FS Bancorp (FSBW) 10-K 16 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 09, 2018	Jun. 30, 2017
Document And Entity Information
Entity Registrant Name	FS Bancorp, Inc.
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Entity Central Index Key	1,530,249
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		3,695,552
Entity Filer Category	Accelerated Filer
Entity Voluntary Filers	No
Entity Public Float			$ 121,778,776
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 3,043	$ 3,590
Interest-bearing deposits at other financial institutions	15,872	32,866
Total cash and cash equivalents	18,915	36,456
Certificates of deposit at other financial institutions	18,108	15,248
Securities available-for-sale, at fair value	82,480	81,875
Loans held for sale, at fair value	53,463	52,553
Loans receivable, net	761,558	593,317
Accrued interest receivable	3,566	2,524
Premises and equipment, net	15,458	16,012
Federal Home Loan Bank ("FHLB") stock, at cost	2,871	2,719
Bank owned life insurance ("BOLI"), net	10,328	10,054
Servicing rights, held at the lower of cost or fair value	6,795	8,459
Goodwill	2,312	2,312
Core deposit intangible, net	1,317	1,717
Other assets	4,612	4,680
TOTAL ASSETS	981,783	827,926
LIABILITIES
Noninterest-bearing accounts	186,890	155,053
Interest-bearing accounts	642,952	557,540
Total deposits	829,842	712,593
Borrowings	7,529	12,670
Principal amount	10,000	10,000
Unamortized debt issuance costs	(155)	(175)
Total subordinated note less unamortized debt issuance costs	9,845	9,825
Deferred tax liability, net	607	1,161
Other liabilities	11,958	10,644
Total liabilities	859,781	746,893
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDER'S EQUITY
Preferred stock, $.01 par value; 5,000,000 shares authorized; none issued or outstanding
Common stock, $.01 par value; 45,000,000 shares authorized; 3,680,152 and 3,059,503 shares issued and outstanding at December 31, 2017, and December 31, 2016, respectively	37	31
Additional paid-in capital	55,135	27,334
Retained earnings	68,422	55,584
Accumulated other comprehensive loss, net of tax	(475)	(536)
Unearned shares – Employee Stock Ownership Plan (“ESOP”)	(1,117)	(1,380)
Total stockholders' equity	122,002	81,033
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 981,783	$ 827,926

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
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	3,680,152	3,059,503
Common stock, shares outstanding	3,680,152	3,059,503

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Loans receivable, including fees	$ 43,457,000	$ 35,772,000
Interest and dividends on investment securities, cash and cash equivalents, and certificates of deposit at other financial institutions	2,724,000	2,248,000
Total interest and dividend income	46,181,000	38,020,000
Total interest expense	4,933,000	4,163,000
INTEREST EXPENSE
Deposits	3,920,000	3,254,000
Borrowings	334,000	226,000
Subordinated note	679,000	683,000
Total interest expense	4,933,000	4,163,000
NET INTEREST INCOME	41,248,000	33,857,000
PROVISION FOR LOAN LOSSES	750,000	2,400,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	40,498,000	31,457,000
NONINTEREST INCOME
Service charges and fee income	3,548,000	3,391,000
Gain on sale of loans	17,985,000	19,058,000
Gain on sale of investment securities	380,000	146,000
Gain on sale of mortgage servicing rights ("MSR")	1,062,000
Earnings on cash surrender value of BOLI	274,000	282,000
Other noninterest income	825,000	692,000
Total noninterest income	24,074,000	23,569,000
NONINTEREST EXPENSE
Salaries and benefits	26,595,000	21,982,000
Operations	6,205,000	6,000,000
Occupancy	2,672,000	2,404,000
Data processing	2,521,000	2,134,000
Gain on sale of other real estate owned (“OREO”)		(150,000)
Loan costs	2,652,000	2,505,000
Professional and board fees	1,697,000	1,943,000
Federal Deposit Insurance Corporation (“FDIC”) insurance	535,000	487,000
Marketing and advertising	716,000	710,000
Acquisition costs		389,000
Amortization of core deposit intangible	400,000	522,000
Recovery on servicing rights		(3,000)
Total noninterest expense	43,993,000	38,923,000
INCOME BEFORE PROVISION FOR INCOME TAXES	20,579,000	16,103,000
PROVISION FOR INCOME TAXES	6,494,000	5,604,000
NET INCOME	$ 14,085,000	$ 10,499,000
Basic earnings per share (in dollars per share)	$ 4.55	$ 3.63
Diluted earnings per share (in dollars per share)	$ 4.28	$ 3.51

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 14,085	$ 10,499
Securities available-for-sale:
Unrealized holding gain (loss) during year	605	(804)
Income tax (provision) benefit related to unrealized holding gain	(213)	286
Reclassification adjustment for realized gain included in net income	(380)	(146)
Income tax provision related to reclassification for realized gain	133	50
Other comprehensive income (loss), net of tax	145	(614)
COMPREHENSIVE INCOME	$ 14,230	$ 9,885

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Unearned ESOP Shares	Total
Beginning Balance at (in shares) at Dec. 31, 2015	3,242,120
Beginning Balance at Dec. 31, 2015	$ 32,000	$ 30,692,000	$ 46,175,000	$ 78,000	$ (1,637,000)	$ 75,340,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			10,499,000			10,499,000
Dividends paid			(1,090,000)			(1,090,000)
Share-based compensation		783,000				783,000
Restricted stock awards (in shares)	4,500
Common stock repurchase	$ (1,000)	(4,902,000)				(4,903,000)
Common stock repurchased (in shares)	(198,167)
Stock options exercised		186,000				186,000
Stock options shares exercised (in shares)	11,050
Other comprehensive income (loss), net of tax				(614,000)		(614,000)
ESOP shares allocated		575,000			257,000	832,000
Ending Balance at (in shares) at Dec. 31, 2016	3,059,503
Ending Balance at Dec. 31, 2016	$ 31,000	27,334,000	55,584,000	(536,000)	(1,380,000)	81,033,000
Ending balance at Dec. 31, 2016						81,033,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			14,085,000			14,085,000
Dividends paid			(1,331,000)			(1,331,000)
Proceeds from public offering, net of offering expenses of $326,000	$ 6,000	25,612,000				25,618,000
Proceeds from public offering, net of offering expenses of $326,000 (in shares)	587,234
Share-based compensation		634,000				634,000
Common stock repurchase		(275,000)				(275,000)
Common stock repurchased (in shares)	(6,198)
Stock options exercised		669,000				$ 669,000
Stock options shares exercised (in shares)	39,613					39,613
Other comprehensive income (loss), net of tax				145,000		$ 145,000
ESOP shares allocated		1,161,000			263,000	1,424,000
AOCI to Retained Earnings, Tax Effect			84,000	(84,000)
Ending Balance at (in shares) at Dec. 31, 2017	3,680,152
Ending Balance at Dec. 31, 2017	$ 37,000	$ 55,135,000	$ 68,422,000	$ (475,000)	$ (1,117,000)	122,002,000
Ending balance at Dec. 31, 2017						$ 122,002,000

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)	$ 0.41	$ 0.36
Offering expenses	$ 326,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Net income	$ 14,085	$ 10,499
Adjustments to reconcile net income to net cash from operating activities
Provision for loan losses	750	2,400
Depreciation, amortization and accretion	3,938	5,210
Compensation expense related to stock options and restricted stock awards	634	783
ESOP compensation expense for allocated shares	1,424	832
(Benefit) provision for deferred income taxes	(718)	206
Increase in cash surrender value of BOLI	(274)	(282)
Gain on sale of loans held for sale	(17,487)	(19,058)
Gain on sale of portfolio loans	(498)
Gain on sale of investment securities	(380)	(146)
Gain on sale of OREO		(150)
Gain on sale of MSR	(1,062)
Origination of loans held for sale	(698,504)	(718,864)
Proceeds from sale of loans held for sale	711,766	726,831
Recovery on servicing rights		(3)
Changes in operating assets and liabilities
Accrued interest receivable	(1,042)	(417)
Other assets	1,256	(7,326)
Other liabilities	1,196	3,073
Net cash from (used by) operating activities	15,084	3,588
Activity in securities available-for-sale:
Proceeds from sale of investment securities	39,103	13,577
Maturities, prepayments, sales, and calls	7,580	14,093
Purchases	(47,271)	(55,811)
Maturities of certificates of deposit at other financial institutions	1,240	292
Purchase of certificates of deposit at other financial institutions	(4,102)	(3,122)
Loan originations and principal collections, net	(155,793)	(95,043)
Purchase of portfolio loans	(38,950)
Proceeds from sale of portfolio loans	25,120
Proceeds from sale of other real estate owned, net		682
Purchase of premises and equipment, net	(1,016)	(3,595)
Proceeds from sale of MSR	4,827
FHLB stock, net	(152)	1,832
Net cash received from acquisition		180,356
Net cash (used by) from investing activities	(169,414)	53,261
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	117,249	47,059
Proceeds from borrowings	495,274	349,125
Repayments of borrowings	(500,415)	(435,225)
Dividends paid	(1,331)	(1,090)
Proceeds from stock options exercised	669	186
Common stock repurchased	(275)	(4,903)
Proceeds from issuance of common stock, net	25,618
Net cash from (used by) financing activities	136,789	(44,848)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(17,541)	12,001
CASH AND CASH EQUIVALENTS, beginning of period	36,456	24,455
CASH AND CASH EQUIVALENTS, end of period	18,915	36,456
Cash paid during the year for:
Interest	4,904	4,164
Income taxes	8,100	6,110
Assets acquired in acquisition of branches (Note 2)		181,575
Liabilities assumed in acquisition of branches (Note 2)		186,393
SUPPLEMENTARY DISCLOSURES OF NONCASH OPERATING, INVESTING AND FINANCING ACTIVITIES
Change in unrealized gain on investment securities	225	(950)
Transfer portfolio loans to loans held for sale	1,886
Property received in settlement of loans		525
Retention of gross mortgage servicing rights from loan sales	$ 5,075	$ 4,194

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
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 proposed 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 11 full-service bank branches and seven home loan production offices in suburban communities in the greater Puget Sound area which includes Snohomish, King, Pierce, Jefferson, Kitsap, and Clallam counties, and one home 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 Bank acquired four retail bank branches from Bank of America, National Association (“Bank of America”) (two in Clallam and two in Jefferson counties) on January 22, 2016, and these branches opened as 1st Security Bank branches on January 25, 2016. The Company and its subsidiary are subject to regulation by certain federal and state agencies and undergo periodic examination by these regulatory agencies. Pursuant to the Plan of Conversion (the “Plan”), the Company’s Board of Directors adopted an employee stock ownership plan ( “ESOP”) which purchased 8% of the common stock in the open market or 259,210 shares. As provided for in the Plan, the Bank also established a liquidation account in the amount of retained earnings at December 31, 2011. The liquidation account is maintained for the benefit of eligible savings account holders at June 30, 2007 and supplemental eligible account holders as of March 31, 2012, who maintain deposit accounts at the Bank after the conversion. The conversion was accounted for as a change in corporate form with the historic basis of the Company’s assets, liabilities, and equity unchanged as a result. Financial Statement Presentation - The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and with prevailing practices within the banking and securities industries. In preparing such financial statements, management is required to make certain estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the balance sheet and the reported amounts of revenues and expenses for the reporting period. Actual results could differ significantly from those 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 in thousands of dollars except per share amounts. In the narrative footnote discussion, amounts are rounded and presented in millions of dollars to one decimal point if the amounts are above $1.0 million. Amounts below $1.0 million are rounded and presented in dollars to the nearest thousands. Certain prior year amounts have been reclassified to conform to the 2017 presentation with no change to consolidated net income or stockholders’ equity previously reported. 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 19 – Business Segments”. Subsequent Events - The Company has entered into a five year lease with two five year option renewals for a new retail branch location in Silverdale, Washington, expected to open in April 2018. Cash and Cash Equivalents - Cash and cash equivalents include cash and due from banks, and interest-bearing balances due from other banks and the Federal Reserve Bank of San Francisco (“FRB”) and have a maturity of 90 days or less at the time of purchase. At times, cash balances may exceed Federal Deposit Insurance Corporation (“FDIC”) insured limits. At December 31, 2017 and 2016, the Company had $15,000 and $7.8 million, respectively, of cash and due from banks and interest-bearing deposits at other financial institutions in excess of FDIC insured limits. Because the Company places these deposits with major financial institutions and monitors the financial condition of these institutions, management believes the risk of loss to any deposits in excess of FDIC limits to be minimal. Securities Available-for-Sale - Securities available-for-sale consist of debt securities that the Company has the intent and ability to hold for an indefinite period, but not necessarily to maturity. Such securities may be sold to implement the Company’s asset/liability management strategies and in response to changes in interest rates and similar factors. Securities available-for-sale are reported at fair value. Realized gains and losses on securities available-for-sale, determined using the specific identification method, are included in results of operations. Amortization of premium and accretion of discounts are recognized in interest income over the period to maturity. Unrealized holding gains and losses, net of the related deferred tax effect, are reported as a net amount in a separate component of equity entitled accumulated other comprehensive income. Unrealized losses that are deemed to be other than temporary are reflected in results of operations. Any declines in the values of these securities that are considered to be other-than-temporary-impairment (“OTTI”) and credit-related are recognized in earnings. Noncredit-related OTTI on securities not expected to be sold is recognized in other comprehensive income. The review for OTTI is conducted on an ongoing basis and takes into account the severity and duration of the impairment, recent events specific to the issuer or industry, fair value in relationship to cost, extent and nature of change in fair value, creditworthiness of the issuer including external credit ratings and recent downgrades, trends and volatility of earnings, current analysts’ evaluations, and other key measures. In addition, the Company does not intend to sell the securities and it is more likely than not that we will not be required to sell the securities before recovery of their amortized cost basis. In doing this, we take into account our balance sheet management strategy and consideration of current and future market conditions. Dividends and interest income are recognized when earned. Federal Home Loan Bank Stock - The Bank’s investment in FHLB stock is carried at cost, which approximates fair value. As a member of the FHLB system, the Bank is required to maintain an investment in capital stock of the FHLB in an amount of $994,000 and 4.0% of advances from the FHLB. The Bank’s required minimum level of investment in FHLB stock is based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. At December 31, 2017 and 2016, the Bank’s minimum level of investment requirement in FHLB stock was $2.9 million and $2.7 million, respectively. The Bank was in compliance with the FHLB minimum investment requirement at December 31, 2017 and 2016. Management evaluates FHLB stock for impairment as needed. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared with the capital stock amount for the FHLB and the length of time this situation has persisted; (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB; (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB; and (4) the liquidity position of the FHLB. Based on its evaluation, management determined that there was no impairment of FHLB stock at December 31, 2017 and 2016, respectively. Loans Held for Sale - The Bank records all mortgage loans held-for-sale at fair value. Fair value is determined by outstanding commitments from investors or current investor yield requirements calculated on the aggregate loan basis. Origination fees and costs are recognized in earnings at the time of origination. Mortgage loans held-for-sale are sold with the mortgage service rights either released or retained by the Bank. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold. All sales are made with limited recourse against the Company. Derivatives - Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as free-standing derivatives. The fair value of the interest rate lock is recorded at the time the commitment to fund the mortgage loan is executed and is adjusted for the expected exercise of the commitments to fund the loans, the Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered. Fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates from the date the interest on the loan is locked. Changes in the fair values of these derivatives are reported in “Gain on sale of loans” on the Consolidated Statements of Income. Loans Receivable - Loans receivable, are stated at the amount of unpaid principal reduced by an allowance for loan losses and net deferred fees or costs. Interest on loans is calculated using the simple interest method based on the daily balance of the principal amount outstanding and is credited to income as earned. Loan fees, net of direct origination costs, are deferred and amortized over the life of the loan using the effective yield method. Interest on loans is accrued daily based on the principal amount outstanding. Generally, the accrual of interest on loans is discontinued when, in management’s opinion, the borrower may be unable to meet payments as they become due or when they are past due 90 days as to either principal or interest (based on contractual terms), unless they are well secured and in the process of collection. All interest accrued but not collected for loans that are placed on non-accrual status or charged off are reversed against interest income. Subsequent collections on a cash basis are applied proportionately to past due principal and interest, unless collectability of principal is in doubt, in which case all payments are applied to principal. Loans are returned to accrual status when the loan is deemed current, and the collectability of principal and interest is no longer doubtful, or, generally, when the loan is less than 90 days delinquent, and performing according to its contractual terms after a period of six months performance. The Company charges fees for originating loans. These fees, net of certain loan origination costs, are deferred and amortized to income, on the level-yield basis, over the loan term. If the loan is repaid prior to maturity, the remaining unamortized net deferred loan origination fee is recognized in income at the time of repayment. Impaired Loans - A loan is considered impaired when it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with the original or modified terms of the loan agreement. Impaired loans are measured on a loan by loan basis based on the estimated fair value of the collateral less estimated cost to sell if the loan is considered collateral dependent. Impaired loans not considered to be collateral dependent are measured based on the present value of expected future cash flows. Impairment is measured for each loan in the portfolio except for the smaller groups of homogeneous consumer loans. The categories of non-accrual loans and impaired loans overlap, although they are not coextensive. The Company considers all circumstances regarding the loan and borrower on an individual basis when determining whether an impaired loan should be placed on non-accrual status, such as the financial strength of the borrower, the collateral value, reasons for delay, payment record, the amount of past due and the number of days past due. Loans that experience insignificant payment delays and payment shortfalls are generally not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of shortfall in relation to the principal and interest owed. Allowance for Loan Losses - The allowance for loan losses is maintained at a level considered adequate to provide for probable losses on existing loans based on evaluating known and inherent risks in the loan portfolio. The allowance is reduced by loans charged off and increased by provisions charged to earnings and recoveries on loans previously charged-off. The allowance is based on management’s periodic, systematic evaluation of factors underlying the quality of the loan portfolio including changes in the size and composition of the loan portfolio, the estimated value of any underlying collateral, actual loan loss experience, current economic conditions, and detailed analysis of individual loans for which full collectability may not be assured. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. While management uses the best information available to make its estimates, future adjustments to the allowance may be necessary if there is a significant change in economic and other conditions. The appropriateness of the allowance for loan losses is estimated based on these factors and trends identified by management at the time the financial statements are prepared. When available information confirms that specific loans or portions thereof are uncollectible, these amounts are charged-off against the allowance for loan losses. The existence of some or all of the following criteria will generally confirm that a loss has been incurred: the loan is significantly delinquent and the borrower has not evidenced the ability or intent to bring the loan current; the Company has no recourse to the borrower, or if it does, the borrower has insufficient assets to pay the debt; the estimated fair value of the loan collateral is significantly below the current loan balance, and there is little or no near-term prospect for improvement. A provision of loan losses is charged against income and added to the allowance for loan losses based on regular assessment of the loan portfolio. The allowance for loan losses is allocated to certain loan categories based on the relative risk characteristics, asset classifications, and actual loss experience within the loan portfolio. Although management has allocated the allowance for loan losses to various loan portfolio segments, the allowance is general in nature and is available for the loan portfolio in its entirety. The ultimate recovery of all loans is susceptible to future market factors beyond the Company’s control. These factors may result in losses or recoveries differing significantly from those provided for in the financial statements. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations. Reserve for Unfunded Loan Commitments - The reserve for unfunded loan commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to these unfunded credit facilities. The determination of the adequacy of the reserve is based on periodic evaluations of the unfunded credit facilities including an assessment of the probability of commitment usage, credit risk factors for loans outstanding to these same customers, and the terms and expiration dates of the unfunded credit facilities. The reserve for unfunded loan commitments is included in other liabilities on the consolidated balance sheet, with changes to the balance charged against noninterest expense. Premises and Equipment, Net - Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. The estimated useful lives used to compute depreciation include building and building improvements from 25 to 40 years and furniture, fixtures, and equipment from 3 to 10 years. Leasehold and tenant improvements are amortized using the straight-line method over the lesser of useful life or the life of the related lease. Gains or losses on dispositions are reflected in results of operations. Management reviews buildings, improvements and equipment for impairment on an annual basis or whenever events or changes in the circumstances indicate that the undiscounted cash flows for the property are less than its carrying value. If identified, an impairment loss is recognized through a charge to earnings based on the fair value of the property. Transfers of Financial Assets - Transfers of an entire financial asset, a group of entire financial assets, or participating interest in an entire financial asset are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Servicing Rights - Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Generally, purchased servicing rights are capitalized at the cost to acquire the rights. For sales of mortgage, commercial and consumer loans, a portion of the cost of originating the loan is allocated to the servicing right based on relative fair value. Fair value is based on market prices for comparable mortgage, commercial, or consumer servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, and default rates and losses. Servicing assets are evaluated quarterly for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights into tranches based on predominant characteristics, such as interest rate, loan type, and investor type. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranches. If the Company later determines that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the allowance may be recorded as an increase to income. Capitalized servicing rights are stated separately on the consolidated balance sheets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Income Taxes - The Company files a consolidated federal income tax return. Deferred federal income taxes result from temporary differences between the tax basis of assets and liabilities, and their reported amounts in the financial statements. These will result in differences between income for tax purposes and income for financial reporting purposes in future years. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. Valuation allowances are established to reduce the net recorded amount of deferred tax assets if it is determined to be more likely than not, that all or some portion of the potential deferred tax asset will not be realized. The Financial Accounting Standards Board (“FASB”) issued guidance related to accounting for uncertainty in income taxes. The guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. It is the Company’s policy to record any penalties or interest arising from federal or state taxes as a component of income tax expense. Employee Stock Ownership Plan ( “ ESOP ” ) - Compensation expense recognized for the Company’s ESOP equals the fair value of shares that have been allocated or committed to be released for allocation to participants. Any difference between the fair value of the shares at the time and the ESOP’s original acquisition cost is charged or credited to stockholders’ equity (additional paid-in capital). The cost of ESOP shares that have not yet been allocated or committed to be released is deducted from stockholders’ equity. Earnings Per Share - Basic earnings per share (“EPS”) are computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. For purposes of computing basic and dilutive EPS, ESOP shares that have been committed to be released are outstanding and ESOP shares that have not been committed to be released shall not be considered outstanding. Comprehensive Income (Loss) - Comprehensive income (loss) is comprised of net income and other comprehensive income (loss). Other comprehensive income (loss) includes items recorded directly to equity, such as unrealized holding gains and losses on securities available-for-sale. Financial Instruments - In the ordinary course of business, the Company has entered into agreements for off-balance-sheet financial instruments consisting of commitments to extend credit and stand-by letters of credit. Such financial instruments are recorded in the financial statements when they are funded or related fees are incurred or received. Restricted Assets - Federal Reserve regulations require that the Bank maintain reserves in the form of cash on hand and deposit balances with the FRB, based on a percentage of deposits. The amounts of such balances for the years ended December 31, 2017 and 2016 were $18.2 million and $10.7 million, respectively, included in interest-bearing deposits at other financial institutions on the balance sheet. Marketing and Advertising Costs - The Company records marketing and advertising costs as expenses as they are incurred. Total marketing and advertising expense was $716,000 and $710,000 for the years ended December 31, 2017 and 2016, respectively. Stock-Based Compensation - Compensation cost is recognized for stock options and restricted stock awards, based on the fair value of these awards at the grant date. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the grant date is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. Goodwill - Goodwill is recorded upon completion of a business combination as the difference between the purchase price and the fair value of net identifiable assets acquired. Goodwill was not recorded until the first quarter of 2016 in recognition of the four retail branches purchased from Bank of America. Subsequent to initial recognition, the Company tests goodwill for impairment during the fourth quarter of each fiscal year, or more often if events or circumstances, such as adverse changes in the business climate indicate there may be impairment. There was no goodwill impairment at December 31, 2017 or December 31, 2016. Application of New Accounting Guidance On October 1, 2017, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2017‑04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to simplify the subsequent measurement of goodwill and the amendment eliminates Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. The Company still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The application of this ASU did not have a material impact on the Company’s consolidated financial statements. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Cuts and Jobs Act of 2017 (the “Tax Act”). SAB 118 provides guidance to registrants under three scenarios: (1) Measurement of certain income tax effects is complete, (2) Measurement of certain income tax effects can be reasonably estimated and (3) Measurement of certain income tax effects cannot be reasonably estimated. SAB 118 provides a one year measurement period for the registrant to complete its accounting for certain income tax effects that are considered provisional or for which reasonable estimates cannot be made. The Company recognized the income tax effects of the 2017 Tax Act in its 2017 financial statements in accordance with SAB 118. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU No. 2014‑09, Revenue from Contracts with Customers (Topic 606), which creates Topic 606 and supersedes Topic 605, Revenue Recognition. In August 2015, FASB issued ASU No. 2015‑14, Revenue from Contracts with Customers (Topic 606) , which postponed the effective date of 2014‑09. The core principle of Topic 606 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In general, the new guidance requires companies to use more judgment and make more estimates than under current guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The ASU is effective for public entities for interim and annual periods beginning after December 15, 2017; early adoption is not permitted. For financial reporting purposes, the ASU allows for either full retrospective adoption, meaning the ASU is applied to all of the periods presented, or modified retrospective adoption, meaning the ASU is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. As a bank holding company, key revenue sources, such as interest income have been identified as out of the scope of this new guidance. The Company’s analysis suggests that the adoption of this accounting standard is not expected to have a material impact on the Company’s consolidated financial statements as substantially all of the Company’s revenues are excluded from the scope of the new guidance. The Company plans to adopt the new guidance on January 1, 2018, utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016‑01, Financial Instruments - Overall (Subtopic 825‑10), Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance is intended to improve the recognition and measurement of financial instruments. This ASU requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. In addition, the amendments in this ASU require the exit price notion be used when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. This ASU also eliminates the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. The ASU also requires a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. ASU No. 2016‑01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted for certain provisions. The adoption of ASU No. 2016-01 is not expected to have a material impact on the Company’s consolidated financial statements and the Company is implementing processes and procedures to ensure it is fully compliant with the disclosures requirements of this ASU related to fair value of its financial instruments beginning with the quarterly reporting period as of March 31, 2018. In February 2016, FASB issued ASU No. 2016‑02, Leases (Topic 842) . ASU No. 2016‑02 requires lessees to recognize on the balance sheet the assets and liabiliti

