BankFinancial (BFIN) 10-Q 26 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 24, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,017
Entity Registrant Name	BankFinancial CORP
Entity Central Index Key	1,303,942
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,177,790
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and due from other financial institutions	$ 9,835	$ 13,053
Interest-bearing deposits in other financial institutions	71,771	83,631
Cash and cash equivalents	81,606	96,684
Securities, at fair value	109,762	107,212
Loans receivable, net of allowance for loan losses: September 30, 2016, $8,334 and December 31, 2015, $9,691	1,335,835	1,312,952
Other Real Estate Owned At Carrying Value	4,896	3,895
Stock in Federal Home Loan Bank, at cost	8,290	11,650
Premises and equipment, net	30,889	31,413
Accrued interest receivable	4,488	4,381
Core deposit intangible	531	782
Bank owned life insurance	22,723	22,594
Deferred Tax Assets, Net, Current	20,676	22,411
Other assets	3,722	6,063
Total assets	1,623,418	1,620,037
Deposits
Noninterest-bearing	229,921	249,539
Interest-bearing	1,117,966	1,089,851
Total deposits	1,347,887	1,339,390
Borrowings	50,877	51,069
Advance payments by borrowers taxes and insurance	13,693	11,041
Accrued interest payable and other liabilities	10,899	13,757
Total liabilities	1,423,356	1,415,257
Commitments and contingent liabilities
Stockholders' equity:
Preferred Stock, $0.01 par value, 25,000,000 shares authorized, none issued or outstanding	0	0
Common Stock, $0.01 par value, 100,000,000 shares authorized; 19,271,211 shares issued at September 30, 2016 and 20,297,317 issued at December 31, 2015	182	192
Additional paid-in capital	158,060	173,047
Retained earnings (deficit)	41,496	39,483
Unearned Employee Stock Ownership Plan shares	0	(8,318)
Accumulated other comprehensive income	324	376
Total stockholders' equity	200,062	204,780
Total liabilities and stockholders' equity	$ 1,623,418	$ 1,620,037

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 8,122	$ 8,127
Preferred Stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized	25,000,000	25,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value (usd per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	19,271,211	20,297,317

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Interest and dividend income
Loans, including fees	$ 12,956	$ 12,099
Securities	357	307
Other	336	175
Total interest income	13,649	12,581
Interest expense
Deposits	1,304	950
Borrowings	152	2
Total interest expense	1,456	952
Net interest income	12,193	11,629
Provision for (recovery of) loan losses	49	1,315
Net interest income	12,144	10,314
Noninterest income
Deposit service charges and fees	569	541
Other fee income	490	505
Insurance commissions and annuities income	52	72
Gain on sale of loans, net	53	3
Loan servicing fees	62	75
Amortization and impairment of servicing assets	(28)	(37)
Bank Owned Life Insurance Income	66	46
Trust	193	165
Other	150	167
Total noninterest income	1,607	1,537
Noninterest expense
Compensation and benefits	5,110	5,713
Office occupancy and equipment	1,599	1,635
Advertising and public relations	259	252
Information technology	679	699
Supplies, telephone, and postage	358	297
Amortization of intangibles	122	129
Nonperforming asset management	27	127
Operations of other real estate owned	245	149
FDIC insurance premiums	125	236
Other	1,083	1,269
Total noninterest expense	9,607	10,506
Income before income taxes	4,144	1,345
Income tax expense	1,572	514
Net income	$ 2,572	$ 831
Basic earnings per common share (usd per share)	$ 0.14	$ 0.04
Diluted earnings per common share (usd per share)	$ 0.14	$ 0.04
Weighted average common shares outstanding (shares)	18,330,032	19,130,118
Diluted weighted average common shares outstanding (shares)	18,330,455	19,130,435

Consolidated Statements Compreh

Consolidated Statements Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 2,572	$ 831	$ 4,453	$ 2,735
Unrealized holding gain (loss) arising during the period	63	40	83	62
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	24	16	31	24
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(39)	(24)	(52)	(38)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	0	0	(46)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	0	0	18
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities	0	0	0	(28)
Other Comprehensive Income (Loss), Net of Tax	(39)	(24)	(52)	(66)
Comprehensive income (loss)	$ 2,533	$ 807	$ 4,401	$ 2,669

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Unearned Employee Stock Ownership Plan Shares	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2015	$ 212,364	$ 203	$ 184,797	$ 36,114	$ (9,297)	$ 547
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,735			2,735
Other comprehensive income, net of tax effects	(66)					(66)
Proceeds from Repayment of Loans by Employee Stock Ownership Plans	0
Payments for Repurchase of Common Stock	(7,673)	6	7,667
Nonvested stock awards-stock-based compensation expense	768		768	0	0	0
Cash dividends declared on common stock (2015: $0.16, 2016: $0.15, per share)	2,004			2,004
ESOP shares earned	583		97	0	486
Ending Balance at Jun. 30, 2016	206,707	197	177,995	36,845	(8,811)	481
Beginning Balance at Dec. 31, 2016	204,780	192	173,047	39,483	(8,318)	376
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,453			4,453
Other comprehensive income, net of tax effects	(52)					(52)
Proceeds from Stock Options Exercised	(1,237)	(2)	1,239
Proceeds from Repayment of Loans by Employee Stock Ownership Plans	1,125	(8)	(7,185)		8,318
Payments for Repurchase of Common Stock	(6,567)	4	6,563
Cash dividends declared on common stock (2015: $0.16, 2016: $0.15, per share)	2,440			2,440
Ending Balance at Jun. 30, 2017	$ 200,062	$ 182	$ 158,060	$ 41,496	$ 0	$ 324

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Common Stock, Dividends, Per Share, Declared	$ 0.15	$ 0.16
Stock Repurchased and Retired During Period, Shares	448,436	600,000,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 4,453	$ 2,735
Adjustments to reconcile to net loss to net cash from operating activities
Provision for (recovery of) loan losses	210	825
Proceeds from Repayment of Loans by Employee Stock Ownership Plans	1,125	0
ESOP shares earned	0	583
Stock-based compensation expense	0	768
Depreciation and amortization	1,890	1,872
Amortization of premiums and discounts on securities and loans	(91)	(77)
Amortization Of Intangibles	251	265
Amortization and impairment of servicing assets	59	68
Net change in net deferred loan origination costs	183	(37)
Net loss on sale of other real estate owned	31	0
Net gain on sale of loans	(60)	(21)
Loans originated for sale	(1,016)	(503)
Proceeds from sale of loans	1,076	524
REO valuation adjustments	74	129
Net change in:
Accrued interest receivable	(107)	226
Earnings on bank owned life insurance	(129)	(97)
Other assets	3,317	1,955
Accrued interest payable and other liabilities	(2,858)	(682)
Net cash from operating activities	8,408	8,487
Gain on Sale of Securities, Net	0	(46)
Securities
Proceeds from maturities	29,275	38,523
Proceeds from principal repayments	1,732	2,263
Proceeds from Sale of Available-for-sale Securities	0	46
Purchases of securities	(33,648)	(31,857)
Loans receivable
Increase (Decrease) in Participation Liabilities	3,615	0
Principal payments on loans receivable	295,864	249,183
Payments to Purchase Loans Held-for-sale	(20,406)	0
Proceeds from Sale of Loans Receivable	0	14,746
Originated for investment	(304,332)	(240,574)
Payments for (Proceeds from) Federal Home Loan Bank Stock	3,514	0
Payments to Acquire Federal Home Loan Bank Stock	154	0
Proceeds from sale of other real estate owned	830	1,630
Purchases of premises and equipment, net	(507)	(317)
Net cash from (used in) investing activities	(24,217)	33,643
Cash flows from financing activities
Net change in deposits	8,497	55,683
Net change in borrowings	(192)	(62,849)
Net change in advance payments by borrowers for taxes and insurance	2,652	893
Payments for Repurchase of Common Stock	(6,567)	(7,673)
Payments of Ordinary Dividends, Common Stock	(2,440)	(2,004)
Payments for Deposits Applied to Debt Retirements	1,219	0
Net cash used in financing activities	731	(15,950)
Net change in cash and cash equivalents	(15,078)	26,180
Beginning cash and cash equivalents	96,684	59,377
Ending cash and cash equivalents	81,606	85,557
Supplemental disclosures of cash flow information:
Interest paid	2,668	1,710
Income taxes paid	176	175
Loans transferred to other real estate owned	$ 1,936	$ 121

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation : BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, National Association (the “Bank”). The interim unaudited consolidated financial statements include the accounts of and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BF Asset Recovery Corporation (collectively, “the Company”), and reflect all normal and recurring adjustments that are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three- and six -month periods ended June 30, 2017 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2017 . Certain information and note disclosures normally included in financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Use of Estimates : To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and future results could differ. Reclassifications : Certain reclassifications have been made in the prior period’s financial statements to conform them to the current period’s presentation. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , as filed with the Securities and Exchange Commission. Recent Accounti

Earnings Per Share (Notes)

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	ngs per share reflect earnings available to common stockholders for the period divided by the weighted average number of shares of common stock outstanding during the period, exclusive of unearned ESOP shares and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock. Three Months Ended Six Months Ended 2017 2016 2017 2016 Net income available to common stockholders $ 2,572 $ 831 $ 4,453 $ 2,735 Average common shares outstanding 18,330,972 19,827,581 18,784,934 19,991,561 Less: Unearned ESOP shares — (694,773 ) (298,813 ) (706,941 ) Unvested restricted stock shares (940 ) (2,690 ) (940 ) (5,290 ) Weighted average common shares outstanding 18,330,032 19,130,118 18,485,181 19,279,330 Add - Net effect of dilutive unvested restricted stock 423 317 416 312 Diluted weighted average common shares outstanding 18,330,455 19,130,435 18,485,597 19,279,642 Basic earnings per common share $ 0.14 $ 0.04 $ 0.24 $ 0.14 Diluted earnings per common share $ 0.14 $ 0.04 $ 0.24 $ 0.14 Number of antidilutive stock options excluded from the diluted earnings per share calculation — 536,459 — 536,459 Weighted average exercise price of anti-dilutive option shares $ — $ 12.99 $ — $ 12.99

Securities (Notes)

Securities (Notes)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
SECURITIES	The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value June 30, 2017 Certificates of deposit $ 90,619 $ — $ — $ 90,619 Equity mutual fund 500 1 — 501 Mortgage-backed securities - residential 13,095 553 (19 ) 13,629 Collateralized mortgage obligations - residential 5,008 13 (22 ) 4,999 SBA-guaranteed loan participation certificates 14 — — 14 $ 109,236 $ 567 $ (41 ) $ 109,762 December 31, 2016 Certificates of deposit $ 85,938 $ — $ — $ 85,938 Equity mutual fund 500 — (1 ) 499 Mortgage-backed securities - residential 14,561 644 (21 ) 15,184 Collateralized mortgage obligations - residential 5,587 15 (28 ) 5,574 SBA-guaranteed loan participation certificates 17 — — 17 $ 106,603 $ 659 $ (50 ) $ 107,212 The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at June 30, 2017 and December 31, 2016 . The amortized cost and fair values of securities by contractual maturity are shown below. Securities not due at a single maturity date are shown separately. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2017 Amortized Cost Fair Value Due in one year or less $ 90,619 $ 90,619 Equity mutual fund 500 501 Mortgage-backed securities - residential 13,095 13,629 Collateralized mortgage obligations - residential 5,008 4,999 SBA-guaranteed loan participation certificates 14 14 $ 109,236 $ 109,762 Sales of securities were as follows: Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds $ — $ — $ — $ 46 Gross gains — — — 46 Securities with unrealized losses not recognized in income are as follows: Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 30, 2017 Mortgage-backed securities - residential $ 1,167 $ (19 ) $ — $ — $ 1,167 $ (19 ) Collateralized mortgage obligations - residential — — 3,490 (22 ) 3,490 (22 ) $ 1,167 $ (19 ) $ 3,490 $ (22 ) $ 4,657 $ (41 ) December 31, 2016 Equity Mutual Fund $ 499 $ (1 ) $ — $ — $ 499 $ (1 ) Mortgage-backed securities - residential 1,187 (21 ) — — 1,187 (21 ) Collateralized mortgage obligations - residential 3,691 (18 ) 1,028 (10 ) 4,719 (28 ) $ 5,377 $ (40 ) $ 1,028 $ (10 ) $ 6,405 $ (50 ) The Company evaluates marketable investment securities with significant declines in fair value on a quarterly basis to determine whether they should be considered other-than-temporarily impaired under current accounting guidance, which generally provides that if a marketable security is in an unrealized loss position, whether due to general market conditions or industry or issuer-specific factors, the holder of the securities must assess whether the impairment is other-than-temporary. Certain mortgage-backed securities and collateralized mortgage obligations that the Company holds in its investment portfolio were in an unrealized loss position at June 30, 2017 , but the unrealized losses were not considered significant under the Company’s impairment testing methodology. In addition, the Company does not intend to sell these securities, and it is likely that the Company will not be required to sell these securities before their anticipated recovery occurs.

