Waterstone Financial (WSBF) 10-Q 30 Apr 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 26, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Waterstone Financial, Inc.
Entity Central Index Key	1,569,994
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 557.1
Entity Common Stock, Shares Outstanding		29,316,907
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash	$ 53,000	$ 22,306
Federal funds sold	27,143	17,034
Interest-earning deposits in other financial institutions and other short term investments	3,264	9,267
Cash and cash equivalents	83,407	48,607
Securities available for sale (at fair value)	186,983	199,707
Loans held for sale (at fair value)	127,638	149,896
Loans receivable	1,314,672	1,291,814
Less: Allowance for loan losses	13,190	14,077
Loans receivable, net	1,301,482	1,277,737
Office properties and equipment, net	22,592	22,941
Federal Home Loan Bank stock (at cost)	18,675	16,875
CSV of line insurance	66,324	65,996
Real estate owned, net	3,374	4,558
Prepaid expenses and other assets	28,789	20,084
Total assets	1,839,264	1,806,401
Liabilities:
Demand deposits	131,520	129,597
Money market and savings deposits	145,506	148,804
Time deposits	697,198	688,979
Total deposits	974,224	967,380
Borrowings	434,365	386,285
Advance payments by borrowers for taxes	12,004	4,876
Other liabilities	21,252	35,756
Total liabilities	1,441,845	1,394,297
Shareholders' equity:
Preferred stock (par value $.01 per share) Authorized - 50,000,000 shares in 2017 and in 2016, no shares issued	0	0
Common stock (par value $.01 per share) Authorized - 100,000,000 shares in 2017 and in 2016, Issued - 29,554,466 in 2017 and 29,430,123 in 2016, Outstanding - 29,554,466 in 2017 and 29,430,123 in 2016	293	295
Additional paid-in capital	327,748	326,655
Retained earnings	173,163	183,358
Unearned ESOP shares	(18,694)	(18,991)
Accumulated other comprehensive income (loss), net of taxes	(2,631)	(477)
Cost of shares repurchased (5,957,833 shares at September 30, 2017 and 5,908,150 shares at December 31, 2016)	(82,460)	(78,736)
Total shareholders' equity	397,419	412,104
Total liabilities and shareholders' equity	$ 1,839,264	$ 1,806,401

CONSOLIDATED STATEMENTS OF FIN3

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Shareholders' equity:
Preferred stock - par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock - shares authorized (in shares)	50,000,000	50,000,000
Preferred stock - shares issued (in shares)	0	0
Common stock - par value (in dollars per share)	$ 0.01	$ 0.01
Common stock - shares authorized (in shares)	100,000,000	100,000,000
Common stock - shares issued (in shares)	29,323,807	29,501,346
Common stock - shares outstanding (in shares)	29,323,807	29,501,346
Treasury shares (in shares)	6,247,819	6,030,900

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Loans	$ 15,458,000	$ 14,238,000
Mortgage-related securities	638,000	696,000
Debt securities, federal funds sold and short-term investments	867,000	852,000
Total interest income	16,963,000	15,786,000
Interest expense:
Deposits	2,314,000	1,795,000
Borrowings	1,508,000	2,096,000
Total interest expense	3,822,000	3,891,000
Net interest income	13,141,000	11,895,000
Provision for loan losses	(880,000)	(1,211,000)
Net interest income after provision for loan losses	14,021,000	13,106,000
Noninterest income:
Service charges on loans and deposits	399,000	367,000
Increase in cash surrender value of life insurance	328,000	318,000
Loss on sale of securities	(1)
Mortgage banking income	24,187,000	24,687,000
Other	269,000	565,000
Total noninterest income	25,183,000	25,937,000
Noninterest expenses:
Compensation, payroll taxes, and other employee benefits	20,983,000	19,995,000
Occupancy, office furniture and equipment	2,639,000	2,527,000
Advertising	860,000	724,000
Data processing	625,000	598,000
Communications	382,000	379,000
Professional fees	700,000	607,000
Real estate owned	317,000	411,000
FDIC insurance premiums	125,000	120,000
Other	3,516,000	3,697,000
Total noninterest expenses	30,147,000	29,058,000
Income before income tax	9,057,000	9,985,000
Income tax expense	2,104,000	3,413,000
Net income	$ 6,953,000	$ 6,572,000
Income per share:
Basic (in dollars per share)	$ 0.25	$ 0.24
Diluted (in dollars per share)	$ 0.25	$ 0.24
Weighted average shares outstanding:
Basic (in shares)	27,509	27,323
Diluted (in shares)	27,802	27,867

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income	$ 6,953	$ 6,572
Net unrealized holding gain on available for sale securities:
Net unrealized holding gain arising during the period, net of tax expense of ($204), ($528), ($356), ($1,728), respectively	(2,159)	234
Reclassification for net deferred tax liability revaluation	5	0
Total other comprehensive income	(2,154)	234
Comprehensive income	$ 4,799	$ 6,806

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other comprehensive income (loss), net of tax
Net unrealized holding gain (loss) on available for sale securities arising during the period, net of tax (expense) benefit	$ 812	$ (153)
Reclassification adjustment for net gains on available for sale securities realized during the period, net of taxes	$ 0	$ 0

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Unearned ESOP Shares [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Cost of Shares Repurchased [Member]	Total
Balances at Dec. 31, 2016	$ 294	$ 322,934	$ 184,565	$ (20,178)	$ (378)	$ (76,547)	$ 410,690
Balances (in shares) at Dec. 31, 2016	29,430,000
Comprehensive income:
Net income (loss)	$ 0	0	6,572	0	0	0	6,572
Other comprehensive income	0	0	0	0	234	0	234
Total comprehensive income							6,806
Reclassification for net deferred tax liability revaluation							0
ESOP shares committed to be released to Plan participants	0	185	0	297	0	0	482
Cash dividend	0	0	(3,320)	0	0	0	(3,320)
Stock based compensation expense	$ 1	453	0	0	0	0	454
Stock compensation activity, net of tax (in shares)	50,000
Stock compensation expense	$ 0	474	0	0	0	0	474
Purchase of common stock returned to authorized but unissued	$ 0	0	0	0	0	(524)	(524)
Purchase of common stock returned to authorized but unissued (in shares)	(29,000)
Balances at Mar. 31, 2017	$ 295	324,046	187,817	(19,881)	(144)	(77,071)	415,062
Balances (in shares) at Mar. 31, 2017	29,451,000
Balances at Dec. 31, 2017	$ 295	326,655	183,358	(18,991)	(477)	(78,736)	$ 412,104
Balances (in shares) at Dec. 31, 2017	29,501,000						29,501,346
Comprehensive income:
Net income (loss)	$ 0	0	6,953	0	0	0	$ 6,953
Other comprehensive income	0	0	0	0	(2,154)	0	(2,154)
Total comprehensive income							4,799
Reclassification for net deferred tax liability revaluation	0	0	(5)	0	0	0	(5)
ESOP shares committed to be released to Plan participants	0	159	0	297	0	0	456
Cash dividend	0	0	(17,143)	0	0	0	(17,143)
Stock based compensation expense	$ 0	494	0	0	0	0	494
Stock compensation activity, net of tax (in shares)	40,000
Stock compensation expense	$ 0	440	0	0	0	0	440
Purchase of common stock returned to authorized but unissued	$ (2)	0	0	0	0	(3,724)	(3,726)
Purchase of common stock returned to authorized but unissued (in shares)	(217,000)
Balances at Mar. 31, 2018	$ 293	$ 327,748	$ 173,163	$ (18,694)	$ (2,631)	$ (82,460)	$ 397,419
Balances (in shares) at Mar. 31, 2018	29,324,000						29,323,807

CONSOLIDATED STATEMENTS OF CHA8

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) [Abstract]
Cash dividends (in dollars per share)	$ 0.62	$ 0.12

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net income (loss)	$ 6,953,000	$ 6,572,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	(880,000)	(1,211,000)
Provision for depreciation	558,000	520,000
Stock based compensation	440,000	474,000
Net amortization of premium/discount on debt and mortgage related securities	148,000	190,000
Amortization of unearned ESOP shares	456,000	482,000
Amortization and impairment of mortgage servicing rights	49,000	19,000
Gain on sale of loans held for sale	(20,684,000)	(21,647,000)
Loans originated for sale	(489,155,000)	(481,313,000)
Proceeds on sales of loans originated for sale	532,097,000	608,482,000
Increase in accrued interest receivable	(273,000)	(319,000)
Increase in cash surrender value of life insurance	(328,000)	(318,000)
Increase (decrease) in accrued interest on deposits and borrowings	18,000	(70,000)
(Decrease) increase in other liabilities	(2,166,000)	(3,877,000)
Increase in accrued tax receivable	(783,000)	(1,089,000)
Loss on sale of securities	1
Net loss related to real estate owned	201,000	315,000
Gain on sale of mortgage servicing rights	0	(308,000)
Other	(6,854,000)	(1,606,000)
Net cash provided by (used in) operating activities	19,797,000	105,296,000
Investing activities:
Net increase in loans receivable	(23,103,000)	(17,469,000)
Net change on FHLB stock	(1,800,000)	1,350,000
Purchases of:
Mortgage related securities	0	(4,976,000)
Premises and equipment, net	(221,000)	(505,000)
Proceeds from:
Principal repayments on mortgage-related securities	7,245,000	8,357,000
Maturities of debt securities	2,365,000	1,485,000
Sales of real estate owned	1,197,000	1,134,000
Net cash used in investing activities	(14,317,000)	(10,624,000)
Financing activities:
Net (decrease) increase in deposits	6,844,000	(3,370,000)
Net change in short-term borrowings	(16,920,000)	(28,391,000)
Repayment of long term debt	65,000,000	(24,000,000)
Net change in advance payments by borrowers for taxes	(5,184,000)	(8,156,000)
Cash dividends on common stock	(17,188,000)	(3,274,000)
Purchase of common stock returned to authorized but unissued	(3,726,000)	(524,000)
Proceeds from stock option exercises	494,000	454,000
Net cash provided by financing activities	29,320,000	(67,261,000)
Increase (decrease) in cash and cash equivalents	34,800,000	27,411,000
Cash and cash equivalents at beginning of period	48,607,000	47,217,000
Cash and cash equivalents at end of period	83,407,000	74,628,000
Cash paid or credited during the period for:
Income tax payments	2,384,000	5,042,000
Interest payments	3,804,000	3,961,000
Noncash activities:
Loans receivable transferred to real estate owned	238,000	416,000
Dividends declared but not paid in other liabilities	$ 3,850,000	$ 3,722,000

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Basis of Presentation [Abstract]
Basis of Presentation	The unaudited interim consolidated financial statements include the accounts of Waterstone Financial, Inc. (the "Company") and the Company's subsidiaries. WaterStone Bank SSB (the "Bank") is a community bank that has served the banking needs of its customers since 1921. WaterStone Bank also has an active mortgage banking subsidiary, Waterstone Mortgage Corporation. WaterStone Bank conducts its community banking business from 11 banking offices located in Milwaukee, Washington and Waukesha Counties, Wisconsin, as well as a loan production office in Minneapolis, Minnesota. WaterStone Bank's principal lending activity is originating one- to four-family, multi-family residential real estate, and commercial real estate loans for retention in its portfolio. WaterStone Bank also offers home equity loans and lines of credit, construction and land loans, and commercial business loans, and consumer loans. WaterStone Bank funds its loan production primarily with retail deposits and Federal Home Loan Bank advances. Our deposit offerings include: certificates of deposit, money market savings accounts, transaction deposit accounts, non-interest bearing demand accounts and individual retirement accounts. Our investment securities portfolio is comprised principally of mortgage-backed securities, government-sponsored enterprise bonds and municipal obligations. WaterStone Bank's mortgage banking operations are conducted through its wholly-owned subsidiary, Waterstone Mortgage Corporation. Waterstone Mortgage Corporation originates single-family residential real estate loans for sale into the secondary market. Waterstone Mortgage Corporation utilizes lines of credit provided by WaterStone Bank as a primary source of funds, and also utilizes a line of credit with another financial institution as needed. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles ("GAAP") for interim financial information, Rule 10-01 of Regulation S-X and the instructions to Form 10-Q. The financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring accruals) necessary to present fairly the financial position, results of operations, changes in shareholders' equity, and cash flows of the Company for the periods presented. The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with the Company's December 31, 2017 Annual Report on Form 10-K. Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 or for any other period. The preparation of the unaudited consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include the allowance for loan losses, deferred income taxes and real estate owned. Actual results could differ from those estimates. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or shareholders' equity. Impact of Recent Accounting Pronouncements Accounting Standards Codification ("ASC") Topic 606 "Revenue from Contracts with Customers." Authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize 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 and to provide clarification on identifying performance obligations and licensing implementation guidance. The Company's revenue is comprised of interest and non-interest revenue. The majority of our revenue generating transactions are not subject to ASC 606, including revenue generated from financial instruments, such as our loans, letters of credit, investment securities, bank owned life insurance and gains on sales of loans held for sale. The Company completed its overall assessment of revenue streams and related contracts affected by the guidance and adopted ASC 606 on January 1, 2018 with no impact on total shareholders' equity or net income. Revenue Recognition The Company recognizes revenue as it is earned and noted no impact to its revenue recognition policies as a result of the adotpion of ASC 606. The following is a discussion of revenues within the scope of the new revenue guidance: ● Debit and credit card interchange fee income ● Service charges on deposit accounts ● Service charges on loan accounts ASC Topic 825 "Financial Instruments." ASC Topic 842 "Leases." ASC Topic 326 "Financial Instruments - Credit Losses." ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." ASC Topic 220 "Income Statement - Reporting Comprehensive Income."

Securities Available for Sale

Securities Available for Sale	3 Months Ended
	Mar. 31, 2018
Securities Available for Sale [Abstract]
Securities Available for Sale	Note 2— Securities Available for Sale The amortized cost and fair values of the Company's investment in securities available for sale follow: March 31, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (In Thousands) Mortgage-backed securities $ 53,198 $ 157 $ (772 ) $ 52,583 Collateralized mortgage obligations: Government sponsored enterprise issued 58,158 1 (1,489 ) 56,670 Mortgage-related securities 111,356 158 (2,261 ) 109,253 Government sponsored enterprise bonds 500 - (2 ) 498 Municipal securities 62,312 674 (203 ) 62,783 Other debt securities 15,004 - (1,290 ) 13,714 Debt securities 77,816 674 (1,495 ) 76,995 Certificates of deposit 735 - - 735 $ 189,907 $ 832 $ (3,756 ) $ 186,983 December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (In Thousands) Mortgage-backed securities $ 57,351 $ 324 $ (240 ) $ 57,435 Collateralized mortgage obligations: Government sponsored enterprise issued 61,313 3 (816 ) 60,500 Mortgage-related securities 118,664 327 (1,056 ) 117,935 Government sponsored enterprise bonds 2,500 - (3 ) 2,497 Municipal securities 62,516 1,334 (81 ) 63,769 Other debt securities 15,005 12 (492 ) 14,525 Debt securities 80,021 1,346 (576 ) 80,791 Certificates of deposit 980 1 - 981 $ 199,665 $ 1,674 $ (1,632 ) $ 199,707 The Company's mortgage-backed securities and collateralized mortgage obligations issued by government sponsored enterprises are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. At March 31, 2018, $2.3 million of the Company's mortgage related securities were pledged as collateral to secure At December 31, 2017, of the Company's mortgage related securities were pledged as collateral to secure The amortized cost and fair values of investment securities by contractual maturity at March 31, 2018 are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Fair Value (In Thousands) Debt and other securities Due within one year $ 8,202 $ 8,178 Due after one year through five years 24,745 24,628 Due after five years through ten years 33,943 34,456 Due after ten years 11,661 10,468 Mortgage-related securities 111,356 109,253 $ 189,907 $ 186,983 Gross unrealized losses on securities available for sale and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows: March 31, 2018 Less than 12 months 12 months or longer Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss (In Thousands) Mortgage-backed securities $ 40,078 $ (595 ) $ 4,180 $ (177 ) $ 44,258 $ (772 ) Collateralized mortgage obligations: Government sponsored enterprise issued 35,746 (780 ) 20,319 (709 ) 56,065 (1,489 ) Government sponsored enterprise bonds 498 (2 ) - - 498 (2 ) Municipal securities 28,006 (201 ) 100 (2 ) 28,106 (203 ) Other debt securities 4,975 (29 ) 8,739 (1,261 ) 13,714 (1,290 ) Certificates of deposit - - - - - - $ 109,303 $ (1,607 ) $ 33,338 $ (2,149 ) $ 142,641 $ (3,756 ) December 31, 2017 Less than 12 months 12 months or longer Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss (In Thousands) Mortgage-backed securities $ 35,136 $ (143 ) $ 4,464 $ (97 ) $ 39,600 $ (240 ) Collateralized mortgage obligations: Government sponsored enterprise issued 37,949 (348 ) 21,651 (468 ) 59,600 (816 ) Government sponsored enterprise bonds 2,497 (3 ) - - 2,497 (3 ) Municipal securities 17,096 (80 ) 100 (1 ) 17,196 (81 ) Other debt securities - - 9,508 (492 ) 9,508 (492 ) Certificates of deposit - - - - - - $ 92,678 $ (574 ) $ 35,723 $ (1,058 ) $ 128,401 $ (1,632 ) The Company reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. In evaluating whether a security's decline in market value is other-than-temporary, management considers the length of time and extent to which the fair value has been less than cost, the financial condition of the issuer and the underlying obligors, quality of credit enhancements, volatility of the fair value of the security, the expected recovery period of the security and ratings agency evaluations. In addition, the Company may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds and the value of any underlying collateral. The following table presents the change in other-than-temporary credit related impairment charges on securities available for sale for which a portion of the other-than-temporary impairments related to other factors was recognized in other comprehensive loss. (In Thousands) Credit-related impairments on securities as of December 31, 2016 $ 94 Credit-related impairments related to securities for which an other- than-temporary impairment was not previously recognized - Credit-related impairments on securities as of December 31, 2017 94 Credit-related impairments related to securities for which an other- than-temporary impairment was not previously recognized - Credit-related impairments on securities as of March 31, 2018 $ 94 As of March 31, 2018, the Company held one municipal security that had previously been deemed to be other-than-temporarily impaired. The security was issued by a tax incremental district in a municipality located in Wisconsin. During the year ended December 31, 2012, the Company received audited financial statements with respect to the municipal issuer that called into question the ability of the underlying taxing district that issued the security to operate as a going concern. During the year ended December 31, 2012, the Company's analysis of this security resulted in $77,000 in credit losses charged to earnings with respect to this municipal security. An additional $17,000 credit loss was charged to earnings during the year ended December 31, 2014 with respect to this security as a sale occurred at a discounted price. As of March 31, 2018, this security had an amortized cost of $116,000 and total life-to-date impairment of $94,000. As of March 31, 2018, the Company had five mortgage-backed securities, 14 government sponsored enterprise issued securities, one municipal bond security, and one corporate debt security which had been in an unrealized loss position for twelve months or longer and represents a loss of 2.6% of the aggregate amortized cost. These securities were determined not to be other-than-temporarily impaired as of March 31, 2018. The Company has determined that the decline in fair value of these securities is primarily attributable to an increase in market interest rates compared to the stated rates on these securities and is not attributable to credit deterioration. As the Company does not intend to sell nor is it more likely than not that it will be required to sell these securities before recovery of the amortized cost basis, these securities are not considered other-than-temporarily impaired. Deterioration of general economic market conditions could result in the recognition of future other than temporary impairment losses within the investment portfolio and such amounts could be material to our consolidated financial statements. During the three months ended March 31, 2018 and March 31, 2017, there were no sales of securities.

