BankFinancial (BFIN) 10-Q 30 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 26, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019
Entity Registrant Name	BankFinancial CORP
Entity Central Index Key	0001303942
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		15,517,699

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from other financial institutions	$ 12,016	$ 13,805
Interest-bearing deposits in other financial institutions	66,206	84,399
Cash and cash equivalents	78,222	98,204
Securities, at fair value	83,240	88,179
Loans receivable, net of allowance for loan losses: March 31, 2019, $8,354 and December 31, 2018, $8,470	1,306,475	1,323,793
Other real estate owned, net	921	1,226
Stock in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB), at cost	8,026	8,026
Premises and equipment, net	24,992	25,205
Accrued interest receivable	5,411	4,952
Bank-owned life insurance	18,839	18,809
Deferred taxes	5,023	6,235
Other assets	13,871	10,696
Total assets	1,545,020	1,585,325
Deposits
Noninterest-bearing	222,328	230,041
Interest-bearing	1,104,418	1,122,443
Total deposits	1,326,746	1,352,484
Borrowings	16,106	21,049
Advance payments by borrowers for taxes and insurance	9,134	10,531
Accrued interest payable and other liabilities	16,814	14,111
Total liabilities	1,368,800	1,398,175
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; 15,644,499 shares issued at March 31, 2019 and 16,481,514 issued at December 31, 2018	157	165
Additional paid-in capital	117,715	130,547
Retained earnings	58,072	56,167
Accumulated other comprehensive income	276	271
Total stockholders’ equity	176,220	187,150
Total liabilities and stockholders’ equity	$ 1,545,020	$ 1,585,325

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 8,354	$ 8,470
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	15,644,499	16,481,514

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and dividend income
Loans, including fees	$ 15,352	$ 13,820
Securities	602	464
Other	572	464
Total interest income	16,526	14,748
Interest expense
Deposits	3,221	1,525
Borrowings	86	202
Borrowings	3,307	1,727
Net interest income	13,219	13,021
Recovery of loan losses	(87)	(258)
Net interest income after recovery of loan losses	13,306	13,279
Noninterest income
Income from product and service	930	978
Loan servicing fees	23	70
Mortgage brokerage and banking fees	28	71
Gain on sale of equity securities	295	0
Loss on disposal of other assets	(19)	0
Trust and insurance commissions and annuities income	205	213
Earnings on bank-owned life insurance	30	66
Other	132	141
Total noninterest income	1,624	1,539
Noninterest expense
Compensation and benefits	5,703	5,322
Office occupancy and equipment	1,845	1,731
Advertising and public relations	161	143
Information technology	692	641
Supplies, telephone, and postage	399	333
Amortization of intangibles	20	122
Nonperforming asset management	54	202
Operations of other real estate owned	(44)	161
FDIC insurance premiums	108	119
Other	1,160	1,185
Total noninterest expense	10,098	9,959
Income before income taxes	4,832	4,859
Income tax expense	1,281	1,300
Net income	$ 3,551	$ 3,559
Basic earnings per common share (usd per share)	$ 0.22	$ 0.20
Diluted earnings per common share (usd per share)	$ 0.22	$ 0.20
Weighted average common shares outstanding (shares)	16,202,303	17,930,639
Diluted weighted average common shares outstanding (shares)	16,202,303	17,931,100

Consolidated Statements Compreh

Consolidated Statements Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 3,551	$ 3,559
Unrealized holding gain (loss) arising during the period	6	(104)
Tax effect	(1)	22
Net of tax	5	(82)
Comprehensive income	$ 3,556	$ 3,477

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2017	$ 197,634	$ 179	$ 153,811	$ 43,274	$ 370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,559			3,559
Other comprehensive loss, net of tax	(82)				(82)
Repurchase and retirement of common stock	(1,323)	(1)	(1,322)
Cash dividends declared on common stock	(1,436)			(1,436)
Ending Balance at Mar. 31, 2018	198,352	178	152,489	45,397	288
Beginning Balance at Dec. 31, 2018	187,150	165	130,547	56,167	271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,551			3,551
Other comprehensive loss, net of tax	5				5
Repurchase and retirement of common stock	(12,840)	(8)	(12,832)
Cash dividends declared on common stock	(1,646)			(1,646)
Ending Balance at Mar. 31, 2019	$ 176,220	$ 157	$ 117,715	$ 58,072	$ 276

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock (in dollars per share)	$ 0.1	$ 0.08
Repurchase and retirement of common stock (in shares)	837,015	82,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 3,551	$ 3,559
Adjustments to reconcile to net income to net cash from operating activities
Recovery of loan losses	(87)	(258)
Depreciation and amortization	816	916
Amortization of right of use asset	212	0
Amortization of premiums and discounts on securities and loans	1	3
Amortization of core deposit intangible	20	122
Amortization of servicing assets	17	27
Net change in net deferred loan origination costs	7	36
(Gain) loss on sale of other real estate owned	(95)	21
Gain on sale of equity securities	(295)	0
Loss on disposal of other assets	(19)	0
Other real estate owned valuation adjustments	0	25
Net change in:
Accrued interest receivable	(459)	(281)
Earnings on bank owned life insurance	(30)	(66)
Other assets	656	2,037
Accrued interest payable and other liabilities	(3,991)	(2,431)
Net cash from operating activities	342	3,710
Securities
Proceeds from maturities	30,974	27,499
Proceeds from principal repayments	449	1,030
Proceeds from sale of equity securities	3,722	0
Purchases of securities	(26,479)	(37,923)
Loans receivable
Principal payments on loans receivable	231,500	226,439
Originated for investment	(214,175)	(189,659)
Proceeds from sale of other real estate owned	446	713
Purchase of premises and equipment, net	(197)	(150)
Net cash from investing activities	26,240	27,949
Cash flows from financing activities
Net change in deposits	(25,738)	(62,044)
Net change in borrowings	(4,943)	215
Net change in advance payments by borrowers for taxes and insurance	(1,397)	(2,087)
Payments for Repurchase of Common Stock	(12,840)	(1,323)
Payments of Ordinary Dividends, Common Stock	(1,646)	(1,436)
Net cash used in financing activities	(46,564)	(66,675)
Net change in cash and cash equivalents	(19,982)	(35,016)
Beginning cash and cash equivalents	98,204	127,592
Ending cash and cash equivalents	78,222	92,576
Supplemental disclosures of cash flow information:
Interest paid	3,453	1,694
Income taxes paid	375	43
Loans transferred to other real estate owned	46	562
Recording of right of use asset in exchange for lease obligations	$ 6,694	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2019
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, is the owner of all of the issued and outstanding capital stock of BankFinancial, NA (the “Bank”). The interim unaudited consolidated financial statements include the accounts and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BFIN Asset Recovery Company, LLC (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. Such adjustments are the only adjustments reflected in the accompanying financial statements. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three month period ended March 31, 2019 is not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2019 or for any other period. 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. Lease Accounting: The Company adopted FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), including the adoption of the practical expedients, on January 1, 2019. Lessees are required to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. The Company recorded assets and liabilities of $6.7 million as a result of recording additional lease contracts where the Company is lessee. The Company did not restate comparative periods. The right of use asset is included in other assets and the lease obligations is included in other liabilities in the accompanying consolidated statements of financial condition. Other Intangible Assets : Intangible assets acquired in a purchase business combination with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible assets (“CDI”), are recognized at the time of acquisition based on valuations prepared by independent third parties or other estimates of fair value. In preparing such valuations, variables such as deposit servicing costs, attrition rates, and market discount rates are considered. CDI assets are amortized to expense over their useful lives. CDI were $82,000 and $102,000 at March 31, 2019 and December 31, 2018 , respectively, and are included in other assets in the accompanying consolidated statements of financial condition. 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, 2018 , as filed with the Securities and Exchange Commission. Newly Issued Not Yet Effective Accounting Standards 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; however, we do not anticipate early application of the standard. In 2018, we contracted with a third-party vendor for CECL-compliant software. As of March 31, 2019, we concluded initial testing and determined that we have sufficient loan data to support the requirements of the pronouncement. We are now evaluating CECL-compliant loss methodologies to determine the correlation to historical loan performance by portfolio segment. We are presently unable to determine the impact of ASU 2016-13 to our financial statements. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“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. We early adopted the pronouncement and adoption of the new pronouncement was immaterial to the consolidated financial statements.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Amounts reported in earnings 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 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 2019 2018 Net income available to common stockholders $ 3,551 $ 3,559 Average common shares outstanding 16,202,303 17,931,579 Less - Unvested restricted stock shares — (940 ) Weighted average common shares outstanding 16,202,303 17,930,639 Add - Net effect of dilutive unvested restricted stock — 461 Diluted weighted average common shares outstanding 16,202,303 17,931,100 Basic earnings per common share $ 0.22 $ 0.20 Diluted earnings per common share $ 0.22 $ 0.20

Securities (Notes)

