Company and may have to subsequently be repurchased due to defects that occurred during the origination of the loan. The defects are categorized as documentation errors, underwriting errors, early payoff, early payment defaults, breach of representation or warranty, servicing errors, and/or fraud. When a loan sold to an investor without recourse fails to perform according to its contractual terms, the investor will typically review the loan file to determine whether defects in the origination process occurred. If a defect is identified, the Company may be required to either repurchase the loan or indemnify the investor for losses sustained. If there are no such defects, the Company has no commitment to repurchase the loan. The Company has recorded a holdback reserve of $1.0 million to cover loss exposure related to these guarantees for one-to-four-family loans sold into the secondary market at both March 31, 2019 and December 31, 2018, which is included in other liabilities on the Consolidated Balance Sheets. The Company has entered into a severance agreement with its Chief Executive Officer. The severance agreement, subject to certain requirements, generally includes a lump sum payment to the Chief Executive Officer equal to 24 months of base compensation in the event his employment is involuntarily terminated, other than for cause or the executive terminates his employment with good reason, as defined in the severance agreement. The Company has entered into change of control agreements with its Chief Financial Officer/Chief Operating Officer, Chief Lending Officer, Chief Credit Officer, Chief Risk Officer, Chief Human Resources Officer, Senior Vice President Compliance Officer, Executive Vice President of Retail Banking and Marketing, and two Executive Vice Presidents of Home Lending. The change of control agreements, subject to certain requirements, generally remain in effect until canceled by either party upon at least 24 months prior written notice. Under the change of control agreements, the executive generally will be entitled to a change of control payment from the Company if the executive is involuntarily terminated within six months preceding or 12 months after a change in control (as defined in the change of control agreements). In such an event, the executives would each be entitled to receive a cash payment in an amount equal to 12 months of their then current salary, subject to certain requirements in the change of control agreements. The Bank received 7,158 shares of Class B common stock in Visa, Inc. as a result of the Visa initial public offering (“IPO”) in March 2008. These Class B shares of stock held by the Bank could be converted to Class A shares at a conversion rate of 1.6298 when all litigation pending as of the date of the IPO is concluded. The conversion rate was reduced in 2018 as Visa made an additional deposit to their litigation escrow account thus reducing the number of as-converted Class B shares and corresponding conversion rate. At March 31, 2019, the date that litigation will be concluded cannot be determined. Until such time, the stock cannot be redeemed or sold by the Bank; therefore, it is not readily marketable and has a current carrying value of $0. Visa, Inc. Class A stock’s market value at March 31, 2019 and December 31, 2018 was $156.19 per share and $131.94 per share, respectively. As a result of the nature of our activities, the Company is subject to various pending and threatened legal actions, which arise in the ordinary course of business. From time to time, subordination liens may create litigation which requires us to defend our lien rights. In the opinion of management, liabilities arising from these claims, if any, will not have a material effect on our financial position. The Company had no material pending legal actions at March 31, 2019.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	NOTE 11 - FAIR VALUE MEASUREMENTS The Company determines the fair values of its financial instruments based on the requirements established in Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements, which provides a framework for measuring fair value in accordance with U.S. GAAP and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 defines fair values for financial instruments as the exit price, the price that would be received for an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date under current market conditions. ASU 2016-01 , Financial Instruments - Overall (Subtopic 825‑10), Recognition and Measurement of Financial Assets and Financial Liabilities, requires us to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The following definitions describe the levels of inputs that may be used to measure fair value: Level 1 - Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 - Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3 - Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The following methods were used to estimate the fair value of financial instruments on a recurring and nonrecurring basis: Securities Available-for-Sale - The fair value of securities available-for-sale are recorded on a recurring basis. The fair value of investments and mortgage-backed securities are provided by a third-party pricing service. These valuations are based on market data using pricing models that vary by asset class and incorporate available current trade, bid, and other market information, and for structured securities, cash flow, and loan performance data. The pricing processes utilize benchmark curves, benchmarking of similar securities, sector groupings, and matrix pricing. Option adjusted spread models are also used to assess the impact of changes in interest rates and to develop prepayment scenarios. Transfers between the fair value hierarchy are determined through the third-party service provider which, from time to time will transfer between levels based on market conditions per the related security. All models and processes used take into account market convention (Level 2). Mortgage Loans Held for Sale - The fair value of loans held for sale reflects the value of commitments with investors and/or the relative price as delivered into a TBA mortgage-backed security (Level 2). Derivative Instruments - The fair value of the interest rate lock commitments and forward sales commitments are estimated using quoted or published market prices for similar instruments, adjusted for factors such as pull-through rate assumptions based on historical information, where appropriate. TBA mortgage-backed securities are fair valued on similar contracts in active markets (Level 2) while locks and forwards with customers and investors are fair valued using similar contracts in the market and changes in the market interest rates (Level 2 and 3). Impaired Loans - Fair value adjustments to impaired collateral dependent loans are recorded to reflect partial write-downs based on the current appraised value of the collateral or internally developed models, which contain management’s assumptions. Management will utilize discounted cashflow impairment for TDRs when the change in terms results in a discount to the overall cashflows to be received (Level 3). Other Real Estate Owned - Fair value adjustments to OREO are recorded at the lower of carrying amount of the loan or fair value less selling costs. Any write-downs based on the asset’s fair value at the date of acquisition are charged to the allowance for loan losses. After foreclosure, management periodically performs valuations such that the real estate is carried at the lower of its new cost basis or fair value, net of estimated costs to sell (Level 3). Servicing Rights - The fair value of mortgage servicing rights are estimated using net present value of expected cash flows using a third party model that incorporates assumptions used in the industry to value such rights, adjusted for factors such as weighted average prepayments speeds based on historical information where appropriate (Level 3). The following tables present securities available-for-sale measured at fair value on a recurring basis at the dates indicated: Securities Available-for-Sale Level 1 Level 2 Level 3 Total At March 31, 2019 U.S. agency securities $ — $ 13,045 $ — $ 13,045 Corporate securities — 8,540 — 8,540 Municipal bonds — 14,474 — 14,474 Mortgage-backed securities — 49,252 — 49,252 U.S. Small Business Administration securities — 14,472 — 14,472 Total $ — $ 99,783 $ — $ 99,783 Securities Available-for-Sale Level 1 Level 2 Level 3 Total At December 31, 2018 U.S. agency securities $ — $ 15,887 $ — $ 15,887 Corporate securities — 6,865 — 6,865 Municipal bonds — 14,194 — 14,194 Mortgage-backed securities — 44,836 — 44,836 U.S. Small Business Administration securities — 15,423 — 15,423 Total $ — $ 97,205 $ — $ 97,205 The following table presents mortgage loans held for sale measured at fair value on a recurring basis at the dates indicated: Mortgage Loans Held for Sale Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ 45,591 $ — $ 45,591 December 31, 2018 $ — $ 51,195 $ — $ 51,195 The following tables present the fair value of interest rate lock commitments with customers, individual forward sale commitments with investors, and paired off commitments with investors measured at their fair value on a recurring basis at the dates indicated: Interest Rate Lock Commitments with Customers Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 686 $ 686 December 31, 2018 $ — $ — $ 503 $ 503 Individual Forward Sale Commitments with Investors Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ (301) (96) $ (397) December 31, 2018 $ — $ (540) $ (34) $ (574) Paired Off Commitments with Investors Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ (160) $ — $ (160) December 31, 2018 $ — $ (64) $ — $ (64) The following tables present impaired loans, OREO and servicing rights measured at fair value on a nonrecurring basis for which a nonrecurring change in fair value has been recorded during the reporting periods indicated. The amounts disclosed below represent the fair values at the time the nonrecurring fair value measurements were evaluated. Impaired Loans Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 2,981 $ 2,981 December 31, 2018 $ — $ — $ 3,894 $ 3,894 OREO Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 167 $ 167 December 31, 2018 $ — $ — $ 689 $ 689 Servicing Rights Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 12,914 $ 12,914 December 31, 2018 $ — $ — $ 14,593 $ 14,593 Quantitative Information about Level 3 Fair Value Measurements - Shown in the table below is the fair value of financial instruments measured under a Level 3 unobservable input on a recurring and nonrecurring basis at March 31, 2019: Level 3 Significant Range Weighted Fair Value Instruments Valuation Technique Unobservable Inputs (Weighted Average) Average RECURRING Interest rate lock commitments with customers Quoted market prices Pull-through expectations 80% - 99% 95.0 % Individual forward sale commitments with investors Quoted market prices Pull-through expectations 80% - 99% 95.0 % NONRECURRING Impaired loans Fair value of underlying collateral Discount applied to the obtained appraisal 0% - 50% 11.2 % OREO Fair value of collateral Discount applied to the obtained appraisal 0% - 75% 35.7 % Servicing rights Industry sources Pre-payment speeds 10% - 26% 13.5 % An increase in the pull-through rate utilized in the fair value measurement of the interest rate lock commitments with customers and forward sale commitments with investors will result in positive fair value adjustments (and an increase in the fair value measurement). Conversely, a decrease in the pull-through rate will result in a negative fair value adjustment (and a decrease in the fair value measurement). The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the three months ended March 31, 2019 and 2018: Net change in fair value for gains/ Purchases (losses) relating to Beginning and Sales and Ending items held at end of Balance issuances settlements Balance at end of year 2019 Interest rate lock commitments with customers $ 503 $ 1,931 $ (1,748) $ 686 $ 183 Individual forward sale commitments with investors (34) (162) 100 (96) (62) 2018 Interest rate lock commitments with customers $ 726 $ 2,435 $ (2,346) $ 815 $ 89 Individual forward sale commitments with investors 51 573 (620) 4 (47) Gains (losses) on interest rate lock commitments carried at fair value are recorded in other noninterest income. Gains (losses) on forward sale commitments with investors carried at fair value are recorded within other noninterest income. Fair value estimates are based on existing balance sheet financial instruments without attempting to estimate the value of anticipated future business. The fair value has not been estimated for assets and liabilities that are not considered financial instruments. Financial Instruments with Book Value 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 book value. These instruments include cash and cash equivalents and certificates of deposit at other financial institutions, FHLB stock, BOLI, accrued interest, and off-balance sheet instruments. Fair Value Estimates - The following methods and assumptions were used by the Company in estimating the fair values of financial instruments disclosed in following financial instruments table: Loans Receivable, Net - Fair values for loans are estimated using an exit price assumption (Level 3). Deposits - The fair value of deposits with no stated maturity date is included at the amount payable on demand. Fair values for fixed rate certificates of deposit are estimated using an exit price assumption (Level 2). Borrowings - The carrying amounts of advances maturing within 90 days approximate their fair values. The fair values of long-term advances are estimated using discounted cash flow analyses based on the Bank’s current incremental borrowing rates for similar types of borrowing arrangements (Level 2). Subordinated Note - The fair value of the Subordinated Note is based upon the average yield of debt issuances for similarly sized issuances (Level 2). The following table provides estimated fair values of the Company’s financial instruments at March 31, 2019 and December 31, 2018, whether or not recognized at fair value on the Consolidated Balance Sheets: March 31, December 31, 2019 2018 Carrying Fair Carrying Fair Amount Value Amount Value Financial Assets Level 1 inputs: Cash and cash equivalents $ 63,074 $ 63,074 $ 32,779 $ 32,779 Certificates of deposit at other financial institutions 22,073 22,073 22,074 22,074 Level 2 inputs: Securities available-for-sale, at fair value 99,783 99,783 97,205 97,205 Loans held for sale, at fair value 45,591 45,591 51,195 51,195 FHLB stock, at cost 8,157 8,157 9,887 9,887 Accrued interest receivable 5,812 5,812 5,761 5,761 Level 3 inputs: Loans receivable, gross 1,297,070 1,302,247 1,326,238 1,320,341 Servicing rights, held at lower of cost or fair value 10,611 12,914 10,429 14,593 Fair value interest rate locks with customers 686 686 503 503 Financial Liabilities Level 2 inputs: Deposits 1,321,550 1,310,404 1,274,219 1,261,096 Borrowings 86,824 86,609 137,149 136,873 Subordinated note 9,870 10,242 9,865 10,242 Accrued interest payable 504 504 344 344 Paired off commitments with investors 160 160 64 64 Individual forward sale commitments with investors 301 301 540 540 Level 3 inputs: Individual forward sale commitments with investors 96 96 34 34

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2019
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 12 - EMPLOYEE BENEFITS Employee Stock Ownership Plan On January 1, 2012, the Company established an ESOP for eligible employees of the Company and the Bank. Employees of the Company and the Bank are eligible to participate in the ESOP if they have been credited with at least 1,000 hours of service during the employees’ first 12‑month period and based on the employee’s anniversary date will be vested in the ESOP. The employee will be 100% vested in the ESOP after two years of working at least 1,000 hours in each of those two years. The ESOP borrowed $2.6 million from FS Bancorp, Inc. and used those funds to acquire 259,210 shares of FS Bancorp, Inc. common stock in the open market at an average price of $10.17 per share during the second half of 2012. It is anticipated that the Bank will make contributions to the ESOP in amounts necessary to amortize the ESOP loan payable to FS Bancorp, Inc. over a period of 10 years, bearing interest at 2.30%. Intercompany expenses associated with the ESOP are eliminated in consolidation. Shares purchased by the ESOP with the loan proceeds are held in a suspense account and allocated to ESOP participants on a pro rata basis as principal and interest payments are made by the ESOP to FS Bancorp, Inc. 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. Payments of principal and interest are due annually on December 31, the Company’s fiscal year end. On December 31, 2018, the ESOP paid the seventh annual installment of principal in the amount of $269,000, plus accrued interest of $26,000 pursuant to the ESOP loan agreement. As shares are committed to be released from collateral, the Company reports compensation expense equal to the average daily market prices of the shares at March 31, 2019 for the prior 90 days. These shares become outstanding for earnings per share 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, 2019 and 2018 was $321,000 and $359,000, respectively. Shares held by the ESOP at March 31, 2019 and 2018 were as follows (shown as actual): Balances Balances at March 31, 2019 at March 31, 2018 Allocated shares 176,809 153,049 Committed to be released shares 6,480 6,480 Unallocated shares 71,283 97,204 Total ESOP shares 254,572 256,733 Fair value of unallocated shares (in thousands) $ 3,530 $ 5,382