Loans Receivable

Loans Receivable	3 Months Ended
	Mar. 31, 2018
Loan Receivable [Abstract]
Loans Receivable	Note 3 - Loans Receivable Loans receivable at March 31, 2018 and December 31, 2017 are summarized as follows: March 31, 2018 December 31, 2017 (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 457,254 $ 439,597 Multi-family 571,690 578,440 Home equity 21,012 21,124 Construction and land 19,151 19,859 Commercial real estate 211,476 195,842 Consumer 240 255 Commercial loans 33,849 36,697 $ 1,314,672 $ 1,291,814 The Company provides several types of loans to its customers, including residential, construction, commercial and consumer loans. Significant loan concentrations are considered to exist for a financial institution when there are amounts loaned to one borrower or to multiple borrowers engaged in similar activities that would cause them to be similarly impacted by economic or other conditions. While the Company's credit risks are geographically concentrated in the Milwaukee metropolitan area, there are no concentrations with individual or groups of related borrowers. Qualifying loans receivable totaling $979.1 million and $971.3 million at March 31, 2018 and December 31, 2017, respectively, are pledged as collateral against $415.0 million and $375.0 million in outstanding Federal Home Loan Bank of Chicago ("FHLBC") advances under a blanket security agreement at March 31, 2018 and December 31, 2017. Certain of the Company's executive officers, directors, employees, and their related interests have loans with the Bank. As of March 31, 2018 and December 31, 2017, loans aggregating approximately $4.3 million and $4.5 million, respectively, were outstanding to such parties. None of these loans were considered impaired as of March 31, 2018 or December 31, 2017. As of March 31, 2018 and December 31, 2017, there were no loans 90 or more days past due and still accruing interest. An analysis of past due loans receivable as of March 31, 2018 and December 31, 2017 follows: As of March 31, 2018 1-59 Days Past Due (1) 60-89 Days Past Due (2) 90 Days or Greater Total Past Due Current (3) Total Loans (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 1,950 $ - $ 3,870 $ 5,820 $ 451,434 $ 457,254 Multi-family 15 - 386 401 571,289 571,690 Home equity 350 30 74 454 20,558 21,012 Construction and land - - - - 19,151 19,151 Commercial real estate - - 180 180 211,296 211,476 Consumer 46 - - 46 194 240 Commercial loans - - 26 26 33,823 33,849 Total $ 2,361 $ 30 $ 4,536 $ 6,927 $ 1,307,745 $ 1,314,672 As of December 31, 2017 1-59 Days Past Due (1) 60-89 Days Past Due (2) 90 Days or Greater Total Past Due Current (3) Total Loans (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 1,494 $ 146 $ 3,516 $ 5,156 $ 434,441 $ 439,597 Multi-family - 128 192 320 578,120 578,440 Home equity 68 - 56 124 21,000 21,124 Construction and land - - - - 19,859 19,859 Commercial real estate - - 184 184 195,658 195,842 Consumer - - - - 255 255 Commercial loans - 42 26 68 36,629 36,697 Total $ 1,562 $ 316 $ 3,974 $ 5,852 $ 1,285,962 $ 1,291,814 (1) Includes $109,000 and $241,000 at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status. (2) Includes $- and $15,000 at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status. (3) Includes $1.9 million and $1.8 million at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status. A summary of the activity for the three months ended March 31, 2018 and 2017 in the allowance for loan losses follows: One- to Four- Family Multi-Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Three months ended March 31, 2018 Balance at beginning of period $ 5,794 $ 4,431 $ 356 $ 949 $ 1,881 $ 10 $ 656 $ 14,077 Provision (credit) for loan losses 58 (514 ) (19 ) (247 ) 25 (1 ) (182 ) (880 ) Charge-offs (60 ) - - - - - - (60 ) Recoveries 32 13 7 - 1 - - 53 Balance at end of period $ 5,824 $ 3,930 $ 344 $ 702 $ 1,907 $ 9 $ 474 $ 13,190 Three months ended March 31, 2017 Balance at beginning of period $ 7,164 $ 4,809 $ 364 $ 1,016 $ 1,951 $ 12 $ 713 $ 16,029 Provision (credit) for loan losses (328 ) (470 ) 13 (10 ) (306 ) (1 ) (109 ) (1,211 ) Charge-offs (213 ) (5 ) - - - - - (218 ) Recoveries 88 22 7 13 - - - 130 Balance at end of period $ 6,711 $ 4,356 $ 384 $ 1,019 $ 1,645 $ 11 $ 604 $ 14,730 A summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class as of March 31, 2018 follows: One- to Four- Family Multi- Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Allowance related to loans individually evaluated for impairment $ 84 $ - $ 55 $ - $ 30 $ - $ - $ 169 Allowance related to loans collectively evaluated for impairment 5,740 3,930 289 702 1,877 9 474 13,021 Balance at end of period $ 5,824 $ 3,930 $ 344 $ 702 $ 1,907 $ 9 $ 474 $ 13,190 Loans individually evaluated for impairment $ 5,051 $ 1,179 $ 153 $ - $ 180 $ - $ 26 $ 6,589 Loans collectively evaluated for impairment 452,203 570,511 20,859 19,151 211,296 240 33,823 1,308,083 Total gross loans $ 457,254 $ 571,690 $ 21,012 $ 19,151 $ 211,476 $ 240 $ 33,849 $ 1,314,672 A summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class as of December 31, 2017 follows: One- to Four-Family Multi- Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Allowance related to loans individually evaluated for impairment $ 77 $ - $ 44 $ - $ 34 $ - $ - $ 155 Allowance related to loans collectively evaluated for impairment 5,717 4,431 312 949 1,847 10 656 13,922 Balance at end of period $ 5,794 $ 4,431 $ 356 $ 949 $ 1,881 $ 10 $ 656 $ 14,077 Loans individually evaluated for impairment $ 7,418 $ 1,007 $ 185 $ - $ 540 $ - $ 26 $ 9,176 Loans collectively evaluated for impairment 432,179 577,433 20,939 19,859 195,302 255 36,671 1,282,638 Total gross loans $ 439,597 $ 578,440 $ 21,124 $ 19,859 $ 195,842 $ 255 $ 36,697 $ 1,291,814 The following table presents information relating to the Company's internal risk ratings of its loans receivable as of March 31, 2018 and December 31, 2017: One to Four- Family Multi-Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) At March 31, 2018 Substandard $ 7,953 $ 1,179 $ 153 $ - $ 1,047 $ - $ 1,573 $ 11,905 Watch 4,774 329 472 - 288 - 719 6,582 Pass 444,527 570,182 20,387 19,151 210,141 240 31,557 1,296,185 $ 457,254 $ 571,690 $ 21,012 $ 19,151 $ 211,476 $ 240 $ 33,849 $ 1,314,672 At December 31, 2017 Substandard $ 7,581 $ 1,135 $ 138 $ - $ 1,124 $ - $ 1,585 $ 11,563 Watch 4,939 330 401 - 295 - 741 6,706 Pass 427,077 576,975 20,585 19,859 194,423 255 34,371 1,273,545 $ 439,597 $ 578,440 $ 21,124 $ 19,859 $ 195,842 $ 255 $ 36,697 $ 1,291,814 Factors that are important to managing overall credit quality include sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, an allowance for loan losses, and sound non-accrual and charge-off policies. Our underwriting policies require an officers' loan committee review and approval of all loans in excess of $500,000. A member of the credit department, independent of the loan originator, performs a loan review for all loans. Our ability to manage credit risk depends in large part on our ability to properly identify and manage problem loans. To do so, we maintain a loan review system under which our credit management personnel review non-owner occupied one- to four-family, multi-family, construction and land, commercial real estate and commercial loans that individually, or as part of an overall borrower relationship exceed $1.0 million in potential exposure. Loans meeting these criteria are reviewed on an annual basis, or more frequently, if the loan renewal is less than one year. With respect to this review process, management has determined that pass loans include loans that exhibit acceptable financial statements, cash flow and leverage. Watch loans have potential weaknesses that deserve management's attention, and if left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Substandard loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness that may jeopardize liquidation of the debt and are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. Finally, a loan is considered to be impaired when it is probable that the Bank will not be able to collect all amounts due according to the contractual terms of the loan agreement. Management has determined that all non-accrual loans and loans modified under troubled debt restructurings meet the definition of an impaired loan. The Company's procedures dictate that an updated valuation must be obtained with respect to underlying collateral at the time a loan is deemed impaired. Updated valuations may also be obtained upon transfer from loans receivable to real estate owned based upon the age of the prior appraisal, changes in market conditions or known changes to the physical condition of the property. Estimated fair values are reduced to account for sales commissions, broker fees, unpaid property taxes and additional selling expenses to arrive at an estimated net realizable value. The adjustment factor is based upon the Company's actual experience with respect to sales of real estate owned over the prior two years. In situations in which we are placing reliance on an appraisal that is more than one year old, an additional adjustment factor is applied to account for downward market pressure since the date of appraisal. The additional adjustment factor is based upon relevant sales data available for our general operating market as well as company-specific historical net realizable values as compared to the most recent appraisal prior to disposition. With respect to multi-family income-producing real estate, appraisals are reviewed and estimated collateral values are adjusted by updating significant appraisal assumptions to reflect current real estate market conditions. Significant assumptions reviewed and updated include the capitalization rate, rental income and operating expenses. These adjusted assumptions are based upon recent appraisals received on similar properties as well as on actual experience related to real estate owned and currently under Company management. The following tables present data on impaired loans at March 31, 2018 and December 31, 2017. As of or for the Three Months Ended March 31, 2018 Recorded Investment Unpaid Principal Reserve Cumulative Charge-Offs Average Recorded Investment Interest Paid (In Thousands) Total Impaired with Reserve One- to four-family $ 736 $ 736 $ 84 $ - $ 738 $ 9 Multi-family - - - - - - Home equity 97 97 55 - 98 2 Construction and land - - - - - - Commercial real estate 30 439 30 409 32 - Consumer - - - - - - Commercial - - - - - - 863 1,272 169 409 868 11 Total Impaired with no Reserve One- to four-family 4,315 4,780 - 465 4,364 64 Multi-family 1,179 2,039 - 860 1,190 21 Home equity 56 56 - - 57 1 Construction and land - - - - - - Commercial real estate 150 150 - - 150 - Consumer - - - - - - Commercial 26 26 - - 26 - 5,726 7,051 - 1,325 5,787 86 Total Impaired One- to four-family 5,051 5,516 84 465 5,102 73 Multi-family 1,179 2,039 - 860 1,190 21 Home equity 153 153 55 - 155 3 Construction and land - - - - - - Commercial real estate 180 589 30 409 182 - Consumer - - - - - - Commercial 26 26 - - 26 - $ 6,589 $ 8,323 $ 169 $ 1,734 $ 6,655 $ 97 As of or for the Year Ended December 31, 2017 Recorded Investment Unpaid Principal Reserve Cumulative Charge-Offs Average Recorded Investment Interest Paid (In Thousands) Total Impaired with Reserve One- to four-family $ 903 $ 903 $ 77 $ - $ 913 $ 52 Multi-family - - - - - - Home equity 79 79 44 - 83 6 Construction and land - - - - - - Commercial real estate 34 443 34 409 43 - Consumer - - - - - - Commercial - - - - - - 1,016 1,425 155 409 1,039 58 Total Impaired with no Reserve One- to four-family 6,515 7,604 - 1,089 6,796 359 Multi-family 1,007 1,864 - 857 1,005 94 Home equity 106 106 - - 111 5 Construction and land - - - - - - Commercial real estate 506 506 - - 513 19 Consumer - - - - - - Commercial 26 26 - - 26 - 8,160 10,106 - 1,946 8,451 477 Total Impaired One- to four-family 7,418 8,507 77 1,089 7,709 411 Multi-family 1,007 1,864 - 857 1,005 94 Home equity 185 185 44 - 194 11 Construction and land - - - - - - Commercial real estate 540 949 34 409 556 19 Consumer - - - - - - Commercial 26 26 - - 26 - $ 9,176 $ 11,531 $ 155 $ 2,355 $ 9,490 $ 535 The difference between a loan's recorded investment and the unpaid principal balance represents a partial charge-off resulting from a confirmed loss when the value of the collateral securing the loan is below the loan balance and management's assessment that the full collection of the loan balance is not likely. When a loan is considered impaired, interest payments received are treated as interest income on a cash basis as long as the remaining book value of the loan (i.e., after charge-off of all identified losses) is deemed to be fully collectible. If the remaining book value is not deemed to be fully collectible, all payments received are applied to unpaid principal. Determination as to the ultimate collectability of the remaining book value is supported by an updated credit department evaluation of the borrower's financial condition and prospects for repayment, including consideration of the borrower's sustained historical repayment performance and other relevant factors. The determination as to whether an allowance is required with respect to impaired loans is based upon an analysis of the value of the underlying collateral and/or the borrower's intent and ability to make all principal and interest payments in accordance with contractual terms. The evaluation process is subject to the use of significant estimates and actual results could differ from estimates. This analysis is primarily based upon third party appraisals and/or a discounted cash flow analysis. In those cases in which no allowance has been provided for an impaired loan, the Company has determined that the estimated value of the underlying collateral exceeds the remaining outstanding balance of the loan. Of the total $5.7 million of impaired loans as of March 31, 2018 for which no allowance has been provided, $1.3 million in net charge-offs have been recorded to reduce the unpaid principal balance to an amount that is commensurate with the loans' net realizable value, using the estimated fair value of the underlying collateral. To the extent that further deterioration in property values continues, the Company may have to reevaluate the sufficiency of the collateral servicing these impaired loans resulting in additional provisions to the allowance for loans losses or charge-offs. At March 31, 2018, total impaired loans included $5.0 million of troubled debt restructurings. Troubled debt restructurings involve granting concessions to a borrower experiencing financial difficulty by modifying the terms of the loan in an effort to avoid foreclosure. The vast majority of debt restructurings include a modification of terms to allow for an interest only payment and/or reduction in interest rate. The restructured terms are typically in place for six to twelve months. At December 31, 2017, total impaired loans included $5.1 million of troubled debt restructurings. The following presents data on troubled debt restructurings: As of March 31, 2018 Accruing Non-accruing Total Amount Number Amount Number Amount Number (Dollars in Thousands) One- to four-family $ 2,740 2 $ 1,111 7 $ 3,851 9 Multi-family - - 793 3 793 3 Commercial real estate 288 1 30 1 318 2 $ 3,028 3 $ 1,934 11 $ 4,962 14 As of December 31, 2017 Accruing Non-accruing Total Amount Number Amount Number Amount Number (Dollars in Thousands) One- to four-family $ 2,740 2 $ 1,156 7 $ 3,896 9 Multi-family - - 815 3 815 3 Home equity 47 1 - - 47 1 Commercial real estate 290 1 34 1 324 2 $ 3,077 4 $ 2,005 11 $ 5,082 15 At March 31, 2018, $5.0 million in loans had been modified in troubled debt restructurings and $1.9 million of these loans were included in the non-accrual loan total. The remaining $3.0 million, while meeting the internal requirements for modification in a troubled debt restructuring, were current with respect to payments under their original loan terms at the time of the restructuring and, therefore, continued to be included with accruing loans. Provided these loans perform in accordance with the modified terms, they will continue to be accounted for on an accrual basis. All loans that have been modified in a troubled debt restructuring are considered to be impaired. As such, an analysis has been performed with respect to all of these loans to determine the need for a valuation reserve. When a loan is expected to perform in accordance with the restructured terms and ultimately return to and perform under contract terms, a valuation allowance is established for an amount equal to the excess of the present value of the expected future cash flows under the original contract terms as compared with the modified terms, including an estimated default rate. When there is doubt as to the borrower's ability to perform under the restructured terms or ultimately return to and perform under market terms, a valuation allowance is established equal to the impairment when the carrying amount exceeds fair value of the underlying collateral. As a result of the impairment analysis, a $30,000 valuation allowance has been established as of March 31, 2018 with respect to the $5.0 million in troubled debt restructurings. As of December 31, 2017, a $34,000 valuation allowance had been established with respect to the $5.1 million in troubled debt restructurings. After a troubled debt restructuring reverts to market terms, a minimum of six consecutive contractual payments must be received prior to consideration for a return to accrual status. If an updated credit department review indicates no other evidence of elevated credit risk, the loan is returned to accrual status at that time. The following presents troubled debt restructurings by concession type: As of March 31, 2018 Performing in accordance with modified terms In Default Total Amount Number Amount Number Amount Number (Dollars in Thousands) Interest reduction and principal forbearance $ 4,583 10 $ 30 1 $ 4,613 11 Principal forbearance - - - - - - Interest reduction 349 3 - - 349 3 $ 4,932 13 $ 30 1 $ 4,962 14 As of December 31, 2017 Performing in accordance with modified terms In Default Total Amount Number Amount Number Amount Number (Dollars in Thousands) Interest reduction and principal forbearance $ 4,022 9 $ 660 2 $ 4,682 11 Principal forbearance 47 1 - - 47 1 Interest reduction 353 3 - - 353 3 $ 4,422 13 $ 660 2 $ 5,082 15 There were no loans modified as troubled debt restructurings during the three months ended March 31, 2018 and March 31, 2017. There were no troubled debt restructurings within the past twelve months for which there was a default during the three months ended March 31, 2018 and March 31, 2017. The following table presents data on non-accrual loans as of March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 (Dollars in Thousands) Non-accrual loans: Residential One- to four-family $ 5,051 $ 4,677 Multi-family 1,178 1,007 Home equity 122 107 Construction and land - - Commercial real estate 180 251 Commercial 26 26 Consumer - - Total non-accrual loans $ 6,557 $ 6,068 Total non-accrual loans to total loans receivable 0.50 % 0.47 % Total non-accrual loans to total assets 0.36 % 0.34 %

Real Estate Owned

Real Estate Owned	3 Months Ended
	Mar. 31, 2018
Real Estate Owned [Abstract]
Real Estate Owned [Text Block]	Note 4— Real Estate Owned Real estate owned is summarized as follows: March 31, 2018 December 31, 2017 (In Thousands) One- to four-family $ 1,062 $ 1,330 Multi-family - - Construction and land 3,663 4,582 Commercial real estate 300 300 Total real estate owned 5,025 6,212 Valuation allowance at end of period (1,651 ) (1,654 ) Total real estate owned, net $ 3,374 $ 4,558 The following table presents the activity in the Company's real estate owned: Three months ended March 31, 2018 2017 (In Thousands) Real estate owned at beginning of the period $ 4,558 6,118 Transferred from loans receivable 238 416 Sales (net of gains / losses) (1,165 ) (1,009 ) Write downs (257 ) (455 ) Other - - Real estate owned at the end of the period $ 3,374 5,070 Residential one- to four-family mortgage loans that were in the process of foreclosure were $2.1 million and $2.3 million at March 31, 2018 and December 31, 2017, respectively.