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2017
Business Combination [Abstract]
Business Combination	NOTE 2 - BUSINESS COMBINATION On January 22, 2016, the Company’s wholly-owned subsidiary, 1st Security Bank, completed the purchase of four branches (“Branch Purchase”) from Bank of America. The Branch Purchase included four retail bank branches located in the communities of Port Angeles, Sequim, Port Townsend, and Hadlock, Washington. In accordance with the Purchase and Assumption Agreement, dated as of September 1, 2015, between Bank of America and 1st Security Bank, the Bank acquired $186.4 million of deposits, a small portfolio of performing loans, two owned bank branches, three leases associated with the bank branches and parking facilities and certain other assets of the branches. In consideration of the purchased assets and transferred liabilities, 1st Security Bank paid (a) the unpaid principal balance and accrued interest of $419,000 for the loans acquired, (b) the net book value, or approximately $778,000, for the bank facilities and certain other assets associated with the acquired branches, and (c) a deposit premium of 2.50% on substantially all of the deposits assumed, which equated to approximately $4.8 million. The transaction was settled with Bank of America paying cash of $180.4 million to 1st Security Bank for the difference between these amounts and the total deposits assumed. The Branch Purchase was accounted for under the acquisition method of accounting and accordingly, the assets and liabilities were recorded at their fair values on January 22, 2016, 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 closing date fair values become available. During the second quarter of 2016, the Company completed a re-evaluation of the core deposit intangible because a portion of core deposits were excluded from the original valuation. The updated valuation of the core deposit intangible increased the fair value adjustment by $100,000 to $2.2 million from $2.1 million resulting in a decrease of $100,000 to the fair value adjustment of goodwill. The impact to consolidated net income was an increase in the amortization of the core deposit intangible for the six months ended June 30, 2016 of $6,000 and was not considered material to the consolidated financial statements. The following table summarizes the estimated fair values of assets acquired and liabilities assumed at the date of acquisition: Acquired Book Fair Value Amount January 22, 2016 Value Adjustments Recorded Assets Cash and cash equivalents $ 180,356 $ — $ 180,356 Loans receivable 417 — 417 Premises and equipment, net 697 267 (1) 964 Accrued interest receivable 2 — 2 Core deposit intangible — 2,239 (2) 2,239 Goodwill — 2,312 (3) 2,312 Other assets 103 — 103 Total assets acquired $ 181,575 $ 4,818 $ 186,393 Liabilities Deposits: Noninterest-bearing accounts $ 79,966 $ — $ 79,966 Interest-bearing accounts 106,398 — 106,398 Total deposits 186,364 — 186,364 Accrued interest payable 7 — 7 Other liabilities 22 — 22 Total liabilities assumed $ 186,393 $ — $ 186,393 Explanation of Fair Value Adjustments (1) The fair value adjustment represents the difference between the fair value of the acquired branches and the book value of the assets acquired. The Company utilized third-party valuations but did not receive appraisals to assist in the determination of fair value. (2) The fair value adjustment represents the value of the core deposit base assumed in the Branch Purchase based 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 an accelerated basis over the average life of the core deposit base, which is estimated to be nine years. (3) The fair value adjustment represents the value of the goodwill calculated from the purchase based on the purchase price, less the fair value of assets acquired net of liabilities assumed. Goodwill - The acquired goodwill represents the excess purchase price over the estimated fair value of the net assets acquired and was recorded at $2.3 million on January 22, 2016. The following table summarizes the aggregate amount recognized for each major class of assets acquired and liabilities assumed by 1st Security Bank in the Branch Purchase: At January 22, 2016 Purchase price (1) $ 6,015 Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value: Cash and cash equivalents 186,371 Acquired loans 417 Premises and equipment, net 964 Accrued interest receivable 2 Core deposit intangible 2,239 Other assets 103 Deposits (186,364) Accrued interest payable (7) Other liabilities (22) Total fair value of identifiable net assets 3,703 Goodwill $ 2,312 (1) Purchase price includes premium paid on the deposits, the aggregate net book value of all assets acquired, and the unpaid principal and accrued interest on loans acquired. Core deposit intangible The core deposit intangible represents the fair value of the acquired core deposit base. The core deposit intangible will be amortized on an accelerated basis over approximately nine years. Total amortization expense was $400,000 for the year ended December 31, 2017, and $522,000 for the same period in 2016. Amortization expense for core deposit intangible is expected to be as follows: 2018 307 2019 235 2020 181 2021 166 2022 166 Thereafter 262 Total $ 1,317

Securities Available-for-sale

Securities Available-for-sale	12 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and 2016: December 31, 2017 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 9,077 $ 49 $ (11) $ 9,115 Corporate securities 7,113 9 (96) 7,026 Municipal bonds 12,720 148 (82) 12,786 Mortgage-backed securities 40,161 63 (490) 39,734 U.S. Small Business Administration securities 14,014 — (195) 13,819 Total securities available-for-sale $ 83,085 $ 269 $ (874) $ 82,480 December 31, 2016 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 8,150 $ 12 $ (94) $ 8,068 Corporate securities 7,654 14 (168) 7,500 Municipal bonds 15,183 164 (83) 15,264 Mortgage-backed securities 45,856 52 (713) 45,195 U.S. Small Business Administration securities 5,862 27 (41) 5,848 Total securities available-for-sale $ 82,705 $ 269 $ (1,099) $ 81,875 At Decemb er 31, 2017, t he Bank pledged nine securities held at the FHLB with a carrying value of $10.7 million to secure Washington State public deposits of $7.6 million with a $3.2 million collateral requirement by the Washington Public Deposit Protection Commission. Investment securities that were in an unrealized loss position at December 31, 2017 and 2016 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. December 31, 2017 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 $ 2,987 $ (11) $ — $ — $ 2,987 $ (11) Corporate securities 4,102 (15) 1,915 (81) 6,017 (96) Municipal bonds 5,982 (82) — — 5,982 (82) Mortgage-backed securities 7,262 (61) 20,635 (429) 27,897 (490) U.S. Small Business Administration securities 11,876 (162) 1,943 (33) 13,819 (195) Total $ 32,209 $ (331) $ 24,493 $ (543) $ 56,702 $ (874) December 31, 2016 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 $ 6,998 $ (94) $ — $ — $ 6,998 $ (94) Corporate securities 5,048 (106) 1,438 (62) 6,486 (168) Municipal bonds 6,741 (83) — — 6,741 (83) Mortgage-backed securities 39,373 (713) — — 39,373 (713) U.S. Small Business Administration securities 2,963 (41) — — 2,963 (41) Total $ 61,123 $ (1,037) $ 1,438 $ (62) $ 62,561 $ (1,099) There were 21 investments with unrealized losses of less than one year and 17 investments with unrealized losses of more than one year at December 31, 2017. There were 48 investments with unrealized losses of less than one year and two investments with unrealized losses of more than one year at December 31, 2016. 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 these securities, and it is not likely to be required to sell these securities prior to maturity. No other-than-temporary impairment was recorded for the years ended December 31, 2017 and 2016. The contractual maturities of securities available-for-sale at December 31, 2017 and 2016 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. December 31, 2017 December 31, 2016 Amortized Fair Amortized Fair Cost Value Cost Value U.S. agency securities Due after one year through five years $ — $ — $ 4,000 $ 3,956 Due after five years through ten years 4,079 4,124 4,150 4,112 Due after ten years 4,998 4,991 — — Subtotal 9,077 9,115 8,150 8,068 Corporate securities Due after one year through five years 5,117 5,111 5,659 5,625 Due after five years through ten years 1,996 1,915 1,995 1,875 Subtotal 7,113 7,026 7,654 7,500 Municipal bonds Due in one year or less — — 509 513 Due after one year through five years 2,001 2,026 5,326 5,386 Due after five years through ten years 4,111 4,206 7,476 7,492 Due after ten years 6,608 6,554 1,872 1,873 Subtotal 12,720 12,786 15,183 15,264 Mortgage-backed securities Federal National Mortgage Association (“FNMA”) 23,310 23,091 23,522 23,197 Federal Home Loan Mortgage Corporation (“FHLMC”) 10,818 10,629 14,950 14,662 Government National Mortgage Association (“GNMA”) 6,033 6,014 7,384 7,336 Subtotal 40,161 39,734 45,856 45,195 U.S. Small Business Administration securities Due after five years through ten years 12,065 11,896 5,862 5,848 Due after ten years 1,949 1,923 — — Subtotal 14,014 13,819 5,862 5,848 Total $ 83,085 $ 82,480 $ 82,705 $ 81,875 The proceeds and resulting gains and losses, computed using specific identification from sales of securities available-for-sale for the years ended December 31, 2017 and 2016 were as follows: December 31, 2017 Proceeds Gross Gains Gross Losses Securities available-for-sale $ 39,103 $ 413 $ (33) December 31, 2016 Proceeds Gross Gains Gross Losses Securities available-for-sale $ 13,577 $ 149 $ (3)

Loans Receivable and Allowance

Loans Receivable and Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2017
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 December 31: 2017 2016 REAL ESTATE LOANS Commercial $ 63,611 $ 55,871 Construction and development 143,068 94,462 Home equity 25,289 20,081 One-to-four-family (excludes loans held for sale) 163,655 124,009 Multi-family 44,451 37,527 Total real estate loans 440,074 331,950 CONSUMER LOANS Indirect home improvement 130,176 107,759 Solar 41,049 36,503 Marine 35,397 28,549 Other consumer 2,046 1,915 Total consumer loans 208,668 174,726 COMMERCIAL BUSINESS LOANS Commercial and industrial 83,306 65,841 Warehouse lending 41,397 32,898 Total commercial business loans 124,703 98,739 Total loans receivable, gross 773,445 605,415 Allowance for loan losses (10,756) (10,211) Deferred costs, fees, premiums, and discounts, net (1,131) (1,887) Total loans receivable, net $ 761,558 $ 593,317 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 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. 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 (5 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, 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 its market areas. Other Consumer. Loans originated by the Company, including automobiles, recreational vehicles, direct home improvement loans, loans on deposits, and other consumer loans, primarily consisting of personal lines of credit. Commercial Business Loans Commercial and Industrial Lending . 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. Commercial and industrial 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 by the Company’s mortgage and construction warehouse lending program through which the Company funds third-party lenders originating residential mortgage and construction loans for sale into the secondary market and speculative construction loans for residential properties built for sale to single family households. These loans are secured by the notes and assigned deeds of trust associated with the residential mortgage and construction loans on properties primarily located in the Company’s market areas. The following tables detail activities in the allowance for loan losses by loan categories for the years shown: At or For the Year Ended December 31, 2017 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 Provision for loan losses 1,253 884 (638) (749) 750 Charge-offs (65) (832) (33) — (930) Recoveries 35 680 10 — 725 Net charge-offs (30) (152) (23) — (205) Ending balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 Period end amount allocated to: Loans individually evaluated for impairment $ 21 $ 68 $ — $ — $ 89 Loans collectively evaluated for impairment 4,749 2,746 2,014 1,158 10,667 Ending balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 LOANS RECEIVABLE Loans individually evaluated for impairment $ 348 $ 195 $ 551 $ — $ 1,094 Loans collectively evaluated for impairment 439,726 208,473 124,152 — 772,351 Ending balance $ 440,074 $ 208,668 $ 124,703 $ — $ 773,445 At or For the Year Ended December 31, 2016 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 2,874 $ 1,681 $ 1,396 $ 1,834 $ 7,785 Provision for loan losses 622 513 1,192 73 2,400 Charge-offs (65) (1,002) — — (1,067) Recoveries 116 890 87 — 1,093 Net recoveries (charge-offs) 51 (112) 87 — 26 Ending balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 Period end amount allocated to: Loans individually evaluated for impairment $ — $ — $ — $ — $ — Loans collectively evaluated for impairment 3,547 2,082 2,675 1,907 10,211 Ending balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 LOANS RECEIVABLE Loans individually evaluated for impairment $ 194 $ — $ — $ — $ 194 Loans collectively evaluated for impairment 331,756 174,726 98,739 — 605,221 Ending balance $ 331,950 $ 174,726 $ 98,739 $ — $ 605,415 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 for the years ended December 31, 2017 and 2016: December 31, 2017 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 $ — $ — $ — $ — $ 63,611 $ 63,611 $ — Construction and development — — — — 143,068 143,068 — Home equity 122 — 136 258 25,031 25,289 151 One-to-four-family 142 — — 142 163,513 163,655 142 Multi-family — — — — 44,451 44,451 — Total real estate loans 264 — 136 400 439,674 440,074 293 CONSUMER LOANS Indirect home improvement 255 215 99 569 129,607 130,176 195 Solar 49 19 — 68 40,981 41,049 — Marine — — — — 35,397 35,397 — Other consumer — — — — 2,046 2,046 — Total consumer loans 304 234 99 637 208,031 208,668 195 COMMERCIAL BUSINESS LOANS Commercial and industrial — 551 — 551 82,755 83,306 551 Warehouse lending — — — — 41,397 41,397 — Total commercial business loans — 551 — 551 124,152 124,703 551 Total loans $ 568 $ 785 $ 235 $ 1,588 $ 771,857 $ 773,445 $ 1,039 December 31, 2016 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 $ — $ — $ — $ — $ 55,871 $ 55,871 $ — Construction and development — — — — 94,462 94,462 — Home equity 34 — 210 244 19,837 20,081 210 One-to-four-family — — — — 124,009 124,009 — Multi-family — — — — 37,527 37,527 — Total real estate loans 34 — 210 244 331,706 331,950 210 CONSUMER LOANS Indirect home improvement 268 278 167 713 107,046 107,759 435 Solar 92 — 69 161 36,342 36,503 69 Marine 8 — — 8 28,541 28,549 — Other consumer 3 2 4 9 1,906 1,915 7 Total consumer loans 371 280 240 891 173,835 174,726 511 COMMERCIAL BUSINESS LOANS Commercial and industrial — — — — 65,841 65,841 — Warehouse lending — — — — 32,898 32,898 — Total commercial business loans — — — — 98,739 98,739 — Total loans $ 405 $ 280 $ 450 $ 1,135 $ 604,280 $ 605,415 $ 721 There were no loans 90 days or more past due and still accruing interest at December 31, 2017 and 2016. The following tables provide additional information about our impaired loans that have been segregated to reflect loans for which an allowance for credit losses has been provided and loans for which no allowance was provided for the years ended December 31, 2017 and 2016: December 31, 2017 Unpaid Principal Recorded Related Balance Impairment Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 151 $ — $ 151 $ — One-to-four-family 67 (12) 55 — Total real estate loans 218 (12) 206 — Commercial business loans 551 — 551 — 769 (12) 757 — WITH RELATED ALLOWANCE RECORDED One-to-four-family 142 — 142 21 Consumer loans 195 — 195 68 337 — 337 89 Total $ 1,106 $ (12) $ 1,094 $ 89 December 31, 2016 Unpaid Principal Recorded Related Balance Impairment Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 137 $ — $ 137 $ — One-to-four-family 69 (12) 57 — Total $ 206 $ (12) $ 194 $ — The following table presents the average recorded investment in loans individually evaluated for impairment and the interest income recognized and received for the years ended December 31, 2017 and 2016: At or For the Year Ended December 31, 2017 December 31, 2016 Average Recorded Interest Income Average Recorded Interest Income Investment Recognized Investment Recognized WITH NO RELATED ALLOWANCE RECORDED Home equity $ 219 $ — $ 139 $ 1 One-to-four-family 56 3 57 3 Total real estate loans 275 3 196 4 Commercial business loans 551 24 — — 826 27 196 4 WITH RELATED ALLOWANCE RECORDED One-to-four-family 142 4 — — Consumer loans 281 16 — — 423 20 — — Total $ 1,249 $ 47 $ 196 $ 4 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 FDIC’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 graded “4” or “5”internally. Loans that are past due more than 90 days are classified “Substandard” risk graded “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: December 31, 2017 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 62,057 $ — $ 1,554 $ — $ — $ — $ 63,611 Construction and development 143,068 — — — — — 143,068 Home equity 25,138 — — 151 — — 25,289 One-to-four-family 163,513 — — 142 — — 163,655 Multi-family 44,451 — — — — — 44,451 Total real estate loans 438,227 — 1,554 293 — — 440,074 CONSUMER LOANS Indirect home improvement 129,981 — — 195 — — 130,176 Solar 41,049 — — — — — 41,049 Marine 35,397 — — — — — 35,397 Other consumer 1,998 — — 48 — — 2,046 Total consumer loans 208,425 — — 243 — — 208,668 COMMERCIAL BUSINESS LOANS Commercial and industrial 76,942 — 425 5,939 — — 83,306 Warehouse lending 40,724 673 — — — — 41,397 Total commercial business loans 117,666 673 425 5,939 — — 124,703 Total loans $ 764,318 $ 673 $ 1,979 $ 6,475 $ — $ — $ 773,445 December 31, 2016 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 53,234 $ 2,637 $ — $ — $ — $ — $ 55,871 Construction and development 94,462 — — — — — 94,462 Home equity 19,871 — — 210 — — 20,081 One-to-four-family 124,009 — — — — — 124,009 Multi-family 37,527 — — — — — 37,527 Total real estate loans 329,103 2,637 — 210 — — 331,950 CONSUMER LOANS Indirect home improvement 107,324 — — 435 — — 107,759 Solar 36,434 — — 69 — — 36,503 Marine 28,549 — — — — — 28,549 Other consumer 1,813 — — 102 — — 1,915 Total consumer loans 174,120 — — 606 — — 174,726 COMMERCIAL BUSINESS LOANS Commercial and industrial 58,105 525 — 7,211 — — 65,841 Warehouse lending 32,898 — — — — — 32,898 Total commercial business loans 91,003 525 — 7,211 — — 98,739 Total loans $ 594,226 $ 3,162 $ — $ 8,027 $ — $ — $ 605,415 There were no loans and a $43,000 mortgage loan collateralized by residential real estate property in the process of foreclosure at December 31, 2017 and 2016, respectively. Related Party Loans Certain directors and executive officers or their related affiliates are customers of and have had banking transactions with the Company. Total loans to directors, executive officers, and their affiliates are subject to regulatory limitations. Outstanding loan balances were as follows and were within regulatory limitations: At December 31, 2017 2016 Beginning balance $ 313 $ — Additions 351 313 Repayments (9) — Ending balance $ 655 $ 313 The aggregate maximum loan balances of extended credit were $819,000 and $469,000 at December 31, 2017 and 2016, respectively, and includes the ending balances from the tables above. These loans and lines of credit were made in compliance with applicable laws on substantially the same terms (including interest rates and collateral) as those prevailing at the time for comparable transactions with other persons and do not involve more than the normal risk of collectability.

