10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period ended March 31, 2018

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For transition period from             to             

Commission File Number 0-51331

BANKFINANCIAL CORPORATION

(Exact Name of Registrant as Specified in Charter)

Maryland	75-3199276
(State or Other Jurisdiction of Incorporation)	(I.R.S. Employer Identification No.)
15W060 North Frontage Road, Burr Ridge, Illinois 60527
(Address of Principal Executive Offices)

Registrant’s telephone number, including area code: (800) 894-6900

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨	Smaller reporting company	¨
		Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x.

Indicate the number of shares outstanding of each of the issuer’s classes of common stock as of the latest practicable date. At April 27, 2018, there were 17,739,054 shares of Common Stock, $0.01 par value, outstanding.

BANKFINANCIAL CORPORATION

Form 10-Q

March 31, 2018

Table of Contents

		Page Number
	PART I
Item 1.	Financial Statements	1
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3.	Quantitative and Qualitative Disclosure about Market Risk	38
Item 4.	Controls and Procedures	39
	PART II
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	40
Item 3.	Defaults Upon Senior Securities	40
Item 4.	Mine Safety Disclosures	40
Item 5.	Other Information	40
Item 6.	Exhibits	40
Signatures		42

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION

(In thousands, except share and per share data) - Unaudited

	March 31, 2018		December 31, 2017
Assets
Cash and due from other financial institutions	$	10,613	$	13,572
Interest-bearing deposits in other financial institutions	81,963		114,020
Cash and cash equivalents	92,576		127,592
Securities, at fair value	102,170		93,383
Equity securities, at fair value	491		—
Loans receivable, net of allowance for loan losses: March 31, 2018, $8,341 and December 31, 2017, $8,366	1,277,553		1,314,651
Other real estate owned, net	1,802		2,351
Stock in Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("FRB"), at cost	8,290		8,290
Premises held-for-sale	5,581		5,667
Premises and equipment, net	24,628		24,856
Accrued interest receivable	4,900		4,619
Core deposit intangible	164		286
Bank owned life insurance	22,925		22,859
Deferred taxes	11,363		12,563
Other assets	7,486		8,441
Total assets	$	1,559,929	$	1,625,558
Liabilities
Deposits
Noninterest-bearing	$	232,593	$	234,354
Interest-bearing	1,045,414		1,105,697
Total deposits	1,278,007		1,340,051
Borrowings	60,983		60,768
Advance payments by borrowers for taxes and insurance	9,558		11,645
Accrued interest payable and other liabilities	13,029		15,460
Total liabilities	1,361,577		1,427,924
Stockholders’ equity
Preferred Stock, $0.01 par value, 25,000,000 shares authorized, none issued or outstanding	—		—
Common Stock, $0.01 par value, 100,000,000 shares authorized; 17,877,223 shares issued at March 31, 2018 and 17,958,723 issued at December 31, 2017	178		179
Additional paid-in capital	152,489		153,811
Retained earnings	45,397		43,274
Accumulated other comprehensive income	288		370
Total stockholders’ equity	198,352		197,634
Total liabilities and stockholders’ equity	$	1,559,929	$	1,625,558

See accompanying notes to the consolidated financial statements.

1

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except share and per share data) - Unaudited

	Three Months Ended March 31,
	2018			2017
Interest and dividend income
Loans, including fees	$	13,820		$	12,760
Securities	464			349
Other	464			253
Total interest income	14,748			13,362
Interest expense
Deposits	1,525			1,180
Borrowings	202			96
Total interest expense	1,727			1,276
Net interest income	13,021			12,086
Provision for (recovery of) loan losses	(258		)	161
Net interest income after provision for (recovery of) loan losses	13,279			11,925
Noninterest income
Deposit service charges and fees	978			950
Loan fee income	70			60
Commercial mortgage brokerage fees	41			—
Residential mortgage banking fees	30			44
Trust and insurance commissions and annuities income	213			249
Earnings on bank owned life insurance	66			63
Other	141			178
Total noninterest income	1,539			1,544
Noninterest expense
Compensation and benefits	5,322			6,352
Office occupancy and equipment	1,731			1,622
Advertising and public relations	143			381
Information technology	641			753
Supplies, telephone, and postage	333			332
Amortization of intangibles	122			129
Nonperforming asset management	202			104
Operations of other real estate owned	161			213
FDIC insurance premiums	119			187
Other	1,185			1,193
Total noninterest expense	9,959			11,266
Income before income taxes	4,859			2,203
Income tax expense	1,300			322
Net income	$	3,559		$	1,881
Basic earnings per common share	$	0.20		$	0.10
Diluted earnings per common share	$	0.20		$	0.10
Weighted average common shares outstanding	17,930,639			18,642,054
Diluted weighted average common shares outstanding	17,931,100			18,647,516

See accompanying notes to the consolidated financial statements.

2

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands) - Unaudited

	Three Months Ended March 31,
	2018			2017
Net income	$	3,559		$	1,881
Unrealized holding loss arising during the period	(104		)	(20		)
Tax effect	22			7
Net of tax	(82		)	(13		)
Comprehensive income	$	3,477		$	1,868

See accompanying notes to the consolidated financial statements.

3

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(In thousands, except per share data) - Unaudited

	Common Stock			Additional Paid-in Capital			Retained Earnings			Unearned Employee Stock Ownership Plan Shares			Accumulated Other Comprehen-sive Income			Total
Balance at January 1, 2017	$	192		$	173,047		$	39,483		$	(8,318	)	$	376		$	204,780
Net income	—			—			1,881			—			—			1,881
Other comprehensive loss, net of tax	—			—			—			—			(13		)	(13		)
Net exercise of stock options (192,215 shares)	2			(1,220		)	—			—			—			(1,218		)
Prepayment of ESOP Share Acquisition Loan	(8		)	(7,185		)				8,318			—			1,125
Repurchase and retirement of common stock (232,045 shares)	(2		)	(3,377		)	—			—			—			(3,379		)
Cash dividends declared on common stock ($0.06 per share)	—			—			(1,155		)	—			—			(1,155		)
Balance at March 31, 2017	$	184		$	161,265		$	40,209		$	—		$	363		$	202,021
Balance at January 1, 2018	$	179		$	153,811		$	43,274		$	—		$	370		$	197,634
Net income	—			—			3,559			—			—			3,559
Other comprehensive loss, net of tax	—			—			—			—			(82		)	(82		)
Repurchase and retirement of common stock (81,500 shares)	(1		)	(1,322		)	—			—			—			(1,323		)
Cash dividends declared on common stock ($0.08 per share)	—			—			(1,436		)	—			—			(1,436		)
Balance at March 31, 2018	$	178		$	152,489		$	45,397		$	—		$	288		$	198,352

See accompanying notes to the consolidated financial statements.

4

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands) - Unaudited

	Three Months Ended March 31,
	2018			2017
Cash flows from operating activities
Net income	$	3,559		$	1,881
Adjustments to reconcile to net income to net cash from operating activities
Provision for (recovery of) loan losses	(258		)	161
Prepayment of ESOP Share Acquisition Loan	—			1,125
Depreciation and amortization	916			958
Amortization of premiums and discounts on securities and loans	3			(65		)
Amortization of core deposit intangible	122			129
Amortization of servicing assets	27			31
Net change in net deferred loan origination costs	36			129
Loss on sale of other real estate owned	21			16
Net gain on sale of loans	—			(7		)
Loans originated for sale	—			(239		)
Proceeds from sale of loans	—			246
Other real estate owned valuation adjustments	25			20
Net change in:
Accrued interest receivable	(281		)	(97		)
Earnings on bank owned life insurance	(66		)	(63		)
Other assets	2,037			1,834
Accrued interest payable and other liabilities	(2,431		)	(2,701		)
Net cash from operating activities	3,710			3,358
Cash flows from investing activities
Securities
Proceeds from maturities	27,499			13,623
Proceeds from principal repayments	1,030			637
Purchases of securities	(37,923		)	(17,302		)
Loans receivable
Loan participations sold	—			1,615
Principal payments on loans receivable	226,439			136,090
Purchase of loans	—			(20,406		)
Originated for investment	(189,659		)	(125,813		)
Proceeds of redemption of FHLB stock	—			3,514
Purchase of FHLB and FRB stock	—			(11		)
Proceeds from sale of other real estate owned	713			494
Purchase of premises and equipment, net	(150		)	(179		)
Net cash from (used in) investing activities	27,949			(7,738		)

Continued

5

BANKFINANCIAL CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands) - Unaudited

	Three Months Ended March 31,
	2018			2017
Cash flows from financing activities
Net change in deposits	$	(62,044	)	$	(10,108	)
Net change in borrowings	215			977
Net change in advance payments by borrowers for taxes and insurance	(2,087		)	(1,973		)
Repurchase and retirement of common stock	(1,323		)	(3,379		)
Cash dividends paid on common stock	(1,436		)	(1,155		)
Shares retired for tax liability	—			(1,200		)
Net cash used in financing activities	(66,675		)	(16,838		)
Net change in cash and cash equivalents	(35,016		)	(21,218		)
Beginning cash and cash equivalents	127,592			96,684
Ending cash and cash equivalents	$	92,576		$	75,466
Supplemental disclosures of cash flow information:
Interest paid	$	1,694		$	1,243
Income taxes paid	43			1
Loans transferred to other real estate owned	562			1,936

See accompanying notes to the consolidated financial statements.

6

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation: BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, 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, 2018 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2018 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.

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, 2017, as filed with the Securities and Exchange Commission.

Recent Accounting Pronouncements

In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update became effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. We have evaluated the impact of adopting the update and have concluded that it does not have a significant impact to our consolidated financial statements. The Company’s revenue streams that are in-scope from the update include: financed OREO sales; deposit fees, including ATM fees, overdraft fees, maintenance fees and dormancy fees; debit card fees, and trust fees. For the in-scope revenue streams, our current revenue recognition is not different than our prior revenue recognition under the update. The Company has infrequently financed an OREO sale. Our customer contracts generally do not have performance obligations and fees are assessed and collected as the transaction occurs. The Company’s fee income is not material for any individual income streams. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue stream; as such, no cumulative effect adjustment was recorded. Refer to Note 8 - Revenue for Contracts with Customers for further discussion on the Company's accounting policies for revenue sources within the scope of ASC 606.

In January 2016, the FASB issued an update (ASU No. 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Liabilities). The new guidance is intended to improve the recognition and measurement of financial instruments by requiring: equity investments (other than equity method or consolidation) to be measured at fair value with changes in fair value recognized in net income; public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; eliminating the requirement for non-public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is to be required to be disclosed for financial instruments measured at amortized

7

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued)

cost on the balance sheet; and requiring a reporting organization to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance became effective for public business entities for fiscal years beginning after December 15, 2017. The new pronouncement does not have a significant impact on our Statement of Operations, as we only have one equity security that was valued at $491,000 and $499,000 at March 31, 2018 and December 31, 2017, respectively. The equity security is reported separately on the Statement of Condition as a result the adoption of this pronouncement.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. ASU 2016-02 is effectivefor fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our consolidated financial statements as the projected minimum lease payments under existing leases subject to the new pronouncement are less than one percent of our current total assets.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”).  These amendments require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration.  ASU 2016-13 is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 (i.e., January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our initial review indicates that we have maintained sufficient historical loan data to support the requirements of this pronouncement. In addition, we have begun tracking the average life of the various segments of our loan portfolio. We are currently evaluating various loss methodologies to determine their correlation to our various loan categories' historical performance.

In March of 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“ASU 2017-08”). This guidance shortens the amortization period for premiums on certain callable debt securities to the earliest call date (with an explicit, noncontingent call feature that is callable at a fixed price and on a preset dates), rather than contractual maturity date as currently required under GAAP. The ASU does not impact instruments without preset call dates such as mortgage-backed securities.  For instruments with contingent call features, once the contingency is resolved and the security is callable at a fixed price and preset date, the security is within the scope of the ASU.  ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted.  Effective January 2017, we early adopted the pronouncement. Adoption of the new pronouncement was immaterial to the consolidated financial statements.

8

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 2 - EARNINGS PER SHARE

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 unearned BankFinancial, NA Employee Stock Ownership Plan (the "ESOP") shares in 2017 and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock.

	Three Months Ended March 31,
	2018			2017
Net income available to common stockholders	$	3,559		$	1,881
Average common shares outstanding	17,931,579			19,243,941
Less:
Unearned ESOP shares	—			(600,947		)
Unvested restricted stock shares	(940		)	(940		)
Weighted average common shares outstanding	17,930,639			18,642,054
Add - Net effect of dilutive unvested restricted stock	461			5,462
Diluted weighted average common shares outstanding	17,931,100			18,647,516
Basic earnings per common share	$	0.20		$	0.10
Diluted earnings per common share	$	0.20		$	0.10

NOTE 3 - 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
March 31, 2018
Certificates of deposit	$	86,340	$	—	$	—		$	86,340
Mortgage-backed securities - residential	11,146		441		(43		)	11,544
Collateralized mortgage obligations - residential	4,272		16		(11		)	4,277
SBA-guaranteed loan participation certificates	9		—		—			9
	$	101,767	$	457	$	(54	)	$	102,170
December 31, 2017
Certificates of deposit	$	75,916	$	—	$	—		$	75,916
Equity mutual fund	500		—		(1		)	499
Mortgage-backed securities - residential	11,969		520		(17		)	12,472
Collateralized mortgage obligations - residential	4,481		16		(11		)	4,486
SBA-guaranteed loan participation certificates	10		—		—			10
	$	92,876	$	536	$	(29	)	$	93,383

9

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 3 - SECURITIES (continued)

The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at March 31, 2018 and December 31, 2017.

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, 2018
	Amortized Cost		Fair Value
Due in one year or less	$	86,340	$	86,340
Mortgage-backed securities - residential	11,146		11,544
Collateralized mortgage obligations - residential	4,272		4,277
SBA-guaranteed loan participation certificates	9		9
	$	101,767	$	102,170

There were no sales of securities for the periods ended March 31, 2018 and 2017.

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, 2018
Mortgage-backed securities - residential	$	—	$	—		$	1,111	$	(43	)	$	1,111	$	(43	)
Collateralized mortgage obligations - residential	—		—			1,983		(11		)	1,983		(11		)
	$	—	$	—		$	3,094	$	(54	)	$	3,094	$	(54	)
December 31, 2017
Equity mutual fund	$	499	$	(1	)	$	—	$	—		$	499	$	(1	)
Mortgage-backed securities - residential	—		—			1,149		(17		)	1,149		(17		)
Collateralized mortgage obligations - residential	—		—			2,083		(11		)	2,083		(11		)
	$	499	$	(1	)	$	3,232	$	(28	)	$	3,731	$	(29	)

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, 2018, 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.