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2018
Mortgage Servicing Rights [Abstract]
Mortgage Servicing Rights	Note 5— Mortgage Servicing Rights The following table presents the activity in the Company's mortgage servicing rights: Three months ended March 31, 2018 2017 (In Thousands) Mortgage servicing rights at beginning of the period $ 888 $ 2,260 Additions 100 314 Amortization (49 ) (19 ) Sales - (2,264 ) Mortgage servicing rights at end of the period 939 291 Valuation allowance at end of period - - Mortgage servicing rights at end of the period, net $ 939 $ 291 During the three months ended March 31, 2018, $489.2 million in residential loans were originated for sale on a consolidated basis. During the same period, sales of loans held for sale totaled $532.1 million, generating mortgage banking income of $24.2 million. The unpaid principal balance of loans serviced for others was $134.3 million and $126.3 million at March 31, 2018 and December 31, 2017, respectively. These loans are not reflected in the consolidated statements of financial condition. During the three months ended March 31, 2018, the Company did not sell any mortgage servicing rights. During the three months ended March 31, 2017, the Company sold mortgage servicing rights related to $295.1 million in loans receivable with a book value of $2.3 million for $2.6 million resulting in a gain on sale of $308,000. The following table shows the estimated future amortization expense for mortgage servicing rights for the periods indicated: Estimate for the period ending December 31: (In Thousands) 2018 $ 102 2019 120 2020 111 2021 101 2022 92 Thereafter 413 Total $ 939

Deposits

Deposits	3 Months Ended
	Mar. 31, 2018
Deposits [Abstract]
Deposits	Note 6— Deposits At March 31, 2018 and December 31, 2017, time deposits with balances greater than $250,000 amounted to $51.3 million and $45.9 million, respectively. A summary of the contractual maturities of time deposits at March 31, 2018 is as follows: (In Thousands) Within one year $ 522,568 More than one to two years 155,048 More than two to three years 15,534 More than three to four years 1,129 More than four through five years 2,919 $ 697,198

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2018
Borrowings [Abstract]
Borrowings	Note 7— Borrowings Borrowings consist of the following: March 31, 2018 December 31, 2017 Balance Weighted Average Rate Balance Weighted Average Rate (Dollars in Thousands) Short term: Repurchase agreement $ 19,365 4.63 % $ 11,285 4.32 % Federal Home Loan Bank, Chicago advances 10,000 1.80 % 35,000 1.28 % Long term: Federal Home Loan Bank, Chicago advances maturing: 2018 50,000 3.04 % 65,000 2.97 % 2021 100,000 0.78 % 100,000 0.78 % 2027 175,000 1.38 % 175,000 1.38 % 2028 80,000 2.24 % - - $ $ 434,365 1.61 % $ $ 386,285 1.57 % The short-term repurchase agreement represents the outstanding portion of a total $35.0 million commitment with one unrelated bank. The short-term repurchase agreement is utilized by Waterstone Mortgage Corporation to finance loans originated for sale. This agreement is secured by the underlying loans being financed. Related interest rates are based upon the note rate associated with the loans being financed. The short-term repurchase agreement had a $19.4 million balance at March 31, 2018 and an $11.3 million balance at December 31, 2017. The $10.0 million short-term advance has a fixed rate of 1.80% and a maturity date of April 23, 2018. The $50.0 million in advances due in 2018 consists of two advances with fixed rates ranging from 2.97% to 3.11% callable quarterly until maturity. The $100.0 million in advances due in 2021 consists of two advances totaling $50.0 million with fixed rates ranging from 0.67% to 0.73% with a FHLB quarterly call option beginning in June 2018 and one advance for $50.0 million with a fixed rate of 0.85% with a FHLB quarterly call option beginning in September 2018. The $175.0 million in advances due in 2027 consists of one $50.0 million advance with a fixed rate of 1.24% with a FHLB single call option in May 2019, one $50.0 million advance with a fixed rate of 1.23% with a FHLB single call option in June 2019, one $25.0 million advance with a fixed rate of 1.23% with a FHLB single call option in August 2019, and one $50.0 million advance with a fixed rate of 1.73% with a FHLB single call option in December 2019. The $80.0 million in advances due in 2028 consists of one $25.0 million advance with a fixed rate of 2.16% with a FHLB single call option in March 2020 and two advances totaling $55.0 million with a fixed rate of 2.27% and with a FHLB single call option in March 2021. The Company selects loans that meet underwriting criteria established by the FHLBC as collateral for outstanding advances. The Company's borrowings from the FHLBC are limited to 77% of the carrying value of unencumbered one- to four-family mortgage loans, 64% of the carrying value of home equity loans and 75% of the carrying value of multi-family loans. In addition, these advances were collateralized by FHLBC stock of $18.7 million at March 31, 2018 and $16.9 million at December 31, 2017. In the event of prepayment, the Company is obligated to pay all remaining contractual interest on the advance.

Regulatory Capital

Regulatory Capital	3 Months Ended
	Mar. 31, 2018
Regulatory Capital [Abstract]
Regulatory Capital	Note 8 – 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, or overall financial performance deemed by the regulators to be inadequate, can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Company's and Bank's assets, liabilities, and certain off-balance-sheet items, as calculated under regulatory accounting practices. The Company's and Bank's capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. The Federal Reserve Board and the Federal Deposit Insurance Corporation ("FDIC") issued final rules implementing the Basel III regulatory capital framework and related Dodd-Frank Wall Street Reform and Consumer Protection Act changes. The rules revise minimum capital requirements and adjust prompt corrective action thresholds. The final rules revise the regulatory capital elements, add a new common equity Tier I capital ratio, increase the minimum Tier 1 capital ratio requirements and implement a new capital conservation buffer. The rules also permit certain banking organizations to retain, through a one-time election, the existing treatment for accumulated other comprehensive income. The Company and the Bank have made the election to retain the existing treatment for accumulated other comprehensive income. The final rules took effect for the Company and the Bank on January 1, 2015, subject to a transition period for certain parts of the rules. The table below includes the regulatory capital ratio requirements that became effective on January 1, 2015. Beginning in 2016, an additional capital conservation buffer was added to the minimum requirements for capital adequacy purposes, subject to a three year phase-in period. The capital conservation buffer will be fully phased-in on January 1, 2019 at 2.5%. A banking organization with a conservation buffer of less than 2.5% (or the required phase-in amount in years prior to 2019) will be subject to limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers. At March 31, 2018, the ratios for the Company and the Bank are sufficient to meet the fully phased-in conservation buffer. The actual and required capital amounts and ratios for the Bank as of March 31, 2018 and December 31, 2017 are presented in the table below: March 31, 2018 Actual For Capital Adequacy Purposes Minimum Capital Adequacy with Capital Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars In Thousands) Total Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. $ 412,639 29.96 % $ 110,202 8.00 % $ 136,030 9.875 % $ N/A N/A WaterStone Bank 383,288 27.85 % 110,096 8.00 % 135,899 9.875 % 137,619 10.00 % Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 399,449 29.00 % 82,651 6.00 % 108,480 7.875 % N/A N/A WaterStone Bank 370,098 26.89 % 82,572 6.00 % 108,375 7.875 % 110,096 8.00 % Common Equity Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 399,449 29.00 % 61,988 4.50 % 87,817 6.375 % N/A N/A WaterStone Bank 370,098 26.89 % 61,929 4.50 % 87,732 6.375 % 89,453 6.50 % Tier 1 Capital (to average assets) Consolidated Waterstone Financial, Inc. 399,449 22.31 % 71,612 4.00 % N/A N/A N/A N/A WaterStone Bank 370,098 20.67 % 71,612 4.00 % N/A N/A 89,516 5.00 % State of Wisconsin (to total assets) WaterStone Bank 370,098 20.17 % 110,101 6.00 % N/A N/A N/A N/A December 31, 2017 (Dollars In Thousands) Total Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. $ 426,057 30.75 % $ 110,829 8.00 % $ 128,146 9.25 % $ N/A N/A WaterStone Bank 400,792 28.93 % 110,812 8.00 % 128,127 9.25 % 138,515 10.00 % Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 411,980 29.74 % 83,122 6.00 % 100,439 7.25 % N/A N/A WaterStone Bank 386,715 27.92 % 83,109 6.00 % 100,424 7.25 % 110,812 8.00 % Common Equity Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 411,980 29.74 % 62,341 4.50 % 79,658 5.75 % N/A N/A WaterStone Bank 386,715 27.92 % 62,332 4.50 % 79,646 5.75 % 90,035 6.50 % Tier 1 Capital (to average assets) Consolidated Waterstone Financial, Inc. 411,980 22.43 % 73,481 4.00 % N/A N/A N/A N/A WaterStone Bank 386,715 21.10 % 73,304 4.00 % N/A N/A 91,630 5.00 % State of Wisconsin (to total assets) WaterStone Bank 386,715 21.44 % 108,243 6.00 % N/A N/A N/A N/A

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Taxes [Abstract]
Income Taxes	Note 9 – Income Taxes Income tax expense decreased $1.3 million, or 38.4%, to $2.1 million for the three months ended March 31, 2018 compared to $3.4 million during the three months ended March 31, 2017. Income tax expense was recognized on the statement of income during the three months ended March 31, 2018 at an effective rate of 23.2% of pretax income compared to 34.2% during the three months ended March 31, 2017. The decrease in the effective rate primarily resulted from the federal tax rate decrease from 35% to 21% as a result of The Tax Cuts and Jobs Act that was enacted into law on December 22, 2017. During the three months ended March 31, 2018, the Company recognized a benefit of approximately $130,000 related to stock awards exercised compared to a benefit of $350,000 recognized during the three months ended March 31, 2017.

Offsetting of Assets and Liabil

Offsetting of Assets and Liabilities	3 Months Ended
	Mar. 31, 2018
Offsetting of Assets and Liabilities [Abstract]
Offsetting of Assets and Liabilities	Note 10 – Offsetting of Assets and Liabilities The Company enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. In addition, the Company enters into agreements under which it sells loans held for sale subject to an obligation to repurchase the same loans. Under these arrangements, the Company may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Company to repurchase the assets. As a result, these repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of assets. The obligation to repurchase the assets is reflected as a liability in the Company's consolidated statements of financial condition, while the securities and loans held for sale underlying the repurchase agreements remain in the respective investment securities and loans held for sale asset accounts. In other words, there is no offsetting or netting of the investment securities or loans held for sale assets with the repurchase agreement liabilities. One of the Company's two short-term repurchase agreements and all of the Company's long-term repurchase agreements are subject to master netting agreements, which set forth the rights and obligations for repurchase and offset. Under the master netting agreement, the Company is entitled to set off the collateral placed with a single counterparty against obligations owed to that counterparty. The following table presents the liabilities subject to an enforceable master netting agreement as of March 31, 2018 and December 31, 2017. Gross Recognized Liabilities Gross Amounts Offset Net Amounts Presented Gross Amounts Not Offset Net Amount (In Thousands) March 31, 2018 Repurchase Agreements Short-term $ 19,365 $ - $ 19,365 $ 19,365 $ - Long-term - - - - - $ 19,365 $ - $ 19,365 $ 19,365 $ - December 31, 2017 Repurchase Agreements Short-term $ 11,285 $ - $ 11,285 $ 11,285 $ - Long-term - - - - - $ 11,285 $ - $ 11,285 $ 11,285 $ -

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities [Abstract]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	Note 11– Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities The Company is a 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 and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated statements of financial condition. The contract or notional amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. March 31, 2018 December 31, 2017 (In Thousands) Financial instruments whose contract amounts represent potential credit risk: Commitments to extend credit under amortizing loans (1) $ 53,445 $ 31,543 Commitments to extend credit under home equity lines of credit (2) 15,080 14,972 Unused portion of construction loans (3) 24,194 17,097 Unused portion of business lines of credit 16,078 16,878 Standby letters of credit 267 259 (1) (2) (3) 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. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements of the Company. 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 counter-party. Collateral obtained generally consists of mortgages on the underlying real estate. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company holds mortgages on the underlying real estate as collateral supporting those commitments for which collateral is deemed necessary. The Company has determined that there are no probable losses related to commitments to extend credit or the standby letters of credit as of March 31, 2018 and December 31, 2017. In the normal course of business, the Company, or it's subsidiaries, are involved in various legal proceedings. In the opinion of management, any liability resulting from pending proceedings would not be expected to have a material adverse effect on the Company's consolidated financial statements. Herrington v. Waterstone Mortgage Corporation Waterstone Mortgage Corporation is a defendant in a class action lawsuit that was filed in the United States District Court for the Western District of Wisconsin and subsequently compelled to arbitration before the American Arbitration Association. The plaintiff class alleged that Waterstone Mortgage Corporation violated certain provisions of the Fair Labor Standards Act (FLSA) and failed to pay loan officers consistent with their employment agreements. On July 5, 2017, the arbitrator issued a Final Award finding Waterstone Mortgage Corporation liable for unpaid minimum wages, overtime, unreimbursed business expenses, and liquidated damages under the FLSA. On December 8, 2017, the District Court confirmed the award in large part, and entered a judgment against Waterstone in the amount of $7,267,919 in damages to Claimants, $3,298,851 in attorney fees and costs, and a $20,000 incentive fee to Plaintiff Herrington, plus post-judgment interest. On February 12, 2018, the District Court awarded post-arbitration fees and costs of approximately $98,000. The judgment is currently being appealed to the Seventh Circuit Court of Appeals, and execution of the judgment is stayed pending appeal. If the judgment is upheld, the Company has estimated that the award, which includes attorney's fees, costs, and interest, could be as high as $11.0 million. Waterstone Mortgage Corporation will continue to vigorously defend its interests in this matter, including pursuing appropriate appellate processes to challenge the judgment. Although the Company believes there is a basis for appeal, there remains a reasonable possibility that the Court's judgment will be affirmed in whole or in part, with the possible range of loss from $0 to $11.0 million. Given the pending appeal, we do not believe that the loss is probable at this time, as that term is used in assessing loss contingencies. Accordingly, in accordance with the authoritative guidance in the evaluation of contingencies, the Company has not recorded an accrual related to this matter. Werner v. Waterstone Mortgage Corporation Waterstone Mortgage Corporation is a defendant in a putative collection action lawsuit that was filed on August 4, 2017 in the United States District Court for the Western District of Wisconsin, Werner et al. v. Waterstone Mortgage Corporation. Plaintiffs allege that Waterstone Mortgage Corporation violated the FLSA by failing to pay loan officers minimum and overtime wages. The case in the early stages of litigation. On October 26, 2017, Plaintiffs moved for conditional certification and to provide notice to the putative class. On February 9, 2018, the Court denied Plaintiffs' motion for conditional certification and notice. The Company intends to continue to vigorously defend its interests in this matter and pursue all possible defenses against the claims. Given the early stage of the litigation, the Company is not yet able to make a determination as to the likelihood of an unfavorable outcome in this matter, nor is it able to estimate the range of any possible loss.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	Note 12 – Derivative Financial Instruments In connection with its mortgage banking activities, the Company enters into derivative financial instruments as part of its strategy to manage its exposure to changes in interest rates. Mortgage banking derivatives include interest rate lock commitments provided to customers to fund mortgage loans to be sold in the secondary market and forward commitments for the future delivery of such loans to third party investors. It is the Company's practice to enter into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held for sale. The Company's mortgage banking derivatives have not been designated as hedge relationships. These instruments are used to manage the Company's exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of ASC 815. Changes in the fair value of derivatives not designated in hedging relationships are recorded as a component of mortgage banking income in the Company's consolidated statements of operations. The Company does not use derivatives for speculative purposes. Forward commitments to sell mortgage loans represent commitments obtained by the Company from a secondary market agency to purchase mortgages from the Company at specified interest rates and within specified periods of time. Commitments to sell loans are made to mitigate interest rate risk on interest rate lock commitments to originate loans and loans held for sale. At March 31, 2018, the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $377.0 million and interest rate lock commitments with an aggregate notional amount of approximately $296.4 million. The fair value of the forward commitments to sell mortgage loans at March 31, 2018 included a loss of $318,000 that is reported as a component of other liabilities on the Company's consolidated statement of financial condition. The fair value of the interest rate locks at March 31, 2018 included a gain of $3.3 million that is reported as a component of other assets on the Company's consolidated statements of financial condition. In determining the fair value of its derivative loan commitments, the Company considers the value that would be generated by the loan arising from exercise of the loan commitment when sold in the secondary mortgage market. That value includes the price that the loan is expected to be sold for in the secondary mortgage market. The fair value of these commitments is recorded on the consolidated statements of financial condition with the changes in fair value recorded as a component of mortgage banking income. The significant unobservable input used in the fair value measurement of the Company's mortgage banking derivatives, including interest rate lock commitments, is the loan pull through rate. This represents the percentage of loans currently in a lock position which the Company estimates will ultimately close. Generally, the fair value of an interest rate lock commitment will be positively (negatively) impacted when the prevailing interest rate is lower (higher) than the interest rate lock commitment. Generally, an increase in the pull through rate will result in the fair value of the interest rate lock increasing when in a gain position, or decreasing when in a loss position. The pull through rate is largely dependent on the loan processing stage that a loan is currently in and the change in prevailing interest rates from the time of the rate lock. The pull through rate is computed using historical data and the ratio is periodically reviewed by the Company. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages. The Company's agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold related to credit information, loan documentation and collateral, which if subsequently are untrue or breached, could require the Company to repurchase certain loans affected. The Company has only been required to make insignificant repurchases as a result of breaches of these representations and warranties. The Company's agreements to sell residential mortgage loans also contain limited recourse provisions. The recourse provisions are limited in that the recourse provision ends after certain payment criteria have been met. With respect to these loans, repurchase could be required if defined delinquency issues arose during the limited recourse period. Given that the underlying loans delivered to buyers are predominantly conventional first lien mortgages and that historical experience shows negligible losses and insignificant repurchase activity, management believes that losses and repurchases under the limited recourse provisions will continue to be insignificant.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings (loss) per share	Note 13 – Earnings Per Share Earnings per share are computed using the two-class method. Basic earnings per share is computed by dividing net income allocated to common shares by the weighted average number of common shares outstanding during the applicable period. Diluted earnings per share is computed by dividing net income by the weighted average number of common shares outstanding adjusted for the dilutive effect of all potential common shares. Presented below are the calculations for basic and diluted earnings per share: Three months ended March 31, 2018 2017 Net income $ 6,953 6,572 Weighted average shares outstanding 27,509 27,323 Effect of dilutive potential common shares $ 293 544 Diluted weighted average shares outstanding $ 27,802 27,867 Basic earnings per share $ 0.25 0.24 Diluted earnings per share $ 0.25 0.24