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 13 - EARNINGS PER SHARE Basic earnings per share are computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Unvested share-based awards containing non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and are included in the computation of earnings per share pursuant to the two-class method, described in the Accounting Standard Codification for Earnings Per Share. 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. For earnings per share calculations, the ESOP shares committed to be released are included as outstanding shares for both basic and diluted 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, 2019 and 2018 (shown as actual): At or For the Three Months Ended March 31, Numerator: 2019 2018 Net income (in thousands) $ 5,192 $ 4,322 Denominator: Basic weighted average common shares outstanding 4,355,307 3,556,581 Dilutive shares 138,119 194,956 Diluted weighted average common shares outstanding 4,493,426 3,751,537 Basic earnings per share $ 1.19 $ 1.22 Diluted earnings per share $ 1.15 $ 1.15 Potentially dilutive weighted average share options that were not included in the computation of diluted earnings per share because to do so would be anti-dilutive 44,488 — Potential dilutive shares are excluded from computation of earnings per share if their effect is anti-dilutive. Certain options to purchase common stock shares were not included in the computation of diluted earnings per share because their exercise price resulted in them being anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	NOTE 14 - STOCK-BASED COMPENSATION Stock Options and Restricted Stock On May 17, 2018, the shareholders of FS Bancorp, Inc. approved the 2018 Equity Incentive Plan (the “2018 Plan”) that authorizes 650,000 shares of the Company’s common stock to be awarded. The 2018 Plan pr ovides for the grant of incentive stock options, non-qualified stock options, and up to 163,000 restricted stock awards (“RSAs”) to directors, emeritus directors, officers, employees or advisory directors of the Company. On August 15, 2018, the Company awarded grants of 25,000 RSAs and 100,000 stock options with an exercise price equal to the market price of FS Bancorp’s common stock at the grant date of $58.60 per share. In September 2013, the shareholders of FS Bancorp, Inc. approved the FS Bancorp, Inc. 2013 Equity Incentive Plan (the “2013 Plan”). The Plan provides for the grant of stock options and RSAs. The 2013 Plan authorizes the grant of stock options totaling 324,013 shares of common stock to Company directors and employees of which 322,000 option share awards were granted with an exercise price equal to the market price of FS Bancorp’s common stock at the grant date of May 8, 2014, of $16.89 per share. The 2013 Plan authorizes the grant of RSAs totaling 129,605 shares to Company directors, advisory directors, emeritus directors, officers, and employees, and 125,105 shares were granted on May 8, 2014 at a grant date fair value of $16.89 per share. The remaining 4,500 RSAs were granted January 1, 2016 at a grant date fair value of $26.00 per share. Total share-based compensation expense for both plans was $262,000 for the three months ended March 31, 2019, and $135,000 for the 2013 Plan for the three months ended March 31, 2018. Stock Options Both plans consist of stock option awards that may be granted as incentive stock options or non-qualified stock options. Options typically vest over a period of five years with 20% vesting on the anniversary date of each grant date as long as the award recipient remains in service to the Company. The options are exercisable after vesting for up to the remaining term of the original grant. The maximum term of the options granted is 10 years. Any unexercised stock options will expire 10 years after the grant date or sooner in the event of the award recipient’s termination of service with the Company or the Bank. At March 31, 2019, there were 387,000 and 6,013 option share awards available to be granted under the 2018 Plan and the 2013 Plan, respectively. The fair value of each option award is estimated on the grant date using a Black-Scholes Option pricing model that uses the following assumptions. The dividend yield is based on the current quarterly dividend in effect at the time of the grant. Historical employment data is used to estimate the forfeiture rate. The Company elected to use Staff Accounting Bulletin 107, simplified expected term calculation for the “Share-Based Payments” method permitted by the SEC to calculate the expected term. This method uses the vesting term of an option along with the contractual term, setting the expected life at 6.5 years. The following table presents a summary of the Company’s stock option awards during the three months ended March 31, 2019 (shown as actual): Weighted-Average Weighted- Remaining Average Contractual Term In Aggregate Shares Exercise Price Years Intrinsic Value Outstanding at January 1, 2019 290,104 $ 31.27 6.83 $ 4,940,803 Granted — — — — Less exercised 2,600 $ 16.89 — $ 92,131 Forfeited or expired — — — — Outstanding at March 31, 2019 287,504 $ 31.40 6.54 $ 6,298,259 Expected to vest, assuming a 0.31% annual forfeiture rate (1) 286,750 $ 31.33 6.53 $ 6,297,620 Exercisable at March 31, 2019 130,204 $ 16.89 4.98 $ 4,373,552 __________________________ (1) Forfeiture rate has been calculated and estimated to assume a forfeiture of 3.1% of the options forfeited over 10 years. At March 31, 2019, there was $1.2 million of total unrecognized compensation cost related to nonvested stock options granted under both plans. The cost is expected to be recognized over the remaining weighted-average vesting period of 4.3 years. Restricted Stock Awards The RSAs’ fair value is equal to the value on the grant date. Compensation expense is recognized over the vesting period of the awards based on the fair value of the restricted stock. Shares in the 2013 Plan awarded as restricted stock typically vest ratably over a three-year period for directors and a five-year period for employees, beginning at the grant date, and for the 2018 Plan, shares typically vest ratably over a five-year period for both directors and employees beginning at the grant date. Any unvested RSAs will expire after vesting or sooner in the event of the award recipient’s termination of service with the Company or the Bank. The following table presents a summary of the Company’s nonvested awards during the three months ended March 31, 2019 (shown as actual): Weighted-Average Grant-Date Fair Value Nonvested Shares Shares Per Share Nonvested at January 1, 2019 43,421 $ 41.22 Granted — — Less vested 3,300 $ 21.03 Forfeited or expired — — Nonvested at March 31, 2019 40,121 $ 42.88 At March 31, 2019, there was $1.3 million of total unrecognized compensation costs related to nonvested shares granted under both plans as RSAs. The cost is expected to be recognized over the remaining weighted-average vesting period of 4.3 years. The total fair value of shares vested for the three months ended March 31, 2019 and 2018 was $162,000 and $82,000, respectively.

Regulatory Capital

Regulatory Capital	3 Months Ended
	Mar. 31, 2019
Regulatory Capital Requirements [Abstract]
Regulatory Capital	NOTE 15 - REGULATORY CAPITAL The Bank is subject to various regulatory capital requirements administered by the Federal Reserve and the FDIC. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines of the regulatory framework for prompt corrective action, the Bank must meet specific capital adequacy guidelines that involve quantitative measures of the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Bank’s capital classification is also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the table below) of Tier 1 capital (as defined in the regulations) to total average assets (as defined), and minimum ratios of Tier 1 total capital (as defined) and common equity Tier 1 (“CET 1”) capital to risk-weighted assets (as defined). The Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 leverage, and CET 1 capital ratios as set forth in the table below to be categorized as well capitalized. At March 31, 2019 and December 31, 2018, the Bank was categorized as well capitalized under applicable regulatory requirements. There are no conditions or events since that notification that management believes have changed the Bank’s category. Management believes, at March 31 2019, that the Bank met all capital adequacy requirements. The following table compares the Bank’s actual capital amounts and ratios at March 31, 2019 and December 31, 2018 to their minimum regulatory capital requirements and well capitalized regulatory capital at those dates (dollars in thousands): To be Well Capitalized Under Prompt For Capital For Capital Adequacy Corrective Actual Adequacy Purposes with Capital Buffer Action Provisions Bank Only Amount Ratio Amount Ratio Amount Ratio Amount Ratio At March 31, 2019 Total risk-based capital (to risk-weighted assets) $ 193,032 14.73 % $ 104,832 8.00 % $ 137,592 10.50 % $ 131,040 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 180,902 13.81 % $ 78,624 6.00 % $ 111,384 8.50 % $ 104,832 8.00 % Tier 1 leverage capital (to average assets) $ 180,902 11.01 % $ 65,702 4.00 % $ — N/A $ 82,127 5.00 % CET 1 capital (to risk-weighted assets) $ 180,902 13.81 % $ 58,968 4.50 % $ 91,728 7.00 % $ 85,176 6.50 % At December 31, 2018 Total risk-based capital (to risk-weighted assets) $ 188,472 13.52 % $ 111,493 8.00 % $ 137,694 9.88 % $ 139,366 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 175,824 12.62 % $ 83,620 6.00 % $ 109,820 7.88 % $ 111,493 8.00 % Tier 1 leverage capital (to average assets) $ 175,824 10.67 % $ 65,884 4.00 % $ — N/A $ 82,355 5.00 % CET 1 capital (to risk-weighted assets) $ 175,824 12.62 % $ 62,715 4.50 % $ 88,846 6.38 % $ 90,588 6.50 % In addition to the minimum CET 1, Tier 1, total capital, and leverage ratios, the Bank is required to maintain a capital conservation buffer consisting of additional CET 1 capital greater than 2.5% of risk-weighted assets above the required minimum levels in order to avoid limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses based on percentages of eligible retained income that could be utilized for such actions. At March 31, 2019, the Bank’s capital conservation buffer was 6.73%. FS Bancorp, Inc. is a bank holding company registered with the Federal Reserve. Bank holding companies are subject to capital adequacy requirements of the Federal Reserve under the Bank Holding Company Act of 1956, as amended, and the regulations of the Federal Reserve. For a bank holding company with less than $3.0 billion in assets, the capital guidelines apply on a bank only basis and the Federal Reserve expects the holding company’s subsidiary bank to be well capitalized under the prompt corrective action regulations. If FS Bancorp, Inc. was subject to regulatory guidelines for bank holding companies with $3.0 billion or more in assets at March 31, 2019, FS Bancorp, Inc. would have exceeded all regulatory capital requirements. The regulatory capital ratios calculated for FS Bancorp, Inc. at March 31, 2019 were 11.1% for Tier 1 leverage-based capital, 13.0% for Tier 1 risk-based capital, 13.9% for total risk-based capital, and 13.0% for CET 1 capital ratio, compared to 12.2%, 14.5%, 15.8%, and 14.5% at March 31, 2018, respectively.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segments	NOTE 16 - BUSINESS SEGMENTS The Company’s business segments are determined based on the products and services provided, as well as the nature of the related business activities, and they reflect the manner in which financial information is currently evaluated by management. This process is dynamic and is based on management’s current view of the Company’s operations and is not necessarily comparable with similar information for other financial institutions. We define our business segments by product type and customer segment which we have organized into two lines of business: commercial and consumer banking and home lending. We use various management accounting methodologies to assign certain income statement items to the responsible operating segment, including:  a funds transfer pricing (“FTP”) system, which allocates interest income credits and funding charges between the segments, assigning to each segment a funding credit for its liabilities, such as deposits, and a charge to fund its assets;  a cost per loan serviced allocation based on the number of loans being serviced on the balance sheet and the number of loans serviced for third parties;  an allocation based upon the approximate square footage utilized by the home lending segment in Company owned locations;  an allocation of charges for services rendered to the segments by centralized functions, such as corporate overhead, which are generally based on the number of full time employees (“FTEs”) in each segment; and  an allocation of the Company’s consolidated income taxes which are based on the effective tax rate applied to the segment’s pretax income or loss. The FTP methodology is based on management’s estimated cost of originating funds including the cost of overhead for deposit generation. A description of the Company’s business segments and the products and services that they provide is as follows: Commercial and Consumer Banking Segment The commercial and consumer banking segment provides diversified financial products and services to our commercial and consumer customers through Bank branches, automated teller machines (“ATM”), online banking platforms, mobile banking apps, and telephone banking. These products and services include deposit products; residential, consumer, business and commercial real estate lending portfolios and cash management services. We originate consumer loans, commercial and multi-family real estate loans, construction loans for residential and multi-family construction, and commercial business loans. At March 31, 2019, our retail deposit branch network consisted of 21 branches in the Pacific Northwest. At March 31, 2019 and December 31, 2018, our deposits totaled $1.32 billion and $1.27 billion, respectively. This segment is also responsible for the management of our investment portfolio and other assets of the Bank. Home Lending Segment The home lending segment originates one-to-four-family residential mortgage loans primarily for sale in the secondary markets as well as originating adjustable rate mortgage (“ARM”) loans held for investment. The majority of our mortgage loans are sold to or securitized by FNMA, FHLMC, GNMA, or FHLB, while we retain the right to service these loans. Loans originated under the guidelines of the Federal Housing Administration or FHA, US Department of Veterans Affairs or VA, and United States Department of Agriculture or USDA are generally sold servicing released to a correspondent bank or mortgage company. We have the option to sell loans on a servicing-released or servicing-retained basis to securitizers and correspondent lenders. A small percentage of our loans are brokered to other lenders. On occasion, we may sell a portion of our MSR portfolio and we may sell small pools of loans initially originated to be held in the loan portfolio. We manage the loan funding and the interest rate risk associated with the secondary market loan sales and the retained one-to-four-family mortgage servicing rights within this business segment. One-to-four-family loans originated for investment are allocated to the home lending segment with a corresponding provision expense and FTP for cost of funds. Segment Financial Results The tables below summarize the financial results for each segment based primarily on the number of FTEs and assets within each segment for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 1,071 $ 16,618 $ 17,689 Provision for loan losses (59) (691) (750) Noninterest income 2,419 2,136 4,555 Noninterest expense (3,304) (11,493) (14,797) Income before provision for income taxes 127 6,570 6,697 Provision for income taxes (29) (1,476) (1,505) Net income $ 98 $ 5,094 $ 5,192 Total average assets at period end $ 239,287 $ 1,375,574 $ 1,614,861 FTEs 112 314 426 At or For the Three Months Ended March 31, 2018 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 715 $ 10,782 $ 11,497 Provision for loan losses 4 (354) (350) Noninterest income 3,766 1,258 5,024 Noninterest expense (4,056) (6,980) (11,036) Income before provision for income taxes 429 4,706 5,135 Provision for income taxes (68) (745) (813) Net income $ 361 $ 3,961 $ 4,322 Total average assets at period end $ 216,384 $ 800,334 $ 1,016,718 FTEs 116 213 329 ___________________________ (1) Net interest income is the difference between interest earned on assets and the cost of liabilities to fund those assets. Interest earned includes actual interest earned on segment assets and, if the segment has excess liabilities, interest credits for providing funding to the other segment. The cost of liabilities includes interest expense on segment liabilities and, if the segment does not have enough liabilities to fund its assets, a funding charge based on the cost of assigned liabilities to fund segment assets.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	NOTE 17 - GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and certain other intangibles generally arise from business combinations accounted for under the acquisition method of accounting. Goodwill totaled $2.3 million at March 31, 2019 and December 31, 2018, and represents the excess of the total acquisition price paid over the fair value of the assets acquired, net of the fair values of liabilities assumed as a result of the Branch Purchase in 2016. Goodwill is not amortized but is evaluated for impairment on an annual basis at December 31 of each year or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company performed an impairment analysis at December 31, 2018, and determined that no impairment of goodwill existed. No events or circumstances since the December 31, 2018 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment existed at March 31, 2019. The following table summarizes the changes in the Company’s other intangible assets comprised solely of CDI for the year ended December 31, 2018, and the three months ended March 31, 2019. Other Intangible Assets Accumulated Gross CDI Amortization Net CDI Balance, December 31, 2017 $ 2,239 $ (922) $ 1,317 Amortization — (307) (307) Additions as a result of the Anchor Acquisition (1) 5,251 (44) 5,207 Balance, December 31, 2018 7,490 (1,273) 6,217 Amortization — (190) (190) Balance, March 31, 2019 $ 7,490 $ (1,463) $ 6,027 ____________________________ (1) See “Note 2 - Business Combination.” The CDI represents the fair value of the acquired core deposit base acquired in business combinations. The CDI will be amortized on a straight-line basis over 10 years for the CDI related to the Anchor Acquisition and on an accelerated basis over approximately nine years for the CDI related to the Branch Purchase. Total amortization expense was $190,000 for the three months ended March 31, 2019, and $77,000 for the same period in 2018. Amortization expense for core deposit intangible is expected to be as follows at March 31, 2019: Remainder of 2019 570 2020 706 2021 691 2022 691 2023 691 Thereafter 2,678 Total $ 6,027