Loans Receivable (Notes)

Loans Receivable (Notes)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans receivable are as follows: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ 115,659 $ 135,218 Multi-family mortgage 555,691 542,887 Nonresidential real estate 177,436 182,152 Construction and land 2,265 1,302 Commercial loans 129,200 103,063 Commercial leases 360,397 352,539 Consumer 1,829 2,255 1,342,477 1,319,416 Net deferred loan origination costs 1,480 1,663 Allowance for loan losses (8,122 ) (8,127 ) Loans, net $ 1,335,835 $ 1,312,952 The following tables present the balance in the allowance for loan losses and the loans receivable by portfolio segment and based on impairment method: Allowance for loan losses Loan Balances Individually evaluated for impairment Collectively evaluated for impairment Total Individually evaluated for impairment Collectively evaluated for impairment Total June 30, 2017 One-to-four family residential real estate $ — $ 912 $ 912 $ 4,745 $ 110,914 $ 115,659 Multi-family mortgage — 3,668 3,668 965 554,726 555,691 Nonresidential real estate — 1,631 1,631 — 177,436 177,436 Construction and land — 54 54 — 2,265 2,265 Commercial loans — 1,012 1,012 — 129,200 129,200 Commercial leases — 830 830 — 360,397 360,397 Consumer — 15 15 — 1,829 1,829 $ — $ 8,122 $ 8,122 $ 5,710 $ 1,336,767 1,342,477 Net deferred loan origination costs 1,480 Allowance for loan losses (8,122 ) Loans, net $ 1,335,835 Allowance for loan losses Loan Balances Individually evaluated for impairment Collectively evaluated for impairment Total Individually evaluated for impairment Collectively evaluated for impairment Total December 31, 2016 One-to-four family residential real estate $ — $ 1,168 $ 1,168 $ 4,962 $ 130,256 $ 135,218 Multi-family mortgage — 3,647 3,647 787 542,100 542,887 Nonresidential real estate 26 1,768 1,794 260 181,892 182,152 Construction and land — 32 32 — 1,302 1,302 Commercial loans — 733 733 — 103,063 103,063 Commercial leases — 714 714 — 352,539 352,539 Consumer — 39 39 — 2,255 2,255 $ 26 $ 8,101 $ 8,127 $ 6,009 $ 1,313,407 1,319,416 Net deferred loan origination costs 1,663 Allowance for loan losses (8,127 ) Loans, net $ 1,312,952 Activity in the allowance for loan losses is as follows: Three Months Ended Six Months Ended 2017 2016 2017 2016 Beginning balance $ 7,971 $ 9,416 $ 8,127 $ 9,691 Loans charged off: One-to-four family residential real estate (22 ) (355 ) (193 ) (407 ) Multi-family mortgage — (6 ) (3 ) (51 ) Nonresidential real estate — (1,657 ) (165 ) (1,660 ) Consumer — (2 ) — (18 ) (22 ) (2,020 ) (361 ) (2,136 ) Recoveries: One-to-four family residential real estate 79 6 85 87 Multi-family mortgage 40 9 51 146 Nonresidential real estate — 161 — 161 Construction and land — — — 35 Commercial loans 5 28 10 105 Consumer — — — 1 124 204 146 535 Net recoveries (charge-offs) 102 (1,816 ) (215 ) (1,601 ) Provision for loan losses 49 1,315 210 825 Ending balance $ 8,122 $ 8,915 $ 8,122 $ 8,915 The following tables present the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans: Loan Balance Recorded Investment Loans Past Due Over 90 Days, Still Accruing June 30, 2017 One-to-four family residential real estate $ 3,726 $ 2,034 $ — One-to-four family residential real estate – non-owner occupied 709 551 — Multi-family mortgage - Illinois 381 371 — $ 4,816 $ 2,956 $ — December 31, 2016 One-to-four family residential real estate $ 2,861 $ 2,483 $ — One-to-four family residential real estate – non-owner occupied 428 368 — Multi-family mortgage - Illinois 187 185 — Nonresidential real estate 262 260 — $ 3,738 $ 3,296 $ — Nonaccrual loans and impaired loans are defined differently. Some loans may be included in both categories, and some may only be included in one category. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. The Company’s reserve for uncollected loan interest was $238,000 and $199,000 at June 30, 2017 and December 31, 2016 , respectively. When a loan is on nonaccrual status and the ultimate collectability of the total principal of an impaired loan is in doubt, all payments are applied to principal under the cost recovery method. Alternatively, when a loan is on non-accrual status but there is doubt concerning only the ultimate collectability of interest, contractual interest is credited to interest income only when received, under the cash basis method pursuant to the provisions of FASB ASC 310–10, as applicable. In all cases, the average balances are calculated based on the month–end balances of the financing receivables within the period reported pursuant to the provisions of FASB ASC 310–10, as applicable. The following tables present the aging of the recorded investment of loans at June 30, 2017 by class of loans: 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total One-to-four family residential real estate loans $ — $ 98 $ 2,034 $ 2,132 $ 84,771 $ 86,903 One-to-four family residential real estate loans – non-owner occupied 2 3 551 556 27,559 28,115 Multi-family mortgage - Illinois — — 371 371 290,277 290,648 Multi-family mortgage - Other — — — — 258,835 258,835 Nonresidential real estate — — — — 174,126 174,126 Construction — — — — 1,962 1,962 Land — — — — 302 302 Commercial loans: Regional commercial banking — — — — 41,027 41,027 Health care — — — — 54,176 54,176 Direct commercial lessor — — — — 34,198 34,198 Commercial leases: Investment rated commercial leases — — — — 256,938 256,938 Other commercial leases — — — — 105,426 105,426 Consumer 1 — — 1 1,836 1,837 $ 3 $ 101 $ 2,956 $ 3,060 $ 1,331,433 $ 1,334,493 The following tables present the aging of the recorded investment of loans at December 31, 2016 by class of loans: 30-59 Days Past Due 60-89 Days Past Due 90 Days or Total Past Due Loans Not Past Due Total One-to-four family residential real estate loans $ 984 $ 335 $ 2,235 $ 3,554 $ 92,665 $ 96,219 One-to-four family residential real estate loans – non-owner occupied 664 114 368 1,146 37,179 38,325 Multi-family mortgage - Illinois 605 439 184 1,228 294,223 295,451 Multi-family mortgage - Other — — — — 243,944 243,944 Nonresidential real estate — — 260 260 178,644 178,904 Construction — — — — 950 950 Land — — — — 349 349 Commercial loans: Regional commercial banking — — — — 36,086 36,086 Health care — — — — 35,455 35,455 Direct commercial lessor — — — — 31,847 31,847 Commercial leases: Investment rated commercial leases 51 — — 51 269,430 269,481 Other commercial leases — — — — 84,988 84,988 Consumer — — — — 2,263 2,263 $ 2,304 $ 888 $ 3,047 $ 6,239 $ 1,308,023 $ 1,314,262 The Company evaluates loan extensions or modifications in accordance with FASB ASC 310–40 with respect to the classification of the loan as a Troubled Debt Restructuring ("TDR"). In general, if the Company grants a loan extension or modification to a borrower for other than an insignificant period of time that includes a below–market interest rate, principal forgiveness, payment forbearance or other concession intended to minimize the economic loss to the Company, the loan extension or loan modification is classified as a TDR. In cases where borrowers are granted new terms that provide for a reduction of either interest or principal then due and payable, management measures any impairment on the restructured loan in the same manner as for impaired loans as noted above. The Company had $17,000 of TDRs at June 30, 2017 , compared to $341,000 at December 31, 2016 . No specific valuation reserves were allocated to those loans at June 30, 2017 and December 31, 2016 . The Company had no outstanding commitments to borrowers whose loans were classified as TDRs at either date. The following table presents loans classified as TDRs: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ — $ 205 Troubled debt restructured loans – accrual loans — 205 One-to-four family residential real estate 17 136 Troubled debt restructured loans – nonaccrual loans 17 136 Total troubled debt restructured loans $ 17 $ 341 During the six months ended June 30, 2017 , there were no loans modified and classified as TDRs. During the six months ended June 30, 2016 , the terms of certain loans were modified and classified as TDRs. The modification of the terms of such loans included one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. The following tables present TDR activity: Six Months Ended June 30, 2017 2016 Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment One-to-four family residential real estate — $ — $ — 1 $ 63 $ 63 Due to Due to Due to Total For the Six Months Ended June 30, 2016 One-to-four family residential real estate $ — $ 63 $ — $ 63 The TDRs described above had no impact on interest income, resulted in no change to the allowance for loan losses allocated and resulted in no charge-offs for the six months ended June 30, 2016 . The following table presents TDRs for which there was a payment default during the six months ended June 30, 2017 and 2016 within twelve months following the modification. 2017 2016 Number of loans Recorded investment Number of loans Recorded investment One-to-four family residential real estate 1 $ 17 3 $ 104 A TDR is considered to be in payment default once it is 90 days contractually past due under the modified terms. The TDRs for which there was a payment default resulted in no change to the allowance for loan losses allocated and resulted in no charge-offs during the six months ended June 30, 2017 and 2016 . There were certain other loan modifications during the three and six months ended June 30, 2017 and 2016 that did not meet the definition of a TDR. These loans had a total recorded investment of $133,000 and $255,000 at June 30, 2017 and 2016 , respectively. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, including current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans based on credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed on a monthly basis. The Company uses the following definitions for risk ratings: Special Mention. A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification. Substandard. Loans categorized as Substandard continue to accrue interest, but exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt. The loans continue to accrue interest because they are well secured and collection of principal and interest is expected within a reasonable time. The risk rating guidance published by the Office of the Comptroller of the Currency clarifies that a loan with a well-defined weakness does not have to present a probability of default for the loan to be rated Substandard, and that an individual loan’s loss potential does not have to be distinct for the loan to be rated Substandard. Nonaccrual. An asset classified Nonaccrual has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The loans were placed on nonaccrual status. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered “Pass” rated loans. As of June 30, 2017 , based on the most recent analysis performed, the risk categories of loans by class of loans are as follows: Pass Special Mention Substandard Nonaccrual Total One-to-four family residential real estate loans $ 84,977 $ — $ 324 $ 2,030 $ 87,331 One-to-four family residential real estate loans – non-owner occupied 27,736 — 40 552 28,328 Multi-family mortgage loans - Illinois 293,342 — 487 374 294,203 Multi-family mortgage loans - Other 261,488 — — — 261,488 Nonresidential real estate loans 177,330 — 106 — 177,436 Construction loans 1,957 — — — 1,957 Land loans 308 — — — 308 Commercial loans: Regional commercial banking 41,001 — 7 — 41,008 Health care 53,162 — 1,000 — 54,162 Direct commercial lessor 34,030 — — — 34,030 Commercial leases: Investment rated commercial leases 255,375 — — — 255,375 Other commercial leases 105,022 — — — 105,022 Consumer 1,823 — 6 — 1,829 $ 1,337,551 $ — $ 1,970 $ 2,956 $ 1,342,477 As of December 31, 2016 , the risk categories of loans by class of loans are as follows: Pass Special Mention Substandard Nonaccrual Total One-to-four family residential real estate loans $ 93,514 $ — $ 629 $ 2,486 $ 96,629 One-to-four family residential real estate loans – non-owner occupied 38,179 — 41 369 38,589 Multi-family mortgage loans - Illinois 297,826 122 1,048 187 299,183 Multi-family mortgage loans - Other 243,704 — — — 243,704 Nonresidential real estate loans 180,047 — 1,845 260 182,152 Construction loans 946 — — — 946 Land loans 356 — — — 356 Commercial loans: Regional commercial banking 35,944 — 66 — 36,010 Health care 35,372 — — — 35,372 Direct commercial lessor 30,881 800 — — 31,681 Commercial leases: Investment rated commercial leases 268,022 — — — 268,022 Other commercial leases 84,356 161 — — 84,517 Consumer 2,255 — — — 2,255 $ 1,311,402 $ 1,083 $ 3,629 $ 3,302 $ 1,319,416

Other Real Estate Owned (Notes)