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	Note 14 – Fair Value Measurements ASC Topic 820, "Fair Value Measurements and Disclosures" defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. This accounting standard applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements. The standard also emphasizes that fair value (i.e., the price that would be received in an orderly transaction that is not a forced liquidation or distressed sale at the measurement date), among other things, is based on exit price versus entry price, should include assumptions about risk such as nonperformance risk in liability fair values, and is a market-based measurement, not an entity-specific measurement. When considering the assumptions that market participants would use in pricing the asset or liability, this accounting standard establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy prioritizes inputs used to measure fair value into three broad levels. Level 1 inputs Level 2 inputs Level 3 inputs In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. The following table presents information about our assets recorded in our consolidated statement of financial condition at their fair value on a recurring basis as of March 31, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. Fair Value Measurements Using March 31, 2018 Level 1 Level 2 Level 3 (In Thousands) Available for sale securities Mortgage-backed securities $ 52,583 $ - $ 52,583 $ - Collateralized mortgage obligations Government sponsored enterprise issued 56,670 - 56,670 - Government sponsored enterprise bonds 498 - 498 - Municipal securities 62,783 - 62,783 - Other debt securities 13,714 - 13,714 - Certificates of deposit 735 - 735 - Loans held for sale 127,638 - 127,638 - Mortgage banking derivative assets 3,299 - - 3,299 Mortgage banking derivative liabilities 318 - - 318 Fair Value Measurements Using December 31, 2017 Level 1 Level 2 Level 3 (In Thousands) Available for sale securities Mortgage-backed securities $ 57,435 $ - $ 57,435 $ - Collateralized mortgage obligations Government sponsored enterprise issued 60,500 - 60,500 - Government sponsored enterprise bonds 2,497 - 2,497 - Municipal securities 63,769 - 63,769 - Other debt securities 14,525 - 14,525 - Certificates of deposit 981 - 981 - Loans held for sale 149,896 - 149,896 - Mortgage banking derivative assets 2,004 - - 2,004 Mortgage banking derivative liabilities - - - - The following summarizes the valuation techniques for assets recorded in our consolidated statements of financial condition at their fair value on a recurring basis: Available for sale securities – The Company's investment securities classified as available for sale include: mortgage-backed securities, collateralized mortgage obligations, government sponsored enterprise bonds, municipal securities and other debt securities. The fair value of mortgage-backed securities, collateralized mortgage obligations and government sponsored enterprise bonds are determined by a third party valuation source using observable market data utilizing a matrix or multi-dimensional relational pricing model. Standard inputs to these models include observable market data such as benchmark yields, reported trades, broker quotes, issuer spreads, benchmark securities, prepayment models and bid/offer market data. For securities with an early redemption feature, an option adjusted spread model is utilized to adjust the issuer spread. These model and matrix measurements are classified as Level 2 in the fair value hierarchy. The fair value of municipal securities is determined by a third party valuation source using observable market data utilizing a multi-dimensional relational pricing model. Standard inputs to this model include observable market data such as benchmark yields, reported trades, broker quotes, rating updates and issuer spreads. These model measurements are classified as Level 2 in the fair value hierarchy. The change in fair value is recorded through an adjustment to the statement of comprehensive income. Loans held for sale – The Company carries loans held for sale at fair value under the fair value option model. Fair value is generally determined by estimating a gross premium or discount, which is derived from pricing currently observable in the secondary market, principally from observable prices for forward sale commitments. Loans held-for-sale are considered to be Level 2 in the fair value hierarchy of valuation techniques. The change in fair value is recorded through an adjustment to the statement of operations. Mortgage banking derivatives - Mortgage banking derivatives include interest rate lock commitments to originate residential loans held for sale to individual customers and forward commitments to sell residential mortgage loans to various investors. The Company utilizes a valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes applying a pull through rate based upon historical experience and the current interest rate environment and then multiplying by quoted investor prices. The Company also utilizes a valuation model to estimate the fair value of its forward commitments to sell residential loans, which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. While there are Level 2 and 3 inputs used in the valuation models, the Company has determined that one or more of the inputs significant in the valuation of both of the mortgage banking derivatives fall within Level 3 of the fair value hierarchy. The change in fair value is recorded through an adjustment to the statement of operations. The table below presents reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during 2018 and 2017. Mortgage banking derivatives, net (In Thousands) Balance at December 31, 2016 $ 3,334 Mortgage derivative gain, net (1,330 ) Balance at December 31, 2017 $ 2,004 Mortgage derivative loss, net 977 Balance at March 31, 2018 $ 2,981 There were no transfers in or out of Level 1, 2 or 3 measurements during the periods. Assets Recorded at Fair Value on a Non-recurring Basis The following tables present information about our assets recorded in our consolidated statement of financial condition at their fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. Fair Value Measurements Using March 31, 2018 Level 1 Level 2 Level 3 (In Thousands) Impaired loans, net (1) $ 694 $ - $ - $ 694 Real estate owned 3,374 - - 3,374 Mortgage servicing rights 1,350 - - 1,350 Fair Value Measurements Using December 31, 2017 Level 1 Level 2 Level 3 (In Thousands) Impaired loans, net (1) $ 861 $ - $ - $ 861 Real estate owned 4,558 - - 4,558 Mortgage servicing rights 1,125 - - 1,125 (1) Represents collateral-dependent impaired loans, net, which are included in loans. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. Fair value information about financial instruments follows, whether or not recognized in the consolidated statements of financial condition, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instrument. Certain financial instruments and all nonfinancial instruments are excluded from its disclosure requirements. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company. The carrying amounts and fair values of the Company's financial instruments consist of the following: March 31, 2018 December 31, 2017 Carrying amount Fair Value Carrying amount Fair Value Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 (In Thousands) Financial Assets Cash and cash equivalents $ 83,407 $ 83,407 $ 80,407 $ 3,000 $ - $ 48,607 $ 48,607 $ 39,607 $ 9,000 $ - Securities available-for-sale 186,983 186,983 - 186,983 - 199,707 199,707 - 199,707 - Loans held for sale 127,638 127,638 - 127,638 - 149,896 149,896 - 149,896 - Loans receivable 1,314,672 1,287,014 - - 1,287,014 1,291,814 1,291,142 - - 1,291,142 FHLB stock 18,675 18,675 - 18,675 - 16,875 16,875 - 16,875 - Accrued interest receivable 5,197 5,197 5,197 - - 4,924 4,924 4,924 - - Mortgage servicing rights 939 1,350 - - 1,350 888 1,125 - - 1,125 Mortgage banking derivative assets 3,299 3,299 - - 3,299 2,004 2,004 - - 2,004 Financial Liabilities Deposits 974,224 973,730 277,026 696,704 - 967,380 967,558 278,401 689,157 - Advance payments by borrowers for taxes 12,004 12,004 12,004 - - 4,876 4,876 4,876 - - Borrowings 434,365 431,172 - 431,172 - 386,285 384,348 - 384,348 - Accrued interest payable 904 904 904 - - 886 886 886 - - Mortgage banking derivative liabilities 318 318 - - 318 - - - - - The following methods and assumptions were used by the Company in determining its fair value disclosures for financial instruments. Cash and Cash Equivalents The carrying amount reported in the consolidated statements of financial condition for cash and cash equivalents is a reasonable estimate of fair value. Securities The fair value of securities is generally determined by a third party valuation source using observable market data utilizing a matrix or multi-dimensional relational pricing model. Standard inputs to these models include observable market data such as benchmark yields, reported trades, broker quotes, issuer spreads, benchmark securities and bid/offer market data. For securities with an early redemption feature, an option adjusted spread model is utilized to adjust the issuer spread. Prepayment models are used for mortgage related securities with prepayment features. Loans Held for Sale Fair value is estimated using the prices of the Company's existing commitments to sell such loans and/or the quoted market price for commitments to sell similar loans. Loans Receivable The fair value estimation process for the loan portfolio uses an exit price concept and reflects discounts the Company believes are consistent with discounts in the market place. Fair values are estimated for portfolios of loans with similar characteristics. Loans are segregated by type such as one- to four-family, multi-family, home equity, construction and land, commercial real estate, commercial, and other consumer. The fair value of loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for similar maturities. The fair value analysis also included other assumptions to estimate fair value, intended to approximate those a market participant would use in an orderly transaction, with adjustments for discount rates, interest rates, liquidity, and credit spreads, as appropriate. FHLB Stock For FHLB stock, the carrying amount is the amount at which shares can be redeemed with the FHLB and is a reasonable estimate of fair value. Deposits and Advance Payments by Borrowers for Taxes The fair values for interest-bearing and noninterest-bearing negotiable order of withdrawal accounts, savings accounts, and money market accounts are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). The fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates of similar remaining maturities to a schedule of aggregated expected monthly maturities of the outstanding certificates of deposit. The advance payments by borrowers for taxes are equal to their carrying amounts at the reporting date. Borrowings Fair values for borrowings are estimated using a discounted cash flow calculation that applies current interest rates to estimated future cash flows of the borrowings. Accrued Interest Payable and Accrued Interest Receivable For accrued interest payable and accrued interest receivable, the carrying amount is a reasonable estimate of fair value. Commitments to Extend Credit and Standby Letters of Credit Commitments to extend credit and standby letters of credit are generally not marketable. Furthermore, interest rates on any amounts drawn under such commitments would be generally established at market rates at the time of the draw. Fair values for the Company's commitments to extend credit and standby letters of credit are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, the counterparty's credit standing, and discounted cash flow analyses. The fair value of the Company's commitments to extend credit was not material at March 31, 2018 and December 31, 2017. Mortgage Banking Derivative Assets and Liabilities Mortgage banking derivatives include interest rate lock commitments to originate residential loans held for sale to individual customers and forward commitments to sell residential mortgage loans to various investors. The Company relies on a valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes applying a pull through rate based upon historical experience and the current interest rate environment, and then multiplying by quoted investor prices. The Company also relies on a valuation model to estimate the fair value of its forward commitments to sell residential loans, which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. On the Company's Consolidated Statements of Condition, instruments that have a positive fair value are included in prepaid expenses and other assets, and those instruments that have a negative fair value are included in other liabilities.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segments and Related Information	Note 15 – Segment Reporting Selected financial and descriptive information is required to be provided about reportable operating segments, considering a "management approach" concept as the basis for identifying reportable segments. The management approach is based on the way that management organizes the segments within the enterprise for making operating decisions, allocating resources, and assessing performance. Consequently, the segments are evident from the structure of the enterprise's internal organization, focusing on financial information that an enterprise's chief operating decision-makers use to make decisions about the enterprise's operating matters. The Company has determined that it has two reportable segments: community banking and mortgage banking. The Company's operating segments are presented based on its management structure and management accounting practices. The structure and practices are specific to the Company and therefore, the financial results of the Company's business segments are not necessarily comparable with similar information for other financial institutions. Community Banking The community banking segment provides consumer and business banking products and services to customers primarily within Southeastern Wisconsin along with a loan production office in Minneapolis, Minnesota. Within this segment, the following products and services are provided: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, real estate financing, business loans, and business lines of credit; (2) deposit and transactional solutions such as checking, credit, debit and pre-paid cards, online banking and bill pay, and money transfer services; (3) investable funds solutions such as savings, money market deposit accounts, IRA accounts, certificates of deposit, and (4) fixed and variable annuities, insurance as well as trust and investment management accounts. Consumer products include loan and deposit products: mortgage, home equity loans and lines, personal term loans, demand deposit accounts, interest bearing transaction accounts and time deposits. Consumer products also include personal investment services. Business banking products include secured and unsecured lines and term loans for working capital, inventory and general corporate use, commercial real estate construction loans, demand deposit accounts, interest bearing transaction accounts and time deposits. Mortgage Banking The mortgage banking segment provides residential mortgage loans for the primary purpose of sale on the secondary market. Mortgage banking products and services are provided by offices in 23 states. As of or for the three months ended March 31, 2018 Community Banking Mortgage Banking Holding Company and Other Consolidated (In Thousands) Net interest income $ 13,304 (192 ) 29 13,141 Provision for loan losses (900 ) 20 - (880 ) Net interest income after provision for loan losses 14,204 (212 ) 29 14,021 Noninterest income 939 24,731 (487 ) 25,183 Noninterest expenses: Compensation, payroll taxes, and other employee benefits 4,888 16,241 (146 ) 20,983 Occupancy, office furniture and equipment 826 1,813 - 2,639 FDIC insurance premiums 125 - - 125 Real estate owned 317 - - 317 Other 1,526 4,887 (330 ) 6,083 Total noninterest expenses 7,682 22,941 (476 ) 30,147 Income before income taxes 7,461 1,578 18 9,057 Income tax expense 1,668 435 1 2,104 Net income $ 5,793 1,143 17 6,953 Total assets $ 1,819,569 158,267 (138,572 ) 1,839,264 As of or for the three months ended March 31, 2017 Community Banking Mortgage Banking Holding Company and Other Consolidated (In Thousands) Net interest income $ 11,680 100 115 11,895 Provision for loan losses (1,300 ) 89 - (1,211 ) Net interest income after provision for loan losses 12,980 11 115 13,106 Noninterest income 812 25,385 (260 ) 25,937 Noninterest expenses: Compensation, payroll taxes, and other employee benefits 4,328 15,789 (122 ) 19,995 Occupancy, office furniture and equipment 841 1,686 - 2,527 FDIC insurance premiums 120 - - 120 Real estate owned 411 - - 411 Other 1,257 4,861 (113 ) 6,005 Total noninterest expenses 6,957 22,336 (235 ) 29,058 Income before income taxes 6,835 3,060 90 9,985 Income tax expense 2,159 1,234 20 3,413 Net income $ 4,676 1,826 70 6,572 Total assets $ 1,735,619 154,984 (163,430 ) 1,727,173

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Basis of Presentation [Abstract]
Basis of presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles ("GAAP") for interim financial information, Rule 10-01 of Regulation S-X and the instructions to Form 10-Q. The financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring accruals) necessary to present fairly the financial position, results of operations, changes in shareholders' equity, and cash flows of the Company for the periods presented.
Use of estimates	The preparation of the unaudited consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include the allowance for loan losses, deferred income taxes and real estate owned. Actual results could differ from those estimates. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or shareholders' equity. Impact of Recent Accounting Pronouncements Accounting Standards Codification ("ASC") Topic 606 "Revenue from Contracts with Customers." Authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize 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 and to provide clarification on identifying performance obligations and licensing implementation guidance. The Company's revenue is comprised of interest and non-interest revenue. The majority of our revenue generating transactions are not subject to ASC 606, including revenue generated from financial instruments, such as our loans, letters of credit, investment securities, bank owned life insurance and gains on sales of loans held for sale. The Company completed its overall assessment of revenue streams and related contracts affected by the guidance and adopted ASC 606 on January 1, 2018 with no impact on total shareholders' equity or net income. Revenue Recognition The Company recognizes revenue as it is earned and noted no impact to its revenue recognition policies as a result of the adotpion of ASC 606. The following is a discussion of revenues within the scope of the new revenue guidance: ● Debit and credit card interchange fee income ● Service charges on deposit accounts ● Service charges on loan accounts ASC Topic 825 "Financial Instruments." ASC Topic 842 "Leases." ASC Topic 326 "Financial Instruments - Credit Losses." ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." ASC Topic 220 "Income Statement - Reporting Comprehensive Income."

Securities Available for Sale (

Securities Available for Sale (Policies)	3 Months Ended
	Mar. 31, 2018
Securities Available for Sale [Abstract]
Impairment of investment securities	The Company reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. In evaluating whether a security's decline in market value is other-than-temporary, management considers the length of time and extent to which the fair value has been less than cost, the financial condition of the issuer and the underlying obligors, quality of credit enhancements, volatility of the fair value of the security, the expected recovery period of the security and ratings agency evaluations. In addition, the Company may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds and the value of any underlying collateral.

Derivative Financial Instrume27

Derivative Financial Instruments (Policies)	3 Months Ended
	Mar. 31, 2018
Derivative Financial Instruments [Abstract]
Derivative financial instruments	In connection with its mortgage banking activities, the Company enters into derivative financial instruments as part of its strategy to manage its exposure to changes in interest rates. Mortgage banking derivatives include interest rate lock commitments provided to customers to fund mortgage loans to be sold in the secondary market and forward commitments for the future delivery of such loans to third party investors. It is the Company's practice to enter into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held for sale. The Company's mortgage banking derivatives have not been designated as hedge relationships. These instruments are used to manage the Company's exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of ASC 815. Changes in the fair value of derivatives not designated in hedging relationships are recorded as a component of mortgage banking income in the Company's consolidated statements of operations. The Company does not use derivatives for speculative purposes. Forward commitments to sell mortgage loans represent commitments obtained by the Company from a secondary market agency to purchase mortgages from the Company at specified interest rates and within specified periods of time. Commitments to sell loans are made to mitigate interest rate risk on interest rate lock commitments to originate loans and loans held for sale. At March 31, 2018, the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $377.0 million and interest rate lock commitments with an aggregate notional amount of approximately $296.4 million. The fair value of the forward commitments to sell mortgage loans at March 31, 2018 included a loss of $318,000 that is reported as a component of other liabilities on the Company's consolidated statement of financial condition. The fair value of the interest rate locks at March 31, 2018 included a gain of $3.3 million that is reported as a component of other assets on the Company's consolidated statements of financial condition. In determining the fair value of its derivative loan commitments, the Company considers the value that would be generated by the loan arising from exercise of the loan commitment when sold in the secondary mortgage market. That value includes the price that the loan is expected to be sold for in the secondary mortgage market. The fair value of these commitments is recorded on the consolidated statements of financial condition with the changes in fair value recorded as a component of mortgage banking income. The significant unobservable input used in the fair value measurement of the Company's mortgage banking derivatives, including interest rate lock commitments, is the loan pull through rate. This represents the percentage of loans currently in a lock position which the Company estimates will ultimately close. Generally, the fair value of an interest rate lock commitment will be positively (negatively) impacted when the prevailing interest rate is lower (higher) than the interest rate lock commitment. Generally, an increase in the pull through rate will result in the fair value of the interest rate lock increasing when in a gain position, or decreasing when in a loss position. The pull through rate is largely dependent on the loan processing stage that a loan is currently in and the change in prevailing interest rates from the time of the rate lock. The pull through rate is computed using historical data and the ratio is periodically reviewed by the Company. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages. The Company's agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold related to credit information, loan documentation and collateral, which if subsequently are untrue or breached, could require the Company to repurchase certain loans affected. The Company has only been required to make insignificant repurchases as a result of breaches of these representations and warranties. The Company's agreements to sell residential mortgage loans also contain limited recourse provisions. The recourse provisions are limited in that the recourse provision ends after certain payment criteria have been met. With respect to these loans, repurchase could be required if defined delinquency issues arose during the limited recourse period. Given that the underlying loans delivered to buyers are predominantly conventional first lien mortgages and that historical experience shows negligible losses and insignificant repurchase activity, management believes that losses and repurchases under the limited recourse provisions will continue to be insignificant.