Revenue From Contracts With Cus

Revenue From Contracts With Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	NOTE 18 - REVENUE FROM CONTRACTS WITH CUSTOMERS Revenue Recognition In accordance with Topic 606, revenues are recognized when control of promised goods or services is transferred to customers in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of Topic 606, the Company performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the Company satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. At contract inception, once the contract is determined to be within the scope of Topic 606, the Company assesses the goods or services that are promised within each contract and identifies those that contain performance obligations, and assesses whether each promised good or service is distinct. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied. All of the Company’s revenue from contracts with customers in scope of ASC 606 is recognized in noninterest income and included in our commercial and consumer banking segment. For the three months ended March 31, 2019, the Company recognized $1.1 million in total deposit fees, which included $423,000 of debit card interchange fees and $271,000 of fees from non-sufficient funds, both considered within the scope of ASC 606, and $3.9 million of noninterest income considered not within the scope of ASC 606, compared to $551,000 in total deposit fees including 260,000 of debit card interchange fees, $120,000 of fees from non-sufficient funds, and $4.6 million of noninterest income considered not within the scope of ASC 606 for the three months ended March 31, 2018. Deposit Fees The Bank earns fees from its deposit customers for account maintenance, transaction-based services, and overdraft charges. 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 wire fees, as well as charges against the account, such as fees for non-sufficient funds and overdrafts. 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 ATM interchange income represent fees earned when a debit card issued by the Bank is used. The Bank earns interchange fees from debit cardholder transactions through the Visa payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder. The performance obligation is satisfied and the fees are earned when the cost of the transaction is charged to the cardholders’ debit card. Certain expenses directly associated with the debit card are recorded on a net basis with the interchange income.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Financial Statement Presentation	Financial Statement Presentation - The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and in accordance with the instructions to Form 10‑Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission (“SEC”). It is recommended that these unaudited interim consolidated financial statements be read in conjunction with the Company’s Annual Report on Form 10‑K with all of the audited information and footnotes required by U.S. GAAP for complete financial statements for the year ended December 31, 2018, as filed with the SEC on March 15, 2019. In the opinion of management, all normal adjustments and recurring accruals considered necessary for a fair presentation of the financial position and results of operations for the periods presented have been included. The results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019, or any other future period. The preparation of financial statements, in conformity with U.S. GAAP, requires management to make estimates and assumptions that affect amounts reported in the financial statements. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan and lease losses, fair value of financial instruments, the valuation of servicing rights, and the deferred income taxes. Amounts presented in the consolidated financial statements and footnote tables are rounded and presented to the nearest thousands of dollars except per share amounts. If the amounts are above $1.0 million, they are rounded one decimal point, and if they are above $1.0 billion, they are rounded two decimal points.
Principles of Consolidation	Principles of Consolidation - The consolidated financial statements include the accounts of FS Bancorp, Inc. and its wholly owned subsidiary, 1st Security Bank of Washington. All material intercompany accounts have been eliminated in consolidation.
Segment Reporting, Policy	Segment Reporting - The Company operates in two business segments through the Bank: commercial and consumer banking and home lending. The Company’s business segments are determined based on the products and services provided, as well as the nature of the related business activities, and they reflect the manner in which financial information is regularly reviewed for the purpose of allocating resources and evaluating performance of the Company’s businesses. The results for these business segments are based on management’s accounting process, which assigns income statement items and assets to each responsible operating segment. This process is dynamic and is based on management’s view of the Company’s operations. See “Note 16 - Business Segments.”
Subsequent Events	Subsequent Events - The Company has evaluated events and transactions subsequent to March 31, 2019 for potential recognition or disclosure.
Loan Portfolio Segment	The Company has defined its loan portfolio into three segments that reflect the structure of the lending function, the Company’s strategic plan and the manner in which management monitors performance and credit quality. The three loan portfolio segments are: (a) Real Estate Loans, (b) Consumer Loans, and (c) Commercial Business Loans. Each of these segments is disaggregated into classes based on the risk characteristics of the borrower and/or the collateral type securing the loan. The following is a summary of each of the Company’s loan portfolio segments and classes: Real Estate Loans Commercial Lending . Loans originated by the Company primarily secured by income producing properties, including retail centers, warehouses, and office buildings located in our market areas. Construction and Development Lending . Loans originated by the Company for the construction of, and secured by, commercial real estate, one-to-four-family, and multi-family residences and tracts of land for development that are not pre-sold. A small portion of the one-to-four-family construction portfolio is custom construction loans to the intended occupant of the residence. Home Equity Lending . Loans originated by the Company secured by second mortgages on one-to-four-family residences, including home equity lines of credit in our market areas. One-to-Four-Family Real Estate Lending . One-to-four-family residential loans include owner occupied properties (including second homes), and non-owner occupied properties with four or less units. These loans originated by the Company are secured by first mortgages on one-to-four-family residences in our market areas that the Company intends to hold (excludes loans held for sale). Multi-Family Lending . Apartment term lending (five or more units) to current banking customers and community reinvestment loans for low to moderate income individuals in the Company’s footprint. Consumer Loans Indirect Home Improvement . Fixture secured loans for home improvement are originated by the Company through its network of home improvement contractors and dealers and are secured by the personal property installed in, on, or at the borrower’s real property, and may be perfected with a UCC‑2 financing statement filed in the county of the borrower’s residence. These indirect home improvement loans include replacement windows, siding, roofing, pools, and other home fixture installations. Solar. Fixture secured loans for solar related home improvement projects are originated by the Company through its network of contractors and dealers, and are secured by the personal property installed in, on, or at the borrower’s real property, and which may be perfected with a UCC‑2 financing statement filed in the county of the borrower’s residence. Marine . Loans originated by the Company, secured by boats, to borrowers primarily located in the states we originate consumer loans. Other Consumer. Loans originated by the Company to consumers in our retail branch footprint, including automobiles, recreational vehicles, direct home improvement loans, loans on deposits, and other consumer loans, primarily consisting of personal lines of credit and credit cards. Commercial Business Loans Commercial and Industrial Lending (“C&I”) . Loans originated by the Company to local small- and mid-sized businesses in our Puget Sound market area are secured primarily by accounts receivable, inventory, or personal property, plant and equipment. Some of the C&I loans purchased by the Company are outside of the Greater Puget Sound market area. C&I loans are made on the basis of the borrower’s ability to make repayment from the cash flow of the borrower’s business. Warehouse Lending . Loans originated to non-depository financial institutions and secured by notes originated by the non-depository financial institution. The Company has two distinct warehouse lending divisions: commercial warehouse re-lending secured by notes on construction loans and mortgage warehouse re-lending secured by notes on one-to-four-family loans. The Company’s commercial construction warehouse lines are secured by notes on construction loans and typically guaranteed by principals with experience in construction lending. Mortgage warehouse lending loans are funded through third-party residential mortgage bankers. Under this program the Company provides short-term funding to the mortgage banking companies for the purpose of originating residential mortgage loans for sale into the secondary market.
Nonaccrual and Past Due Loans	Non-accrual and 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. Loans are automatically placed on non-accrual once the loan is 90 days past due or sooner if, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, or as required by regulatory authorities.
Credit Quality Indicators	The Company utilizes a risk grading matrix to assign a risk grade to its real estate and commercial business loans. Loans are graded on a scale of 1 to 10, with loans in risk grades 1 to 6 considered “Pass” and loans in risk grades 7 to 10 are reported as classified loans in the Company’s allowance for loan loss analysis. A description of the 10 risk grades is as follows:  Grades 1 and 2 - These grades include loans to very high quality borrowers with excellent or desirable business credit.  Grade 3 - This grade includes loans to borrowers of good business credit with moderate risk.  Grades 4 and 5 - These grades include “Pass” grade loans to borrowers of average credit quality and risk.  Grade 6 - This grade includes loans on management’s “Watch” list and is intended to be utilized on a temporary basis for “Pass” grade borrowers where frequent and thorough monitoring is required due to credit weaknesses and where significant risk-modifying action is anticipated in the near term.  Grade 7 - This grade is for “Other Assets Especially Mentioned” (“OAEM”) in accordance with regulatory guidelines and includes borrowers where performance is poor or significantly less than expected.  Grade 8 - This grade includes “Substandard” loans in accordance with regulatory guidelines which represent an unacceptable business credit where a loss is possible if loan weakness is not corrected.  Grade 9 - This grade includes “Doubtful” loans in accordance with regulatory guidelines where a loss is highly probable.  Grade 10 - This grade includes “Loss” loans in accordance with regulatory guidelines for which total loss is expected and when identified are charged off. Consumer, Home Equity, and One-to-Four-Family Real Estate Loans Homogeneous loans are risk rated based upon the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy. Loans classified under this policy at the Company are consumer loans which include indirect home improvement, solar, marine, other consumer, and one-to-four-family first and second liens. Under the Uniform Retail Credit Classification Policy, loans that are current or less than 90 days past due are graded “Pass” and risk rated “4” or “5” internally. Loans that are past due more than 90 days are classified “Substandard” and risk rated “8” internally until the loan has demonstrated consistent performance, typically six months of contractual payments. Closed-end loans that are 120 days past due and open-end loans that are 180 days past due are charged off based on the value of the collateral less cost to sell.
Derivatives	The Company regularly enters into commitments to originate and sell loans held for sale. The Company has established a hedging strategy to protect itself against the risk of loss associated with interest rate movements on loan commitments. The Company enters into contracts to sell forward To-Be-Announced (“TBA”) mortgage-backed securities. These commitments and contracts are considered derivatives but have not been designated as hedging instruments for reporting purposes under U.S. GAAP. Rather, they are accounted for as free-standing derivatives, or economic hedges, with changes in the fair value of the derivatives reported in noninterest income. The Company recognizes all derivative instruments as either other assets or other liabilities on the Consolidated Balance Sheets and measures those instruments at fair value.
Loan Commitments	The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments.
Determination of Fair Market Values	The following methods were used to estimate the fair value of financial instruments on a recurring and nonrecurring basis: Securities Available-for-Sale - The fair value of securities available-for-sale are recorded on a recurring basis. The fair value of investments and mortgage-backed securities are provided by a third-party pricing service. These valuations are based on market data using pricing models that vary by asset class and incorporate available current trade, bid, and other market information, and for structured securities, cash flow, and loan performance data. The pricing processes utilize benchmark curves, benchmarking of similar securities, sector groupings, and matrix pricing. Option adjusted spread models are also used to assess the impact of changes in interest rates and to develop prepayment scenarios. Transfers between the fair value hierarchy are determined through the third-party service provider which, from time to time will transfer between levels based on market conditions per the related security. All models and processes used take into account market convention (Level 2). Mortgage Loans Held for Sale - The fair value of loans held for sale reflects the value of commitments with investors and/or the relative price as delivered into a TBA mortgage-backed security (Level 2). Derivative Instruments - The fair value of the interest rate lock commitments and forward sales commitments are estimated using quoted or published market prices for similar instruments, adjusted for factors such as pull-through rate assumptions based on historical information, where appropriate. TBA mortgage-backed securities are fair valued on similar contracts in active markets (Level 2) while locks and forwards with customers and investors are fair valued using similar contracts in the market and changes in the market interest rates (Level 2 and 3). Impaired Loans - Fair value adjustments to impaired collateral dependent loans are recorded to reflect partial write-downs based on the current appraised value of the collateral or internally developed models, which contain management’s assumptions. Management will utilize discounted cashflow impairment for TDRs when the change in terms results in a discount to the overall cashflows to be received (Level 3).
Employee Stock Ownership Plan	On January 1, 2012, the Company established an ESOP for eligible employees of the Company and the Bank. Employees of the Company and the Bank are eligible to participate in the ESOP if they have been credited with at least 1,000 hours of service during the employees’ first 12‑month period and based on the employee’s anniversary date will be vested in the ESOP. The employee will be 100% vested in the ESOP after two years of working at least 1,000 hours in each of those two years. As shares are committed to be released from collateral, the Company reports compensation expense equal to the average daily market prices of the shares at March 31, 2019 for the prior 90 days. These shares become outstanding for earnings per share 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.
Earnings Per Share	Basic earnings per share are computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Unvested share-based awards containing non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and are included in the computation of earnings per share pursuant to the two-class method, described in the Accounting Standard Codification for Earnings Per Share. 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. For earnings per share calculations, the ESOP shares committed to be released are included as outstanding shares for both basic and diluted earnings per share.
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016‑13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU requires the measurement of all current expected credit losses (“CECL”) for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of CECL. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. The ASU requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early application will be permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the impact of this ASU on the Company’s consolidated financial statements. Once adopted, we anticipate our allowance for loan losses to increase through a one‑time adjustment to retained earnings, however, until our evaluation is complete the magnitude of the increase will be unknown. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement . This ASU contains some technical adjustments related to the fair value disclosure requirements of public companies. Included in this ASU is the additional disclosure requirement of unrealized gains and losses for the period in recurring level 3 fair value disclosures and the range and weighted average of significant unobservable inputs, among other technical changes. ASU 2018-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for any removed or modified disclosures. The adoption of ASU 2018-13 is not expected to have a material impact on the Company's consolidated financial statements. In August 2018, FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . The amendments in this ASU broaden the scope of ASC Subtopic 350-40 to include costs incurred to implement a hosting arrangement that is a service contract. The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The costs are capitalized or expensed depending on the nature of the costs and the project stage during which they are incurred, consistent with the accounting for costs for internal-use software. The amendments in this ASU result in consistent capitalization of implementation costs of a hosting arrangement that is a service contract and implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this ASU. This ASU is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The amendments in this ASU should be applied either retrospectively to all implementation costs incurred after the date of adoption. Adoption of ASU 2018-15 is not expected to have a material impact on the Company’s Consolidated Financial Statements.
Application of New Accounting Guidance	Application of New Accounting Guidance Adopted in 2019 On January 1, 2019, the Company adopted FASB ASU No. 2016‑02, Leases (Topic 842) . ASU No. 2016‑02 requires lessees to recognize on the balance sheet the assets and liabilities arising from operating leases. A lessee should recognize a liability to make lease payments and an ROU asset representing its right to use the underlying asset for the lease term. A lessee should include payments to be made in an optional period only if the lessee is reasonably certain to exercise an option to extend the lease or not to exercise an option to terminate the lease. For operating leases, the lease cost should be allocated over the lease term on a generally straight-line basis. In July 2018, the FASB issued ASU No, 2018-10, Codification Improvements to Topic 842, Leases and ASU No. 2018-11, Leases (Topic 842): Targeted Improvements . These ASUs contain clarifications to ASU 2016-02, including providing a new transition method in addition to the existing transition method contained in ASU No. 2016-02 to allow entities to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. These amendments have the same effective date as ASU 2016-02. In March 2019, FASB issued ASU 2019-01, Leases (Topic 842), Codification Improvements . The amendment in this ASU that is applicable to the Company is Item 3 which clarifies interim disclosure requirements that allow omission of required transition disclosures. The effective date for this item is the same as ASU 2016-02. For financial reporting purposes, the Company applied the modified retrospective transition approach and elected to apply the transition option included in ASU 2018-11 on the effective date, January 1, 2019 which eliminates the requirement for reporting comparative periods presented in the financial statements prior to that date. The new standard provides for a number of practical expedients in transition. The Company elected the package of practical expedients, which permits us to not reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. The Company also elected the use-of-hindsight and elected the practical expedient to not separate lease and non-lease components on our real estate leases where we are the lessee. The Company did not elect the practical expedient pertaining to land easement as it is not applicable to us. The new standard also provides practical expedients for an entity's ongoing accounting. The Company has elected the short-term lease recognition exemption for certain leases which are less than 12 months in duration or month-to-month. This means, for those leases that qualify, ROU assets or lease liabilities will not be recognized. The adoption of this ASU created ROU assets of $4.8 million and operating lease liabilities of $5.0 million, and the related impact to the Company’s March 31, 2019 Consolidated Balance Sheet was approximately 0.3%. Additional disclosures required by the ASU have been included in “Note 7 - Leases.”

Business Combination (Tables)

Business Combination (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combination [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Acquired Book Fair Value Amount November 15, 2018 Value Adjustments Recorded Assets Cash and cash equivalents $ 54,558 $ — $ 54,558 Securities available-for-sale 19,609 (54) 19,555 Loans receivable, net 361,596 (5,321) (1) 356,275 Premises and equipment, net 8,411 3,354 (2) 11,765 Other real estate owned 689 — 689 Deferred tax asset 4,097 (3,358) 739 Mortgage servicing rights 218 564 782 Core deposit intangible ("CDI") — 5,251 (3) 5,251 Other assets 25,231 18 25,249 Total assets acquired $ 474,409 $ 454 $ 474,863 Liabilities Deposits $ 357,863 $ (1,052) (4) $ 356,811 Borrowings 37,000 (282) 36,718 Other liabilities 9,286 63 9,349 Total liabilities assumed $ 404,149 $ (1,271) $ 402,878
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	At November 15, 2018 Purchase price of Anchor Fair value of FS Bancorp common stock at $46.54 (1) per share for 725,518 shares $ Cash paid Total purchase price Fair value of assets acquired: Cash and cash equivalents $ 54,558 Securities available-for-sale 19,555 Loans receivable, net 356,275 Premises and equipment 11,765 OREO 689 Deferred tax asset 739 Mortgage servicing rights 782 Intangible assets – CDI 5,251 Other assets 25,249 Total assets and identifiable intangible assets acquired $ 474,863 Fair value of liabilities assumed: Deposits $ 356,811 Borrowings 36,718 Other liabilities 9,349 Total liabilities assumed $ 402,878 Fair value of net assets and identifiable intangible assets acquired Bargain purchase gain $