Servicing Rights

Servicing Rights	12 Months Ended
	Dec. 31, 2017
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 loans serviced for others were $778.9 million and $977.1 million at December 31, 2017 and 2016, respectively and are carried at the lower of cost or market. During the year ended December 31, 2017, the Company sold a portion of its MSR with a book value of $4.8 million, generating an associated gain of $1.1 million. The following table summarizes servicing rights activity for the years ended December 31, 2017 and 2016: 2017 2016 Beginning balance $ 8,459 $ 5,811 Additions 5,075 4,194 Sales (4,751) — Servicing rights amortized (1,988) (1,549) Recovery on servicing rights — 3 Ending balance $ 6,795 $ 8,459 The fair market value of the permanent servicing rights’ assets was $8.6 million and $11.7 million at December 31, 2017 and December 31, 2016, 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 MSR at the dates indicated: At December 31, 2017 2016 Key assumptions: Weighted average discount rate 9.5 % 9.5 % Conditional prepayment rate (“CPR”) 10.9 % 8.8 % Weighted average life in years 6.7 7.9 Key economic assumptions and the sensitivity of the current fair value for single family MSR to immediate adverse changes in those assumptions at December 31, 2017 and December 31, 2016 were as follows: December 31, 2017 December 31, 2016 Aggregate portfolio principal balance $ 775,093 $ 973,139 Weighted average rate of note 4.1 % % At December 31, 2017 Base 0.5%Adverse Rate Change 1.0%Adverse Rate Change Conditional prepayment rate 10.9 % 17.7 % 24.5 % Fair value MSR $ 8,602 $ 6,811 $ 5,614 Percentage of MSR 1.1 % 0.9 % 0.7 % Discount rate 9.6 % 10.1 % 10.6 % Fair value MSR $ 8,602 $ 8,433 $ 8,271 Percentage of MSR 1.1 % 1.1 % 1.1 % At December 31, 2016 Base 0.5%Adverse Rate Change 1.0%Adverse Rate Change Conditional prepayment rate 8.8 % 12.8 % 20.2 % Fair value MSR $ 11,735 $ 9,991 $ 7,808 Percentage of MSR 1.2 % 1.0 % 0.8 % Discount rate 9.5 % 10.0 % 10.5 % Fair value MSR $ 11,735 $ 11,480 $ 11,235 Percentage of MSR 1.2 % 1.2 % 1.2 % The above tables show 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 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 as a particular point in time. Those assumptions may not be appropriate if they are applied to a different point in time. The Company recorded $2.2 million and $2.0 million of gross contractually specified servicing fees, late fees, and other ancillary fees resulting from servicing of mortgage and commercial loans for the years ended December 31, 2017 and 2016, respectively. The income, net of amortization, is reported in noninterest income on the Consolidated Statements of Income.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	NOTE 6 - PREMISES AND EQUIPMENT Premises and equipment at December 31, 2017 and 2016 were as follows: 2017 2016 Land $ 2,028 $ 2,028 Buildings 8,611 8,611 Furniture, fixtures, and equipment 10,105 8,826 Leasehold improvements 2,108 2,102 Building improvements 4,545 4,537 Projects in process 189 467 Subtotal 27,586 26,571 Less accumulated depreciation and amortization (12,128) (10,559) Total $ 15,458 $ 16,012 Depreciation and amortization expense for these assets totaled $1.6 million and $1.4 million for the years ended December 31, 2017 and 2016, respectively. The Company leases premises and equipment under operating leases. Minimum net rental commitments under non-cancelable leases, having an original or remaining term of more than one year for future years, were as follows: Years Ending December 31, 2018 $ 1,083 2019 1,019 2020 783 2021 650 2022 541 Thereafter 1,085 Total $ 5,161 Certain leases contain renewal options from five to ten years and escalation clauses based on increases in property taxes and other costs. Rental expense of leased premises and equipment was $1.1 million and $977,000 for the years ended December 31, 2017 and 2016, respectively, which is included in occupancy expense.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Other Real Estate Owned	NOTE 7 - OTHER REAL ESTATE OWNED The following table presents the activity related to OREO at and for the years ended December 31: 2017 2016 Beginning balance $ — $ — Net loans transferred to OREO — 525 Capitalized costs — 7 Gross proceeds from sale of OREO — (682) Gain on sale of OREO — 150 Ending balance $ — $ — At December 31, 2017 and 2016, there were no OREO properties. There were no holding costs associated with OREO for the years ended December 31, 2017 and 2016, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Deposits	NOTE 8 - DEPOSITS Deposits are summarized as follows at December 31: December 31, December 31, 2017 (1) 2016 (1) Noninterest-bearing checking $ 177,739 $ 145,377 Interest-bearing checking 119,872 63,978 Savings 72,082 54,996 Money market (2) 228,742 242,849 Certificates of deposit less than $100,000 (3) 111,489 93,791 Certificates of deposit of $100,000 through $250,000 77,934 74,832 Certificates of deposit of $250,000 and over (4) 32,833 27,094 Escrow accounts related to mortgages serviced 9,151 9,676 Total $ 829,842 $ 712,593 (1) Includes $134.6 million of deposits acquired in the Branch Purchase at December 31, 2017 and $162.2 million at December 31, 2016. (2) Includes $6.5 million of brokered deposits at December 31, 2017 and none at December 31, 2016. (3) Includes $59.3 million and $47.1 million of brokered deposits at December 31, 2017 and 2016, respectively. (4) Time deposits that meet or exceed the FDIC insurance limit. Scheduled maturities of time deposits at December 31, 2017 for future years ending are as follows: At December 31, 2017 Maturing in 2018 $ 108,142 Maturing in 2019 56,047 Maturing in 2020 23,781 Maturing in 2021 16,295 Maturing in 2022 17,969 Thereafter 22 Total $ 222,256 Interest expense by deposit category for the years ended December 31, 2017 and 2016 is as follows: 2017 2016 Interest-bearing checking $ 128 $ 27 Savings and money market 1,260 1,019 Certificates of deposit 2,532 2,208 Total $ 3,920 $ 3,254 The Company had related party deposits of approximately $2.1 million and $976,000 at December 31, 2017 and 2016, respectively, which includes deposits held for directors and executive officers.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	NOTE 9 - DEBT Borrowings The Bank is a member of the FHLB of Des Moines, which entitles it to certain benefits including a variety of borrowing options consisting of a secured credit line that allows both fixed and variable rate advances. The FHLB borrowings at December 31, 2017 and 2016, consisted of a warehouse securities credit line (“securities line”), which allows advances with interest rates fixed at the time of borrowing and a warehouse Federal Funds (“Fed Funds”) advance, which allows daily advances at variable interest rates. Credit capacity is primarily determined by the value of assets collateralized at the FHLB, funds on deposit at the FHLB, and stock owned by the Bank. Credit is limited to 35% of the Company’s total assets. The Bank entered into an Advanced, Pledges and Security Agreement with the FHLB for which specific loans are pledged to secure these credit lines. At December 31, 2017, loans of approximately $318.5 million were pledged to the FHLB with a borrowing capacity, net of advances of $201.0 million. In addition, all FHLB stock owned by the Company is collateral for credit lines. The Bank maintains a short-term borrowing line with the FRB with total credit based on eligible collateral. The Bank can borrow under the Term Auction or Term Facility at rates published by the San Francisco FRB. At December 31, 2017 and 2016, the Bank had approximately $203.3 million in pledged consumer loans with a Term Auction or Term Facility borrowing capacity of $99.1 million and $85.9 million, respectively, of which none was outstanding at either date. The Bank also had $43.0 million unsecured Fed Funds lines of credit with other large financial institutions of which none was outstanding at December 31, 2017. Advances on these lines at December 31, 2017 and 2016 were as follows: 2017 2016 Federal Home Loan Bank - (interest rates ranging from 0.96% to 1.73% and 0.86% to 1.73% at December 31, 2017 and 2016, respectively) $ 7,529 $ 12,670 Total $ 7,529 $ 12,670 Subordinated Note On October 15, 2015 (the “Closing Date”), FS Bancorp, Inc. issued an unsecured subordinated term note in the aggregate principal amount of $10.0 million due October 1, 2025 (the “Subordinated Note”) pursuant to a Subordinated Loan Agreement with Community Funding CLO, Ltd. The Subordinated Note bears interest at an annual interest rate of 6.50%, payable by the Company quarterly in arrears on January 1, April 1, July 1 and October 1 of each year, commencing on the first such date following the Closing Date and on the maturity date. The Subordinated Note will mature on October 1, 2025 but may be prepaid at the Company’s option and with regulatory approval at any time on or after five years after the Closing Date or at any time upon certain events, such as a change in the regulatory capital treatment of the Subordinated Note or the interest on the Subordinated Note no longer being deductible by the Company for United States federal income tax purposes. The Company contributed $9.0 million of the proceeds from the Subordinated Note as additional capital to the Bank in the fourth quarter of 2015 and used the balance to fund general working capital and operating expenses. The maximum and average outstanding and weighted average interest rates on debt during the years ended December 31, 2017 and 2016 were as follows: 2017 2016 Maximum balance: Federal Home Loan Bank advances and Fed Funds $ 70,419 $ 98,769 Federal Reserve Bank $ 1,000 $ 1,000 Fed Funds lines of credit $ 17,501 $ 6,000 Subordinated note $ 10,000 $ 10,000 Average balance: Federal Home Loan Bank advances and Fed Funds $ 25,635 $ 26,259 Federal Reserve Bank $ 3 $ 3 Fed Funds lines of credit $ 876 $ 16 Subordinated note $ 10,000 $ 10,000 Weighted average interest rate: Federal Home Loan Bank advances and Fed Funds 1.26 % 0.98 % Federal Reserve Bank 1.75 % 1.00 % Fed Funds lines of credit 1.30 % 0.77 % Subordinated note 6.50 % 6.50 % Scheduled maturities of Federal Home Loan Bank advances were as follows: Interest Year Ending December 31, Balances Rates 2018 $ 3,986 1.01 % 2019 1,207 1.73 % 2020 2,336 1.71 % 2021 — — % Total $ 7,529

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 10 - 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, 2017, the ESOP paid the sixth annual installment of principal in the amount of $263,000, plus accrued interest of $32,000 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 December 31, 2017 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 years ended December 31, 2017 and 2016, was $1.4 million, and $832,000, respectively. Shares held by the ESOP at December 31, 2017 and December 31, 2016, were as follows (shown as actual): December 31, 2017 2016 Allocated shares 153,049 126,589 Committed to be released shares — — Unallocated shares 103,684 129,605 Total ESOP shares 256,733 256,194 Fair value of unallocated shares (in thousands) $ 5,696 $ 4,158 401(k) Plan The Company has a salary deferral 401(k) Plan covering substantially all of its employees. Employees are eligible to participate in the 401(k) plan at the date of hire if they are 18 years of age. Eligible employees may contribute through payroll deductions and are 100% vested at all times in their deferral contributions account. The Company matches 100% for contributions of 1% to 3%, and 50% for contributions of 4% to 5%. There was a $904,000 and $759,000 matching contribution for the years ended December 31, 2017 and 2016, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
INCOME TAXES
Income Taxes	NOTE 11 - INCOME TAXES The components of income tax expense for the years ended December 31, 2017 and 2016, were as follows: 2017 2016 Provision for income taxes Current $ 7,212 $ 5,398 Deferred (718) 206 Total provision for income taxes $ 6,494 $ 5,604 On December 22, 2017, the U.S. Government enacted the Tax Act. The Tax Act amends the Internal Revenue Code to reduce tax rates and modify policies, credits, and deductions for individuals and businesses. For businesses, the Tax Act reduces the corporate federal income tax rate from a maximum of 35% to a flat 21% rate. The corporate income tax rate reduction was effective January 1, 2018. The Tax Act required a revaluation the Company’s deferred tax assets and liabilities to account for the future impact of lower corporate tax rates and other provisions of the legislation. As a result of the Company’s revaluation, the Company recognized $396,000 in tax benefit due to a net deferred tax liability position. A reconciliation of the effective income tax rate with the federal statutory tax rates at December 31, 2017 and 2016 was as follows: 2017 2016 Amount Rate Amount Rate Income tax provision at statutory rate $ 7,203 35.0 % $ 5,636 35.0 % Tax exempt income (218) (1.0) (255) (1.6) Decrease in tax resulting from other items (487) (2.4) 42 0.3 Income tax rate differential (396) (1.9) — — ESOP 392 1.9 181 1.1 Total $ 6,494 31.6 % $ 5,604 34.8 % Total deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows: 2017 2016 Deferred Tax Assets Allowance for loan losses $ 1,912 $ 2,467 Non-accrued loan interest 9 3 Non-qualified stock options — 159 Securities available-for-sale 130 294 Other 210 437 Total deferred tax assets 2,261 3,360 Deferred Tax Liabilities Loan origination costs (870) (1,242) Servicing rights (1,461) (3,003) Prepaids (52) (72) Stock dividend - FHLB stock (1) (1) Property, plant, and equipment (484) (203) Total deferred tax liabilities (2,868) (4,521) Net deferred tax liabilities $ (607) $ (1,161) The Company files a U.S. Federal income tax return and Oregon State return, which are subject to examination by tax authorities for years 2014 and later. At December 31, 2017 and 2016, the Company had no uncertain tax positions. The Company recognizes interest and penalties in tax expense and at December 31, 2017 and 2016, the Company recognized no interest and penalties.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 12 - 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 December 31, 2017 and 2016: 2017 2016 COMMITMENTS TO EXTEND CREDIT REAL ESTATE LOANS Commercial $ 107 $ 108 Construction and development 73,321 57,016 One-to-four-family (includes locks for salable loans) 37,336 36,623 Home equity 32,889 26,129 Multi-family 438 426 Total real estate loans 144,091 120,302 CONSUMER LOANS 10,041 8,527 COMMERCIAL BUSINESS LOANS Commercial and industrial 52,452 31,774 Warehouse lending 78,303 51,102 Total commercial business loans 130,755 82,876 Total commitments to extend credit $ 284,887 $ 211,705 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 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 $253,000 and $179,000 at December 31, 2017 and 2016, respectively. 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 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 December 31, 2017, the total loans sold to the FHLB were $39.3 million with the FLA being $433,000 and the CE obligation at $1.1 million or 2.7% of the loans outstanding. Management has established a holdback of 10% of the outstanding CE, or $121,000, 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 December 31, 2017 and December 31, 2016. 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 reserves of $1.0 million and $955,000 to cover loss exposure related to these guarantees for one-to-four-family loans sold into the secondary market at December 31, 2017 and 2016, respectively, which is included in other liabilities in 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 their 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, 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 1.6483 when all litigation pending as of the date of the IPO is concluded. However, at December 31, 2017, 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 December 31, 2017 and December 31, 2016 was $114.02 per share and $77.73 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 December 31, 2017.

Significant Concentration of Cr

Significant Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Significant Concentration of Credit Risk	NOTE 13 - SIGNIFICANT CONCENTRATION OF CREDIT RISK Most of the Company’s business and lending activities are primarily with customers located in the greater Puget Sound area and one loan production office located in the Tri-Cities, Washington. The Company originates real estate and consumer loans and has concentrations in these areas, however, indirect home improvement loans are originated through a network of home improvement contractors and dealers located throughout Washington, Oregon, California, Idaho, and Colorado. The Company also originates solar loans through contractors and dealers in the state of California. Generally, loans are secured by deposit accounts, personal property, or real estate. 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.

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Capital	NOTE 14 - REGULATORY CAPITAL The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s 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, and Tier 1 leverage ratios as set forth in the table below to be categorized as well capitalized. At December 31, 2017 and December 31, 2016, 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 December 31, 2017, that the Company and the Bank met all capital adequacy requirements. The following table compares the Bank’s actual capital amounts and ratios at December 31, 2017 and 2016 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 December 31, 2017 Total risk-based capital (to risk-weighted assets) $ 133,967 16.25 % $ 65,965 8.00 % $ 76,272 9.25 % $ 82,456 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 123,651 15.00 % $ 49,474 6.00 % $ 59,781 7.25 % $ 65,965 8.00 % Tier 1 leverage capital (to average assets) $ 123,651 12.61 % $ 39,233 4.00 % N/A N/A $ 49,041 5.00 % CET 1 capital (to risk-weighted assets) $ 123,651 15.00 % $ 37,105 4.50 % $ 47,412 5.75 % $ 53,597 6.50 % At December 31, 2016 Total risk-based capital (to risk-weighted assets) $ 93,309 13.87 % $ 53,813 8.00 % $ 58,051 8.63 % $ 67,266 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 84,876 12.62 % $ 40,360 6.00 % $ 44,597 6.63 % $ 53,813 8.00 % Tier 1 leverage capital (to average assets) $ 84,876 10.33 % $ 32,862 4.00 % N/A N/A $ 41,078 5.00 % CET 1 capital (to risk-weighted assets) $ 84,876 12.62 % $ 30,270 4.50 % $ 34,508 5.13 % $ 43,723 6.50 % In addition to the minimum CET 1, Tier 1, total capital, and leverage ratios, the Bank now has to maintain a capital conservation buffer consisting of additional CET 1 capital 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. The capital conservation buffer requirement began to be phased-in on January 1, 2016 when more than 0.625% of risk-weighted assets was required, and increases by 0.625% on each subsequent January 1, until fully implemented to an amount equal to 2.5% of risk-weighted assets in January 2019. At December 31, 2017, the Bank’s CET1 capital exceeded the required capital conservation buffer of 1.25%. FS Bancorp, Inc. is a bank holding company subject to the 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 $1.0 billion in assets, the capital guidelines apply on a bank only basis and the Federal Reserve expects the holding company’s subsidiary banks to be well capitalized under the prompt corrective action regulations. If FS Bancorp Inc. was subject to regulatory guidelines for bank holding companies with $1.0 billion or more in assets, at December 31, 2017, the Company would have exceeded all regulatory capital requirements. The regulatory capital ratios calculated for FS Bancorp Inc. at December 31, 2017 were 12.1% for Tier 1 leverage-based capital, 14.5% for Tier 1 risk-based capital, 15.7% for total risk-based capital, and 14.5% for CET 1 capital ratio.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	NOTE 15 - FAIR VALUE OF FINANCIAL INSTRUMENTS The Company assumes interest rate risk (the risk that general interest rate levels will change) as a result of its normal operations. Consequently, the fair value of the Company’s consolidated financial instruments will change when interest rate levels change and that change may either be favorable or unfavorable to the Company. Management attempts to match maturities of assets and liabilities to the extent believed necessary to minimize interest rate risk. However, borrowers with fixed interest rate obligations are less likely to prepay in a rising interest rate environment and more likely to prepay in a falling interest rate environment. Conversely, depositors who are receiving fixed interest rates are more likely to withdraw funds before maturity in a rising interest rate environment and less likely to do so in a falling interest rate environment. Management monitors interest rates and maturities of assets and liabilities, and attempts to minimize interest rate risk by adjusting terms of new loans, and deposits, and by investing in securities with terms that mitigate the Company’s overall interest rate risk. Accounting guidance regarding fair value measurements defines fair value and establishes a framework for measuring fair value in accordance with U.S. GAAP. Fair value is the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. 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. Determination of Fair Market Values: 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 To Be Announced (“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 using 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 result in a discount to the overall cashflows to be received (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 December 31, 2017 U.S. agency securities $ — $ 9,115 $ — $ 9,115 Corporate securities — 7,026 — 7,026 Municipal bonds — 12,786 — 12,786 Mortgage-backed securities — 39,734 — 39,734 U.S. Small Business Administration securities — 13,819 — 13,819 Total $ — $ 82,480 $ — $ 82,480 Securities Available-for-Sale Level 1 Level 2 Level 3 Total At December 31, 2016 U.S. agency securities $ — $ 8,068 $ — $ 8,068 Corporate securities — 7,500 — 7,500 Municipal bonds — 15,264 — 15,264 Mortgage-backed securities — 45,195 — 45,195 U.S. Small Business Administration securities — 5,848 — 5,848 Total $ — $ 81,875 $ — $ 81,875 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 December 31, 2017 $ — $ 53,463 $ — $ 53,463 December 31, 2016 $ — $ 52,553 $ — $ 52,553 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 December 31, 2017 $ — $ — $ 726 $ 726 December 31, 2016 $ — $ — $ 818 $ 818 Individual Forward Sale Commitments with Investors Level 1 Level 2 Level 3 Total December 31, 2017 $ — $ (65) $ 51 $ (14) December 31, 2016 $ — $ 495 $ 177 $ 672 Paired Off Commitments with Investors Level 1 Level 2 Level 3 Total December 31, 2017 $ — $ 53 $ — $ 53 December 31, 2016 $ — $ 747 $ — $ 747 The following table presents impaired loans measured at fair value on a nonrecurring basis for which a nonrecurring change in fair value has been recorded during the reporting period. 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 December 31, 2017 $ — $ — $ 1,094 $ 1,094 December 31, 2016 $ — $ — $ 194 $ 194 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 December 31, 2017: Significant Range Weighted Level 3 Fair Value Instrument Valuation Technique Unobservable Inputs (Weighted Average) Average RECURRING Interest rate lock commitments with customers Quoted market prices Pull-through expectations 80% - 99% 94.8 % Individual forward sale commitments with investors Quoted market prices Pull-through expectations 80% - 99% 94.8 % NONRECURRING Impaired loans Fair value of underlying collateral Discount applied to the obtained appraisal 0% - 18.0% — % 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 years ended December 31, 2017 and 2016. 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 year 2017 Interest rate lock commitments with customers $ 818 $ 14,319 $ (14,411) $ 726 $ (92) Individual forward sale commitments with investors 177 141 (267) 51 (126) 2016 Interest rate lock commitments with customers $ 698 $ 16,793 $ (16,673) $ 818 $ 120 Individual forward sale commitments with investors 74 175 (72) 177 103 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 Values of Financial Instruments - The following methods and assumptions were used by the Company in estimating the fair values of financial instruments disclosed in these financial statements: Cash, and Cash Equivalents and Certificates of Deposit at Other Financial Institutions - The carrying amounts of cash and short-term instruments approximate their fair value (Level 1). Federal Home Loan Bank Stock - The par value of FHLB stock approximates its fair value (Level 2). Bank-owned Life Insurance - The estimated fair value is equal to the cash surrender value of policies, net of surrender charges (Level 1). Accrued Interest - The carrying amounts of accrued interest approximate its fair value (Level 2). Loans Receivable, Net - For variable rate loans that re-price frequently and have no significant change in credit risk, fair values are based on carrying values. Fair values for fixed rate loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers or similar credit quality (Level 3). Servicing Rights - The fair value of mortgage, commercial, and consumer 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). 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 a discounted cash flow calculation on interest rates currently offered on similar certificates (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). Off-Balance Sheet Instruments - The fair value of commitments to extend credit are estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreement and the present creditworthiness of the customers. The majority of the Company’s off-balance-sheet instruments consist of non-fee producing, variable-rate commitments, the Company has determined they do not have a distinguishable fair value. The fair value of loan lock commitments with customers and investors reflect an estimate of value based upon the interest rate lock date, the expected pull through percentage for the commitment, and the interest rate at year end (Level 2 and 3). The following table provides estimated fair values of the Company’s financial instruments at December 31, 2017 and 2016, whether or not recognized at fair value in the Consolidated Balance Sheets: 2017 2016 Carrying Fair Carrying Fair Amount Value Amount Value Financial Assets Level 1 inputs: Cash and cash equivalents $ 18,915 $ 18,915 $ 36,456 $ 36,456 Certificates of deposit at other financial institutions 18,108 18,108 15,248 15,248 Level 2 inputs: Securities available-for-sale, at fair value 82,480 82,480 81,875 81,875 Loans held for sale, at fair value 53,463 53,463 52,553 52,553 FHLB stock, at cost 2,871 2,871 2,719 2,719 Accrued interest receivable 3,566 3,566 2,524 2,524 Individual forward sale commitments with investors — — 495 495 Paired off commitments with investors 53 53 747 747 Level 3 inputs: Loans receivable, gross 773,445 780,551 605,415 617,630 Servicing rights, held at lower of cost or fair value 6,795 8,608 8,459 11,741 Fair value interest rate locks with customers 726 726 818 818 Individual forward sale commitments with investors 51 51 177 177 Financial Liabilities Level 2 inputs: Deposits 829,842 838,087 712,593 718,970 Borrowings 7,529 7,498 12,670 12,660 Subordinated note 9,845 10,741 9,825 9,805 Accrued interest payable 214 214 192 192 Paired off commitments with investors 65 65 — —