Securities Available for Sale28

Securities Available for Sale (Tables)	3 Months Ended
	Mar. 31, 2018
Securities Available for Sale [Abstract]
Amortized cost and fair values of investment in securities available for sale	The amortized cost and fair values of the Company's investment in securities available for sale follow: March 31, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (In Thousands) Mortgage-backed securities $ 53,198 $ 157 $ (772 ) $ 52,583 Collateralized mortgage obligations: Government sponsored enterprise issued 58,158 1 (1,489 ) 56,670 Mortgage-related securities 111,356 158 (2,261 ) 109,253 Government sponsored enterprise bonds 500 - (2 ) 498 Municipal securities 62,312 674 (203 ) 62,783 Other debt securities 15,004 - (1,290 ) 13,714 Debt securities 77,816 674 (1,495 ) 76,995 Certificates of deposit 735 - - 735 $ 189,907 $ 832 $ (3,756 ) $ 186,983 December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (In Thousands) Mortgage-backed securities $ 57,351 $ 324 $ (240 ) $ 57,435 Collateralized mortgage obligations: Government sponsored enterprise issued 61,313 3 (816 ) 60,500 Mortgage-related securities 118,664 327 (1,056 ) 117,935 Government sponsored enterprise bonds 2,500 - (3 ) 2,497 Municipal securities 62,516 1,334 (81 ) 63,769 Other debt securities 15,005 12 (492 ) 14,525 Debt securities 80,021 1,346 (576 ) 80,791 Certificates of deposit 980 1 - 981 $ 199,665 $ 1,674 $ (1,632 ) $ 199,707
Amortized cost and fair values of investment securities by contractual maturity	The amortized cost and fair values of investment securities by contractual maturity at March 31, 2018 are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Fair Value (In Thousands) Debt and other securities Due within one year $ 8,202 $ 8,178 Due after one year through five years 24,745 24,628 Due after five years through ten years 33,943 34,456 Due after ten years 11,661 10,468 Mortgage-related securities 111,356 109,253 $ 189,907 $ 186,983
Total proceeds and gross gains and losses from sales of investment securities available for sale	Gross unrealized losses on securities available for sale and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows: March 31, 2018 Less than 12 months 12 months or longer Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss (In Thousands) Mortgage-backed securities $ 40,078 $ (595 ) $ 4,180 $ (177 ) $ 44,258 $ (772 ) Collateralized mortgage obligations: Government sponsored enterprise issued 35,746 (780 ) 20,319 (709 ) 56,065 (1,489 ) Government sponsored enterprise bonds 498 (2 ) - - 498 (2 ) Municipal securities 28,006 (201 ) 100 (2 ) 28,106 (203 ) Other debt securities 4,975 (29 ) 8,739 (1,261 ) 13,714 (1,290 ) Certificates of deposit - - - - - - $ 109,303 $ (1,607 ) $ 33,338 $ (2,149 ) $ 142,641 $ (3,756 ) December 31, 2017 Less than 12 months 12 months or longer Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss (In Thousands) Mortgage-backed securities $ 35,136 $ (143 ) $ 4,464 $ (97 ) $ 39,600 $ (240 ) Collateralized mortgage obligations: Government sponsored enterprise issued 37,949 (348 ) 21,651 (468 ) 59,600 (816 ) Government sponsored enterprise bonds 2,497 (3 ) - - 2,497 (3 ) Municipal securities 17,096 (80 ) 100 (1 ) 17,196 (81 ) Other debt securities - - 9,508 (492 ) 9,508 (492 ) Certificates of deposit - - - - - - $ 92,678 $ (574 ) $ 35,723 $ (1,058 ) $ 128,401 $ (1,632 )

Loans Receivable (Tables)

Loans Receivable (Tables)	3 Months Ended
	Mar. 31, 2018
Loan Receivable [Abstract]
Schedule of Components of Loans Receivable	Loans receivable at March 31, 2018 and December 31, 2017 are summarized as follows: March 31, 2018 December 31, 2017 (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 457,254 $ 439,597 Multi-family 571,690 578,440 Home equity 21,012 21,124 Construction and land 19,151 19,859 Commercial real estate 211,476 195,842 Consumer 240 255 Commercial loans 33,849 36,697 $ 1,314,672 $ 1,291,814 The Company provides several types of loans to its customers, including residential, construction, commercial and consumer loans. Significant loan concentrations are considered to exist for a financial institution when there are amounts loaned to one borrower or to multiple borrowers engaged in similar activities that would cause them to be similarly impacted by economic or other conditions. While the Company's credit risks are geographically concentrated in the Milwaukee metropolitan area, there are no concentrations with individual or groups of related borrowers. Qualifying loans receivable totaling $979.1 million and $971.3 million at March 31, 2018 and December 31, 2017, respectively, are pledged as collateral against $415.0 million and $375.0 million in outstanding Federal Home Loan Bank of Chicago ("FHLBC") advances under a blanket security agreement at March 31, 2018 and December 31, 2017. Certain of the Company's executive officers, directors, employees, and their related interests have loans with the Bank. As of March 31, 2018 and December 31, 2017, loans aggregating approximately $4.3 million and $4.5 million, respectively, were outstanding to such parties. None of these loans were considered impaired as of March 31, 2018 or December 31, 2017. As of March 31, 2018 and December 31, 2017, there were no loans 90 or more days past due and still accruing interest.
Analysis of Past Due Loans Receivable	An analysis of past due loans receivable as of March 31, 2018 and December 31, 2017 follows: As of March 31, 2018 1-59 Days Past Due (1) 60-89 Days Past Due (2) 90 Days or Greater Total Past Due Current (3) Total Loans (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 1,950 $ - $ 3,870 $ 5,820 $ 451,434 $ 457,254 Multi-family 15 - 386 401 571,289 571,690 Home equity 350 30 74 454 20,558 21,012 Construction and land - - - - 19,151 19,151 Commercial real estate - - 180 180 211,296 211,476 Consumer 46 - - 46 194 240 Commercial loans - - 26 26 33,823 33,849 Total $ 2,361 $ 30 $ 4,536 $ 6,927 $ 1,307,745 $ 1,314,672 As of December 31, 2017 1-59 Days Past Due (1) 60-89 Days Past Due (2) 90 Days or Greater Total Past Due Current (3) Total Loans (In Thousands) Mortgage loans: Residential real estate: One- to four-family $ 1,494 $ 146 $ 3,516 $ 5,156 $ 434,441 $ 439,597 Multi-family - 128 192 320 578,120 578,440 Home equity 68 - 56 124 21,000 21,124 Construction and land - - - - 19,859 19,859 Commercial real estate - - 184 184 195,658 195,842 Consumer - - - - 255 255 Commercial loans - 42 26 68 36,629 36,697 Total $ 1,562 $ 316 $ 3,974 $ 5,852 $ 1,285,962 $ 1,291,814 (1) Includes $109,000 and $241,000 at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status. (2) Includes $- and $15,000 at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status. (3) Includes $1.9 million and $1.8 million at March 31, 2018 and December 31, 2017, respectively, which are on non-accrual status.
Allowance for Loan Losses	A summary of the activity for the three months ended March 31, 2018 and 2017 in the allowance for loan losses follows: One- to Four- Family Multi-Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Three months ended March 31, 2018 Balance at beginning of period $ 5,794 $ 4,431 $ 356 $ 949 $ 1,881 $ 10 $ 656 $ 14,077 Provision (credit) for loan losses 58 (514 ) (19 ) (247 ) 25 (1 ) (182 ) (880 ) Charge-offs (60 ) - - - - - - (60 ) Recoveries 32 13 7 - 1 - - 53 Balance at end of period $ 5,824 $ 3,930 $ 344 $ 702 $ 1,907 $ 9 $ 474 $ 13,190 Three months ended March 31, 2017 Balance at beginning of period $ 7,164 $ 4,809 $ 364 $ 1,016 $ 1,951 $ 12 $ 713 $ 16,029 Provision (credit) for loan losses (328 ) (470 ) 13 (10 ) (306 ) (1 ) (109 ) (1,211 ) Charge-offs (213 ) (5 ) - - - - - (218 ) Recoveries 88 22 7 13 - - - 130 Balance at end of period $ 6,711 $ 4,356 $ 384 $ 1,019 $ 1,645 $ 11 $ 604 $ 14,730
Schedule of Allowance for Loan Loss for Loans Evaluated Individually and Collectively For Impairment	A summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class as of March 31, 2018 follows: One- to Four- Family Multi- Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Allowance related to loans individually evaluated for impairment $ 84 $ - $ 55 $ - $ 30 $ - $ - $ 169 Allowance related to loans collectively evaluated for impairment 5,740 3,930 289 702 1,877 9 474 13,021 Balance at end of period $ 5,824 $ 3,930 $ 344 $ 702 $ 1,907 $ 9 $ 474 $ 13,190 Loans individually evaluated for impairment $ 5,051 $ 1,179 $ 153 $ - $ 180 $ - $ 26 $ 6,589 Loans collectively evaluated for impairment 452,203 570,511 20,859 19,151 211,296 240 33,823 1,308,083 Total gross loans $ 457,254 $ 571,690 $ 21,012 $ 19,151 $ 211,476 $ 240 $ 33,849 $ 1,314,672 A summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class as of December 31, 2017 follows: One- to Four-Family Multi- Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) Allowance related to loans individually evaluated for impairment $ 77 $ - $ 44 $ - $ 34 $ - $ - $ 155 Allowance related to loans collectively evaluated for impairment 5,717 4,431 312 949 1,847 10 656 13,922 Balance at end of period $ 5,794 $ 4,431 $ 356 $ 949 $ 1,881 $ 10 $ 656 $ 14,077 Loans individually evaluated for impairment $ 7,418 $ 1,007 $ 185 $ - $ 540 $ - $ 26 $ 9,176 Loans collectively evaluated for impairment 432,179 577,433 20,939 19,859 195,302 255 36,671 1,282,638 Total gross loans $ 439,597 $ 578,440 $ 21,124 $ 19,859 $ 195,842 $ 255 $ 36,697 $ 1,291,814
Internal Risk Rating of Loans Receivable	The following table presents information relating to the Company's internal risk ratings of its loans receivable as of March 31, 2018 and December 31, 2017: One to Four- Family Multi-Family Home Equity Construction and Land Commercial Real Estate Consumer Commercial Total (In Thousands) At March 31, 2018 Substandard $ 7,953 $ 1,179 $ 153 $ - $ 1,047 $ - $ 1,573 $ 11,905 Watch 4,774 329 472 - 288 - 719 6,582 Pass 444,527 570,182 20,387 19,151 210,141 240 31,557 1,296,185 $ 457,254 $ 571,690 $ 21,012 $ 19,151 $ 211,476 $ 240 $ 33,849 $ 1,314,672 At December 31, 2017 Substandard $ 7,581 $ 1,135 $ 138 $ - $ 1,124 $ - $ 1,585 $ 11,563 Watch 4,939 330 401 - 295 - 741 6,706 Pass 427,077 576,975 20,585 19,859 194,423 255 34,371 1,273,545 $ 439,597 $ 578,440 $ 21,124 $ 19,859 $ 195,842 $ 255 $ 36,697 $ 1,291,814
Impaired Loan Receivables	The following tables present data on impaired loans at March 31, 2018 and December 31, 2017. As of or for the Three Months Ended March 31, 2018 Recorded Investment Unpaid Principal Reserve Cumulative Charge-Offs Average Recorded Investment Interest Paid (In Thousands) Total Impaired with Reserve One- to four-family $ 736 $ 736 $ 84 $ - $ 738 $ 9 Multi-family - - - - - - Home equity 97 97 55 - 98 2 Construction and land - - - - - - Commercial real estate 30 439 30 409 32 - Consumer - - - - - - Commercial - - - - - - 863 1,272 169 409 868 11 Total Impaired with no Reserve One- to four-family 4,315 4,780 - 465 4,364 64 Multi-family 1,179 2,039 - 860 1,190 21 Home equity 56 56 - - 57 1 Construction and land - - - - - - Commercial real estate 150 150 - - 150 - Consumer - - - - - - Commercial 26 26 - - 26 - 5,726 7,051 - 1,325 5,787 86 Total Impaired One- to four-family 5,051 5,516 84 465 5,102 73 Multi-family 1,179 2,039 - 860 1,190 21 Home equity 153 153 55 - 155 3 Construction and land - - - - - - Commercial real estate 180 589 30 409 182 - Consumer - - - - - - Commercial 26 26 - - 26 - $ 6,589 $ 8,323 $ 169 $ 1,734 $ 6,655 $ 97 As of or for the Year Ended December 31, 2017 Recorded Investment Unpaid Principal Reserve Cumulative Charge-Offs Average Recorded Investment Interest Paid (In Thousands) Total Impaired with Reserve One- to four-family $ 903 $ 903 $ 77 $ - $ 913 $ 52 Multi-family - - - - - - Home equity 79 79 44 - 83 6 Construction and land - - - - - - Commercial real estate 34 443 34 409 43 - Consumer - - - - - - Commercial - - - - - - 1,016 1,425 155 409 1,039 58 Total Impaired with no Reserve One- to four-family 6,515 7,604 - 1,089 6,796 359 Multi-family 1,007 1,864 - 857 1,005 94 Home equity 106 106 - - 111 5 Construction and land - - - - - - Commercial real estate 506 506 - - 513 19 Consumer - - - - - - Commercial 26 26 - - 26 - 8,160 10,106 - 1,946 8,451 477 Total Impaired One- to four-family 7,418 8,507 77 1,089 7,709 411 Multi-family 1,007 1,864 - 857 1,005 94 Home equity 185 185 44 - 194 11 Construction and land - - - - - - Commercial real estate 540 949 34 409 556 19 Consumer - - - - - - Commercial 26 26 - - 26 - $ 9,176 $ 11,531 $ 155 $ 2,355 $ 9,490 $ 535
Troubled Debt Restructurings on Loan Receivables	The following presents data on troubled debt restructurings: As of March 31, 2018 Accruing Non-accruing Total Amount Number Amount Number Amount Number (Dollars in Thousands) One- to four-family $ 2,740 2 $ 1,111 7 $ 3,851 9 Multi-family - - 793 3 793 3 Commercial real estate 288 1 30 1 318 2 $ 3,028 3 $ 1,934 11 $ 4,962 14 As of December 31, 2017 Accruing Non-accruing Total Amount Number Amount Number Amount Number (Dollars in Thousands) One- to four-family $ 2,740 2 $ 1,156 7 $ 3,896 9 Multi-family - - 815 3 815 3 Home equity 47 1 - - 47 1 Commercial real estate 290 1 34 1 324 2 $ 3,077 4 $ 2,005 11 $ 5,082 15
Schedule of Troubled Debt Restructurings by Concession Type	The following presents troubled debt restructurings by concession type: As of March 31, 2018 Performing in accordance with modified terms In Default Total Amount Number Amount Number Amount Number (Dollars in Thousands) Interest reduction and principal forbearance $ 4,583 10 $ 30 1 $ 4,613 11 Principal forbearance - - - - - - Interest reduction 349 3 - - 349 3 $ 4,932 13 $ 30 1 $ 4,962 14 As of December 31, 2017 Performing in accordance with modified terms In Default Total Amount Number Amount Number Amount Number (Dollars in Thousands) Interest reduction and principal forbearance $ 4,022 9 $ 660 2 $ 4,682 11 Principal forbearance 47 1 - - 47 1 Interest reduction 353 3 - - 353 3 $ 4,422 13 $ 660 2 $ 5,082 15 There were no loans modified as troubled debt restructurings during the three months ended March 31, 2018 and March 31, 2017. There were no troubled debt restructurings within the past twelve months for which there was a default during the three months ended March 31, 2018 and March 31, 2017.
Schedule of Loans Receivables, Non Accrual Status	The following table presents data on non-accrual loans as of March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 (Dollars in Thousands) Non-accrual loans: Residential One- to four-family $ 5,051 $ 4,677 Multi-family 1,178 1,007 Home equity 122 107 Construction and land - - Commercial real estate 180 251 Commercial 26 26 Consumer - - Total non-accrual loans $ 6,557 $ 6,068 Total non-accrual loans to total loans receivable 0.50 % 0.47 % Total non-accrual loans to total assets 0.36 % 0.34 %

Real Estate Owned (Tables)

Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2018
Real Estate Owned [Abstract]
Summary of real estate owned	Real estate owned is summarized as follows: March 31, 2018 December 31, 2017 (In Thousands) One- to four-family $ 1,062 $ 1,330 Multi-family - - Construction and land 3,663 4,582 Commercial real estate 300 300 Total real estate owned 5,025 6,212 Valuation allowance at end of period (1,651 ) (1,654 ) Total real estate owned, net $ 3,374 $ 4,558 The following table presents the activity in the Company's real estate owned: Three months ended March 31, 2018 2017 (In Thousands) Real estate owned at beginning of the period $ 4,558 6,118 Transferred from loans receivable 238 416 Sales (net of gains / losses) (1,165 ) (1,009 ) Write downs (257 ) (455 ) Other - - Real estate owned at the end of the period $ 3,374 5,070 Residential one- to four-family mortgage loans that were in the process of foreclosure were $2.1 million and $2.3 million at March 31, 2018 and December 31, 2017, respectively.

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Servicing Rights [Abstract]
Mortgage Servicing Rights Activity	The following table presents the activity in the Company's mortgage servicing rights: Three months ended March 31, 2018 2017 (In Thousands) Mortgage servicing rights at beginning of the period $ 888 $ 2,260 Additions 100 314 Amortization (49 ) (19 ) Sales - (2,264 ) Mortgage servicing rights at end of the period 939 291 Valuation allowance at end of period - - Mortgage servicing rights at end of the period, net $ 939 $ 291
Estimated Amortization Expense of Mortgage Servicing Rights	The following table shows the estimated future amortization expense for mortgage servicing rights for the periods indicated: Estimate for the period ending December 31: (In Thousands) 2018 $ 102 2019 120 2020 111 2021 101 2022 92 Thereafter 413 Total $ 939

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2018
Deposits [Abstract]
Contractual maturities of time deposits	At March 31, 2018 and December 31, 2017, time deposits with balances greater than $250,000 amounted to $51.3 million and $45.9 million, respectively. A summary of the contractual maturities of time deposits at March 31, 2018 is as follows: (In Thousands) Within one year $ 522,568 More than one to two years 155,048 More than two to three years 15,534 More than three to four years 1,129 More than four through five years 2,919 $ 697,198

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2018
Borrowings [Abstract]
Borrowings	Borrowings consist of the following: March 31, 2018 December 31, 2017 Balance Weighted Average Rate Balance Weighted Average Rate (Dollars in Thousands) Short term: Repurchase agreement $ 19,365 4.63 % $ 11,285 4.32 % Federal Home Loan Bank, Chicago advances 10,000 1.80 % 35,000 1.28 % Long term: Federal Home Loan Bank, Chicago advances maturing: 2018 50,000 3.04 % 65,000 2.97 % 2021 100,000 0.78 % 100,000 0.78 % 2027 175,000 1.38 % 175,000 1.38 % 2028 80,000 2.24 % - - $ $ 434,365 1.61 % $ $ 386,285 1.57 %

Regulatory Capital (Tables)

Regulatory Capital (Tables)	3 Months Ended
	Mar. 31, 2018
Regulatory Capital [Abstract]
Actual and required capital amounts and ratios	The actual and required capital amounts and ratios for the Bank as of March 31, 2018 and December 31, 2017 are presented in the table below: March 31, 2018 Actual For Capital Adequacy Purposes Minimum Capital Adequacy with Capital Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars In Thousands) Total Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. $ 412,639 29.96 % $ 110,202 8.00 % $ 136,030 9.875 % $ N/A N/A WaterStone Bank 383,288 27.85 % 110,096 8.00 % 135,899 9.875 % 137,619 10.00 % Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 399,449 29.00 % 82,651 6.00 % 108,480 7.875 % N/A N/A WaterStone Bank 370,098 26.89 % 82,572 6.00 % 108,375 7.875 % 110,096 8.00 % Common Equity Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 399,449 29.00 % 61,988 4.50 % 87,817 6.375 % N/A N/A WaterStone Bank 370,098 26.89 % 61,929 4.50 % 87,732 6.375 % 89,453 6.50 % Tier 1 Capital (to average assets) Consolidated Waterstone Financial, Inc. 399,449 22.31 % 71,612 4.00 % N/A N/A N/A N/A WaterStone Bank 370,098 20.67 % 71,612 4.00 % N/A N/A 89,516 5.00 % State of Wisconsin (to total assets) WaterStone Bank 370,098 20.17 % 110,101 6.00 % N/A N/A N/A N/A December 31, 2017 (Dollars In Thousands) Total Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. $ 426,057 30.75 % $ 110,829 8.00 % $ 128,146 9.25 % $ N/A N/A WaterStone Bank 400,792 28.93 % 110,812 8.00 % 128,127 9.25 % 138,515 10.00 % Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 411,980 29.74 % 83,122 6.00 % 100,439 7.25 % N/A N/A WaterStone Bank 386,715 27.92 % 83,109 6.00 % 100,424 7.25 % 110,812 8.00 % Common Equity Tier 1 Capital (to risk-weighted assets) Consolidated Waterstone Financial, Inc. 411,980 29.74 % 62,341 4.50 % 79,658 5.75 % N/A N/A WaterStone Bank 386,715 27.92 % 62,332 4.50 % 79,646 5.75 % 90,035 6.50 % Tier 1 Capital (to average assets) Consolidated Waterstone Financial, Inc. 411,980 22.43 % 73,481 4.00 % N/A N/A N/A N/A WaterStone Bank 386,715 21.10 % 73,304 4.00 % N/A N/A 91,630 5.00 % State of Wisconsin (to total assets) WaterStone Bank 386,715 21.44 % 108,243 6.00 % N/A N/A N/A N/A