Securities Available-for-sale (

Securities Available-for-sale (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The following tables present the amortized costs, unrealized gains, unrealized losses, and estimated fair values of securities available-for-sale at March 31, 2019 and December 31, 2018: March 31, 2019 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 13,045 $ 42 $ (42) $ 13,045 Corporate securities 8,556 21 (37) 8,540 Municipal bonds 14,412 178 (116) 14,474 Mortgage-backed securities 49,632 123 (503) 49,252 U.S. Small Business Administration securities 14,694 — (222) 14,472 Total securities available-for-sale $ 100,339 $ 364 $ (920) $ 99,783 December 31, 2018 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 16,052 $ 32 $ (197) $ 15,887 Corporate securities 7,074 — (209) 6,865 Municipal bonds 14,446 23 (275) 14,194 Mortgage-backed securities 45,827 83 (1,074) 44,836 U.S. Small Business Administration securities 15,690 — (267) 15,423 Total securities available-for-sale $ 99,089 $ 138 $ (2,022) $ 97,205
Schedule of Unrealized Loss on Investments	Investment securities that were in an unrealized loss position at March 31, 2019 and December 31, 2018 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position. Management believes that these securities are only temporarily impaired due to changes in market interest rates or the widening of market spreads subsequent to the initial purchase of the securities, and not due to concerns regarding the underlying credit of the issuers or the underlying collateral. March 31, 2019 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ — $ — $ 4,952 $ (42) $ 4,952 $ (42) Corporate securities 2,486 (6) 5,033 (31) 7,519 (37) Municipal bonds — — 5,082 (116) 5,082 (116) Mortgage-backed securities 2,305 (6) 28,913 (497) 31,218 (503) U.S. Small Business Administration securities — — 14,472 (222) 14,472 (222) Total $ 4,791 $ (12) $ 58,452 $ (908) $ 63,243 $ (920) December 31, 2018 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 6,018 $ (25) $ 4,822 $ (172) $ 10,840 $ (197) Corporate securities 975 (25) 5,890 (184) 6,865 (209) Municipal bonds 2,098 (22) 8,787 (253) 10,885 (275) Mortgage-backed securities 6,266 (40) 32,537 (1,034) 38,803 (1,074) U.S. Small Business Administration securities 1,958 (11) 13,465 (256) 15,423 (267) Total $ 17,315 $ (123) $ 65,501 $ (1,899) $ 82,816 $ (2,022)
Schedule of Available for Sale Securities by Contractual Maturity	The contractual maturities of securities available-for-sale at March 31, 2019 and December 31, 2018 are listed below. Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers may have the right to call or prepay the obligations; therefore, these securities are classified separately with no specific maturity date. March 31, 2019 December 31, 2018 Amortized Fair Amortized Fair Cost Value Cost Value U.S. agency securities Due after one year through five years $ 1,041 $ 1,048 $ 1,043 $ 1,040 Due after five years through ten years 7,006 7,011 10,011 9,941 Due after ten years 4,998 4,986 4,998 4,906 Subtotal 13,045 13,045 16,052 15,887 Corporate securities Due after one year through five years 7,064 7,048 6,077 5,947 Due after five years through ten years 1,492 1,492 997 918 Subtotal 8,556 8,540 7,074 6,865 Municipal bonds Due after one year through five years 2,659 2,619 2,659 2,570 Due after five years through ten years 2,599 2,661 2,610 2,592 Due after ten years 9,154 9,194 9,177 9,032 Subtotal 14,412 14,474 14,446 14,194 Mortgage-backed securities Federal National Mortgage Association (“FNMA”) 31,691 31,571 30,554 30,026 Federal Home Loan Mortgage Corporation (“FHLMC”) 10,008 9,812 10,301 9,961 Government National Mortgage Association (“GNMA”) 7,933 7,869 4,972 4,849 Subtotal 49,632 49,252 45,827 44,836 U.S. Small Business Administration securities Due after one year through five years 862 841 — — Due after five years through ten years 12,061 11,884 13,828 13,581 Due after ten years 1,771 1,747 1,862 1,842 Subtotal 14,694 14,472 15,690 15,423 Total $ 100,339 $ 99,783 $ 99,089 $ 97,205
Schedule of Realized Gain (Loss)	There were no sales proceeds, gains, or losses for the three months ended March 31, 2019, compared to the proceeds and resulting gains and losses, computed using specific identification from sales of securities available-for-sale for the three months ended March 31, 2018 shown below: March 31, 2018 Gross Gross Proceeds Gains (Losses) Securities available-for-sale $ 5,305 $ 113 $ —

Loans Receivable and Allowanc_2

Loans Receivable and Allowance For Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The composition of the loan portfolio was as follows at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 2018 REAL ESTATE LOANS Commercial $ 208,607 $ 204,699 Construction and development 219,229 247,306 Home equity 40,714 40,258 One-to-four-family (excludes loans held for sale) 261,868 249,397 Multi-family 102,997 104,663 Total real estate loans 833,415 846,323 CONSUMER LOANS Indirect home improvement 174,792 167,793 Solar 44,494 44,433 Marine 59,884 57,822 Other consumer 5,246 5,425 Total consumer loans 284,416 275,473 COMMERCIAL BUSINESS LOANS Commercial and industrial 137,325 138,686 Warehouse lending 41,914 65,756 Total commercial business loans 179,239 204,442 Total loans receivable, gross 1,297,070 1,326,238 Allowance for loan losses (11,845) (12,349) Deferred costs and fees, net (2,710) (2,907) Premiums on purchased loans 1,408 1,537 Total loans receivable, net $ 1,283,923 $ 1,312,519
Allowance for Credit Losses on Financing Receivables	The following tables detail activity in the allowance for loan losses by loan categories at or for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 5,761 $ 3,351 $ 3,191 $ 46 $ 12,349 Provision for loan losses 24 114 691 (79) 750 Charge-offs — (250) (1,152) — (1,402) Recoveries — 148 — — 148 Net charge-offs — (102) (1,152) — (1,254) Ending balance $ 5,785 $ 3,363 $ 2,730 $ (33) $ 11,845 Period end amount allocated to: Loans individually evaluated for impairment $ 173 $ 160 $ — $ — $ 333 Loans collectively evaluated for impairment 5,612 3,203 2,730 (33) 11,512 Ending balance $ 5,785 $ 3,363 $ 2,730 $ (33) $ 11,845 LOANS RECEIVABLE Loans individually evaluated for impairment $ 1,156 $ 457 $ 431 $ — $ 2,044 Loans collectively evaluated for impairment 832,259 283,959 178,808 — 1,295,026 Ending balance $ 833,415 $ 284,416 $ 179,239 $ — $ 1,297,070 At or For the Three Months Ended March 31, 2018 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 Provision for loan losses 14 84 295 (43) 350 Charge-offs (4) (228) — — (232) Recoveries — 264 2 — 266 Net (charge-offs) recoveries (4) 36 2 — 34 Ending balance $ 4,780 $ 2,934 $ 2,311 $ 1,115 $ 11,140 Period end amount allocated to: Loans individually evaluated for impairment $ 41 $ 87 $ — $ — $ 128 Loans collectively evaluated for impairment 4,739 2,847 2,311 1,115 11,012 Ending balance $ 4,780 $ 2,934 $ 2,311 $ 1,115 $ 11,140 LOANS RECEIVABLE Loans individually evaluated for impairment $ 472 $ 248 $ — $ — $ 720 Loans collectively evaluated for impairment 446,119 218,681 152,175 — 816,975 Ending balance $ 446,591 $ 218,929 $ 152,175 $ — $ 817,695
Past Due Financing Receivables	The following tables provide information pertaining to the aging analysis of contractually past due loans and non-accrual loans at March 31, 2019 and December 31, 2018: March 31, 2019 30-59 60-89 Days Days 90 Days Total Total Past Past or More Past Loans Non- Due Due Past Due Due Current Receivable Accrual REAL ESTATE LOANS Commercial $ — $ — $ — $ — $ 208,607 $ 208,607 $ — Construction and development — — — — 219,229 219,229 — Home equity 5 — 186 191 40,523 40,714 191 One-to-four-family 1,466 — 1,512 2,978 258,890 261,868 1,902 Multi-family — — — — 102,997 102,997 — Total real estate loans 1,471 — 1,698 3,169 830,246 833,415 2,093 CONSUMER LOANS Indirect home improvement 244 152 95 491 174,301 174,792 381 Solar — 58 16 74 44,420 44,494 59 Marine — — — — 59,884 59,884 5 Other consumer 28 16 16 60 5,186 5,246 12 Total consumer loans 272 226 127 625 283,791 284,416 457 COMMERCIAL BUSINESS LOANS Commercial and industrial 80 — 431 511 136,814 137,325 431 Warehouse lending — — — — 41,914 41,914 — Total commercial business loans 80 — 431 511 178,728 179,239 431 Total loans $ 1,823 $ 226 $ 2,256 $ 4,305 $ 1,292,765 $ 1,297,070 $ 2,981 December 31, 2018 30-59 60-89 Days Days 90 Days Total Total Past Past or More Past Loans Non- Due Due Past Due Due Current Receivable Accrual REAL ESTATE LOANS Commercial $ — $ — $ — $ — $ 204,699 $ 204,699 $ — Construction and development — — — — 247,306 247,306 — Home equity 158 40 229 427 39,831 40,258 229 One-to-four-family 1,274 164 1,358 2,796 246,601 249,397 1,552 Multi-family — — — — 104,663 104,663 — Total real estate loans 1,432 204 1,587 3,223 843,100 846,323 1,781 CONSUMER LOANS Indirect home improvement 438 196 113 747 167,046 167,793 367 Solar 62 43 41 146 44,287 44,433 41 Marine 50 — — 50 57,772 57,822 18 Other consumer 69 24 11 104 5,321 5,425 2 Total consumer loans 619 263 165 1,047 274,426 275,473 428 COMMERCIAL BUSINESS LOANS Commercial and industrial — 431 — 431 138,255 138,686 1,685 Warehouse lending — — — — 65,756 65,756 — Total commercial business loans — 431 — 431 204,011 204,442 1,685 Total loans $ 2,051 $ 898 $ 1,752 $ 4,701 $ 1,321,537 $ 1,326,238 $ 3,894 There was one other consumer loan and two other consumer loans 90 days or more past due and still accruing interest of $5,000 and $11,000 at March 31, 2019 and at December 31, 2018, respectively.
Impaired Financing Receivables	The following tables provide additional information about our impaired loans that have been segregated to reflect loans for which an allowance for loan losses has been provided and loans for which no allowance was provided at March 31, 2019 and December 31, 2018: March 31, 2019 Unpaid Principal Recorded Related Balance Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 191 $ 191 $ — One-to-four-family 746 746 — Total real estate loans 937 937 — Commercial business loans 431 431 — 1,368 1,368 — WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,156 1,156 173 Consumer loans 457 457 160 1,613 1,613 333 Total $ 2,981 $ 2,981 $ 333 December 31, 2018 Unpaid Principal Recorded Related Balance Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 229 $ 229 $ — WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,552 1,552 125 Consumer loans 428 428 150 Commercial business loans 1,685 1,685 700 3,665 3,665 975 Total $ 3,894 $ 3,894 $ 975 The following table presents the average recorded investment in loans individually evaluated for impairment and the interest income recognized and received for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 March 31, 2018 Average Recorded Interest Income Average Recorded Interest Income Investment Recognized Investment Recognized WITH NO RELATED ALLOWANCE RECORDED Home equity $ 267 $ — $ 203 $ 2 One-to-four-family 830 15 — — Total real estate loans 1,097 15 203 2 Commercial business loans 431 — — — 1,528 15 203 2 WITH RELATED ALLOWANCE RECORDED One-to-four-family 1,156 — 271 2 Consumer loans 459 9 259 6 Commercial business loans 1,152 7 — — 2,767 16 530 8 Total $ 4,295 $ 31 $ 733 $ 10
Financing Receivable Credit Quality Indicators	The following tables summarize risk rated loan balances by category at the dates indicated: March 31, 2019 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 206,655 $ 1,952 $ — $ — $ — $ — $ 208,607 Construction and development 213,708 5,521 — — — — 219,229 Home equity 40,485 — 38 191 — — 40,714 One-to-four-family 259,697 206 63 1,902 — — 261,868 Multi-family 101,774 1,223 — — — — 102,997 Total real estate loans 822,319 8,902 101 2,093 — — 833,415 CONSUMER LOANS Indirect home improvement 174,411 — — 381 — — 174,792 Solar 44,435 — — 59 — — 44,494 Marine 59,879 — — 5 — — 59,884 Other consumer 5,227 — 7 12 — — 5,246 Total consumer loans 283,952 — 7 457 — — 284,416 COMMERCIAL BUSINESS LOANS Commercial and industrial 124,066 8,658 20 4,581 — — 137,325 Warehouse lending 41,914 — — — — — 41,914 Total commercial business loans 165,980 8,658 20 4,581 — — 179,239 Total loans receivable, gross $ 1,272,251 $ 17,560 $ 128 $ 7,131 $ — $ — $ 1,297,070 December 31, 2018 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 203,557 $ 1,142 $ — $ — $ — $ — $ 204,699 Construction and development 244,577 2,729 — — — — 247,306 Home equity 39,846 — 183 229 — — 40,258 One-to-four-family 247,575 207 63 1,552 — — 249,397 Multi-family 103,447 1,216 — — — — 104,663 Total real estate loans 839,002 5,294 246 1,781 — — 846,323 CONSUMER LOANS Indirect home improvement 167,426 — — 367 — — 167,793 Solar 44,392 — — 41 — — 44,433 Marine 57,804 — — 18 — — 57,822 Other consumer 5,415 — 8 2 — — 5,425 Total consumer loans 275,037 — 8 428 — — 275,473 COMMERCIAL BUSINESS LOANS Commercial and industrial 124,089 8,813 — 5,784 — — 138,686 Warehouse lending 65,756 — — — — — 65,756 Total commercial business loans 189,845 8,813 — 5,784 — — 204,442 Total loans receivable, gross $ 1,303,884 $ 14,107 $ 254 $ 7,993 $ — $ — $ 1,326,238

Servicing Rights (Tables)

Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Summary of servicing rights activity	The following table summarizes servicing rights activity for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 2018 Beginning balance $ 10,429 $ 6,795 Additions 844 1,138 Servicing rights amortized (639) (418) Impairment on servicing rights (23) — Ending balance $ 10,611 $ 7,515
Key economic assumptions and the sensitivity of the current fair value for single family mortgage servicing rights	Key economic assumptions and the sensitivity of the current fair value for single family MSR to immediate adverse changes in those assumptions at March 31, 2019 and December 31, 2018 were as follows: March 31, 2019 December 31, 2018 Aggregate portfolio principal balance $ 1,235,058 $ 1,186,858 Weighted average rate of note 4.3 % % At March 31, 2019 Base 0.5% Adverse Rate Change 1.0% Adverse Rate Change Conditional prepayment rate 13.5 % 18.8 % 26.2 % Fair value MSR $ 12,914 $ 10,916 $ 8,957 Percentage of MSR 1.0 % 0.9 % 0.7 % Discount rate 9.7 % 10.2 % 10.7 % Fair value MSR $ 12,914 $ 12,676 $ 12,446 Percentage of MSR 1.0 % 1.0 % 1.0 % At December 31, 2018 Base 0.5% Adverse Rate Change 1.0% Adverse Rate Change Conditional prepayment rate 8.8 % 11.6 % 17.7 % Fair value MSR $ 14,218 $ 12,723 $ 10,358 Percentage of MSR 1.2 % 1.1 % 0.9 % Discount rate 9.6 % 10.1 % 10.6 % Fair value MSR $ 14,218 $ 13,912 $ 13,617 Percentage of MSR 1.2 % 1.2 % 1.2 %
Mortgage servicing rights
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation assumptions used in determining the fair value of servicing rights	The following provides valuation assumptions used in determining the fair value of mortgage servicing rights (“MSR”) at the dates indicated: At March 31, At December 31, 2019 2018 Key assumptions: Weighted average discount rate 9.5 % 9.5 % Conditional prepayment rate (“CPR”) 13.5 % 9.4 % Weighted average life in years 6.1 7.7

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following tables summarize the Company’s derivative instruments at the dates indicated: March 31, 2019 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 41,486 $ 686 $ — Mandatory and best effort forward commitments with investors 17,530 — 96 Forward TBA mortgage-backed securities 64,500 — 301 TBA mortgage-backed securities forward sales paired off with investors 23,500 — 160 December 31, 2018 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 29,432 $ 503 $ — Mandatory and best effort forward commitments with investors 24,776 — 34 Forward TBA mortgage-backed securities 51,500 — 540 TBA mortgage-backed securities forward sales paired off with investors 6,500 — 64

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
LEASES
Summary of lease cost	The components of lease cost (included in occupancy expense) are as follows for the three months ended March 31, 2019: Three Months Ended March 31, 2019 Lease cost: Operating lease cost $ 308 Short-term lease cost 46 Total lease cost $ 354 The following table provides supplemental information related to operating leases: Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 334 Weighted average remaining lease term- operating leases 5.8 years Weighted average discount rate- operating leases 3.08 %
Summary of maturities of operating lease liabilities	Maturities of operating lease liabilities at March 31, 2019 for future periods are as follows: Remainder of 2019 $ 972 2020 1,082 2021 947 2022 841 2023 482 Thereafter 1,282 Total lease payments $ 5,606 Less imputed interest (630) Total $ 4,976

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Schedule of Other Real Estate Owned	The following table presents the activity related to OREO at and for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 2018 Beginning balance $ 689 $ — Additions 77 — Gross proceeds from sale of OREO (684) — Gain on sale of OREO 85 — Ending balance $ 167 $ —