10

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE

Loans receivable are as follows:

	March 31, 2018			December 31, 2017
One-to-four family residential real estate	$	92,056		$	97,814
Multi-family mortgage	578,144			588,383
Nonresidential real estate	163,856			169,971
Construction and land	1,328			1,358
Commercial loans	162,564			152,552
Commercial leases	285,222			310,076
Consumer	1,494			1,597
	1,284,664			1,321,751
Net deferred loan origination costs	1,230			1,266
Allowance for loan losses	(8,341		)	(8,366		)
Loans, net	$	1,277,553		$	1,314,651

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, 2018
One-to-four family residential real estate	$	—	$	765	$	765	$	3,576	$	88,480	$	92,056
Multi-family mortgage	—		3,866		3,866		947		577,197		578,144
Nonresidential real estate	—		1,577		1,577		—		163,856		163,856
Construction and land	—		32		32		—		1,328		1,328
Commercial loans	—		1,441		1,441		—		162,564		162,564
Commercial leases	—		650		650		—		285,222		285,222
Consumer	—		10		10		—		1,494		1,494
	$	—	$	8,341	$	8,341	$	4,523	$	1,280,141	1,284,664
Net deferred loan origination costs											1,230
Allowance for loan losses											(8,341		)
Loans, net											$	1,277,553

11

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

	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, 2017
One-to-four family residential real estate	$	—	$	850	$	850	$	4,265	$	93,549	$	97,814
Multi-family mortgage	—		3,849		3,849		949		587,434		588,383
Nonresidential real estate	—		1,605		1,605		—		169,971		169,971
Construction and land	—		32		32		—		1,358		1,358
Commercial loans	—		1,357		1,357		—		152,552		152,552
Commercial leases	—		655		655		—		310,076		310,076
Consumer	—		18		18		—		1,597		1,597
	$	—	$	8,366	$	8,366	$	5,214	$	1,316,537	1,321,751
Net deferred loan origination costs											1,266
Allowance for loan losses											(8,366		)
Loans, net											$	1,314,651

Activity in the allowance for loan losses is as follows:

	Three Months Ended March 31,
	2018			2017
Beginning balance	$	8,366		$	8,127
Loans charged off:
One-to-four family residential real estate	(97		)	(171		)
Multi-family mortgage	—			(3		)
Nonresidential real estate	—			(165		)
	(97		)	(339		)
Recoveries:
One-to-four family residential real estate	99			6
Multi-family mortgage	8			11
Commercial loans	223			5
	330			22
Net recoveries (charge-offs)	233			(317		)
Provision for (recovery of) loan losses	(258		)	161
Ending balance	$	8,341		$	7,971

12

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

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 March 31, 2018
	Loan Balance		Recorded Investment		Partial Charge-off		Allowance for Loan Losses Allocated		Average Investment in Impaired Loans		Interest Income Recognized
March 31, 2018
With no related allowance recorded:
One-to-four family residential real estate	$	4,211	$	3,556	$	651	$	—	$	4,002	$	15
Multi-family mortgage - Illinois	952		950		—		—		952		11
	$	5,163	$	4,506	$	651	$	—	$	4,954	$	26

									Year ended December 31, 2017
	Loan Balance		Recorded Investment		Partial Charge-off		Allowance for Loan Losses Allocated		Average Investment in Impaired Loans		Interest Income Recognized
December 31, 2017
With no related allowance recorded:
One-to-four family residential real estate	$	5,049	$	4,248	$	806	$	—	$	4,212	$	197
Multi-family mortgage - Illinois	958		948		—		—		847		41
	$	6,007	$	5,196	$	806	$	—	$	5,059	$	238

13

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

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, 2018
One-to-four family residential real estate	$	1,675	$	1,543	$	—
One-to-four family residential real estate – non-owner occupied	86		46		—
Multi-family mortgage - Illinois	375		369		—
	$	2,136	$	1,958	$	—
December 31, 2017
One-to-four family residential real estate	$	3,413	$	1,918	$	—
One-to-four family residential real estate – non-owner occupied	308		109		—
Multi-family mortgage - Illinois	376		363		—
	$	4,097	$	2,390	$	—

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 $76,000 and $103,000 at March 31, 2018 and December 31, 2017, 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.

14

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

Past Due Loans

The following tables present the aging of the recorded investment of loans at March 31, 2018 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	$	1,875	$	58	$	1,398	$	3,331	$	68,216	$	71,547
One-to-four family residential real estate loans – non-owner occupied	368		10		46		424		19,676		20,100
Multi-family mortgage - Illinois	268		—		271		539		273,950		274,489
Multi-family mortgage - Other	—		—		—		—		299,725		299,725
Nonresidential real estate	940		—		—		940		161,265		162,205
Construction	—		—		—		—		1,096		1,096
Land	—		—		—		—		234		234
Commercial loans:
Regional commercial banking	—		—		—		—		48,160		48,160
Health care	—		—		—		—		69,980		69,980
Direct commercial lessor	—		—		—		—		44,939		44,939
Commercial leases:
Investment rated commercial leases	1,727		152		—		1,879		185,386		187,265
Other commercial leases	572		255		—		827		98,900		99,727
Consumer	—		22		—		22		1,481		1,503
	$	5,750	$	497	$	1,715	$	7,962	$	1,273,008	$	1,280,970

15

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

The following tables present the aging of the recorded investment of loans at December 31, 2017 by class of loans:

	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater Past Due		Total Past Due		Loans Not Past Due		Total
One-to-four family residential real estate loans	$	86	$	99	$	1,801	$	1,986	$	74,216	$	76,202
One-to-four family residential real estate loans – non-owner occupied	10		3		86		99		20,944		21,043
Multi-family mortgage - Illinois	172		—		364		536		287,171		287,707
Multi-family mortgage - Other	—		—		—		—		296,440		296,440
Nonresidential real estate	608		—		—		608		166,071		166,679
Construction	—		—		—		—		1,103		1,103
Land	—		—		—		—		259		259
Commercial loans:
Regional commercial banking	—		—		—		—		40,935		40,935
Health care	—		—		—		—		71,738		71,738
Direct commercial lessor	—		—		—		—		40,237		40,237
Commercial leases:
Investment rated commercial leases	934		—		—		934		207,747		208,681
Other commercial leases	288		—		—		288		102,873		103,161
Consumer	—		—		—		—		1,605		1,605
	$	2,098	$	102	$	2,251	$	4,451	$	1,311,339	$	1,315,790

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 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, 2018 and December 31, 2017. No specific valuation reserves were allocated to those loans at March 31, 2018 and December 31, 2017. 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, 2018		December 31, 2017
One-to-four family residential real estate - nonaccrual	$	17	$	17

During the three months endedMarch 31, 2018 and 2017, there were no loans modified and classified as TDRs.

A TDR is considered to be in payment default once it is 90 days contractually past due under the modified terms.

There were no payment defaults on TDRs during the three months endedMarch 31, 2018 and 2017 within twelve months following the modification.

16

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

There were no loan modifications during the three months endedMarch 31, 2018. There were certain loan modifications during the three months endedMarch 31, 2017 that did not meet the definition of a TDR. These loans had a total recorded investment of $133,000 at March 31, 2017. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant.

In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy.

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.

17

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 4 - LOANS RECEIVABLE (continued)

As of March 31, 2018, based on the most recent analysis performed, the risk categories of loans by class of loans are as follows:

	Pass		Special Mention		Substandard		Nonaccrual		Total
One-to-four family residential real estate loans	$	70,004	$	—	$	323	$	1,539	$	71,866
One-to-four family residential real estate loans – non-owner occupied	20,105		—		39		46		20,190
Multi-family mortgage loans - Illinois	275,552		—		222		370		276,144
Multi-family mortgage loans - Other	302,000		—		—		—		302,000
Nonresidential real estate loans	163,707		—		149		—		163,856
Construction loans	1,093		—		—		—		1,093
Land loans	235		—		—		—		235
Commercial loans:
Regional commercial banking	43,467		4,644		—		—		48,111
Health care	67,669		—		2,258		—		69,927
Direct commercial lessor	44,526		—		—		—		44,526
Commercial leases:
Investment rated commercial leases	186,052		—		—		—		186,052
Other commercial leases	99,170		—		—		—		99,170
Consumer	1,494		—		—		—		1,494
	$	1,275,074	$	4,644	$	2,991	$	1,955	$	1,284,664

As of December 31, 2017, 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	$	74,437	$	—	$	255	$	1,914	$	76,606
One-to-four family residential real estate loans – non-owner occupied	21,059		—		40		109		21,208
Multi-family mortgage loans - Illinois	290,765		—		225		368		291,358
Multi-family mortgage loans - Other	297,025		—		—		—		297,025
Nonresidential real estate loans	169,817		—		154		—		169,971
Construction loans	1,099		—		—		—		1,099
Land loans	259		—		—		—		259
Commercial loans:
Regional commercial banking	36,373		4,528		—		—		40,901
Health care	69,480		—		2,248		—		71,728
Direct commercial lessor	39,923		—		—		—		39,923
Commercial leases:
Investment rated commercial leases	207,460		—		—		—		207,460
Other commercial leases	102,616		—		—		—		102,616
Consumer	1,597		—		—		—		1,597
	$	1,311,910	$	4,528	$	2,922	$	2,391	$	1,321,751

18

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 5 - OTHER REAL ESTATE OWNED

Real 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, 2018							December 31, 2017
	Balance		Valuation Allowance			Net OREO Balance		Balance		Valuation Allowance			Net OREO Balance
One–to–four family residential	$	935	$	—		$	935	$	836	$	(9	)	$	827
Nonresidential real estate	1,140		(277		)	863		1,772		(252		)	1,520
Land	48		(44		)	4		48		(44		)	4
	$	2,123	$	(321	)	$	1,802	$	2,656	$	(305	)	$	2,351

The following represents the roll forward of OREO and the composition of OREO properties:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	2,351		$	3,895
New foreclosed properties	562			1,936
Valuation adjustments	(25		)	(20		)
Sales and payments	(1,086		)	(510		)
Ending balance	$	1,802		$	5,301

Activity in the valuation allowance is as follows:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	305		$	449
Additions charged to expense	25			20
Reductions from sales of OREO	(9		)	(59		)
Ending balance	$	321		$	410

At March 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 December 31, 2017 the balance of OREO included $352,000 foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property without title. At March 31, 2018 and December 31, 2017, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $1.3 million and $1.5 million, respectively.

19

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 6 - 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, 2018
Repurchase agreements and repurchase-to-maturity transactions	$	983	$	—	$	—	$	—	$	983
Gross amount of recognized liabilities for repurchase agreements in Statement of Condition									$	983
December 31, 2017
Repurchase agreements and repurchase-to-maturity transactions	$	768	$	—	$	—	$	—	$	768
Gross amount of recognized liabilities for repurchase agreements in Statement of Condition									$	768

Securities sold under agreements to repurchase were secured by mortgage-backed securities with a carrying amount of $3.3 million and $3.7 million at March 31, 2018 and December 31, 2017, respectively. Also included in total borrowings were advances from the FHLB of $60.0 million at March 31, 2018 and December 31, 2017.

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.

NOTE 7 – FAIR VALUE

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values:

• Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

• Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

• Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

The Company used the following methods and significant assumptions to estimate the fair value of each type of financial instrument:

Securities: The fair values of marketable equity securities are generally determined by quoted prices, in active markets, for each specific security (Level 1). If Level 1 measurement inputs are not available for a marketable equity security, we determine its fair value based on the quoted price of a similar security traded in an active market (Level 2). The fair values of debt securities are generally determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities, but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2).

Impaired Loans: The fair value of impaired loans with specific allocations of the allowance for loan losses is generally based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted in accordance with the allowance policy.

20

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 7 - FAIR VALUE (continued)

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, 2018
Securities:
Certificates of deposit	$	—	$	86,340	$	—	$	86,340
Equity mutual fund	491		—		—		491
Mortgage-backed securities – residential	—		11,544		—		11,544
Collateralized mortgage obligations – residential	—		4,277		—		4,277
SBA-guaranteed loan participation certificates	—		9		—		9
	$	491	$	102,170	$	—	$	102,661
December 31, 2017
Securities:
Certificates of deposit	$	—	$	75,916	$	—	$	75,916
Equity mutual fund	499		—		—		499
Mortgage-backed securities - residential	—		12,472		—		12,472
Collateralized mortgage obligations – residential	—		4,486		—		4,486
SBA-guaranteed loan participation certificates	—		10		—		10
	$	499	$	92,884	$	—	$	93,383

21

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 7 - FAIR VALUE (continued)

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
March 31, 2018
Other real estate owned - nonresidential real estate	$	—	$	—	$	409	$	409
December 31, 2017
Other real estate owned:
One-to-four family residential real estate	$	—	$	—	$	102	$	102
Nonresidential real estate	—		—		814		814
	$	—	$	—	$	916	$	916

At March 31, 2018 and December 31, 2017 there were no impaired loans that were measured for impairment using the fair value of the collateral for collateral–dependent loans and which had specific valuation allowances.

OREO, which is carried at the lower of cost or fair value less costs to sell, had a carrying value of $494,000 less a valuation allowance of $85,000, or $409,000, at March 31, 2018, compared to a carrying value of $1.2 million less a valuation allowance of $261,000, or $916,000, at December 31, 2017. There were $25,000 and $20,000 of valuation adjustments of OREO recorded for the three months endedMarch 31, 2018 and 2017, respectively.

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:

	Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range (Weighted Average)
March 31, 2018
Other real estate owned - nonresidential real estate loans	$	409	Sales comparison	Comparison between sales and income approaches	12.70% to 26.77% (13.7%)
December 31, 2017
Other real estate owned
One-to-four family residential real estate	$	102	Sales comparison	Discount applied to valuation	5.6%
Nonresidential real estate	814		Sales comparison	Comparison between sales and income approaches	-3.66% to 15.22% (11.0%)
	$	916

22

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 7 - FAIR VALUE (continued)

The carrying amount and estimated fair value of financial instruments are as follows:

			Fair Value Measurements at March 31, 2018 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	92,576	$	10,613	$	81,963	$	—	$	92,576
Securities	102,661		491		102,170		—		102,661
Loans receivable, net of allowance for loan losses	1,277,553		—		—		1,276,635		1,276,635
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,900		—		4,900		—		4,900
Financial liabilities
Noninterest-bearing demand deposits	$	232,593	$	—	$	232,593	$	—	$	232,593
NOW and money market accounts	573,886		—		573,886		—		573,886
Savings deposits	160,093		—		160,093		—		160,093
Certificates of deposit	311,435		—		308,904		—		308,904
Borrowings	60,983		—		60,832		—		60,832
Accrued interest payable	180		—		180		—		180

			Fair Value Measurements at  December 31, 2017 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	127,592	$	13,572	$	114,020	$	—	$	127,592
Securities	93,383		499		92,884		—		93,383
Loans receivable, net of allowance for loan losses	1,314,651		—		1,323,139		—		1,323,139
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,619		—		4,619		—		4,619
Financial liabilities
Noninterest-bearing demand deposits	$	234,354	$	—	$	234,354	$	—	$	234,354
NOW and money market accounts	589,238		—		589,238		—		589,238
Savings deposits	160,501		—		160,501		—		160,501
Certificates of deposit	355,958		—		353,969		—		353,969
Borrowings	60,768		—		60,627		—		60,627
Accrued interest payable	147		—		147		—		147

For purposes of the above, the following assumptions were used:

Cash and Cash Equivalents: The estimated fair values for cash and cash equivalents are based on their carrying value due to the short-term nature of these assets.

Loans: At March 31, 2018, 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.

23

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 7 - FAIR VALUE (continued)

At December 31, 2017, the estimated fair value for loans has been determined by calculating the present value of future cash flows based on the current rate the Company would charge for similar loans with similar maturities, applied for an estimated time period until the loan is assumed to be repriced or repaid. The methods utilized to estimate fair value of loans do not necessarily represent an exit price.

FHLB and FRB Stock: It is not practicable to determine the fair value of FHLB and FRB stock due to the restrictions placed on their transferability.