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 16 - 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 year. 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 years ended December 31, 2017 and 2016. At or For the Year Ended December 31, Numerator: 2017 2016 Net income (in thousands) $ 14,085 $ 10,499 Denominator: Basic weighted average common shares outstanding 3,094,586 2,896,209 Dilutive shares 197,114 93,950 Diluted weighted average common shares outstanding 3,291,700 2,990,159 Basic earnings per share $ 4.55 $ 3.63 Diluted earnings per share $ 4.28 $ 3.51

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	NOTE 17 - 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 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: December 31, 2017 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 31,951 $ 726 $ — Mandatory and best effort forward commitments with investors 12,505 51 — Forward TBA mortgage-backed securities 66,500 — 65 TBA mortgage-backed securities forward sales paired off with investors 36,500 53 — December 31, 2016 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 33,289 $ 818 $ — Mandatory and best effort forward commitments with investors 23,536 177 — Forward TBA mortgage-backed securities 53,000 495 — TBA mortgage-backed securities forward sales paired off with investors 44,000 747 — At December 31, 2017 and 2016, the Company had $66.5 million and $53.0 million of TBA trades with counterparties that required margin collateral of $75,000 and none, respectively. 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 a net gain of $2.3 million and $3.1 million for the years ended December 31, 2017 and 2016, respectively.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	NOTE 18 - STOCK-BASED COMPENSATION Stock Options and Restricted Stock In September 2013, the shareholders of FS Bancorp, Inc. approved the FS Bancorp, Inc. 2013 Equity Incentive Plan (“Plan”). The Plan provides for the grant of stock options and restricted stock awards. Total share-based compensation expense for the Plan was $634,000 for the year ended December 31, 2017, and $783,000 for the year ended December 31, 2016. The related income tax benefit was $222,000 for the year ended December 31, 2017, and $274,000 for 2016. Stock Options The Plan authorizes the grant of stock options totaling 324,013 shares to Company directors and employees in which 322,000 option share awards under the Plan 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. These option awards were granted as non-qualified stock options, having a vesting period of five years, with 20% vesting on the anniversary date of each grant date, and a contractual life of 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 December 31, 2017, 6,013 option share awards are available to be granted. 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 became a publicly held company in July 2012, therefore historical data was not available to calculate the volatility for FS Bancorp stock. Instead, management utilized the NASDAQ Bank Index, or NASDAQ Bank (NASDAQ symbol: BANK) to determine the expected volatility of FS Bancorp’s stock at grant date for the majority of stock options granted in 2014. This index provides the volatility of the banking sector for NASDAQ traded banks. The majority of smaller banks are traded on the NASDAQ given the costs and daily interaction required with trading on the New York Stock Exchange. The Company utilized the comparable Treasury rate for the discount rate associated with the stock options granted. 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 plan awards during the year ended December 31, 2017 (shown as actual): Weighted-Average Weighted- Remaining Average Contractual Term In Aggregate Shares Exercise Price Years Intrinsic Value Outstanding at January 1, 2017 295,850 $ 16.89 7.36 $ 5,638,901 Granted — — — — Less exercised 39,613 $ 16.89 — $ 1,113,997 Forfeited or expired — — — — Outstanding at December 31, 2017 256,237 $ 16.89 6.36 $ 9,655,010 Expected to vest, assuming a 0.31% annual forfeiture rate (1) 255,902 $ 16.89 6.36 $ 9,642,373 Exercisable at December 31, 2017 129,437 $ 16.89 6.36 $ 4,877,186 (1) Forfeiture rate has been calculated and estimated to assume a forfeiture of 1/32 over the 10-year contractual life, or 3.1% of the options forfeited over 10 years. At December 31, 2017, there was $311,000 of total unrecognized compensation cost related to nonvested stock options granted under the Plan. The cost is expected to be recognized over the remaining weighted-average vesting period of 1.4 years. The total intrinsic value of options exercised for the years ended December 31, 2017 and 2016 was $1.1 million and $106,000, respectively. Restricted Stock Awards The Plan authorizes the grant of restricted stock awards totaling 129,605 shares to Company directors 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 restricted stock awards were granted on January 1, 2016 at a grant date fair value of $26.00 per share. Compensation expense is recognized over the vesting period of the awards based on the fair value of the restricted stock. The restricted stock awards’ fair value is equal to the value on the grant date. Shares awarded as restricted stock vest ratably over a three-year period for directors and a five-year period for employees, beginning at the grant date. Any unvested restricted stock awards 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 year ended December 31, 2017 (shown as actual): Weighted-Average Grant-Date Fair Value Nonvested Shares Shares Per Share Nonvested at January 1, 2017 68,763 $ 17.49 Granted — — Less vested 31,921 $ 17.32 Forfeited or expired — — Nonvested at December 31, 2017 36,842 $ 17.63 At December 31, 2017, there was $427,000 of total unrecognized compensation costs related to nonvested shares granted as restricted stock awards. The cost is expected to be recognized over the remaining weighted-average vesting period of 1.3 years. The total fair value of shares vested for the years ended December 31, 2017 and 2016 was $1.4 million and $761,000, respectively.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segments	NOTE 19 - 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, ATMs, 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 on residential and multi-family construction, and commercial business loans. At December 31, 2017, our retail deposit branch network consisted of 11 branches in the Pacific Northwest. At December 31, 2017 and December 31, 2016, our deposits totaled $829.8 million and $712.6 million, 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. 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 years ended December 31, 2017 and 2016: At or For the Year Ended December 31, 2017 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 2,587 $ 38,661 $ 41,248 Provision for loan losses (287) (463) (750) Noninterest income 18,973 5,101 24,074 Noninterest expense (17,052) (26,941) (43,993) Income before provision for income taxes 4,221 16,358 20,579 Provision for income taxes (1,332) (5,162) (6,494) Net income $ 2,889 $ 11,196 $ 14,085 Total assets $ 220,353 $ 761,430 $ 981,783 Total average assets at year end $ 203,379 $ 720,202 $ 923,581 FTEs 119 207 326 At or For the Year Ended December 31, 2016 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 2,221 $ 31,636 $ 33,857 Provision for loan losses (208) (2,192) (2,400) Noninterest income 19,195 4,374 23,569 Noninterest expense (14,944) (23,979) (38,923) Income before provision for income taxes 6,264 9,839 16,103 Provision for income taxes (2,180) (3,424) (5,604) Net income $ 4,084 $ 6,415 $ 10,499 Total assets $ 184,003 $ 643,923 $ 827,926 Total average assets at year end $ 153,812 $ 645,208 $ 799,020 FTEs 112 194 306 (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.

Basis of Presentation and Sum28

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Financial Statement Presentation	Financial Statement Presentation - The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and with prevailing practices within the banking and securities industries. In preparing such financial statements, management is required to make certain estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the balance sheet and the reported amounts of revenues and expenses for the reporting period. Actual results could differ significantly from those 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 in thousands of dollars except per share amounts. In the narrative footnote discussion, amounts are rounded and presented in millions of dollars to one decimal point if the amounts are above $1.0 million. Amounts below $1.0 million are rounded and presented in dollars to the nearest thousands. Certain prior year amounts have been reclassified to conform to the 2017 presentation with no change to consolidated net income or stockholders’ equity previously reported.
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 19 – Business Segments”.
Subsequent Events	Subsequent Events - The Company has entered into a five year lease with two five year option renewals for a new retail branch location in Silverdale, Washington, expected to open in April 2018.
Cash and Cash Equivalents	Cash and Cash Equivalents - Cash and cash equivalents include cash and due from banks, and interest-bearing balances due from other banks and the Federal Reserve Bank of San Francisco (“FRB”) and have a maturity of 90 days or less at the time of purchase. At times, cash balances may exceed Federal Deposit Insurance Corporation (“FDIC”) insured limits. At December 31, 2017 and 2016, the Company had $15,000 and $7.8 million, respectively, of cash and due from banks and interest-bearing deposits at other financial institutions in excess of FDIC insured limits. Because the Company places these deposits with major financial institutions and monitors the financial condition of these institutions, management believes the risk of loss to any deposits in excess of FDIC limits to be minimal.
Derivatives	Derivatives - Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as free-standing derivatives. The fair value of the interest rate lock is recorded at the time the commitment to fund the mortgage loan is executed and is adjusted for the expected exercise of the commitments to fund the loans, the Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered. Fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates from the date the interest on the loan is locked. Changes in the fair values of these derivatives are reported in “Gain on sale of loans” on the Consolidated Statements of Income.
Employee Stock Ownership Plan	Employee Stock Ownership Plan ( “ ESOP ” ) - Compensation expense recognized for the Company’s ESOP equals the fair value of shares that have been allocated or committed to be released for allocation to participants. Any difference between the fair value of the shares at the time and the ESOP’s original acquisition cost is charged or credited to stockholders’ equity (additional paid-in capital). The cost of ESOP shares that have not yet been allocated or committed to be released is deducted from stockholders’ equity.
Use of Estimates	In preparing such financial statements, management is required to make certain estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the balance sheet and the reported amounts of revenues and expenses for the reporting period. Actual results could differ significantly from those 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.
Securities Available-for-Sale	Securities Available-for-Sale - Securities available-for-sale consist of debt securities that the Company has the intent and ability to hold for an indefinite period, but not necessarily to maturity. Such securities may be sold to implement the Company’s asset/liability management strategies and in response to changes in interest rates and similar factors. Securities available-for-sale are reported at fair value. Realized gains and losses on securities available-for-sale, determined using the specific identification method, are included in results of operations. Amortization of premium and accretion of discounts are recognized in interest income over the period to maturity. Unrealized holding gains and losses, net of the related deferred tax effect, are reported as a net amount in a separate component of equity entitled accumulated other comprehensive income. Unrealized losses that are deemed to be other than temporary are reflected in results of operations. Any declines in the values of these securities that are considered to be other-than-temporary-impairment (“OTTI”) and credit-related are recognized in earnings. Noncredit-related OTTI on securities not expected to be sold is recognized in other comprehensive income. The review for OTTI is conducted on an ongoing basis and takes into account the severity and duration of the impairment, recent events specific to the issuer or industry, fair value in relationship to cost, extent and nature of change in fair value, creditworthiness of the issuer including external credit ratings and recent downgrades, trends and volatility of earnings, current analysts’ evaluations, and other key measures. In addition, the Company does not intend to sell the securities and it is more likely than not that we will not be required to sell the securities before recovery of their amortized cost basis. In doing this, we take into account our balance sheet management strategy and consideration of current and future market conditions. Dividends and interest income are recognized when earned.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock - The Bank’s investment in FHLB stock is carried at cost, which approximates fair value. As a member of the FHLB system, the Bank is required to maintain an investment in capital stock of the FHLB in an amount of $994,000 and 4.0% of advances from the FHLB. The Bank’s required minimum level of investment in FHLB stock is based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. At December 31, 2017 and 2016, the Bank’s minimum level of investment requirement in FHLB stock was $2.9 million and $2.7 million, respectively. The Bank was in compliance with the FHLB minimum investment requirement at December 31, 2017 and 2016. Management evaluates FHLB stock for impairment as needed. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared with the capital stock amount for the FHLB and the length of time this situation has persisted; (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB; (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB; and (4) the liquidity position of the FHLB. Based on its evaluation, management determined that there was no impairment of FHLB stock at December 31, 2017 and 2016, respectively.
Loans Held for Sale	Loans Held for Sale - The Bank records all mortgage loans held-for-sale at fair value. Fair value is determined by outstanding commitments from investors or current investor yield requirements calculated on the aggregate loan basis. Origination fees and costs are recognized in earnings at the time of origination. Mortgage loans held-for-sale are sold with the mortgage service rights either released or retained by the Bank. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold. All sales are made with limited recourse against the Company.
Loans Receivable	Loans Receivable - Loans receivable, are stated at the amount of unpaid principal reduced by an allowance for loan losses and net deferred fees or costs. Interest on loans is calculated using the simple interest method based on the daily balance of the principal amount outstanding and is credited to income as earned. Loan fees, net of direct origination costs, are deferred and amortized over the life of the loan using the effective yield method. Interest on loans is accrued daily based on the principal amount outstanding. Generally, the accrual of interest on loans is discontinued when, in management’s opinion, the borrower may be unable to meet payments as they become due or when they are past due 90 days as to either principal or interest (based on contractual terms), unless they are well secured and in the process of collection. All interest accrued but not collected for loans that are placed on non-accrual status or charged off are reversed against interest income. Subsequent collections on a cash basis are applied proportionately to past due principal and interest, unless collectability of principal is in doubt, in which case all payments are applied to principal. Loans are returned to accrual status when the loan is deemed current, and the collectability of principal and interest is no longer doubtful, or, generally, when the loan is less than 90 days delinquent, and performing according to its contractual terms after a period of six months performance. The Company charges fees for originating loans. These fees, net of certain loan origination costs, are deferred and amortized to income, on the level-yield basis, over the loan term. If the loan is repaid prior to maturity, the remaining unamortized net deferred loan origination fee is recognized in income at the time of repayment.
Impaired Loans	Impaired Loans - A loan is considered impaired when it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with the original or modified terms of the loan agreement. Impaired loans are measured on a loan by loan basis based on the estimated fair value of the collateral less estimated cost to sell if the loan is considered collateral dependent. Impaired loans not considered to be collateral dependent are measured based on the present value of expected future cash flows. Impairment is measured for each loan in the portfolio except for the smaller groups of homogeneous consumer loans. The categories of non-accrual loans and impaired loans overlap, although they are not coextensive. The Company considers all circumstances regarding the loan and borrower on an individual basis when determining whether an impaired loan should be placed on non-accrual status, such as the financial strength of the borrower, the collateral value, reasons for delay, payment record, the amount of past due and the number of days past due. Loans that experience insignificant payment delays and payment shortfalls are generally not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of shortfall in relation to the principal and interest owed.
Allowance for Loan Losses	Allowance for Loan Losses - The allowance for loan losses is maintained at a level considered adequate to provide for probable losses on existing loans based on evaluating known and inherent risks in the loan portfolio. The allowance is reduced by loans charged off and increased by provisions charged to earnings and recoveries on loans previously charged-off. The allowance is based on management’s periodic, systematic evaluation of factors underlying the quality of the loan portfolio including changes in the size and composition of the loan portfolio, the estimated value of any underlying collateral, actual loan loss experience, current economic conditions, and detailed analysis of individual loans for which full collectability may not be assured. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. While management uses the best information available to make its estimates, future adjustments to the allowance may be necessary if there is a significant change in economic and other conditions. The appropriateness of the allowance for loan losses is estimated based on these factors and trends identified by management at the time the financial statements are prepared. When available information confirms that specific loans or portions thereof are uncollectible, these amounts are charged-off against the allowance for loan losses. The existence of some or all of the following criteria will generally confirm that a loss has been incurred: the loan is significantly delinquent and the borrower has not evidenced the ability or intent to bring the loan current; the Company has no recourse to the borrower, or if it does, the borrower has insufficient assets to pay the debt; the estimated fair value of the loan collateral is significantly below the current loan balance, and there is little or no near-term prospect for improvement. A provision of loan losses is charged against income and added to the allowance for loan losses based on regular assessment of the loan portfolio. The allowance for loan losses is allocated to certain loan categories based on the relative risk characteristics, asset classifications, and actual loss experience within the loan portfolio. Although management has allocated the allowance for loan losses to various loan portfolio segments, the allowance is general in nature and is available for the loan portfolio in its entirety. The ultimate recovery of all loans is susceptible to future market factors beyond the Company’s control. These factors may result in losses or recoveries differing significantly from those provided for in the financial statements. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations.
Reserve for Unfunded Loan Commitments	Reserve for Unfunded Loan Commitments - The reserve for unfunded loan commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to these unfunded credit facilities. The determination of the adequacy of the reserve is based on periodic evaluations of the unfunded credit facilities including an assessment of the probability of commitment usage, credit risk factors for loans outstanding to these same customers, and the terms and expiration dates of the unfunded credit facilities. The reserve for unfunded loan commitments is included in other liabilities on the consolidated balance sheet, with changes to the balance charged against noninterest expense.
Premises and Equipment, Net	Premises and Equipment, Net - Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. The estimated useful lives used to compute depreciation include building and building improvements from 25 to 40 years and furniture, fixtures, and equipment from 3 to 10 years. Leasehold and tenant improvements are amortized using the straight-line method over the lesser of useful life or the life of the related lease. Gains or losses on dispositions are reflected in results of operations. Management reviews buildings, improvements and equipment for impairment on an annual basis or whenever events or changes in the circumstances indicate that the undiscounted cash flows for the property are less than its carrying value. If identified, an impairment loss is recognized through a charge to earnings based on the fair value of the property.
Transfers of Financial Assets and Servicing Rights	Transfers of Financial Assets - Transfers of an entire financial asset, a group of entire financial assets, or participating interest in an entire financial asset are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Servicing Rights - Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Generally, purchased servicing rights are capitalized at the cost to acquire the rights. For sales of mortgage, commercial and consumer loans, a portion of the cost of originating the loan is allocated to the servicing right based on relative fair value. Fair value is based on market prices for comparable mortgage, commercial, or consumer servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, and default rates and losses. Servicing assets are evaluated quarterly for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights into tranches based on predominant characteristics, such as interest rate, loan type, and investor type. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranches. If the Company later determines that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the allowance may be recorded as an increase to income. Capitalized servicing rights are stated separately on the consolidated balance sheets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets.
Income Taxes	Income Taxes - The Company files a consolidated federal income tax return. Deferred federal income taxes result from temporary differences between the tax basis of assets and liabilities, and their reported amounts in the financial statements. These will result in differences between income for tax purposes and income for financial reporting purposes in future years. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. Valuation allowances are established to reduce the net recorded amount of deferred tax assets if it is determined to be more likely than not, that all or some portion of the potential deferred tax asset will not be realized. The Financial Accounting Standards Board (“FASB”) issued guidance related to accounting for uncertainty in income taxes. The guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. It is the Company’s policy to record any penalties or interest arising from federal or state taxes as a component of income tax expense.
Earnings Per Share	Earnings Per Share - Basic earnings per share (“EPS”) are computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. For purposes of computing basic and dilutive EPS, ESOP shares that have been committed to be released are outstanding and ESOP shares that have not been committed to be released shall not be considered outstanding.
Comprehensive Income (Loss)	Comprehensive Income (Loss) - Comprehensive income (loss) is comprised of net income and other comprehensive income (loss). Other comprehensive income (loss) includes items recorded directly to equity, such as unrealized holding gains and losses on securities available-for-sale.
Financial Instruments	Financial Instruments - In the ordinary course of business, the Company has entered into agreements for off-balance-sheet financial instruments consisting of commitments to extend credit and stand-by letters of credit. Such financial instruments are recorded in the financial statements when they are funded or related fees are incurred or received.
Restricted Assets	Restricted Assets - Federal Reserve regulations require that the Bank maintain reserves in the form of cash on hand and deposit balances with the FRB, based on a percentage of deposits. The amounts of such balances for the years ended December 31, 2017 and 2016 were $18.2 million and $10.7 million, respectively, included in interest-bearing deposits at other financial institutions on the balance sheet.
Marketing and Advertising Costs	Marketing and Advertising Costs - The Company records marketing and advertising costs as expenses as they are incurred. Total marketing and advertising expense was $716,000 and $710,000 for the years ended December 31, 2017 and 2016, respectively.
Stock-Based Compensation	Stock-Based Compensation - Compensation cost is recognized for stock options and restricted stock awards, based on the fair value of these awards at the grant date. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the grant date is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award.
Goodwill	Goodwill - Goodwill is recorded upon completion of a business combination as the difference between the purchase price and the fair value of net identifiable assets acquired. Goodwill was not recorded until the first quarter of 2016 in recognition of the four retail branches purchased from Bank of America. Subsequent to initial recognition, the Company tests goodwill for impairment during the fourth quarter of each fiscal year, or more often if events or circumstances, such as adverse changes in the business climate indicate there may be impairment. There was no goodwill impairment at December 31, 2017 or December 31, 2016.
Application of New Accounting Guidance	Application of New Accounting Guidance On October 1, 2017, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2017‑04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to simplify the subsequent measurement of goodwill and the amendment eliminates Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. The Company still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The application of this ASU did not have a material impact on the Company’s consolidated financial statements. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Cuts and Jobs Act of 2017 (the “Tax Act”). SAB 118 provides guidance to registrants under three scenarios: (1) Measurement of certain income tax effects is complete, (2) Measurement of certain income tax effects can be reasonably estimated and (3) Measurement of certain income tax effects cannot be reasonably estimated. SAB 118 provides a one year measurement period for the registrant to complete its accounting for certain income tax effects that are considered provisional or for which reasonable estimates cannot be made. The Company recognized the income tax effects of the 2017 Tax Act in its 2017 financial statements in accordance with SAB 118.
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU No. 2014‑09, Revenue from Contracts with Customers (Topic 606), which creates Topic 606 and supersedes Topic 605, Revenue Recognition. In August 2015, FASB issued ASU No. 2015‑14, Revenue from Contracts with Customers (Topic 606) , which postponed the effective date of 2014‑09. The core principle of Topic 606 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In general, the new guidance requires companies to use more judgment and make more estimates than under current guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The ASU is effective for public entities for interim and annual periods beginning after December 15, 2017; early adoption is not permitted. For financial reporting purposes, the ASU allows for either full retrospective adoption, meaning the ASU is applied to all of the periods presented, or modified retrospective adoption, meaning the ASU is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. As a bank holding company, key revenue sources, such as interest income have been identified as out of the scope of this new guidance. The Company’s analysis suggests that the adoption of this accounting standard is not expected to have a material impact on the Company’s consolidated financial statements as substantially all of the Company’s revenues are excluded from the scope of the new guidance. The Company plans to adopt the new guidance on January 1, 2018, utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016‑01, Financial Instruments - Overall (Subtopic 825‑10), Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance is intended to improve the recognition and measurement of financial instruments. This ASU requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. In addition, the amendments in this ASU require the exit price notion be used when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. This ASU also eliminates the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. The ASU also requires a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. ASU No. 2016‑01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted for certain provisions. The adoption of ASU No. 2016-01 is not expected to have a material impact on the Company’s consolidated financial statements and the Company is implementing processes and procedures to ensure it is fully compliant with the disclosures requirements of this ASU related to fair value of its financial instruments beginning with the quarterly reporting period as of March 31, 2018. In February 2016, FASB issued 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 a right-of-use 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 a finance lease, interest payments should be recognized separately from amortization of the right-of-use asset in the statement of comprehensive income. For operating leases, the lease cost should be allocated over the lease term on a generally straight-line basis. The amendments in ASU 2016‑02 are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application of the amendments in the ASU is permitted. Once adopted, we expect to report higher assets and liabilities as a result of including right-of-use assets and lease liabilities related to certain banking offices and certain equipment under noncancelable operating lease agreements, however, if adopted at December 31, 2017 based on current leases, management estimates that ASU 2016-02 would have increased the Consolidated Balance Sheets by an estimated $4.7 million from the present value of future lease obligations and would not have a material impact on our regulatory capital ratios. In June 2016, the FASB issued 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 expected credit losses 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 expected credit losses. 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 expect 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 2016, the FASB issued ASU No. 2016‑15, Statement of Cash Flows (Topic 230): Classification of Certain Receipts and Cash Payments. This ASU is intended to address the appropriate classification of eight specific cash flow issues on the cash flow statement. Debt prepayment costs should be classified as an outflow for financing activities. Settlement of zero-coupon debt instruments divides the interest portion as an outflow for operating activities and the principal portion as an outflow for financing activities. Contingent consideration payments made after a business combination should be classified as outflows for financing and operating activities. Proceeds from the settlement of bank-owned life insurance policies should be classified as inflows from investing activities. Other specific areas are identified in the ASU as to the appropriate classification of the cash inflows or outflows. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted and must be applied using retrospective transition method to each period presented. Adoption of ASU 2016-15 is not expected to have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU No. 2017‑08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310‑20): Premium Amortization on Purchased Callable Debt Securities . The ASU shortens the amortization period for certain callable debt securities held at a premium. The standard will take effect for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The adoption of ASU No. 2017‑08 is not expected to have a material impact on the Company’s consolidated financial statements. In May 2017, the FASB issued ASU No. 2017‑09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting . The ASU was issued to provide clarity as to when to apply modification accounting when there is a change in the terms or conditions of a share-based payment award. According to this ASU, an entity should account for the effects of a modification unless the fair value, vesting conditions, and balance sheet classification of the award is the same after the modification as compared to the original award prior to the modification. The standard is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. The adoption of ASU No. 2017‑09 is not expected to have a material impact on the Company’s consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . This ASU amends the hedge accounting recognition and presentation requirements in ASC 815 to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. The amendments in this ASU permit hedge accounting for hedging relationships involving nonfinancial risk and interest rate risk by removing certain limitations in cash flow and fair value hedging relationships. In addition, the ASU requires an entity to present the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported. The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018 and early adoption is permitted. The adoption of ASU No. 2017-12 is not expected to have a material impact on the Company's consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ("AOCI"). ASU 2018-02 eliminates the stranded tax effects within AOCI resulting from the application of current U.S. GAAP in response to the change in the U.S. corporate income tax rate from 35 percent to 21 percent as part of the Tax Act. Stranded tax effects unrelated to the Tax Act are released from AOCI using the security-by-security approach. The effective date of ASU 2018-02 is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted for public entities for which financial statements had not yet been issued. The Company elected to early adopt ASU 2018-02 effective for the year ended December 31, 2017, and applied the provisions retrospectively within our Consolidated Balance Sheets and Statements of Shareholders' Equity. This adoption resulted in a one-time reclassification of the effect of remeasuring deferred tax liabilities related to items, primarily unrealized gains and losses on investments, within AOCI to retained earnings resulting from the change in the U.S. corporate income tax rate. This reclassification resulted in a decrease to AOCI and an increase to retained earnings in the amount of $84,000 for the year ended December 31, 2017, with no net impact to total stockholders' equity.