Securities (Notes)	3 Months Ended
	Mar. 31, 2019
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 Available-for-Sale Securities March 31, 2019 Certificates of deposit $ 69,011 $ — $ — $ 69,011 Municipal securities 508 3 — 511 Mortgage-backed securities - residential 9,828 401 (22 ) 10,207 Collateralized mortgage obligations - residential 3,516 5 (10 ) 3,511 $ 82,863 $ 409 $ (32 ) $ 83,240 December 31, 2018 Certificates of deposit $ 73,507 $ — $ — $ 73,507 Municipal securities 509 — — 509 Mortgage-backed securities - residential 10,116 400 (38 ) 10,478 Collateralized mortgage obligations - residential 3,676 11 (2 ) 3,685 $ 87,808 $ 411 $ (40 ) $ 88,179 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. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Equity Investments (1) December 31, 2018 Visa Class B shares $ — $ 3,427 $ — $ 3,427 (1) Equity investments are included in Other Assets in the Consolidated Statements of Financial Condition. 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. March 31, 2019 Amortized Cost Fair Value Due in one year or less $ 69,011 $ 69,011 Due after one year through five years 508 511 69,519 69,522 Mortgage-backed securities - residential 9,828 10,207 Collateralized mortgage obligations - residential 3,516 3,511 $ 82,863 $ 83,240 Investment securities available-for-sale with carrying values of $2.6 million and $2.7 million at March 31, 2019 and December 31, 2018 , respectively, were pledged as collateral on customer repurchase agreements and for other purposes as required or permitted by law. Sales of equity securities were as follows: Three Months Ended 2019 2018 Proceeds $ 3,722 $ — Gross gains 295 — Gross 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 March 31, 2019 Mortgage-backed securities - residential $ — $ — $ 910 $ (22 ) $ 910 $ (22 ) Collateralized mortgage obligations - residential 1,644 (4 ) 1,275 (6 ) 2,919 (10 ) $ 1,644 $ (4 ) $ 2,185 $ (28 ) $ 3,829 $ (32 ) December 31, 2018 Mortgage-backed securities - residential $ — $ — $ 904 $ (38 ) $ 904 $ (38 ) Collateralized mortgage obligations - residential — — 1,729 (2 ) 1,729 (2 ) $ — $ — $ 2,633 $ (40 ) $ 2,633 $ (40 ) 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 March 31, 2019 , 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. The Bank, as a member of Visa USA, received 51,404 unrestricted shares of Visa, Inc. Class B common stock in connection with Visa, Inc.’s initial public offering in 2007. The retroactive responsibility plan obligates all former Visa USA members to indemnify Visa USA, in proportion to their equity interests in Visa USA, for certain litigation losses and expenses, including settlement expenses, for the lawsuits covered by the retrospective responsibility plan. Due to the restrictions that the retrospective responsibility plan imposes on the Company’s Visa, Inc. Class B shares, the Company had not recorded the Class B shares as an asset. The Bank sold 25,702 shares of Visa Class B common stock in the fourth quarter of 2018 and recorded a gain of $3.6 million . For equity investments without readily determinable fair values, when an orderly transaction for the identical or similar investment of the same issuer is identified, we use the valuation techniques permitted under ASC 820 Fair Value to evaluate the observed transaction(s) and adjust the fair value of the equity investment. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the 25,702 Visa Class B shares that the Company owned as of December 31, 2018 were recorded at $3.4 million in other assets with a corresponding gain. The Bank sold the remaining 25,702 shares of Visa Class B common stock in the first quarter of 2019 and recorded a gain of $295,000 .

Loans Receivable (Notes)

Loans Receivable (Notes)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans Receivable	Loans receivable are as follows: March 31, 2019 December 31, 2018 One-to-four family residential real estate $ 66,833 $ 70,371 Multi-family mortgage 634,328 619,870 Nonresidential real estate 148,601 152,442 Construction and land 145 172 Commercial loans 172,264 187,406 Commercial leases 289,750 299,394 Consumer 1,846 1,539 1,313,767 1,331,194 Net deferred loan origination costs 1,062 1,069 Allowance for loan losses (8,354 ) (8,470 ) Loans, net $ 1,306,475 $ 1,323,793 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 March 31, 2019 One-to-four family residential real estate $ — $ 649 $ 649 $ 2,365 $ 64,468 $ 66,833 Multi-family mortgage — 4,079 4,079 646 633,682 634,328 Nonresidential real estate — 1,487 1,487 242 148,359 148,601 Construction and land — 3 3 — 145 145 Commercial loans — 1,422 1,422 354 171,910 172,264 Commercial leases — 690 690 — 289,750 289,750 Consumer — 24 24 — 1,846 1,846 $ — $ 8,354 $ 8,354 $ 3,607 $ 1,310,160 1,313,767 Net deferred loan origination costs 1,062 Allowance for loan losses (8,354 ) Loans, net $ 1,306,475 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, 2018 One-to-four family residential real estate $ — $ 699 $ 699 $ 2,218 $ 68,153 $ 70,371 Multi-family mortgage — 3,991 3,991 653 619,217 619,870 Nonresidential real estate 27 1,449 1,476 270 152,172 152,442 Construction and land — 4 4 — 172 172 Commercial loans — 1,517 1,517 — 187,406 187,406 Commercial leases — 755 755 — 299,394 299,394 Consumer — 28 28 — 1,539 1,539 $ 27 $ 8,443 $ 8,470 $ 3,141 $ 1,328,053 1,331,194 Net deferred loan origination costs 1,069 Allowance for loan losses (8,470 ) Loans, net $ 1,323,793 Activity in the allowance for loan losses is as follows: Three Months Ended 2019 2018 Beginning balance $ 8,470 $ 8,366 Loans charged off: One-to-four family residential real estate (23 ) (97 ) Nonresidential real estate (28 ) — Consumer (5 ) — (56 ) (97 ) Recoveries: One-to-four family residential real estate 17 99 Multi-family mortgage 8 8 Commercial loans 2 223 27 330 Net (charge-offs) recoveries (29 ) 233 Recovery of loan losses (87 ) (258 ) Ending balance $ 8,354 $ 8,341 Impaired loans Several of the following disclosures are presented by “recorded investment,” which the FASB defines as “the amount of the investment in a loan, which is not net of a valuation allowance, but which does reflect any direct write-down of the investment.” The following represents the components of recorded investment: Loan principal balance Less unapplied payments Plus negative unapplied balance Less escrow balance Plus negative escrow balance Plus unamortized net deferred loan costs Less unamortized net deferred loan fees Plus unamortized premium Less unamortized discount Less previous charge-offs Plus recorded accrued interest Less reserve for uncollected interest = Recorded investment The following tables present loans individually evaluated for impairment by class of loans: Three months ended Loan Balance Recorded Investment Partial Charge-off Allowance for Loan Losses Allocated Average Investment in Impaired Loans Interest Income Recognized March 31, 2019 With no related allowance recorded: One-to-four family residential real estate $ 2,896 $ 2,303 $ 561 $ — $ 2,230 $ 15 One-to-four family residential real estate - non-owner occupied 86 32 56 — 43 — Multi-family mortgage - Illinois 645 649 — — 651 9 Nonresidential real estate 356 242 121 — 61 — Commercial loans - health care 354 354 — — 89 6 $ 4,337 $ 3,580 $ 738 $ — $ 3,074 $ 30 Year ended December 31, 2018 Loan Balance Recorded Investment Partial Charge-off Allowance for Loan Losses Allocated Average Investment in Impaired Loans Interest Income Recognized December 31, 2018 With no related allowance recorded: One-to-four family residential real estate $ 2,751 $ 2,155 $ 575 $ — $ 3,274 $ 41 One-to-four family residential real estate - non-owner occupied 86 46 43 — 95 — Multi-family mortgage - Illinois 654 653 — — 795 39 3,491 2,854 $ 618 — 4,164 80 With an allowance recorded - Nonresidential real estate 356 270 93 27 21 — $ 3,847 $ 3,124 $ 711 $ 27 $ 4,185 $ 80 Nonaccrual Loans 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 March 31, 2019 One-to-four family residential real estate $ 1,089 $ 812 $ — One-to-four family residential real estate – non-owner occupied 86 32 — Nonresidential real estate 356 242 — Commercial loans – health care 354 354 — $ 1,885 $ 1,440 $ — December 31, 2018 One-to-four family residential real estate $ 2,167 $ 1,162 $ — One-to-four family residential real estate – non-owner occupied 270 78 — Nonresidential real estate 356 270 — $ 2,793 $ 1,510 $ — Nonaccrual loans and impaired loans are defined differently. Some loans may be included in both categories, and some loans 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 $40,000 and $38,000 at March 31, 2019 and December 31, 2018 , 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. Past Due Loans The following tables present the aging of the recorded investment of loans at March 31, 2019 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 $ 559 $ 35 $ 804 $ 1,398 $ 52,595 $ 53,993 One-to-four family residential real estate loans – non-owner occupied 141 147 33 321 12,141 12,462 Multi-family mortgage - Illinois — — — — 273,114 273,114 Multi-family mortgage - Other — — — — 357,588 357,588 Nonresidential real estate 283 — 242 525 146,566 147,091 Land — — — — 142 142 Commercial loans: Regional commercial banking — — — — 37,719 37,719 Health care — — — — 85,048 85,048 Direct commercial lessor — — — — 49,975 49,975 Commercial leases: Investment rated commercial leases 336 — — 336 158,095 158,431 Other commercial leases 37 — — 37 133,324 133,361 Consumer 6 6 — 12 1,847 1,859 $ 1,362 $ 188 $ 1,079 $ 2,629 $ 1,308,154 $ 1,310,783 The following tables present the aging of the recorded investment of loans at December 31, 2018 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 $ 1,380 $ 637 $ 1,162 $ 3,179 $ 53,820 $ 56,999 One-to-four family residential real estate loans – non-owner occupied 387 10 78 475 12,460 12,935 Multi-family mortgage - Illinois 458 — — 458 275,283 275,741 Multi-family mortgage - Other — — — — 340,470 340,470 Nonresidential real estate — 270 — 270 149,271 149,541 Land — — — — 169 169 Commercial loans: Regional commercial banking — — — — 39,712 39,712 Health care — — — — 85,418 85,418 Direct commercial lessor — — — — 62,719 62,719 Commercial leases: Investment rated commercial leases 505 — — 505 166,713 167,218 Other commercial leases — — — — 133,958 133,958 Consumer 40 4 — 44 1,508 1,552 $ 2,770 $ 921 $ 1,240 $ 4,931 $ 1,321,501 $ 1,326,432 Troubled Debt Restructurings 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 experiencing financial difficulties 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 March 31, 2019 and December 31, 2018 . No specific valuation reserves were allocated to those loans at March 31, 2019 and December 31, 2018 . 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: March 31, 2019 December 31, 2018 One-to-four family residential real estate - nonaccrual $ 17 $ 17 During the three months ended March 31, 2019 and 2018 , there were no loans modified and classified as TDRs. During the three months ended March 31, 2019 and 2018 , there were no TDR loans that subsequently defaulted within twelve months of their modification. A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms. 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. Credit Quality Indicators 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. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered “Pass” rated loans. As of March 31, 2019 , 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 $ 52,783 $ 359 $ 347 $ 813 $ 54,302 One-to-four family residential real estate loans – non-owner occupied 12,293 168 37 33 12,531 Multi-family mortgage - Illinois 274,368 — 214 — 274,582 Multi-family mortgage - Other 359,746 — — — 359,746 Nonresidential real estate 147,984 280 95 242 148,601 Land 145 — — — 145 Commercial loans: Regional commercial banking 32,335 5,304 — — 37,639 Health care 81,527 — 3,033 354 84,914 Direct commercial lessor 49,711 — — — 49,711 Commercial leases: Investment rated commercial leases 156,569 646 — — 157,215 Other commercial leases 132,535 — — — 132,535 Consumer 1,828 9 9 — 1,846 $ 1,301,824 $ 6,766 $ 3,735 $ 1,442 $ 1,313,767 As of December 31, 2018 , 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 $ 55,353 $ 495 $ 328 $ 993 $ 57,169 One-to-four family residential real estate loans – non-owner occupied 12,911 — 37 254 13,202 Multi-family mortgage - Illinois 279,021 — 216 — 279,237 Multi-family mortgage - Other 340,633 — — — 340,633 Nonresidential real estate 151,793 281 98 270 152,442 Land 172 — — — 172 Commercial loans: Regional commercial banking 34,764 4,810 — — 39,574 Health care 85,001 — 342 — 85,343 Direct commercial lessor 62,489 — — — 62,489 Commercial leases: Investment rated commercial leases 165,508 701 — — 166,209 Other commercial leases 133,185 — — — 133,185 Consumer 1,529 3 7 — 1,539 $ 1,322,359 $ 6,290 $ 1,028 $ 1,517 $ 1,331,194