Deposit Liabilities: The estimated fair value for certificates of deposit has been determined by calculating the present value of future cash flows based on estimates of rates the Company would pay on such deposits, applied for the time period until maturity. The estimated fair values of noninterest-bearing demand, NOW, money market, and savings deposits are assumed to approximate their carrying values as management establishes rates on these deposits at a level that approximates the local market area. Additionally, these deposits can be withdrawn on demand.

Borrowings: The estimated fair values of advances from the FHLB and notes payable are based on current market rates for similar financing. The estimated fair value of securities sold under agreements to repurchase is assumed to equal its carrying value due to the short-term nature of the liability.

Accrued Interest: The estimated fair values of accrued interest receivable and payable are assumed to equal their carrying value.

Off-Balance-Sheet Instruments: Off-balance-sheet items consist principally of unfunded loan commitments, standby letters of credit, and unused lines of credit. The estimated fair values of unfunded loan commitments, standby letters of credit, and unused lines of credit are not material.

While the above estimates are based on management’s judgment of the most appropriate factors, as of the balance sheet date, there is no assurance that the estimated fair values would have been realized if the assets were disposed of or the liabilities settled at that date, since market values may differ depending on the various circumstances. The estimated fair values would also not apply to subsequent dates.

In addition, other assets and liabilities that are not financial instruments, such as premises and equipment, are not included in the above disclosures.

NOTE 8 – 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 for the three months endedMarch 31, 2018 and 2017. Items outside of the scope of the ASC 606 are noted as such.

	Three Months Ended March 31,
	2018		2017
Deposit service charges and fees	$	978	$	950
Loan fee income (1)	70		60
Commercial mortgage brokerage fees (1)	41		—
Residential mortgage banking fees (1)	30		44
Trust and insurance commissions and annuities income	213		249
Earnings on bank owned life insurance (1)	66		63
Other (1)	141		178
Total noninterest income	$	1,539	$	1,544

(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 for transaction-based, 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

24

BANKFINANCIAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Table amounts in thousands, except share and per share data)

NOTE 8 – REVENUE FROM CONTRACTS WITH CUSTOMERS (continued)

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 for the three months endedMarch 31, 2018 and 2017 were $361,000 and $350,000, respectively. These are 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 endedMarch 31, 2018 and March 31, 2017 were not financed by the Bank.

NOTE 9 - SUBSEQUENT EVENTS

In April 2018, the Bank recorded income from a death benefit on BOLI of $1.4 million related to the death of a former Bank executive.

On April 23, 2018, the Bank sold its office building located at 15W060 North Frontage Road, Burr Ridge, Illinois, for a purchase price of $6 million.  A net gain in the approximate amount $100,000will be recorded in the second quarter of 2018 in connection with the sale.  Concurrently with the sale, the Bank entered into a six-month lease of the office building with the purchaser, and intends to lease space in a different building following the expiration of the lease with the purchaser.  The Company shares space with the Bank in the office building pursuant to an expense allocation agreement.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Cautionary Statement Regarding Forward-Looking Information

Forward Looking Statements

This Quarterly Report on Form 10-Q contains, and other periodic and current reports, press releases and other public stockholder communications of BankFinancial Corporation may contain, forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, that involve significant risks and uncertainties. Forward-looking statements may include statements relating to our future plans, strategies and expectations, as well as our future revenues, earnings, losses, financial performance, financial condition, asset quality metrics and future prospects. Forward looking statements are generally identifiable by use of the words “believe,” “may,” “will,” “should,” “could,” “expect,” “estimate,” “intend,” “anticipate,” “preliminary,” “project,” “plan,” or similar expressions. Forward looking statements speak only as of the date made. They are frequently based on assumptions that may or may not materialize, and are subject to numerous uncertainties that could cause actual results to differ materially from those anticipated in the forward looking statements. We intend all forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995, and are including this statement for the purpose of invoking these safe harbor provisions.

Factors that could cause actual results to differ materially from the results anticipated or projected and which could materially and adversely affect our operating results, financial condition or future prospects include, but are not limited to: (i) less than anticipated loan growth due to intense competition for high quality loans and leases, particularly in terms of pricing and credit underwriting,

25

or a dearth of borrowers who meet our underwriting standards; (ii) the impact of re-pricing and competitors’ pricing initiatives on loan and deposit products; (iii) interest rate movements and their impact on the economy, customer behavior and our net interest margin; (iv) adverse economic conditions in general, in the Chicago metropolitan area in particular and in other market areas where we operate that could result in increased delinquencies in our loan portfolio or a decline in the value of our investment securities and the collateral for our loans; (v) declines in real estate values that adversely impact the value of our loan collateral, OREO, asset dispositions and the level of borrower equity in their investments; (vi) borrowers that experience legal or financial difficulties that we do not currently foresee; (vii) results of supervisory monitoring or examinations by regulatory authorities, including the possibility that a regulatory authority could, among other things, require us to increase our allowance for loan losses or adversely change our loan classifications, write-down assets, reduce credit concentrations or maintain specific capital levels; (viii) changes, disruptions or illiquidity in national or global financial markets; (ix) the credit risks of lending activities, including risks that could cause changes in the level and direction of loan delinquencies and charge-offs or changes in estimates relating to the computation of our allowance for loan losses; (x) monetary and fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the Federal Reserve Board; (xi) factors affecting our ability to access deposits or cost-effective funding, and the impact of competitors' pricing initiatives on our deposit products; (xii) the impact of new legislation or regulatory changes, including the Dodd-Frank Act and Basel III, on our products, services, operations and operating expenses; (xiii) higher federal deposit insurance premiums; (xiv) higher than expected overhead, infrastructure and compliance costs; (xv) changes in accounting principles, policies or guidelines; and (xvi) privacy and cybersecurity risks, including the risks of business interruption and the compromise of confidential customer information resulting from intrusions.

These risks and uncertainties, together with the Risk Factors and other information set forth in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and this Quarterly Report on Form 10-Q, as well as other filings we make with the SEC, should be considered in evaluating forward-looking statements and undue reliance should not be placed on such statements. We do not undertake any obligation to update any forward-looking statement in the future, or to reflect circumstances and events that occur after the date on which the forward-looking statement was made.

Critical Accounting Policies

Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and could potentially result in materially different results under different assumptions and conditions. We believe that the most critical accounting policies upon which our financial condition and results of operation depend, and which involve the most complex subjective decisions or assessments, are included in the discussion entitled “Critical Accounting Policies” in Item 7, “Management's Discussion and Analysis of Financial Condition and Results of Operations,” in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017, as filed with the SEC.

Overview

Results of operations improved in the first quarter of 2018 due to a more favorable mix of loans and deposits, combined with a continuing focus on risk allocation within loan portfolio segments. Total loans declined as strong originations in commercial and industrial loans and modest originations of multi-family loans and commercial leases were offset by elevated repayments of lower-yielding commercial leases and multi-family loans. Total commercial and industrial loans increased by 7% on a linked-quarter basis despite significant volatility in line usage during the quarter. We expect continued growth in commercial and industrial loan originations and a resumption of growth in multi-family loans and commercial lease originations in the second quarter of 2018 and during the remainder of the year.

We recorded a slight decrease to our allowance for loan losses in the first quarter of 2018 due to recoveries on previously charged-off loans. Based on the current loan portfolio composition and activity, we expect net interest margin to be within a range of 3.40% to 3.60% depending on loan growth and balance composition, and deposit portfolio composition and growth.

Noninterest income decreased modestly due to seasonal factors in deposit-account related fee income, and lower loan fee income related to loan originations activity. Additional growth in commercial and industrial lending, together with new product development within commercial leasing, multi-family/commercial real estate and trust operations, may contribute to growth in non-interest income in future quarters.

Noninterest expense increased due to higher compensation related to base compensation and annual performance reviews, and increased expenses relating to collection litigation and the final resolution of OREO properties. Other non-interest expenses remained well-contained.

26

Our ratio of nonperforming loans to total loans was 0.15% and our ratio of non-performing assets to total assets was 0.24% at March 31, 2018. We expect continued reductions of the OREO balance and scheduled pending resolutions may further improve our asset quality.

27

SELECTED FINANCIAL DATA

The following summary information is derived from the consolidated financial statements of the Company. For additional information, reference is made to the Consolidated Financial Statements of the Company and related notes included elsewhere in this Quarterly Report.

	March 31, 2018		December 31, 2017		Change
	(Dollars in thousands)
Selected Financial Condition Data:
Total assets	$	1,559,929	$	1,625,558	$	(65,629	)
Loans, net	1,277,553		1,314,651		(37,098		)
Securities, at fair value	102,661		93,383		9,278
Other real estate owned, net	1,802		2,351		(549		)
Deposits	1,278,007		1,340,051		(62,044		)
Borrowings	60,983		60,768		215
Equity	198,352		197,634		718

	Three Months Ended March 31,
	2018			2017		Change
	(Dollars in thousands)
Selected Operating Data:
Interest income	$	14,748		$	13,362	$	1,386
Interest expense	1,727			1,276		451
Net interest income	13,021			12,086		935
Provision for (recovery of) loan losses	(258		)	161		(419		)
Net interest income after provision for (recovery of) loan losses	13,279			11,925		1,354
Noninterest income	1,539			1,544		(5		)
Noninterest expense	9,959			11,266		(1,307		)
Income before income tax expense	4,859			2,203		2,656
Income tax expense	1,300			322		978
Net income	$	3,559		$	1,881	$	1,678

28

	Three Months Ended March 31,
	2018			2017
Selected Financial Ratios and Other Data:
Performance Ratios:
Return on assets (ratio of net income to average total assets) (1)	0.90		%	0.47		%
Return on equity (ratio of net income to average equity) (1)	7.13			3.66
Average equity to average assets	12.62			12.87
Net interest rate spread (1) (2)	3.38			3.15
Net interest margin (1) (3)	3.53			3.26
Efficiency ratio (4)	68.40			82.66
Noninterest expense to average total assets (1)	2.52			2.82
Average interest-earning assets to average interest-bearing liabilities	132.29			132.57
Dividends declared per share	$	0.08		$	0.06
Dividend payout ratio	40.35		%	61.42		%

	At March 31, 2018		At December 31, 2017
Asset Quality Ratios:
Nonperforming assets to total assets (5)	0.24	%	0.29	%
Nonperforming loans to total loans	0.15		0.18
Allowance for loan losses to nonperforming loans	426.00		350.04
Allowance for loan losses to total loans	0.65		0.63
Capital Ratios:
Equity to total assets at end of period	12.72	%	12.16	%
Tier 1 leverage ratio (Bank only)	11.60	%	11.08	%
Other Data:
Number of full-service offices	19		19
Employees (full-time equivalents)	237		236

(1) Ratios annualized.

(2) The net interest rate spread represents the difference between the yield on average interest-earning assets and the cost of average interest-bearing liabilities for the period.

(3) The net interest margin represents net interest income divided by average total interest-earning assets for the period.

(4) The efficiency ratio represents noninterest expense, divided by the sum of net interest income and noninterest income.

(5) Nonperforming assets include nonperforming loans and other real estate owned.

Comparison of Financial Condition at March 31, 2018 and December 31, 2017

Total assets decreased $65.6 million, or 4.0%, to $1.560 billion at March 31, 2018, from $1.626 billion at December 31, 2017. The decrease in total assets was primarily due to decreases in cash and cash equivalents and loans. Cash and cash equivalents decreased $35.0 million, or 27.4%, to $92.6 million at March 31, 2018, from $127.6 million at December 31, 2017. Loans decreased $37.1 million, or 2.8%, to $1.278 billion at March 31, 2018, from $1.315 billion at December 31, 2017. Partially offsetting the decreases in cash and cash equivalents and loans was an increase in securities of $9.3 million, or 9.9%, to $102.7 million at March 31, 2018, from $93.4 million at December 31, 2017.

Our loan portfolio consists primarily of investment and business loans (multi-family, nonresidential real estate, commercial, construction and land loans, and commercial leases), which together totaled 92.7% of gross loans at March 31, 2018. Commercial loans increased by $10.0 million during the three months endedMarch 31, 2018. Multi-family mortgage loans, nonresidential real estate loans, and commercial leases each decreased during the three months endedMarch 31, 2018. Multi-family mortgage loans decreased $10.2 million, or 1.7%; nonresidential real estate loans decreased $6.1 million, or 3.6%; and commercial leases decreased $24.9 million, or 8.0%. Our primary lending area consists of the counties in the State of Illinois where our branch offices are located, and contiguous counties. We derive the most significant portion of our revenues from these geographic areas. We also

29

engage in multi-family mortgage lending activities in carefully selected metropolitan areas outside our primary lending area, and engage in certain types of commercial lending and leasing activities on a nationwide basis. At March 31, 2018, $268.6 million, or 46.5%, of our multi-family mortgage loans were in the Metropolitan Statistical Area for Chicago, Illinois; $72.8 million, or 12.6%, were in the Metropolitan Statistical Area for Dallas, Texas; $56.8 million, or 9.8%, were in the Metropolitan Statistical Area for Denver, Colorado; $33.3 million, or 5.8%, were in the Metropolitan Statistical Area for Tampa, Florida; and $17.1 million, or 3.0%, were in the Metropolitan Statistical Area for Minneapolis, Minnesota. This information reflects the location of the collateral, but does not necessarily reflect the location of the borrower.

Total liabilities decreased $66.3 million, or 4.6%, to $1.362 billion at March 31, 2018, from $1.428 billion at December 31, 2017, primarily due to decreases in deposits, due in part to planned non-renewals of maturing wholesale certificates of deposits. Total deposits decreased $62.0 million, or 4.6%, to $1.278 billion at March 31, 2018, from $1.340 billion at December 31, 2017. Certificates of deposit decreased $44.5 million, or 12.5%, to $311.4 million at March 31, 2018, from $356.0 million at December 31, 2017, primarily due to a $53.0 million decrease in wholesale certificates of deposit. Money market accounts decreased $9.0 million, or 3.0%, to $290.6 million at March 31, 2018, from $299.6 million at December 31, 2017. Interest-bearing NOW accounts decreased $6.3 million, or 2.2%, to $283.3 million at March 31, 2018, from $289.7 million at December 31, 2017. Noninterest-bearing demand deposits decreased $1.8 million, or 0.8%, to $232.6 million at March 31, 2018, from $234.4 million at December 31, 2017 and savings accounts decreased $408,000, or 0.3%, to $160.1 million at March 31, 2018, from $160.5 million at December 31, 2017. Core deposits (which consists of savings, money market, noninterest-bearing demand and NOW accounts) were 75.6% and 73.4% of total deposits at March 31, 2018 and December 31, 2017, respectively.

Total stockholders’ equity was $198.4 million at March 31, 2018, compared to $197.6 million at December 31, 2017. The increase in total stockholders’ equity was due to net income of $3.6 million that we recorded for the three months endedMarch 31, 2018, partially offset by our repurchase of 81,500 shares of our common stock during the three months ended2018 at a total cost of $1.3 million and our declaration and payment of cash dividends totaling $1.4 million during the same period.

Operating Results for the Three Months Ended March 31, 2018 and 2017

Net Income. Net income was $3.6 million for the three months endedMarch 31, 2018, compared to net income of $1.9 million for the three months endedMarch 31, 2017. Earnings per basic and fully diluted share of common stock was $0.20 for the three months endedMarch 31, 2018, compared to $0.10 for the three months endedMarch 31, 2017.

Net Interest Income. Net interest income was $13.0 million for the three months endedMarch 31, 2018, compared to $12.1 million for the three months endedMarch 31, 2017. The increase in net interest income reflected a $1.4 million, or 10.4%, increase in interest income, which was partially offset by a $451,000, or 35.3%, increase in interest expense.