Offsetting of Assets and Liab35

Offsetting of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Offsetting of Assets and Liabilities [Abstract]
Repurchase liabilities	The following table presents the liabilities subject to an enforceable master netting agreement as of March 31, 2018 and December 31, 2017. Gross Recognized Liabilities Gross Amounts Offset Net Amounts Presented Gross Amounts Not Offset Net Amount (In Thousands) March 31, 2018 Repurchase Agreements Short-term $ 19,365 $ - $ 19,365 $ 19,365 $ - Long-term - - - - - $ 19,365 $ - $ 19,365 $ 19,365 $ - December 31, 2017 Repurchase Agreements Short-term $ 11,285 $ - $ 11,285 $ 11,285 $ - Long-term - - - - - $ 11,285 $ - $ 11,285 $ 11,285 $ -

Commitments, Off-Balance Shee36

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities [Abstract]
Financial Instruments with Off-Balance Sheet Risk	The Company is a 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 and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated statements of financial condition. The contract or notional amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. March 31, 2018 December 31, 2017 (In Thousands) Financial instruments whose contract amounts represent potential credit risk: Commitments to extend credit under amortizing loans (1) $ 53,445 $ 31,543 Commitments to extend credit under home equity lines of credit (2) 15,080 14,972 Unused portion of construction loans (3) 24,194 17,097 Unused portion of business lines of credit 16,078 16,878 Standby letters of credit 267 259 (1) (2) (3)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings loss per share	Presented below are the calculations for basic and diluted earnings per share: Three months ended March 31, 2018 2017 Net income $ 6,953 6,572 Weighted average shares outstanding 27,509 27,323 Effect of dilutive potential common shares $ 293 544 Diluted weighted average shares outstanding $ 27,802 27,867 Basic earnings per share $ 0.25 0.24 Diluted earnings per share $ 0.25 0.24

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured On Recurring Basis	The following table presents information about our assets recorded in our consolidated statement of financial condition at their fair value on a recurring basis as of March 31, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. Fair Value Measurements Using March 31, 2018 Level 1 Level 2 Level 3 (In Thousands) Available for sale securities Mortgage-backed securities $ 52,583 $ - $ 52,583 $ - Collateralized mortgage obligations Government sponsored enterprise issued 56,670 - 56,670 - Government sponsored enterprise bonds 498 - 498 - Municipal securities 62,783 - 62,783 - Other debt securities 13,714 - 13,714 - Certificates of deposit 735 - 735 - Loans held for sale 127,638 - 127,638 - Mortgage banking derivative assets 3,299 - - 3,299 Mortgage banking derivative liabilities 318 - - 318 Fair Value Measurements Using December 31, 2017 Level 1 Level 2 Level 3 (In Thousands) Available for sale securities Mortgage-backed securities $ 57,435 $ - $ 57,435 $ - Collateralized mortgage obligations Government sponsored enterprise issued 60,500 - 60,500 - Government sponsored enterprise bonds 2,497 - 2,497 - Municipal securities 63,769 - 63,769 - Other debt securities 14,525 - 14,525 - Certificates of deposit 981 - 981 - Loans held for sale 149,896 - 149,896 - Mortgage banking derivative assets 2,004 - - 2,004 Mortgage banking derivative liabilities - - - -
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The table below presents reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during 2018 and 2017. Mortgage banking derivatives, net (In Thousands) Balance at December 31, 2016 $ 3,334 Mortgage derivative gain, net (1,330 ) Balance at December 31, 2017 $ 2,004 Mortgage derivative loss, net 977 Balance at March 31, 2018 $ 2,981
Fair Value Measurements, Nonrecurring	Assets Recorded at Fair Value on a Non-recurring Basis The following tables present information about our assets recorded in our consolidated statement of financial condition at their fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. Fair Value Measurements Using March 31, 2018 Level 1 Level 2 Level 3 (In Thousands) Impaired loans, net (1) $ 694 $ - $ - $ 694 Real estate owned 3,374 - - 3,374 Mortgage servicing rights 1,350 - - 1,350 Fair Value Measurements Using December 31, 2017 Level 1 Level 2 Level 3 (In Thousands) Impaired loans, net (1) $ 861 $ - $ - $ 861 Real estate owned 4,558 - - 4,558 Mortgage servicing rights 1,125 - - 1,125 (1) Represents collateral-dependent impaired loans, net, which are included in loans.
Fair Value, by Balance Sheet Grouping	The carrying amounts and fair values of the Company's financial instruments consist of the following: March 31, 2018 December 31, 2017 Carrying amount Fair Value Carrying amount Fair Value Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 (In Thousands) Financial Assets Cash and cash equivalents $ 83,407 $ 83,407 $ 80,407 $ 3,000 $ - $ 48,607 $ 48,607 $ 39,607 $ 9,000 $ - Securities available-for-sale 186,983 186,983 - 186,983 - 199,707 199,707 - 199,707 - Loans held for sale 127,638 127,638 - 127,638 - 149,896 149,896 - 149,896 - Loans receivable 1,314,672 1,287,014 - - 1,287,014 1,291,814 1,291,142 - - 1,291,142 FHLB stock 18,675 18,675 - 18,675 - 16,875 16,875 - 16,875 - Accrued interest receivable 5,197 5,197 5,197 - - 4,924 4,924 4,924 - - Mortgage servicing rights 939 1,350 - - 1,350 888 1,125 - - 1,125 Mortgage banking derivative assets 3,299 3,299 - - 3,299 2,004 2,004 - - 2,004 Financial Liabilities Deposits 974,224 973,730 277,026 696,704 - 967,380 967,558 278,401 689,157 - Advance payments by borrowers for taxes 12,004 12,004 12,004 - - 4,876 4,876 4,876 - - Borrowings 434,365 431,172 - 431,172 - 386,285 384,348 - 384,348 - Accrued interest payable 904 904 904 - - 886 886 886 - - Mortgage banking derivative liabilities 318 318 - - 318 - - - - -

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	As of or for the three months ended March 31, 2018 Community Banking Mortgage Banking Holding Company and Other Consolidated (In Thousands) Net interest income $ 13,304 (192 ) 29 13,141 Provision for loan losses (900 ) 20 - (880 ) Net interest income after provision for loan losses 14,204 (212 ) 29 14,021 Noninterest income 939 24,731 (487 ) 25,183 Noninterest expenses: Compensation, payroll taxes, and other employee benefits 4,888 16,241 (146 ) 20,983 Occupancy, office furniture and equipment 826 1,813 - 2,639 FDIC insurance premiums 125 - - 125 Real estate owned 317 - - 317 Other 1,526 4,887 (330 ) 6,083 Total noninterest expenses 7,682 22,941 (476 ) 30,147 Income before income taxes 7,461 1,578 18 9,057 Income tax expense 1,668 435 1 2,104 Net income $ 5,793 1,143 17 6,953 Total assets $ 1,819,569 158,267 (138,572 ) 1,839,264 As of or for the three months ended March 31, 2017 Community Banking Mortgage Banking Holding Company and Other Consolidated (In Thousands) Net interest income $ 11,680 100 115 11,895 Provision for loan losses (1,300 ) 89 - (1,211 ) Net interest income after provision for loan losses 12,980 11 115 13,106 Noninterest income 812 25,385 (260 ) 25,937 Noninterest expenses: Compensation, payroll taxes, and other employee benefits 4,328 15,789 (122 ) 19,995 Occupancy, office furniture and equipment 841 1,686 - 2,527 FDIC insurance premiums 120 - - 120 Real estate owned 411 - - 411 Other 1,257 4,861 (113 ) 6,005 Total noninterest expenses 6,957 22,336 (235 ) 29,058 Income before income taxes 6,835 3,060 90 9,985 Income tax expense 2,159 1,234 20 3,413 Net income $ 4,676 1,826 70 6,572 Total assets $ 1,735,619 154,984 (163,430 ) 1,727,173

Securities Available for Sale40

Securities Available for Sale (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)Security	Dec. 31, 2017USD ($)	Dec. 31, 2014USD ($)	Mar. 31, 2017USD ($)
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	$ 189,907,000	$ 199,665,000
Gross unrealized gains	832,000	1,674,000
Gross unrealized losses	(3,756,000)	(1,632,000)
Fair Value	186,983,000	199,707,000
Loss on sale of securities	1
Amortized cost of investment securities by contractual maturity [Abstract]
Due within one year	8,202,000
Due after one year through five years	24,745,000
Due after five years through ten years	33,943,000
Due after ten years	11,661,000
Mortgage-related securities	111,356,000
Amortized Cost	189,907,000	199,665,000
Fair value of investment securities by contractual maturity [Abstract]
Due within one year	8,178,000
Due after one year through five years	24,628,000
Due after five years through ten years	34,456,000
Due after ten years	10,468,000
Mortgage-related securities	109,253,000
Fair Value	186,983,000	199,707,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	109,303,000	92,678,000
12 months or longer	33,338,000	35,723,000
Fair value	142,641,000	128,401,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(1,607,000)	(574,000)
12 months or longer	(2,149,000)	(1,058,000)
Unrealized loss	(3,756,000)	(1,632,000)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Credit related impairments on securities as of beginning of period	94,000	94,000
Credit-related impairments related to securities for which an other- than-temporary impairment was not previously recognized	0	0
Additional credit impairments on securities
Credit related impairments on securities as of end of period	94,000	94,000
Amortized Cost	116,000
Mortgage-Backed Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	53,198,000	57,351,000
Gross unrealized gains	157,000	324,000
Gross unrealized losses	(772,000)	(240,000)
Fair Value	$ 52,583,000	57,435,000
Number of securities that were other-than-temporarily impaired | Security	0
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	$ 53,198,000	57,351,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	52,583,000	57,435,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	40,078,000	35,136,000
12 months or longer	4,180,000	4,464,000
Fair value	44,258,000	39,600,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(595,000)	(143,000)
12 months or longer	(177,000)	(97,000)
Unrealized loss	(772,000)	(240,000)
Collateralized Mortgage Obligations, Government Sponsored Enterprise Issued [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	58,158,000	61,313,000
Gross unrealized gains	1,000	3,000
Gross unrealized losses	(1,489,000)	(816,000)
Fair Value	56,670,000	60,500,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	58,158,000	61,313,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	56,670,000	60,500,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	35,746,000	37,949,000
12 months or longer	20,319,000	21,651,000
Fair value	56,065,000	59,600,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(780,000)	(348,000)
12 months or longer	(709,000)	(468,000)
Unrealized loss	(1,489,000)	(816,000)
Mortgage-Related Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	111,356,000	118,664,000
Gross unrealized gains	158,000	327,000
Gross unrealized losses	(2,261,000)	(1,056,000)
Fair Value	109,253,000	117,935,000
Securities pledged as collateral to secure repurchase agreements or related to mortgage banking activities	2,300,000			$ 2,300,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	111,356,000	118,664,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	109,253,000	117,935,000
Government-Sponsored Enterprise Bonds [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	500,000	2,500,000
Gross unrealized gains	0	0
Gross unrealized losses	(2,000)	(3,000)
Fair Value	498,000	2,497,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	500,000	2,500,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	498,000	2,497,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	498,000	2,497,000
12 months or longer	0	0
Fair value	498,000	2,497,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(2,000)	(3,000)
12 months or longer	0	0
Unrealized loss	(2,000)	(3,000)
Municipal Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	62,312,000	62,516,000
Gross unrealized gains	674,000	1,334,000
Gross unrealized losses	(203,000)	(81,000)
Fair Value	$ 62,783,000	63,769,000
Number of securities that were in unrealized loss position twelve months or longer | Security	5
Securities pledged as collateral to secure repurchase agreements or related to mortgage banking activities	$ 0
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	62,312,000	62,516,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	62,783,000	63,769,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	28,006,000	17,096,000
12 months or longer	100,000	100,000
Fair value	28,106,000	17,196,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(201,000)	(80,000)
12 months or longer	(2,000)	(1,000)
Unrealized loss	(203,000)	(81,000)
Other Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	15,004,000	15,005,000
Gross unrealized gains	0	12,000
Gross unrealized losses	(1,290,000)	(492,000)
Fair Value	$ 13,714,000	14,525,000
Number of securities that were in unrealized loss position twelve months or longer | Security	14
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	$ 15,004,000	15,005,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	13,714,000	14,525,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	4,975,000	0
12 months or longer	8,739,000	9,508,000
Fair value	13,714,000	9,508,000
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	(29,000)	0
12 months or longer	(1,261,000)	(492,000)
Unrealized loss	(1,290,000)	(492,000)
Debt Securities [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	77,816,000	80,021,000
Gross unrealized gains	674,000	1,346,000
Gross unrealized losses	(1,495,000)	(576,000)
Fair Value	76,995,000	80,791,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	77,816,000	80,021,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	76,995,000	80,791,000
Certificates of Deposit [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	735,000	980,000
Gross unrealized gains	0	1,000
Gross unrealized losses	0	0
Fair Value	735,000	981,000
Amortized cost of investment securities by contractual maturity [Abstract]
Amortized Cost	735,000	980,000
Fair value of investment securities by contractual maturity [Abstract]
Fair Value	735,000	981,000
Fair value of securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0	0
12 months or longer	0	0
Fair value	0	0
Unrealized loss on securities available for sale in a continuous unrealized loss position [Abstract]
Less than 12 months	0	0
12 months or longer	0	0
Unrealized loss	$ 0	$ 0

Loans Receivable, Part I (Detai

Loans Receivable, Part I (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans [Abstract]
Loans receivable	$ 1,314,672	$ 1,291,814
Loans receivable pledged as collateral	979,100	971,300
Advances by Federal Home Loan Bank	415,000	375,000
Residential Real Estate [Member] | One-to-Four Family [Member]
Mortgage Loans [Abstract]
Loans receivable	457,254	439,597
Residential Real Estate [Member] | Multi Family [Member]
Mortgage Loans [Abstract]
Loans receivable	571,690	578,440
Residential Real Estate [Member] | Home Equity [Member]
Mortgage Loans [Abstract]
Loans receivable	21,012	21,124
Construction and Land [Member]
Mortgage Loans [Abstract]
Loans receivable	19,151	19,859
Commercial Real Estate [Member]
Mortgage Loans [Abstract]
Loans receivable	211,476	195,842
Consumer [Member]
Mortgage Loans [Abstract]
Loans receivable	240	255
Commercial Loans [Member]
Mortgage Loans [Abstract]
Loans receivable	$ 33,849	$ 36,697

Loans Receivable, Part II (Deta

Loans Receivable, Part II (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		$ 6,927,000	$ 5,852,000
Current	[1]	1,307,745,000	1,285,962,000
Total Loans		1,314,672,000	1,291,814,000
Loan Receivable, Nonaccrual Status		1,900,000	1,800,000
90 or more days past due		0	0
1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	2,361,000	1,562,000
Loan Receivable, Nonaccrual Status		109,000	241,000
60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	30,000	316,000
Loan Receivable, Nonaccrual Status		0	15,000,000,000
Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		4,536,000	3,974,000
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		5,820,000	5,156,000
Current	[1]	451,434,000	434,441,000
Total Loans		457,254,000	439,597,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	1,950,000	1,494,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	146,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		3,870,000	3,516,000
Residential Real Estate [Member] | Multi Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		401,000	320,000
Current	[1]	571,289,000	578,120,000
Total Loans		571,690,000	578,440,000
Residential Real Estate [Member] | Multi Family [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	15,000	0
Residential Real Estate [Member] | Multi Family [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	128,000
Residential Real Estate [Member] | Multi Family [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		386,000	192,000
Residential Real Estate [Member] | Home Equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		454,000	124,000
Current	[1]	20,558,000	21,000,000
Total Loans		21,012,000	21,124,000
Residential Real Estate [Member] | Home Equity [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	350,000	68,000
Residential Real Estate [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	30,000	0
Residential Real Estate [Member] | Home Equity [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		74,000	56,000
Construction and Land [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Current	[1]	19,151,000	19,859,000
Total Loans		19,151,000	19,859,000
Construction and Land [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Construction and Land [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Construction and Land [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Commercial Real Estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		180,000	184,000
Current	[1]	211,296,000	195,658,000
Total Loans		211,476,000	195,842,000
Commercial Real Estate [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		180,000	184,000
Consumer [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		46,000	0
Current	[1]	194,000	255,000
Total Loans		240,000	255,000
Consumer [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	46,000	0
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Consumer [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Commercial Loans [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		26,000	68,000
Current	[1]	33,823,000	36,629,000
Total Loans		33,849,000	36,697,000
Commercial Loans [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	42,000
Commercial Loans [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		$ 26,000	$ 26,000
[1]	Includes $1.9 million and $4.4 million at June 30, 2017 and December 31, 2016, respectively, which are on non-accrual status.
[2]	Includes $59,000 and $148,000 at June 30, 2017 and December 31, 2016, respectively, which are on non-accrual status.
[3]	Includes $1.3 million and $- at June 30, 2017 and December 31, 2016, respectively, which are on non-accrual status.