Other Real Estate Owned (Notes)	6 Months Ended
	Jun. 30, 2017
Other Real Estate [Abstract]
Real Estate Owned [Text Block]	eal estate that is acquired through foreclosure or a deed in lieu of foreclosure is classified as other real estate owned ("OREO") until it is sold. When real estate is acquired through foreclosure or by deed in lieu of foreclosure, it is recorded at its fair value, less the estimated costs of disposal. If the fair value of the property is less than the loan balance, the difference is charged against the allowance for loan losses. June 30, 2017 December 31, 2016 Balance Valuation Allowance Net OREO Balance Balance Valuation Allowance Net OREO Balance One–to–four family residential $ 1,997 $ (51 ) $ 1,946 $ 1,702 $ (137 ) $ 1,565 Multi-family mortgage 361 (4 ) 357 370 — 370 Nonresidential real estate 1,902 (166 ) 1,736 1,171 (105 ) 1,066 Land 944 (87 ) 857 1,101 (207 ) 894 $ 5,204 $ (308 ) $ 4,896 $ 4,344 $ (449 ) $ 3,895 The following represents the roll forward of OREO and the composition of OREO properties: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Beginning balance $ 5,301 $ 5,629 $ 3,895 $ 7,011 New foreclosed properties — 56 1,936 121 Valuation adjustments (54 ) (10 ) (74 ) (129 ) Sales and Payments (351 ) (302 ) (861 ) (1,630 ) Ending balance $ 4,896 $ 5,373 $ 4,896 $ 5,373 Activity in the valuation allowance is as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Beginning balance $ 410 $ 654 $ 449 $ 1,042 Additions charged to expense 54 10 74 129 Reductions from sales of other real estate owned (156 ) — (215 ) (507 ) Ending balance $ 308 $ 664 $ 308 $ 664 At June 30, 2017 and December 31, 2016 , the balance of OREO included no foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property without title. At June 30, 2017 and December 31, 2016 , the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceeds are in process was $1.5 million and $1.6 million , respectively.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Stock Ownership Plan . On March 29, 2017, the BankFinancial, NA Employee Stock Ownership Plan (the "ESOP") was terminated and the ESOP repaid all amounts owing under the ESOP’s Term Loan Agreement with the Company (the “Share Acquisition Loan”). The ESOP repaid the Share Acquisition Loan by transferring 753,490 unallocated shares of the Company’s common stock to the Company in exchange for the full satisfaction of the Share Acquisition Loan, using the valuation method provided for in the ESOP. A total of 78,362 unallocated shares remained in the ESOP after the Share Acquisition Loan was repaid, and these shares were released and will be allocated to the accounts of eligible ESOP participants who were actively employed by the Bank as of March 29, 2017, based on their account balances, subject to the receipt of a favorable IRS determination letter. These transactions resulted in the recording of one-time, non-cash, non-tax deductible equity compensation expense of $1.1 million in the first quarter of 2017. The Share Acquisition Loan had no outstanding principal balance at June 30, 2017 and an outstanding principal balance of $10.8 million at December 31, 2016 . The Company made the Share Acquisition Loan to the ESOP in the original principal amount of $19.6 million in connection with the Company’s mutual to stock conversion in June of 2005. The proceeds of the Share Acquisition Loan were used by the ESOP to purchase 1,957,300 shares of the Company’s common stock issued in the subscription offering price of $10.00 per share. The Share Acquisition Loan was secured by a pledge of the acquired shares and the ESOP made annual loan payments with funds it received from the Bank’s discretionary contributions to the ESOP in subsequent years and dividends it received on unallocated shares. As loan payments were made, the Company recorded compensation expense based on the allocation of shares released. ESOP benefit expense was recorded based upon the fair value of the awarded shares, net of dividends and interest received on unallocated ESOP shares. ESOP benefit expense totaled $1.3 million for the year ended December 31, 2016 . Shares held by the ESOP were as follows: June 30, 2017 December 31, 2016 Allocated to participants 1,203,810 1,125,448 Distributed to participants (317,914 ) (313,223 ) Unearned — 831,852 Total ESOP shares 885,896 1,644,077 Fair value of unearned shares $ — $ 12,328

Equity Incentive Plans (Notes)

Equity Incentive Plans (Notes)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans	EQUITY INCENTIVE PLAN On June 27, 2006, the Company’s stockholders approved the BankFinancial Corporation 2006 Equity Incentive Plan, which authorized the Human Resources Committee of the Board of Directors of the Company to grant a variety of cash- and equity-based incentive awards, including stock options, stock appreciation rights, restricted stock, performance shares and other incentive awards, to employees and directors aggregating up to 3,425,275 shares of the Company’s common stock. The Plan provides that no awards may be granted under the Plan after the ten -year anniversary of the Effective Date. Consequently, no further awards will be granted under this Plan. As of December 31, 2016 , there were 1,752,156 stock options outstanding. The Company recognized $979,000 of equity-based compensation expense relating to the granting of stock options for the year ended December 31, 2016 . There was no equity-based compensation expense for the six months ended June 30, 2017 . A summary of the activity in the stock option plan for 2017 and 2016 follows: Stock Options Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) Stock options outstanding at December 31, 2015 1,752,156 $ 12.30 1.48 $ 778 Stock options granted — — Stock options exercised — — Stock options outstanding at December 31, 2016 1,752,156 $ 12.30 0.48 $ 4,422 Stock options granted — — Stock options exercised (1,752,156 ) 12.30 Stock options outstanding at June 30, 2017 — $ — 0 $ — (1) Stock option aggregate intrinsic value represents the number of shares subject to options multiplied by the difference (if positive) in the closing market price of the common stock underlying the options on the date shown and the weighted average exercise price. During the six months ended June 30, 2017 , 1,752,156 stock options were exercised. All stock options were exercised on a net settlement basis, using a portion of the shares obtained upon exercise to pay the exercise price of the stock option. The net settlement resulted in the issuance of 280,554 shares of the Company's common stock. Certain employees chose to use a portion of the net shares received upon the exercise to pay required tax withholdings. This reduced the net shares issued by 82,528 shares to 198,026 shares.

Fair Value (Notes)

Fair Value (Notes)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: • Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. • Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. The Company used the following methods and significant assumptions to estimate the fair value of each type of financial instrument: Securities : The fair values of marketable equity securities are generally determined by quoted prices, in active markets, for each specific security (Level 1). If Level 1 measurement inputs are not available for a marketable equity security, we determine its fair value based on the quoted price of a similar security traded in an active market (Level 2). The fair values of debt securities are generally determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities, but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2). Impaired Loans: The fair value of impaired loans with specific allocations of the allowance for loan losses is generally based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted in accordance with the allowance policy. Other Real Estate Owned: Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than annually. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach with data from comparable properties. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly. The following table sets forth the Company’s financial assets that were accounted for at fair value and are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value June 30, 2017 Securities: Certificates of deposit $ — $ 90,619 $ — $ 90,619 Equity mutual fund 501 — — 501 Mortgage-backed securities – residential — 13,629 — 13,629 Collateralized mortgage obligations – residential — 4,999 — 4,999 SBA-guaranteed loan participation certificates — 14 — 14 $ 501 $ 109,261 $ — $ 109,762 December 31, 2016 Securities: Certificates of deposit $ — $ 85,938 $ — $ 85,938 Equity mutual fund 499 — — 499 Mortgage-backed securities - residential — 15,184 — 15,184 Collateralized mortgage obligations – residential — 5,574 — 5,574 SBA-guaranteed loan participation certificates — 17 — 17 $ 499 $ 106,713 $ — $ 107,212 The following table sets forth the Company’s assets that were measured at fair value on a non-recurring basis: Fair Value Measurement Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value June 30, 2017 Other real estate owned: One-to-four family residential real estate $ — $ — $ 102 $ 102 Multi-family mortgage — — 112 112 Nonresidential real estate — — 900 900 $ — $ — $ 1,114 $ 1,114 December 31, 2016 Impaired loans: Nonresidential real estate — — 234 234 $ — $ — $ 234 $ 234 Other real estate owned: One-to-four family residential real estate $ — $ — $ 1,282 $ 1,282 Nonresidential real estate — — 553 553 Land — — 47 47 $ — $ — $ 1,882 $ 1,882 At June 30, 2017 there were no impaired loans that were measured for impairment using the fair value of the collateral for collateral–dependent loans and which had specific valuation allowances, compared to one impaired loan with a carrying amount of $260,000 and having specific valuation allowance of $26,000 at December 31, 2016 . The decrease in the valuation allowance resulted in a decrease in the provision for loan losses of $26,000 for the six months ended June 30, 2017 . There was an increase in the provision for loan losses of $37,000 for the six months ended June 30, 2016 . OREO, which is carried at the lower of cost or fair value less costs to sell, had a carrying value of $1.3 million less a valuation allowance of $179,000 , or $1.1 million , at June 30, 2017 , compared to a carrying value of $2.3 million less a valuation allowance of $434,000 , or $1.9 million , at December 31, 2016 . There were $74,000 of valuation adjustments of OREO recorded for the six months ended June 30, 2017 . There were $129,000 of valuation adjustments of OREO recorded for the six months ended June 30, 2016 . The following table presents quantitative information, based on certain empirical data with respect to Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at June 30, 2017 : Fair Value Valuation Technique(s) Significant Unobservable Input(s) Range (Weighted Average) Other real estate owned: One-to-four family residential real estate $ 102 Sales comparison Discount applied to valuation 5.6% Multi-family mortgage 112 Sales comparison Comparison between sales and income approaches 1.0% Nonresidential real estate loans $ 900 Sales comparison Comparison between sales and income approaches -3.66% - 15.22% Other real estate owned $ 1,114 The following table presents quantitative information, based on certain empirical data with respect to Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2016 : Fair Value Valuation Technique(s) Significant Unobservable Input(s) Range (Weighted Average) Impaired loans Nonresidential real estate $ 234 Sales comparison Comparison between sales and income approaches -10.2% Income approach Cap Rate 8.5% $ 234 Other real estate owned One-to-four family residential real estate $ 1,282 Sales comparison Discount applied to valuation 8.62% to 20.04% (11.9%) Nonresidential real estate 553 Sales comparison Comparison between sales and income approaches -3.22% to 4.58% (3.7%) Land 47 Sales comparison Discount applied to valuation 5.74% to 31.60% (25.2%) $ 1,882 The carrying amount and estimated fair value of financial instruments are as follows: Fair Value Measurements at June 30, 2017 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 81,606 $ 9,835 $ 71,771 $ — $ 81,606 Securities 109,762 501 109,261 — 109,762 Loans receivable, net of allowance for loan losses 1,335,835 — 1,342,214 — 1,342,214 FHLBC and FRB stock 8,290 — — — N/A Accrued interest receivable 4,488 — 4,488 — 4,488 Financial liabilities Noninterest-bearing demand deposits $ 229,921 $ — $ 229,921 $ — $ 229,921 Savings deposits 160,544 — 160,544 — 160,544 NOW and money market accounts 591,700 — 591,700 — 591,700 Certificates of deposit 365,722 — 364,543 — 364,543 Borrowings 50,877 — 50,024 — 50,024 Accrued interest payable 166 — 166 — 166 Fair Value Measurements at December 31, 2016 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 96,684 $ 13,053 $ 83,631 $ — $ 96,684 Securities 107,212 499 106,713 — 107,212 Loans receivable, net of allowance for loan losses 1,312,952 — 1,322,713 234 1,322,947 FHLBC and FRB stock 11,650 — — — N/A Accrued interest receivable 4,381 — 4,381 — 4,381 Financial liabilities Noninterest-bearing demand deposits $ 249,539 $ — $ 249,539 $ — $ 249,539 Savings deposits 160,002 — 160,002 — 160,002 NOW and money market accounts 578,237 — 578,237 — 578,237 Certificates of deposit 351,612 — 350,593 — 350,593 Borrowings 51,069 — 50,015 — 50,015 Accrued interest payable 102 — 102 — 102 For purposes of the above, the following assumptions were used: Cash and Cash Equivalents : The estimated fair values for cash and cash equivalents are based on their carrying value due to the short-term nature of these assets. Loans : The estimated fair value for loans has been determined by calculating the present value of future cash flows based on the current rate the Company would charge for similar loans with similar maturities, applied for an estimated time period until the loan is assumed to be repriced or repaid. FHLBC and FRB Stock : It is not practicable to determine the fair value of FHLBC and FRB stock due to the restrictions placed on their transferability. Deposit Liabilities : The estimated fair value for certificates of deposit has been determined by calculating the present value of future cash flows based on estimates of rates the Company would pay on such deposits, applied for the time period until maturity. The estimated fair values of noninterest-bearing demand, NOW, money market, and savings deposits are assumed to approximate their carrying values as management establishes rates on these deposits at a level that approximates the local market area. Additionally, these deposits can be withdrawn on demand. Borrowings : The estimated fair values of advances from the FHLBC and notes payable are based on current market rates for similar financing. The estimated fair value of securities sold under agreements to repurchase is assumed to equal its carrying value due to the short-term nature of the liability. Accrued Interest : The estimated fair values of accrued interest receivable and payable are assumed to equal their carrying value. Off - Balance-Sheet Instruments : Off-balance-sheet items consist principally of unfunded loan commitments, standby letters of credit, and unused lines of credit. The estimated fair values of unfunded loan commitments, standby letters of credit, and unused lines of credit are not material. While the above estimates are based on management’s judgment of the most appropriate factors, as of the balance sheet date, there is no assurance that the estimated fair values would have been realized if the assets were disposed of or the liabilities settled at that date, since market values may differ depending on the various circumstances. The estimated fair values would also not apply to subsequent dates. In addition, other assets and liabilities that are not financial instruments, such as premises and equipment, are not included in the above disclosures.