Other Real Estate Owned (Notes)

Other Real Estate Owned (Notes)	3 Months Ended
	Mar. 31, 2019
Other Real Estate [Abstract]
Real Estate Owned [Text Block]	R 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. March 31, 2019 December 31, 2018 Balance Valuation Allowance Net OREO Balance Balance Valuation Allowance Net OREO Balance One–to–four family residential $ 921 $ — $ 921 $ 875 $ — $ 875 Multi-family mortgage — — — 276 — 276 Nonresidential real estate — — — 74 — 74 Land — — — 24 (23 ) 1 $ 921 $ — $ 921 $ 1,249 $ (23 ) $ 1,226 The following represents the roll forward of OREO and the composition of OREO properties: For the Three Months Ended March 31, 2019 2018 Beginning balance $ 1,226 $ 2,351 New foreclosed properties 46 562 Valuation adjustments — (25 ) Sales and payments (351 ) (1,086 ) Ending balance $ 921 $ 1,802 Activity in the valuation allowance is as follows: For the Three Months Ended March 31, 2019 2018 Beginning balance $ 23 $ 305 Additions charged to expense — 25 Reductions from sales of OREO (23 ) (9 ) Ending balance $ — $ 321 At March 31, 2019 and December 31, 2018 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 March 31, 2019 and December 31, 2018 , the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $636,000 and $349,000 , respectively.

LEASES (Notes)

LEASES (Notes)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
LEASES	Statement of Financial Condition Location March 31, 2019 Operating Lease Right of Use Asset: Gross carrying amount $ 6,694 Accumulated amortization (212 ) Net book value Other assets $ 6,482 Operating Lease Liabilities: Right of use lease obligations Other liabilities $ 6,482 For the three months ended March 31, 2019 , the weighted-average remaining lease term for operating was 9.50 years and the weighted-average discount rate used in the measurement of operating lease liabilities was 3.16% . The Company utilized the FHLB fixed rate advance rate as of January 1, 2019 for the term most closely aligning with the remaining lease term. Three Months Ended Lease cost: Operating lease cost $ 212 Short-term lease cost 31 Sublease income (6 ) Total lease cost $ 237 Other information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 223 Future minimum payments under non-cancellable operating leases with terms longer than 12 months, are as follows at March 31, 2019 : Twelve months ended March 31, 2020 $ 892 2021 910 2022 930 2023 977 2024 827 Thereafter 3,099 Total future minimum operating lease payments 7,635 Amounts representing interest (1,153 ) Present value of net future minimum operating lease payments $ 6,482

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase (Notes)	3 Months Ended
	Mar. 31, 2019
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold Under Agreements to Repurchase	Securities sold under agreements to repurchase, included with borrowings on the consolidated balance sheet, are shown below. Overnight and Continuous Up to 30 days 30 - 90 days Greater Than 90 days Total March 31, 2019 Repurchase agreements and repurchase-to-maturity transactions $ 1,106 $ — $ — $ — $ 1,106 Gross amount of recognized liabilities for repurchase agreements in Statements of Financial Condition $ 1,106 December 31, 2018 Repurchase agreements and repurchase-to-maturity transactions $ 1,049 $ — $ — $ — $ 1,049 Gross amount of recognized liabilities for repurchase agreements in Statements of Financial Condition $ 1,049 Securities sold under agreements to repurchase were secured by mortgage-backed securities with a carrying amount of $2.6 million and $2.7 million at March 31, 2019 and December 31, 2018 , respectively. Because security values fluctuate due to market conditions, the Company has no control over the market value of securities sold under agreements to repurchase. The Company is contractually obligated to promptly transfer additional securities to the counterparty if the market value of the securities falls below the repurchase price. Also included in total borrowings were fixed-rate advances, due within a year, from the FHLB of $15.0 million at March 31, 2019 and $20.0 million at December 31, 2018 .

Fair Value (Notes)