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combination [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the aggregate amount recognized for each major class of assets acquired and liabilities assumed by 1st Security Bank in the Branch Purchase on January 22, 2016: At January 22, 2016 Purchase price (1) $ 6,015 Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value: Cash and cash equivalents 186,371 Acquired loans 417 Premises and equipment, net 964 Accrued interest receivable 2 Core deposit intangible 2,239 Other assets 103 Deposits (186,364) Accrued interest payable (7) Other liabilities (22) Total fair value of identifiable net assets 3,703 Goodwill $ 2,312 (1) Purchase price includes premium paid on the deposits, the aggregate net book value of all assets acquired, and the unpaid principal and accrued interest on loans acquired. Acquired Book Fair Value Amount January 22, 2016 Value Adjustments Recorded Assets Cash and cash equivalents $ 180,356 $ — $ 180,356 Loans receivable 417 — 417 Premises and equipment, net 697 267 (1) 964 Accrued interest receivable 2 — 2 Core deposit intangible — 2,239 (2) 2,239 Goodwill — 2,312 (3) 2,312 Other assets 103 — 103 Total assets acquired $ 181,575 $ 4,818 $ 186,393 Liabilities Deposits: Noninterest-bearing accounts $ 79,966 $ — $ 79,966 Interest-bearing accounts 106,398 — 106,398 Total deposits 186,364 — 186,364 Accrued interest payable 7 — 7 Other liabilities 22 — 22 Total liabilities assumed $ 186,393 $ — $ 186,393
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Amortization expense for core deposit intangible is expected to be as follows: 2018 307 2019 235 2020 181 2021 166 2022 166 Thereafter 262 Total $ 1,317

Securities Available-for-sale (

Securities Available-for-sale (Tables)	12 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and 2016: December 31, 2017 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 9,077 $ 49 $ (11) $ 9,115 Corporate securities 7,113 9 (96) 7,026 Municipal bonds 12,720 148 (82) 12,786 Mortgage-backed securities 40,161 63 (490) 39,734 U.S. Small Business Administration securities 14,014 — (195) 13,819 Total securities available-for-sale $ 83,085 $ 269 $ (874) $ 82,480 December 31, 2016 Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Values SECURITIES AVAILABLE-FOR-SALE U.S. agency securities $ 8,150 $ 12 $ (94) $ 8,068 Corporate securities 7,654 14 (168) 7,500 Municipal bonds 15,183 164 (83) 15,264 Mortgage-backed securities 45,856 52 (713) 45,195 U.S. Small Business Administration securities 5,862 27 (41) 5,848 Total securities available-for-sale $ 82,705 $ 269 $ (1,099) $ 81,875
Schedule of Unrealized Loss on Investments	Investment securities that were in an unrealized loss position at December 31, 2017 and 2016 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. December 31, 2017 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 $ 2,987 $ (11) $ — $ — $ 2,987 $ (11) Corporate securities 4,102 (15) 1,915 (81) 6,017 (96) Municipal bonds 5,982 (82) — — 5,982 (82) Mortgage-backed securities 7,262 (61) 20,635 (429) 27,897 (490) U.S. Small Business Administration securities 11,876 (162) 1,943 (33) 13,819 (195) Total $ 32,209 $ (331) $ 24,493 $ (543) $ 56,702 $ (874) December 31, 2016 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 $ 6,998 $ (94) $ — $ — $ 6,998 $ (94) Corporate securities 5,048 (106) 1,438 (62) 6,486 (168) Municipal bonds 6,741 (83) — — 6,741 (83) Mortgage-backed securities 39,373 (713) — — 39,373 (713) U.S. Small Business Administration securities 2,963 (41) — — 2,963 (41) Total $ 61,123 $ (1,037) $ 1,438 $ (62) $ 62,561 $ (1,099)
Schedule of Available for Sale Securities by Contractual Maturity	The contractual maturities of securities available-for-sale at December 31, 2017 and 2016 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. December 31, 2017 December 31, 2016 Amortized Fair Amortized Fair Cost Value Cost Value U.S. agency securities Due after one year through five years $ — $ — $ 4,000 $ 3,956 Due after five years through ten years 4,079 4,124 4,150 4,112 Due after ten years 4,998 4,991 — — Subtotal 9,077 9,115 8,150 8,068 Corporate securities Due after one year through five years 5,117 5,111 5,659 5,625 Due after five years through ten years 1,996 1,915 1,995 1,875 Subtotal 7,113 7,026 7,654 7,500 Municipal bonds Due in one year or less — — 509 513 Due after one year through five years 2,001 2,026 5,326 5,386 Due after five years through ten years 4,111 4,206 7,476 7,492 Due after ten years 6,608 6,554 1,872 1,873 Subtotal 12,720 12,786 15,183 15,264 Mortgage-backed securities Federal National Mortgage Association (“FNMA”) 23,310 23,091 23,522 23,197 Federal Home Loan Mortgage Corporation (“FHLMC”) 10,818 10,629 14,950 14,662 Government National Mortgage Association (“GNMA”) 6,033 6,014 7,384 7,336 Subtotal 40,161 39,734 45,856 45,195 U.S. Small Business Administration securities Due after five years through ten years 12,065 11,896 5,862 5,848 Due after ten years 1,949 1,923 — — Subtotal 14,014 13,819 5,862 5,848 Total $ 83,085 $ 82,480 $ 82,705 $ 81,875
Schedule of Realized Gain (Loss)	The proceeds and resulting gains and losses, computed using specific identification from sales of securities available-for-sale for the years ended December 31, 2017 and 2016 were as follows: December 31, 2017 Proceeds Gross Gains Gross Losses Securities available-for-sale $ 39,103 $ 413 $ (33) December 31, 2016 Proceeds Gross Gains Gross Losses Securities available-for-sale $ 13,577 $ 149 $ (3)

Loans Receivable and Allowanc31

Loans Receivable and Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The composition of the loan portfolio was as follows at December 31: 2017 2016 REAL ESTATE LOANS Commercial $ 63,611 $ 55,871 Construction and development 143,068 94,462 Home equity 25,289 20,081 One-to-four-family (excludes loans held for sale) 163,655 124,009 Multi-family 44,451 37,527 Total real estate loans 440,074 331,950 CONSUMER LOANS Indirect home improvement 130,176 107,759 Solar 41,049 36,503 Marine 35,397 28,549 Other consumer 2,046 1,915 Total consumer loans 208,668 174,726 COMMERCIAL BUSINESS LOANS Commercial and industrial 83,306 65,841 Warehouse lending 41,397 32,898 Total commercial business loans 124,703 98,739 Total loans receivable, gross 773,445 605,415 Allowance for loan losses (10,756) (10,211) Deferred costs, fees, premiums, and discounts, net (1,131) (1,887) Total loans receivable, net $ 761,558 $ 593,317
Allowance for Credit Losses on Financing Receivables	The following tables detail activities in the allowance for loan losses by loan categories for the years shown: At or For the Year Ended December 31, 2017 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 Provision for loan losses 1,253 884 (638) (749) 750 Charge-offs (65) (832) (33) — (930) Recoveries 35 680 10 — 725 Net charge-offs (30) (152) (23) — (205) Ending balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 Period end amount allocated to: Loans individually evaluated for impairment $ 21 $ 68 $ — $ — $ 89 Loans collectively evaluated for impairment 4,749 2,746 2,014 1,158 10,667 Ending balance $ 4,770 $ 2,814 $ 2,014 $ 1,158 $ 10,756 LOANS RECEIVABLE Loans individually evaluated for impairment $ 348 $ 195 $ 551 $ — $ 1,094 Loans collectively evaluated for impairment 439,726 208,473 124,152 — 772,351 Ending balance $ 440,074 $ 208,668 $ 124,703 $ — $ 773,445 At or For the Year Ended December 31, 2016 Commercial Real Estate Consumer Business Unallocated Total ALLOWANCE FOR LOAN LOSSES Beginning balance $ 2,874 $ 1,681 $ 1,396 $ 1,834 $ 7,785 Provision for loan losses 622 513 1,192 73 2,400 Charge-offs (65) (1,002) — — (1,067) Recoveries 116 890 87 — 1,093 Net recoveries (charge-offs) 51 (112) 87 — 26 Ending balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 Period end amount allocated to: Loans individually evaluated for impairment $ — $ — $ — $ — $ — Loans collectively evaluated for impairment 3,547 2,082 2,675 1,907 10,211 Ending balance $ 3,547 $ 2,082 $ 2,675 $ 1,907 $ 10,211 LOANS RECEIVABLE Loans individually evaluated for impairment $ 194 $ — $ — $ — $ 194 Loans collectively evaluated for impairment 331,756 174,726 98,739 — 605,221 Ending balance $ 331,950 $ 174,726 $ 98,739 $ — $ 605,415
Past Due Financing Receivables	The following tables provide information pertaining to the aging analysis of contractually past due loans and non-accrual loans for the years ended December 31, 2017 and 2016: December 31, 2017 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 $ — $ — $ — $ — $ 63,611 $ 63,611 $ — Construction and development — — — — 143,068 143,068 — Home equity 122 — 136 258 25,031 25,289 151 One-to-four-family 142 — — 142 163,513 163,655 142 Multi-family — — — — 44,451 44,451 — Total real estate loans 264 — 136 400 439,674 440,074 293 CONSUMER LOANS Indirect home improvement 255 215 99 569 129,607 130,176 195 Solar 49 19 — 68 40,981 41,049 — Marine — — — — 35,397 35,397 — Other consumer — — — — 2,046 2,046 — Total consumer loans 304 234 99 637 208,031 208,668 195 COMMERCIAL BUSINESS LOANS Commercial and industrial — 551 — 551 82,755 83,306 551 Warehouse lending — — — — 41,397 41,397 — Total commercial business loans — 551 — 551 124,152 124,703 551 Total loans $ 568 $ 785 $ 235 $ 1,588 $ 771,857 $ 773,445 $ 1,039 December 31, 2016 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 $ — $ — $ — $ — $ 55,871 $ 55,871 $ — Construction and development — — — — 94,462 94,462 — Home equity 34 — 210 244 19,837 20,081 210 One-to-four-family — — — — 124,009 124,009 — Multi-family — — — — 37,527 37,527 — Total real estate loans 34 — 210 244 331,706 331,950 210 CONSUMER LOANS Indirect home improvement 268 278 167 713 107,046 107,759 435 Solar 92 — 69 161 36,342 36,503 69 Marine 8 — — 8 28,541 28,549 — Other consumer 3 2 4 9 1,906 1,915 7 Total consumer loans 371 280 240 891 173,835 174,726 511 COMMERCIAL BUSINESS LOANS Commercial and industrial — — — — 65,841 65,841 — Warehouse lending — — — — 32,898 32,898 — Total commercial business loans — — — — 98,739 98,739 — Total loans $ 405 $ 280 $ 450 $ 1,135 $ 604,280 $ 605,415 $ 721 There were no loans 90 days or more past due and still accruing interest at December 31, 2017 and 2016.
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 credit losses has been provided and loans for which no allowance was provided for the years ended December 31, 2017 and 2016: December 31, 2017 Unpaid Principal Recorded Related Balance Impairment Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 151 $ — $ 151 $ — One-to-four-family 67 (12) 55 — Total real estate loans 218 (12) 206 — Commercial business loans 551 — 551 — 769 (12) 757 — WITH RELATED ALLOWANCE RECORDED One-to-four-family 142 — 142 21 Consumer loans 195 — 195 68 337 — 337 89 Total $ 1,106 $ (12) $ 1,094 $ 89 December 31, 2016 Unpaid Principal Recorded Related Balance Impairment Investment Allowance WITH NO RELATED ALLOWANCE RECORDED Home equity $ 137 $ — $ 137 $ — One-to-four-family 69 (12) 57 — Total $ 206 $ (12) $ 194 $ — The following table presents the average recorded investment in loans individually evaluated for impairment and the interest income recognized and received for the years ended December 31, 2017 and 2016: At or For the Year Ended December 31, 2017 December 31, 2016 Average Recorded Interest Income Average Recorded Interest Income Investment Recognized Investment Recognized WITH NO RELATED ALLOWANCE RECORDED Home equity $ 219 $ — $ 139 $ 1 One-to-four-family 56 3 57 3 Total real estate loans 275 3 196 4 Commercial business loans 551 24 — — 826 27 196 4 WITH RELATED ALLOWANCE RECORDED One-to-four-family 142 4 — — Consumer loans 281 16 — — 423 20 — — Total $ 1,249 $ 47 $ 196 $ 4
Financing Receivable Credit Quality Indicators	The following tables summarize risk rated loan balances by category at the dates indicated: December 31, 2017 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 62,057 $ — $ 1,554 $ — $ — $ — $ 63,611 Construction and development 143,068 — — — — — 143,068 Home equity 25,138 — — 151 — — 25,289 One-to-four-family 163,513 — — 142 — — 163,655 Multi-family 44,451 — — — — — 44,451 Total real estate loans 438,227 — 1,554 293 — — 440,074 CONSUMER LOANS Indirect home improvement 129,981 — — 195 — — 130,176 Solar 41,049 — — — — — 41,049 Marine 35,397 — — — — — 35,397 Other consumer 1,998 — — 48 — — 2,046 Total consumer loans 208,425 — — 243 — — 208,668 COMMERCIAL BUSINESS LOANS Commercial and industrial 76,942 — 425 5,939 — — 83,306 Warehouse lending 40,724 673 — — — — 41,397 Total commercial business loans 117,666 673 425 5,939 — — 124,703 Total loans $ 764,318 $ 673 $ 1,979 $ 6,475 $ — $ — $ 773,445 December 31, 2016 Special Pass Watch Mention Substandard Doubtful Loss (1 - 5) (6) (7) (8) (9) (10) Total REAL ESTATE LOANS Commercial $ 53,234 $ 2,637 $ — $ — $ — $ — $ 55,871 Construction and development 94,462 — — — — — 94,462 Home equity 19,871 — — 210 — — 20,081 One-to-four-family 124,009 — — — — — 124,009 Multi-family 37,527 — — — — — 37,527 Total real estate loans 329,103 2,637 — 210 — — 331,950 CONSUMER LOANS Indirect home improvement 107,324 — — 435 — — 107,759 Solar 36,434 — — 69 — — 36,503 Marine 28,549 — — — — — 28,549 Other consumer 1,813 — — 102 — — 1,915 Total consumer loans 174,120 — — 606 — — 174,726 COMMERCIAL BUSINESS LOANS Commercial and industrial 58,105 525 — 7,211 — — 65,841 Warehouse lending 32,898 — — — — — 32,898 Total commercial business loans 91,003 525 — 7,211 — — 98,739 Total loans $ 594,226 $ 3,162 $ — $ 8,027 $ — $ — $ 605,415
Schedule of Related Party Loans	Outstanding loan balances were as follows and were within regulatory limitations: At December 31, 2017 2016 Beginning balance $ 313 $ — Additions 351 313 Repayments (9) — Ending balance $ 655 $ 313

Servicing Rights (Tables)

Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value, Off-balance Sheet Risk [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The following table summarizes servicing rights activity for the years ended December 31, 2017 and 2016: 2017 2016 Beginning balance $ 8,459 $ 5,811 Additions 5,075 4,194 Sales (4,751) — Servicing rights amortized (1,988) (1,549) Recovery on servicing rights — 3 Ending balance $ 6,795 $ 8,459
Valuation assumptions used in determining the fair value of servicing rights	The following provides valuation assumptions used in determining the fair value of MSR at the dates indicated: At December 31, 2017 2016 Key assumptions: Weighted average discount rate 9.5 % 9.5 % Conditional prepayment rate (“CPR”) 10.9 % 8.8 % Weighted average life in years 6.7 7.9
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 December 31, 2017 and December 31, 2016 were as follows: December 31, 2017 December 31, 2016 Aggregate portfolio principal balance $ 775,093 $ 973,139 Weighted average rate of note 4.1 % % At December 31, 2017 Base 0.5%Adverse Rate Change 1.0%Adverse Rate Change Conditional prepayment rate 10.9 % 17.7 % 24.5 % Fair value MSR $ 8,602 $ 6,811 $ 5,614 Percentage of MSR 1.1 % 0.9 % 0.7 % Discount rate 9.6 % 10.1 % 10.6 % Fair value MSR $ 8,602 $ 8,433 $ 8,271 Percentage of MSR 1.1 % 1.1 % 1.1 % At December 31, 2016 Base 0.5%Adverse Rate Change 1.0%Adverse Rate Change Conditional prepayment rate 8.8 % 12.8 % 20.2 % Fair value MSR $ 11,735 $ 9,991 $ 7,808 Percentage of MSR 1.2 % 1.0 % 0.8 % Discount rate 9.5 % 10.0 % 10.5 % Fair value MSR $ 11,735 $ 11,480 $ 11,235 Percentage of MSR 1.2 % 1.2 % 1.2 %

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment at December 31, 2017 and 2016 were as follows: 2017 2016 Land $ 2,028 $ 2,028 Buildings 8,611 8,611 Furniture, fixtures, and equipment 10,105 8,826 Leasehold improvements 2,108 2,102 Building improvements 4,545 4,537 Projects in process 189 467 Subtotal 27,586 26,571 Less accumulated depreciation and amortization (12,128) (10,559) Total $ 15,458 $ 16,012
Schedule of Future Minimum Rental Payments for Operating Leases	Minimum net rental commitments under non-cancelable leases, having an original or remaining term of more than one year for future years, were as follows: Years Ending December 31, 2018 $ 1,083 2019 1,019 2020 783 2021 650 2022 541 Thereafter 1,085 Total $ 5,161