Summary of Significant Accoun17

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation : BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, National Association (the “Bank”). The interim unaudited consolidated financial statements include the accounts of and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BF Asset Recovery Corporation (collectively, “the Company”), and reflect all normal and recurring adjustments that are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three- and six -month periods ended June 30, 2017 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2017 . Certain information and note disclosures normally included in financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Use of Estimates : To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and future results could differ. Reclassifications : Certain reclassifications have been made in the prior period’s financial statements to conform them to the current period’s presentation. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , as filed with the Securities and Exchange Commission. Recent Accounti
Basis of Presentation	Basis of Presentation : BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, National Association (the “Bank”).
Principles of Consolidation	The interim unaudited consolidated financial statements include the accounts of and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BF Asset Recovery Corporation (collectively, “the Company”), and reflect all normal and recurring adjustments that are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three- and six -month periods ended June 30, 2017 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2017 . Certain information and note disclosures normally included in financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Use of Estimate
Use of Estimates	Use of Estimates : To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and future results could differ.
Uncollected Interest Policy	The Company’s reserve for uncollected loan interest was $238,000 and $199,000 at June 30, 2017 and December 31, 2016 , respectively. When a loan is on nonaccrual status and the ultimate collectability of the total principal of an impaired loan is in doubt, all payments are applied to principal under the cost recovery method. Alternatively, when a loan is on non-accrual status but there is doubt concerning only the ultimate collectability of interest, contractual interest is credited to interest income only when received, under the cash basis method pursuant to the provisions of FASB ASC 310–10, as applicable. In all cases, the average balances are calculated based on the month–end balances of the financing receivables within the period reported pursuant to the provisions of FASB ASC 310–10, as applicable.
Reclassifications	Reclassifications : Certain reclassifications have been made in the prior period’s financial statements to conform them to the current period’s presentation. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , as filed with the Securities and Exchange Commission.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should 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. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on the consolidated financial statements as the majority of our business transactions will not be subject to this pronouncement. On January 5, 2016, the FASB issued an update (ASU No. 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Liabilities). The new guidance is intended to improve the recognition and measurement of financial instruments by requiring: equity investments (other than equity method or consolidation) to be measured at fair value with changes in fair value recognized in net income; public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets ( i.e. securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; eliminating the requirement for non-public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is to be required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requiring a reporting organization to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance is effective for public business entities for fiscal years beginning after December 15, 2017. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our Statement of Operations. The pronouncement will require some revision to our disclosures within the consolidated financial statements and we are currently evaluating the impact. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our consolidated financial statements as the projected minimum lease payments under existing leases subject to the new pronouncement are less than one percent of our current total assets. In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. ASU 2016-09 was effective January 1, 2017. This new pronouncement affects the effective tax rate reported as existing vested stock options are exercised. The amount of the impact on the effective tax rate is determined by the number of stock options exercised and the stock price of the Company when the stock options are exercised. Excess tax benefits and deficiencies are recorded in the tax expense. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). These amendments require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 ( i.e. , January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our initial review indicates that we have maintained sufficient historical loan data to support the requirements of this pronouncement. We are currently evaluating various loss methodologies to determine their correlation to our various loan categories' historical performance. In March of 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“ASU 2017-08”). This guidance shortens the amortization period for premiums on certain callable debt securities to the earliest call date (with an explicit, noncontingent call feature that is callable at a fixed price and on a preset dates), rather than contractual maturity date as currently required under GAAP. The ASU does not impact instruments without preset call dates such as mortgage-backed securities. For instruments with contingent call features, once the contingency is resolved and the security is callable at a fixed price and preset date, the security is within the scope of the ASU. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted. Effective January 2017, we early adopted the pronouncement. Adoption of the new pronouncement was immaterial to the consolidated financial statements.

Summary of Significant Accoun18

Summary of Significant Accounting Policies New Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2017
Text Block [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should 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. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on the consolidated financial statements as the majority of our business transactions will not be subject to this pronouncement. On January 5, 2016, the FASB issued an update (ASU No. 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Liabilities). The new guidance is intended to improve the recognition and measurement of financial instruments by requiring: equity investments (other than equity method or consolidation) to be measured at fair value with changes in fair value recognized in net income; public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets ( i.e. securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; eliminating the requirement for non-public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is to be required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requiring a reporting organization to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance is effective for public business entities for fiscal years beginning after December 15, 2017. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our Statement of Operations. The pronouncement will require some revision to our disclosures within the consolidated financial statements and we are currently evaluating the impact. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our consolidated financial statements as the projected minimum lease payments under existing leases subject to the new pronouncement are less than one percent of our current total assets. In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. ASU 2016-09 was effective January 1, 2017. This new pronouncement affects the effective tax rate reported as existing vested stock options are exercised. The amount of the impact on the effective tax rate is determined by the number of stock options exercised and the stock price of the Company when the stock options are exercised. Excess tax benefits and deficiencies are recorded in the tax expense. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). These amendments require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 ( i.e. , January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our initial review indicates that we have maintained sufficient historical loan data to support the requirements of this pronouncement. We are currently evaluating various loss methodologies to determine their correlation to our various loan categories' historical performance. In March of 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“ASU 2017-08”). This guidance shortens the amortization period for premiums on certain callable debt securities to the earliest call date (with an explicit, noncontingent call feature that is callable at a fixed price and on a preset dates), rather than contractual maturity date as currently required under GAAP. The ASU does not impact instruments without preset call dates such as mortgage-backed securities. For instruments with contingent call features, once the contingency is resolved and the security is callable at a fixed price and preset date, the security is within the scope of the ASU. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted. Effective January 2017, we early adopted the pronouncement. Adoption of the new pronouncement was immaterial to the consolidated financial statements.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	ngs per share reflect earnings available to common stockholders for the period divided by the weighted average number of shares of common stock outstanding during the period, exclusive of unearned ESOP shares and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock. Three Months Ended Six Months Ended 2017 2016 2017 2016 Net income available to common stockholders $ 2,572 $ 831 $ 4,453 $ 2,735 Average common shares outstanding 18,330,972 19,827,581 18,784,934 19,991,561 Less: Unearned ESOP shares — (694,773 ) (298,813 ) (706,941 ) Unvested restricted stock shares (940 ) (2,690 ) (940 ) (5,290 ) Weighted average common shares outstanding 18,330,032 19,130,118 18,485,181 19,279,330 Add - Net effect of dilutive unvested restricted stock 423 317 416 312 Diluted weighted average common shares outstanding 18,330,455 19,130,435 18,485,597 19,279,642 Basic earnings per common share $ 0.14 $ 0.04 $ 0.24 $ 0.14 Diluted earnings per common share $ 0.14 $ 0.04 $ 0.24 $ 0.14 Number of antidilutive stock options excluded from the diluted earnings per share calculation — 536,459 — 536,459 Weighted average exercise price of anti-dilutive option shares $ — $ 12.99 $ — $ 12.99

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value June 30, 2017 Certificates of deposit $ 90,619 $ — $ — $ 90,619 Equity mutual fund 500 1 — 501 Mortgage-backed securities - residential 13,095 553 (19 ) 13,629 Collateralized mortgage obligations - residential 5,008 13 (22 ) 4,999 SBA-guaranteed loan participation certificates 14 — — 14 $ 109,236 $ 567 $ (41 ) $ 109,762 December 31, 2016 Certificates of deposit $ 85,938 $ — $ — $ 85,938 Equity mutual fund 500 — (1 ) 499 Mortgage-backed securities - residential 14,561 644 (21 ) 15,184 Collateralized mortgage obligations - residential 5,587 15 (28 ) 5,574 SBA-guaranteed loan participation certificates 17 — — 17 $ 106,603 $ 659 $ (50 ) $ 107,212 The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at June 30, 2017 and December 31, 2016 . The amortized cost and fair values of securities by contractual maturity are shown below. Securities not due at a single maturity date are shown separately. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2017 Amortized Cost Fair Value Due in one year or less $ 90,619 $ 90,619 Equity mutual fund 500 501 Mortgage-backed securities - residential 13,095 13,629 Collateralized mortgage obligations - residential 5,008 4,999 SBA-guaranteed loan participation certificates 14 14 $ 109,236 $ 109,762 Sales of securities were as follows: Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds $ — $ — $ — $ 46 Gross gains — — — 46 Securities with unrealized losses not recognized in income are as follows: Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 30, 2017 Mortgage-backed securities - residential $ 1,167 $ (19 ) $ — $ — $ 1,167 $ (19 ) Collateralized mortgage obligations - residential — — 3,490 (22 ) 3,490 (22 ) $ 1,167 $ (19 ) $ 3,490 $ (22 ) $ 4,657 $ (41 ) December 31, 2016 Equity Mutual Fund $ 499 $ (1 ) $ — $ — $ 499 $ (1 ) Mortgage-backed securities - residential 1,187 (21 ) — — 1,187 (21 ) Collateralized mortgage obligations - residential 3,691 (18 ) 1,028 (10 ) 4,719 (28 ) $ 5,377 $ (40 ) $ 1,028 $ (10 ) $ 6,405 $ (50 ) The Company evaluates marketable investment securities with significant declines in fair value on a quarterly basis to determine whether they should be considered other-than-temporarily impaired under current accounting guidance, which generally provides that if a marketable security is in an unrealized loss position, whether due to general market conditions or industry or issuer-specific factors, the holder of the securities must assess whether the impairment is other-than-temporary. Certain mortgage-backed securities and collateralized mortgage obligations that the Company holds in its investment portfolio were in an unrealized loss position at June 30, 2017 , but the unrealized losses were not considered significant under the Company’s impairment testing methodology. In addition, the Company does not intend to sell these securities, and it is likely that the Company will not be required to sell these securities before their anticipated recovery occurs.
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)	The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value June 30, 2017 Certificates of deposit $ 90,619 $ — $ — $ 90,619 Equity mutual fund 500 1 — 501 Mortgage-backed securities - residential 13,095 553 (19 ) 13,629 Collateralized mortgage obligations - residential 5,008 13 (22 ) 4,999 SBA-guaranteed loan participation certificates 14 — — 14 $ 109,236 $ 567 $ (41 ) $ 109,762 December 31, 2016 Certificates of deposit $ 85,938 $ — $ — $ 85,938 Equity mutual fund 500 — (1 ) 499 Mortgage-backed securities - residential 14,561 644 (21 ) 15,184 Collateralized mortgage obligations - residential 5,587 15 (28 ) 5,574 SBA-guaranteed loan participation certificates 17 — — 17 $ 106,603 $ 659 $ (50 ) $ 107,212
Amortized cost and fair values of securities	The amortized cost and fair values of securities by contractual maturity are shown below. Securities not due at a single maturity date are shown separately. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2017 Amortized Cost Fair Value Due in one year or less $ 90,619 $ 90,619 Equity mutual fund 500 501 Mortgage-backed securities - residential 13,095 13,629 Collateralized mortgage obligations - residential 5,008 4,999 SBA-guaranteed loan participation certificates 14 14 $ 109,236 $ 109,762
Securities with unrealized losses	Securities with unrealized losses not recognized in income are as follows: Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 30, 2017 Mortgage-backed securities - residential $ 1,167 $ (19 ) $ — $ — $ 1,167 $ (19 ) Collateralized mortgage obligations - residential — — 3,490 (22 ) 3,490 (22 ) $ 1,167 $ (19 ) $ 3,490 $ (22 ) $ 4,657 $ (41 ) December 31, 2016 Equity Mutual Fund $ 499 $ (1 ) $ — $ — $ 499 $ (1 ) Mortgage-backed securities - residential 1,187 (21 ) — — 1,187 (21 ) Collateralized mortgage obligations - residential 3,691 (18 ) 1,028 (10 ) 4,719 (28 ) $ 5,377 $ (40 ) $ 1,028 $ (10 ) $ 6,405 $ (50 )

Loans Receivable (Tables)