Fair Value (Notes)	3 Months Ended
	Mar. 31, 2019
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 available-for-sale : 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). Other investments : Other investments includes our investments in equity securities without readily determinable fair values. Equity investments without readily determinable fair values, includes our Visa Class B shares, which are categorized as Level 3. Our Visa Class B ownership includes shares acquired at no cost from our prior participation in Visa’s network while Visa operated as a cooperative. 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 March 31, 2019 Securities available-for-sale: Certificates of deposit $ — $ 69,011 $ — $ 69,011 Municipal securities — 511 — 511 Mortgage-backed securities – residential — 10,207 — 10,207 Collateralized mortgage obligations – residential — 3,511 — 3,511 $ — $ 83,240 $ — $ 83,240 December 31, 2018 Securities available-for-sale: Certificates of deposit $ — $ 73,507 $ — $ 73,507 Municipal securities — 509 — 509 Mortgage-backed securities - residential — 10,478 — 10,478 Collateralized mortgage obligations – residential — 3,685 — 3,685 $ — $ 88,179 $ — $ 88,179 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 December 31, 2018 Impaired loans - nonresidential real estate $ — $ — $ 243 $ 243 Other real estate owned - land $ — $ — $ 1 $ 1 Other investments (1) $ — $ — $ 3,427 $ 3,427 (1) See Note 1 for additional disclosures resulting from Company's adoption of ASU 2016-01. At March 31, 2019 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, resulting in a decrease in the provision for loan losses of $27,000 for the quarter ended March 31, 2019 . At December 31, 2018 there was one nonresidential impaired loan with a carrying value of $270,000 and a valuation allowance of $27,000 that was measured for impairment using the fair value of the collateral for collateral–dependent loans and which had a specific valuation allowance. OREO is carried at the lower of cost or fair value less costs to sell, had a carrying value of $24,000 less a valuation allowance of $23,000 , or $1,000 at December 31, 2018 . There were no valuation adjustments of OREO recorded for the three months ended March 31, 2019 , compared to $25,000 of valuation adjustments of OREO recorded for the three months ended March 31, 2018 . 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, 2018 : Fair Value Valuation Significant Unobservable Range Other real estate owned - land $ 1 Sales comparison Discount applied to valuation 12.3% The carrying amount and estimated fair value of financial instruments are as follows: Fair Value Measurements at March 31, 2019 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 78,222 $ 12,016 $ 66,206 $ — $ 78,222 Securities 83,240 — 83,240 — 83,240 Loans receivable, net of allowance for loan losses 1,306,475 — — 1,305,976 1,305,976 FHLB and FRB stock 8,026 — — — N/A Accrued interest receivable 5,411 — 319 5,092 5,411 Financial liabilities Noninterest-bearing demand deposits $ 222,328 $ — $ 222,328 $ — $ 222,328 NOW and money market accounts 515,059 — 515,059 — 515,059 Savings deposits 155,505 — 155,505 — 155,505 Certificates of deposit 433,854 — 433,096 — 433,096 Borrowings 16,106 — 16,105 — 16,105 Accrued interest payable 146 — 146 — 146 Fair Value Measurements at December 31, 2018 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 98,204 $ 13,805 $ 84,399 $ — $ 98,204 Securities 88,179 — 88,179 — 88,179 Loans receivable, net of allowance for loan losses 1,323,793 — — 1,315,855 1,315,855 FHLB and FRB stock 8,026 — — — N/A Accrued interest receivable 4,952 — 249 4,703 4,952 Financial liabilities Noninterest-bearing demand deposits $ 230,041 $ — $ 230,041 $ — $ 230,041 NOW and money market accounts 531,781 — 531,781 — 531,781 Savings deposits 152,334 — 152,334 — 152,334 Certificates of deposit 438,328 — 436,598 — 436,598 Borrowings 21,049 — 21,050 — 21,050 Accrued interest payable 291 — 291 — 291 Loans : The exit price observations are obtained from an independent third-party using its proprietary valuation model and methodology and may not reflect actual or prospective market valuations. The valuation is based on the probability of default, loss given default, recovery delay, prepayment, and discount rate assumptions. The new methodology is a result of the adoption of ASU 2016-01 in 2018. 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.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	All of the Company's revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. The following table presents the Company's sources of noninterest income. Items outside of the scope of the ASC 606 are noted as such. Three Months Ended 2019 2018 Deposit service charges and fees $ 930 $ 978 Loan servicing fees (1) 23 70 Mortgage brokerage and banking fees (1) 28 71 Gain on sales of equity securities (1) 295 — Loss on disposal of other assets (19 ) — Trust and insurance commissions and annuities income 205 213 Earnings on bank-owned life insurance (1) 30 66 Other (1) 132 141 Total noninterest income $ 1,624 $ 1,539 (1) Not within the scope of ASC 606 A description of the Company's revenue streams accounted for under ASC 606 follows: Deposit service charges and fees: The Company earns fees from its deposit customers based on specific types of transactions, account maintenance and overdraft services. Transaction-based fees, which include services such as ATM use fees, stop payment charges, statement rendering, and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Company fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which the Company satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer's account balance. Interchange income: The Company earns interchange fees from debit cardholder transactions conducted through the Visa payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder. Interchange income was $361,000 for the three months ended March 31, 2019 and 2018 . Interchange income is included in deposit service charges and fees. Trust and insurance commissions and annuities income: The Company earns trust, insurance commissions and annuities income from its contracts with trust customers to manage assets for investment, and/or to transact on their accounts. These fees are primarily earned over time as the Company provides the contracted monthly or quarterly services and are generally assessed based on a tiered scale of the market value of assets under management (AUM) at month-end. Fees that are transaction based, including trade execution services, are recognized at the point in time that the transaction is executed, i.e ., the trade date. Other related services provided include fees the Company earns, which are based on a fixed fee schedule, are recognized when the services are rendered. Gains/losses on sales of OREO: The Company records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Company finances the sale of OREO to the buyer, the Company assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Company adjusts the transaction price and related gain (loss) on sale if a significant financing component is present. OREO sales for the three months ended March 31, 2019 and 2018 were not financed by the Bank.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
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, is the owner of all of the issued and outstanding capital stock of BankFinancial, NA (the “Bank”). The interim unaudited consolidated financial statements include the accounts and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BFIN Asset Recovery Company, LLC (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. Such adjustments are the only adjustments reflected in the accompanying financial statements. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three month period ended March 31, 2019 is not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2019 or for any other period. 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. Lease Accounting: The Company adopted FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), including the adoption of the practical expedients, on January 1, 2019. Lessees are required to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. The Company recorded assets and liabilities of $6.7 million as a result of recording additional lease contracts where the Company is lessee. The Company did not restate comparative periods. The right of use asset is included in other assets and the lease obligations is included in other liabilities in the accompanying consolidated statements of financial condition. Other Intangible Assets : Intangible assets acquired in a purchase business combination with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible assets (“CDI”), are recognized at the time of acquisition based on valuations prepared by independent third parties or other estimates of fair value. In preparing such valuations, variables such as deposit servicing costs, attrition rates, and market discount rates are considered. CDI assets are amortized to expense over their useful lives. CDI were $82,000 and $102,000 at March 31, 2019 and December 31, 2018 , respectively, and are included in other assets in the accompanying consolidated statements of financial condition. 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, 2018 , as filed with the Securities and Exchange Commission. Newly Issued Not Yet Effective Accounting Standards 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; however, we do not anticipate early application of the standard. In 2018, we contracted with a third-party vendor for CECL-compliant software. As of March 31, 2019, we concluded initial testing and determined that we have sufficient loan data to support the requirements of the pronouncement. We are now evaluating CECL-compliant loss methodologies to determine the correlation to historical loan performance by portfolio segment. We are presently unable to determine the impact of ASU 2016-13 to our financial statements. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“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. We early adopted the pronouncement and adoption of the new pronouncement was immaterial to the consolidated financial statements.
Basis of Presentation	Basis of Presentation : BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois, is the owner of all of the issued and outstanding capital stock of BankFinancial, NA (the “Bank”).
Principles of Consolidation	The interim unaudited consolidated financial statements include the accounts and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BFIN Asset Recovery Company, LLC (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. Such adjustments are the only adjustments reflected in the accompanying financial statements. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three month period ended March 31, 2019 is not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2019 or for any other period. 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 $40,000 and $38,000 at March 31, 2019 and December 31, 2018 , 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, 2018 , as filed with the Securities and Exchange Commission.
Recent Accounting Pronouncements	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; however, we do not anticipate early application of the standard. In 2018, we contracted with a third-party vendor for CECL-compliant software. As of March 31, 2019, we concluded initial testing and determined that we have sufficient loan data to support the requirements of the pronouncement. We are now evaluating CECL-compliant loss methodologies to determine the correlation to historical loan performance by portfolio segment. We are presently unable to determine the impact of ASU 2016-13 to our financial statements. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“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. We early adopted the pronouncement and adoption of the new pronouncement was immaterial to the consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies New Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2019
Text Block [Abstract]
Recent Accounting Pronouncements	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; however, we do not anticipate early application of the standard. In 2018, we contracted with a third-party vendor for CECL-compliant software. As of March 31, 2019, we concluded initial testing and determined that we have sufficient loan data to support the requirements of the pronouncement. We are now evaluating CECL-compliant loss methodologies to determine the correlation to historical loan performance by portfolio segment. We are presently unable to determine the impact of ASU 2016-13 to our financial statements. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“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. We early adopted the pronouncement and adoption of the new pronouncement was immaterial to the consolidated financial statements.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended 2019 2018 Net income available to common stockholders $ 3,551 $ 3,559 Average common shares outstanding 16,202,303 17,931,579 Less - Unvested restricted stock shares — (940 ) Weighted average common shares outstanding 16,202,303 17,930,639 Add - Net effect of dilutive unvested restricted stock — 461 Diluted weighted average common shares outstanding 16,202,303 17,931,100 Basic earnings per common share $ 0.22 $ 0.20 Diluted earnings per common share $ 0.22 $ 0.20

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	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 Available-for-Sale Securities March 31, 2019 Certificates of deposit $ 69,011 $ — $ — $ 69,011 Municipal securities 508 3 — 511 Mortgage-backed securities - residential 9,828 401 (22 ) 10,207 Collateralized mortgage obligations - residential 3,516 5 (10 ) 3,511 $ 82,863 $ 409 $ (32 ) $ 83,240 December 31, 2018 Certificates of deposit $ 73,507 $ — $ — $ 73,507 Municipal securities 509 — — 509 Mortgage-backed securities - residential 10,116 400 (38 ) 10,478 Collateralized mortgage obligations - residential 3,676 11 (2 ) 3,685 $ 87,808 $ 411 $ (40 ) $ 88,179 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. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Equity Investments (1) December 31, 2018 Visa Class B shares $ — $ 3,427 $ — $ 3,427 (1) Equity investments are included in Other Assets in the Consolidated Statements of Financial Condition. 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. March 31, 2019 Amortized Cost Fair Value Due in one year or less $ 69,011 $ 69,011 Due after one year through five years 508 511 69,519 69,522 Mortgage-backed securities - residential 9,828 10,207 Collateralized mortgage obligations - residential 3,516 3,511 $ 82,863 $ 83,240 Investment securities available-for-sale with carrying values of $2.6 million and $2.7 million at March 31, 2019 and December 31, 2018 , respectively, were pledged as collateral on customer repurchase agreements and for other purposes as required or permitted by law. Sales of equity securities were as follows: Three Months Ended 2019 2018 Proceeds $ 3,722 $ — Gross gains 295 — Gross 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 March 31, 2019 Mortgage-backed securities - residential $ — $ — $ 910 $ (22 ) $ 910 $ (22 ) Collateralized mortgage obligations - residential 1,644 (4 ) 1,275 (6 ) 2,919 (10 ) $ 1,644 $ (4 ) $ 2,185 $ (28 ) $ 3,829 $ (32 ) December 31, 2018 Mortgage-backed securities - residential $ — $ — $ 904 $ (38 ) $ 904 $ (38 ) Collateralized mortgage obligations - residential — — 1,729 (2 ) 1,729 (2 ) $ — $ — $ 2,633 $ (40 ) $ 2,633 $ (40 ) 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 March 31, 2019 , 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. The Bank, as a member of Visa USA, received 51,404 unrestricted shares of Visa, Inc. Class B common stock in connection with Visa, Inc.’s initial public offering in 2007. The retroactive responsibility plan obligates all former Visa USA members to indemnify Visa USA, in proportion to their equity interests in Visa USA, for certain litigation losses and expenses, including settlement expenses, for the lawsuits covered by the retrospective responsibility plan. Due to the restrictions that the retrospective responsibility plan imposes on the Company’s Visa, Inc. Class B shares, the Company had not recorded the Class B shares as an asset. The Bank sold 25,702 shares of Visa Class B common stock in the fourth quarter of 2018 and recorded a gain of $3.6 million . For equity investments without readily determinable fair values, when an orderly transaction for the identical or similar investment of the same issuer is identified, we use the valuation techniques permitted under ASC 820 Fair Value to evaluate the observed transaction(s) and adjust the fair value of the equity investment. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the 25,702 Visa Class B shares that the Company owned as of December 31, 2018 were recorded at $3.4 million in other assets with a corresponding gain. The Bank sold the remaining 25,702 shares of Visa Class B common stock in the first quarter of 2019 and recorded a gain of $295,000 .
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 Available-for-Sale Securities March 31, 2019 Certificates of deposit $ 69,011 $ — $ — $ 69,011 Municipal securities 508 3 — 511 Mortgage-backed securities - residential 9,828 401 (22 ) 10,207 Collateralized mortgage obligations - residential 3,516 5 (10 ) 3,511 $ 82,863 $ 409 $ (32 ) $ 83,240 December 31, 2018 Certificates of deposit $ 73,507 $ — $ — $ 73,507 Municipal securities 509 — — 509 Mortgage-backed securities - residential 10,116 400 (38 ) 10,478 Collateralized mortgage obligations - residential 3,676 11 (2 ) 3,685 $ 87,808 $ 411 $ (40 ) $ 88,179 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. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Equity Investments (1) December 31, 2018 Visa Class B shares $ — $ 3,427 $ — $ 3,427 (1) Equity investments are included in Other Assets in the Consolidated Statements of Financial Condition.
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. March 31, 2019 Amortized Cost Fair Value Due in one year or less $ 69,011 $ 69,011 Due after one year through five years 508 511 69,519 69,522 Mortgage-backed securities - residential 9,828 10,207 Collateralized mortgage obligations - residential 3,516 3,511 $ 82,863 $ 83,240
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 March 31, 2019 Mortgage-backed securities - residential $ — $ — $ 910 $ (22 ) $ 910 $ (22 ) Collateralized mortgage obligations - residential 1,644 (4 ) 1,275 (6 ) 2,919 (10 ) $ 1,644 $ (4 ) $ 2,185 $ (28 ) $ 3,829 $ (32 ) December 31, 2018 Mortgage-backed securities - residential $ — $ — $ 904 $ (38 ) $ 904 $ (38 ) Collateralized mortgage obligations - residential — — 1,729 (2 ) 1,729 (2 ) $ — $ — $ 2,633 $ (40 ) $ 2,633 $ (40 )