The increase in interest income was primarily attributable to an increase in the average yield on interest-earning assets. The yield on interest-earning assets increased 39 basis points to 4.00% for the three months endedMarch 31, 2018, from 3.61% for the same period in 2017. The cost of interest-bearing liabilities increased 16 basis points to 0.62% for the three months endedMarch 31, 2018, from 0.46% for the same period in 2017. Total average interest-earning assets decreased $5.5 million, or 0.4%, to $1.497 billion for the three months endedMarch 31, 2018, from $1.502 billion for the same period in 2017. The average yield on commercial loans and leases originated in the first quarter of 2018 increased to 5.61%, from 5.12% for commercial loans and leases originated in the fourth quarter of 2017. Our net interest rate spread increased by 23 basis points to 3.38% for the three months endedMarch 31, 2018, from 3.15% for the same period in 2017. Our net interest margin increased by 27 basis points to 3.53% for the three months endedMarch 31, 2018, from 3.26% for the same period in 2017.

30

Average Balance Sheets

The following table sets forth average balance sheets, average yields and costs, and certain other information. No tax-equivalent yield adjustments were made, as the effect of these adjustments would not be material. Average balances are daily average balances. Nonaccrual loans are included in the computation of average balances, but have been reflected in the table as loans carrying a zero yield. The yields set forth below include the effect of deferred fees and expenses, discounts and premiums and purchase accounting adjustments that are amortized or accreted to interest income or expense.

	For the Three Months Ended March 31,
	2018							2017
	Average Outstanding Balance			Interest		Yield/Rate(1)		Average Outstanding Balance			Interest		Yield/Rate (1)
	(Dollars in thousands)
Interest-earning assets:
Loans	$	1,294,387		$	13,820	4.33	%	$	1,313,299		$	12,760	3.94	%
Securities	103,928			464		1.81		113,756			349		1.24
Stock in FHLB and FRB	8,289			105		5.14		9,158			99		4.38
Other	90,078			359		1.62		65,933			154		0.95
Total interest-earning assets	1,496,682			14,748		4.00		1,502,146			13,362		3.61
Noninterest-earning assets	85,151							93,045
Total assets	$	1,581,833						$	1,595,191
Interest-bearing liabilities:
Savings deposits	$	160,148		47		0.12		$	160,456		43		0.11
Money market accounts	294,504			379		0.52		307,121			273		0.36
NOW accounts	282,005			140		0.20		263,286			121		0.19
Certificates of deposit	333,978			959		1.16		352,929			743		0.85
Total deposits	1,070,635			1,525		0.58		1,083,792			1,180		0.44
Borrowings	60,737			202		1.35		49,306			96		0.79
Total interest-bearing liabilities	1,131,372			1,727		0.62		1,133,098			1,276		0.46
Noninterest-bearing deposits	226,936							235,167
Noninterest-bearing liabilities	23,853							21,547
Total liabilities	1,382,161							1,389,812
Equity	199,672							205,379
Total liabilities and equity	$	1,581,833						$	1,595,191
Net interest income				$	13,021						$	12,086
Net interest rate spread (2)						3.38	%						3.15	%
Net interest-earning assets (3)	$	365,310						$	369,048
Net interest margin (4)						3.53	%						3.26	%
Ratio of interest-earning assets to interest-bearing liabilities	132.29		%					132.57		%

(1) Annualized.

(2) Net interest rate spread represents the difference between the yield on average interest-earning assets and the cost of average interest-bearing liabilities.

(3) Net interest-earning assets represents total interest-earning assets less total interest-bearing liabilities.

(4) Net interest margin represents net interest income divided by average total interest-earning assets.

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Provision for Loan Losses

We establish provisions for loan losses, which are charged to operations in order to maintain the allowance for loan losses at a level we consider necessary to absorb probable incurred credit losses in the loan portfolio. In determining the level of the allowance for loan losses, we consider past and current loss experience, evaluations of real estate collateral, current economic conditions, volume and type of lending, adverse situations that may affect a borrower’s ability to repay a loan and the levels of nonperforming and other classified loans. The amount of the allowance is based on estimates and the ultimate losses may vary from such estimates as more information becomes available or events change. We assess the allowance for loan losses on a quarterly basis and make provisions for loan losses in order to maintain the allowance.

A loan balance is classified as a loss and charged-off when it is confirmed that there is no readily apparent source of repayment for the portion of the loan that is classified as loss. Confirmation can occur upon the receipt of updated third-party appraisal valuation information indicating that there is a low probability of repayment upon sale of the collateral, the final disposition of collateral where the net proceeds are insufficient to pay the loan balance in full, our failure to obtain possession of certain consumer-loan collateral within certain time limits specified by applicable federal regulations, the conclusion of legal proceedings where the borrower’s obligation to repay is legally discharged (such as a Chapter 7 bankruptcy proceeding), or when it appears that further formal collection procedures are not likely to result in net proceeds in excess of the costs to collect.

We recorded a recovery of loan losses of $258,000 for the three months ended March 31, 2018, compared to a provision for loan losses of $161,000 for the same period in 2017. The provision for or recovery of loan losses is a function of the allowance for loan loss methodology that we use to determine the appropriate level of the allowance for inherent loan losses after net charge-offs have been deducted. The portion of the allowance for loan losses attributable to loans collectively evaluated for impairment decreased $25,000, or 0.3%, to $8.3 million at March 31, 2018, from $8.4 million at December 31, 2017.There was no reserve established for loans individually evaluated for impairment for the three months ended March 31, 2018 or for the three months ended December 31, 2017. Net recoveries were $233,000 for the three months ended March 31, 2018.

The allowance for loan losses as a percentage of nonperforming loans was 426.00% at March 31, 2018, compared to 350.04% at December 31, 2017.

Noninterest Income

	Three Months Ended March 31,
	2018		2017		Change
	(Dollars in thousands)
Deposit service charges and fees	$	978	$	950	$	28
Loan fee income	70		60		10
Commercial mortgage brokerage fees	41		—		41
Residential mortgage banking fees	30		44		(14		)
Trust and insurance commissions and annuities income	213		249		(36		)
Earnings on bank owned life insurance	66		63		3
Other	141		178		(37		)
Total noninterest income	$	1,539	$	1,544	$	(5	)

Noninterest income was $1.5 million for each of the three month periods ended March 31, 2018 and 2017. Deposit service charges and fees increased $28,000, or 2.9% to $978,000 for the three months ended March 31, 2018, compared to $950,000 for the three months ended March 31, 2017. We recorded $41,000 in commercial mortgage brokerage fees associated with commercial loans placed with other institutions for the three months ended March 31, 2018, while residential mortgage banking fees decreased $14,000 to $30,000 for the three months ended March 31, 2018. The majority of the loans the Company originates are commercial-related loans, such as multi-family, nonresidential real estate, commercial, construction and land loans, and commercial leases. The Company no longer originates one-to-four family residential mortgage loans. Trust and insurance commissions and annuities income declined by $36,000, or 14.5%, to $213,000 for the three months ended March 31, 2018, due to lower sales of annuity products and property and casualty insurance, related in part to the consolidation of our Wealth Management Department into our Trust Department. Other income decreased $37,000, or 20.8%, to $141,000 for the three months ended March 31, 2018, compared to $178,000 for the three months ended March 31, 2017.

32

Noninterest Expense

	Three Months Ended March 31,
	2018		2017		Change
	(Dollars in thousands)
Compensation and benefits	$	5,322	$	6,352	$	(1,030	)
Office occupancy and equipment	1,731		1,622		109
Advertising and public relations	143		381		(238		)
Information technology	641		753		(112		)
Supplies, telephone and postage	333		332		1
Amortization of intangibles	122		129		(7		)
Nonperforming asset management	202		104		98
Loss on sale other real estate owned	21		16		5
Valuation adjustments of other real estate owned	25		20		5
Operations of other real estate owned	115		177		(62		)
FDIC insurance premiums	119		187		(68		)
Other	1,185		1,193		(8		)
Total noninterest expense	$	9,959	$	11,266	$	(1,307	)

Noninterest expense decreased by $1.3 million, or 11.6%, to $10.0 million for the three months ended March 31, 2018, from $11.3 million for the same period in 2017. Compensation and benefits expense decreased $1.0 million, primarily due to our recording of a one-time, non-cash, non-tax deductible equity compensation expense of $1.1 million in 2017 related to the termination of the ESOP and the repayment of the ESOP’s Share Acquisition Loan. Office occupancy and equipment expense increased $109,000, or 6.7%, to $1.7 million for the three months ended March 31, 2018, from $1.6 million for the same period in 2017, primarily due to $122,000 increase in snow removal expense. Advertising and public relations expense decreased $238,000, or 62.5%, to $143,000 for the three months ended March 31, 2018, from $381,000 for the same period in 2017. Our advertising and public relations expense for the three months ended March 31, 2017 included $251,000 of expense for direct mail marketing, website, outdoor advertising and magazine/newspaper print advertising, compared to $39,400 for the three months ended March 31, 2018. Information technology expense decreased $112,000, or 14.9%, to $641,000 for the three months ended March 31, 2018, from $753,000 for the same period in 2017. Nonperforming asset management expense increased $98,000, or 94.2%, to $202,000 for the three months ended March 31, 2018, from $104,000 for the same period in 2017, primarily due to an increase of $90,000 in legal expense related to collection activities. Valuation adjustments for OREO totaled $25,000 for the three months ended March 31, 2018, compared to $20,000 for the same period in 2017. Operations of OREO decreased $62,000, or 35.0%, to $115,000 for the three months ended March 31, 2018, primarily due to decreased real estate taxes and increased rental income.

Income Taxes

For the three months ended March 31, 2018, we recorded income tax expense of $1.3 million, due to an increase in pre-tax income compared to $322,000 for the three months ended March 31, 2017. Our combined state and federal effective tax rate for the three months ended March 31, 2018 was 26.8% versus a normalized effective tax rate of 38.8% for fourth quarter of 2017 before the enactment of the Tax Cuts and Jobs Act of 2017.

.

33

Nonperforming Loans and Assets

We review loans on a regular basis, and generally place loans on nonaccrual status when either principal or interest is 90 days or more past due. In addition, we place loans on nonaccrual status when we do not expect to receive full payment of interest or principal. Interest accrued and unpaid at the time a loan is placed on nonaccrual status is reversed from interest income. Interest payments received on nonaccrual loans are recognized in accordance with our significant accounting policies. Once a loan is placed on nonaccrual status, the borrower must generally demonstrate at least six consecutive months of contractual payment performance before the loan is eligible to return to accrual status. We may have loans classified as 90 days or more delinquent and still accruing. Generally, we do not utilize this category of loan classification unless: (1) the loan is repaid in full shortly after the period end date; (2) the loan is well secured and there are no asserted or pending legal barriers to its collection; or (3) the borrower has remitted all scheduled payments and is otherwise in substantial compliance with the terms of the loan, but the processing of loan payments actually received or the renewal of the loan has not occurred for administrative reasons. At March 31, 2018, we had no loans in this category.

We typically obtain new third–party appraisals or collateral valuations when we place a loan on nonaccrual status, conduct impairment testing or conduct a TDR analysis unless the existing valuation information for the collateral is sufficiently current to comply with the requirements of our Appraisal and Collateral Valuation Policy (“ACV Policy”). We also obtain new third–party appraisals or collateral valuations when the judicial foreclosure process concludes with respect to real estate collateral, and when we otherwise acquire actual or constructive title to real estate collateral. In addition to third–party appraisals, we use updated valuation information based on Multiple Listing Service data, broker opinions of value, actual sales prices of similar assets sold by us and approved sales prices in response to offers to purchase similar assets owned by us to provide interim valuation information for consolidated financial statement and management purposes. Our ACV Policy establishes the maximum useful life of a real estate appraisal at 18 months. Because appraisals and updated valuations utilize historical or “ask–side” data in reaching valuation conclusions, the appraised or updated valuation may or may not reflect the actual sales price that we will receive at the time of sale.

Real estate appraisals may include up to three approaches to value: the sales comparison approach, the income approach (for income-producing property) and the cost approach. Not all appraisals utilize all three approaches. Depending on the nature of the collateral and market conditions, we may emphasize one approach over another in determining the fair value of real estate collateral. Appraisals may also contain different estimates of value based on the level of occupancy or planned future improvements. “As-is” valuations represent an estimate of value based on current market conditions with no changes to the use or condition of the real estate collateral. “As-stabilized” or “as-completed” valuations assume the real estate collateral will be improved to a stated standard or achieve its highest and best use in terms of occupancy. “As-stabilized” or “as-completed” valuations may be subject to a present value adjustment for market conditions or the schedule of improvements.

As part of the asset classification process, we develop an exit strategy for real estate collateral or OREO by assessing overall market conditions, the current use and condition of the asset, and its highest and best use. For most income–producing real estate, we believe that investors value most highly a stable income stream from the asset; consequently, we perform a comparative evaluation to determine whether conducting a sale on an “as–is”, “as–stabilized” or “as–completed” basis is most likely to produce the highest net realizable value. If we determine that the “as–stabilized” or “as–completed” basis is appropriate, we then complete the necessary improvements or tenant stabilization tasks, with the applicable time value discount and improvement expenses incorporated into our estimates of the expected costs to sell. As of March 31, 2018, substantially all impaired real estate loan collateral and OREO were valued on an “as–is basis.”

Estimates of the net realizable value of real estate collateral also include a deduction for the expected costs to sell the collateral or such other deductions from the cash flows resulting from the operation and liquidation of the asset as are appropriate. For most real estate collateral subject to the judicial foreclosure process, we generally apply a 10.0% deduction to the value of the asset to determine the expected costs to sell the asset. This estimate includes one year of real estate taxes, sales commissions and miscellaneous repair and closing costs. If we receive a purchase offer that requires unbudgeted repairs, or if the expected resolution period for the asset exceeds one year, we then include, on a case-by-case basis, the costs of the additional real estate taxes and repairs and any other material holding costs in the expected costs to sell the collateral. For OREO, we generally apply a 7.0% deduction to determine the expected costs to sell, as expenses for real estate taxes and repairs are expensed when incurred.

34

Nonperforming Assets Summary

The following table below sets forth the amounts and categories of our nonperforming loans and nonperforming assets.

	March 31, 2018			December 31, 2017			Quarter Change
	(Dollars in thousands)
Nonaccrual loans:
One-to-four family residential real estate	$	1,589		$	2,027		$	(438	)
Multi-family mortgage	369			363			6
	1,958			2,390			(432		)
Other real estate owned:
One-to-four family residential	935			827			108
Nonresidential real estate	863			1,520			(657		)
Land	4			4			—
	1,802			2,351			(549		)
Total nonperforming assets	$	3,760		$	4,741		$	(981	)
Ratios:
Nonperforming loans to total loans	0.15		%	0.18		%
Nonperforming assets to total assets	0.24			0.29

Nonperforming Assets

Nonperforming assets decreased $1.0 million to $3.8 million at March 31, 2018 from $4.7 million at December 31, 2017. Although we experience occasional isolated instances of new nonaccrual loans, we believe that we will maintain the trends favoring strong asset quality.

Two residential loans with an aggregate book balance of $562,000 were transferred from nonaccrual loans to OREO during the three months endedMarch 31, 2018. We continue to experience modest quantities of defaults on residential real estate loans principally due either to the borrower’s personal financial condition or deteriorated collateral value.