Loans Receivable (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans By Class Modified As Troubled Debt Restructurings With Payment Default [Table Text Block]	The following table presents TDRs for which there was a payment default during the six months ended June 30, 2017 and 2016 within twelve months following the modification. 2017 2016 Number of loans Recorded investment Number of loans Recorded investment One-to-four family residential real estate 1 $ 17 3 $ 104
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans receivable are as follows: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ 115,659 $ 135,218 Multi-family mortgage 555,691 542,887 Nonresidential real estate 177,436 182,152 Construction and land 2,265 1,302 Commercial loans 129,200 103,063 Commercial leases 360,397 352,539 Consumer 1,829 2,255 1,342,477 1,319,416 Net deferred loan origination costs 1,480 1,663 Allowance for loan losses (8,122 ) (8,127 ) Loans, net $ 1,335,835 $ 1,312,952 The following tables present the balance in the allowance for loan losses and the loans receivable by portfolio segment and based on impairment method: Allowance for loan losses Loan Balances Individually evaluated for impairment Collectively evaluated for impairment Total Individually evaluated for impairment Collectively evaluated for impairment Total June 30, 2017 One-to-four family residential real estate $ — $ 912 $ 912 $ 4,745 $ 110,914 $ 115,659 Multi-family mortgage — 3,668 3,668 965 554,726 555,691 Nonresidential real estate — 1,631 1,631 — 177,436 177,436 Construction and land — 54 54 — 2,265 2,265 Commercial loans — 1,012 1,012 — 129,200 129,200 Commercial leases — 830 830 — 360,397 360,397 Consumer — 15 15 — 1,829 1,829 $ — $ 8,122 $ 8,122 $ 5,710 $ 1,336,767 1,342,477 Net deferred loan origination costs 1,480 Allowance for loan losses (8,122 ) Loans, net $ 1,335,835 Allowance for loan losses Loan Balances Individually evaluated for impairment Collectively evaluated for impairment Total Individually evaluated for impairment Collectively evaluated for impairment Total December 31, 2016 One-to-four family residential real estate $ — $ 1,168 $ 1,168 $ 4,962 $ 130,256 $ 135,218 Multi-family mortgage — 3,647 3,647 787 542,100 542,887 Nonresidential real estate 26 1,768 1,794 260 181,892 182,152 Construction and land — 32 32 — 1,302 1,302 Commercial loans — 733 733 — 103,063 103,063 Commercial leases — 714 714 — 352,539 352,539 Consumer — 39 39 — 2,255 2,255 $ 26 $ 8,101 $ 8,127 $ 6,009 $ 1,313,407 1,319,416 Net deferred loan origination costs 1,663 Allowance for loan losses (8,127 ) Loans, net $ 1,312,952 Activity in the allowance for loan losses is as follows: Three Months Ended Six Months Ended 2017 2016 2017 2016 Beginning balance $ 7,971 $ 9,416 $ 8,127 $ 9,691 Loans charged off: One-to-four family residential real estate (22 ) (355 ) (193 ) (407 ) Multi-family mortgage — (6 ) (3 ) (51 ) Nonresidential real estate — (1,657 ) (165 ) (1,660 ) Consumer — (2 ) — (18 ) (22 ) (2,020 ) (361 ) (2,136 ) Recoveries: One-to-four family residential real estate 79 6 85 87 Multi-family mortgage 40 9 51 146 Nonresidential real estate — 161 — 161 Construction and land — — — 35 Commercial loans 5 28 10 105 Consumer — — — 1 124 204 146 535 Net recoveries (charge-offs) 102 (1,816 ) (215 ) (1,601 ) Provision for loan losses 49 1,315 210 825 Ending balance $ 8,122 $ 8,915 $ 8,122 $ 8,915 The following tables present the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans: Loan Balance Recorded Investment Loans Past Due Over 90 Days, Still Accruing June 30, 2017 One-to-four family residential real estate $ 3,726 $ 2,034 $ — One-to-four family residential real estate – non-owner occupied 709 551 — Multi-family mortgage - Illinois 381 371 — $ 4,816 $ 2,956 $ — December 31, 2016 One-to-four family residential real estate $ 2,861 $ 2,483 $ — One-to-four family residential real estate – non-owner occupied 428 368 — Multi-family mortgage - Illinois 187 185 — Nonresidential real estate 262 260 — $ 3,738 $ 3,296 $ — Nonaccrual loans and impaired loans are defined differently. Some loans may be included in both categories, and some may only be included in one category. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. The Company’s reserve for uncollected loan interest was $238,000 and $199,000 at June 30, 2017 and December 31, 2016 , respectively. When a loan is on nonaccrual status and the ultimate collectability of the total principal of an impaired loan is in doubt, all payments are applied to principal under the cost recovery method. Alternatively, when a loan is on non-accrual status but there is doubt concerning only the ultimate collectability of interest, contractual interest is credited to interest income only when received, under the cash basis method pursuant to the provisions of FASB ASC 310–10, as applicable. In all cases, the average balances are calculated based on the month–end balances of the financing receivables within the period reported pursuant to the provisions of FASB ASC 310–10, as applicable. The following tables present the aging of the recorded investment of loans at June 30, 2017 by class of loans: 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total One-to-four family residential real estate loans $ — $ 98 $ 2,034 $ 2,132 $ 84,771 $ 86,903 One-to-four family residential real estate loans – non-owner occupied 2 3 551 556 27,559 28,115 Multi-family mortgage - Illinois — — 371 371 290,277 290,648 Multi-family mortgage - Other — — — — 258,835 258,835 Nonresidential real estate — — — — 174,126 174,126 Construction — — — — 1,962 1,962 Land — — — — 302 302 Commercial loans: Regional commercial banking — — — — 41,027 41,027 Health care — — — — 54,176 54,176 Direct commercial lessor — — — — 34,198 34,198 Commercial leases: Investment rated commercial leases — — — — 256,938 256,938 Other commercial leases — — — — 105,426 105,426 Consumer 1 — — 1 1,836 1,837 $ 3 $ 101 $ 2,956 $ 3,060 $ 1,331,433 $ 1,334,493 The following tables present the aging of the recorded investment of loans at December 31, 2016 by class of loans: 30-59 Days Past Due 60-89 Days Past Due 90 Days or Total Past Due Loans Not Past Due Total One-to-four family residential real estate loans $ 984 $ 335 $ 2,235 $ 3,554 $ 92,665 $ 96,219 One-to-four family residential real estate loans – non-owner occupied 664 114 368 1,146 37,179 38,325 Multi-family mortgage - Illinois 605 439 184 1,228 294,223 295,451 Multi-family mortgage - Other — — — — 243,944 243,944 Nonresidential real estate — — 260 260 178,644 178,904 Construction — — — — 950 950 Land — — — — 349 349 Commercial loans: Regional commercial banking — — — — 36,086 36,086 Health care — — — — 35,455 35,455 Direct commercial lessor — — — — 31,847 31,847 Commercial leases: Investment rated commercial leases 51 — — 51 269,430 269,481 Other commercial leases — — — — 84,988 84,988 Consumer — — — — 2,263 2,263 $ 2,304 $ 888 $ 3,047 $ 6,239 $ 1,308,023 $ 1,314,262 The Company evaluates loan extensions or modifications in accordance with FASB ASC 310–40 with respect to the classification of the loan as a Troubled Debt Restructuring ("TDR"). In general, if the Company grants a loan extension or modification to a borrower for other than an insignificant period of time that includes a below–market interest rate, principal forgiveness, payment forbearance or other concession intended to minimize the economic loss to the Company, the loan extension or loan modification is classified as a TDR. In cases where borrowers are granted new terms that provide for a reduction of either interest or principal then due and payable, management measures any impairment on the restructured loan in the same manner as for impaired loans as noted above. The Company had $17,000 of TDRs at June 30, 2017 , compared to $341,000 at December 31, 2016 . No specific valuation reserves were allocated to those loans at June 30, 2017 and December 31, 2016 . The Company had no outstanding commitments to borrowers whose loans were classified as TDRs at either date. The following table presents loans classified as TDRs: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ — $ 205 Troubled debt restructured loans – accrual loans — 205 One-to-four family residential real estate 17 136 Troubled debt restructured loans – nonaccrual loans 17 136 Total troubled debt restructured loans $ 17 $ 341 During the six months ended June 30, 2017 , there were no loans modified and classified as TDRs. During the six months ended June 30, 2016 , the terms of certain loans were modified and classified as TDRs. The modification of the terms of such loans included one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. The following tables present TDR activity: Six Months Ended June 30, 2017 2016 Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment One-to-four family residential real estate — $ — $ — 1 $ 63 $ 63 Due to Due to Due to Total For the Six Months Ended June 30, 2016 One-to-four family residential real estate $ — $ 63 $ — $ 63 The TDRs described above had no impact on interest income, resulted in no change to the allowance for loan losses allocated and resulted in no charge-offs for the six months ended June 30, 2016 . The following table presents TDRs for which there was a payment default during the six months ended June 30, 2017 and 2016 within twelve months following the modification. 2017 2016 Number of loans Recorded investment Number of loans Recorded investment One-to-four family residential real estate 1 $ 17 3 $ 104 A TDR is considered to be in payment default once it is 90 days contractually past due under the modified terms. The TDRs for which there was a payment default resulted in no change to the allowance for loan losses allocated and resulted in no charge-offs during the six months ended June 30, 2017 and 2016 . There were certain other loan modifications during the three and six months ended June 30, 2017 and 2016 that did not meet the definition of a TDR. These loans had a total recorded investment of $133,000 and $255,000 at June 30, 2017 and 2016 , respectively. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, including current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans based on credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed on a monthly basis. The Company uses the following definitions for risk ratings: Special Mention. A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification. Substandard. Loans categorized as Substandard continue to accrue interest, but exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt. The loans continue to accrue interest because they are well secured and collection of principal and interest is expected within a reasonable time. The risk rating guidance published by the Office of the Comptroller of the Currency clarifies that a loan with a well-defined weakness does not have to present a probability of default for the loan to be rated Substandard, and that an individual loan’s loss potential does not have to be distinct for the loan to be rated Substandard. Nonaccrual. An asset classified Nonaccrual has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The loans were placed on nonaccrual status. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered “Pass” rated loans. As of June 30, 2017 , based on the most recent analysis performed, the risk categories of loans by class of loans are as follows: Pass Special Mention Substandard Nonaccrual Total One-to-four family residential real estate loans $ 84,977 $ — $ 324 $ 2,030 $ 87,331 One-to-four family residential real estate loans – non-owner occupied 27,736 — 40 552 28,328 Multi-family mortgage loans - Illinois 293,342 — 487 374 294,203 Multi-family mortgage loans - Other 261,488 — — — 261,488 Nonresidential real estate loans 177,330 — 106 — 177,436 Construction loans 1,957 — — — 1,957 Land loans 308 — — — 308 Commercial loans: Regional commercial banking 41,001 — 7 — 41,008 Health care 53,162 — 1,000 — 54,162 Direct commercial lessor 34,030 — — — 34,030 Commercial leases: Investment rated commercial leases 255,375 — — — 255,375 Other commercial leases 105,022 — — — 105,022 Consumer 1,823 — 6 — 1,829 $ 1,337,551 $ — $ 1,970 $ 2,956 $ 1,342,477 As of December 31, 2016 , the risk categories of loans by class of loans are as follows: Pass Special Mention Substandard Nonaccrual Total One-to-four family residential real estate loans $ 93,514 $ — $ 629 $ 2,486 $ 96,629 One-to-four family residential real estate loans – non-owner occupied 38,179 — 41 369 38,589 Multi-family mortgage loans - Illinois 297,826 122 1,048 187 299,183 Multi-family mortgage loans - Other 243,704 — — — 243,704 Nonresidential real estate loans 180,047 — 1,845 260 182,152 Construction loans 946 — — — 946 Land loans 356 — — — 356 Commercial loans: Regional commercial banking 35,944 — 66 — 36,010 Health care 35,372 — — — 35,372 Direct commercial lessor 30,881 800 — — 31,681 Commercial leases: Investment rated commercial leases 268,022 — — — 268,022 Other commercial leases 84,356 161 — — 84,517 Consumer 2,255 — — — 2,255 $ 1,311,402 $ 1,083 $ 3,629 $ 3,302 $ 1,319,416
Loans receivable	Loans receivable are as follows: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ 115,659 $ 135,218 Multi-family mortgage 555,691 542,887 Nonresidential real estate 177,436 182,152 Construction and land 2,265 1,302 Commercial loans 129,200 103,063 Commercial leases 360,397 352,539 Consumer 1,829 2,255 1,342,477 1,319,416 Net deferred loan origination costs 1,480 1,663 Allowance for loan losses (8,122 ) (8,127 ) Loans, net $ 1,335,835 $ 1,312,952
Loans Receivable Based On Impairment Method [Table Text Block]	The following tables present the balance in the allowance for loan losses and the loans receivable by portfolio segment and based on impairment method: Allowance for loan losses Loan Balances Individually evaluated for impairment Collectively evaluated for impairment Total Individually evaluated for impairment Collectively evaluated for impairment Total June 30, 2017 One-to-four family residential real estate $ — $ 912 $ 912 $ 4,745 $ 110,914 $ 115,659 Multi-family mortgage — 3,668 3,668 965 554,726 555,691 Nonresidential real estate — 1,631 1,631 — 177,436 177,436 Construction and land — 54 54 — 2,265 2,265 Commercial loans — 1,012 1,012 — 129,200 129,200 Commercial leases — 830 830 — 360,397 360,397 Consumer — 15 15 — 1,829 1,829 $ — $ 8,122 $ 8,122 $ 5,710 $ 1,336,767 1,342,477 Net deferred loan origination costs 1,480 Allowance for loan losses (8,122 ) Loans, net $ 1,335,835
Allowance for loan losses	ctivity in the allowance for loan losses is as follows: Three Months Ended Six Months Ended 2017 2016 2017 2016 Beginning balance $ 7,971 $ 9,416 $ 8,127 $ 9,691 Loans charged off: One-to-four family residential real estate (22 ) (355 ) (193 ) (407 ) Multi-family mortgage — (6 ) (3 ) (51 ) Nonresidential real estate — (1,657 ) (165 ) (1,660 ) Consumer — (2 ) — (18 ) (22 ) (2,020 ) (361 ) (2,136 ) Recoveries: One-to-four family residential real estate 79 6 85 87 Multi-family mortgage 40 9 51 146 Nonresidential real estate — 161 — 161 Construction and land — — — 35 Commercial loans 5 28 10 105 Consumer — — — 1 124 204 146 535 Net recoveries (charge-offs) 102 (1,816 ) (215 ) (1,601 ) Provision for loan losses 49 1,315 210 825 Ending balance $ 8,122 $ 8,915 $ 8,122 $ 8,915
Schedule of Financing Receivables, Non Accrual Status	The following tables present the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans: Loan Balance Recorded Investment Loans Past Due Over 90 Days, Still Accruing June 30, 2017 One-to-four family residential real estate $ 3,726 $ 2,034 $ — One-to-four family residential real estate – non-owner occupied 709 551 — Multi-family mortgage - Illinois 381 371 — $ 4,816 $ 2,956 $ — December 31, 2016 One-to-four family residential real estate $ 2,861 $ 2,483 $ — One-to-four family residential real estate – non-owner occupied 428 368 — Multi-family mortgage - Illinois 187 185 — Nonresidential real estate 262 260 — $ 3,738 $ 3,296 $ —
Past Due Financing Receivables	The following tables present the aging of the recorded investment of loans at June 30, 2017 by class of loans: 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total One-to-four family residential real estate loans $ — $ 98 $ 2,034 $ 2,132 $ 84,771 $ 86,903 One-to-four family residential real estate loans – non-owner occupied 2 3 551 556 27,559 28,115 Multi-family mortgage - Illinois — — 371 371 290,277 290,648 Multi-family mortgage - Other — — — — 258,835 258,835 Nonresidential real estate — — — — 174,126 174,126 Construction — — — — 1,962 1,962 Land — — — — 302 302 Commercial loans: Regional commercial banking — — — — 41,027 41,027 Health care — — — — 54,176 54,176 Direct commercial lessor — — — — 34,198 34,198 Commercial leases: Investment rated commercial leases — — — — 256,938 256,938 Other commercial leases — — — — 105,426 105,426 Consumer 1 — — 1 1,836 1,837 $ 3 $ 101 $ 2,956 $ 3,060 $ 1,331,433 $ 1,334,493
Troubled Debt Restructurings on Financing Receivables	The following table presents loans classified as TDRs: June 30, 2017 December 31, 2016 One-to-four family residential real estate $ — $ 205 Troubled debt restructured loans – accrual loans — 205 One-to-four family residential real estate 17 136 Troubled debt restructured loans – nonaccrual loans 17 136 Total troubled debt restructured loans $ 17 $ 341
Financing Receivable Credit Quality Indicators	As of June 30, 2017 , based on the most recent analysis performed, the risk categories of loans by class of loans are as follows: Pass Special Mention Substandard Nonaccrual Total One-to-four family residential real estate loans $ 84,977 $ — $ 324 $ 2,030 $ 87,331 One-to-four family residential real estate loans – non-owner occupied 27,736 — 40 552 28,328 Multi-family mortgage loans - Illinois 293,342 — 487 374 294,203 Multi-family mortgage loans - Other 261,488 — — — 261,488 Nonresidential real estate loans 177,330 — 106 — 177,436 Construction loans 1,957 — — — 1,957 Land loans 308 — — — 308 Commercial loans: Regional commercial banking 41,001 — 7 — 41,008 Health care 53,162 — 1,000 — 54,162 Direct commercial lessor 34,030 — — — 34,030 Commercial leases: Investment rated commercial leases 255,375 — — — 255,375 Other commercial leases 105,022 — — — 105,022 Consumer 1,823 — 6 — 1,829 $ 1,337,551 $ — $ 1,970 $ 2,956 $ 1,342,477
Loans By Class Modified As Troubled Debt Restructuring On Financing Receivables [Table Text Block]	The following tables present TDR activity: Six Months Ended June 30, 2017 2016 Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment Number of loans Pre- Modification outstanding recorded investment Post- Modification outstanding recorded investment One-to-four family residential real estate — $ — $ — 1 $ 63 $ 63 Due to Due to Due to Total For the Six Months Ended June 30, 2016 One-to-four family residential real estate $ — $ 63 $ — $ 63 The TDRs described above had no impact on interest income, resulted in no change to the allowance for loan losses allocated and resulted in no charge-offs for the six months ended June 30, 2016 .