Loans Receivable, Part III (Det

Loans Receivable, Part III (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 14,077	$ 16,029
Provision (credit) for loan losses	(880)	(1,211)
Charge-offs	(60)	(218)
Recoveries	53	130
Balance at end of period	13,190	14,730
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			$ 169	$ 155
Allowance related to loans collectively evaluated for impairment			13,021	13,922
Provision for loan losses	14,077	16,029	13,190	14,077
Loans individually evaluated for impairment			6,589	9,176
Loans collectively evaluated for impairment			1,308,083	1,282,638
Total gross loans			1,314,672	1,291,814
Total loans			1,314,672	1,291,814
Residential Real Estate [Member] | One-to-Four Family [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	5,794	7,164
Provision (credit) for loan losses	58	(328)
Charge-offs	(60)	(213)
Recoveries	32	88
Balance at end of period	5,824	6,711
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			84	77
Allowance related to loans collectively evaluated for impairment			5,740	5,717
Provision for loan losses	5,794	7,164	5,824	5,794
Loans individually evaluated for impairment			5,051	7,418
Loans collectively evaluated for impairment			452,203	432,179
Total gross loans			457,254	439,597
Total loans			457,254	439,597
Residential Real Estate [Member] | Multi Family [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	4,431	4,809
Provision (credit) for loan losses	(514)	(470)
Charge-offs	0	(5)
Recoveries	13	22
Balance at end of period	3,930	4,356
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			0	0
Allowance related to loans collectively evaluated for impairment			3,930	4,431
Provision for loan losses	4,431	4,809	3,930	4,431
Loans individually evaluated for impairment			1,179	1,007
Loans collectively evaluated for impairment			570,511	577,433
Total gross loans			571,690	578,440
Total loans			571,690	578,440
Residential Real Estate [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	356	364
Provision (credit) for loan losses	(19)	13
Charge-offs	0	0
Recoveries	7	7
Balance at end of period	344	384
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			55	44
Allowance related to loans collectively evaluated for impairment			289	312
Provision for loan losses	356	364	344	356
Loans individually evaluated for impairment			153	185
Loans collectively evaluated for impairment			20,859	20,939
Total gross loans			21,012	21,124
Total loans			21,012	21,124
Construction and Land [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	949	1,016
Provision (credit) for loan losses	(247)	(10)
Charge-offs	0	0
Recoveries	0	13
Balance at end of period	702	1,019
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			0	0
Allowance related to loans collectively evaluated for impairment			702	949
Provision for loan losses	949	1,016	702	949
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			19,151	19,859
Total gross loans			19,151	19,859
Total loans			19,151	19,859
Commercial Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	1,881	1,951
Provision (credit) for loan losses	25	(306)
Charge-offs	0	0
Recoveries	1	0
Balance at end of period	1,907	1,645
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			30	34
Allowance related to loans collectively evaluated for impairment			1,877	1,847
Provision for loan losses	1,881	1,951	1,907	1,881
Loans individually evaluated for impairment			180	540
Loans collectively evaluated for impairment			211,296	195,302
Total gross loans			211,476	195,842
Total loans			211,476	195,842
Consumer [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	10	12
Provision (credit) for loan losses	(1)	(1)
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	9	11
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			0	0
Allowance related to loans collectively evaluated for impairment			9	10
Provision for loan losses	10	12	9	10
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			240	255
Total gross loans			240	255
Total loans			240	255
Commercial Loans [Member]
Allowance for loan losses [Roll Forward]
Balance at beginning of period	656	713
Provision (credit) for loan losses	(182)	(109)
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	474	604
Summary of the allowance for loan loss for loans evaluated individually and collectively for impairment by collateral class [Abstract]
Allowance related to loans individually evaluated for impairment			0	0
Allowance related to loans collectively evaluated for impairment			474	656
Provision for loan losses	$ 656	$ 713	474	656
Loans individually evaluated for impairment			26	26
Loans collectively evaluated for impairment			33,823	36,671
Total gross loans			33,849	36,697
Total loans			$ 33,849	$ 36,697

Loans Receivable, Part IV (Deta

Loans Receivable, Part IV (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2015	Dec. 31, 2017
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	$ 1,314,672,000		$ 1,291,814,000
Loans requiring an officers' loans committee review and approval, minimum	500,000
Minimum amount of potential loan exposure to be reviewed by credit management personnel	$ 1,000,000
Maximum period of time loan is reviewed if renewed	1 year
Period of time sales of real estate owned fair value is based	2 years
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	$ 863,000		1,016,000
Total Impaired, with no Reserve, Recorded Investment	5,726,000		8,160,000
Total Impaired, Recorded Investment	6,589,000		9,176,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	1,272,000		1,425,000
Total Impaired with no Reserve, Unpaid Principal Balance	7,051,000		10,106,000
Total Impaired, Unpaid Principal Balance, Total	8,323,000		11,531,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	169,000		155,000
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	169,000		155,000
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	409,000		409,000
Total Impaired with no Reserve, Cumulative Charge-offs	1,325,000		1,946,000
Total Impaired, Cumulative Charge-offs	1,734,000		2,355,000
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	868,000	$ 1,039,000
Total Impaired with no Reserve, Average Recorded Investment	5,787,000	8,451,000
Total Impaired, Average Recorded Investment, Total	6,655,000	9,490,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	11,000	58,000
Total Impaired with no Reserve, Interest Paid YTD	86,000	477,000
Total Impaired, Interest Paid YTD	97,000	535,000
Charge-offs recorded to reduce the unpaid principal balance	1,300,000
Total impaired loans including troubled debt restructurings	4,962,000		5,082,000
Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	11,905,000		11,563,000
Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	6,582,000		6,706,000
Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	1,296,185,000		1,273,545,000
Residential Real Estate [Member] | One-to-Four Family [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	457,254,000		439,597,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	736,000		903,000
Total Impaired, with no Reserve, Recorded Investment	4,315,000		6,515,000
Total Impaired, Recorded Investment	5,051,000		7,418,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	736,000		903,000
Total Impaired with no Reserve, Unpaid Principal Balance	4,780,000		7,604,000
Total Impaired, Unpaid Principal Balance, Total	5,516,000		8,507,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	84,000		77,000
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	84,000		77,000
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	465,000		1,089,000
Total Impaired, Cumulative Charge-offs	465,000		1,089,000
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	738,000	913,000
Total Impaired with no Reserve, Average Recorded Investment	4,364,000	6,796,000
Total Impaired, Average Recorded Investment, Total	5,102,000	7,709,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	9,000	52,000
Total Impaired with no Reserve, Interest Paid YTD	64,000	359,000
Total Impaired, Interest Paid YTD	73,000	411,000
Total impaired loans including troubled debt restructurings	3,851,000		3,896,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	7,953,000		7,581,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	4,774,000		4,939,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	444,527,000		427,077,000
Residential Real Estate [Member] | Multi Family [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	571,690,000		578,440,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	0		0
Total Impaired, with no Reserve, Recorded Investment	1,179,000		1,007,000
Total Impaired, Recorded Investment	1,179,000		1,007,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	0		0
Total Impaired with no Reserve, Unpaid Principal Balance	2,039,000		1,864,000
Total Impaired, Unpaid Principal Balance, Total	2,039,000		1,864,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	0		0
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	0		0
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	860,000		857,000
Total Impaired, Cumulative Charge-offs	860,000		857,000
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	0	0
Total Impaired with no Reserve, Average Recorded Investment	1,190,000	1,005,000
Total Impaired, Average Recorded Investment, Total	1,190,000	1,005,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	0	0
Total Impaired with no Reserve, Interest Paid YTD	21,000	94,000
Total Impaired, Interest Paid YTD	21,000	94,000
Total impaired loans including troubled debt restructurings	793,000		815,000
Residential Real Estate [Member] | Multi Family [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	1,179,000		1,135,000
Residential Real Estate [Member] | Multi Family [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	329,000		330,000
Residential Real Estate [Member] | Multi Family [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	570,182,000		576,975,000
Residential Real Estate [Member] | Home Equity [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	21,012,000		21,124,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	97,000		79,000
Total Impaired, with no Reserve, Recorded Investment	56,000		106,000
Total Impaired, Recorded Investment	153,000		185,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	97,000		79,000
Total Impaired with no Reserve, Unpaid Principal Balance	56,000		106,000
Total Impaired, Unpaid Principal Balance, Total	153,000		185,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	55,000		44,000
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	55,000		44,000
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	0		0
Total Impaired, Cumulative Charge-offs	0		0
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	98,000	83,000
Total Impaired with no Reserve, Average Recorded Investment	57,000	111,000
Total Impaired, Average Recorded Investment, Total	155,000	194,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	2,000	6,000
Total Impaired with no Reserve, Interest Paid YTD	1,000	5,000
Total Impaired, Interest Paid YTD	3,000	11,000
Total impaired loans including troubled debt restructurings			47,000
Residential Real Estate [Member] | Home Equity [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	153,000		138,000
Residential Real Estate [Member] | Home Equity [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	472,000		401,000
Residential Real Estate [Member] | Home Equity [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	20,387,000		20,585,000
Construction and Land [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	19,151,000		19,859,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	0		0
Total Impaired, with no Reserve, Recorded Investment	0		0
Total Impaired, Recorded Investment	0		0
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	0		0
Total Impaired with no Reserve, Unpaid Principal Balance	0		0
Total Impaired, Unpaid Principal Balance, Total	0		0
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	0		0
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	0		0
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	0		0
Total Impaired, Cumulative Charge-offs	0		0
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	0	0
Total Impaired with no Reserve, Average Recorded Investment	0	0
Total Impaired, Average Recorded Investment, Total	0	0
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	0	0
Total Impaired with no Reserve, Interest Paid YTD	0	0
Total Impaired, Interest Paid YTD	0	0
Construction and Land [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	0		0
Construction and Land [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	0		0
Construction and Land [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	19,151,000		19,859,000
Commercial Real Estate [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	211,476,000		195,842,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	30,000		34,000
Total Impaired, with no Reserve, Recorded Investment	150,000		506,000
Total Impaired, Recorded Investment	180,000		540,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	439,000		443,000
Total Impaired with no Reserve, Unpaid Principal Balance	150,000		506,000
Total Impaired, Unpaid Principal Balance, Total	589,000		949,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	30,000		34,000
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	30,000		34,000
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	409,000		409,000
Total Impaired with no Reserve, Cumulative Charge-offs	0		0
Total Impaired, Cumulative Charge-offs	409,000		409,000
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	32,000	43,000
Total Impaired with no Reserve, Average Recorded Investment	150,000	513,000
Total Impaired, Average Recorded Investment, Total	182,000	556,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	0	0
Total Impaired with no Reserve, Interest Paid YTD	0	19,000
Total Impaired, Interest Paid YTD	0	19,000
Total impaired loans including troubled debt restructurings	318,000		324,000
Commercial Real Estate [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	1,047,000		1,124,000
Commercial Real Estate [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	288,000		295,000
Commercial Real Estate [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	210,141,000		194,423,000
Consumer [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	240,000		255,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	0		0
Total Impaired, with no Reserve, Recorded Investment	0		0
Total Impaired, Recorded Investment	0		0
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	0		0
Total Impaired with no Reserve, Unpaid Principal Balance	0		0
Total Impaired, Unpaid Principal Balance, Total	0		0
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	0		0
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	0		0
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	0		0
Total Impaired, Cumulative Charge-offs	0		0
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	0	0
Total Impaired with no Reserve, Average Recorded Investment	0	0
Total Impaired, Average Recorded Investment, Total	0	0
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	0	0
Total Impaired with no Reserve, Interest Paid YTD	0	0
Total Impaired, Interest Paid YTD	0	0
Consumer [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	0		0
Consumer [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	0		0
Consumer [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	240,000		255,000
Commercial Loans [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	33,849,000		36,697,000
Impaired Loans Receivable, Recorded Investment [Abstract]
Total Impaired, with Reserve, Recorded Investment	0		0
Total Impaired, with no Reserve, Recorded Investment	26,000		26,000
Total Impaired, Recorded Investment	26,000		26,000
Impaired Loans Receivable, Unpaid Principal Balance [Abstract]
Total Impaired with Reserve, Unpaid Principal Balance	0		0
Total Impaired with no Reserve, Unpaid Principal Balance	26,000		26,000
Total Impaired, Unpaid Principal Balance, Total	26,000		26,000
Impaired Loans Receivable, Reserve [Abstract]
Total Impaired with Reserve, Reserve	0		0
Total Impaired with no Reserve, Reserve	0		0
Impaired Loans, Reserve	0		0
Impaired Loans Receivable, Cumulative Charge Offs [Abstract]
Total Impaired with Reserve, Cumulative Charge-offs	0		0
Total Impaired with no Reserve, Cumulative Charge-offs	0		0
Total Impaired, Cumulative Charge-offs	0		0
Impaired Loans Receivable, Average Recorded Investment [Abstract]
Total Impaired with Reserve, Average Recorded Investment	0	0
Total Impaired with no Reserve, Average Recorded Investment	26,000	26,000
Total Impaired, Average Recorded Investment, Total	26,000	26,000
Impaired Loans Receivable, Interest Paid YTD [Abstract]
Total Impaired with Reserve, Interest Paid YTD	0	0
Total Impaired with no Reserve, Interest Paid YTD	0	0
Total Impaired, Interest Paid YTD	0	$ 0
Commercial Loans [Member] | Substandard [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	1,573,000		1,585,000
Commercial Loans [Member] | Watch [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	719,000		741,000
Commercial Loans [Member] | Pass [Member]
Loans Receivable, Recorded Investment [Line Items]
At December 31, 2016	$ 31,557,000		$ 34,371,000

Loans Receivable, Part V (Detai

Loans Receivable, Part V (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)LoanPayment	Mar. 31, 2017USD ($)Loan	Dec. 31, 2017USD ($)Loan
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 4,962,000		$ 5,082,000
Total number of troubled debt restructurings | Loan	14		15
Period of principal forbearance, reduction in interest rate or both included in typical restructured terms	0 months
Valuation allowance with respect to troubled debt restructurings	$ 30,000		$ 34,000
Minimum number of consecutive contractual payments received prior to consideration for a return to accrual status | Payment	6
Troubled Debt Restructurings by Concession Type [Abstract]
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms	$ 4,932,000		$ 4,422,000
Number of loans performing in accordance with modified terms | Loan	13		13
Loans Receivable, Modifications, Loans in Default	$ 30,000		$ 660,000
Number of Loans in Default | Loan	1		2
Loans Receivable, Modifications, Total	$ 4,962,000		$ 5,082,000
Number of Loans, Total | Loan	14		15
Data on Troubled Debt Restructuring [Abstract]
Loans modified as a troubled debt restructure
Number of loans modified as a troubled debt restructuring | Loan
Non accrual Loans [Abstract]
Total non-accrual loans	$ 6,557,000		$ 6,068,000
Ratio of total non-accrual loans to total loans, net of allowance	0.50%		0.47%
Ratio of total non-accrual loans to total assets	0.36%		0.34%
Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 3,028,000		$ 3,077,000
Total number of troubled debt restructurings | Loan	3		4
Non-Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 1,934,000		$ 2,005,000
Total number of troubled debt restructurings | Loan	11		11
Interest Reduction and Principal Forbearance [Member]
Troubled Debt Restructurings by Concession Type [Abstract]
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms	$ 4,583,000		$ 4,022,000
Number of loans performing in accordance with modified terms | Loan	10		9
Loans Receivable, Modifications, Loans in Default	$ 30,000		$ 660,000
Number of Loans in Default | Loan	1		2
Loans Receivable, Modifications, Total	$ 4,613,000		$ 4,682,000
Number of Loans, Total | Loan	11		11
Interest Reduction [Member]
Troubled Debt Restructurings by Concession Type [Abstract]
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms	$ 349,000		$ 353,000
Number of loans performing in accordance with modified terms | Loan	3		3
Loans Receivable, Modifications, Loans in Default	$ 0		$ 0
Number of Loans in Default | Loan	0		0
Loans Receivable, Modifications, Total	$ 349,000		$ 353,000
Number of Loans, Total | Loan	3		3
Principal Forbearance [Member]
Troubled Debt Restructurings by Concession Type [Abstract]
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms	$ 0		$ 47,000
Number of loans performing in accordance with modified terms | Loan	0		1
Loans Receivable, Modifications, Loans in Default	$ 0		$ 0
Number of Loans in Default | Loan	0		0
Loans Receivable, Modifications, Total	$ 0		$ 47,000
Number of Loans, Total | Loan	0		1
Residential Real Estate [Member] | One-to-Four Family [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 3,851,000		$ 3,896,000
Total number of troubled debt restructurings | Loan	9		9
Non accrual Loans [Abstract]
Total non-accrual loans	$ 5,051,000		$ 4,677,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 2,740,000		$ 2,740,000
Total number of troubled debt restructurings | Loan	2		2
Residential Real Estate [Member] | One-to-Four Family [Member] | Non-Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 1,111,000		$ 1,156,000
Total number of troubled debt restructurings | Loan	7		7
Residential Real Estate [Member] | Multi Family [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 793,000		$ 815,000
Total number of troubled debt restructurings | Loan	3		3
Non accrual Loans [Abstract]
Total non-accrual loans	$ 1,178,000		$ 1,007,000
Residential Real Estate [Member] | Multi Family [Member] | Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 0		$ 0
Total number of troubled debt restructurings | Loan	0		0
Residential Real Estate [Member] | Multi Family [Member] | Non-Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 793,000		$ 815,000
Total number of troubled debt restructurings | Loan	3		3
Residential Real Estate [Member] | Home Equity [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring			$ 47,000
Total number of troubled debt restructurings | Loan			1
Non accrual Loans [Abstract]
Total non-accrual loans	$ 122,000		$ 107,000
Residential Real Estate [Member] | Home Equity [Member] | Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring			$ 47,000
Total number of troubled debt restructurings | Loan			1
Residential Real Estate [Member] | Home Equity [Member] | Non-Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring			$ 0
Total number of troubled debt restructurings | Loan			0
Construction and Land [Member]
Non accrual Loans [Abstract]
Total non-accrual loans	0		$ 0
Commercial Real Estate [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 318,000		$ 324,000
Total number of troubled debt restructurings | Loan	2		2
Non accrual Loans [Abstract]
Total non-accrual loans	$ 180,000		$ 251,000
Commercial Real Estate [Member] | Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 288,000		$ 290,000
Total number of troubled debt restructurings | Loan	1		1
Commercial Real Estate [Member] | Non-Accruing [Member]
Troubled Debt Restructuring Note, Debtor [Abstract]
Amount of troubled debt restructuring	$ 30,000		$ 34,000
Total number of troubled debt restructurings | Loan	1		1
Consumer [Member]
Non accrual Loans [Abstract]
Total non-accrual loans	$ 0		$ 0
Commercial Loans [Member]
Non accrual Loans [Abstract]
Total non-accrual loans	$ 26,000		$ 26,000

Real Estate Owned (Details)

Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Line Items]
Real estate owned, net	$ 3,374	$ 5,070	$ 4,558	$ 6,118
Transferred from loans receivable	238	416
Sales	(1,165)	(1,009)
Write downs	(257)	(455)
Other	0	$ 0
Mortgage loans in process of foreclosure	2,100		2,300
One-to-Four Family [Member]
Real Estate [Line Items]
Real estate owned, net	1,062		1,330
Multi Family [Member]
Real Estate [Line Items]
Real estate owned, net	0		0
Construction and Land [Member]
Real Estate [Line Items]
Real estate owned, net	3,663		4,582
Commercial Real Estate [Member]
Real Estate [Line Items]
Real estate owned, net	300		300
Real Estate Owned Prior To Valuation Allowance [Member]
Real Estate [Line Items]
Real estate owned, net	5,025		6,212
Valuation Allowance, Real Estate Owned [Member]
Real Estate [Line Items]
Valuation allowance at end of period	$ (1,651)		$ (1,654)

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Mortgage servicing rights [Roll Forward]
Mortgage servicing rights at beginning of the period	$ 888	$ 2,260
Additions	100	314
Amortization	(49)	(19)
Sales	0	(2,264)
Mortgage servicing rights at end of the period	939	291
Valuation allowance at end of period			$ 0		$ 0
Mortgage servicing rights at end of the period, net	888	2,260	939	$ 888	291
Estimated future servicing rights amortization expense by period [Abstract]
2,017			102
2,018			120
2,019			111
2,020			101
2,021			92
Thereafter			413
Total			939
MSR Sales [Abstract]
Loans originated for sale	489,200	481,300
Sales of loans held for sale	532,100	608,500
Generated mortgage banking income	24,200	24,700
Loans sold on a servicing retained basis			$ 134,300	$ 126,300	$ 40,200
Sold mortgage servicing rights	0	2,264
Sales Of Mortgage Servicing Rights	0
Mortgage servicing rights book value	0	2,300
Mortgage servicing rights sold	0	2,600
Gain on sale of MSR	$ 0	$ 308,000

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time deposits, greater than $250,000	$ 51,300	$ 45,900
Summary of the contractual maturities of time deposits [Abstract]
Within one year	522,568
More than one to two years	155,048
More than two to three years	15,534
More than three to four years	1,129
More than four through five years	2,919
Time deposits	$ 697,198	$ 688,979