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of Other Real Estate Owned	The following table presents the activity related to OREO at and for the years ended December 31: 2017 2016 Beginning balance $ — $ — Net loans transferred to OREO — 525 Capitalized costs — 7 Gross proceeds from sale of OREO — (682) Gain on sale of OREO — 150 Ending balance $ — $ —

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of Deposit Liabilities	Deposits are summarized as follows at December 31: December 31, December 31, 2017 (1) 2016 (1) Noninterest-bearing checking $ 177,739 $ 145,377 Interest-bearing checking 119,872 63,978 Savings 72,082 54,996 Money market (2) 228,742 242,849 Certificates of deposit less than $100,000 (3) 111,489 93,791 Certificates of deposit of $100,000 through $250,000 77,934 74,832 Certificates of deposit of $250,000 and over (4) 32,833 27,094 Escrow accounts related to mortgages serviced 9,151 9,676 Total $ 829,842 $ 712,593 (1) Includes $134.6 million of deposits acquired in the Branch Purchase at December 31, 2017 and $162.2 million at December 31, 2016. (2) Includes $6.5 million of brokered deposits at December 31, 2017 and none at December 31, 2016. (3) Includes $59.3 million and $47.1 million of brokered deposits at December 31, 2017 and 2016, respectively. (4) 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 December 31, 2017 for future years ending are as follows: At December 31, 2017 Maturing in 2018 $ 108,142 Maturing in 2019 56,047 Maturing in 2020 23,781 Maturing in 2021 16,295 Maturing in 2022 17,969 Thereafter 22 Total $ 222,256
Schedule of Interest Expense by Deposit Category	Interest expense by deposit category for the years ended December 31, 2017 and 2016 is as follows: 2017 2016 Interest-bearing checking $ 128 $ 27 Savings and money market 1,260 1,019 Certificates of deposit 2,532 2,208 Total $ 3,920 $ 3,254

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Advances on Borrowing Line	Advances on these lines at December 31, 2017 and 2016 were as follows: 2017 2016 Federal Home Loan Bank - (interest rates ranging from 0.96% to 1.73% and 0.86% to 1.73% at December 31, 2017 and 2016, respectively) $ 7,529 $ 12,670 Total $ 7,529 $ 12,670
Debt with Maximum and Average Balances	The maximum and average outstanding and weighted average interest rates on debt during the years ended December 31, 2017 and 2016 were as follows: 2017 2016 Maximum balance: Federal Home Loan Bank advances and Fed Funds $ 70,419 $ 98,769 Federal Reserve Bank $ 1,000 $ 1,000 Fed Funds lines of credit $ 17,501 $ 6,000 Subordinated note $ 10,000 $ 10,000 Average balance: Federal Home Loan Bank advances and Fed Funds $ 25,635 $ 26,259 Federal Reserve Bank $ 3 $ 3 Fed Funds lines of credit $ 876 $ 16 Subordinated note $ 10,000 $ 10,000 Weighted average interest rate: Federal Home Loan Bank advances and Fed Funds 1.26 % 0.98 % Federal Reserve Bank 1.75 % 1.00 % Fed Funds lines of credit 1.30 % 0.77 % Subordinated note 6.50 % 6.50 %
Schedule of Federal Home Loan Bank Advances Maturities Summary Due	Scheduled maturities of Federal Home Loan Bank advances were as follows: Interest Year Ending December 31, Balances Rates 2018 $ 3,986 1.01 % 2019 1,207 1.73 % 2020 2,336 1.71 % 2021 — — % Total $ 7,529

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of Shares Under ESOP	Shares held by the ESOP at December 31, 2017 and December 31, 2016, were as follows (shown as actual): December 31, 2017 2016 Allocated shares 153,049 126,589 Committed to be released shares — — Unallocated shares 103,684 129,605 Total ESOP shares 256,733 256,194 Fair value of unallocated shares (in thousands) $ 5,696 $ 4,158

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
INCOME TAXES
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense for the years ended December 31, 2017 and 2016, were as follows: 2017 2016 Provision for income taxes Current $ 7,212 $ 5,398 Deferred (718) 206 Total provision for income taxes $ 6,494 $ 5,604
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the effective income tax rate with the federal statutory tax rates at December 31, 2017 and 2016 was as follows: 2017 2016 Amount Rate Amount Rate Income tax provision at statutory rate $ 7,203 35.0 % $ 5,636 35.0 % Tax exempt income (218) (1.0) (255) (1.6) Decrease in tax resulting from other items (487) (2.4) 42 0.3 Income tax rate differential (396) (1.9) — — ESOP 392 1.9 181 1.1 Total $ 6,494 31.6 % $ 5,604 34.8 %
Schedule of Deferred Tax Assets and Liabilities	Total deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows: 2017 2016 Deferred Tax Assets Allowance for loan losses $ 1,912 $ 2,467 Non-accrued loan interest 9 3 Non-qualified stock options — 159 Securities available-for-sale 130 294 Other 210 437 Total deferred tax assets 2,261 3,360 Deferred Tax Liabilities Loan origination costs (870) (1,242) Servicing rights (1,461) (3,003) Prepaids (52) (72) Stock dividend - FHLB stock (1) (1) Property, plant, and equipment (484) (203) Total deferred tax liabilities (2,868) (4,521) Net deferred tax liabilities $ (607) $ (1,161)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments to Extend Credit	The following table provides a summary of the Company’s commitments at December 31, 2017 and 2016: 2017 2016 COMMITMENTS TO EXTEND CREDIT REAL ESTATE LOANS Commercial $ 107 $ 108 Construction and development 73,321 57,016 One-to-four-family (includes locks for salable loans) 37,336 36,623 Home equity 32,889 26,129 Multi-family 438 426 Total real estate loans 144,091 120,302 CONSUMER LOANS 10,041 8,527 COMMERCIAL BUSINESS LOANS Commercial and industrial 52,452 31,774 Warehouse lending 78,303 51,102 Total commercial business loans 130,755 82,876 Total commitments to extend credit $ 284,887 $ 211,705

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and 2016 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 December 31, 2017 Total risk-based capital (to risk-weighted assets) $ 133,967 16.25 % $ 65,965 8.00 % $ 76,272 9.25 % $ 82,456 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 123,651 15.00 % $ 49,474 6.00 % $ 59,781 7.25 % $ 65,965 8.00 % Tier 1 leverage capital (to average assets) $ 123,651 12.61 % $ 39,233 4.00 % N/A N/A $ 49,041 5.00 % CET 1 capital (to risk-weighted assets) $ 123,651 15.00 % $ 37,105 4.50 % $ 47,412 5.75 % $ 53,597 6.50 % At December 31, 2016 Total risk-based capital (to risk-weighted assets) $ 93,309 13.87 % $ 53,813 8.00 % $ 58,051 8.63 % $ 67,266 10.00 % Tier 1 risk-based capital (to risk-weighted assets) $ 84,876 12.62 % $ 40,360 6.00 % $ 44,597 6.63 % $ 53,813 8.00 % Tier 1 leverage capital (to average assets) $ 84,876 10.33 % $ 32,862 4.00 % N/A N/A $ 41,078 5.00 % CET 1 capital (to risk-weighted assets) $ 84,876 12.62 % $ 30,270 4.50 % $ 34,508 5.13 % $ 43,723 6.50 %

Fair Value of Financial Instr41

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
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 December 31, 2017 U.S. agency securities $ — $ 9,115 $ — $ 9,115 Corporate securities — 7,026 — 7,026 Municipal bonds — 12,786 — 12,786 Mortgage-backed securities — 39,734 — 39,734 U.S. Small Business Administration securities — 13,819 — 13,819 Total $ — $ 82,480 $ — $ 82,480 Securities Available-for-Sale Level 1 Level 2 Level 3 Total At December 31, 2016 U.S. agency securities $ — $ 8,068 $ — $ 8,068 Corporate securities — 7,500 — 7,500 Municipal bonds — 15,264 — 15,264 Mortgage-backed securities — 45,195 — 45,195 U.S. Small Business Administration securities — 5,848 — 5,848 Total $ — $ 81,875 $ — $ 81,875
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 December 31, 2017 $ — $ 53,463 $ — $ 53,463 December 31, 2016 $ — $ 52,553 $ — $ 52,553
Schedule of Commitments at Fair Value on Recurring Basis	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 December 31, 2017 $ — $ — $ 726 $ 726 December 31, 2016 $ — $ — $ 818 $ 818 Individual Forward Sale Commitments with Investors Level 1 Level 2 Level 3 Total December 31, 2017 $ — $ (65) $ 51 $ (14) December 31, 2016 $ — $ 495 $ 177 $ 672 Paired Off Commitments with Investors Level 1 Level 2 Level 3 Total December 31, 2017 $ — $ 53 $ — $ 53 December 31, 2016 $ — $ 747 $ — $ 747
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets	The following table presents impaired loans measured at fair value on a nonrecurring basis for which a nonrecurring change in fair value has been recorded during the reporting period. 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 December 31, 2017 $ — $ — $ 1,094 $ 1,094 December 31, 2016 $ — $ — $ 194 $ 194
Schedule of Fair Value of Financial Instruments Measured under a Level 3 Unobservable Input	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 December 31, 2017: Significant Range Weighted Level 3 Fair Value Instrument Valuation Technique Unobservable Inputs (Weighted Average) Average RECURRING Interest rate lock commitments with customers Quoted market prices Pull-through expectations 80% - 99% 94.8 % Individual forward sale commitments with investors Quoted market prices Pull-through expectations 80% - 99% 94.8 % NONRECURRING Impaired loans Fair value of underlying collateral Discount applied to the obtained appraisal 0% - 18.0% — %
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation	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 years ended December 31, 2017 and 2016. 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 year 2017 Interest rate lock commitments with customers $ 818 $ 14,319 $ (14,411) $ 726 $ (92) Individual forward sale commitments with investors 177 141 (267) 51 (126) 2016 Interest rate lock commitments with customers $ 698 $ 16,793 $ (16,673) $ 818 $ 120 Individual forward sale commitments with investors 74 175 (72) 177 103
Fair Value, by Balance Sheet Grouping	The following table provides estimated fair values of the Company’s financial instruments at December 31, 2017 and 2016, whether or not recognized at fair value in the Consolidated Balance Sheets: 2017 2016 Carrying Fair Carrying Fair Amount Value Amount Value Financial Assets Level 1 inputs: Cash and cash equivalents $ 18,915 $ 18,915 $ 36,456 $ 36,456 Certificates of deposit at other financial institutions 18,108 18,108 15,248 15,248 Level 2 inputs: Securities available-for-sale, at fair value 82,480 82,480 81,875 81,875 Loans held for sale, at fair value 53,463 53,463 52,553 52,553 FHLB stock, at cost 2,871 2,871 2,719 2,719 Accrued interest receivable 3,566 3,566 2,524 2,524 Individual forward sale commitments with investors — — 495 495 Paired off commitments with investors 53 53 747 747 Level 3 inputs: Loans receivable, gross 773,445 780,551 605,415 617,630 Servicing rights, held at lower of cost or fair value 6,795 8,608 8,459 11,741 Fair value interest rate locks with customers 726 726 818 818 Individual forward sale commitments with investors 51 51 177 177 Financial Liabilities Level 2 inputs: Deposits 829,842 838,087 712,593 718,970 Borrowings 7,529 7,498 12,670 12,660 Subordinated note 9,845 10,741 9,825 9,805 Accrued interest payable 214 214 192 192 Paired off commitments with investors 65 65 — —

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
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 years ended December 31, 2017 and 2016. At or For the Year Ended December 31, Numerator: 2017 2016 Net income (in thousands) $ 14,085 $ 10,499 Denominator: Basic weighted average common shares outstanding 3,094,586 2,896,209 Dilutive shares 197,114 93,950 Diluted weighted average common shares outstanding 3,291,700 2,990,159 Basic earnings per share $ 4.55 $ 3.63 Diluted earnings per share $ 4.28 $ 3.51

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following tables summarize the Company’s derivative instruments at the dates indicated: December 31, 2017 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 31,951 $ 726 $ — Mandatory and best effort forward commitments with investors 12,505 51 — Forward TBA mortgage-backed securities 66,500 — 65 TBA mortgage-backed securities forward sales paired off with investors 36,500 53 — December 31, 2016 Fair Value Notional Asset Liability Fallout adjusted interest rate lock commitments with customers $ 33,289 $ 818 $ — Mandatory and best effort forward commitments with investors 23,536 177 — Forward TBA mortgage-backed securities 53,000 495 — TBA mortgage-backed securities forward sales paired off with investors 44,000 747 —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
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 plan awards during the year ended December 31, 2017 (shown as actual): Weighted-Average Weighted- Remaining Average Contractual Term In Aggregate Shares Exercise Price Years Intrinsic Value Outstanding at January 1, 2017 295,850 $ 16.89 7.36 $ 5,638,901 Granted — — — — Less exercised 39,613 $ 16.89 — $ 1,113,997 Forfeited or expired — — — — Outstanding at December 31, 2017 256,237 $ 16.89 6.36 $ 9,655,010 Expected to vest, assuming a 0.31% annual forfeiture rate (1) 255,902 $ 16.89 6.36 $ 9,642,373 Exercisable at December 31, 2017 129,437 $ 16.89 6.36 $ 4,877,186 (1) Forfeiture rate has been calculated and estimated to assume a forfeiture of 1/32 over the 10-year contractual life, or 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 year ended December 31, 2017 (shown as actual): Weighted-Average Grant-Date Fair Value Nonvested Shares Shares Per Share Nonvested at January 1, 2017 68,763 $ 17.49 Granted — — Less vested 31,921 $ 17.32 Forfeited or expired — — Nonvested at December 31, 2017 36,842 $ 17.63

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2017
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 years ended December 31, 2017 and 2016: At or For the Year Ended December 31, 2017 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 2,587 $ 38,661 $ 41,248 Provision for loan losses (287) (463) (750) Noninterest income 18,973 5,101 24,074 Noninterest expense (17,052) (26,941) (43,993) Income before provision for income taxes 4,221 16,358 20,579 Provision for income taxes (1,332) (5,162) (6,494) Net income $ 2,889 $ 11,196 $ 14,085 Total assets $ 220,353 $ 761,430 $ 981,783 Total average assets at year end $ 203,379 $ 720,202 $ 923,581 FTEs 119 207 326 At or For the Year Ended December 31, 2016 Home Lending Commercial and Consumer Banking Total Condensed income statement: Net interest income (1) $ 2,221 $ 31,636 $ 33,857 Provision for loan losses (208) (2,192) (2,400) Noninterest income 19,195 4,374 23,569 Noninterest expense (14,944) (23,979) (38,923) Income before provision for income taxes 6,264 9,839 16,103 Provision for income taxes (2,180) (3,424) (5,604) Net income $ 4,084 $ 6,415 $ 10,499 Total assets $ 184,003 $ 643,923 $ 827,926 Total average assets at year end $ 153,812 $ 645,208 $ 799,020 FTEs 112 194 306 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.

Basis of Presentation and Sum46

Basis of Presentation and Summary of Significant Accounting Policies (Details)	1 Months Ended	12 Months Ended
	Apr. 30, 2018item	Dec. 31, 2018	Dec. 31, 2017USD ($)segmentitem	Dec. 31, 2016USD ($)	Jan. 22, 2016item	Jul. 09, 2012
Schedule of Accounting Policies [Line Items]
Percentage of common shares purchased under ESOP						8.00%
Number of business segments | segment			2
Cash and due from banks and interest-bearing deposits in excess of FDIC insured limits			$ 15,000	$ 7,800,000
FHLB investment requirement, capital stock amount			$ 994,000
FHLB investment requirement, percent of advances from FHLB			4.00%
Impairment of FHLB stock			$ 0	0
Maximum term interest is accrued on delinquent loan			90 days
Maximum term delinquent loan is returned to accrual status			90 days
Minimum term delinquent loan performs under contract terms and returned to accrual status			6 months
Goodwill impairment			$ 0	$ 0
Income tax provision at statutory rate			35.00%	35.00%
Cash on hand and deposit balances with FRB			$ 18,200,000	$ 10,700,000
Marketing and advertising expense			$ 716,000	$ 710,000
Minimum
Schedule of Accounting Policies [Line Items]
Operating lease, renewal term			5 years
Maximum
Schedule of Accounting Policies [Line Items]
Operating lease, renewal term			10 years
Forecast
Schedule of Accounting Policies [Line Items]
Income tax provision at statutory rate		21.00%
Proforma adjustment | ASU 2016-02
Schedule of Accounting Policies [Line Items]
Present value of future lease obligation			$ 4,700,000
Building and building improvements | Minimum
Schedule of Accounting Policies [Line Items]
Useful life			25 years
Building and building improvements | Maximum
Schedule of Accounting Policies [Line Items]
Useful life			40 years
Furniture, fixtures and equipment | Minimum
Schedule of Accounting Policies [Line Items]
Useful life			3 years
Furniture, fixtures and equipment | Maximum
Schedule of Accounting Policies [Line Items]
Useful life			10 years
Puget Sound [Member]
Schedule of Accounting Policies [Line Items]
Number of bank branches | item			11
Number of Loan Production Facilities | item			7
Tri-Cities, Washington [Member]
Schedule of Accounting Policies [Line Items]
Number of Loan Production Facilities | item			1
Subsequent Event
Schedule of Accounting Policies [Line Items]
Lease term	5 years
Number of lease renewal options | item	2
Operating lease, renewal term	5 years
Bank of America
Schedule of Accounting Policies [Line Items]
Number of bank branches | item					4
Retained Earnings
Schedule of Accounting Policies [Line Items]
AOCI to Retained Earnings, Tax Effect			$ 84,000
Accumulated Other Comprehensive Income
Schedule of Accounting Policies [Line Items]
AOCI to Retained Earnings, Tax Effect			$ (84,000)

Business Combination - Narrativ

Business Combination - Narrative (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 22, 2016USD ($)item
Business Acquisition [Line Items]
Deposits			$ 134,600,000	$ 162,200,000
Loans and associated interest receivables					$ 419,000
Facilities and other assets, net of other liabilities					$ 778,000
Deposit premium (as a percent)					2.50%
Increase in amortization of core deposit intangible		$ 6,000
Bank of America
Business Acquisition [Line Items]
Number of bank branches | item					4
Number of owned bank branches acquired | item					2
Deposits					$ 186,364,000
Number of leases acquired with the bank branches | item					3
Deposit premium					$ 4,800,000
Cash and cash equivalents					186,371,000
Core deposit intangible increase in fair value	$ 100,000
Core deposit intangible, net	2,100,000	$ 2,100,000			2,239,000
Decrease in fair value adjustment of goodwill	$ 100,000
Bank of America | Acquired Book Value
Business Acquisition [Line Items]
Deposits					186,364,000
Cash and cash equivalents					180,356,000
Bank of America | Fair Value Adjustments
Business Acquisition [Line Items]
Core deposit intangible, net					2,239,000
Bank of America | Carrying Amount
Business Acquisition [Line Items]
Deposits					186,364,000
Cash and cash equivalents					180,356,000
Core deposit intangible, net					$ 2,239,000

Business Combination - Estimate

Business Combination - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 22, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Goodwill		$ 2,312	$ 2,312
Noninterest-bearing accounts		186,890	155,053
Interest-bearing accounts		642,952	557,540
Total deposits		$ 134,600	$ 162,200
Estimated amortization period	9 years
Bank of America
Business Acquisition [Line Items]
Cash and cash equivalents	$ 186,371
Premises and equipment, net	964
Accrued interest receivable	2
Core deposit intangible	2,239			$ 2,100
Goodwill	2,312
Other assets	103
Total deposits	186,364
Accrued interest payable	7
Other liabilities	$ 22
Estimated amortization period	9 years
Acquired Book Value | Bank of America
Business Acquisition [Line Items]
Cash and cash equivalents	$ 180,356
Loans receivable	417
Premises and equipment, net	697
Accrued interest receivable	2
Other assets	103
Total assets acquired	181,575
Noninterest-bearing accounts	79,966
Interest-bearing accounts	106,398
Total deposits	186,364
Accrued interest payable	7
Other liabilities	22
Total liabilities assumed	186,393
Fair Value Adjustments | Bank of America
Business Acquisition [Line Items]
Premises and equipment, net	267
Core deposit intangible	2,239
Goodwill	2,312
Total assets acquired	4,818
Carrying Amount | Bank of America
Business Acquisition [Line Items]
Cash and cash equivalents	180,356
Loans receivable	417
Premises and equipment, net	964
Accrued interest receivable	2
Core deposit intangible	2,239
Goodwill	2,312
Other assets	103
Total assets acquired	186,393
Noninterest-bearing accounts	79,966
Interest-bearing accounts	106,398
Total deposits	186,364
Accrued interest payable	7
Other liabilities	22
Total liabilities assumed	$ 186,393

Business Combination - Amount R

Business Combination - Amount Recognized for Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Jan. 22, 2016
Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
Deposits	$ (134,600)	$ (162,200)
Goodwill	$ 2,312	$ 2,312
Bank of America
Business Acquisition [Line Items]
Purchase price				$ 6,015
Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
Cash and cash equivalents				186,371
Acquired loans				417
Premises and equipment, net				964
Accrued interest receivable				2
Core deposit intangible, net			$ 2,100	2,239
Other assets				103
Deposits				(186,364)
Accrued interest payable				(7)
Other liabilities				(22)
Total fair value of identifiable net assets				3,703
Goodwill				$ 2,312

Business Combination - Expected

Business Combination - Expected Amortization Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Amortization of core deposit intangible	$ 400,000	$ 522,000
2,018	307,000
2,019	235,000
2,020	181,000
2,021	166,000
2,022	166,000
Thereafter	262,000
Total	$ 1,317,000	$ 1,717,000

Securities Available-for-sale -

Securities Available-for-sale - Available-for-sale securities reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 83,085	$ 82,705
Unrealized Gains	269	269
Unrealized Losses	(874)	(1,099)
Estimated Fair Values	82,480	81,875
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,077	8,150
Unrealized Gains	49	12
Unrealized Losses	(11)	(94)
Estimated Fair Values	9,115	8,068
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,113	7,654
Unrealized Gains	9	14
Unrealized Losses	(96)	(168)
Estimated Fair Values	7,026	7,500
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,720	15,183
Unrealized Gains	148	164
Unrealized Losses	(82)	(83)
Estimated Fair Values	12,786	15,264
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,161	45,856
Unrealized Gains	63	52
Unrealized Losses	(490)	(713)
Estimated Fair Values	39,734	45,195
U.S. Small Business Administration securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,014	5,862
Unrealized Gains		27
Unrealized Losses	(195)	(41)
Estimated Fair Values	$ 13,819	$ 5,848