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2017
Other Real Estate [Abstract]
Schedule of Real Estate Properties [Table Text Block]	June 30, 2017 December 31, 2016 Balance Valuation Allowance Net OREO Balance Balance Valuation Allowance Net OREO Balance One–to–four family residential $ 1,997 $ (51 ) $ 1,946 $ 1,702 $ (137 ) $ 1,565 Multi-family mortgage 361 (4 ) 357 370 — 370 Nonresidential real estate 1,902 (166 ) 1,736 1,171 (105 ) 1,066 Land 944 (87 ) 857 1,101 (207 ) 894 $ 5,204 $ (308 ) $ 4,896 $ 4,344 $ (449 ) $ 3,895
Real Estate Owned, rollforward [Table Text Block]	June 30, 2017 December 31, 2016 Balance Valuation Allowance Net OREO Balance Balance Valuation Allowance Net OREO Balance One–to–four family residential $ 1,997 $ (51 ) $ 1,946 $ 1,702 $ (137 ) $ 1,565 Multi-family mortgage 361 (4 ) 357 370 — 370 Nonresidential real estate 1,902 (166 ) 1,736 1,171 (105 ) 1,066 Land 944 (87 ) 857 1,101 (207 ) 894 $ 5,204 $ (308 ) $ 4,896 $ 4,344 $ (449 ) $ 3,895 The following represents the roll forward of OREO and the composition of OREO properties: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Beginning balance $ 5,301 $ 5,629 $ 3,895 $ 7,011 New foreclosed properties — 56 1,936 121 Valuation adjustments (54 ) (10 ) (74 ) (129 ) Sales and Payments (351 ) (302 ) (861 ) (1,630 ) Ending balance $ 4,896 $ 5,373 $ 4,896 $ 5,373
OREO valuation allowance, rollforward [Table Text Block]	Activity in the valuation allowance is as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Beginning balance $ 410 $ 654 $ 449 $ 1,042 Additions charged to expense 54 10 74 129 Reductions from sales of other real estate owned (156 ) — (215 ) (507 ) Ending balance $ 308 $ 664 $ 308 $ 664 At June 30, 2017 and December 31, 2016 , the balance of OREO included no foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property without title. At June 30, 2017 and December 31, 2016 , the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceeds are in process was $1.5 million and $1.6 million , respectively.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures	Shares held by the ESOP were as follows: June 30, 2017 December 31, 2016 Allocated to participants 1,203,810 1,125,448 Distributed to participants (317,914 ) (313,223 ) Unearned — 831,852 Total ESOP shares 885,896 1,644,077 Fair value of unearned shares $ — $ 12,328

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock Option Activity	A summary of the activity in the stock option plan for 2017 and 2016 follows: Stock Options Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) Stock options outstanding at December 31, 2015 1,752,156 $ 12.30 1.48 $ 778 Stock options granted — — Stock options exercised — — Stock options outstanding at December 31, 2016 1,752,156 $ 12.30 0.48 $ 4,422 Stock options granted — — Stock options exercised (1,752,156 ) 12.30 Stock options outstanding at June 30, 2017 — $ — 0 $ — (1) Stock option aggregate intrinsic value represents the number of shares subject to options multiplied by the difference (if positive) in the closing market price of the common stock underlying the options on the date shown and the weighted average exercise price.

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Company's financial instruments measured at fair values	The following table sets forth the Company’s financial assets that were accounted for at fair value and are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value June 30, 2017 Securities: Certificates of deposit $ — $ 90,619 $ — $ 90,619 Equity mutual fund 501 — — 501 Mortgage-backed securities – residential — 13,629 — 13,629 Collateralized mortgage obligations – residential — 4,999 — 4,999 SBA-guaranteed loan participation certificates — 14 — 14 $ 501 $ 109,261 $ — $ 109,762 December 31, 2016 Securities: Certificates of deposit $ — $ 85,938 $ — $ 85,938 Equity mutual fund 499 — — 499 Mortgage-backed securities - residential — 15,184 — 15,184 Collateralized mortgage obligations – residential — 5,574 — 5,574 SBA-guaranteed loan participation certificates — 17 — 17 $ 499 $ 106,713 $ — $ 107,212
Schedule of Company's financial instruments measured on non recurring at fair values	The following table sets forth the Company’s assets that were measured at fair value on a non-recurring basis: Fair Value Measurement Using Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value June 30, 2017 Other real estate owned: One-to-four family residential real estate $ — $ — $ 102 $ 102 Multi-family mortgage — — 112 112 Nonresidential real estate — — 900 900 $ — $ — $ 1,114 $ 1,114 December 31, 2016 Impaired loans: Nonresidential real estate — — 234 234 $ — $ — $ 234 $ 234 Other real estate owned: One-to-four family residential real estate $ — $ — $ 1,282 $ 1,282 Nonresidential real estate — — 553 553 Land — — 47 47 $ — $ — $ 1,882 $ 1,882
Schedule of fair value quantitative information	The following table presents quantitative information, based on certain empirical data with respect to Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at June 30, 2017 : Fair Value Valuation Technique(s) Significant Unobservable Input(s) Range (Weighted Average) Other real estate owned: One-to-four family residential real estate $ 102 Sales comparison Discount applied to valuation 5.6% Multi-family mortgage 112 Sales comparison Comparison between sales and income approaches 1.0% Nonresidential real estate loans $ 900 Sales comparison Comparison between sales and income approaches -3.66% - 15.22% Other real estate owned $ 1,114
Carrying amount and estimated fair value of financial instruments	The carrying amount and estimated fair value of financial instruments are as follows: Fair Value Measurements at June 30, 2017 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 81,606 $ 9,835 $ 71,771 $ — $ 81,606 Securities 109,762 501 109,261 — 109,762 Loans receivable, net of allowance for loan losses 1,335,835 — 1,342,214 — 1,342,214 FHLBC and FRB stock 8,290 — — — N/A Accrued interest receivable 4,488 — 4,488 — 4,488 Financial liabilities Noninterest-bearing demand deposits $ 229,921 $ — $ 229,921 $ — $ 229,921 Savings deposits 160,544 — 160,544 — 160,544 NOW and money market accounts 591,700 — 591,700 — 591,700 Certificates of deposit 365,722 — 364,543 — 364,543 Borrowings 50,877 — 50,024 — 50,024 Accrued interest payable 166 — 166 — 166 Fair Value Measurements at December 31, 2016 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 96,684 $ 13,053 $ 83,631 $ — $ 96,684 Securities 107,212 499 106,713 — 107,212 Loans receivable, net of allowance for loan losses 1,312,952 — 1,322,713 234 1,322,947 FHLBC and FRB stock 11,650 — — — N/A Accrued interest receivable 4,381 — 4,381 — 4,381 Financial liabilities Noninterest-bearing demand deposits $ 249,539 $ — $ 249,539 $ — $ 249,539 Savings deposits 160,002 — 160,002 — 160,002 NOW and money market accounts 578,237 — 578,237 — 578,237 Certificates of deposit 351,612 — 350,593 — 350,593 Borrowings 51,069 — 50,015 — 50,015 Accrued interest payable 102 — 102 — 102

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders	$ 2,572	$ 831	$ 4,453	$ 2,735
Average common shares outstanding (shares)	18,330,972	19,827,581	18,784,934	19,991,561
Less:
Unearned ESOP shares (shares)	0	(694,773)	(298,813)	(706,941)
Unvested restricted stock shares (shares)	(940)	(2,690)	940	5,290
Weighted average common shares outstanding (shares)	18,330,032	19,130,118	18,485,181	19,279,330
Add - Net effect of dilutive stock options and unvested restricted stock	423	317	416	312
Weighted average diluted common shares outstanding (shares)	18,330,455	19,130,435	18,485,597	19,279,642
Basic earnings per common share (usd per share)	$ 0.14	$ 0.04	$ 0.24	$ 0.14
Diluted earnings per common share (usd per share)	$ 0.14	$ 0.04	$ 0.24	$ 0.14
Number of antidilutive stock options excluded from the diluted earnings per share calculation (shares)	0	536,459	0	536,459
Weighted average exercise price of anti-dilutive option shares (usd per share)	$ 0	$ 12.99	$ 0	$ 12.99

Securities - Fair Value of Secu

Securities - Fair Value of Securites (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	$ 109,236	$ 106,603
Available for sale securities, accumulated gross unrealized gain before tax	567	659
Available for sale securities, accumulated gross unrealized loss before tax	(41)	(50)
Total Fair value	109,762	107,212
Certificates of deposit [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	90,619	85,938
Available for sale securities, accumulated gross unrealized gain before tax	0	0
Available for sale securities, accumulated gross unrealized loss before tax	0	0
Total Fair value	90,619	85,938
Equity mutual fund [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	500	500
Available for sale securities, accumulated gross unrealized gain before tax	1	0
Available for sale securities, accumulated gross unrealized loss before tax	0	(1)
Total Fair value	501	499
Mortgage - backed securities - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	13,095	14,561
Available for sale securities, accumulated gross unrealized gain before tax	553	644
Available for sale securities, accumulated gross unrealized loss before tax	(19)	(21)
Total Fair value	13,629	15,184
Collateralized mortgage obligations - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	5,008	5,587
Available for sale securities, accumulated gross unrealized gain before tax	13	15
Available for sale securities, accumulated gross unrealized loss before tax	(22)	(28)
Total Fair value	4,999	5,574
SBA-guaranteed loan participation certificates [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	14	17
Available for sale securities, accumulated gross unrealized gain before tax	0	0
Available for sale securities, accumulated gross unrealized loss before tax	0	0
Total Fair value	$ 14	$ 17

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized cost and fair values of securities
Due in one year or less, amortized cost	$ 90,619
Due in one year or less, fair value	90,619
Total amortized cost	109,236	$ 106,603
Total Fair value	109,762	107,212
Equity mutual fund [Member]
Amortized cost and fair values of securities
Total amortized cost	500	500
Total Fair value	501	499
Mortgage - backed securities - residential [Member]
Amortized cost and fair values of securities
Total amortized cost	13,095	14,561
Total Fair value	13,629	15,184
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Total amortized cost	5,008	5,587
Total Fair value	4,999	5,574
SBA-guaranteed loan participation certificates [Member]
Amortized cost and fair values of securities
Total amortized cost	14	17
Total Fair value	$ 14	$ 17

Securities - Proceeds and Gross

Securities - Proceeds and Gross Gains (Losses) From Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Proceeds and Gross Gains (Losses) from Sale of Securities [Abstract]
Proceeds from Sale of Available-for-sale Securities, Equity			$ 0	$ 46
Available-for-sale Securities, Gross Realized Gains	$ 0	$ 0
Gain on Sale of Securities, Net			0	46
Proceeds from Sale of Available-for-sale Securities	$ 0	$ 0	$ 0	$ 46