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Schedule of Deposit Liabilities	Deposits are summarized as follows at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 (1)(2) 2018 (1)(2) Noninterest-bearing checking $ 228,067 $ 221,107 Interest-bearing checking 181,402 151,103 Savings 122,940 122,344 Money market 270,718 282,595 Certificates of deposit less than $100,000 (3) 261,664 243,193 Certificates of deposit of $100,000 through $250,000 160,899 154,095 Certificates of deposit of $250,000 and over (4) 78,342 86,357 Escrow accounts related to mortgages serviced 17,518 13,425 Total $ 1,321,550 $ 1,274,219 __________________________ (1) Includes $120.7 million of deposits at March 31, 2019 from the purchase of four retail bank branches from Bank of America, National Association on January 22, 2016 (“Branch Purchase”) and $120.0 million at December 31, 2018. (2) Includes $343.6 million and $321.1 million of deposits at March 31, 2019 and December 31, 2018, respectively, from the Anchor Acquisition. (3) Includes $129.7 million and $116.7 million of brokered deposits at March 31, 2019 and December 31, 2018, respectively. Time deposits that meet or exceed the FDIC insurance limit.
Schedule of Maturities of Time Deposits for Future Periods	Scheduled maturities of time deposits at March 31, 2019 for future periods ending are as follows: At March 31, 2019 Maturing in 2019 $ 249,727 Maturing in 2020 162,185 Maturing in 2021 48,513 Maturing in 2022 29,270 Maturing in 2023 9,441 Thereafter 1,769 Total $ 500,905
Schedule of Interest Expense by Deposit Category	Interest expense by deposit category for the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended March 31, 2019 2018 Interest-bearing checking $ 196 $ 67 Savings and money market 763 319 Certificates of deposit 2,751 858 Total $ 3,710 $ 1,244

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments to Extend Credit	The following table provides a summary of the Company’s commitments at March 31, 2019 and December 31, 2018: March 31, December 31, 2019 2018 COMMITMENTS TO EXTEND CREDIT REAL ESTATE LOANS Commercial $ 4,476 $ 5,836 Construction and development 62,129 76,889 One-to-four-family (includes locks for salable loans) 43,666 35,714 Home equity 40,801 41,204 Multi-family 507 515 Total real estate loans 151,579 160,158 CONSUMER LOANS 23,451 18,560 COMMERCIAL BUSINESS LOANS Commercial and industrial 75,869 72,880 Warehouse lending 50,086 44,243 Total commercial business loans 125,955 117,123 Total commitments to extend credit $ 300,985 $ 295,841

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule Of Available For Sale Securities Measured At Fair Value On A Recurring Basis	The following tables present securities available-for-sale measured at fair value on a recurring basis at the dates indicated: Securities Available-for-Sale Level 1 Level 2 Level 3 Total At March 31, 2019 U.S. agency securities $ — $ 13,045 $ — $ 13,045 Corporate securities — 8,540 — 8,540 Municipal bonds — 14,474 — 14,474 Mortgage-backed securities — 49,252 — 49,252 U.S. Small Business Administration securities — 14,472 — 14,472 Total $ — $ 99,783 $ — $ 99,783 Securities Available-for-Sale Level 1 Level 2 Level 3 Total At December 31, 2018 U.S. agency securities $ — $ 15,887 $ — $ 15,887 Corporate securities — 6,865 — 6,865 Municipal bonds — 14,194 — 14,194 Mortgage-backed securities — 44,836 — 44,836 U.S. Small Business Administration securities — 15,423 — 15,423 Total $ — $ 97,205 $ — $ 97,205
Fair Value, Mortgage Loans Held for Sale	The following table presents mortgage loans held for sale measured at fair value on a recurring basis at the dates indicated: Mortgage Loans Held for Sale Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ 45,591 $ — $ 45,591 December 31, 2018 $ — $ 51,195 $ — $ 51,195
Schedule of fair value of interest rate lock commitments	The following tables present the fair value of interest rate lock commitments with customers, individual forward sale commitments with investors, and paired off commitments with investors measured at their fair value on a recurring basis at the dates indicated: Interest Rate Lock Commitments with Customers Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 686 $ 686 December 31, 2018 $ — $ — $ 503 $ 503
Schedule of forward sale commitments with investors	The following tables present the fair value of interest rate lock commitments with customers, individual forward sale commitments with investors, and paired off commitments with investors measured at their fair value on a recurring basis at the dates indicated: Individual Forward Sale Commitments with Investors Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ (301) (96) $ (397) December 31, 2018 $ — $ (540) $ (34) $ (574)
Schedule of paired off commitments with investors	The following tables present the fair value of interest rate lock commitments with customers, individual forward sale commitments with investors, and paired off commitments with investors measured at their fair value on a recurring basis at the dates indicated: Paired Off Commitments with Investors Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ (160) $ — $ (160) December 31, 2018 $ — $ (64) $ — $ (64)
Schedule of impaired loans and other real estate owned	The following tables present impaired loans, OREO and servicing rights measured at fair value on a nonrecurring basis for which a nonrecurring change in fair value has been recorded during the reporting periods indicated. The amounts disclosed below represent the fair values at the time the nonrecurring fair value measurements were evaluated. Impaired Loans Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 2,981 $ 2,981 December 31, 2018 $ — $ — $ 3,894 $ 3,894 OREO Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 167 $ 167 December 31, 2018 $ — $ — $ 689 $ 689
Fair value reconciliation - Level 3 on recurring basis	The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the three months ended March 31, 2019 and 2018: Net change in fair value for gains/ Purchases (losses) relating to Beginning and Sales and Ending items held at end of Balance issuances settlements Balance at end of year 2019 Interest rate lock commitments with customers $ 503 $ 1,931 $ (1,748) $ 686 $ 183 Individual forward sale commitments with investors (34) (162) 100 (96) (62) 2018 Interest rate lock commitments with customers $ 726 $ 2,435 $ (2,346) $ 815 $ 89 Individual forward sale commitments with investors 51 573 (620) 4 (47)
Fair Value, by Balance Sheet Grouping	The following table provides estimated fair values of the Company’s financial instruments at March 31, 2019 and December 31, 2018, whether or not recognized at fair value on the Consolidated Balance Sheets: March 31, December 31, 2019 2018 Carrying Fair Carrying Fair Amount Value Amount Value Financial Assets Level 1 inputs: Cash and cash equivalents $ 63,074 $ 63,074 $ 32,779 $ 32,779 Certificates of deposit at other financial institutions 22,073 22,073 22,074 22,074 Level 2 inputs: Securities available-for-sale, at fair value 99,783 99,783 97,205 97,205 Loans held for sale, at fair value 45,591 45,591 51,195 51,195 FHLB stock, at cost 8,157 8,157 9,887 9,887 Accrued interest receivable 5,812 5,812 5,761 5,761 Level 3 inputs: Loans receivable, gross 1,297,070 1,302,247 1,326,238 1,320,341 Servicing rights, held at lower of cost or fair value 10,611 12,914 10,429 14,593 Fair value interest rate locks with customers 686 686 503 503 Financial Liabilities Level 2 inputs: Deposits 1,321,550 1,310,404 1,274,219 1,261,096 Borrowings 86,824 86,609 137,149 136,873 Subordinated note 9,870 10,242 9,865 10,242 Accrued interest payable 504 504 344 344 Paired off commitments with investors 160 160 64 64 Individual forward sale commitments with investors 301 301 540 540 Level 3 inputs: Individual forward sale commitments with investors 96 96 34 34
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation assumptions used in determining the fair value of servicing rights	OREO Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 167 $ 167 December 31, 2018 $ — $ — $ 689 $ 689 Servicing Rights Level 1 Level 2 Level 3 Total March 31, 2019 $ — $ — $ 12,914 $ 12,914 December 31, 2018 $ — $ — $ 14,593 $ 14,593 Quantitative Information about Level 3 Fair Value Measurements - Shown in the table below is the fair value of financial instruments measured under a Level 3 unobservable input on a recurring and nonrecurring basis at March 31, 2019: Level 3 Significant Range Weighted Fair Value Instruments Valuation Technique Unobservable Inputs (Weighted Average) Average RECURRING Interest rate lock commitments with customers Quoted market prices Pull-through expectations 80% - 99% 95.0 % Individual forward sale commitments with investors Quoted market prices Pull-through expectations 80% - 99% 95.0 % NONRECURRING Impaired loans Fair value of underlying collateral Discount applied to the obtained appraisal 0% - 50% 11.2 % OREO Fair value of collateral Discount applied to the obtained appraisal 0% - 75% 35.7 % Servicing rights Industry sources Pre-payment speeds 10% - 26% 13.5 %

Employee Benefits (Tables)

Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2019
Compensation and Retirement Disclosure [Abstract]
Schedule of Shares Under ESOP	Shares held by the ESOP at March 31, 2019 and 2018 were as follows (shown as actual): Balances Balances at March 31, 2019 at March 31, 2018 Allocated shares 176,809 153,049 Committed to be released shares 6,480 6,480 Unallocated shares 71,283 97,204 Total ESOP shares 254,572 256,733 Fair value of unallocated shares (in thousands) $ 3,530 $ 5,382

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	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, 2019 and 2018 (shown as actual): At or For the Three Months Ended March 31, Numerator: 2019 2018 Net income (in thousands) $ 5,192 $ 4,322 Denominator: Basic weighted average common shares outstanding 4,355,307 3,556,581 Dilutive shares 138,119 194,956 Diluted weighted average common shares outstanding 4,493,426 3,751,537 Basic earnings per share $ 1.19 $ 1.22 Diluted earnings per share $ 1.15 $ 1.15 Potentially dilutive weighted average share options that were not included in the computation of diluted earnings per share because to do so would be anti-dilutive 44,488 —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Awards	The following table presents a summary of the Company’s stock option awards during the three months ended March 31, 2019 (shown as actual): Weighted-Average Weighted- Remaining Average Contractual Term In Aggregate Shares Exercise Price Years Intrinsic Value Outstanding at January 1, 2019 290,104 $ 31.27 6.83 $ 4,940,803 Granted — — — — Less exercised 2,600 $ 16.89 — $ 92,131 Forfeited or expired — — — — Outstanding at March 31, 2019 287,504 $ 31.40 6.54 $ 6,298,259 Expected to vest, assuming a 0.31% annual forfeiture rate (1) 286,750 $ 31.33 6.53 $ 6,297,620 Exercisable at March 31, 2019 130,204 $ 16.89 4.98 $ 4,373,552 __________________________ (1) Forfeiture rate has been calculated and estimated to assume a forfeiture of 3.1% of the options forfeited over 10 years.
Summary of Nonvested Awards	The following table presents a summary of the Company’s nonvested awards during the three months ended March 31, 2019 (shown as actual): Weighted-Average Grant-Date Fair Value Nonvested Shares Shares Per Share Nonvested at January 1, 2019 43,421 $ 41.22 Granted — — Less vested 3,300 $ 21.03 Forfeited or expired — — Nonvested at March 31, 2019 40,121 $ 42.88

Regulatory Capital (Tables)

Regulatory Capital (Tables)	3 Months Ended
	Mar. 31, 2019
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following table compares the Bank’s actual capital amounts and ratios at March 31, 2019 and December 31, 2018 to their minimum regulatory capital requirements and well capitalized regulatory capital at those dates (dollars in thousands): To be Well Capitalized Under Prompt For Capital For Capital Adequacy Corrective Actual Adequacy Purposes with Capital Buffer Action Provisions Bank Only Amount Ratio Amount Ratio Amount Ratio Amount Ratio At March 31, 2019 Total risk-based capital (to risk-weighted assets) $ 193,032 14.73 % $ 104,832 8.00 % $ 137,592 10.50 % $ 131,040 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 180,902 13.81 % $ 78,624 6.00 % $ 111,384 8.50 % $ 104,832 8.00 % Tier 1 leverage capital (to average assets) $ 180,902 11.01 % $ 65,702 4.00 % $ — N/A $ 82,127 5.00 % CET 1 capital (to risk-weighted assets) $ 180,902 13.81 % $ 58,968 4.50 % $ 91,728 7.00 % $ 85,176 6.50 % At December 31, 2018 Total risk-based capital (to risk-weighted assets) $ 188,472 13.52 % $ 111,493 8.00 % $ 137,694 9.88 % $ 139,366 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 175,824 12.62 % $ 83,620 6.00 % $ 109,820 7.88 % $ 111,493 8.00 % Tier 1 leverage capital (to average assets) $ 175,824 10.67 % $ 65,884 4.00 % $ — N/A $ 82,355 5.00 % CET 1 capital (to risk-weighted assets) $ 175,824 12.62 % $ 62,715 4.50 % $ 88,846 6.38 % $ 90,588 6.50 %

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The tables below summarize the financial results for each segment based primarily on the number of FTEs and assets within each segment for the three months ended March 31, 2019 and 2018: At or For the Three Months Ended March 31, 2019 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 1,071 $ 16,618 $ 17,689 Provision for loan losses (59) (691) (750) Noninterest income 2,419 2,136 4,555 Noninterest expense (3,304) (11,493) (14,797) Income before provision for income taxes 127 6,570 6,697 Provision for income taxes (29) (1,476) (1,505) Net income $ 98 $ 5,094 $ 5,192 Total average assets at period end $ 239,287 $ 1,375,574 $ 1,614,861 FTEs 112 314 426 At or For the Three Months Ended March 31, 2018 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 715 $ 10,782 $ 11,497 Provision for loan losses 4 (354) (350) Noninterest income 3,766 1,258 5,024 Noninterest expense (4,056) (6,980) (11,036) Income before provision for income taxes 429 4,706 5,135 Provision for income taxes (68) (745) (813) Net income $ 361 $ 3,961 $ 4,322 Total average assets at period end $ 216,384 $ 800,334 $ 1,016,718 FTEs 116 213 329 ___________________________ Net interest income is the difference between interest earned on assets and the cost of liabilities to fund those assets. Interest earned includes actual interest earned on segment assets and, if the segment has excess liabilities, interest credits for providing funding to the other segment. The cost of liabilities includes interest expense on segment liabilities and, if the segment does not have enough liabilities to fund its assets, a funding charge based on the cost of assigned liabilities to fund segment assets.