Securities Available-for-sale52

Securities Available-for-sale - Narrative (Details)	12 Months Ended
	Dec. 31, 2017USD ($)securityitem	Dec. 31, 2016USD ($)item
Schedule of Available-for-sale Securities [Line Items]
Number of investments with unrealized losses of less than one year | item	21	48
Number of investments with unrealized losses of more than one year | item	17	2
Other than temporary impairment write-downs	$ 0	$ 0
Gross Gains	413	149
Gross Losses	(33)	(3)
Proceeds	$ 39,103	$ 13,577
1st Security Bank of Washington
Schedule of Available-for-sale Securities [Line Items]
Number of securities pledged and held at FHLB | security	9
Pledged securities for FHLB	$ 10,700,000
Public deposits	7,600,000
Collateral requirement	$ 3,200,000

Securities Available-for-sale53

Securities Available-for-sale - Investments with Unrealized Losses Policy (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	$ 32,209	$ 61,123
Unrealized loss position, 12 Months or Longer, Fair Value	24,493	1,438
Unrealized loss position, Fair Value	56,702	62,561
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(331)	(1,037)
Unrealized loss position, 12 Months or Longer, Unrealized Losses	(543)	(62)
Unrealized loss position, Unrealized Losses	(874)	(1,099)
U.S. agency securities
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	2,987	6,998
Unrealized loss position, Fair Value	2,987	6,998
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(11)	(94)
Unrealized loss position, Unrealized Losses	(11)	(94)
Corporate securities
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	4,102	5,048
Unrealized loss position, 12 Months or Longer, Fair Value	1,915	1,438
Unrealized loss position, Fair Value	6,017	6,486
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(15)	(106)
Unrealized loss position, 12 Months or Longer, Unrealized Losses	(81)	(62)
Unrealized loss position, Unrealized Losses	(96)	(168)
Municipal bonds
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	5,982	6,741
Unrealized loss position, Fair Value	5,982	6,741
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(82)	(83)
Unrealized loss position, Unrealized Losses	(82)	(83)
Mortgage-backed securities
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	7,262	39,373
Unrealized loss position, 12 Months or Longer, Fair Value	20,635
Unrealized loss position, Fair Value	27,897	39,373
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(61)	(713)
Unrealized loss position, 12 Months or Longer, Unrealized Losses	(429)
Unrealized loss position, Unrealized Losses	(490)	(713)
U.S. Small Business Administration securities
Fair Value
Unrealized loss position, Less than 12 Months, Fair Value	11,876	2,963
Unrealized loss position, 12 Months or Longer, Fair Value	1,943
Unrealized loss position, Fair Value	13,819	2,963
Unrealized Losses
Unrealized loss position, Less than 12 Months, Unrealized Losses	(162)	(41)
Unrealized loss position, 12 Months or Longer, Unrealized Losses	(33)
Unrealized loss position, Unrealized Losses	$ (195)	$ (41)

Securities Available-for-sale54

Securities Available-for-sale - Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost
Mortgage-backed securities	$ 40,161	$ 45,856
Total	83,085	82,705
Fair Value
Mortgage-backed securities	39,734	45,195
Total	82,480	81,875
Federal National Mortgage Association (FNMA)
Amortized Cost
Mortgage-backed securities	23,310	23,522
Fair Value
Mortgage-backed securities	23,091	23,197
Federal Home Loan Mortgage Corporation (FHLMC)
Amortized Cost
Mortgage-backed securities	10,818	14,950
Fair Value
Mortgage-backed securities	10,629	14,662
Government National Mortgage Association (GNMA)
Amortized Cost
Mortgage-backed securities	6,033	7,384
Fair Value
Mortgage-backed securities	6,014	7,336
U.S. agency securities
Amortized Cost
Due after one year through five years		4,000
Due after five years through ten years	4,079	4,150
Due after ten years	4,998
Subtotal	9,077	8,150
Fair Value
Due after one year through five years		3,956
Due after five years through ten years	4,124	4,112
Due after ten years	4,991
Subtotal	9,115	8,068
Corporate securities
Amortized Cost
Due after one year through five years	5,117	5,659
Due after five years through ten years	1,996	1,995
Subtotal	7,113	7,654
Fair Value
Due after one year through five years	5,111	5,625
Due after five years through ten years	1,915	1,875
Subtotal	7,026	7,500
Municipal bonds
Amortized Cost
Due in one year or less		509
Due after one year through five years	2,001	5,326
Due after five years through ten years	4,111	7,476
Due after ten years	6,608	1,872
Subtotal	12,720	15,183
Fair Value
Due in one year or less		513
Due after one year through five years	2,026	5,386
Due after five years through ten years	4,206	7,492
Due after ten years	6,554	1,873
Subtotal	12,786	15,264
U.S. Small Business Administration securities
Amortized Cost
Due after five years through ten years	12,065	5,862
Due after ten years	1,949
Subtotal	14,014	5,862
Fair Value
Due after five years through ten years	11,896	5,848
Due after ten years	1,923
Subtotal	$ 13,819	$ 5,848

Securities Available-for-sale55

Securities Available-for-sale - Sales of Available for Sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 39,103	$ 13,577
Gross Gains	413	149
Gross Losses	$ (33)	$ (3)

Loans Receivable and Allowanc56

Loans Receivable and Allowance For Loan Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 773,445	$ 605,415
Allowance for loan losses	(10,756)	(10,211)
Deferred costs, fees, and discounts, net	(1,131)	(1,887)
Loans receivable, net	761,558	593,317
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	440,074	331,950
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	63,611	55,871
Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	143,068	94,462
Home equity loan
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,289	20,081
One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment [Line Items]
Total loans	163,655	124,009
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,451	37,527
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	208,668	174,726
Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	130,176	107,759
Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,049	36,503
Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,397	28,549
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,046	1,915
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,703	98,739
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	83,306	65,841
Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 41,397	$ 32,898

Loans Receivable and Allowanc57

Loans Receivable and Allowance For Loan Losses - Narrative (Details)	12 Months Ended
	Dec. 31, 2017item
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments	3
Multi-family | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of units in real estate property	5

Loans Receivable and Allowanc58

Loans Receivable and Allowance For Loan Losses - Allowance for Loan Losses by Loan Categories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
ALLOWANCE FOR LOAN LOSSES
Beginning balance	$ 10,211	$ 7,785
Provision for loan loss	750	2,400
Charge-offs	(930)	(1,067)
Recoveries	725	1,093
Net recoveries (charge-offs)	(205)	26
Loans individually evaluated for impairment	89
Loans collectively evaluated for impairment	10,667	10,211
Ending balance	10,756	10,211
LOANS RECEIVABLE
Loans individually evaluated for impairment	1,094	194
Loans collectively evaluated for impairment	772,351	605,221
Total loans receivable	773,445	605,415
Real Estate
ALLOWANCE FOR LOAN LOSSES
Beginning balance	3,547	2,874
Provision for loan loss	1,253	622
Charge-offs	(65)	(65)
Recoveries	35	116
Net recoveries (charge-offs)	(30)	51
Loans individually evaluated for impairment	21
Loans collectively evaluated for impairment	4,749	3,547
Ending balance	4,770	3,547
LOANS RECEIVABLE
Loans individually evaluated for impairment	348	194
Loans collectively evaluated for impairment	439,726	331,756
Total loans receivable	440,074	331,950
Consumer loans
ALLOWANCE FOR LOAN LOSSES
Beginning balance	2,082	1,681
Provision for loan loss	884	513
Charge-offs	(832)	(1,002)
Recoveries	680	890
Net recoveries (charge-offs)	(152)	(112)
Loans individually evaluated for impairment	68
Loans collectively evaluated for impairment	2,746	2,082
Ending balance	2,814	2,082
LOANS RECEIVABLE
Loans individually evaluated for impairment	195
Loans collectively evaluated for impairment	208,473	174,726
Total loans receivable	208,668	174,726
Commercial business loans
ALLOWANCE FOR LOAN LOSSES
Beginning balance	2,675	1,396
Provision for loan loss	(638)	1,192
Charge-offs	(33)
Recoveries	10	87
Net recoveries (charge-offs)	(23)	87
Loans collectively evaluated for impairment	2,014	2,675
Ending balance	2,014	2,675
LOANS RECEIVABLE
Loans individually evaluated for impairment	551
Loans collectively evaluated for impairment	124,152	98,739
Total loans receivable	124,703	98,739
Unallocated Financing Receivables [Member]
ALLOWANCE FOR LOAN LOSSES
Beginning balance	1,907	1,834
Provision for loan loss	(749)	73
Loans collectively evaluated for impairment	1,158	1,907
Ending balance	$ 1,158	$ 1,907

Loans Receivable and Allowanc59

Loans Receivable and Allowance For Loan Losses - Aging Analysis of Past Due Loans) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,588,000	$ 1,135,000
Current	771,857,000	604,280,000
Total loans receivable	773,445,000	605,415,000
Non-Accrual	1,039,000	721,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	63,611,000	55,871,000
Total loans receivable	63,611,000	55,871,000
Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	143,068,000	94,462,000
Total loans receivable	143,068,000	94,462,000
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	258,000	244,000
Current	25,031,000	19,837,000
Total loans receivable	25,289,000	20,081,000
Non-Accrual	151,000	210,000
One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142,000
Current	163,513,000	124,009,000
Total loans receivable	163,655,000	124,009,000
Non-Accrual	142,000
Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	44,451,000	37,527,000
Total loans receivable	44,451,000	37,527,000
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	400,000	244,000
Current	439,674,000	331,706,000
Total loans receivable	440,074,000	331,950,000
Non-Accrual	293,000	210,000
Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	569,000	713,000
Current	129,607,000	107,046,000
Total loans receivable	130,176,000	107,759,000
Non-Accrual	195,000	435,000
Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	68,000	161,000
Current	40,981,000	36,342,000
Total loans receivable	41,049,000	36,503,000
Non-Accrual		69,000
Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8,000
Current	35,397,000	28,541,000
Total loans receivable	35,397,000	28,549,000
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,046,000
Total loans receivable	2,046,000	1,915,000
Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans receivable	35,397,000	28,549,000
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	637,000	891,000
Current	208,031,000	173,835,000
Total loans receivable	208,668,000	174,726,000
Non-Accrual	195,000	511,000
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	551,000
Current	82,755,000	65,841,000
Total loans receivable	83,306,000	65,841,000
Non-Accrual	551,000
Warehouse lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	41,397,000	32,898,000
Total loans receivable	41,397,000	32,898,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	568,000	405,000
30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	122,000	34,000
30-59 Days Past Due | One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142,000
30-59 Days Past Due | Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	264,000	34,000
30-59 Days Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	255,000	268,000
30-59 Days Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	49,000	92,000
30-59 Days Past Due | Marine
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8,000
30-59 Days Past Due | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	304,000	371,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	785,000	280,000
60-89 Days Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	215,000	278,000
60-89 Days Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,000
60-89 Days Past Due | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	234,000	280,000
60-89 Days Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	551,000
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	235,000	450,000
90 Days or More Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	136,000	210,000
90 Days or More Past Due | Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	136,000	210,000
90 Days or More Past Due | Indirect home improvement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99,000	167,000
90 Days or More Past Due | Solar
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		69,000
90 Days or More Past Due | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99,000	240,000
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		9,000
Current		1,906,000
Total loans receivable		1,915,000
Non-Accrual		7,000
Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,000
Other consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,000
Other consumer | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		4,000
COMMERCIAL BUSINESS LOANS.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	551,000
Current	124,152,000	98,739,000
Total loans receivable	124,703,000	$ 98,739,000
Non-Accrual	551,000
COMMERCIAL BUSINESS LOANS. | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 551,000

Loans Receivable and Allowanc60

Loans Receivable and Allowance For Loan Losses - Financing Receivables, Related Allowance Recorded and No Related Allowance Recorder (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	$ 769
Unpaid Principal Balance, with related allowance recorded	337
Impaired Financing Receivable, Unpaid Principal Balance, Total	1,106
Impaired Financing Receivable, Write-downs [Abstract]
Impairment	(12)
Write-downs	(12)
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	757
Recorded Investment, with related allowance recorded	337
Recorded Investment	1,094
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with related allowance recorded	89
Related Allowance	89
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	826	$ 196
Average Recorded Investment, with related allowance recorded	423
Impaired Financing Receivable, Average Recorded Investment	1,249	196
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with no related allowance recorded	27	4
Interest Income Recognized, with related allowance recorded	20
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	47	4
One-to-four-family (includes locks for salable loans)
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with related allowance recorded	142
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with related allowance recorded	142
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with related allowance recorded	21
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with related allowance recorded	142
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with related allowance recorded	4
Consumer loans
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with related allowance recorded	195
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with related allowance recorded	195
Impaired Financing Receivable Related Allowance Abstract
Related Allowance, with related allowance recorded	68
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with related allowance recorded	281
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with related allowance recorded	16
Commercial business loans
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	551
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	551
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	551
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with no related allowance recorded	24
Total real estate loans
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	218	206
Impaired Financing Receivable, Write-downs [Abstract]
Impairment	(12)	(12)
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	206	194
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	275	196
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with no related allowance recorded	3	4
Total real estate loans | Home equity
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	151	137
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	151	137
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	219	139
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with no related allowance recorded		1
Total real estate loans | One-to-four-family (includes locks for salable loans)
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, with no related allowance recorded	67	69
Impaired Financing Receivable, Write-downs [Abstract]
Impairment	(12)	(12)
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, with no related allowance recorded	55	57
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, with no related allowance recorded	56	57
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Interest Income Recognized, with no related allowance recorded	$ 3	$ 3

Loans Receivable and Allowanc61

Loans Receivable and Allowance For Loan Losses - Loans by Credit Quality Indicator (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 773,445,000	$ 605,415,000
Mortgage Loans in Process of Foreclosure, Amount		43,000
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	440,074,000	331,950,000
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	63,611,000	55,871,000
Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	143,068,000	94,462,000
Home equity loan
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,289,000	20,081,000
One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment [Line Items]
Total loans	163,655,000	124,009,000
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,451,000	37,527,000
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	208,668,000	174,726,000
Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	130,176,000	107,759,000
Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,049,000	36,503,000
Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,397,000	28,549,000
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,046,000	1,915,000
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,703,000	98,739,000
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	83,306,000	65,841,000
Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,397,000	32,898,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	764,318,000	594,226,000
Pass | Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	438,227,000	329,103,000
Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	62,057,000	53,234,000
Pass | Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	143,068,000	94,462,000
Pass | Home equity loan
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,138,000	19,871,000
Pass | One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment [Line Items]
Total loans	163,513,000	124,009,000
Pass | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,451,000	37,527,000
Pass | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	208,425,000	174,120,000
Pass | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	129,981,000	107,324,000
Pass | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,049,000	36,434,000
Pass | Marine
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,397,000	28,549,000
Pass | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,998,000	1,813,000
Pass | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	117,666,000	91,003,000
Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	76,942,000	58,105,000
Pass | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,724,000	32,898,000
Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	673,000	3,162,000
Watch | Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,637,000
Watch | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,637,000
Watch | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	673,000	525,000
Watch | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans		525,000
Watch | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Total loans	673,000
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,979,000
Special Mention | Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,554,000
Special Mention | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,554,000
Special Mention | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	425,000
Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	425,000
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,475,000	8,027,000
Substandard | Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	293,000	210,000
Substandard | Home equity loan
Financing Receivable, Recorded Investment [Line Items]
Total loans	151,000	210,000
Substandard | One-to-four-family (includes locks for salable loans)
Financing Receivable, Recorded Investment [Line Items]
Total loans	142,000
Substandard | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	243,000	606,000
Substandard | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
Total loans	195,000	435,000
Substandard | Solar
Financing Receivable, Recorded Investment [Line Items]
Total loans		69,000
Substandard | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	48,000	102,000
Substandard | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,939,000	7,211,000
Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 5,939,000	$ 7,211,000

Loans Receivable and Allowanc62

Loans Receivable and Allowance For Loan Losses - Related Party Loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 313,000
Additions	351,000	$ 313,000
Repayments	(9,000)
Ending balance	655,000	313,000
Aggregate loan balances of extended credit	$ 819,000	$ 469,000

Servicing Rights - Narrative (D

Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractually specified servicing fees, late fees, and other ancillary fees	$ 2,200	$ 2,000
Gain on sale of mortgage servicing rights ("MSR")	1,062
Mortgage servicing rights
Off-balance Sheet Risks, Disclosure Information [Line Items]
The unpaid principal balances of mortgage loans serviced	778,900	977,100
Fair market value of servicing rights' assets	$ 8,600	$ 11,700

Servicing Rights - Servicing Ri

Servicing Rights - Servicing Rights (Details) - Carrying Amount - Mortgage servicing rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 8,459	$ 5,811
Additions	5,075	4,194
Sales	(4,751)
Servicing rights amortized	(1,988)	(1,549)
Impairment on servicing rights		3
Ending balance	$ 6,795	$ 8,459

Servicing Rights - Valuation As

Servicing Rights - Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Off-balance Sheet Risks, Disclosure Information [Line Items]
Weighted average discount rate	9.50%	9.50%
Conditional prepayment rate ("CPR")	10.90%	8.80%
Weighted average life in years	6 years 8 months 12 days	7 years 10 months 24 days
Mortgage, commercial and consumer servicing rIghts
Off-balance Sheet Risks, Disclosure Information [Line Items]
Weighted average discount rate	9.60%	9.50%
Conditional prepayment rate ("CPR")	10.90%	8.80%

Servicing Rights - Changes in V

Servicing Rights - Changes in Valuation Assumptions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Off-balance Sheet Risks, Disclosure Information [Line Items]
Conditional prepayment rate	10.90%	8.80%
Discount rate	9.50%	9.50%
Mortgage, commercial and consumer servicing rIghts
Off-balance Sheet Risks, Disclosure Information [Line Items]
Aggregate portfolio principal balance	$ 775,093	$ 973,139
Weighted average rate of note	4.10%	3.90%
Conditional prepayment rate	10.90%	8.80%
Conditional prepayment rate, 0.5% Adverse Change	17.70%	12.80%
Conditional prepayment rate, 1.0% Adverse Change	24.50%	20.20%
Fair value MSR	$ 8,602	$ 11,735
Fair value MSR, 0.5% Adverse Change	6,811	9,991
Fair value of MSR, 1.0% Adverse Change	$ 5,614	$ 7,808
Percentage of MSR	1.10%	1.20%
Percentage of MSR, 0.5% Adverse Change	0.90%	1.00%
Percentage of MSR, 1.0% Adverse Change	0.70%	0.80%
Discount rate	9.60%	9.50%
Discount rate, 0.5% Adverse Change	10.10%	10.00%
Discount rate, 1.0% Adverse Change	10.60%	10.50%
Fair value MSR, 0.5% Adverse Change	$ 8,433	$ 11,480
Fair value MSR, 1.0% Adverse Change	$ 8,271	$ 11,235
Percentage of MSR, 0.5% Adverse Change	1.10%	1.20%
Percentage of MSR, 1.0% Adverse Change	1.10%	1.20%

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 27,586	$ 26,571
Less accumulated depreciation and amortization	(12,128)	(10,559)
Property, Plant and Equipment, Net, Total	15,458	16,012
Depreciation and amortization	1,600	1,400
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,028	2,028
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	8,611	8,611
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	10,105	8,826
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,108	2,102
Building improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,545	4,537
Projects in process
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 189	$ 467

Premises and Equipment - Operat

Premises and Equipment - Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,018	$ 1,083
2,019	1,019
2,020	783
2,021	650
2,022	541
Thereafter	1,085
Total	5,161
Rental expense of leased premises	$ 1,100	$ 977,000
Minimum
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease, renewal term	5 years
Maximum
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease, renewal term	10 years

Other Real Estate Owned - Activ

Other Real Estate Owned - Activity related to OREO (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Other Real Estate [Roll Forward]
Net loans transferred to OREO	$ 525
Capitalized costs	7
Gross proceeds from sale of OREO	(682)
Gains losses on sales of investment real estate	$ 150

Other Real Estate Owned - Narra

Other Real Estate Owned - Narrative (Details)	12 Months Ended
	Dec. 31, 2017USD ($)property	Dec. 31, 2016USD ($)property
Banking and Thrift [Abstract]
Number of other real estate owned properties | property	0	0
Other real estate owned holding costs (recovery) | $	$ 0	$ 0

Deposits - Deposit Liabilities

Deposits - Deposit Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Noninterest-bearing checking	$ 177,739	$ 145,377
Interest-bearing checking	119,872	63,978
Savings	72,082	54,996
Money market (4)	228,742	242,849
Certificates of deposit less than $100,000	111,489	93,791
Certificates of deposit of $100,000 through $250,000	77,934	74,832
Certificates of deposit of $250,000 and over	32,833	27,094
Escrow accounts related to mortgages serviced	9,151	9,676
Total deposits	829,842	712,593
Remaining Branch Purchase Deposits	134,600	162,200
Certificate of Deposit, Brokered	6,500	0
Interest-bearing Domestic Deposit, Brokered	$ 59,300	$ 47,100

Deposits - Maturities of Time D

Deposits - Maturities of Time Deposits for Future Periods (Details) $ in Thousands	Dec. 31, 2017USD ($)
Banking and Thrift [Abstract]
Maturing in 2018	$ 108,142
Maturing in 2019	56,047
Maturing in 2020	23,781
Maturing in 2021	16,295
Maturing in 2022	17,969
Thereafter	22
Total	$ 222,256

Deposits - Interest Expense by

Deposits - Interest Expense by Deposit Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Interest-bearing checking	$ 128	$ 27
Savings and money market	1,260	1,019
Certificates of deposit	2,532	2,208
Total	$ 3,920	$ 3,254

Deposits - Related Party Policy

Deposits - Related Party Policy (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Related-party deposits	$ 2,100	$ 976,000

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2016	Oct. 15, 2015
Debt Instrument [Line Items]
Federal home loan bank, advances, general debt obligations, maximum amount available, percentage of total assets (as a percent)	35.00%
Federal home loan bank, advances, general debt obligations, collateral pledged	$ 318,500,000
Federal home loan bank, advances, general debt obligations, unused capacity on pledged loans	201,000,000
Unsecured Fed Funds lines of credit	43,000,000
Unsecured Fed Funds, lines of credit, outstanding balance	0
Principal amount of subordinated debt				$ 10,000,000
Subordinated note				$ 10,000,000
Subordinated Note
Debt Instrument [Line Items]
Annual interest rate (as a percent)				6.50%
Contributions of proceeds from subordinated debt		$ 9,000,000
Federal Reserve Bank
Debt Instrument [Line Items]
Warehouse lines of credit	99,100,000		$ 85,900,000
Line of credit, outstanding balance	0
Federal Reserve Bank
Debt Instrument [Line Items]
Loans pledged as collateral	$ 203,300,000