Securities - Unrealized Losses

Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	$ 1,167	$ 5,377
12 Months or More, Fair Value	3,490	1,028
Fair Value, Total	4,657	6,405
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	(19)	(40)
12 Months or More, Unrealized Loss	(22)	(10)
Unrealized Loss, Total	(41)	(50)
Mortgage Backed Securities Residential [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	1,167	1,187
12 Months or More, Fair Value	0	0
Fair Value, Total	1,167	1,187
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	(19)	(21)
12 Months or More, Unrealized Loss	0	0
Unrealized Loss, Total	(19)	(21)
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	0	3,691
12 Months or More, Fair Value	3,490	1,028
Fair Value, Total	3,490	4,719
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	(18)
12 Months or More, Unrealized Loss	(22)	(10)
Unrealized Loss, Total	(22)	(28)
Equity Funds [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	0	499
12 Months or More, Fair Value	0	0
Fair Value, Total	0	499
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	(1)
12 Months or More, Unrealized Loss	0	0
Unrealized Loss, Total	$ 0	$ (1)

Securities - Narrative (Details

Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Proceeds and Gross Gains (Losses) from Sale of Securities [Abstract]
Proceeds from Sale of Available-for-sale Securities	$ 0	$ 0	$ 0	$ 46

Loans Receivable (Details)

Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans receivable
Total loans	$ 1,342,477		$ 1,319,416
Net deferred loan origination costs	1,480		1,663
Allowance for loan losses	(8,122)	$ (7,971)	(8,127)	$ (8,915)	$ (9,416)	$ (9,691)
Loans, net	1,335,835		1,312,952
One-to-four family residential real estate loans [Member]
Loans receivable
Total loans	115,659		135,218
Allowance for loan losses	(912)		(1,168)
Multi-family mortgage loans [Member]
Loans receivable
Total loans	555,691		542,887
Allowance for loan losses	(3,668)		(3,647)
Nonresidential real estate loans [Member]
Loans receivable
Total loans	177,436		182,152
Allowance for loan losses	(1,631)		(1,794)
Construction and land loans [Member]
Loans receivable
Total loans	2,265		1,302
Allowance for loan losses	(54)		(32)
Commercial loans [Member]
Loans receivable
Total loans	129,200		103,063
Allowance for loan losses	(1,012)		(733)
Commercial leases [Member]
Loans receivable
Total loans	360,397		352,539
Allowance for loan losses	(830)		(714)
Consumer loans [Member]
Loans receivable
Total loans	1,829		2,255
Allowance for loan losses	$ (15)		$ (39)

Loans Receivable - Loan Origina

Loans Receivable - Loan Origination and Risk Management (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 1,342,477	$ 1,319,416
Multi-family mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	555,691	542,887
Nonresidential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	177,436	182,152
Commercial leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 360,397	$ 352,539

Loans Receivable - Allowance fo

Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Allowance for loan losses and the loans receivable by portfolio segment
Net deferred loan origination costs	$ 1,480	$ 1,663
Loans, net	$ 1,335,835	$ 1,312,952

Loans Receivable - Activity in

Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 7,971	$ 9,416	$ 8,127	$ 9,691
Loans charged off	22	2,020	361	2,136
Recoveries	124	204	146	535
Net charge-off	(102)	1,816	215	1,601
Provision for (recovery of) loan losses	49	1,315	210	825
Ending balance	8,122	8,915	8,122	8,915
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,168
Loans charged off	(22)	(355)	(193)	(407)
Recoveries	79	6	85	87
Ending balance	912		912
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,647
Loans charged off	0	(6)	(3)	(51)
Recoveries	40	9	51	146
Ending balance	3,668		3,668
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,794
Loans charged off	0	(1,657)	(165)	(1,660)
Ending balance	1,631		1,631
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			32
Recoveries	0	0	0	35
Ending balance	54		54
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			733
Recoveries	5	28	10	105
Ending balance	1,012		1,012
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			714
Ending balance	830		830
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			39
Loans charged off	0	(2)	0	(18)
Recoveries	0	$ 0	0	$ 1
Ending balance	$ 15		$ 15

Loans Receivable - Loans Indivi

Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		$ 1,319,416	$ 1,342,477
Loans individually evaluated for impairment by class loans
Loan Balance		6,669
Recorded Investment		5,721
Partial Charge-off		1,005
Average Investment in Impaired Loans		4,178
Interest Income Recognized		120
Loan Balance (With an allowance recorded)		262
Recorded Investment (With an allowance recorded)		260
Partial Charge-offs (With an allowance recorded)		21
Allowance for loan losses (With an allowance recorded)		26	0
Average Investment in Impaired Loans (With an allowance recorded)		164
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0
Impaired Loan, Total		6,931	6,570
Recorded Investment, Total		5,981	5,678
Partial Charge-offs, Total		1,026	884
Average Investment in Impaired Loans, Total	$ 5,814	4,342
Interest Income Recognized, Total	26	120
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		8,101	8,122
Net deferred loan origination costs		1,663	1,480
Loans and Leases Receivable, Allowance	8,915	8,127	8,122	$ 7,971	$ 9,416	$ 9,691
Financing Receivable, Individually Evaluated for Impairment		6,009	5,710
Financing Receivable, Collectively Evaluated for Impairment		1,313,407	1,336,767
Loans, net		1,312,952	1,335,835
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		135,218	115,659
Loans individually evaluated for impairment by class loans
Loan Balance		5,379	5,071
Recorded Investment		4,548	4,163
Partial Charge-off		886	884
Average Investment in Impaired Loans	3,972	2,947
Interest Income Recognized	16	70
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,168	912
Loans and Leases Receivable, Allowance		1,168	912
Financing Receivable, Individually Evaluated for Impairment		4,962	4,745
Financing Receivable, Collectively Evaluated for Impairment		130,256	110,914
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		38,589	28,328
Loans individually evaluated for impairment by class loans
Loan Balance		503	527
Recorded Investment		386	551
Partial Charge-off		119	0
Average Investment in Impaired Loans	1,115	251
Interest Income Recognized	0	9
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		542,887	555,691
Loans individually evaluated for impairment by class loans
Loan Balance		787	972
Recorded Investment		787	964
Partial Charge-off		0	0
Average Investment in Impaired Loans	727	980
Interest Income Recognized	$ 10	41
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		3,647	3,668
Loans and Leases Receivable, Allowance		3,647	3,668
Financing Receivable, Individually Evaluated for Impairment		787	965
Financing Receivable, Collectively Evaluated for Impairment		542,100	554,726
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		299,183	294,203
Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		243,704	261,488
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		182,152	177,436
Loans individually evaluated for impairment by class loans
Loan Balance (With an allowance recorded)		262
Recorded Investment (With an allowance recorded)		260
Partial Charge-offs (With an allowance recorded)		21
Allowance for loan losses (With an allowance recorded)		26	0
Average Investment in Impaired Loans (With an allowance recorded)		164
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,768	1,631
Loans and Leases Receivable, Allowance		1,794	1,631
Financing Receivable, Individually Evaluated for Impairment		260	0
Financing Receivable, Collectively Evaluated for Impairment		181,892	177,436
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		946	1,957
Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		356	308
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		36,010	41,008
Commercial loans - other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		84,517	105,022
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		2,255	1,829
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		39	15
Loans and Leases Receivable, Allowance		39	15
Financing Receivable, Individually Evaluated for Impairment		0	0
Financing Receivable, Collectively Evaluated for Impairment		2,255	1,829
Construction And Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		1,302	2,265
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		32	54
Loans and Leases Receivable, Allowance		32	54
Financing Receivable, Individually Evaluated for Impairment		0	0
Financing Receivable, Collectively Evaluated for Impairment		1,302	2,265
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		103,063	129,200
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		733	1,012
Loans and Leases Receivable, Allowance		733	1,012
Financing Receivable, Individually Evaluated for Impairment		0	0
Financing Receivable, Collectively Evaluated for Impairment		103,063	129,200
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		352,539	360,397
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		714	830
Loans and Leases Receivable, Allowance		714	830
Financing Receivable, Individually Evaluated for Impairment		0	0
Financing Receivable, Collectively Evaluated for Impairment		352,539	360,397
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		$ 96,629	$ 87,331

Loans Receivable - Nonaccrual L

Loans Receivable - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Reserve For Uncollected Loan Interest	$ 238	$ 199
Unpaid Principal Balance	4,816	3,738
Recorded Investment	2,956	3,296
Loans Past Due Over 90 Days, still accruing	0	0
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	3,726	2,861
Recorded Investment	2,034	2,483
Loans Past Due Over 90 Days, still accruing	0	0
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	709	428
Recorded Investment	551	368
Loans Past Due Over 90 Days, still accruing	0	0
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	381	187
Recorded Investment	371	185
Loans Past Due Over 90 Days, still accruing	$ 0	0
Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance		262
Loans Past Due Over 90 Days, still accruing		0
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment		$ 260

Loans Receivable - Past Due Loa

Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 3,060	$ 6,239
Recorded Investment, Loans Not Past Due	1,331,433	1,308,023
Recorded investment, total	1,334,493	1,314,262
Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	51
Recorded Investment, Loans Not Past Due	256,938	269,430
Recorded investment, total	256,938	269,481
Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	105,426	84,988
Recorded investment, total	105,426	84,988
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1	0
Recorded Investment, Loans Not Past Due	1,836	2,263
Recorded investment, total	1,837	2,263
Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Loans Not Past Due	54,176	35,455
Recorded investment, total	54,176	35,455
Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	34,198	31,847
Recorded investment, total	34,198	31,847
Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	41,027	36,086
Recorded investment, total	41,027	36,086
Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	302	349
Recorded investment, total	302	349
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	1,962	950
Recorded investment, total	1,962	950
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	260
Recorded Investment, Loans Not Past Due	174,126	178,644
Recorded investment, total	174,126	178,904
Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	258,835	243,944
Recorded investment, total	258,835	243,944
Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	371	1,228
Recorded Investment, Loans Not Past Due	290,277	294,223
Recorded investment, total	290,648	295,451
One To Four Family Residential Real Estate Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	556	1,146
Recorded Investment, Loans Not Past Due	27,559	37,179
Recorded investment, total	28,115	38,325
One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	2,132	3,554
Recorded Investment, Loans Not Past Due	84,771	92,665
Recorded investment, total	86,903	96,219
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	3	2,304
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	51
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	605
Financing Receivables, 30 to 59 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	2	664
Financing Receivables, 30 to 59 Days Past Due [Member] | One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	984
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	101	888
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	439
Financing Receivables, 60 to 89 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	3	114
Financing Receivables, 60 to 89 Days Past Due [Member] | One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	98	335
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	2,956	3,047
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	260
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	371	184
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	551	368
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 2,034	$ 2,235

Loans Receivable - Troubled Deb

Loans Receivable - Troubled Debt Restructuring (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)loan	Jun. 30, 2016loan	Dec. 31, 2016USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings		$ 0		$ 0
Troubled Debt Restructurings
Financing receivable modifications		17,000		341,000
Troubled Debt Restructurings Value Of Decreased Interest Income		0
Financing Receivable, Modifications, Increase In Allowance For Loan And Leases Losses		$ 0
Number Of Loans Default Subsequent Modification | loan		1	3
Loans Removed from TDR Status		$ 324,000
Accrual Loans [Member]
Troubled Debt Restructurings
Financing receivable modifications		0		205,000
Non Accrual Loans [Member]
Troubled Debt Restructurings
Financing receivable modifications		17,000		136,000
One-to-four family residential real estate loans - non-owner occupied loans [Member] | Accrual Loans [Member]
Troubled Debt Restructurings
Financing receivable modifications		0		205,000
One-to-four family residential real estate loans - non-owner occupied loans [Member] | Non Accrual Loans [Member]
Troubled Debt Restructurings
Financing receivable modifications		17,000		136,000
One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Due To Extension Of Maturity Date	$ 63,000
Allowance for Loan and Lease Losses [Member]
Troubled Debt Restructurings
Valuation Allowances and Reserves, Balance		$ 0		$ 0

Loans Receivable - Modified Tro

Loans Receivable - Modified Troubled Debt Restructuring (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan	Jun. 30, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Increase In Allowance For Loan And Leases Losses			$ 0
Troubled Debt Restructurings Value Of Decreased Interest Income			0
Loans modified			133,000
Loans by class modified as TDRs
Financing Receivable, Modifications, Increase In Allowance For Loan And Leases Losses			$ 0
One-to-four family residential real estate loans [Member]
Loans by class modified as TDRs
Number of Loans | loan	0	1
Pre-Modification outstanding recorded investment	$ 0	$ 63,000
Post-Modification outstanding recorded investment	$ 0	63,000
Due to extension of maturity date		63,000
Due to permanent reduction in recorded investment		0
Total		$ 63,000

Loans Receivable - Troubled D41

Loans Receivable - Troubled Debt Restructuring - Payment Defaults (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Increase In Allowance For Loan And Leases Losses			$ 0
Financing Receivable, Modifications, Increase In Allowance For Loan And Leases Losses			$ 0
Loans by class modified as TDRs with payment default
Number of loans | loan			1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 17,000	$ 104,000
One-to-four family residential real estate loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Pre Modification Recorded Investment	$ 0	$ 63,000
Loans by class modified as TDRs with payment default
Financing Receivable Post Modification Recorded Investment	$ 0	$ 63,000
Number Of Loans | loan	0	1