Loans Receivable (Tables)

Loans Receivable (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans receivable	Loans receivable are as follows: March 31, 2019 December 31, 2018 One-to-four family residential real estate $ 66,833 $ 70,371 Multi-family mortgage 634,328 619,870 Nonresidential real estate 148,601 152,442 Construction and land 145 172 Commercial loans 172,264 187,406 Commercial leases 289,750 299,394 Consumer 1,846 1,539 1,313,767 1,331,194 Net deferred loan origination costs 1,062 1,069 Allowance for loan losses (8,354 ) (8,470 ) Loans, net $ 1,306,475 $ 1,323,793
Loans Receivable Based On Impairment Method	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 March 31, 2019 One-to-four family residential real estate $ — $ 649 $ 649 $ 2,365 $ 64,468 $ 66,833 Multi-family mortgage — 4,079 4,079 646 633,682 634,328 Nonresidential real estate — 1,487 1,487 242 148,359 148,601 Construction and land — 3 3 — 145 145 Commercial loans — 1,422 1,422 354 171,910 172,264 Commercial leases — 690 690 — 289,750 289,750 Consumer — 24 24 — 1,846 1,846 $ — $ 8,354 $ 8,354 $ 3,607 $ 1,310,160 1,313,767 Net deferred loan origination costs 1,062 Allowance for loan losses (8,354 ) Loans, net $ 1,306,475 The following tables present loans individually evaluated for impairment by class of loans: Three months ended Loan Balance Recorded Investment Partial Charge-off Allowance for Loan Losses Allocated Average Investment in Impaired Loans Interest Income Recognized March 31, 2019 With no related allowance recorded: One-to-four family residential real estate $ 2,896 $ 2,303 $ 561 $ — $ 2,230 $ 15 One-to-four family residential real estate - non-owner occupied 86 32 56 — 43 — Multi-family mortgage - Illinois 645 649 — — 651 9 Nonresidential real estate 356 242 121 — 61 — Commercial loans - health care 354 354 — — 89 6 $ 4,337 $ 3,580 $ 738 $ — $ 3,074 $ 30 Year ended December 31, 2018 Loan Balance Recorded Investment Partial Charge-off Allowance for Loan Losses Allocated Average Investment in Impaired Loans Interest Income Recognized December 31, 2018 With no related allowance recorded: One-to-four family residential real estate $ 2,751 $ 2,155 $ 575 $ — $ 3,274 $ 41 One-to-four family residential real estate - non-owner occupied 86 46 43 — 95 — Multi-family mortgage - Illinois 654 653 — — 795 39 3,491 2,854 $ 618 — 4,164 80 With an allowance recorded - Nonresidential real estate 356 270 93 27 21 — $ 3,847 $ 3,124 $ 711 $ 27 $ 4,185 $ 80
Allowance for loan losses	ctivity in the allowance for loan losses is as follows: Three Months Ended 2019 2018 Beginning balance $ 8,470 $ 8,366 Loans charged off: One-to-four family residential real estate (23 ) (97 ) Nonresidential real estate (28 ) — Consumer (5 ) — (56 ) (97 ) Recoveries: One-to-four family residential real estate 17 99 Multi-family mortgage 8 8 Commercial loans 2 223 27 330 Net (charge-offs) recoveries (29 ) 233 Recovery of loan losses (87 ) (258 ) Ending balance $ 8,354 $ 8,341
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 March 31, 2019 One-to-four family residential real estate $ 1,089 $ 812 $ — One-to-four family residential real estate – non-owner occupied 86 32 — Nonresidential real estate 356 242 — Commercial loans – health care 354 354 — $ 1,885 $ 1,440 $ — December 31, 2018 One-to-four family residential real estate $ 2,167 $ 1,162 $ — One-to-four family residential real estate – non-owner occupied 270 78 — Nonresidential real estate 356 270 — $ 2,793 $ 1,510 $ —
Past Due Financing Receivables	The following tables present the aging of the recorded investment of loans at March 31, 2019 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 $ 559 $ 35 $ 804 $ 1,398 $ 52,595 $ 53,993 One-to-four family residential real estate loans – non-owner occupied 141 147 33 321 12,141 12,462 Multi-family mortgage - Illinois — — — — 273,114 273,114 Multi-family mortgage - Other — — — — 357,588 357,588 Nonresidential real estate 283 — 242 525 146,566 147,091 Land — — — — 142 142 Commercial loans: Regional commercial banking — — — — 37,719 37,719 Health care — — — — 85,048 85,048 Direct commercial lessor — — — — 49,975 49,975 Commercial leases: Investment rated commercial leases 336 — — 336 158,095 158,431 Other commercial leases 37 — — 37 133,324 133,361 Consumer 6 6 — 12 1,847 1,859 $ 1,362 $ 188 $ 1,079 $ 2,629 $ 1,308,154 $ 1,310,783 The following tables present the aging of the recorded investment of loans at December 31, 2018 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 $ 1,380 $ 637 $ 1,162 $ 3,179 $ 53,820 $ 56,999 One-to-four family residential real estate loans – non-owner occupied 387 10 78 475 12,460 12,935 Multi-family mortgage - Illinois 458 — — 458 275,283 275,741 Multi-family mortgage - Other — — — — 340,470 340,470 Nonresidential real estate — 270 — 270 149,271 149,541 Land — — — — 169 169 Commercial loans: Regional commercial banking — — — — 39,712 39,712 Health care — — — — 85,418 85,418 Direct commercial lessor — — — — 62,719 62,719 Commercial leases: Investment rated commercial leases 505 — — 505 166,713 167,218 Other commercial leases — — — — 133,958 133,958 Consumer 40 4 — 44 1,508 1,552 $ 2,770 $ 921 $ 1,240 $ 4,931 $ 1,321,501 $ 1,326,432
Troubled Debt Restructurings on Financing Receivables	The following table presents loans classified as TDRs: March 31, 2019 December 31, 2018 One-to-four family residential real estate - nonaccrual $ 17 $ 17
Financing Receivable Credit Quality Indicators	As of March 31, 2019 , 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 $ 52,783 $ 359 $ 347 $ 813 $ 54,302 One-to-four family residential real estate loans – non-owner occupied 12,293 168 37 33 12,531 Multi-family mortgage - Illinois 274,368 — 214 — 274,582 Multi-family mortgage - Other 359,746 — — — 359,746 Nonresidential real estate 147,984 280 95 242 148,601 Land 145 — — — 145 Commercial loans: Regional commercial banking 32,335 5,304 — — 37,639 Health care 81,527 — 3,033 354 84,914 Direct commercial lessor 49,711 — — — 49,711 Commercial leases: Investment rated commercial leases 156,569 646 — — 157,215 Other commercial leases 132,535 — — — 132,535 Consumer 1,828 9 9 — 1,846 $ 1,301,824 $ 6,766 $ 3,735 $ 1,442 $ 1,313,767 As of December 31, 2018 , 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 $ 55,353 $ 495 $ 328 $ 993 $ 57,169 One-to-four family residential real estate loans – non-owner occupied 12,911 — 37 254 13,202 Multi-family mortgage - Illinois 279,021 — 216 — 279,237 Multi-family mortgage - Other 340,633 — — — 340,633 Nonresidential real estate 151,793 281 98 270 152,442 Land 172 — — — 172 Commercial loans: Regional commercial banking 34,764 4,810 — — 39,574 Health care 85,001 — 342 — 85,343 Direct commercial lessor 62,489 — — — 62,489 Commercial leases: Investment rated commercial leases 165,508 701 — — 166,209 Other commercial leases 133,185 — — — 133,185 Consumer 1,529 3 7 — 1,539 $ 1,322,359 $ 6,290 $ 1,028 $ 1,517 $ 1,331,194

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2019
Other Real Estate [Abstract]
Schedule of Real Estate Properties [Table Text Block]	March 31, 2019 December 31, 2018 Balance Valuation Allowance Net OREO Balance Balance Valuation Allowance Net OREO Balance One–to–four family residential $ 921 $ — $ 921 $ 875 $ — $ 875 Multi-family mortgage — — — 276 — 276 Nonresidential real estate — — — 74 — 74 Land — — — 24 (23 ) 1 $ 921 $ — $ 921 $ 1,249 $ (23 ) $ 1,226
Real Estate Owned, rollforward [Table Text Block]	The following represents the roll forward of OREO and the composition of OREO properties: For the Three Months Ended March 31, 2019 2018 Beginning balance $ 1,226 $ 2,351 New foreclosed properties 46 562 Valuation adjustments — (25 ) Sales and payments (351 ) (1,086 ) Ending balance $ 921 $ 1,802
OREO valuation allowance, rollforward [Table Text Block]	Activity in the valuation allowance is as follows: For the Three Months Ended March 31, 2019 2018 Beginning balance $ 23 $ 305 Additions charged to expense — 25 Reductions from sales of OREO (23 ) (9 ) Ending balance $ — $ 321

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	The following table represents the classification of the Company's right of use and lease liabilities: Statement of Financial Condition Location March 31, 2019 Operating Lease Right of Use Asset: Gross carrying amount $ 6,694 Accumulated amortization (212 ) Net book value Other assets $ 6,482 Operating Lease Liabilities: Right of use lease obligations Other liabilities $ 6,482 For the three months ended March 31, 2019 , the weighted-average remaining lease term for operating was 9.50 years and the weighted-average discount rate used in the measurement of operating lease liabilities was 3.16% . The Company utilized the FHLB fixed rate advance rate as of January 1, 2019 for the term most closely aligning with the remaining lease term. Three Months Ended Lease cost: Operating lease cost $ 212 Short-term lease cost 31 Sublease income (6 ) Total lease cost $ 237 Other information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 223
Operating Lease, Liability	Future minimum payments under non-cancellable operating leases with terms longer than 12 months, are as follows at March 31, 2019 : Twelve months ended March 31, 2020 $ 892 2021 910 2022 930 2023 977 2024 827 Thereafter 3,099 Total future minimum operating lease payments 7,635 Amounts representing interest (1,153 ) Present value of net future minimum operating lease payments $ 6,482