Liquidity and Capital Resources

Liquidity. The overall objective of our liquidity management is to ensure the availability of sufficient cash funds to meet all financial commitments and to take advantage of investment opportunities. We manage liquidity in order to meet deposit withdrawals on demand or at contractual maturity, to repay borrowings as they mature, and to fund new loans and investments as opportunities arise.

Our primary sources of funds are deposits, principal and interest payments on loans and securities, and, to a lesser extent, wholesale borrowings, the proceeds from maturing securities and short-term investments, and the proceeds from the sales of loans and securities and lease payments. The scheduled amortization of loans and securities, as well as proceeds from borrowings, are predictable sources of funds. Other funding sources, however, such as deposit inflows, mortgage prepayments and mortgage loan sales are greatly influenced by market interest rates, economic conditions and competition. We anticipate that we will have sufficient funds available to meet current loan commitments and lines of credit and maturing certificates of deposit that are not renewed or extended. We generally remain fully invested and utilize FHLB advances as an additional sources of funds. We had $60.0 million of FHLB advances at March 31, 2018 and December 31, 2017.

BankFinancial Corporation is a separate legal entity from BankFinancial NA. The Company must provide for its own liquidity to pay any dividends to its shareholders and to repurchase shares of its common stock, and for other corporate purposes. Its primary source of liquidly is dividend payments it receives from the Bank. The Bank's ability to pay dividends to the Company is subject to regulatory limitations. At March 31, 2018, the Company (on an unconsolidated, stand-alone basis) has liquid assets of $6.4 million.

As of March 31, 2018, we were not aware of any known trends, events or uncertainties that had or were reasonably likely to have a material impact on our liquidity. As of March 31, 2018, we had no other material commitments for capital expenditures.

35

Capital Management - Bank. The overall objectives of our capital management are to ensure the availability of sufficient capital to support loan, deposit and other asset and liability growth opportunities and to maintain sufficient capital to absorb unforeseen losses or write-downs that are inherent in the business risks associated with the banking industry. We seek to balance the need for higher capital levels to address such unforeseen risks and the goal to achieve an adequate return on the capital invested by our stockholders.

The Bank and the Company are subject to regulatory capital requirements administered by the federal banking agencies. The capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve the quantitative measurement of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. The failure to meet minimum capital requirements can result in regulatory actions. The final rules implementing Basel Committee on Banking Supervision's capital guidelines for U.S. banks (Basel III rules) became effective for the Company on January 1, 2015, with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. The net unrealized gain or loss on available for sale securities is not included in computing regulatory capital.

Prompt corrective action regulations provide five classifications: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If only adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. As of March 31, 2018 and December 31, 2017, the OCC categorized the Bank as well–capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since those notifications that management believes have changed the institution’s well–capitalized status.

The minimum capital ratios set forth in the Regulatory Capital Plans will be increased or decreased and other minimum capital requirements will be established if and as necessary. In accordance with the Regulatory Capital Plans, neither the Company nor the Bank will pursue any acquisition or growth opportunity, declare any dividend or conduct any stock repurchase that would cause the Bank's total risk-based capital ratio and/or its Tier 1 leverage ratio to fall below the established minimum capital levels or the capital levels required for capital adequacy plus the Capital Conservation Buffer ("CCB"). The minimum CCB at March 31, 2018 is 1.875% and will increase 0.625% through 2019 to 2.5%. In addition, the Company intends to continue to maintain its ability to serve as a source of financial strength to the Bank by holding at least $5.0 million of cash or liquid assets for that purpose. As of March 31, 2018, the Bank and the Company were well-capitalized, with all capital ratios exceeding the well-capitalized requirement. There are no conditions or events that management believes have changed the Bank’s prompt corrective action capitalization category.

The Bank is subject to regulatory restrictions on the amount of dividends it may declare and pay to the Company without prior regulatory approval, and to regulatory notification requirements for dividends that do not require prior regulatory approval.

36

Actual and required capital amounts and ratios were:

	Actual				Required for Capital Adequacy Purposes				To be Well-Capitalized under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in thousands)
March 31, 2018
Total capital (to risk-weighted assets):
Consolidated	$	197,493	17.72	%	$	89,139	8.00	%	N/A		N/A
BankFinancial, NA	190,805		17.13		89,115		8.00		$	111,394	10.00	%
Tier 1 (core) capital (to risk-weighted assets):
Consolidated	189,152		16.98		66,854		6.00		N/A		N/A
BankFinancial, NA	182,464		16.38		66,836		6.00		89,115		8.00
Common Tier 1 (CET1)
Consolidated	189,152		16.98		50,141		4.50		N/A		N/A
BankFinancial, NA	182,464		16.38		50,127		4.50		72,406		6.50
Tier 1 (core) capital (to adjusted average total assets):
Consolidated	189,152		12.03		62,918		4.00		N/A		N/A
BankFinancial, NA	182,464		11.60		62,911		4.00		78,639		5.00

December 31, 2017
Total capital (to risk-weighted assets):
Consolidated	$	195,371	17.06	%	$	91,590	8.00	%	N/A		N/A
BankFinancial, NA	188,582		16.48		91,572		8.00		$	114,466	10.00	%
Tier 1 (core) capital (to risk-weighted assets):
Consolidated	187,005		16.33		68,692		6.00		N/A		N/A
BankFinancial, NA	180,216		15.74		68,679		6.00		91,572		8.00
Common Tier 1 (CET1)
Consolidated	187,005		16.33		51,519		4.50		N/A		N/A
BankFinancial, NA	180,216		15.74		51,509		4.50		74,403		6.50
Tier 1 (core) capital (to adjusted average total assets):
Consolidated	187,005		11.49		65,085		4.00		N/A		N/A
BankFinancial, NA	180,216		11.08		65,045		4.00		81,307		5.00

Capital Management - Company. Total stockholders’ equity was $198.4 million at March 31, 2018, compared to $197.6 million at December 31, 2017. The increase in total stockholders’ equity was due to net income of $3.6 million that we recorded for the three months endedMarch 31, 2018, partially offset by our repurchase of 81,500 shares of our common stock during the three months ended2018 at a total cost of $1.3 million and our declaration and payment of cash dividends totaling $1.4 million during the same period.

Quarterly Cash Dividends. The Company declared cash dividends of $0.08 and $0.06 per share for the three months endedMarch 31, 2018 and March 31, 2017, respectively.

Stock Repurchase Program. During the quarter ended March 31, 2018, the Company repurchased 81,500 shares of its common stock. On March 28, 2018, the Board extended the expiration date of the Company's share repurchase authorization from June 30, 2018 to April 30, 2019, and increased the total number of shares authorized for repurchase by 500,000 shares. As of March 31, 2018, the Company had repurchased 2,669,279 shares of its common stock out of the 3,330,755 shares of common stock authorized under the share repurchase authorizations. Pursuant to the share repurchase authorization, there are 661,476 shares of common stock authorized for repurchase through April 30, 2019.

37

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

Qualitative Analysis. A significant form of market risk is interest rate risk. Interest rate risk results from timing differences in the maturity or repricing of our assets, liabilities and off balance sheet contracts (i.e., forward loan commitments), the effect of loan prepayments and deposit withdrawals, the difference in the behavior of lending and funding rates arising from the use of different indices and “yield curve risk” arising from changing rate relationships across the spectrum of maturities for constant or variable credit risk investments. In addition to directly affecting net interest income, changes in market interest rates can also affect the amount of new loan originations, the ability of borrowers to repay variable rate loans, the volume of loan prepayments and refinancings, the carrying value of investment securities classified as available-for-sale and the flow and mix of deposits.

The general objective of our interest rate risk management is to determine the appropriate level of risk given our business strategy and then manage that risk in a manner that is consistent with our policy to reduce, to the extent possible, the exposure of our net interest income to changes in market interest rates. Our Asset/Liability Management Committee (“ALCO”), which consists of certain members of senior management, evaluates the interest rate risk inherent in certain assets and liabilities, our operating environment and capital and liquidity requirements, and modifies our lending, investing and deposit gathering strategies accordingly. The Board of Directors then reviews the ALCO’s activities and strategies, the effect of those strategies on our net interest margin, and the effect that changes in market interest rates would have on the economic value of our loan and securities portfolios as well as the intrinsic value of our deposits and borrowings, and reports to the full Board of Directors.

We actively evaluate interest rate risk in connection with our lending, investing and deposit activities. In an effort to better manage interest-rate risk, we have de-emphasized the origination of residential mortgage loans, and have increased our emphasis on the origination of nonresidential real estate loans, multi-family mortgage loans, commercial loans and commercial leases. In addition, depending on market interest rates and our capital and liquidity position, we generally sell all or a portion of our longer-term, fixed-rate residential loans, usually on a servicing-retained basis. Further, we primarily invest in shorter-duration securities, which generally have lower yields compared to longer-term investments. Shortening the average maturity of our interest-earning assets by increasing our investments in shorter-term loans and securities, as well as loans with variable rates of interest, helps to better match the maturities and interest rates of our assets and liabilities, thereby reducing the exposure of our net interest income to changes in market interest rates. Finally, we have classified all of our investment portfolio as available-for-sale so as to provide flexibility in liquidity management.

We utilize a combination of analyses to monitor the Bank’s exposure to changes in interest rates. The economic value of equity analysis is a model that estimates the change in net portfolio value (“NPV”) over a range of interest rate scenarios. NPV is the discounted present value of expected cash flows from assets, liabilities and off-balance sheet contracts. In calculating changes in NPV, we assume estimated loan prepayment rates, reinvestment rates and deposit decay rates that seem most likely based on historical experience during prior interest rate changes.

Our net interest income analysis utilizes the data derived from the dynamic GAP analysis, described below, and applies several additional elements, including actual interest rate indices and margins, contractual limitations such as interest rate floors and caps and the U.S. Treasury yield curve as of the balance sheet date. In addition, we apply consistent parallel yield curve shifts (in both directions) to determine possible changes in net interest income if the theoretical yield curve shifts occurred instantaneously. Net interest income analysis also adjusts the dynamic GAP repricing analysis based on changes in prepayment rates resulting from the parallel yield curve shifts.

Our dynamic GAP analysis determines the relative balance between the repricing of assets and liabilities over multiple periods of time (ranging from overnight to five years). Dynamic GAP analysis includes expected cash flows from loans and mortgage-backed securities, applying prepayment rates based on the differential between the current interest rate and the market interest rate for each loan and security type. This analysis identifies mismatches in the timing of asset and liability repricing but does not necessarily provide an accurate indicator of interest rate risk because it omits the factors incorporated into the net interest income analysis.

38

Quantitative Analysis. The following table sets forth, as of March 31, 2018, the estimated changes in the Bank’s NPV and net interest income that would result from the designated instantaneous parallel shift in the U.S. Treasury yield curve. Computations of prospective effects of hypothetical interest rate changes are based on numerous assumptions including relative levels of market interest rates, loan prepayments and deposit decay, and should not be relied upon as indicative of actual results.

	Estimated Decrease in NPV					Increase (Decrease) in Estimated Net Interest Income
Change in Interest Rates (basis points)	Amount			Percent		Amount			Percent
	(Dollars in thousands)
+400	$	(40,663	)	(14.98	)%	$	(999	)	(1.91	)%
+300	(26,165		)	(9.64	)	(608		)	(1.16	)
+200	(14,758		)	(5.44	)	(270		)	(0.52	)
+100	(5,669		)	(2.09	)	21			0.04
0
-100	(16,356		)	(6.02	)	(3,454		)	(6.60	)

The table set forth above indicates that at March 31, 2018, in the event of an immediate 100 basis point decrease in interest rates, the Bank would be expected to experience a 6.02% decrease in NPV and a $3.5 million decrease in net interest income. In the event of an immediate 200 basis point increase in interest rates, the Bank would be expected to experience a 5.44% decrease in NPV and a $270,000 decrease in net interest income. This data does not reflect any actions that we may undertake in response to changes in interest rates, such as changes in rates paid on certain deposit accounts based on local competitive factors, which could reduce the actual impact on NPV and net interest income, if any.

Certain shortcomings are inherent in the methodology used in the above interest rate risk measurements. Modeling changes in NPV and net interest income requires that we make certain assumptions that may or may not reflect the manner in which actual yields and costs respond to changes in market interest rates. The NPV and net interest income table presented above assumes that the composition of our interest-rate-sensitive assets and liabilities existing at the beginning of a period remains constant over the period being measured and, accordingly, the data does not reflect any actions that we may undertake in response to changes in interest rates, such as changes in rates paid on certain deposit accounts based on local competitive factors. The table also assumes that a particular change in interest rates is reflected uniformly across the yield curve regardless of the duration to maturity or the repricing characteristics of specific assets and liabilities. Because of the shortcomings mentioned above, management considers many additional factors such as projected changes in loan and deposit balances and various projected forward interest rate scenarios when evaluating strategies for managing interest rate risk. Accordingly, although the NPV and net interest income table provides an indication of our sensitivity to interest rate changes at a particular point in time, such measurements are not intended to and do not provide a precise forecast of the effect of changes in market interest rates on our net interest income and will differ from actual results.

ITEM 4. CONTROLS AND PROCEDURES

An evaluation was performed under the supervision and with the participation of the Company’s management, including the Chairman, Chief Executive Officer and President and the Executive Vice President and Chief Financial Officer, of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) promulgated under the Securities and Exchange Act of 1934, as amended) as of March 31, 2018. Based on that evaluation, the Company’s management, including the Chairman, Chief Executive Officer, and President and the Executive Vice President and Chief Financial Officer, concluded that the Company’s disclosure controls and procedures were effective.

During the quarter ended March 31, 2018, there have been no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

39

PART II

ITEM 1. LEGAL PROCEEDINGS

The Company and its subsidiaries are subject to various legal actions arising in the normal course of business. In the opinion of management, based on currently available information, the resolution of these legal actions is not expected to have a material adverse effect on the Company’s results of operations.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors previously disclosed in the Company's filings with the Securities and Exchange Commission.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) Unregistered Sale of Equity Securities. Not applicable.

(b) Use of Proceeds. Not applicable.

(c) Repurchases of Equity Securities.

The following table sets forth information in connection with purchases of our common stock made by, or, on behalf of us, during the first quarter of 2018:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet be Purchased under the Plans or Programs (1)
January 1, 2018 through January 31, 2018	—	$	—	—	242,976
February 1, 2018 through February 28, 2018	39,500	15.81		39,500	203,476
March 1, 2018 through March 31, 2018	42,000	16.52		42,000	661,476
	81,500			81,500

⁽¹⁾  On March 28, 2018, the Board extended the expiration date of the Company's share repurchase authorization from June 30, 2018 to April 30, 2019, and increased the total number of shares authorized for repurchase by 500,000 shares. As of March 31, 2018, the Company had repurchased 2,669,279 shares of its common stock out of the 3,330,755 shares of common stock authorized under the share repurchase authorizations. Pursuant to the share repurchase authorization, there are 661,476 shares of common stock authorized for repurchase through April 30, 2019.

DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 3. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 4. OTHER INFORMATION

None.

ITEM 5. EXHIBITS

40

Exhibit Number	Description
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002*
101	The following financial statements from the BankFinancial Corporation Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, formatted in Extensive Business Reporting Language (XBRL): (i) consolidated statement of conditions, (ii) consolidated statements of operations, (iii) consolidated statements of cash flows and (iv) the notes to consolidated financial statements.