Debt - Advances on Borrowing Li

Debt - Advances on Borrowing Line (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, advances, general debt obligations	$ 7,529	$ 12,670
Securities Line
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, advances, general debt obligations	$ 7,529	$ 12,670
Securities Line | Minimum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, interest rates	0.96%	0.86%
Securities Line | Maximum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, interest rates	1.73%	1.73%

Debt - Maximum and Average Outs

Debt - Maximum and Average Outstanding, Weighted Average Interest Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Maximum balance:
Federal Home Loan Bank advances and Fed Funds	$ 70,419	$ 98,769
Federal Reserve Bank	1,000	1,000
Fed Funds lines of credit	17,501	6,000
Average balance:
Federal Home Loan Bank advances and Fed Funds	25,635	26,259
Fed Funds lines of credit	$ 876	$ 16
Weighted average interest rate:
Federal Home Loan Bank advances and Fed Funds (as a percent)	1.26%	0.98%
Federal Reserve Bank (as a percent)	1.75%	1.00%
Fed Funds lines of credit (as a percent)	1.30%	0.77%
Federal Reserve Bank, Advances, Activity for Year, Average Balance Outstanding	$ 3	$ 3
Subordinated note
Average balance:
Subordinated note	$ 10,000	$ 10,000
Weighted average interest rate:
Subordinated note (as a percent)	6.50%	6.50%
Subordinated note | Maximum
Maximum balance:
Subordinated note	$ 10,000	$ 10,000

Debt - Schedule of Federal Home

Debt - Schedule of Federal Home Loan Bank Advances Maturities Summary Due (Details) $ in Thousands	Dec. 31, 2017USD ($)
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2,018	$ 3,986
2,019	1,207
2,020	2,336
Total	$ 7,529
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]
2018, Interest Rates (percent)	1.01%
2019, Interest Rates (percent)	1.73%
2020, Interest Rates (percent)	1.71%

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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
Number of hours per service period year (in hours)	1000 hours
Employee stock ownership plan (ESOP), debt structure, employer loan, amount	$ 2,600,000
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	$ 263,000
Employee stock ownership plan (ESOP), interest payments from esop	32,000
ESOP compensation expense for allocated shares	$ 1,424,000	$ 832,000

Employee Benefits - Schedule of

Employee Benefits - Schedule of Shares Under ESOP (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Jul. 09, 2012
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated shares	153,049	126,589
Unallocated shares	103,684	129,605
Total ESOP shares	256,733	256,194	259,210
Fair value of unallocated shares (in thousands)	$ 5,696	$ 4,158

Employee Benefits - 401(K) Plan

Employee Benefits - 401(K) Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Defined Contribution Plans Disclosures [Line Items]
Defined contribution plan, minimum age requirement	18 years
Percentage vested in deferral contributions account	100.00%
Employer contributions	$ 904	$ 759
Contributions between 1% to 3%
Schedule of Defined Contribution Plans Disclosures [Line Items]
Employer matching percentage	100.00%
Contributions between 1% to 3% | Minimum
Schedule of Defined Contribution Plans Disclosures [Line Items]
Defined contribution plan, employee contribution (percent)	1.00%
Contributions between 1% to 3% | Maximum
Schedule of Defined Contribution Plans Disclosures [Line Items]
Defined contribution plan, employee contribution (percent)	3.00%
Contributions between 4% and 5%
Schedule of Defined Contribution Plans Disclosures [Line Items]
Employer matching percentage	50.00%
Contributions between 4% and 5% | Minimum
Schedule of Defined Contribution Plans Disclosures [Line Items]
Defined contribution plan, employee contribution (percent)	4.00%
Contributions between 4% and 5% | Maximum
Schedule of Defined Contribution Plans Disclosures [Line Items]
Defined contribution plan, employee contribution (percent)	5.00%

Income Taxes - Components of In

Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Provision for income taxes
Current	$ 7,212	$ 5,398
Deferred	(718)	206
Income Tax Expense (Benefit), Total	$ 6,494	$ 5,604

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax provision at statutory rate	$ 7,203	$ 5,636
Tax exempt income	(218)	(255)
Decrease in tax resulting from other items	(487)	42
Income tax rate differential	(396)
ESOP	392	181
Income Tax Expense (Benefit), Total	$ 6,494	$ 5,604
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income tax provision at statutory rate	35.00%	35.00%
Tax exempt income	(1.00%)	(1.60%)
Increase in tax resulting from other items	(2.40%)	0.30%
Income tax rate differential	(1.90%)
ESOP	1.90%	1.10%
Total	31.60%	34.80%

Income Taxes - Deferred Assets

Income Taxes - Deferred Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Allowance for loan losses	$ 1,912	$ 2,467
Non-accrued loan interest	9	3
Non-qualified stock options		159
Securities available-for-sale	130	294
Other	210	437
Total deferred tax assets	2,261	3,360
Deferred Tax Liabilities
Loan origination costs	(870)	(1,242)
Servicing rights	(1,461)	(3,003)
Prepaids	(52)	(72)
Stock dividend - FHLB stock	(1)	(1)
Property, plant, and equipment	(484)	(203)
Total deferred tax liabilities	(2,868)	(4,521)
Net deferred tax liabilities	$ (607)	$ (1,161)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Corporate federal income tax rate		35.00%	35.00%
Provisional income tax benefit		$ 396,000
Uncertain tax liabilities		0	$ 0
Recognized interest and penalties		$ 0	$ 0
Forecast
Corporate federal income tax rate	21.00%

Commitments and Contingencies -

Commitments and Contingencies - Commitment (Details) - Commitments to Extend Credit - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	$ 284,887	$ 211,705
Real Estate
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	144,091	120,302
Commercial
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	107	108
Construction and development
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	73,321	57,016
One-to-four-family (includes locks for salable loans)
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	37,336	36,623
Home equity loan
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	32,889	26,129
Commercial/Multi-family
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	438	426
Other consumer
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	10,041	8,527
Commercial business loans
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	130,755	82,876
Commercial and industrial
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	52,452	31,774
Warehouse lending
Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments	$ 78,303	$ 51,102

Commitments and Contingencies87

Commitments and Contingencies - Narrative (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2008shares	Dec. 31, 2017USD ($)action$ / shares	Dec. 31, 2016USD ($)$ / shares
Loss Contingencies [Line Items]
Amount of loans sold to FHLB		$ 39,300,000
Federal Home Loan Bank, First Loss Account Established		433,000
Bank recourse obligation		$ 1,100,000
Bank recourse obligation, percentage of loans outstanding		2.70%
Reserve as a percentage of outstanding CE		10.00%
Reserve for loans sold		$ 121,000
Outstanding Delinquencies On Loans Sold to Federal Home Loan Bank		$ 0	$ 0
Pending material legal actions | action		0
Visa, Inc.
Loss Contingencies [Line Items]
Market value of stock (in dollars per share) | $ / shares		$ 114.02	$ 77.73
Visa, Inc. | Bank
Loss Contingencies [Line Items]
Common stock, conversion ratio	1.6483
Carrying value of stock		$ 0
Visa, Inc. | Bank | Class B Common Stock
Loss Contingencies [Line Items]
Number of shares received in an IPO | shares	7,158
Commitments to Extend Credit
Loss Contingencies [Line Items]
Reserve for estimated losses		253,000	$ 179,000
Guarantee on loans sold
Loss Contingencies [Line Items]
Reserve for estimated losses		$ 1,000,000	$ 955,000
Chief Executive Officer
Loss Contingencies [Line Items]
Severance agreement, period of base compensation used to calculate lump sum payment		24 months
CFO, Chief Lending Officer, COO, and two EVPs of Home Lending
Loss Contingencies [Line Items]
Severance agreement, period of base compensation used to calculate lump sum payment		12 months
Change of control agreement, prior notice required for cancellation		24 months
Change of control agreement, change in control payment, period before change in control		6 months
Change in control payment, period after change in control		12 months

Regulatory Capital - Compliance

Regulatory Capital - Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 to Risk Weighted Assets, Capital Conservation Buffer, Phased in	1.25%	0.625%		0.625%
Common Equity Tier 1 to Risk Weighted Assets, Capital Conservation Buffer	2.50%
Total risk-based capital, Ratio	15.70%
Tier 1 risk-based capital, Ratio	14.50%
Tier 1 leverage capital, Ratio	12.10%
CET 1 capital, Ratio	14.50%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, Amount	$ 133,967		$ 93,309
Total risk-based capital, Ratio	16.25%		13.87%
Total risk-based capital, For Capital Adequacy Purposes, Amount	$ 65,965		$ 53,813
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%		8.00%
Total risk-based capital, For Capital Adequacy with Capital Buffer, Amount	$ 76,272		$ 58,051
Total risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	9.25%		8.63%
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 82,456		$ 67,266
Total risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%		10.00%
Tier 1 risk-based capital, Amount	$ 123,651		$ 84,876
Tier 1 risk-based capital, Ratio	15.00%		12.62%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Amount	$ 49,474		$ 40,360
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	$ 59,781		$ 44,597
Tier 1 risk-based capital, For Capital Adequacy with Capital Buffer, Ratio	7.25%		6.63%
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 65,965		$ 53,813
Tier 1 risk-based capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%		8.00%
Tier 1 leverage capital	$ 123,651		$ 84,876
Tier 1 leverage capital, Ratio	12.61%		10.33%
Tier 1 leverage capital, For Capital Adequacy Purposes, Amount	$ 39,233		$ 32,862
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	$ 49,041		$ 41,078
Tier 1 leverage capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%		5.00%
CET 1 capital, Amount	$ 123,651		$ 84,876
CET 1 capital, Ratio	15.00%		12.62%
CET 1 capital, For Capital Adequacy Purposes, Amount	$ 37,105		$ 30,270
CET 1 capital, For Capital Adequacy Purposes, Ratio	4.50%		4.50%
CET 1 capital, For Capital Adequacy with Capital Buffer, Amount	$ 47,412		$ 34,508
CET 1 capital, For Capital Adequacy with Capital Buffer, Ratio	5.75%		5.13%
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 53,597		$ 43,723
CET 1 capital, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%		6.50%

Fair Value of Financial Instr89

Fair Value of Financial Instruments - Available for Sale Securities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 82,480	$ 81,875
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	82,480	81,875
Fair Value, Measurements, Recurring | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	9,115	8,068
Fair Value, Measurements, Recurring | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	7,026	7,500
Fair Value, Measurements, Recurring | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	12,786	15,264
Fair Value, Measurements, Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	39,734	45,195
Fair Value, Measurements, Recurring | 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	13,819	5,848
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	82,480	81,875
Fair Value, Measurements, Recurring | 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	9,115	8,068
Fair Value, Measurements, Recurring | Level 2 | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	7,026	7,500
Fair Value, Measurements, Recurring | Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	12,786	15,264
Fair Value, Measurements, Recurring | 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	39,734	45,195
Fair Value, Measurements, Recurring | 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	$ 13,819	$ 5,848

Fair Value of Financial Instr90

Fair Value of Financial Instruments - Mortgage loans held for sale (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	$ 53,463	$ 52,553
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	$ 53,463	$ 52,553

Fair Value of Financial Instr91

Fair Value of Financial Instruments - Interest Rate Lock Commitments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	$ 726	$ 818
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Lock Commitments with Customers	$ 726	$ 818

Fair Value of Financial Instr92

Fair Value of Financial Instruments - Forward Sale Commitments with Investors (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	$ (14)	$ 672
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	(65)	495
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individual Forward Sale Commitments with Investors	$ 51	$ 177

Fair Value of Financial Instr93

Fair Value of Financial Instruments - Impaired Loans and OREO (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, fair value	$ 1,094	$ 194
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, fair value	$ 1,094	$ 194

Fair Value of Financial Instr94

Fair Value of Financial Instruments - Discount Rate (Details) - Level 3	12 Months Ended
	Dec. 31, 2017
Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Quoted Market Prices | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	80.00%
Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Quoted Market Prices | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	99.00%
Fair Value, Measurements, Recurring | Fallout adjusted interest rate lock commitments with customers | Quoted Market Prices | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	94.80%
Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Quoted Market Prices | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	80.00%
Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Quoted Market Prices | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	99.00%
Fair Value, Measurements, Recurring | Mandatory and best effort forward commitments with investors | Quoted Market Prices | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	94.80%
Fair Value, Measurements, Nonrecurring | Fair Value of Underlying Collateral | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	0.00%
Fair Value, Measurements, Nonrecurring | Fair Value of Underlying Collateral | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	18.00%
Fair Value, Measurements, Nonrecurring | Fair Value of Underlying Collateral | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Instrument	0.00%

Fair Value of Financial Instr95

Fair Value of Financial Instruments - Fair Value Level 3 on recurring basis (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fallout adjusted interest rate lock commitments with customers
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 818	$ 698
Purchases and Issuances	14,319	16,793
Sales and Settlements	(14,411)	(16,673)
Ending Balance	726	818
Net change in fair value for gains/(losses) relating to items held at end of period	(92)	120
Mandatory and best effort forward commitments with investors
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	177	74
Purchases and Issuances	141	175
Sales and Settlements	(267)	(72)
Ending Balance	51	177
Net change in fair value for gains/(losses) relating to items held at end of period	$ (126)	$ 103

Fair Value of Financial Instr96

Fair Value of Financial Instruments - Fair Value By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial Assets
Certificates of deposit at other financial institutions	$ 18,108	$ 15,248
Securities available-for-sale, at fair value	82,480	81,875
Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	82,480	81,875
Loans held for sale, at fair value	53,463	52,553
Paired off commitments with investors	53	747
Fair Value, Measurements, Nonrecurring
Financial Assets
Impaired Loans, fair value	1,094	194
Level 2 | Fair Value, Measurements, Recurring
Financial Assets
Securities available-for-sale, at fair value	82,480	81,875
Loans held for sale, at fair value	53,463	52,553
Paired off commitments with investors	53	747
Level 3 | Fair Value, Measurements, Nonrecurring
Financial Assets
Impaired Loans, fair value	1,094	194
Carrying Amount
Financial Liabilities
Accrued interest payable	214	192
Paired Off Commitments with Investors	65
Carrying Amount | Level 1
Financial Assets
Cash and cash equivalents	18,915	36,456
Certificates of deposit at other financial institutions	18,108	15,248
Carrying Amount | Level 2
Financial Assets
Securities available-for-sale, at fair value	82,480	81,875
Loans held for sale, at fair value	53,463	52,553
FHLB stock, at cost	2,871	2,719
Accrued interest receivable	3,566	2,524
Individual forward sale commitments with investors		495
Paired off commitments with investors	53	747
Financial Liabilities
Deposits	829,842	712,593
Borrowings	7,529	12,670
Subordinated note, net	9,845	9,825
Carrying Amount | Level 3
Financial Assets
Loans receivable, gross	773,445	605,415
Servicing rights, held at lower of cost or fair value	6,795	8,459
Fair value interest rate locks with customers	726	818
Individual forward sale commitments with investors	51	177
Fair Value
Financial Liabilities
Accrued interest payable	214	192
Paired Off Commitments with Investors	65
Fair Value | Level 1
Financial Assets
Cash and cash equivalents	18,915	36,456
Certificates of deposit at other financial institutions	18,108	15,248
Fair Value | Level 2
Financial Assets
Securities available-for-sale, at fair value	82,480	81,875
Loans held for sale, at fair value	53,463	52,553
FHLB stock, at cost	2,871	2,719
Accrued interest receivable	3,566	2,524
Individual forward sale commitments with investors		495
Paired off commitments with investors	53	747
Financial Liabilities
Deposits	838,087	718,970
Borrowings	7,498	12,660
Subordinated note, net	10,741	9,805
Fair Value | Level 3
Financial Assets
Loans receivable, gross	780,551	617,630
Servicing rights, held at lower of cost or fair value	8,608	11,741
Fair value interest rate locks with customers	726	818
Individual forward sale commitments with investors	$ 51	$ 177

Earnings Per Share - Earnings P

Earnings Per Share - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income	$ 14,085	$ 10,499
Basic weighted average common shares outstanding	3,094,586	2,896,209
Dilutive shares (in shares)	197,114	93,950
Diluted weighted average common shares outstanding	3,291,700	2,990,159
Basic earnings per share (in dollars per share)	$ 4.55	$ 3.63
Diluted earnings per share (in dollars per share)	$ 4.28	$ 3.51

Derivatives (Details)

Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Margin Cash Collateral	$ 75,000	$ 0
Derivatives, fair value changes, gain on sale of loans	2,300	3,100
Not Designated as Hedging Instrument | Fallout adjusted interest rate lock commitments with customers
Derivative [Line Items]
Notional	31,951	33,289
Fair Value, Asset	726	818
Not Designated as Hedging Instrument | Mandatory and best effort forward commitments with investors
Derivative [Line Items]
Notional	12,505	23,536
Fair Value, Asset	51	177
Not Designated as Hedging Instrument | Forward TBA mortgage-backed securities
Derivative [Line Items]
Notional	66,500	53,000
Fair Value, Asset		495
Fair Value, Liability	65
Not Designated as Hedging Instrument | TBA mortgage-backed securities forward sales paired off with investors
Derivative [Line Items]
Notional	36,500	44,000
Fair Value, Asset	$ 53	$ 747

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	Jan. 01, 2016	May 08, 2014	Sep. 30, 2013	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual life				10 years
Shares available for grant				6,013
Expected forfeiture rate over contractual term				3.1
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Total intrinsic value of options exercised				$ 1,113,997	$ 106,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, nonvested awards				$ 311,000
Unrecognized compensation cost, period for recognition				1 year 4 months 24 days
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, period for recognition				1 year 3 months 18 days
Total fair value of shares vested				$ 1,400,000	761,000
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				634,000	783,000
Income tax benefit from share-based compensation expense				$ 222,000	$ 274,000
2013 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)			324,013
Market value of stock (in dollars per share)		$ 16.89
Award vesting period				5 years
Annual award vesting percentage				20.00%
Award contractual life				10 years
Expiration period				10 years
Granted (in shares)			322,000
Stock option, fair value assumption, expected life				6 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
2013 Equity Incentive Plan | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		125,105
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
Market value of stock (in dollars per share)	$ 26	$ 16.89
Unrecognized compensation cost, nonvested awards				$ 427,000
Remaining awards granted (in shares)	4,500
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

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares
Outstanding, beginning balance (in shares)	295,850
Less exercised (in shares)	39,613
Outstanding, ending balance (in shares)	256,237	295,850
Expected to vest, assuming a 0.31% annual forfeiture rate (in shares)	255,902
Exercisable (in shares)	129,437
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 16.89
Less exercised (in dollars per share)	16.89
Outstanding, ending balance (in dollars per share)	16.89	$ 16.89
Expected to vest, assuming a 0.31% annual forfeiture rate (in dollars per share)	16.89
Exercisable (in dollars per share)	$ 16.89
Weighted-Average Remaining Contractual Term In Years
Outstanding, ending balance	6 years 4 months 10 days
Expected to vest, assuming a 0.31% annual forfeiture rate, Weighted Average Remaining Contractual Term	6 years 4 months 10 days
Exercisable	6 years 4 months 10 days
Aggregate Intrinsic Value
Beginning balance	$ 5,638,901
Less exercised	1,113,997	$ 106,000
Ending balance	9,655,010	$ 5,638,901
Expected to vest, assuming a 0.31% annual forfeiture rate	9,642,373
Exercisable	$ 4,877,186
2013 Equity Incentive Plan
Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expected Forfeiture Rate		0.31%
Weighted-Average Remaining Contractual Term In Years
Outstanding, ending balance		7 years 4 months 10 days

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Awards (Details) - Restricted stock awards	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Shares
Nonvested, Beginning balance (in shares) | shares	68,763
Less vested (in shares) | shares	31,921
Nonvested, Ending balance (in shares) | shares	36,842
Weighted-Average Grant-Date Fair Value Per Share
Nonvested, Beginning balance (in dollars per share) | $ / shares	$ 17.49
Less vested (in dollars per share) | $ / shares	17.32
Nonvested, Ending balance (in dollars per share) | $ / shares	$ 17.63

Business Segments - Narrative (

Business Segments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)segmentitem	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Deposits	$ 829,842	$ 712,593
Commercial and Consumer Banking
Segment Reporting Information [Line Items]
Deposits	$ 829,800	$ 712,600
Commercial and Consumer Banking | Retail Deposit | Pacific Northwest
Segment Reporting Information [Line Items]
Number of bank branches | item	11

Business Segments - Segment Fin

Business Segments - Segment Financial Results (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)item
Segment Reporting Information [Line Items]
Net interest income	$ 41,248	$ 33,857
Provision for loan losses	(750)	(2,400)
Noninterest income	24,074	23,569
Noninterest expense	(43,993)	(38,923)
INCOME BEFORE PROVISION FOR INCOME TAXES	20,579	16,103
Provision for income taxes	(6,494)	(5,604)
NET INCOME	14,085	10,499
TOTAL ASSETS	981,783	827,926
Total average assets at quarter end	$ 923,581	$ 799,020
FTEs | item	326	306
Home Lending
Segment Reporting Information [Line Items]
Net interest income	$ 2,587	$ 2,221
Provision for loan losses	(287)	(208)
Noninterest income	18,973	19,195
Noninterest expense	(17,052)	(14,944)
INCOME BEFORE PROVISION FOR INCOME TAXES	4,221	6,264
Provision for income taxes	(1,332)	(2,180)
NET INCOME	2,889	4,084
TOTAL ASSETS	220,353	184,003
Total average assets at quarter end	$ 203,379	$ 153,812
FTEs | item	119	112
Commercial and Consumer Banking
Segment Reporting Information [Line Items]
Net interest income	$ 38,661	$ 31,636
Provision for loan losses	(463)	(2,192)
Noninterest income	5,101	4,374
Noninterest expense	(26,941)	(23,979)
INCOME BEFORE PROVISION FOR INCOME TAXES	16,358	9,839
Provision for income taxes	(5,162)	(3,424)
NET INCOME	11,196	6,415
TOTAL ASSETS	761,430	643,923
Total average assets at quarter end	$ 720,202	$ 645,208
FTEs | item	207	194

Regulatory Capital - Regulatory

Regulatory Capital - Regulatory Capital Ratios Policy (Details)	Dec. 31, 2017	Jan. 01, 2017	Jan. 01, 2016
Regulatory Capital Requirements [Abstract]
CET 1 capital conversion buffer phased in	1.25%	0.625%	0.625%
Tier 1 leverage capital, Ratio	12.10%
Tier 1 risk-based capital, Ratio	14.50%
Total risk-based capital, Ratio	15.70%
CET 1 capital, Ratio	14.50%