Goodwill And Other Intangible_2

Goodwill And Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in other intangible assets	The following table summarizes the changes in the Company’s other intangible assets comprised solely of CDI for the year ended December 31, 2018, and the three months ended March 31, 2019. Other Intangible Assets Accumulated Gross CDI Amortization Net CDI Balance, December 31, 2017 $ 2,239 $ (922) $ 1,317 Amortization — (307) (307) Additions as a result of the Anchor Acquisition (1) 5,251 (44) 5,207 Balance, December 31, 2018 7,490 (1,273) 6,217 Amortization — (190) (190) Balance, March 31, 2019 $ 7,490 $ (1,463) $ 6,027
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Amortization expense for core deposit intangible is expected to be as follows at March 31, 2019: Remainder of 2019 570 2020 706 2021 691 2022 691 2023 691 Thereafter 2,678 Total $ 6,027

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)segmentitemOffice	Jan. 01, 2019USD ($)	Jan. 22, 2016item
Schedule of Accounting Policies [Line Items]
Number of bank branches | item			4
Number of business segments | segment	2
Operating lease, renewal term		5 years
ROU assets | $	$ 4,849
Operating lease liabilities | $	$ 4,976
ASU No. 2016 | Restatement
Schedule of Accounting Policies [Line Items]
ROU assets | $		$ 4,800
Operating lease liabilities | $		$ 5,000
Impact on balance sheet (as a percent)	0.30%
Minimum
Schedule of Accounting Policies [Line Items]
Lease term		3 months
Maximum
Schedule of Accounting Policies [Line Items]
Lease term		8 years
Puget Sound [Member]
Schedule of Accounting Policies [Line Items]
Number of bank branches | item	21
Number of administrative offices that accept deposits | Office	1
Number of loan production offices | item	8
Tri-Cities, Washington [Member]
Schedule of Accounting Policies [Line Items]
Number of loan production offices | item	1

Business Combination - Narrativ

Business Combination - Narrative (Details) $ in Thousands	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 22, 2016item
Business Acquisition [Line Items]
Number of bank branches | item			4
Goodwill	$ 2,312	$ 2,312
Bank of America
Business Acquisition [Line Items]
Deposits	$ 120,700	$ 120,000

Business Combination - Estimate

Business Combination - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 15, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Noninterest-bearing accounts		$ 245,585	$ 234,532
Interest-bearing accounts		1,075,965	1,039,687
Bank of America
Business Acquisition [Line Items]
Total deposits		120,700	120,000
Anchor Bancorp
Business Acquisition [Line Items]
Cash and cash equivalents	$ 54,558
Securities available-for-sale	19,555
Loans receivable, net	356,275
Premises and equipment, net	11,765
Other real estate owned ("OREO")	689
Deferred tax asset	739
Mortgage servicing rights	782
Core deposit intangible	5,251
Other assets	25,249
Total assets acquired	474,863
Total deposits	356,811	$ 343,600	$ 321,100
Borrowings	36,718
Other liabilities	9,349
Total liabilities assumed	$ 402,878
Pre-tax discount of time deposits to core deposits (as a percent)	0.65%
Business Acquisition, Share Price	$ 46.54
Common stock outstanding	725,518
Acquired Book Value | Anchor Bancorp
Business Acquisition [Line Items]
Cash and cash equivalents	$ 54,558
Securities available-for-sale	19,609
Loans receivable, net	361,596
Premises and equipment, net	8,411
Other real estate owned ("OREO")	689
Deferred tax asset	4,097
Mortgage servicing rights	218
Other assets	25,231
Total assets acquired	474,409
Total deposits	357,863
Borrowings	37,000
Other liabilities	9,286
Total liabilities assumed	404,149
Fair Value Adjustments | Anchor Bancorp
Business Acquisition [Line Items]
Securities available-for-sale	(54)
Loans receivable, net	(5,321)
Premises and equipment, net	3,354
Deferred tax asset	(3,358)
Mortgage servicing rights	564
Core deposit intangible	5,251
Other assets	18
Total assets acquired	454
Total deposits	(1,052)
Borrowings	(282)
Other liabilities	63
Total liabilities assumed	(1,271)
Carrying Amount | Anchor Bancorp
Business Acquisition [Line Items]
Cash and cash equivalents	54,558
Securities available-for-sale	19,555
Loans receivable, net	356,275
Premises and equipment, net	11,765
Other real estate owned ("OREO")	689
Deferred tax asset	739
Mortgage servicing rights	782
Core deposit intangible	5,251
Other assets	25,249
Total assets acquired	474,863
Total deposits	356,811
Borrowings	36,718
Other liabilities	9,349
Total liabilities assumed	$ 402,878
Interest Income [Member] | Anchor Bancorp
Business Acquisition [Line Items]
Estimated amortization period	60 months
Interest Expense [Member] | Anchor Bancorp
Business Acquisition [Line Items]
Estimated amortization period	10 years

Business Combination - Amount R

Business Combination - Amount Recognized for Assets Acquired and Liabilities Assumed (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 15, 2018	Mar. 31, 2019	Dec. 31, 2018
Bank of America
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Deposits		$ 120,700	$ 120,000
Anchor Bancorp
Business Acquisition [Line Items]
Fair value of FS Bancorp common stock at $46.54 (1) per share for 725,518 shares	$ 33,766
Cash paid	30,805
Total purchase price	64,571
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents	54,558
Securities available-for-sale	19,555
Loans receivable, net	356,275
Premises and equipment, net	11,765
OREO	689
Deferred tax asset	739
Mortgage servicing rights	782
Intangible assets - CDI	5,251
Other assets	25,249
Total assets and identifiable intangible assets acquired	474,863
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Deposits	356,811	$ 343,600	$ 321,100
Borrowings	36,718
Other liabilities	9,349
Total liabilities assumed	402,878
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Total fair value of identifiable net assets	71,985
Bargain purchase gain	$ (7,414)
Number of shares received	0.291
Consideration received by anchor shareholder in cash for each share	$ 12.40

Securities Available-for-sale -

Securities Available-for-sale - Available-for-sale securities reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	$ 100,339	$ 99,089
Unrealized gains	364	138
Unrealized losses	(920)	(2,022)
Securities available-for-sale, at fair value	99,783	97,205
U.S. agency securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	13,045	16,052
Unrealized gains	42	32
Unrealized losses	(42)	(197)
Securities available-for-sale, at fair value	13,045	15,887
Corporate securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	8,556	7,074
Unrealized gains	21	0
Unrealized losses	(37)	(209)
Securities available-for-sale, at fair value	8,540	6,865
Municipal bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	14,412	14,446
Unrealized gains	178	23
Unrealized losses	(116)	(275)
Securities available-for-sale, at fair value	14,474	14,194
Mortgage-backed securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	49,632	45,827
Unrealized gains	123	83
Unrealized losses	(503)	(1,074)
Securities available-for-sale, at fair value	49,252	44,836
U.S. Small Business Administration securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	14,694	15,690
Unrealized gains	0	0
Unrealized losses	(222)	(267)
Securities available-for-sale, at fair value	$ 14,472	$ 15,423

Securities Available-for-sale_2

Securities Available-for-sale - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)security	Dec. 31, 2018USD ($)security
Investments, Debt and Equity Securities [Abstract]
Investments with unrealized losses of less than one year | security	4	14
Investments with unrealized losses of more than one year | security	41	48
Number of securities pledged and held at FHLB | security	11	11
Pledged securities for FHLB	$ 13,900,000	$ 13,700,000
Public deposits	11,500,000	19,900,000
Collateral requirement	4,400,000	8,400,000
Other than temporary impairment losses, investments	$ 0	$ 0

Securities Available-for-sale_3

Securities Available-for-sale - Investments with Unrealized Losses Policy (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	$ 4,791	$ 17,315
Unrealized loss position, Fair Value, 12 Months or Longer	58,452	65,501
Unrealized loss position, Fair Value	63,243	82,816
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	(12)	(123)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(908)	(1,899)
Unrealized losses	(920)	(2,022)
U.S. agency securities
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	0	6,018
Unrealized loss position, Fair Value, 12 Months or Longer	4,952	4,822
Unrealized loss position, Fair Value	4,952	10,840
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	0	(25)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(42)	(172)
Unrealized losses	(42)	(197)
Corporate securities
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	2,486	975
Unrealized loss position, Fair Value, 12 Months or Longer	5,033	5,890
Unrealized loss position, Fair Value	7,519	6,865
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	(6)	(25)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(31)	(184)
Unrealized losses	(37)	(209)
Municipal bonds
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	0	2,098
Unrealized loss position, Fair Value, 12 Months or Longer	5,082	8,787
Unrealized loss position, Fair Value	5,082	10,885
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	0	(22)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(116)	(253)
Unrealized losses	(116)	(275)
Mortgage-backed securities
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	2,305	6,266
Unrealized loss position, Fair Value, 12 Months or Longer	28,913	32,537
Unrealized loss position, Fair Value	31,218	38,803
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	(6)	(40)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(497)	(1,034)
Unrealized losses	(503)	(1,074)
U.S. Small Business Administration securities
Fair Value
Unrealized loss position, Fair Value, Less than 12 Months	0	1,958
Unrealized loss position, Fair Value, 12 Months or Longer	14,472	13,465
Unrealized loss position, Fair Value	14,472	15,423
Unrealized Losses
Unrealized loss position, Unrealized losses, Less than 12 Months	0	(11)
Unrealized loss position, Unrealized losses, 12 Months or Longer	(222)	(256)
Unrealized losses	$ (222)	$ (267)

Securities Available-for-sale_4

Securities Available-for-sale - Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Total	$ 100,339	$ 99,089
Fair Value
Total	99,783	97,205
U.S. agency securities
Amortized Cost
Due after one year through five years	1,041	1,043
Due after five years through ten years	7,006	10,011
Due after ten years	4,998	4,998
Subtotal	13,045	16,052
Total	13,045	16,052
Fair Value
Due after one year through five years	1,048	1,040
Due after five years through ten years	7,011	9,941
Due after ten years	4,986	4,906
Subtotal	13,045	15,887
Total	13,045	15,887
Corporate securities
Amortized Cost
Due after one year through five years	7,064	6,077
Due after five years through ten years	1,492	997
Subtotal	8,556	7,074
Total	8,556	7,074
Fair Value
Due after one year through five years	7,048	5,947
Due after five years through ten years	1,492	918
Subtotal	8,540	6,865
Total	8,540	6,865
Municipal bonds
Amortized Cost
Due after one year through five years	2,659	2,659
Due after five years through ten years	2,599	2,610
Due after ten years	9,154	9,177
Subtotal	14,412	14,446
Total	14,412	14,446
Fair Value
Due after one year through five years	2,619	2,570
Due after five years through ten years	2,661	2,592
Due after ten years	9,194	9,032
Subtotal	14,474	14,194
Total	14,474	14,194
Mortgage-backed securities
Amortized Cost
Mortgage-backed securities	49,632	45,827
Total	49,632	45,827
Fair Value
Mortgage-backed securities	49,252	44,836
Total	49,252	44,836
Federal National Mortgage Association ("FNMA")
Amortized Cost
Mortgage-backed securities	31,691	30,554
Fair Value
Mortgage-backed securities	31,571	30,026
Federal Home Loan Mortgage Corporation ("FHLMC")
Amortized Cost
Mortgage-backed securities	10,008	10,301
Fair Value
Mortgage-backed securities	9,812	9,961
Government National Mortgage Association ("GNMA")
Amortized Cost
Mortgage-backed securities	7,933	4,972
Fair Value
Mortgage-backed securities	7,869	4,849
U.S. Small Business Administration securities
Amortized Cost
Due after one year through five years	862	0
Due after five years through ten years	12,061	13,828
Due after ten years	1,771	1,862
Subtotal	14,694	15,690
Total	14,694	15,690
Fair Value
Due after one year through five years	841	0
Due after five years through ten years	11,884	13,581
Due after ten years	1,747	1,842
Subtotal	14,472	15,423
Total	$ 14,472	$ 15,423

Securities Available-for-sale_5

Securities Available-for-sale - Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Gross Gains		$ 113
Gross (Losses)		0
Proceeds	$ 0	$ 5,305

Loans Receivable and Allowanc_3

Loans Receivable and Allowance For Loan Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,297,070	$ 1,326,238
Allowance for loan losses	(11,845)	(12,349)
Deferred costs and fees, net	(2,710)	(2,907)
Premiums on purchased loans	1,408	1,537
Loans receivable, net	1,283,923	1,312,519
REAL ESTATE LOANS | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	833,415	846,323
REAL ESTATE LOANS | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	208,607	204,699
REAL ESTATE LOANS | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	219,229	247,306
REAL ESTATE LOANS | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,714	40,258
REAL ESTATE LOANS | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	261,868	249,397
REAL ESTATE LOANS | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	102,997	104,663
CONSUMER LOANS | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	284,416	275,473
CONSUMER LOANS | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	174,792	167,793
CONSUMER LOANS | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,494	44,433
CONSUMER LOANS | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	59,884	57,822
CONSUMER LOANS | Consumer Loans Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,246	5,425
COMMERCIAL BUSINESS LOANS | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	179,239	204,442
COMMERCIAL BUSINESS LOANS | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	137,325	138,686
COMMERCIAL BUSINESS LOANS | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 41,914	$ 65,756

Loans Receivable and Allowanc_4

Loans Receivable and Allowance For Loan Losses - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)divisionsegmentitemOffice
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan production offices | Office	1
Number of loan portfolio segments | segment	3
Number of warehouse lending divisions | division	2
Loans that qualify as collateral for FHLM advances	$ 589.5
Loans that qualify as collateral for Federal Reserve Bank lines of credit	$ 274.8
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of units in real estate property | item	5

Loans Receivable and Allowanc_5

Loans Receivable and Allowance For Loan Losses - Allowance for Loan Losses by Loan Categories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
ALLOWANCE FOR LOAN LOSSES
Beginning balance	$ 12,349	$ 10,756
Provision for loan loss	750	350
Charge-offs	(1,402)	(232)
Recoveries	148	266
Net recoveries (charge-offs)	(1,254)	34
Loans individually evaluated for impairment	333	128
Loans collectively evaluated for impairment	11,512	11,012
Ending balance	11,845	11,140
LOANS RECEIVABLE
Loans individually evaluated for impairment	2,044	720
Loans collectively evaluated for impairment	1,295,026	816,975
Total loans receivable	1,297,070	817,695	$ 1,326,238
REAL ESTATE LOANS.
ALLOWANCE FOR LOAN LOSSES
Beginning balance	5,761	4,770
Provision for loan loss	24	14
Charge-offs	0	(4)
Recoveries	0
Net recoveries (charge-offs)	0	(4)
Loans individually evaluated for impairment	173	41
Loans collectively evaluated for impairment	5,612	4,739
Ending balance	5,785	4,780
LOANS RECEIVABLE
Loans individually evaluated for impairment	1,156	472
Loans collectively evaluated for impairment	832,259	446,119
Total loans receivable	833,415	446,591	846,323
CONSUMER LOANS.
ALLOWANCE FOR LOAN LOSSES
Beginning balance	3,351	2,814
Provision for loan loss	114	84
Charge-offs	(250)	(228)
Recoveries	148	264
Net recoveries (charge-offs)	(102)	36
Loans individually evaluated for impairment	160	87
Loans collectively evaluated for impairment	3,203	2,847
Ending balance	3,363	2,934
LOANS RECEIVABLE
Loans individually evaluated for impairment	457	248
Loans collectively evaluated for impairment	283,959	218,681
Total loans receivable	284,416	218,929	275,473
COMMERCIAL BUSINESS LOANS.
ALLOWANCE FOR LOAN LOSSES
Beginning balance	3,191	2,014
Provision for loan loss	691	295
Charge-offs	(1,152)
Recoveries	0	2
Net recoveries (charge-offs)	(1,152)	2
Loans individually evaluated for impairment	0
Loans collectively evaluated for impairment	2,730	2,311
Ending balance	2,730	2,311
LOANS RECEIVABLE
Loans individually evaluated for impairment	431
Loans collectively evaluated for impairment	178,808	152,175
Total loans receivable	179,239	152,175	$ 204,442
Unallocated Financing Receivables [Member]
ALLOWANCE FOR LOAN LOSSES
Beginning balance	46	1,158
Provision for loan loss	(79)	(43)
Charge-offs	0
Recoveries	0
Net recoveries (charge-offs)	0
Loans individually evaluated for impairment	0
Loans collectively evaluated for impairment	(33)	1,115
Ending balance	(33)	$ 1,115
LOANS RECEIVABLE
Loans individually evaluated for impairment	0
Loans collectively evaluated for impairment	0
Total loans receivable	$ 0

Loans Receivable and Allowanc_6

Loans Receivable and Allowance For Loan Losses - Aging Analysis of Past Due Loans) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan	Mar. 31, 2018USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 4,305	$ 4,701
Current	1,292,765	1,321,537
Total loans receivable	1,297,070	1,326,238	$ 817,695
COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	511	431
Current	178,728	204,011
Total loans receivable	179,239	204,442	152,175
Home equity.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	191	427
Current	40,523	39,831
Total loans receivable	40,714	40,258
Total real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,169	3,223
Current	830,246	843,100
Total loans receivable	833,415	846,323
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	208,607	204,699
Total loans receivable	208,607	204,699
Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	219,229	247,306
Total loans receivable	219,229	247,306
One-to-four-family (1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,978	2,796
Current	258,890	246,601
Total loans receivable	261,868	249,397
Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	102,997	104,663
Total loans receivable	102,997	104,663
REAL ESTATE LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans receivable	833,415	846,323	446,591
Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	491	747
Current	174,301	167,046
Total loans receivable	174,792	167,793
Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	74	146
Current	44,420	44,287
Total loans receivable	44,494	44,433
CONSUMER LOANS
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60	104
Current	5,186	5,321
Total loans receivable	5,246	5,425
Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	50
Current	59,884	57,772
Total loans receivable	59,884	57,822
CONSUMER LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	625	1,047
Current	283,791	274,426
Total loans receivable	284,416	275,473	$ 218,929
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	511	431
Current	136,814	138,255
Total loans receivable	137,325	138,686
Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	41,914	65,756
Total loans receivable	41,914	65,756
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,823	2,051
30-59 Days Past Due | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80	0
30-59 Days Past Due | Home equity.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5	158
30-59 Days Past Due | Total real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,471	1,432
30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30-59 Days Past Due | Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30-59 Days Past Due | One-to-four-family (1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,466	1,274
30-59 Days Past Due | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30-59 Days Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	244	438
30-59 Days Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	62
30-59 Days Past Due | CONSUMER LOANS
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	69
30-59 Days Past Due | Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	50
30-59 Days Past Due | CONSUMER LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	272	619
30-59 Days Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80	0
30-59 Days Past Due | Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	226	898
60-89 Days Past Due | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	431
60-89 Days Past Due | Home equity.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	40
60-89 Days Past Due | Total real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	204
60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | One-to-four-family (1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	164
60-89 Days Past Due | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	152	196
60-89 Days Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	58	43
60-89 Days Past Due | CONSUMER LOANS
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16	24
60-89 Days Past Due | Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | CONSUMER LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	226	263
60-89 Days Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	431
60-89 Days Past Due | Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,256	1,752
90 Days or More Past Due | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	0
90 Days or More Past Due | Home equity.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	186	229
90 Days or More Past Due | Total real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,698	1,587
90 Days or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or More Past Due | Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or More Past Due | One-to-four-family (1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,512	1,358
90 Days or More Past Due | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or More Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	95	113
90 Days or More Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16	41
90 Days or More Past Due | CONSUMER LOANS
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16	11
90 Days or More Past Due | Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or More Past Due | CONSUMER LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	127	165
90 Days or More Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	0
90 Days or More Past Due | Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,981	3,894
Non-Accrual | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	1,685
Non-Accrual | Home equity.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	191	229
Non-Accrual | Total real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,093	1,781
Non-Accrual | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual | Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual | One-to-four-family (1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,902	1,552
Non-Accrual | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	381	367
Non-Accrual | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	59	41
Non-Accrual | CONSUMER LOANS
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12	2
Non-Accrual | Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5	18
Non-Accrual | CONSUMER LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	457	428
Non-Accrual | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	1,685
Non-Accrual | Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
CONSUMER LOANS | 90 Days or More Past Due | Consumer Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 5	$ 11
Number Of Loans Accruing Interest | loan	0	0