* A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

41

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		BANKFINANCIAL CORPORATION
Dated:	April 30, 2018	By:	/s/ F. Morgan Gasior
			F. Morgan Gasior
			Chairman of the Board, Chief Executive Officer and President
			/s/ Paul A. Cloutier
			Paul A. Cloutier
			Executive Vice President and Chief Financial Officer

42

EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, F. Morgan Gasior, certify that:

1) I have reviewed this quarterly report on Form 10-Q of BankFinancial Corporation;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated:	April 30, 2018	By:	/s/ F. Morgan Gasior
			F. Morgan Gasior
			Chairman of the Board, Chief Executive Officer and President

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Paul A. Cloutier, certify that:

1) I have reviewed this quarterly report on Form 10-Q of BankFinancial Corporation;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated:	April 30, 2018	By:	/s/ Paul A. Cloutier
			Paul A. Cloutier
			Executive Vice President and Chief Financial Officer

EX-32

Exhibit 32

Certification of Chief Executive Officer and Chief Financial Officer

Pursuant to Section 906 of the Sarbanes- Oxley Act of 2002

F. Morgan Gasior, Chairman of the Board, Chief Executive Officer and President of BankFinancial Corporation, a Maryland corporation (the “Company”) and Paul A. Cloutier, Executive Vice President and Chief Financial Officer of the Company, each certify in his capacity as an officer of the Company that he has reviewed the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 (the “Report”) and that to the best of his knowledge:

1. the Report fully complies with the requirements of Sections 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

		BANKFINANCIAL CORPORATION
Dated:	April 30, 2018	By:	/s/ F. Morgan Gasior
			F. Morgan Gasior
			Chairman of the Board and Chief Executive Officer
			/s/ Paul A. Cloutier
			Paul A. Cloutier
			Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018
Entity Registrant Name	BankFinancial CORP
Entity Central Index Key	0001303942
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,739,054
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

XML

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from other financial institutions	$ 10,613	$ 13,572
Interest-bearing deposits in other financial institutions	81,963	114,020
Cash and cash equivalents	92,576	127,592
Securities, at fair value		93,383
Loans receivable, net of allowance for loan losses: March 31, 2018, $8,341 and December 31, 2017, $8,366	1,277,553	1,314,651
Other real estate owned, net	1,802	2,351
Stock in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB), at cost	8,290	8,290
Premises held-for-sale	5,581	5,667
Premises and equipment, net	24,628	24,856
Accrued interest receivable	4,900	4,619
Core deposit intangible	164	286
Bank owned life insurance	22,925	22,859
Deferred taxes	11,363	12,563
Other assets	7,486	8,441
Total assets	1,559,929	1,625,558
Deposits
Noninterest-bearing	232,593	234,354
Interest-bearing	1,045,414	1,105,697
Total deposits	1,278,007	1,340,051
Borrowings	60,983	60,768
Advance payments by borrowers for taxes and insurance	9,558	11,645
Accrued interest payable and other liabilities	13,029	15,460
Total liabilities	1,361,577	1,427,924
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; 17,877,223 shares issued at March 31, 2018 and 17,958,723 issued at December 31, 2017	178	179
Additional paid-in capital	152,489	153,811
Retained earnings	45,397	43,274
Accumulated other comprehensive income	288	370
Total stockholders’ equity	198,352	197,634
Total liabilities and stockholders’ equity	$ 1,559,929	$ 1,625,558

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Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 8,341	$ 8,366
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	17,877,223	17,958,723

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Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income
Loans, including fees	$ 13,820	$ 12,760
Securities	464	349
Other	464	253
Total interest income	14,748	13,362
Interest expense
Deposits	1,525	1,180
Borrowings	202	96
Borrowings	1,727	1,276
Net interest income	13,021	12,086
Provision for (recovery of) loan losses	(258)	161
Net interest income after provision for (recovery of) loan losses	13,279	11,925
Noninterest income
Deposit service charges and fees	978	950
Loan fee income	70	60
Commercial mortgage brokerage fees	41	0
Residential mortgage banking fees	30	44
Trust and insurance commissions and annuities income	213	249
Earnings on bank owned life insurance	66	63
Other	141	178
Total noninterest income	1,539	1,544
Noninterest expense
Compensation and benefits	5,322	6,352
Office occupancy and equipment	1,731	1,622
Advertising and public relations	143	381
Information technology	641	753
Supplies, telephone, and postage	333	332
Amortization of intangibles	122	129
Nonperforming asset management	202	104
Operations of other real estate owned	161	213
FDIC insurance premiums	119	187
Other	1,185	1,193
Total noninterest expense	9,959	11,266
Income before income taxes	4,859	2,203
Income tax expense	1,300	322
Net income	$ 3,559	$ 1,881
Basic earnings per common share (usd per share)	$ 0.20	$ 0.10
Diluted earnings per common share (usd per share)	$ 0.20	$ 0.10
Weighted average common shares outstanding (shares)	17,930,639	18,642,054
Diluted weighted average common shares outstanding (shares)	17,931,100	18,647,516

XML

Consolidated Statements Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 3,559	$ 1,881
Unrealized holding loss arising during the period	104	20
Tax effect	22	7
Net of tax	(82)	(13)
Comprehensive income	$ 3,477	$ 1,868

XML

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Unearned Employee Stock Ownership Plan Shares	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2016	$ 204,780	$ 192	$ 173,047	$ 39,483	$ (8,318)	$ 376
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,881			1,881
Other comprehensive loss, net of tax	(13)					(13)
Net exercise of stock options (192,215 shares)	(1,218)	2	(1,220)
Prepayment of ESOP Share Acquisition Loan	1,125	(8)	(7,185)		8,318
Repurchase and retirement of common stock (81,500 and 232,045 shares for quarters ended March 31, 2017 and 2016, respectively)	(3,379)	(2)	(3,377)
Cash dividends declared on common stock ($0.08 and $0.06 per share for quarters ended March 31, 2017 and 2016, respectively)	(1,155)			(1,155)
Ending Balance at Mar. 31, 2017	202,021	184	161,265	40,209	0	363
Beginning Balance at Dec. 31, 2017	197,634	179	153,811	43,274	0	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 (81,500 and 232,045 shares for quarters ended March 31, 2017 and 2016, respectively)	(1,323)	(1)	(1,322)
Cash dividends declared on common stock ($0.08 and $0.06 per share for quarters ended March 31, 2017 and 2016, respectively)	(1,436)			(1,436)
Ending Balance at Mar. 31, 2018	$ 198,352	$ 178	$ 152,489	$ 45,397	$ 0	$ 288

XML

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock (in dollars per share)	$ 0.08	$ 0.06
Repurchase and retirement of common stock (in shares)	81,500	232,045,000

XML

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 3,559	$ 1,881
Adjustments to reconcile to net income to net cash from operating activities
Provision for (recovery of) loan losses	(258)	161
Prepayment of ESOP Share Acquisition Loan	0	1,125
Depreciation and amortization	916	958
Amortization of premiums and discounts on securities and loans	3	(65)
Amortization of core deposit intangible	122	129
Amortization of servicing assets	27	31
Net change in net deferred loan origination costs	36	129
Loss on sale of other real estate owned	21	16
Net gain on sale of loans	0	(7)
Loans originated for sale	0	(239)
Proceeds from sale of loans	0	246
Other real estate owned valuation adjustments	25	20
Net change in:
Accrued interest receivable	(281)	(97)
Earnings on bank owned life insurance	(66)	(63)
Other assets	2,037	1,834
Accrued interest payable and other liabilities	(2,431)	(2,701)
Net cash from operating activities	3,710	3,358
Securities
Proceeds from maturities	27,499	13,623
Proceeds from principal repayments	1,030	637
Purchases of securities	(37,923)	(17,302)
Loans receivable
Loan participations sold	0	1,615
Principal payments on loans receivable	226,439	136,090
Purchase of loans	0	(20,406)
Originated for investment	(189,659)	(125,813)
Proceeds of redemption of FHLB stock	0	3,514
Purchase of FHLB and FRB stock	0	11
Proceeds from sale of other real estate owned	713	494
Purchase of premises and equipment, net	(150)	(179)
Net cash from (used in) investing activities	27,949	(7,738)
Cash flows from financing activities
Net change in deposits	(62,044)	(10,108)
Net change in borrowings	215	977
Net change in advance payments by borrowers for taxes and insurance	(2,087)	(1,973)
Payments for Repurchase of Common Stock	(1,323)	(3,379)
Payments of Ordinary Dividends, Common Stock	(1,436)	(1,155)
Payments for Deposits Applied to Debt Retirements	0	1,200
Net cash used in financing activities	(66,675)	(16,838)
Net change in cash and cash equivalents	(35,016)	(21,218)
Beginning cash and cash equivalents	127,592	96,684
Ending cash and cash equivalents	92,576	75,466
Supplemental disclosures of cash flow information:
Interest paid	1,694	1,243
Income taxes paid	43	1
Loans transferred to other real estate owned	$ 562	$ 1,936

XML

Summary of Significant Accounting Policies (Notes)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation: BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, 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, 2018 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2018 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.

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, 2017, as filed with the Securities and Exchange Commission.

Recent Accounti

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Earnings Per Share (Notes)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

ngs per share reflect earnings available to common stockholders for the period divided by the weighted average number of shares of common stock outstanding during the period, exclusive of unearned BankFinancial, NA Employee Stock Ownership Plan (the "ESOP") shares in 2017 and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock.

	Three Months Ended March 31,
	2018			2017
Net income available to common stockholders	$	3,559		$	1,881
Average common shares outstanding	17,931,579			19,243,941
Less:
Unearned ESOP shares	—			(600,947		)
Unvested restricted stock shares	(940		)	(940		)
Weighted average common shares outstanding	17,930,639			18,642,054
Add - Net effect of dilutive unvested restricted stock	461			5,462
Diluted weighted average common shares outstanding	17,931,100			18,647,516
Basic earnings per common share	$	0.20		$	0.10
Diluted earnings per common share	$	0.20		$	0.10

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Securities (Notes)

3 Months Ended

Mar. 31, 2018

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
March 31, 2018
Certificates of deposit	$	86,340	$	—	$	—		$	86,340
Mortgage-backed securities - residential	11,146		441		(43		)	11,544
Collateralized mortgage obligations - residential	4,272		16		(11		)	4,277
SBA-guaranteed loan participation certificates	9		—		—			9
	$	101,767	$	457	$	(54	)	$	102,170
December 31, 2017
Certificates of deposit	$	75,916	$	—	$	—		$	75,916
Equity mutual fund	500		—		(1		)	499
Mortgage-backed securities - residential	11,969		520		(17		)	12,472
Collateralized mortgage obligations - residential	4,481		16		(11		)	4,486
SBA-guaranteed loan participation certificates	10		—		—			10
	$	92,876	$	536	$	(29	)	$	93,383

The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at March 31, 2018 and December 31, 2017.

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, 2018
	Amortized Cost		Fair Value
Due in one year or less	$	86,340	$	86,340
Mortgage-backed securities - residential	11,146		11,544
Collateralized mortgage obligations - residential	4,272		4,277
SBA-guaranteed loan participation certificates	9		9
	$	101,767	$	102,170

There were no sales of securities for the periods ended March 31, 2018 and 2017.

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, 2018
Mortgage-backed securities - residential	$	—	$	—		$	1,111	$	(43	)	$	1,111	$	(43	)
Collateralized mortgage obligations - residential	—		—			1,983		(11		)	1,983		(11		)
	$	—	$	—		$	3,094	$	(54	)	$	3,094	$	(54	)
December 31, 2017
Equity mutual fund	$	499	$	(1	)	$	—	$	—		$	499	$	(1	)
Mortgage-backed securities - residential	—		—			1,149		(17		)	1,149		(17		)
Collateralized mortgage obligations - residential	—		—			2,083		(11		)	2,083		(11		)
	$	499	$	(1	)	$	3,232	$	(28	)	$	3,731	$	(29	)

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, 2018, 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.

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Loans Receivable (Notes)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

Loans receivable are as follows:

	March 31, 2018			December 31, 2017
One-to-four family residential real estate	$	92,056		$	97,814
Multi-family mortgage	578,144			588,383
Nonresidential real estate	163,856			169,971
Construction and land	1,328			1,358
Commercial loans	162,564			152,552
Commercial leases	285,222			310,076
Consumer	1,494			1,597
	1,284,664			1,321,751
Net deferred loan origination costs	1,230			1,266
Allowance for loan losses	(8,341		)	(8,366		)
Loans, net	$	1,277,553		$	1,314,651

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, 2018
One-to-four family residential real estate	$	—	$	765	$	765	$	3,576	$	88,480	$	92,056
Multi-family mortgage	—		3,866		3,866		947		577,197		578,144
Nonresidential real estate	—		1,577		1,577		—		163,856		163,856
Construction and land	—		32		32		—		1,328		1,328
Commercial loans	—		1,441		1,441		—		162,564		162,564
Commercial leases	—		650		650		—		285,222		285,222
Consumer	—		10		10		—		1,494		1,494
	$	—	$	8,341	$	8,341	$	4,523	$	1,280,141	1,284,664
Net deferred loan origination costs											1,230
Allowance for loan losses											(8,341		)
Loans, net											$	1,277,553

	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, 2017
One-to-four family residential real estate	$	—	$	850	$	850	$	4,265	$	93,549	$	97,814
Multi-family mortgage	—		3,849		3,849		949		587,434		588,383
Nonresidential real estate	—		1,605		1,605		—		169,971		169,971
Construction and land	—		32		32		—		1,358		1,358
Commercial loans	—		1,357		1,357		—		152,552		152,552
Commercial leases	—		655		655		—		310,076		310,076
Consumer	—		18		18		—		1,597		1,597
	$	—	$	8,366	$	8,366	$	5,214	$	1,316,537	1,321,751
Net deferred loan origination costs											1,266
Allowance for loan losses											(8,366		)
Loans, net											$	1,314,651

Activity in the allowance for loan losses is as follows:

	Three Months Ended March 31,
	2018			2017
Beginning balance	$	8,366		$	8,127
Loans charged off:
One-to-four family residential real estate	(97		)	(171		)
Multi-family mortgage	—			(3		)
Nonresidential real estate	—			(165		)
	(97		)	(339		)
Recoveries:
One-to-four family residential real estate	99			6
Multi-family mortgage	8			11
Commercial loans	223			5
	330			22
Net recoveries (charge-offs)	233			(317		)
Provision for (recovery of) loan losses	(258		)	161
Ending balance	$	8,341		$	7,971

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, 2018
One-to-four family residential real estate	$	1,675	$	1,543	$	—
One-to-four family residential real estate – non-owner occupied	86		46		—
Multi-family mortgage - Illinois	375		369		—
	$	2,136	$	1,958	$	—
December 31, 2017
One-to-four family residential real estate	$	3,413	$	1,918	$	—
One-to-four family residential real estate – non-owner occupied	308		109		—
Multi-family mortgage - Illinois	376		363		—
	$	4,097	$	2,390	$	—

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 $76,000 and $103,000 at March 31, 2018 and December 31, 2017, respectively. When a loan is on nonaccrual status and the ultimate collectability of the total principal of an impaired loan is in doubt, all payments are applied to principal under the cost recovery method. Alternatively, when a loan is on non-accrual status but there is doubt concerning only the ultimate collectability of interest, contractual interest is credited to interest income only when received, under the cash basis method pursuant to the provisions of FASB ASC 310–10, as applicable. In all cases, the average balances are calculated based on the month–end balances of the financing receivables within the period reported pursuant to the provisions of FASB ASC 310–10, as applicable.