Loans Receivable - Credit Quali

Loans Receivable - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 3,060	$ 6,239
Financing Receivable Credit Quality Indicators
Total loans	1,342,477	1,319,416
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,132	3,554
Financing Receivable Credit Quality Indicators
Total loans	115,659	135,218
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	87,331	96,629
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	556	1,146
Financing Receivable Credit Quality Indicators
Total loans	28,328	38,589
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	371	1,228
Financing Receivable Credit Quality Indicators
Total loans	555,691	542,887
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	294,203	299,183
Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	261,488	243,704
Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	177,436	182,152
Construction loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	1,957	946
Land loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	308	356
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	41,008	36,010
Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	34,030	31,681
Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans
Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	54,162	35,372
Commercial loans - other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	105,022	84,517
Commercial Leases - Investment Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	51
Financing Receivable Credit Quality Indicators
Total loans	255,375	268,022
Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,829	2,255
Nonaccrual [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,956	3,302
Nonaccrual [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,030	2,486
Nonaccrual [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	552	369
Nonaccrual [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	374	187
Nonaccrual [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	260
Nonaccrual [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,970	3,629
Substandard [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	324	629
Substandard [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	40	41
Substandard [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	487	1,048
Substandard [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	106	1,845
Substandard [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	7	66
Substandard [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,000	0
Substandard [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	6	0
Pass [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,337,551	1,311,402
Pass [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	84,977	93,514
Pass [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	27,736	38,179
Pass [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	293,342	297,826
Pass [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	261,488	243,704
Pass [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	177,330	180,047
Pass [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,957	946
Pass [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	308	356
Pass [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	41,001	35,944
Pass [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	34,030	30,881
Pass [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	53,162	35,372
Pass [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	105,022	84,356
Pass [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	255,375	268,022
Pass [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,823	2,255
Special Mention [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	1,083
Special Mention [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	122
Special Mention [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	800
Special Mention [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	161
Special Mention [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	3	2,304
Financing Receivables, 30 to 59 Days Past Due [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	984
Financing Receivables, 30 to 59 Days Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	2	664
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	605
Financing Receivables, 30 to 59 Days Past Due [Member] | Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Land loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 51

Loans Receivable - Narrative (D

Loans Receivable - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserve For Uncollected Loan Interest	$ 238,000	$ 199,000
Financing receivable modifications	17,000	341,000
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings	0	0
Troubled Debt Restructurings Value Of Decreased Interest Income	0
Financing Receivable, Modifications, Increase In Allowance For Loan And Leases Losses	0
Loans modified	133,000
Allowance for Loan and Lease Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation of reserves allocation	$ 0	$ 0

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Mortgage Loans in Process of Foreclosure, Amount	$ 1,500		$ 1,500			$ 1,600
Other Real Estate Owned At Carrying Value	4,896	$ 5,373	4,896	$ 5,373	$ 5,301	3,895	$ 5,629	$ 7,011
Real Estate Owned, Valuation Allowance, Amounts Applied	(156)	0	(215)	(507)
Real Estate Owned, Valuation Allowance, Valuation Increase	54	10	74	129
Real Estate Owned, Valuation Allowance	(308)	(664)	(308)	(664)	$ (410)	(449)	$ (654)	$ (1,042)
Other Real Estate, Disposals	(351)	(302)	(861)	(1,630)
Other Real Estate, Valuation Adjustments	(54)	(10)	(74)	(129)
Other Real Estate, Additions	0	$ 56	1,936	$ 121
Other real estate owned at carrying value before valuation allowance	5,204		5,204			4,344
Multi Family Mortgage Loans [Member]
Other Real Estate Owned At Carrying Value	357		357			370
Real Estate Owned, Valuation Allowance	(4)		(4)			0
Other real estate owned at carrying value before valuation allowance	361		361			370
One to Four Family Residential Real Estate Loans [Member]
Other Real Estate Owned At Carrying Value	1,946		1,946			1,565
Real Estate Owned, Valuation Allowance	(51)		(51)			(137)
Other real estate owned at carrying value before valuation allowance	1,997		1,997			1,702
Nonresidential Real Estate [Member]
Other Real Estate Owned At Carrying Value	1,736		1,736			1,066
Real Estate Owned, Valuation Allowance	(166)		(166)			(105)
Other real estate owned at carrying value before valuation allowance	1,902		1,902			1,171
Land [Member]
Other Real Estate Owned At Carrying Value	857		857			894
Real Estate Owned, Valuation Allowance	(87)		(87)			(207)
Other real estate owned at carrying value before valuation allowance	$ 944		$ 944			$ 1,101

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Available-for-sale Securities Pledged as Collateral	$ 4,100	$ 4,700
Carrying Value of Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Deposits Received for Securities Loaned	877	1,069
Federal Home Loan Bank Advances [Member] | Period One [Member]
Federal Home Loan Bank, Advances [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 50,000	$ 50,000

Employee Benefit Plans - Employ

Employee Benefit Plans - Employee Stock Ownership Plan (Details) - USD ($)	Mar. 29, 2017	Jun. 30, 2005	Jun. 30, 2017	Dec. 31, 2016
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
ESOP compensation expense			$ 1,100,000	$ 1,300,000
Loan receivable from ESOP		$ 19,600,000
ESOP issued price (usd per share)		$ 10
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated to participants (shares)			1,203,810	1,125,448
Distributed to participants			(317,914)	(313,223)
Unearned (shares)			0	831,852
Total ESOP shares (shares)	78,362		885,896	1,644,077
Fair value of unearned shares			$ 0	$ 12,328,000
Common Stock [Member]
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
Repayments of debt, shares issued (shares)	753,490
ESOP shares purchased (shares)		1,957,300
Share Acquisition Loan [Member]
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
Loans payable			$ 0	$ 10,800,000

Equity Incentive Plans - Narrat

Equity Incentive Plans - Narrative (Details) - USD ($) $ in Thousands	Jun. 27, 2006	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding		0	1,752,156	1,752,156
Share-based compensation expense		$ 0	$ 979
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		1,752,156
Share-based Compensation Arrangement by Share-based Payment Award, Net Settlement Share Issuance		280,554
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		198,026
Share-based Compensation Arrangement by Share-based Payment Award, Shares Withheld For Taxes		82,528
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	3,425,275
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

Equity Incentive Plans - Schedu

Equity Incentive Plans - Schedule of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Outstanding	0	1,752,156	1,752,156
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		5 months 23 days	1 year 5 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value			$ 778
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 0	$ 4,422
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	(1,752,156)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0

Fair Value - Financial Assets A

Fair Value - Financial Assets Accounted for at Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			$ 234
Schedule of Company's financial instruments measured at fair values
Total Fair value	$ 109,762		107,212
Real Estate Acquired Through Foreclosure Fair Value	1,114		1,882
Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	90,619		85,938
Equity Funds [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	501		499
Residential Mortgage Backed Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	13,629		15,184
Collateralized Debt Obligations [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	4,999		5,574
SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	14		17
Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			234
Schedule of Company's financial instruments measured at fair values
Total Fair value	109,762		107,212
Real Estate Acquired Through Foreclosure Fair Value	1,114		1,882
Nonrecurring [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	90,619		85,938
Nonrecurring [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	501		499
Nonrecurring [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	13,629		15,184
Nonrecurring [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	4,999		5,574
Nonrecurring [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	14		17
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Schedule of Company's financial instruments measured at fair values
Total Fair value	501		499
Real Estate Acquired Through Foreclosure Fair Value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Schedule of Company's financial instruments measured at fair values
Total Fair value	109,261		106,713
Real Estate Acquired Through Foreclosure Fair Value	0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			234
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Real Estate Acquired Through Foreclosure Fair Value	1,114		1,882
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
One to Four Family Residential Real Estate Loans [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			1,282
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			1,282
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			0
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			0
Commercial Real Estate [Member] | Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			234
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	900		553
Commercial Real Estate [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	0		0
Commercial Real Estate [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	0		0
Commercial Real Estate [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	$ 900
Nonresidential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loan Fair Value			234
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			553
Land Loans [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			47
Land Loans [Member] | Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			47
Land Loans [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			0
Land Loans [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			$ 0
Sales Comparison Valuation Technique [Member] | One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description		Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description		Discount applied to valuation
Sales Comparison Valuation Technique [Member] | Commercial Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description	Sales comparison	Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description	Comparison between sales and income approaches	Comparison between sales and income approaches
Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description		Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description		Comparison between sales and income approaches
Sales Comparison Valuation Technique [Member] | Land Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description		Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description		Discount applied to valuation

Fair Value - Assets Measured at

Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Loans Carrying Amount					$ 260,000
Impaired Loans Valuation Allowance					26,000
allowance for loan losses, specific reserve, increase or decrease			$ (26,000)	$ 37,000
Other Real Estate	$ 1,293,000		1,293,000		2,300,000
Real Estate Owned, Valuation Allowance, Component	179,000		179,000		434,000
Fair Value, Impaired loans					234,000
Fair Value, Other real estate owned	1,114,000		1,114,000		1,882,000
Other Real Estate Owned Write Downs	54,000	$ 10,000	74,000	$ 129,000
One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned					1,282,000
Nonresidential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					234,000
Fair Value, Other real estate owned					553,000
Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					234,000
Fair Value, Other real estate owned	1,114,000		1,114,000		1,882,000
Nonrecurring [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned					1,282,000
Nonrecurring [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					234,000
Fair Value, Other real estate owned	900,000		900,000		553,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					0
Fair Value, Other real estate owned	0		0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned					0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					0
Fair Value, Other real estate owned	0		0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					0
Fair Value, Other real estate owned	0		0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned					0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					0
Fair Value, Other real estate owned	0		0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Impaired loans					234,000
Fair Value, Other real estate owned	1,114,000		1,114,000		$ 1,882,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	$ 900,000		$ 900,000
Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description				Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description				Discount applied to valuation
Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description				Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description				Comparison between sales and income approaches
Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description			Sales comparison	Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description			Comparison between sales and income approaches	Comparison between sales and income approaches
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate					20.04%
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					4.58%
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					31.60%
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate					8.62%
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					(3.22%)
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					5.74%
Weighted Average [Member] | impaired loans [Member] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			3.60%		(10.20%)
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate					11.90%
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					3.77%
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments					25.20%

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 81,606	$ 96,684	$ 85,557	$ 59,377
Financial assets
Securities, carrying amount	109,762	107,212
Loans receivable, net of allowance for loan losses, carrying amounts	1,335,835	1,312,952
FHLBC stock, carrying amount	8,290	11,650
Accrued interest receivable, carrying amount	4,488	4,381
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	109,762	107,212
Loans Receivable, Fair Value Disclosure	1,342,214	1,322,947
Accounts Receivable, Fair Value Disclosure	4,488	4,381
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	81,606	96,684
Demand Deposit Accounts Fair Value Disclosure	229,921	249,539
Deposits Savings Deposits Fair Value Disclosure	160,544	160,002
Now Money Market Accounts Fair Value Disclosure	591,700	578,237
Certificates Of Deposit Fair Value Disclosure	364,543	350,593
Short Term Borrowings Fair Value Disclosure	50,024	50,015
Accrued Liabilities, Fair Value Disclosure	166	102
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure		0
Accounts Receivable, Fair Value Disclosure		0
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	9,835	13,053
Demand Deposit Accounts Fair Value Disclosure		0
Deposits Savings Deposits Fair Value Disclosure		0
Now Money Market Accounts Fair Value Disclosure		0
Certificates Of Deposit Fair Value Disclosure		0
Short Term Borrowings Fair Value Disclosure		0
Accrued Liabilities, Fair Value Disclosure		0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	109,261	106,713
Loans Receivable, Fair Value Disclosure	1,342,214	1,322,713
Accounts Receivable, Fair Value Disclosure	4,488	4,381
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	71,771	83,631
Demand Deposit Accounts Fair Value Disclosure	229,921	249,539
Deposits Savings Deposits Fair Value Disclosure	160,544	160,002
Now Money Market Accounts Fair Value Disclosure	591,700	578,237
Certificates Of Deposit Fair Value Disclosure	364,543	350,593
Short Term Borrowings Fair Value Disclosure		50,015
Accrued Liabilities, Fair Value Disclosure	166	102
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure	0	234
Reported Value Measurement [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	81,606	96,684
Financial assets
Securities, carrying amount	109,762	107,212
Loans receivable, net of allowance for loan losses, carrying amounts	1,335,835	1,312,952
FHLBC stock, carrying amount	8,290	11,650
Accrued interest receivable, carrying amount	4,488	4,381
Financial liabilities
Demand Deposit Accounts	229,921	249,539
Deposits, Savings Deposits	160,544	160,002
Now Money Market Accounts	591,700	578,237
Certificates of Deposit, at Carrying Value	365,722	351,612
Short-term Debt	50,877	51,069
Accrued Interest Payable	166	102
Reported Value Measurement [Member] | Level 2 [Member]
Financial liabilities
Short-term Debt	50,024
Equity Funds [Member]
Financial assets
Securities, carrying amount	$ 501	$ 499

Uncategorized Items - bfin-2017

Label	Element	Value
Retained Earnings [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	$ 831,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	$ 2,572,000