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	3 Months Ended
	Mar. 31, 2019
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	Securities sold under agreements to repurchase, included with borrowings on the consolidated balance sheet, are shown below. Overnight and Continuous Up to 30 days 30 - 90 days Greater Than 90 days Total March 31, 2019 Repurchase agreements and repurchase-to-maturity transactions $ 1,106 $ — $ — $ — $ 1,106 Gross amount of recognized liabilities for repurchase agreements in Statements of Financial Condition $ 1,106 December 31, 2018 Repurchase agreements and repurchase-to-maturity transactions $ 1,049 $ — $ — $ — $ 1,049 Gross amount of recognized liabilities for repurchase agreements in Statements of Financial Condition $ 1,049

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 Securities available-for-sale: Certificates of deposit $ — $ 69,011 $ — $ 69,011 Municipal securities — 511 — 511 Mortgage-backed securities – residential — 10,207 — 10,207 Collateralized mortgage obligations – residential — 3,511 — 3,511 $ — $ 83,240 $ — $ 83,240 December 31, 2018 Securities available-for-sale: Certificates of deposit $ — $ 73,507 $ — $ 73,507 Municipal securities — 509 — 509 Mortgage-backed securities - residential — 10,478 — 10,478 Collateralized mortgage obligations – residential — 3,685 — 3,685 $ — $ 88,179 $ — $ 88,179
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 December 31, 2018 Impaired loans - nonresidential real estate $ — $ — $ 243 $ 243 Other real estate owned - land $ — $ — $ 1 $ 1 Other investments (1) $ — $ — $ 3,427 $ 3,427
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 December 31, 2018 : Fair Value Valuation Significant Unobservable Range Other real estate owned - land $ 1 Sales comparison Discount applied to valuation 12.3%
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 March 31, 2019 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 78,222 $ 12,016 $ 66,206 $ — $ 78,222 Securities 83,240 — 83,240 — 83,240 Loans receivable, net of allowance for loan losses 1,306,475 — — 1,305,976 1,305,976 FHLB and FRB stock 8,026 — — — N/A Accrued interest receivable 5,411 — 319 5,092 5,411 Financial liabilities Noninterest-bearing demand deposits $ 222,328 $ — $ 222,328 $ — $ 222,328 NOW and money market accounts 515,059 — 515,059 — 515,059 Savings deposits 155,505 — 155,505 — 155,505 Certificates of deposit 433,854 — 433,096 — 433,096 Borrowings 16,106 — 16,105 — 16,105 Accrued interest payable 146 — 146 — 146 Fair Value Measurements at December 31, 2018 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 98,204 $ 13,805 $ 84,399 $ — $ 98,204 Securities 88,179 — 88,179 — 88,179 Loans receivable, net of allowance for loan losses 1,323,793 — — 1,315,855 1,315,855 FHLB and FRB stock 8,026 — — — N/A Accrued interest receivable 4,952 — 249 4,703 4,952 Financial liabilities Noninterest-bearing demand deposits $ 230,041 $ — $ 230,041 $ — $ 230,041 NOW and money market accounts 531,781 — 531,781 — 531,781 Savings deposits 152,334 — 152,334 — 152,334 Certificates of deposit 438,328 — 436,598 — 436,598 Borrowings 21,049 — 21,050 — 21,050 Accrued interest payable 291 — 291 — 291

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Noninterest Income Outside the Scope of ASC 606	The following table presents the Company's sources of noninterest income. Items outside of the scope of the ASC 606 are noted as such. Three Months Ended 2019 2018 Deposit service charges and fees $ 930 $ 978 Loan servicing fees (1) 23 70 Mortgage brokerage and banking fees (1) 28 71 Gain on sales of equity securities (1) 295 — Loss on disposal of other assets (19 ) — Trust and insurance commissions and annuities income 205 213 Earnings on bank-owned life insurance (1) 30 66 Other (1) 132 141 Total noninterest income $ 1,624 $ 1,539 (1) Not within the scope of ASC 606

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	Mar. 31, 2019	Jan. 01, 2019	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Gross carrying amount	$ 6,694,000	$ 6,700,000		$ 0
Right of use lease obligations	$ 6,482,000	$ 6,700,000
Intangible Assets, Net (Excluding Goodwill)			$ 82,000		$ 102,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders	$ 3,551	$ 3,559
Average common shares outstanding (shares)	16,202,303	17,931,579
Less:
Unvested restricted stock shares (shares)	0	(940)
Weighted average common shares outstanding (shares)	16,202,303	17,930,639
Add - Net effect of dilutive stock options and unvested restricted stock	0	461
Weighted average diluted common shares outstanding (shares)	16,202,303	17,931,100
Basic earnings per common share (usd per share)	$ 0.22	$ 0.20
Diluted earnings per common share (usd per share)	$ 0.22	$ 0.20
Retained Earnings [Member]
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders	$ 3,551	$ 3,559

Securities - Fair Value of Secu

Securities - Fair Value of Securites (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	$ 82,863	$ 87,808
Gross Unrealized Gains	409	411
Gross Unrealized Losses	(32)	(40)
Total Fair value	83,240	88,179
Certificates of deposit [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	69,011	73,507
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair value	69,011	73,507
Municipal Bonds [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Available-for-sale Securities, Amortized Cost Basis	508	509
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Total Fair value	511	509
Equity mutual fund [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Total Fair value	0	0
Mortgage - backed securities - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	9,828	10,116
Gross Unrealized Gains	401	400
Gross Unrealized Losses	(22)	(38)
Total Fair value	10,207	10,478
Collateralized mortgage obligations - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	3,516	3,676
Gross Unrealized Gains	5	11
Gross Unrealized Losses	(10)	(2)
Total Fair value	$ 3,511	$ 3,685

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost and fair values of securities
Total Fair value	$ 83,240	$ 88,179
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	69,519
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	69,522
Amortized Cost	82,863	87,808
Gross Unrealized Gains	409	411
Gross Unrealized Losses	(32)	(40)
Certificates of Deposit [Member]
Amortized cost and fair values of securities
Total Fair value	69,011	73,507
Amortized Cost	69,011	73,507
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Municipal Bonds [Member]
Amortized cost and fair values of securities
Total Fair value	511	509
Available-for-sale Securities, Amortized Cost Basis	508	509
Equity mutual fund [Member]
Amortized cost and fair values of securities
Total Fair value	0	0
Mortgage - backed securities - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	9,828
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	10,207
Total Fair value	10,207	10,478
Amortized Cost	9,828	10,116
Gross Unrealized Gains	401	400
Gross Unrealized Losses	(22)	(38)
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	3,516
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	3,511
Total Fair value	3,511	3,685
Amortized Cost	3,516	3,676
Gross Unrealized Gains	5	11
Gross Unrealized Losses	(10)	(2)
Common Class B [Member] | Equity mutual fund [Member]
Amortized cost and fair values of securities
Total Fair value		3,427
Amortized Cost		0
Gross Unrealized Gains		3,427
Gross Unrealized Losses		0
Fair Value, Measurements, Nonrecurring [Member]
Amortized cost and fair values of securities
Total Fair value	83,240	88,179
Fair Value, Measurements, Nonrecurring [Member] | Certificates of Deposit [Member]
Amortized cost and fair values of securities
Total Fair value	69,011	73,507
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Amortized cost and fair values of securities
Total Fair value	83,240	$ 88,179
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Certificates of Deposit [Member]
Amortized cost and fair values of securities
Total Fair value	$ 69,011

Securities - Proceeds and Gross

Securities - Proceeds and Gross Gains (Losses) From Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Proceeds and Gross Gains (Losses) from Sale of Securities [Abstract]
Proceeds	$ 3,722	$ 0
Gross gains	295	0	$ 3,600
Gross losses	$ 0	$ 0

Securities - Unrealized Losses

Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost and fair values of securities
Less than 12 Months	$ 1,644	$ 0
12 Months or More	2,185	2,633
Total	3,829	2,633
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	(4)	0
12 Months or More	(28)	(40)
Unrealized Loss	(32)	(40)
Mortgage Backed Securities Residential [Member]
Amortized cost and fair values of securities
Less than 12 Months	0	0
12 Months or More	910	904
Total	910	904
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	0
12 Months or More	(22)	(38)
Unrealized Loss	(22)	(38)
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Less than 12 Months	1,644	0
12 Months or More	1,275	1,729
Total	2,919	1,729
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	(4)	0
12 Months or More	(6)	(2)
Unrealized Loss	$ (10)	$ (2)

Securities - Narrative (Details

Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2007
Debt Securities, Available-for-sale [Line Items]
Gross gains	$ 295		$ 0	$ 3,600
Debt Securities, Available-for-sale, Realized Loss	0		$ 0
Collateral Pledged [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 2,600	$ 2,700		2,700
Other Investments [Member] | Fair Value, Measurements, Nonrecurring [Member]
Debt Securities, Available-for-sale [Line Items]
Investments, Fair Value Disclosure		3,427		3,427
Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Fair Value, Measurements, Nonrecurring [Member]
Debt Securities, Available-for-sale [Line Items]
Investments, Fair Value Disclosure		$ 3,427		$ 3,427
Common Class B [Member]
Debt Securities, Available-for-sale [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		(25,702)
Visa Inc's Initial Public Offering [Member] | Common Class B [Member]
Debt Securities, Available-for-sale [Line Items]
Sale of Stock, Number of Shares Issued in Transaction					(51,404)
Shares, Outstanding		(25,702)		(25,702)

Loans Receivable (Details)

Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans receivable
Total loans	$ 1,313,767	$ 1,331,194
Net deferred loan origination costs	1,062	1,069
Allowance for loan losses	(8,354)	(8,470)	$ (8,341)	$ (8,366)
Loans, net	1,306,475	1,323,793
One-to-four family residential real estate loans [Member]
Loans receivable
Total loans	66,833	70,371
Allowance for loan losses	(649)	(699)
Multi-family mortgage loans [Member]
Loans receivable
Total loans	634,328	619,870
Allowance for loan losses	(4,079)	(3,991)
Nonresidential real estate loans [Member]
Loans receivable
Total loans	148,601	152,442
Allowance for loan losses	(1,487)	(1,476)
Construction and land loans [Member]
Loans receivable
Total loans	145	172
Allowance for loan losses	(3)	(4)
Commercial loans [Member]
Loans receivable
Total loans	172,264	187,406
Allowance for loan losses	(1,422)	(1,517)
Commercial leases [Member]
Loans receivable
Total loans	289,750	299,394
Allowance for loan losses	(690)	(755)
Consumer loans [Member]
Loans receivable
Total loans	1,846	1,539
Allowance for loan losses	$ (24)	$ (28)

Loans Receivable - Loan Origina

Loans Receivable - Loan Origination and Risk Management (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 1,313,767	$ 1,331,194
Multi-family mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	634,328	619,870
Nonresidential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	148,601	152,442
Commercial leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 289,750	$ 299,394

Loans Receivable - Allowance fo

Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for loan losses and the loans receivable by portfolio segment
Net deferred loan origination costs	$ 1,062	$ 1,069
Loans, net	$ 1,306,475	$ 1,323,793

Loans Receivable - Activity in

Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 8,470	$ 8,366
Loans charged off	(56)	(97)
Recoveries	27	330
Net charge-off	29	(233)
Recovery of loan losses	(87)	(258)
Ending balance	8,354	8,341
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	699
Loans charged off	(23)	(97)
Recoveries	17	99
Ending balance	649
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,991
Recoveries	8	8
Ending balance	4,079
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,476
Loans charged off	(28)	0
Ending balance	1,487
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4
Ending balance	3
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,517
Recoveries	2	223
Ending balance	1,422
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	755
Ending balance	690
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	28
Loans charged off	(5)	$ 0
Ending balance	$ 24

Loans Receivable - Loans Indivi

Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 1,313,767,000	$ 1,331,194,000
Loans individually evaluated for impairment by class loans
Loan Balance		3,491,000
Recorded Investment		2,854,000
Partial Charge-off		618,000
Average Investment in Impaired Loans		4,164,000
Interest Income Recognized		80,000
Allowance for loan losses (With an allowance recorded)	0	27,000
Impaired Loan, Total	4,337,000	3,847,000
Recorded Investment, Total	3,580,000	3,124,000
Partial Charge-offs, Total	738,000	711,000
Average Investment in Impaired Loans, Total	3,074,000	4,185,000
Interest Income Recognized, Total	30,000	80,000
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,354,000	8,443,000
Net deferred loan origination costs	1,062,000	1,069,000
Loans and Leases Receivable, Allowance	8,354,000	8,470,000	$ 8,341,000	$ 8,366,000
Financing Receivable, Individually Evaluated for Impairment	3,607,000	3,141,000
Financing Receivable, Collectively Evaluated for Impairment	1,310,160,000	1,328,053,000
Loans, net	1,306,475,000	1,323,793,000
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	66,833,000	70,371,000
Loans individually evaluated for impairment by class loans
Loan Balance	2,896,000	2,751,000
Recorded Investment	2,303,000	2,155,000
Partial Charge-off	561,000	575,000
Average Investment in Impaired Loans	2,230,000	3,274,000
Interest Income Recognized	15,000	41,000
Allowance for loan losses (With an allowance recorded)	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	649,000	699,000
Loans and Leases Receivable, Allowance	649,000	699,000
Financing Receivable, Individually Evaluated for Impairment	2,365,000	2,218,000
Financing Receivable, Collectively Evaluated for Impairment	64,468,000	68,153,000
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	12,531,000	13,202,000
Loans individually evaluated for impairment by class loans
Loan Balance	86,000	86,000
Recorded Investment	32,000	46,000
Partial Charge-off	56,000	43,000
Average Investment in Impaired Loans	43,000	95,000
Interest Income Recognized	0	0
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	634,328,000	619,870,000
Loans individually evaluated for impairment by class loans
Loan Balance	645,000	654,000
Recorded Investment	649,000	653,000
Partial Charge-off	0	0
Average Investment in Impaired Loans	651,000	795,000
Interest Income Recognized	9,000	39,000
Allowance for loan losses (With an allowance recorded)	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,079,000	3,991,000
Loans and Leases Receivable, Allowance	4,079,000	3,991,000
Financing Receivable, Individually Evaluated for Impairment	646,000	653,000
Financing Receivable, Collectively Evaluated for Impairment	633,682,000	619,217,000
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	274,582,000	279,237,000
Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	359,746,000	340,633,000
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	148,601,000	152,442,000
Loans individually evaluated for impairment by class loans
Loan Balance	356,000
Recorded Investment	242,000
Partial Charge-off	121,000
Average Investment in Impaired Loans	61,000
Interest Income Recognized	0
Allowance for loan losses (With an allowance recorded)	0	27,000
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,487,000	1,449,000
Loans and Leases Receivable, Allowance	1,487,000	1,476,000
Financing Receivable, Individually Evaluated for Impairment	242,000	270,000
Financing Receivable, Collectively Evaluated for Impairment	148,359,000	152,172,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		356,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment		270,000
Impaired Financing Receivable, with Related Allowance, Partial Charge-offs		93,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		21,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0
Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	145,000	172,000
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	37,639,000	39,574,000
Loans individually evaluated for impairment by class loans
Loan Balance	354,000
Recorded Investment	354,000
Partial Charge-off	0
Average Investment in Impaired Loans	89,000
Interest Income Recognized	6,000
Commercial loans - other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	132,535,000	133,185,000
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,846,000	1,539,000
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	24,000	28,000
Loans and Leases Receivable, Allowance	24,000	28,000
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	1,846,000	1,539,000
Construction And Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	145,000	172,000
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	3,000	4,000
Loans and Leases Receivable, Allowance	3,000	4,000
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	145,000	172,000
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	172,264,000	187,406,000
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	1,422,000	1,517,000
Loans and Leases Receivable, Allowance	1,422,000	1,517,000
Financing Receivable, Individually Evaluated for Impairment	354,000	0
Financing Receivable, Collectively Evaluated for Impairment	171,910,000	187,406,000
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	289,750,000	299,394,000
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	690,000	755,000
Loans and Leases Receivable, Allowance	690,000	755,000
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	289,750,000	299,394,000
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 54,302,000	$ 57,169,000

Loans Receivable - Nonaccrual L

Loans Receivable - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Reserve For Uncollected Loan Interest	$ 40	$ 38
Unpaid Principal Balance	1,885	2,793
Recorded Investment	1,440	1,510
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	1,089	2,167
Recorded Investment	812	1,162
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	86	270
Recorded Investment	32	78
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		356
Loans Past Due Over 90 Days, still accruing		0
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	356
Recorded Investment	242	$ 270
Loans Past Due Over 90 Days, still accruing	0
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	354
Recorded Investment	354
Loans Past Due Over 90 Days, still accruing	$ 0

Loans Receivable - Past Due Loa

Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 2,629	$ 4,931
Recorded Investment, Loans Not Past Due	1,308,154	1,321,501
Recorded investment, total	1,310,783	1,326,432
Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	336	505
Recorded Investment, Loans Not Past Due	158,095	166,713
Recorded investment, total	158,431	167,218
Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	37	0
Recorded Investment, Loans Not Past Due	133,324	133,958
Recorded investment, total	133,361	133,958
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	12	44
Recorded Investment, Loans Not Past Due	1,847	1,508
Recorded investment, total	1,859	1,552
Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Loans Not Past Due	85,048	85,418
Recorded investment, total	85,048	85,418
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	49,975	62,719
Recorded investment, total	49,975	62,719
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	37,719	39,712
Recorded investment, total	37,719	39,712
Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	142	169
Recorded investment, total	142	169
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	525	270
Recorded Investment, Loans Not Past Due	146,566	149,271
Recorded investment, total	147,091	149,541
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	357,588	340,470
Recorded investment, total	357,588	340,470
Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	458
Recorded Investment, Loans Not Past Due	273,114	275,283
Recorded investment, total	273,114	275,741
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	321	475
Recorded Investment, Loans Not Past Due	12,141	12,460
Recorded investment, total	12,462	12,935
One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1,398	3,179
Recorded Investment, Loans Not Past Due	52,595	53,820
Recorded investment, total	53,993	56,999
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1,362	2,770
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	336	505
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	37	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	6	40
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] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	283	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	458
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	141	387
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	559	1,380
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	188	921
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	6	4
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] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	270
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	0
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	147	10
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	35	637
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	1,079	1,240
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	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] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	242	0
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	0	0
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	33	78
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	$ 804	$ 1,162

Loans Receivable - Troubled Deb

Loans Receivable - Troubled Debt Restructuring (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
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
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	0		$ 0
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		$ 17,000