The following tables present the aging of the recorded investment of loans at March 31, 2018 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	$	1,875	$	58	$	1,398	$	3,331	$	68,216	$	71,547
One-to-four family residential real estate loans – non-owner occupied	368		10		46		424		19,676		20,100
Multi-family mortgage - Illinois	268		—		271		539		273,950		274,489
Multi-family mortgage - Other	—		—		—		—		299,725		299,725
Nonresidential real estate	940		—		—		940		161,265		162,205
Construction	—		—		—		—		1,096		1,096
Land	—		—		—		—		234		234
Commercial loans:
Regional commercial banking	—		—		—		—		48,160		48,160
Health care	—		—		—		—		69,980		69,980
Direct commercial lessor	—		—		—		—		44,939		44,939
Commercial leases:
Investment rated commercial leases	1,727		152		—		1,879		185,386		187,265
Other commercial leases	572		255		—		827		98,900		99,727
Consumer	—		22		—		22		1,481		1,503
	$	5,750	$	497	$	1,715	$	7,962	$	1,273,008	$	1,280,970

The following tables present the aging of the recorded investment of loans at December 31, 2017 by class of loans:

	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater Past Due		Total Past Due		Loans Not Past Due		Total
One-to-four family residential real estate loans	$	86	$	99	$	1,801	$	1,986	$	74,216	$	76,202
One-to-four family residential real estate loans – non-owner occupied	10		3		86		99		20,944		21,043
Multi-family mortgage - Illinois	172		—		364		536		287,171		287,707
Multi-family mortgage - Other	—		—		—		—		296,440		296,440
Nonresidential real estate	608		—		—		608		166,071		166,679
Construction	—		—		—		—		1,103		1,103
Land	—		—		—		—		259		259
Commercial loans:
Regional commercial banking	—		—		—		—		40,935		40,935
Health care	—		—		—		—		71,738		71,738
Direct commercial lessor	—		—		—		—		40,237		40,237
Commercial leases:
Investment rated commercial leases	934		—		—		934		207,747		208,681
Other commercial leases	288		—		—		288		102,873		103,161
Consumer	—		—		—		—		1,605		1,605
	$	2,098	$	102	$	2,251	$	4,451	$	1,311,339	$	1,315,790

The Company evaluates loan extensions or modifications in accordance with FASB ASC 310–40 with respect to the classification of the loan as a Troubled Debt Restructuring ("TDR"). In general, if the Company grants a loan extension or modification to a borrower for other than an insignificant period of time that includes a below–market interest rate, principal forgiveness, payment forbearance or other concession intended to minimize the economic loss to the Company, the loan extension or loan modification is classified as a TDR. In cases where borrowers are granted new terms that provide for a reduction of either interest or principal then due and payable, management measures any impairment on the restructured loan in the same manner as for impaired loans as noted above.

The Company had $17,000 of TDRs at March 31, 2018 and December 31, 2017. No specific valuation reserves were allocated to those loans at March 31, 2018 and December 31, 2017. 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, 2018		December 31, 2017
One-to-four family residential real estate - nonaccrual	$	17	$	17

During the three months endedMarch 31, 2018 and 2017, there were no loans modified and classified as TDRs.

A TDR is considered to be in payment default once it is 90 days contractually past due under the modified terms.

There were no payment defaults on TDRs during the three months endedMarch 31, 2018 and 2017 within twelve months following the modification.

There were no loan modifications during the three months endedMarch 31, 2018. There were certain loan modifications during the three months endedMarch 31, 2017 that did not meet the definition of a TDR. These loans had a total recorded investment of $133,000 at March 31, 2017. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant.

In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy.

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, including current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans based on credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed on a monthly basis. The Company uses the following definitions for risk ratings:

Special Mention. A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.

Substandard. Loans categorized as Substandard continue to accrue interest, but exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt. The loans continue to accrue interest because they are well secured and collection of principal and interest is expected within a reasonable time. The risk rating guidance published by the Office of the Comptroller of the Currency clarifies that a loan with a well-defined weakness does not have to present a probability of default for the loan to be rated Substandard, and that an individual loan’s loss potential does not have to be distinct for the loan to be rated Substandard.

Nonaccrual. An asset classified Nonaccrual has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

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, 2018, based on the most recent analysis performed, the risk categories of loans by class of loans are as follows:

	Pass		Special Mention		Substandard		Nonaccrual		Total
One-to-four family residential real estate loans	$	70,004	$	—	$	323	$	1,539	$	71,866
One-to-four family residential real estate loans – non-owner occupied	20,105		—		39		46		20,190
Multi-family mortgage loans - Illinois	275,552		—		222		370		276,144
Multi-family mortgage loans - Other	302,000		—		—		—		302,000
Nonresidential real estate loans	163,707		—		149		—		163,856
Construction loans	1,093		—		—		—		1,093
Land loans	235		—		—		—		235
Commercial loans:
Regional commercial banking	43,467		4,644		—		—		48,111
Health care	67,669		—		2,258		—		69,927
Direct commercial lessor	44,526		—		—		—		44,526
Commercial leases:
Investment rated commercial leases	186,052		—		—		—		186,052
Other commercial leases	99,170		—		—		—		99,170
Consumer	1,494		—		—		—		1,494
	$	1,275,074	$	4,644	$	2,991	$	1,955	$	1,284,664

As of December 31, 2017, 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	$	74,437	$	—	$	255	$	1,914	$	76,606
One-to-four family residential real estate loans – non-owner occupied	21,059		—		40		109		21,208
Multi-family mortgage loans - Illinois	290,765		—		225		368		291,358
Multi-family mortgage loans - Other	297,025		—		—		—		297,025
Nonresidential real estate loans	169,817		—		154		—		169,971
Construction loans	1,099		—		—		—		1,099
Land loans	259		—		—		—		259
Commercial loans:
Regional commercial banking	36,373		4,528		—		—		40,901
Health care	69,480		—		2,248		—		71,728
Direct commercial lessor	39,923		—		—		—		39,923
Commercial leases:
Investment rated commercial leases	207,460		—		—		—		207,460
Other commercial leases	102,616		—		—		—		102,616
Consumer	1,597		—		—		—		1,597
	$	1,311,910	$	4,528	$	2,922	$	2,391	$	1,321,751

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Other Real Estate Owned (Notes)

3 Months Ended

Mar. 31, 2018

Other Real Estate [Abstract]

Real Estate Owned [Text Block]

eal estate that is acquired through foreclosure or a deed in lieu of foreclosure is classified as other real estate owned ("OREO") until it is sold. When real estate is acquired through foreclosure or by deed in lieu of foreclosure, it is recorded at its fair value, less the estimated costs of disposal. If the fair value of the property is less than the loan balance, the difference is charged against the allowance for loan losses.

	March 31, 2018							December 31, 2017
	Balance		Valuation Allowance			Net OREO Balance		Balance		Valuation Allowance			Net OREO Balance
One–to–four family residential	$	935	$	—		$	935	$	836	$	(9	)	$	827
Nonresidential real estate	1,140		(277		)	863		1,772		(252		)	1,520
Land	48		(44		)	4		48		(44		)	4
	$	2,123	$	(321	)	$	1,802	$	2,656	$	(305	)	$	2,351

The following represents the roll forward of OREO and the composition of OREO properties:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	2,351		$	3,895
New foreclosed properties	562			1,936
Valuation adjustments	(25		)	(20		)
Sales and payments	(1,086		)	(510		)
Ending balance	$	1,802		$	5,301

Activity in the valuation allowance is as follows:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	305		$	449
Additions charged to expense	25			20
Reductions from sales of OREO	(9		)	(59		)
Ending balance	$	321		$	410

At March 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 December 31, 2017 the balance of OREO included $352,000 foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property without title. At March 31, 2018 and December 31, 2017, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $1.3 million and $1.5 million, respectively.

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2018

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

Stock Ownership Plan. On March 29, 2017, the ESOP was terminated and the ESOP repaid all amounts owing under the ESOP’s Term Loan Agreement with the Company (the “Share Acquisition Loan”). The ESOP repaid the Share Acquisition Loan by transferring 753,490 unallocated shares of the Company’s common stock to the Company in exchange for the full satisfaction of the Share Acquisition Loan, using the valuation method provided for in the ESOP. A total of 78,362 unallocated shares remained in the ESOP after the Share Acquisition Loan was repaid, and these shares were released and will be allocated to the accounts of eligible ESOP participants who were actively employed by the Bank as of March 29, 2017, based on their account balances, subject to the receipt of a favorable IRS determination letter. These transactions resulted in the recording of one-time, non-cash, non-tax deductible equity compensation expense of $1.1 million in the first quarter of 2017. The Share Acquisition Loan had no outstanding principal balance at March 31, 2018 and an outstanding principal balance of $10.8 million at December 31, 2017.

The Company made the Share Acquisition Loan to the ESOP in the original principal amount of $19.6 million in connection with the Company’s mutual to stock conversion in June of 2005. The proceeds of the Share Acquisition Loan were used by the ESOP to purchase 1,957,300 shares of the Company’s common stock issued in the subscription offering at a price of $10.00 per share. The Share Acquisition Loan was secured by a pledge of the acquired shares and the ESOP made annual loan payments with funds it received from the Bank’s discretionary contributions to the ESOP in subsequent years and dividends it received on unallocated shares. As loan payments were made, the Company recorded compensation expense based on the allocation of shares released.

ESOP benefit expense was recorded based upon the fair value of the awarded shares, net of dividends and interest received on unallocated ESOP shares. ESOP benefit expense totaled $1.3 million for the year ended December 31, 2017.

Shares held by the ESOP were as follows:

	March 31, 2018			December 31, 2017
Allocated to participants	1,203,810			1,125,448
Distributed to participants	(317,914		)	(313,223		)
Unearned	—			831,852
Total ESOP shares	885,896			1,644,077
Fair value of unearned shares	$	—		$	12,328

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Equity Incentive Plans (Notes)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Incentive Plans

EQUITY INCENTIVE PLAN

On June 27, 2006, the Company’s stockholders approved the BankFinancial Corporation 2006 Equity Incentive Plan, which authorized the Human Resources Committee of the Board of Directors of the Company to grant a variety of cash- and equity-based incentive awards, including stock options, stock appreciation rights, restricted stock, performance shares and other incentive awards, to employees and directors aggregating up to 3,425,275 shares of the Company’s common stock. The Plan provides that no awards may be granted under the Plan after the ten-year anniversary of the Effective Date. Consequently, no further awards will be granted under this Plan.

As of December 31, 2017, there were 1,752,156 stock options outstanding. The Company recognized $979,000 of equity-based compensation expense relating to the granting of stock options for the year ended December 31, 2017. There was no equity-based compensation expense for the three months endedMarch 31, 2018. A summary of the activity in the stock option plan for 2018 and 2016 follows:

Stock Options	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (1)
Stock options outstanding at December 31, 2015	1,752,156		$	12.30	1.48	$	778
Stock options granted	—		—
Stock options exercised	—		—
Stock options outstanding at December 31, 2016	1,752,156		$	12.30	0.48	$	4,422
Stock options granted	—		—
Stock options exercised	(1,752,156	)	12.30
Stock options outstanding at September 30, 2017	—		$	—	0	$	—

(1) Stock option aggregate intrinsic value represents the number of shares subject to options multiplied by the difference (if positive) in the closing market price of the common stock underlying the options on the date shown and the weighted average exercise price.

During the nine months ended March 31, 2018, 1,752,156 stock options were exercised. All stock options were exercised on a net settlement basis, using a portion of the shares obtained upon exercise to pay the exercise price of the stock option. The net settlements resulted in the issuance of 280,554 shares of the Company's common stock. Certain employees also chose to use a portion of the net shares received upon the exercise to pay required tax withholdings. This reduced the net shares issued by 82,528 shares to 198,026 shares.

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Fair Value (Notes)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value

FAIR VALUE

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values:

• Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

• Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

• Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

The Company used the following methods and significant assumptions to estimate the fair value of each type of financial instrument:

Securities: The fair values of marketable equity securities are generally determined by quoted prices, in active markets, for each specific security (Level 1). If Level 1 measurement inputs are not available for a marketable equity security, we determine its fair value based on the quoted price of a similar security traded in an active market (Level 2). The fair values of debt securities are generally determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities, but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2).

Impaired Loans: The fair value of impaired loans with specific allocations of the allowance for loan losses is generally based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted in accordance with the allowance policy.

Other Real Estate Owned: Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than annually. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach with data from comparable properties. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly.

The following table sets forth the Company’s financial assets that were accounted for at fair value and are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
March 31, 2018
Securities:
Certificates of deposit	$	—	$	86,340	$	—	$	86,340
Equity mutual fund	491		—		—		491
Mortgage-backed securities – residential	—		11,544		—		11,544
Collateralized mortgage obligations – residential	—		4,277		—		4,277
SBA-guaranteed loan participation certificates	—		9		—		9
	$	491	$	102,170	$	—	$	102,661
December 31, 2017
Securities:
Certificates of deposit	$	—	$	75,916	$	—	$	75,916
Equity mutual fund	499		—		—		499
Mortgage-backed securities - residential	—		12,472		—		12,472
Collateralized mortgage obligations – residential	—		4,486		—		4,486
SBA-guaranteed loan participation certificates	—		10		—		10
	$	499	$	92,884	$	—	$	93,383

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
March 31, 2018
Other real estate owned - nonresidential real estate	$	—	$	—	$	409	$	409
December 31, 2017
Other real estate owned:
One-to-four family residential real estate	$	—	$	—	$	102	$	102
Nonresidential real estate	—		—		814		814
	$	—	$	—	$	916	$	916

At March 31, 2018 and December 31, 2017 there were no impaired loans that were measured for impairment using the fair value of the collateral for collateral–dependent loans and which had specific valuation allowances.

OREO, which is carried at the lower of cost or fair value less costs to sell, had a carrying value of $494,000 less a valuation allowance of $85,000, or $409,000, at March 31, 2018, compared to a carrying value of $1.2 million less a valuation allowance of $261,000, or $916,000, at December 31, 2017. There were $25,000 and $20,000 of valuation adjustments of OREO recorded for the three months endedMarch 31, 2018 and 2017, respectively.

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:

	Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range (Weighted Average)
March 31, 2018
Other real estate owned - nonresidential real estate loans	$	409	Sales comparison	Comparison between sales and income approaches	12.70% to 26.77% (13.7%)
December 31, 2017
Other real estate owned
One-to-four family residential real estate	$	102	Sales comparison	Discount applied to valuation	5.6%
Nonresidential real estate	814		Sales comparison	Comparison between sales and income approaches	-3.66% to 15.22% (11.0%)
	$	916

The carrying amount and estimated fair value of financial instruments are as follows:

			Fair Value Measurements at March 31, 2018 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	92,576	$	10,613	$	81,963	$	—	$	92,576
Securities	102,661		491		102,170		—		102,661
Loans receivable, net of allowance for loan losses	1,277,553		—		—		1,276,635		1,276,635
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,900		—		4,900		—		4,900
Financial liabilities
Noninterest-bearing demand deposits	$	232,593	$	—	$	232,593	$	—	$	232,593
NOW and money market accounts	573,886		—		573,886		—		573,886
Savings deposits	160,093		—		160,093		—		160,093
Certificates of deposit	311,435		—		308,904		—		308,904
Borrowings	60,983		—		60,832		—		60,832
Accrued interest payable	180		—		180		—		180

			Fair Value Measurements at  December 31, 2017 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	127,592	$	13,572	$	114,020	$	—	$	127,592
Securities	93,383		499		92,884		—		93,383
Loans receivable, net of allowance for loan losses	1,314,651		—		1,323,139		—		1,323,139
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,619		—		4,619		—		4,619
Financial liabilities
Noninterest-bearing demand deposits	$	234,354	$	—	$	234,354	$	—	$	234,354
NOW and money market accounts	589,238		—		589,238		—		589,238
Savings deposits	160,501		—		160,501		—		160,501
Certificates of deposit	355,958		—		353,969		—		353,969
Borrowings	60,768		—		60,627		—		60,627
Accrued interest payable	147		—		147		—		147

For purposes of the above, the following assumptions were used:

Cash and Cash Equivalents: The estimated fair values for cash and cash equivalents are based on their carrying value due to the short-term nature of these assets.