Loans Receivable and Allowanc_7

Loans Receivable and Allowance For Loan Losses - Financing Receivables, Related Allowance Recorded and No Related Allowance Recorder (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	$ 1,368
Unpaid Principal Balance, with related allowance recorded	1,613		$ 3,665
Impaired Financing Receivable, Unpaid Principal Balance, Total	2,981		3,894
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	1,368
Recorded Investment, with related allowance recorded	1,613		3,665
Recorded Investment	2,981		3,894
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with no related allowance recorded	0
Related Allowance, with related allowance recorded	333		975
Related Allowance	333		975
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	1,528	$ 203
Average Recorded Investment, with related allowance recorded	2,767	530
Impaired Financing Receivable, Average Recorded Investment	4,295	733
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with no related allowance recorded	15	2
Interest Income Recognized, with related allowance recorded	16	8
Interest Income Recognized	31	10
Home equity
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	191		229
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	191		229
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with no related allowance recorded	0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	267	203
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with no related allowance recorded	0	2
One-to-four-family (1)
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	746
Unpaid Principal Balance, with related allowance recorded	1,156		1,552
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	746
Recorded Investment, with related allowance recorded	1,156		1,552
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with no related allowance recorded	0
Related Allowance, with related allowance recorded	173		125
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	830	0
Average Recorded Investment, with related allowance recorded	1,156	271
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with no related allowance recorded	15	0
Interest Income Recognized, with related allowance recorded	0	2
CONSUMER LOANS.
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with related allowance recorded	457		428
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with related allowance recorded	457		428
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with related allowance recorded	160		150
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with related allowance recorded	459	259
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with related allowance recorded	9	6
COMMERCIAL BUSINESS LOANS.
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	431
Unpaid Principal Balance, with related allowance recorded			1,685
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	431
Recorded Investment, with related allowance recorded			1,685
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with no related allowance recorded	0
Related Allowance, with related allowance recorded			$ 700
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	431	0
Average Recorded Investment, with related allowance recorded	1,152	0
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with no related allowance recorded	0	0
Interest Income Recognized, with related allowance recorded	7	0
Total real estate loans
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	937
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	937
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with no related allowance recorded	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	1,097	203
Impaired Financing Receivable, Interest Income [Abstract]
Interest Income Recognized, with no related allowance recorded	$ 15	$ 2

Loans Receivable and Allowanc_8

Loans Receivable and Allowance For Loan Losses - Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,297,070	$ 1,326,238	$ 817,695
REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	833,415	846,323	446,591
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	208,607	204,699
Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	219,229	247,306
Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,714	40,258
One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	261,868	249,397
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	102,997	104,663
CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	284,416	275,473	218,929
Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	174,792	167,793
Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,494	44,433
Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	59,884	57,822
CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,246	5,425
COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	179,239	204,442	$ 152,175
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	137,325	138,686
Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,914	65,756
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,272,251	1,303,884
Pass | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	822,319	839,002
Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	206,655	203,557
Pass | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	213,708	244,577
Pass | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,485	39,846
Pass | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	259,697	247,575
Pass | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,774	103,447
Pass | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	283,952	275,037
Pass | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	174,411	167,426
Pass | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,435	44,392
Pass | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	59,879	57,804
Pass | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,227	5,415
Pass | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	165,980	189,845
Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,066	124,089
Pass | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,914	65,756
Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,560	14,107
Watch | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,902	5,294
Watch | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,952	1,142
Watch | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,521	2,729
Watch | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	206	207
Watch | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,223	1,216
Watch | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Watch | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,658	8,813
Watch | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,658	8,813
Watch | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	128	254
Special Mention | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	101	246
Special Mention | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	38	183
Special Mention | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	63	63
Special Mention | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	7	8
Special Mention | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	7	8
Special Mention | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	20	0
Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	20	0
Special Mention | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,131	7,993
Substandard | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,093	1,781
Substandard | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	191	229
Substandard | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,902	1,552
Substandard | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	457	428
Substandard | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	381	367
Substandard | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	59	41
Substandard | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	5	18
Substandard | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	12	2
Substandard | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,581	5,784
Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,581	5,784
Substandard | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | REAL ESTATE LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Home equity.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | One-to-four-family (1)
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | CONSUMER LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 0

Servicing Rights - Narrative (D

Servicing Rights - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractually specified servicing fees, late fees, and other ancillary fees	$ 802,000	$ 536,000
Mortgage, commercial and consumer servicing rights
Off-balance Sheet Risks, Disclosure Information [Line Items]
The unpaid principal balances of mortgage loans serviced	1,240,000,000		$ 1,190,000,000
Mortgage servicing rights
Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair market value of servicing rights' assets	$ 12,900,000		$ 14,600,000

Servicing Rights - Servicing Ri

Servicing Rights - Servicing Rights (Details) - Mortgage servicing rights - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 10,429	$ 6,795
Additions	844	1,138
Servicing rights amortized	(639)	(418)
Impairment on servicing rights	(23)	0
Ending balance	$ 10,611	$ 7,515

Servicing Rights - Valuation As

Servicing Rights - Valuation Assumptions (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Off-balance Sheet Risks, Disclosure Information [Line Items]
Weighted average discount rate	9.50%	9.50%
Conditional prepayment rate ("CPR")	13.50%	9.40%
Weighted average life in years	6 years 1 month 6 days	7 years 8 months 12 days
Mortgage, commercial and consumer servicing rights
Off-balance Sheet Risks, Disclosure Information [Line Items]
Weighted average discount rate	9.70%		9.60%
Conditional prepayment rate ("CPR")	13.50%		8.80%

Servicing Rights - Changes in V

Servicing Rights - Changes in Valuation Assumptions (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Off-balance Sheet Risks, Disclosure Information [Line Items]
Basis Points Drop in Note Rate, Assumption One	0.50%		0.50%
Basis Points Drop in Note Rate, Assumption Two	1.00%		1.00%
Conditional prepayment rate	13.50%	9.40%
Discount rate	9.50%	9.50%
Mortgage, commercial and consumer servicing rights
Off-balance Sheet Risks, Disclosure Information [Line Items]
Aggregate portfolio principal balance	$ 1,235,058		$ 1,186,858
Weighted average rate of note	4.30%		4.30%
Conditional prepayment rate	13.50%		8.80%
Conditional prepayment rate, 0.5% Adverse Change	18.80%		11.60%
Conditional prepayment rate, 1.0% Adverse Change	26.20%		17.70%
Fair value MSR	$ 12,914		$ 14,218
Fair value MSR, 0.5% Adverse Change	10,916		12,723
Fair value of MSR, 1.0% Adverse Change	$ 8,957		$ 10,358
Percentage of MSR	1.00%		1.20%
Percentage of MSR, 0.5% Adverse Change	0.90%		1.10%
Percentage of MSR, 1.0% Adverse Change	0.70%		0.90%
Discount rate	9.70%		9.60%
Discount rate, 0.5% Adverse Change	10.20%		10.10%
Discount rate, 1.0% Adverse Change	10.70%		10.60%
Fair value MSR, 0.5% Adverse Change	$ 12,676		$ 13,912
Fair value MSR, 1.0% Adverse Change	$ 12,446		$ 13,617
Percentage of MSR, 0.5% Adverse Change	1.00%		1.20%
Percentage of MSR, 1.0% Adverse Change	1.00%		1.20%

Derivatives (Details)

Derivatives (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative [Line Items]
Margin collateral	$ 460,000		$ 460,000
Derivative instruments, gain (loss) on sale of loans	299,000	$ 81,000
Not Designated as Hedging Instrument | Fallout adjusted interest rate lock commitments with customers
Derivative [Line Items]
Notional	41,486,000		29,432,000
Asset	686,000		503,000
Liability	0		0
Not Designated as Hedging Instrument | Mandatory and best effort forward commitments with investors
Derivative [Line Items]
Notional	17,530,000		24,776,000
Asset	0		0
Liability	96,000		34,000
Not Designated as Hedging Instrument | Mortgage-backed securities
Derivative [Line Items]
Notional	64,500,000		51,500,000
Asset	0		0
Liability	301,000		540,000
Not Designated as Hedging Instrument | TBA mortgage-backed securities forward sales paired off with investors
Derivative [Line Items]
Notional	23,500,000		6,500,000
Asset	0		0
Liability	$ 160,000		$ 64,000

Leases (Details)

Leases (Details) $ in Millions	Jan. 01, 2019USD ($)
Lessee, Lease, Description [Line Items]
ROU assets obtained in exchange for operating lease obligations	$ 5.2
Options to extend	true
Renewal term	5 years
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	3 months
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	8 years

Leases - Components of lease co

Leases - Components of lease cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Lease cost:
Operating lease cost	$ 308
Short-term lease cost	46
Total lease cost	354
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 334
Weighted average remaining lease term- operating leases	5 years 9 months 18 days
Weighted average discount rate- operating leases	3.08%

Leases - Maturities of operatin

Leases - Maturities of operating lease liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Maturities of operating lease liabilities
Remainder of 2019	$ 972
2020	1,082
2021	947
2022	841
2023	482
Thereafter	1,282
Total lease payments	5,606
Less imputed interest	(630)
Operating lease liabilities	$ 4,976

Other Real Estate Owned - Activ

Other Real Estate Owned - Activity related to OREO (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Other Real Estate [Roll Forward]
Beginning balance	$ 689
Capitalized costs	77
Gross proceeds from sale of OREO	(684)
Gain on sale of OREO	85
Ending balance	$ 167

Other Real Estate Owned - Narra

Other Real Estate Owned - Narrative (Details)	3 Months Ended
	Mar. 31, 2019USD ($)
Banking and Thrift [Abstract]
OREO Properties acquired	$ 167,000
Other real estate owned holding costs (recovery)	4,000
Mortgage loans in process of foreclosure	$ 442,000

Deposits - Deposit Liabilities

Deposits - Deposit Liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Nov. 15, 2018USD ($)	Jan. 22, 2016item
Accounts, Notes, Loans and Financing Receivable [Line Items]
Noninterest-bearing checking	$ 228,067	$ 221,107
Interest-bearing checking	181,402	151,103
Savings	122,940	122,344
Money market (4)	270,718	282,595
Certificates of deposit less than $100,000	261,664	243,193
Certificates of deposit of $100,000 through $250,000	160,899	154,095
Certificates of deposit of $250,000 and over	78,342	86,357
Escrow accounts related to mortgages serviced	17,518	13,425
Total deposits	1,321,550	1,274,219
Interest-bearing Domestic Deposit, Brokered	129,700	116,700
Federal Reserve Bank required deposit reserves	24,500	17,400
Number of Bank Branches | item				4
Anchor Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remaining Branch Purchase Deposits	343,600	321,100	$ 356,811
Bank of America
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remaining Branch Purchase Deposits	$ 120,700	$ 120,000

Deposits - Maturities of Time D

Deposits - Maturities of Time Deposits for Future Periods (Details) $ in Thousands	Mar. 31, 2019USD ($)
Banking and Thrift [Abstract]
Maturing in 2019	$ 249,727
Maturing in 2020	162,185
Maturing in 2021	48,513
Maturing in 2022	29,270
Maturing in 2023	9,441
Thereafter	1,769
Total	$ 500,905

Deposits - Interest Expense by

Deposits - Interest Expense by Deposit Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Banking and Thrift [Abstract]
Interest-bearing checking	$ 196	$ 67
Savings and money market	763	319
Certificates of deposit	2,751	858
Total	$ 3,710	$ 1,244

Commitments and Contingencies -

Commitments and Contingencies - Commitment (Details) - Commitments to Extend Credit - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	$ 300,985	$ 295,841
REAL ESTATE LOANS.
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	151,579	160,158
Commercial
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	4,476	5,836
Construction and development
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	62,129	76,889
One-to-four-family (1)
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	43,666	35,714
Home equity.
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	40,801	41,204
Commercial/Multi-family
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	507	515
CONSUMER LOANS
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	23,451	18,560
COMMERCIAL BUSINESS LOANS.
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	125,955	117,123
Commercial and industrial
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	75,869	72,880
Warehouse lending
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	$ 50,086	$ 44,243

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2008shares	Mar. 31, 2019USD ($)action$ / shares	Dec. 31, 2018USD ($)$ / shares
Loss Contingencies [Line Items]
Amount of loans sold to FHLB		$ 68,200,000
Federal Home Loan Bank, First Loss Account Established		776,000
Bank recourse obligation		$ 524,000
Bank recourse obligation, percentage of loans outstanding		0.77%
Reserve as a percentage of outstanding CE		10.00%
Reserve for loans sold		$ 227,000
Outstanding Delinquencies On Loans Sold to Federal Home Loan Bank		$ 0	$ 0
Severance agreement, period of base compensation disbursed as lump sum payment (in months)		24 months
Change of control agreement, notice required to cancel agreement (in months)		24 months
Change of control agreement, executive payment, period following change in control (in months)		12 months
Number of shares received in an IPO | shares	7,158
Common stock, conversion ratio	1.6298
Carrying value of stock		$ 0
Pending material legal actions | action		0
Visa, Inc.
Loss Contingencies [Line Items]
Market value of stock (in dollars per share) | $ / shares		$ 156.19	$ 131.94
Maximum
Loss Contingencies [Line Items]
Change of control agreement, executive payment, period prior to change in control (in months)		6 months
Change of control agreement, period of base compensation disbursed as lump sum payment (in months)		12 months
Commitments to Extend Credit
Loss Contingencies [Line Items]
Reserve for estimated losses		$ 285,000	$ 299,000
Guarantee on loans sold
Loss Contingencies [Line Items]
Reserve for estimated losses		$ 1,000,000	$ 1,000,000

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Available for Sale Securities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 99,783	$ 97,205
U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	13,045	15,887
Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	8,540	6,865
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	14,474	14,194
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	49,252	44,836
U.S. Small Business Administration securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	14,472	15,423
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 1 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 1 | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 1 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 1 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 1 | U.S. Small Business Administration securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	99,783	97,205
Level 2 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	13,045	15,887
Level 2 | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	8,540	6,865
Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	14,474	14,194
Level 2 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	49,252	44,836
Level 2 | U.S. Small Business Administration securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	14,472	15,423
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 3 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 3 | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 3 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 3 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	0	0
Level 3 | U.S. Small Business Administration securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Mortgage loans held for sale (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	$ 45,591	$ 51,195
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	45,591	51,195
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	$ 0	$ 0

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Interest Rate Lock Commitments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Fallout adjusted interest rate lock commitments with customers - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	$ 686	$ 503
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	$ 686	$ 503

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Forward Sale Commitments with Investors (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	$ (397)	$ (574)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	(301)	(540)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	$ (96)	$ (34)

Fair Value of Financial Instr_7

Fair Value of Financial Instruments - Paired Off Commitments with Investors (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Paired off commitments with investors, liability	$ 160	$ 64
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Paired off commitments with investors, liability	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Paired off commitments with investors, liability	160	64
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Paired off commitments with investors, liability	$ 0	$ 0