Loans Receivable - Credit Quali

Loans Receivable - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 2,629	$ 4,931
Financing Receivable Credit Quality Indicators
Total loans	1,313,767	1,331,194
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,398	3,179
Financing Receivable Credit Quality Indicators
Total loans	66,833	70,371
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	54,302	57,169
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	321	475
Financing Receivable Credit Quality Indicators
Total loans	12,531	13,202
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	458
Financing Receivable Credit Quality Indicators
Total loans	634,328	619,870
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	274,582	279,237
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	359,746	340,633
Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	148,601	152,442
Land loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	145	172
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	37,639	39,574
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	49,711	62,489
Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans
Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	84,914	85,343
Commercial loans - other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	37	0
Financing Receivable Credit Quality Indicators
Total loans	132,535	133,185
Commercial Leases - Investment Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	336	505
Financing Receivable Credit Quality Indicators
Total loans	157,215	166,209
Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,846	1,539
Nonaccrual [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,442	1,517
Nonaccrual [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	813	993
Nonaccrual [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	33	254
Nonaccrual [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
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	242	270
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	354	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
Nonaccrual [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member]
Financing Receivable Credit Quality Indicators
Total loans	3,735	1,028
Substandard [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	347	328
Substandard [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	37	37
Substandard [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	214	216
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	95	98
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	0	0
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	3,033	342
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	9	7
Pass [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,301,824	1,322,359
Pass [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	52,783	55,353
Pass [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	12,293	12,911
Pass [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	274,368	279,021
Pass [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	359,746	340,633
Pass [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	147,984	151,793
Pass [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	145	172
Pass [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	32,335	34,764
Pass [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	49,711	62,489
Pass [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	81,527	85,001
Pass [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	132,535	133,185
Pass [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	156,569	165,508
Pass [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,828	1,529
Special Mention [Member]
Financing Receivable Credit Quality Indicators
Total loans	6,766	6,290
Special Mention [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	359	495
Special Mention [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	168	0
Special Mention [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
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	280	281
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	5,304	4,810
Special Mention [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
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	0
Special Mention [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	646	701
Special Mention [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	9	3
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,362	2,770
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	559	1,380
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	141	387
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	458
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] | 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	37	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	$ 336	$ 505

Loans Receivable - Narrative (D

Loans Receivable - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Receivables [Abstract]
Reserve For Uncollected Loan Interest	$ 40,000		$ 38,000
Financing receivable modifications	17,000
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings	$ 0	$ 0

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Mortgage Loans in Process of Foreclosure, Amount	$ 636,000		$ 349,000
Other Real Estate Owned At Carrying Value	921,000	$ 1,802,000	1,226,000	$ 2,351,000
Real Estate Owned, Valuation Allowance, Amounts Applied	(23,000)	(9,000)
Real Estate Owned, Valuation Allowance, Valuation Increase	0	25,000
Real Estate Owned, Valuation Allowance	0	(321,000)	(23,000)	$ (305,000)
Other Real Estate, Disposals	(351,000)	(1,086,000)
Other Real Estate, Valuation Adjustments	0	(25,000)
Other Real Estate, Additions	46,000	$ 562,000
Other real estate owned at carrying value before valuation allowance	921,000		1,249,000
Multi Family Mortgage Loans [Member]
Other Real Estate Owned At Carrying Value	0		276,000
Real Estate Owned, Valuation Allowance	0		0
Other real estate owned at carrying value before valuation allowance	0		276,000
One to Four Family Residential Real Estate Loans [Member]
Other Real Estate Owned At Carrying Value	921,000		875,000
Real Estate Owned, Valuation Allowance	0		0
Other real estate owned at carrying value before valuation allowance	921,000		875,000
Nonresidential Real Estate [Member]
Other Real Estate Owned At Carrying Value	0		74,000
Real Estate Owned, Valuation Allowance	0		0
Other real estate owned at carrying value before valuation allowance	0		74,000
Land [Member]
Other Real Estate Owned At Carrying Value	0		1,000
Real Estate Owned, Valuation Allowance	0		(23,000)
Other real estate owned at carrying value before valuation allowance	0		24,000
Residential Real Estate [Member]
Repossessed Assets	$ 0		$ 0

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Mar. 31, 2018
Leases [Abstract]
Gross carrying amount	$ 6,694	$ 6,700	$ 0
Accumulated amortization	(212)
Net book value	6,482
Right of use lease obligations	$ 6,482	$ 6,700

LEASES Narrative (Details)

LEASES Narrative (Details)	Mar. 31, 2019
Leases [Abstract]
Weighted average remaining lease term - operating leases	9 years 6 months
Weighted average discount rate - operating leases	3.16%

LEASES Lease Costs (Details)

LEASES Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Amortization of right of use asset	$ 212	$ 0
Short-term lease cost	31
Sublease income	(6)
Total lease cost	237
Operating cash flows from operating leases	$ 223

LEASES Lease Maturity (Details)

LEASES Lease Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 892
2021	910
2022	930
2023	977
2024	827
Thereafter	3,099
Total future minimum operating lease payments	7,635
Amounts representing interest	(1,153)
Present value of net future minimum operating lease payments	$ 6,482	$ 6,700

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]
Carrying Value of Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Deposits Received for Securities Loaned	$ 1,106	$ 1,049
Federal Home Loan Bank Advances [Member] | Period One [Member]
Federal Home Loan Bank, Advances [Line Items]
Debt, Long-term and Short-term, Combined Amount	15,000	20,000
Collateral Pledged [Member]
Federal Home Loan Bank, Advances [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 2,600	$ 2,700

Fair Value - Financial Assets A

Fair Value - Financial Assets Accounted for at Fair Value (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0		$ 27,000
Schedule of Company's financial instruments measured at fair values
Total Fair value	83,240,000		88,179,000
Real Estate Acquired Through Foreclosure Fair Value			1,000
Real Estate Owned, Valuation Allowance, Valuation Increase	0	$ 25,000
Other real estate owned at carrying value before valuation allowance	921,000		1,249,000
Real Estate Owned, Valuation Allowance	0	$ 321,000	23,000	$ 305,000
Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	69,011,000		73,507,000
Equity Funds [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Residential Mortgage Backed Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	10,207,000		10,478,000
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	10,207,000
Collateralized Debt Obligations [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	3,511,000		3,685,000
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	3,511,000
Municipal Bonds [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	511,000		509,000
Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	83,240,000		88,179,000
Nonrecurring [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	69,011,000		73,507,000
Nonrecurring [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	10,207,000		10,478,000
Nonrecurring [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	3,511,000		3,685,000
Nonrecurring [Member] | Municipal Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	511,000		509,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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] | 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] | Municipal Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	83,240,000		88,179,000
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	69,011,000
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	10,207,000
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	3,511,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
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] | 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] | Municipal Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Commercial Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0		27,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment			270,000
Land Loans [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			1,000
Land Loans [Member] | Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			1,000
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
Land Loans [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			$ 1,000
Sales Comparison Valuation Technique [Member] | Land Loans [Member]
Schedule of Company's financial instruments measured at fair values
Fair Value Measurements, Valuation Processes, Description			Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description			Discount applied to valuation
Real estate owned, measurement input	0.123
Measurement Input, Comparability Adjustment [Member] | Maximum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]
Schedule of Company's financial instruments measured at fair values
Real estate owned, measurement input			0.1522
Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]
Schedule of Company's financial instruments measured at fair values
Real estate owned, measurement input			0.1100
Land [Member]
Schedule of Company's financial instruments measured at fair values
Other real estate owned at carrying value before valuation allowance	$ 0		$ 24,000
Real Estate Owned, Valuation Allowance	$ 0		$ 23,000

Fair Value - Assets Measured at

Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details)	3 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			$ 1,000
Other Real Estate Owned Write Downs	$ 0	$ 25,000
Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			1,000
Nonrecurring [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loan Fair Value			243,000
Nonrecurring [Member] | Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			1,000
Nonrecurring [Member] | Other Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure			3,427,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loan Fair Value			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Other Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure			0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loan Fair Value			243,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned			1,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure			$ 3,427,000
Sales Comparison Valuation Technique [Member] | Land Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate owned, measurement input	0.123
Measurement Input, Comparability Adjustment [Member] | Maximum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate owned, measurement input			0.1522
Measurement Input, Comparability Adjustment [Member] | Minimum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate owned, measurement input			(0.0366)
Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate owned, measurement input			0.1100

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 78,222	$ 98,204	$ 92,576	$ 127,592
Financial assets
Securities, carrying amount	83,240	88,179
Loans receivable, net of allowance for loan losses, carrying amounts	1,306,475	1,323,793
FHLBC stock, carrying amount	8,026	8,026
Accrued interest receivable, carrying amount	5,411	4,952
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Securities, carrying amount	83,240	88,179
Loans Receivable, Fair Value Disclosure	1,305,976	1,315,855
Accounts Receivable, Fair Value Disclosure	5,411	4,952
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	78,222	98,204
Demand Deposit Accounts Fair Value Disclosure	222,328	230,041
Deposits Savings Deposits Fair Value Disclosure	155,505	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	515,059
Certificates Of Deposit Fair Value Disclosure	433,096	436,598
Short Term Borrowings Fair Value Disclosure	16,105	21,050
Accrued Liabilities, Fair Value Disclosure	146	291
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	12,016	13,805
Demand Deposit Accounts Fair Value Disclosure		0
Deposits Savings Deposits 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] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Securities, carrying amount	83,240	88,179
Loans Receivable, Fair Value Disclosure	0	0
Accounts Receivable, Fair Value Disclosure		249
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	66,206	84,399
Demand Deposit Accounts Fair Value Disclosure	222,328	230,041
Deposits Savings Deposits Fair Value Disclosure	155,505	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	515,059
Certificates of Deposit, at Carrying Value	433,096
Certificates Of Deposit Fair Value Disclosure		436,598
Short-term Debt	16,105	21,050
Accrued Liabilities, Fair Value Disclosure	146	291
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure	1,305,976	1,315,855
Accounts Receivable, Fair Value Disclosure	5,092	4,703
Reported Value Measurement [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	78,222	98,204
Financial assets
Securities, carrying amount	83,240	88,179
Loans receivable, net of allowance for loan losses, carrying amounts	1,306,475	1,323,793
FHLBC stock, carrying amount	8,026	8,026
Accrued interest receivable, carrying amount	319	4,952
Financial liabilities
Demand Deposit Accounts	222,328	230,041
Deposits, Savings Deposits	155,505	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	515,059
Certificates of Deposit, at Carrying Value	433,854	438,328
Short-term Debt	16,106	21,049
Accrued Interest Payable	146	291
Equity Funds [Member]
Financial assets
Securities, carrying amount	$ 0	$ 0

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Income from product and service	$ 930	$ 978
Loan servicing fees	23	70
Mortgage brokerage and banking fees	28	71
Loss on sales of equity securities	0	0
Gain on sale of equity securities	295	0
Loss on disposal of other assets	(19)	0
Trust and insurance commissions and annuities income	205	213
Earnings on bank-owned life insurance	30	66
Other	132	141
Total noninterest income	1,624	$ 1,539
Credit and Debit Card
Revenue from External Customer [Line Items]
Income from product and service	$ 361