Borrowings (Details)

Borrowings (Details) $ in Thousands	Mar. 31, 2018USD ($)Agreement	Dec. 31, 2017USD ($)Agreement
Debt Instrument [Line Items]
Short-term repurchase agreements, outstanding	$ 19,300
Short Term Repurchase Agreements, commitment	35,000
Long-term borrowings	$ 434,365	$ 386,285
Percentage of carrying value of qualifying of one-to-four family loans	77.00%	77.00%
Percentage of carrying value of qualifying home equity loans	64.00%	65.00%
Percentage of carrying value of qualifying of multi-family loans	75.00%	75.00%
FHLBC stock as collateral	$ 18,700	$ 16,900
Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Short-term borrowings	$ 10,000	$ 35,000
Weighted average rate	1.80%	1.28%
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Short-term borrowings	$ 19,365	$ 11,285
Weighted average rate	4.63%	4.32%
Short Term Debt Maturing in 2018 [Member] | Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Short-term borrowings	$ 50,000	$ 65,000
Weighted average rate	3.04%	2.97%
Long Term Debt Maturing 2027 [Member] | Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 175,000	$ 175,000
Weighted average rate	1.38%	1.38%
Long Term Debt Maturing 2028 [Member] | Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 80,000	$ 0
Weighted average rate	2.24%	0.00%
Long Term Debt Maturing 06/2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 50,000	$ 50,000
FHLB, year of maturity	2,021	2,021
Number of federal home loan bank advances | Agreement	2	2
Long Term Debt Maturing 06/2021 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	0.67%	0.67%
Long Term Debt Maturing 06/2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	0.73%	0.73%
Long Term Debt Maturing 06/2021 [Member] | Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 100,000	$ 100,000
Weighted average rate	0.78%	0.78%
Long Term Debt Maturing 05/2027 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 50,000	$ 50,000
FHLB, year of maturity	2,027	2,027
Number of federal home loan bank advances | Agreement	1	1
Long Term Debt Maturing 05/2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.24%	1.24%
Long Term Debt Maturing 05/2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	1.24%	1.24%
Long Term Debt Maturing 05/2027 [Member] | Federal Home Loan Bank, Chicago Advances [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 434,365	$ 386,285
Weighted average rate	1.61%	1.57%
Long Term Debt Maturing 03/28/2028 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 25,000
FHLB, year of maturity	2,028
Number of federal home loan bank advances | Agreement	1
Long Term Debt Maturing 03/28/2028 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	2.16%
Long Term Debt Maturing 03/28/2028 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	2.16%
Long Term Debt Maturing 09/2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 50,000	$ 50,000
FHLB, year of maturity	2,021	2,021
Number of federal home loan bank advances | Agreement	1	1
Long Term Debt Maturing 09/2021 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	0.85%	0.85%
Long Term Debt Maturing 09/2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	0.85%	0.85%
Long Term Debt Maturing 06/2027 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 50,000	$ 50,000
FHLB, year of maturity	2,027	2,027
Number of federal home loan bank advances | Agreement	1	1
Long Term Debt Maturing 06/2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.23%	1.23%
Long Term Debt Maturing 06/2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	1.23%	1.23%
Long Term Debt Maturing 08/2027 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 25,000	$ 25,000
FHLB, year of maturity	2,027	2,027
Number of federal home loan bank advances | Agreement	1	1
Long Term Debt Maturing 08/2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.23%	1.23%
Long Term Debt Maturing 08/2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	1.23%	1.23%
Long Term Debt Maturing 12/2027 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 50,000	$ 50,000
FHLB, year of maturity	2,027	2,027
Number of federal home loan bank advances | Agreement	1	1
Long Term Debt Maturing 12/2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.73%	1.73%
Long Term Debt Maturing 12/2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	1.73%	1.73%
Long Term Debt Maturing 03/06/2028 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 55,000
FHLB, year of maturity	2,028
Number of federal home loan bank advances | Agreement	2
Long Term Debt Maturing 03/06/2028 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	2.27%
Long Term Debt Maturing 03/06/2028 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	2.27%

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets)	$ 412,639	$ 426,057
Tier I capital (to risk-weighted assets)		411,980
Common Equity Tier 1 Capital (to risk-weighted assets)	399,449	411,980
Tier I capital (to average assets)	$ 399,449	$ 411,980
Total capital (to risk-weighted assets) Ratio	29.96%	30.75%
Tier I capital (to risk-weighted assets) Ratio		29.74%
Common Equity Tier 1 capital (to risk-weighted assets) Ratio	29.00%	29.74%
Tier I capital (to average assets) Ratio	22.31%	22.43%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes	$ 110,202	$ 110,829
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes		83,122
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes	61,988	62,341
Tier I capital (to average assets), For Capital Adequacy Purposes	$ 71,612	$ 73,481
Total capital (to risk-weighted assets), For Capital Adequacy Ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), For Capital Adequacy Ratio		6.00%
Common Equity Tier I capital ( to risk-weighted), For Capital Adequacy Ratio	4.50%	4.50%
Tier I capital (to average assets), For Capital Adequacy Ratio	4.00%	4.00%
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer	$ 136,030	$ 128,146
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer		100,439
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer	$ 87,817	$ 79,658
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio	9.875%	9.25%
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio		7.25%
Common Equity Tier I capital (to risk weighted), Minimum Capital Adequacy with Capital Buffer Ratio	6.375%	5.75%
Waterstone Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets)	$ 383,288	$ 400,792
Tier I capital (to risk-weighted assets)	370,098	386,715
Common Equity Tier 1 Capital (to risk-weighted assets)	370,098	386,715
Tier I capital (to average assets)	370,098	386,715
State of Wisconsin (to total assets)	$ 370,098	$ 386,715
Total capital (to risk-weighted assets) Ratio	27.85%	28.93%
Tier I capital (to risk-weighted assets) Ratio	26.89%	27.92%
Common Equity Tier 1 capital (to risk-weighted assets) Ratio	26.89%	27.92%
Tier I capital (to average assets) Ratio	20.67%	21.10%
State of Wisconsin (to total assets) Ratio	20.17%	21.44%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes	$ 110,096	$ 110,812
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes	82,572	83,109
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes	61,929	62,332
Tier I capital (to average assets), For Capital Adequacy Purposes	71,612	73,304
State of Wisconsin (to total assets), For Capital Adequacy Purposes	$ 110,101	$ 108,243
Total capital (to risk-weighted assets), For Capital Adequacy Ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), For Capital Adequacy Ratio	6.00%	6.00%
Common Equity Tier I capital ( to risk-weighted), For Capital Adequacy Ratio	4.50%	4.50%
Tier I capital (to average assets), For Capital Adequacy Ratio	4.00%	4.00%
State of Wisconsin (to total assets), For Capital Adequacy Ratio	6.00%	6.00%
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer	$ 135,899	$ 128,127
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer	108,375	100,424
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer	$ 87,732	$ 79,646
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio	9.875%	9.25%
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio	7.875%	7.25%
Common Equity Tier I capital (to risk weighted), Minimum Capital Adequacy with Capital Buffer Ratio	6.375%	5.75%
Total capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	$ 137,619	$ 138,515
Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	110,096	110,812
Common Equity Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	89,453	90,035
Tier I capital (to average assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	$ 89,516	$ 91,630
Total capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Common Equity Tier I capital (to risk-weighted) , To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier I capital (to average assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%
Consolidated Waterstone Financial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier I capital (to risk-weighted assets)	$ 399,449
Tier I capital (to risk-weighted assets) Ratio	29.00%
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes	$ 82,651
Tier I capital (to risk-weighted assets), For Capital Adequacy Ratio	6.00%
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer	$ 108,480
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio	7.875%

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Taxes [Abstract]
Income tax expense	$ 2,104	$ 3,413
Income before income taxes	$ 9,057	$ 9,985
Effective tax rate	23.20%	34.20%

Offsetting of Assets and Liab52

Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Liabilities subject to netting agreement [Line Items]
Long term repurchase agreements	$ 434,365	$ 386,285
Net Amount [Member]
Schedule of Liabilities subject to netting agreement [Line Items]
Short-term repurchase Agreements	0	0
Long term repurchase agreements	0	0
Repurchase Agreement	0	0
Gross Recognized Liabilities [Member]
Schedule of Liabilities subject to netting agreement [Line Items]
Short-term repurchase Agreements	19,365	11,285
Long term repurchase agreements	0	0
Repurchase Agreement	19,365	11,285
Gross Amounts Offset [Member]
Schedule of Liabilities subject to netting agreement [Line Items]
Short-term repurchase Agreements	0	0
Long term repurchase agreements	0	0
Repurchase Agreement	0	0
Net Amounts Presented [Member]
Schedule of Liabilities subject to netting agreement [Line Items]
Short-term repurchase Agreements	19,365	11,285
Long term repurchase agreements	0	0
Repurchase Agreement	19,365	11,285
Gross Amounts Not Offset [Member]
Schedule of Liabilities subject to netting agreement [Line Items]
Short-term repurchase Agreements	19,365	11,285
Long term repurchase agreements	0	0
Repurchase Agreement	$ 19,365	$ 11,285

Commitments, Off-Balance Shee53

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period of home equity loans available to the borrower		10 years
Maximum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period of commitments for loans extended to customers		90 days
Period of construction loans available to the borrower		1 year
Commitments to Extend Credit Under Amortizing Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks asset amount	[1]	$ 53,445	$ 31,543
Probable losses		0	0
Commitments to Extend Credit Under Home Equity Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks asset amount	[2]	15,080	14,972
Probable losses		0	0
Unused Portion of Construction Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks asset amount	[3]	24,194	17,097
Unused Portion of Business Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks asset amount		16,078	16,878
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks liability amount		267	259
Probable losses		$ 0	$ 0
[1]	Commitments for loans are extended to customers for up to 90 days after which they expire. Excludes commitments to originate loans held for sale, which are discussed in the following footnote.
[2]	Unused portions of home equity loans are available to the borrower for up to 10 years.
[3]	Unused portions of construction loans are available to the borrower for up to one year.

Derivative Financial Instrume54

Derivative Financial Instruments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Forward Commitments to Sell Mortgage Loans [Member]
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 377
Gain reported as a component of other assets	318,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Aggregate notional amount of derivatives	296.4
Gain reported as a component of other assets	$ 3.3

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic and Diluted Earnings Per Share Calculations [Abstract]
Net income (loss)	$ 6,953	$ 6,572
Weighted average shares outstanding (in shares)	27,509	27,323
Effect of dilutive potential common shares (in shares)	293	544
Diluted weighted average shares outstanding (in shares)	27,802	27,867
Basic earnings per share (in dollars per share)	$ 0.25	$ 0.24
Diluted earnings per share (in dollars per share)	$ 0.25	$ 0.24

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Assets and Liabilities Measured On Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Available-for-Sale Securities [Abstract]
Loans held for sale		$ 127,638	$ 149,896
Recurring [Member]
Available-for-Sale Securities [Abstract]
Mortgage-backed securities		52,583	57,435
Collateralized mortgage obligations, Government sponsored enterprise issued		56,670	60,500
Government sponsored enterprise bonds		498	2,497
Municipal securities		62,783	63,769
Other debt securities		13,714	14,525
Certificates of deposit		735	981
Loans held for sale		127,638	149,896
Mortgage banking derivative assets		3,299	2,004
Mortgage banking derivatives liabilities		318	0
Recurring [Member] | Level 1 [Member]
Available-for-Sale Securities [Abstract]
Mortgage-backed securities		0	0
Collateralized mortgage obligations, Government sponsored enterprise issued		0	0
Government sponsored enterprise bonds		0	0
Municipal securities		0	0
Other debt securities		0	0
Certificates of deposit		0	0
Loans held for sale		0	0
Mortgage banking derivative assets		0	0
Mortgage banking derivatives liabilities		0	0
Recurring [Member] | Level 2 [Member]
Available-for-Sale Securities [Abstract]
Mortgage-backed securities		52,583	57,435
Collateralized mortgage obligations, Government sponsored enterprise issued		56,670	60,500
Government sponsored enterprise bonds		498	2,497
Municipal securities		62,783	63,769
Other debt securities		13,714	14,525
Certificates of deposit		735	981
Loans held for sale		127,638	149,896
Mortgage banking derivative assets		0	0
Mortgage banking derivatives liabilities		0	0
Recurring [Member] | Level 3 [Member]
Available-for-Sale Securities [Abstract]
Mortgage-backed securities		0	0
Collateralized mortgage obligations, Government sponsored enterprise issued		0	0
Government sponsored enterprise bonds		0	0
Municipal securities		0	0
Other debt securities		0	0
Certificates of deposit		0	0
Loans held for sale		0	0
Mortgage banking derivative assets		3,299	2,004
Mortgage banking derivatives liabilities		318	0
Non-Recurring [Member]
Available-for-Sale Securities [Abstract]
Impaired loans, net	[1]	694	861
Real estate owned		3,374	4,558
Mortgage Servicing Rights		1,350	1,125
Non-Recurring [Member] | Level 1 [Member]
Available-for-Sale Securities [Abstract]
Impaired loans, net	[1]	0	0
Real estate owned		0	0
Mortgage Servicing Rights		0	0
Non-Recurring [Member] | Level 2 [Member]
Available-for-Sale Securities [Abstract]
Impaired loans, net	[1]	0	0
Real estate owned		0	0
Mortgage Servicing Rights		0	0
Non-Recurring [Member] | Level 3 [Member]
Available-for-Sale Securities [Abstract]
Impaired loans, net	[1]	694	861
Real estate owned		3,374	4,558
Mortgage Servicing Rights		$ 1,350	$ 1,125
[1]	Represents collateral-dependent impaired loans, net, which are included in loans.

Fair Value Measurements, Fair57

Fair Value Measurements, Fair Value of Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Mortgage Banking Derivatives, Net [Member] - Recurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Assets measured on recurring basis, unobservable input reconciliation [Roll Forward]
Beginning balance	$ 2,004	$ 3,334
Mortgage derivative gain, net	977	(1,330)
Ending balance	$ 2,981	$ 2,004

Fair Value Measurements, Balanc

Fair Value Measurements, Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Assets [Abstract]
Securities available-for-sale	$ 186,983	$ 199,707
Loans held for sale	127,638	149,896
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and cash equivalents	83,407	48,607
Securities available-for-sale	186,983	199,707
Loans held for sale	127,638	149,896
Loans receivable	1,314,672	1,291,814
FHLB stock	18,675	16,875
Accrued interest receivable	5,197	4,924
Mortgage servicing rights	939	888
Mortgage banking derivative assets	3,299	2,004
Financial Liabilities [Abstract]
Deposits	974,224	967,380
Advance payments by borrowers for taxes	12,004	4,876
Borrowings	434,365	386,285
Accrued interest payable	904	886
Mortgage banking derivative liabilities	318	0
Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	83,407	48,607
Securities available-for-sale	186,983	199,707
Loans held for sale	127,638	149,896
Loans receivable	1,287,014	1,291,142
FHLB stock	18,675	16,875
Accrued interest receivable	5,197	4,924
Mortgage servicing rights	1,350	1,125
Mortgage banking derivative assets	3,299	2,004
Financial Liabilities [Abstract]
Deposits	973,730	967,558
Advance payments by borrowers for taxes	12,004	4,876
Borrowings	431,172	384,348
Accrued interest payable	904	886
Mortgage banking derivative liabilities	318	0
Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	80,407	39,607
Securities available-for-sale	0	0
Loans held for sale	0	0
Loans receivable	0	0
FHLB stock	0	0
Accrued interest receivable	5,197	4,924
Mortgage servicing rights	0	0
Mortgage banking derivative assets	0	0
Financial Liabilities [Abstract]
Deposits	277,026	278,401
Advance payments by borrowers for taxes	12,004	4,876
Borrowings	0	0
Accrued interest payable	904	886
Mortgage banking derivative liabilities	0	0
Fair Value [Member] | Level 2 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,000	9,000
Securities available-for-sale	186,983	199,707
Loans held for sale	127,638	149,896
Loans receivable	0	0
FHLB stock	18,675	16,875
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Mortgage banking derivative assets	0	0
Financial Liabilities [Abstract]
Deposits	696,704	689,157
Advance payments by borrowers for taxes	0	0
Borrowings	431,172	384,348
Accrued interest payable	0	0
Mortgage banking derivative liabilities	0	0
Fair Value [Member] | Level 3 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Loans held for sale	0	0
Loans receivable	1,287,014	1,291,142
FHLB stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	1,350	1,125
Mortgage banking derivative assets	3,299	2,004
Financial Liabilities [Abstract]
Deposits	0	0
Advance payments by borrowers for taxes	0	0
Borrowings	0	0
Accrued interest payable	0	0
Mortgage banking derivative liabilities	$ 318	$ 0

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)Segment	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Segment Reporting Information [Line Items]
Net interest income	$ 13,141	$ 11,895
Provision for loan losses	(880)	(1,211)
Net interest income (loss) after provision for loan losses	14,021	13,106
Noninterest income	25,183	25,937
Noninterest expenses [Abstract]
Compensation, payroll taxes, and other employee benefits	20,983	19,995
Occupancy, office furniture and equipment	2,639	2,527
FDIC insurance premiums	125	120
Real estate owned	317	411
Other	3,516	3,697
Total noninterest expenses	30,147	29,058
Income (loss) before income taxes	9,057	9,985
Income tax expense	2,104	3,413
Net income (loss)	6,953	6,572
Total assets	1,839,264	1,727,173	$ 1,806,401
Holding Company and Other [Member]
Segment Reporting Information [Line Items]
Net interest income	29	115
Provision for loan losses	0	0
Net interest income (loss) after provision for loan losses	29	115
Noninterest income	(487)	(260)
Noninterest expenses [Abstract]
Compensation, payroll taxes, and other employee benefits	(146)	(122)
Occupancy, office furniture and equipment	0	0
FDIC insurance premiums	0	0
Real estate owned	0	0
Other	(330)	(113)
Total noninterest expenses	(476)	(235)
Income (loss) before income taxes	18	90
Income tax expense	1	20
Net income (loss)	17	70
Total assets	(138,572)	(163,430)
Operating Segments [Member]
Noninterest expenses [Abstract]
Other	6,083	6,005
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	13,304	11,680
Provision for loan losses	(900)	(1,300)
Net interest income (loss) after provision for loan losses	14,204	12,980
Noninterest income	939	812
Noninterest expenses [Abstract]
Compensation, payroll taxes, and other employee benefits	4,888	4,328
Occupancy, office furniture and equipment	826	841
FDIC insurance premiums	125	120
Real estate owned	317	411
Other	1,526	1,257
Total noninterest expenses	7,682	6,957
Income (loss) before income taxes	7,461	6,835
Income tax expense	1,668	2,159
Net income (loss)	5,793	4,676
Total assets	1,819,569	1,735,619
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	(192)	100
Provision for loan losses	20	89
Net interest income (loss) after provision for loan losses	(212)	11
Noninterest income	24,731	25,385
Noninterest expenses [Abstract]
Compensation, payroll taxes, and other employee benefits	16,241	15,789
Occupancy, office furniture and equipment	1,813	1,686
FDIC insurance premiums	0	0
Real estate owned	0	0
Other	4,887	4,861
Total noninterest expenses	22,941	22,336
Income (loss) before income taxes	1,578	3,060
Income tax expense	435	1,234
Net income (loss)	1,143	1,826
Total assets	$ 158,267	$ 154,984