Fair Value of Financial Instr_8

Fair Value of Financial Instruments - Impaired Loans and OREO (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 167	$ 689
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	2,981	3,894
OREO	167	689
Servicing Rights	12,914	14,593
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	2,981	3,894
OREO	167	689
Servicing Rights	$ 12,914	$ 14,593

Fair Value of Financial Instr_9

Fair Value of Financial Instruments - Discount Rate (Details)	Mar. 31, 2019item
Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	fsbw:MeasurementInputPullThroughExpectationsMember
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	fsbw:QuotedMarketPricesMember
Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	fsbw:MeasurementInputPullThroughExpectationsMember
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	fsbw:QuotedMarketPricesMember
Fair Value, Measurements, Nonrecurring | Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	fsbw:MeasurementInputDiscountAppliedToObtainedAppraisalMember
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	fsbw:FairValueOfUnderlyingCollateralMember
Fair Value, Measurements, Nonrecurring | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	fsbw:MeasurementInputDiscountAppliedToObtainedAppraisalMember
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	fsbw:FairValueOfCollateralMember
Fair Value, Measurements, Nonrecurring | Servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.135
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	fsbw:PrepaymentSpeedsMember
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	fsbw:IndustrySourcesMember
Level 3 | Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.80
Level 3 | Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.99
Level 3 | Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.950
Level 3 | Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.80
Level 3 | Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.99
Level 3 | Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.950
Level 3 | Fair Value, Measurements, Nonrecurring | Impaired Loans | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0
Level 3 | Fair Value, Measurements, Nonrecurring | Impaired Loans | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.50
Level 3 | Fair Value, Measurements, Nonrecurring | Impaired Loans | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.112
Level 3 | Fair Value, Measurements, Nonrecurring | Other Real Estate Owned | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0
Level 3 | Fair Value, Measurements, Nonrecurring | Other Real Estate Owned | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.75
Level 3 | Fair Value, Measurements, Nonrecurring | Other Real Estate Owned | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.357
Level 3 | Fair Value, Measurements, Nonrecurring | Servicing rights | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.10
Level 3 | Fair Value, Measurements, Nonrecurring | Servicing rights | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement inputs (as a percent)	0.26

Fair Value of Financial Inst_10

Fair Value of Financial Instruments - Fair Value Level 3 on recurring basis (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fallout adjusted interest rate lock commitments with customers
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 503	$ 726
Purchases and Issuances	1,931	2,435
Sales and Settlements	(1,748)	(2,346)
Ending Balance	686	815
Net change in fair value for gains/(losses) relating to items held at end of period	183	89
Mandatory and best effort forward commitments with investors
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(34)	51
Purchases and Issuances	(162)	573
Sales and Settlements	100	(620)
Ending Balance	(96)	4
Net change in fair value for gains/(losses) relating to items held at end of period	$ (62)	$ (47)

Fair Value of Financial Inst_11

Fair Value of Financial Instruments - Fair Value By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets
Certificates of deposit at other financial institutions	$ 22,073	$ 22,074
Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	99,783	97,205
Loans held for sale, at fair value	45,591	51,195
Financial Liabilities
Paired off commitments with investors, liability	(160)	(64)
Level 1 | Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	0	0
Loans held for sale, at fair value	0	0
Financial Liabilities
Paired off commitments with investors, liability	0	0
Level 2 | Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	99,783	97,205
Loans held for sale, at fair value	45,591	51,195
Financial Liabilities
Paired off commitments with investors, liability	(160)	(64)
Level 3 | Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	0	0
Loans held for sale, at fair value	0	0
Financial Liabilities
Paired off commitments with investors, liability	0	0
Carrying Amount | Level 1
Financial Assets
Cash and cash equivalents	63,074	32,779
Certificates of deposit at other financial institutions	22,073	22,074
Carrying Amount | Level 2
Financial Assets
Securities available-for-sale, at fair value	99,783	97,205
Loans held for sale, at fair value	45,591	51,195
FHLB stock, at cost	8,157	9,887
Accrued interest receivable	5,812	5,761
Financial Liabilities
Deposits	1,321,550	1,274,219
Borrowings	86,824	137,149
Subordinated note, net	9,870	9,865
Accrued interest payable	504	344
Paired off commitments with investors, liability	(160)	(64)
Individual forward sale commitments with investors, financial liability	301	540
Carrying Amount | Level 3
Financial Assets
Loans receivable, gross	1,297,070	1,326,238
Servicing rights, held at lower of cost or fair value	10,611	10,429
Fair value interest rate locks with customers	686	503
Financial Liabilities
Individual forward sale commitments with investors, financial liability	96	34
Fair Value | Level 1
Financial Assets
Cash and cash equivalents	63,074	32,779
Certificates of deposit at other financial institutions	22,073	22,074
Fair Value | Level 2
Financial Assets
Securities available-for-sale, at fair value	99,783	97,205
Loans held for sale, at fair value	45,591	51,195
FHLB stock, at cost	8,157	9,887
Accrued interest receivable	5,812	5,761
Financial Liabilities
Deposits	1,310,404	1,261,096
Borrowings	86,609	136,873
Subordinated note, net	10,242	10,242
Accrued interest payable	504	344
Paired off commitments with investors, liability	(160)	(64)
Individual forward sale commitments with investors, financial liability	301	540
Fair Value | Level 3
Financial Assets
Loans receivable, gross	1,302,247	1,320,341
Servicing rights, held at lower of cost or fair value	12,914	14,593
Fair value interest rate locks with customers	686	503
Financial Liabilities
Individual forward sale commitments with investors, financial liability	$ 96	$ 34

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($)	Jul. 09, 2012	Jan. 02, 2012	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Compensation and Retirement Disclosure [Abstract]
Number of hours of service required for participation in ESOP, per first 12 month period (in hours)		1000 hours
Vesting percentage after requisite service period is met (as a percent)		100.00%
Requisite service period (in years)		2 years
Employee stock ownership plan (ESOP), requisite service period and 12 months		1000 hours
Employee stock ownership plan (ESOP), debt structure, employer loan, amount	$ 2,600,000
Employee stock ownership plan shares purchased	259,210
Employee stock ownership plan (ESOP), weighted average purchase price of shares purchased (in dollars per share)	$ 10.17
Amortization period of ESOP loan	10 years
Employee stock ownership plan (ESOP), debt structure, employer loan, interest rate	2.30%
Employee stock ownership plan (ESOP), periodic installment payments from esop, amount paid					$ 269,000
Employee stock ownership plan (ESOP), interest payments from esop					$ 26,000
ESOP compensation expense for allocated shares			$ 321,000	$ 359,000

Employee Benefits - Schedule of

Employee Benefits - Schedule of Shares Under ESOP (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated shares	176,809	153,049
Committed to be released shares	6,480	6,480
Unallocated shares	71,283	97,204
Total ESOP shares	254,572	256,733
Fair value of unallocated shares (in thousands)	$ 3,530	$ 5,382

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income	$ 5,192	$ 4,322
Basic weighted average common shares outstanding	4,355,307	3,556,581
Dilutive shares (in shares)	138,119	194,956
Diluted weighted average common shares outstanding	4,493,426	3,751,537
Basic earnings per share (in dollars per share)	$ 1.19	$ 1.22
Diluted earnings per share (in dollars per share)	$ 1.15	$ 1.15
Potentially dilutive securities excluded from EPS	44,488

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	Aug. 15, 2018	Jan. 01, 2016	May 08, 2014	Sep. 30, 2013	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	May 17, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected forfeiture rate over contractual term					3.10%
Award contractual life					10 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested					$ 162,000	$ 82,000
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					$ 262,000	$ 135,000
Granted (in shares)					0
Shares available for grant					6,013
Stock option, fair value assumption, expected life							6 years 9 months 29 days
Remaining weighted-average vesting period					6 years 6 months 15 days
2013 Equity Incentive Plan | Equity option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)				324,013
Granted (in shares)				322,000
Market price per share (in dollars per share)			$ 16.89
Award vesting period			5 years
2013 Equity Incentive Plan | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)				129,605
Shares		4,500	125,105
Market price per share (in dollars per share)		$ 26	$ 16.89
Unrecognized compensation cost, nonvested awards					$ 1,300,000
Weighted-average vesting period					4 years 3 months 18 days
2013 Equity Incentive Plan | Restricted stock awards | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
2013 Equity Incentive Plan | Restricted stock awards | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant					387,000
2018 Equity Incentive Plan | Equity option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	100,000
2018 Equity Incentive Plan | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)								163,000
Shares	25,000
2018 Equity Incentive Plan | Restricted stock awards | Directors And Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
2018 Equity Incentive Plan | Equity option and restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)								650,000
Market price per share (in dollars per share)	$ 58.60
2013 and 2018 Equity Incentive Plans | Equity option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Annual award vesting percentage					20.00%
Award contractual life					10 years
Expiration period					10 years
Stock option, fair value assumption, expected life					6 years 6 months
Unrecognized compensation cost, nonvested awards					$ 1,200,000
Remaining weighted-average vesting period					4 years 3 months 18 days

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity (Details) - 2013 Equity Incentive Plan - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Shares
Outstanding, beginning balance (in shares)	290,104
Granted, Shares	0
Less exercised (in shares)	2,600
Forfeited or Expired, Shares	0
Outstanding, ending balance (in shares)	287,504	290,104
Expected to vest, assuming a 0.31% annual forfeiture rate (in shares)	286,750
Exercisable (in shares)	130,204
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expected Forfeiture Rate	0.31%
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 31.27
Granted (in dollars per share)	0
Less exercised (in dollars per share)	16.89
Forfeited or expired, Weighted-Average Exercise Price (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	31.40	$ 31.27
Expected to vest, assuming a 0.31% annual forfeiture rate (in dollars per share)	31.33
Exercisable (in dollars per share)	$ 16.89
Weighted-Average Remaining Contractual Term In Years
Outstanding, beginning balance		6 years 9 months 29 days
Outstanding, ending balance	6 years 6 months 15 days
Expected to vest, assuming a 0.31% annual forfeiture rate, Weighted Average Remaining Contractual Term	6 years 6 months 11 days
Exercisable	4 years 11 months 23 days
Aggregate Intrinsic Value
Beginning balance	$ 4,940,803
Granted	$ 0
Less exercised	$ 92,131
Forfeited or Expired, Aggregate Intrinsic Value	0
Ending balance	6,298,259	$ 4,940,803
Expected to vest, assuming a 0.31% annual forfeiture rate	6,297,620
Exercisable	$ 4,373,552

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Awards (Details) - Restricted stock awards	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Shares
Nonvested, Beginning balance (in shares) | shares	43,421
Granted (shares) | shares	0
Less vested (in shares) | shares	3,300
Forfeited or expired ( in shares) | shares	0
Nonvested, Ending balance (in shares) | shares	40,121
Weighted-Average Grant-Date Fair Value Per Share
Nonvested, Beginning balance (in dollars per share) | $ / shares	$ 41.22
Granted (in dollars per share) | $ / shares	0
Less vested (in dollars per share) | $ / shares	21.03
Forfeited or expired (in dollars per share) | $ / shares	0
Nonvested, Ending balance (in dollars per share) | $ / shares	$ 42.88
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	4 years 3 months 18 days

Regulatory Capital - Compliance

Regulatory Capital - Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, Ratio	13.90%		15.80%
Tier 1 risk-based capital, Ratio	13.00%		14.50%
Tier 1 leverage capital, Ratio	11.10%		12.20%
CET 1 capital, Ratio	13.00%		14.50%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 to Risk Weighted Assets, Capital Conservation Buffer, Phased in	6.73%
Total risk-based capital, Amount	$ 193,032	$ 188,472
Total risk-based capital, Ratio	14.73%	13.52%
Total risk-based capital, For Capital Adequacy Purposes, Amount	$ 104,832	$ 111,493
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, For Capital Adequacy with Capital Buffer, Amount	$ 137,592	$ 137,694
Total risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	10.50%	9.88%
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 131,040	$ 139,366
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Amount	$ 180,902	$ 175,824
Tier 1 risk-based capital, Ratio	13.81%	12.62%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Amount	$ 78,624	$ 83,620
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 risk-based capital, For Capital Adequacy with Capital Buffer, Amount	$ 111,384	$ 109,820
Tier 1 risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	8.50%	7.88%
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 104,832	$ 111,493
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier 1 leverage capital	$ 180,902	$ 175,824
Tier 1 leverage capital, Ratio	11.01%	10.67%
Tier 1 leverage capital, For Capital Adequacy Purposes, Amount	$ 65,702	$ 65,884
Tier 1 leverage capital, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 leverage capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 82,127	$ 82,355
Tier 1 leverage capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
CET 1 capital, Amount	$ 180,902	$ 175,824
CET 1 capital, Ratio	13.81%	12.62%
CET 1 capital, For Capital Adequacy Purposes, Amount	$ 58,968	$ 62,715
CET 1 capital, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
CET 1 capital, For Capital Adequacy with Capital Buffer, Amount	$ 91,728	$ 88,846
CET 1 capital, For Capital Adequacy with Capital Buffer, Ratio	7.00%	6.38%
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 85,176	$ 90,588
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%

Business Segments - Narrative (

Business Segments - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)segmentitem	Dec. 31, 2018USD ($)	Jan. 22, 2016item
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Number of bank branches			4
Commercial and Consumer Banking	fsbw:CommercialAndConsumerBankingMember
Total deposits | $	$ 1,321,550	$ 1,274,219
Retail Deposit | Pacific Northwest
Segment Reporting Information [Line Items]
Number of bank branches	21

Business Segments - Segment Fin

Business Segments - Segment Financial Results (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)employee	Mar. 31, 2018USD ($)employee
Segment Reporting Information [Line Items]
Net interest income	$ 17,689	$ 11,497
Provision for loan losses	(750)	(350)
Noninterest income	4,555	5,024
Noninterest expense	(14,797)	(11,036)
INCOME BEFORE PROVISION FOR INCOME TAXES	6,697	5,135
Provision for income taxes	(1,505)	(813)
NET INCOME	5,192	4,322
Total average assets at quarter end	$ 1,614,861	$ 1,016,718
FTEs | employee	426	329
Home Lending
Segment Reporting Information [Line Items]
Net interest income	$ 1,071	$ 715
Provision for loan losses	(59)	4
Noninterest income	2,419	3,766
Noninterest expense	(3,304)	(4,056)
INCOME BEFORE PROVISION FOR INCOME TAXES	127	429
Provision for income taxes	(29)	(68)
NET INCOME	98	361
Total average assets at quarter end	$ 239,287	$ 216,384
FTEs | employee	112	116
Commercial and Consumer Banking
Segment Reporting Information [Line Items]
Net interest income	$ 16,618	$ 10,782
Provision for loan losses	(691)	(354)
Noninterest income	2,136	1,258
Noninterest expense	(11,493)	(6,980)
INCOME BEFORE PROVISION FOR INCOME TAXES	6,570	4,706
Provision for income taxes	(1,476)	(745)
NET INCOME	5,094	3,961
Total average assets at quarter end	$ 1,375,574	$ 800,334
FTEs | employee	314	213

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,312,000		$ 2,312,000
Goodwill, Impairment Loss			0
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	7,490,000		7,490,000	$ 2,239,000
FiniteLivedIntangibleAssetsAccumulatedAmortization	(1,463,000)		(1,273,000)	(922,000)
Amortization of Intangible Assets	190,000	$ 77,000	307,000
Finite-Lived Intangible Assets, Net	6,027,000		6,217,000	1,317,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2019	570,000
2019	706,000
2020	691,000
2021	691,000
2022	691,000
Thereafter	2,678,000
Total	$ 6,027,000		6,217,000	$ 1,317,000
Anchor Bancorp
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross			5,251,000
FiniteLivedIntangibleAssetsAccumulatedAmortization			(44,000)
Finite-Lived Intangible Assets, Net			5,207,000
Amortization period	10 years
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total			$ 5,207,000
Bank of America
Finite-Lived Intangible Assets, Net [Abstract]
Amortization period	9 years

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Not in scope noninterest income.	$ 3,900,000	$ 4,600,000
Commercial and Consumer Banking | Deposit Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	1,100,000	551,000
Commercial and Consumer Banking | Debit Card Interchange Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	423,000	260,000
Commercial and Consumer Banking | Non Sufficient Funds Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 271,000	$ 120,000