Loans: At March 31, 2018, 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.

At December 31, 2017, the estimated fair value for loans has been determined by calculating the present value of future cash flows based on the current rate the Company would charge for similar loans with similar maturities, applied for an estimated time period until the loan is assumed to be repriced or repaid. The methods utilized to estimate fair value of loans do not necessarily represent an exit price.

FHLB and FRB Stock: It is not practicable to determine the fair value of FHLB and FRB stock due to the restrictions placed on their transferability.

Deposit Liabilities: The estimated fair value for certificates of deposit has been determined by calculating the present value of future cash flows based on estimates of rates the Company would pay on such deposits, applied for the time period until maturity. The estimated fair values of noninterest-bearing demand, NOW, money market, and savings deposits are assumed to approximate their carrying values as management establishes rates on these deposits at a level that approximates the local market area. Additionally, these deposits can be withdrawn on demand.

Borrowings: The estimated fair values of advances from the FHLB and notes payable are based on current market rates for similar financing. The estimated fair value of securities sold under agreements to repurchase is assumed to equal its carrying value due to the short-term nature of the liability.

Accrued Interest: The estimated fair values of accrued interest receivable and payable are assumed to equal their carrying value.

Off-Balance-Sheet Instruments: Off-balance-sheet items consist principally of unfunded loan commitments, standby letters of credit, and unused lines of credit. The estimated fair values of unfunded loan commitments, standby letters of credit, and unused lines of credit are not material.

While the above estimates are based on management’s judgment of the most appropriate factors, as of the balance sheet date, there is no assurance that the estimated fair values would have been realized if the assets were disposed of or the liabilities settled at that date, since market values may differ depending on the various circumstances. The estimated fair values would also not apply to subsequent dates.

In addition, other assets and liabilities that are not financial instruments, such as premises and equipment, are not included in the above disclosures.

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Revenue From Contracts With Customers

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Abstract]

Revenue From Contracts With Customers

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 for the three months endedMarch 31, 2018 and 2017. Items outside of the scope of the ASC 606 are noted as such.

	Three Months Ended March 31,
	2018		2017
Deposit service charges and fees	$	978	$	950
Loan fee income (1)	70		60
Commercial mortgage brokerage fees (1)	41		—
Residential mortgage banking fees (1)	30		44
Trust and insurance commissions and annuities income	213		249
Earnings on bank owned life insurance (1)	66		63
Other (1)	141		178
Total noninterest income	$	1,539	$	1,544

(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 for transaction-based, 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 for the three months endedMarch 31, 2018 and 2017 were $361,000 and $350,000, respectively. These are 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 endedMarch 31, 2018 and March 31, 2017 were not financed by the Bank.

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Subsequent Events

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

SUBSEQUENT EVENTS

In April 2018, the Bank recorded income from a death benefit on BOLI of $1.4 million related to the death of a former Bank executive.

On April 23, 2018, the Bank sold its office building located at 15W060 North Frontage Road, Burr Ridge, Illinois, for a purchase price of $6 million.  A net gain in the approximate amount $100,000will be recorded in the second quarter of 2018 in connection with the sale.  Concurrently with the sale, the Bank entered into a six-month lease of the office building with the purchaser, and intends to lease space in a different building following the expiration of the lease with the purchaser.  The Company shares space with the Bank in the office building pursuant to an expense allocation agreement.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation: BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, 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, 2018 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2018 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.

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, 2017, as filed with the Securities and Exchange Commission.

Recent Accounti

Basis of Presentation

Basis of Presentation: BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois (the “Company”), is the owner of all of the issued and outstanding capital stock of BankFinancial, 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, 2018 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2018 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 $76,000 and $103,000 at March 31, 2018 and December 31, 2017, 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, 2017, as filed with the Securities and Exchange Commission.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update became effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. We have evaluated the impact of adopting the update and have concluded that it does not have a significant impact to our consolidated financial statements. The Company’s revenue streams that are in-scope from the update include: financed OREO sales; deposit fees, including ATM fees, overdraft fees, maintenance fees and dormancy fees; debit card fees, and trust fees. For the in-scope revenue streams, our current revenue recognition is not different than our prior revenue recognition under the update. The Company has infrequently financed an OREO sale. Our customer contracts generally do not have performance obligations and fees are assessed and collected as the transaction occurs. The Company’s fee income is not material for any individual income streams. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue stream; as such, no cumulative effect adjustment was recorded. Refer to Note 8 - Revenue for Contracts with Customers for further discussion on the Company's accounting policies for revenue sources within the scope of ASC 606.

In January 2016, the FASB issued an update (ASU No. 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Liabilities). The new guidance is intended to improve the recognition and measurement of financial instruments by requiring: equity investments (other than equity method or consolidation) to be measured at fair value with changes in fair value recognized in net income; public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; eliminating the requirement for non-public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is to be required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requiring a reporting organization to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance became effective for public business entities for fiscal years beginning after December 15, 2017. The new pronouncement does not have a significant impact on our Statement of Operations, as we only have one equity security that was valued at $491,000 and $499,000 at March 31, 2018 and December 31, 2017, respectively. The equity security is reported separately on the Statement of Condition as a result the adoption of this pronouncement.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. ASU 2016-02 is effectivefor fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our consolidated financial statements as the projected minimum lease payments under existing leases subject to the new pronouncement are less than one percent of our current total assets.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”).  These amendments require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration.  ASU 2016-13 is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 (i.e., January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our initial review indicates that we have maintained sufficient historical loan data to support the requirements of this pronouncement. In addition, we have begun tracking the average life of the various segments of our loan portfolio. We are currently evaluating various loss methodologies to determine their correlation to our various loan categories' historical performance.

In March of 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“ASU 2017-08”). This guidance shortens the amortization period for premiums on certain callable debt securities to the earliest call date (with an explicit, noncontingent call feature that is callable at a fixed price and on a preset dates), rather than contractual maturity date as currently required under GAAP. The ASU does not impact instruments without preset call dates such as mortgage-backed securities.  For instruments with contingent call features, once the contingency is resolved and the security is callable at a fixed price and preset date, the security is within the scope of the ASU.  ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted.  Effective January 2017, we early adopted the pronouncement. Adoption of the new pronouncement was immaterial to the consolidated financial statements.

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Summary of Significant Accounting Policies New Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update became effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. We have evaluated the impact of adopting the update and have concluded that it does not have a significant impact to our consolidated financial statements. The Company’s revenue streams that are in-scope from the update include: financed OREO sales; deposit fees, including ATM fees, overdraft fees, maintenance fees and dormancy fees; debit card fees, and trust fees. For the in-scope revenue streams, our current revenue recognition is not different than our prior revenue recognition under the update. The Company has infrequently financed an OREO sale. Our customer contracts generally do not have performance obligations and fees are assessed and collected as the transaction occurs. The Company’s fee income is not material for any individual income streams. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue stream; as such, no cumulative effect adjustment was recorded. Refer to Note 8 - Revenue for Contracts with Customers for further discussion on the Company's accounting policies for revenue sources within the scope of ASC 606.

In January 2016, the FASB issued an update (ASU No. 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Liabilities). The new guidance is intended to improve the recognition and measurement of financial instruments by requiring: equity investments (other than equity method or consolidation) to be measured at fair value with changes in fair value recognized in net income; public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; eliminating the requirement for non-public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is to be required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requiring a reporting organization to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance became effective for public business entities for fiscal years beginning after December 15, 2017. The new pronouncement does not have a significant impact on our Statement of Operations, as we only have one equity security that was valued at $491,000 and $499,000 at March 31, 2018 and December 31, 2017, respectively. The equity security is reported separately on the Statement of Condition as a result the adoption of this pronouncement.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 months. ASU 2016-02 is effectivefor fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our preliminary finding is that the new pronouncement will not have a significant impact on our consolidated financial statements as the projected minimum lease payments under existing leases subject to the new pronouncement are less than one percent of our current total assets.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”).  These amendments require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration.  ASU 2016-13 is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 (i.e., January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently evaluating the impact that the standard will have on our consolidated financial statements. Our initial review indicates that we have maintained sufficient historical loan data to support the requirements of this pronouncement. In addition, we have begun tracking the average life of the various segments of our loan portfolio. We are currently evaluating various loss methodologies to determine their correlation to our various loan categories' historical performance.

In March of 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” (“ASU 2017-08”). This guidance shortens the amortization period for premiums on certain callable debt securities to the earliest call date (with an explicit, noncontingent call feature that is callable at a fixed price and on a preset dates), rather than contractual maturity date as currently required under GAAP. The ASU does not impact instruments without preset call dates such as mortgage-backed securities.  For instruments with contingent call features, once the contingency is resolved and the security is callable at a fixed price and preset date, the security is within the scope of the ASU.  ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and early adoption is permitted.  Effective January 2017, we early adopted the pronouncement. Adoption of the new pronouncement was immaterial to the consolidated financial statements.

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

ngs per share reflect earnings available to common stockholders for the period divided by the weighted average number of shares of common stock outstanding during the period, exclusive of unearned BankFinancial, NA Employee Stock Ownership Plan (the "ESOP") shares in 2017 and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock.

	Three Months Ended March 31,
	2018			2017
Net income available to common stockholders	$	3,559		$	1,881
Average common shares outstanding	17,931,579			19,243,941
Less:
Unearned ESOP shares	—			(600,947		)
Unvested restricted stock shares	(940		)	(940		)
Weighted average common shares outstanding	17,930,639			18,642,054
Add - Net effect of dilutive unvested restricted stock	461			5,462
Diluted weighted average common shares outstanding	17,931,100			18,647,516
Basic earnings per common share	$	0.20		$	0.10
Diluted earnings per common share	$	0.20		$	0.10

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Securities (Tables)

3 Months Ended

Mar. 31, 2018

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
March 31, 2018
Certificates of deposit	$	86,340	$	—	$	—		$	86,340
Mortgage-backed securities - residential	11,146		441		(43		)	11,544
Collateralized mortgage obligations - residential	4,272		16		(11		)	4,277
SBA-guaranteed loan participation certificates	9		—		—			9
	$	101,767	$	457	$	(54	)	$	102,170
December 31, 2017
Certificates of deposit	$	75,916	$	—	$	—		$	75,916
Equity mutual fund	500		—		(1		)	499
Mortgage-backed securities - residential	11,969		520		(17		)	12,472
Collateralized mortgage obligations - residential	4,481		16		(11		)	4,486
SBA-guaranteed loan participation certificates	10		—		—			10
	$	92,876	$	536	$	(29	)	$	93,383

The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at March 31, 2018 and December 31, 2017.

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, 2018
	Amortized Cost		Fair Value
Due in one year or less	$	86,340	$	86,340
Mortgage-backed securities - residential	11,146		11,544
Collateralized mortgage obligations - residential	4,272		4,277
SBA-guaranteed loan participation certificates	9		9
	$	101,767	$	102,170

There were no sales of securities for the periods ended March 31, 2018 and 2017.

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, 2018
Mortgage-backed securities - residential	$	—	$	—		$	1,111	$	(43	)	$	1,111	$	(43	)
Collateralized mortgage obligations - residential	—		—			1,983		(11		)	1,983		(11		)
	$	—	$	—		$	3,094	$	(54	)	$	3,094	$	(54	)
December 31, 2017
Equity mutual fund	$	499	$	(1	)	$	—	$	—		$	499	$	(1	)
Mortgage-backed securities - residential	—		—			1,149		(17		)	1,149		(17		)
Collateralized mortgage obligations - residential	—		—			2,083		(11		)	2,083		(11		)
	$	499	$	(1	)	$	3,232	$	(28	)	$	3,731	$	(29	)

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, 2018, but the unrealized losses were not considered significant under the Company’s impairment testing methodology. In addition, the Company does not intend to sell these securities, and it is likely that the Company will not be required to sell these securities before their anticipated recovery occurs.

Unrealized gains and losses recognized in accumulated other comprehensive income (loss)

The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below.

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2018
Certificates of deposit	$	86,340	$	—	$	—		$	86,340
Mortgage-backed securities - residential	11,146		441		(43		)	11,544
Collateralized mortgage obligations - residential	4,272		16		(11		)	4,277
SBA-guaranteed loan participation certificates	9		—		—			9
	$	101,767	$	457	$	(54	)	$	102,170
December 31, 2017
Certificates of deposit	$	75,916	$	—	$	—		$	75,916
Equity mutual fund	500		—		(1		)	499
Mortgage-backed securities - residential	11,969		520		(17		)	12,472
Collateralized mortgage obligations - residential	4,481		16		(11		)	4,486
SBA-guaranteed loan participation certificates	10		—		—			10
	$	92,876	$	536	$	(29	)	$	93,383

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, 2018
	Amortized Cost		Fair Value
Due in one year or less	$	86,340	$	86,340
Mortgage-backed securities - residential	11,146		11,544
Collateralized mortgage obligations - residential	4,272		4,277
SBA-guaranteed loan participation certificates	9		9
	$	101,767	$	102,170

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, 2018
Mortgage-backed securities - residential	$	—	$	—		$	1,111	$	(43	)	$	1,111	$	(43	)
Collateralized mortgage obligations - residential	—		—			1,983		(11		)	1,983		(11		)
	$	—	$	—		$	3,094	$	(54	)	$	3,094	$	(54	)
December 31, 2017
Equity mutual fund	$	499	$	(1	)	$	—	$	—		$	499	$	(1	)
Mortgage-backed securities - residential	—		—			1,149		(17		)	1,149		(17		)
Collateralized mortgage obligations - residential	—		—			2,083		(11		)	2,083		(11		)
	$	499	$	(1	)	$	3,232	$	(28	)	$	3,731	$	(29	)

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Loans Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans By Class Modified As Troubled Debt Restructurings With Payment Default [Table Text Block]

TDRs during the three months endedMarch 31, 2018 and 2017 within twelve months following the modification.

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

Loans receivable are as follows:

	March 31, 2018			December 31, 2017
One-to-four family residential real estate	$	92,056		$	97,814
Multi-family mortgage	578,144			588,383
Nonresidential real estate	163,856			169,971
Construction and land	1,328			1,358
Commercial loans	162,564			152,552
Commercial leases	285,222			310,076
Consumer	1,494			1,597
	1,284,664			1,321,751
Net deferred loan origination costs	1,230			1,266
Allowance for loan losses	(8,341		)	(8,366		)
Loans, net	$	1,277,553		$	1,314,651

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, 2018
One-to-four family residential real estate	$	—	$	765	$	765	$	3,576	$	88,480	$	92,056
Multi-family mortgage	—		3,866		3,866		947		577,197		578,144
Nonresidential real estate	—		1,577		1,577		—		163,856		163,856
Construction and land	—		32		32		—		1,328		1,328
Commercial loans	—		1,441		1,441		—		162,564		162,564
Commercial leases	—		650		650		—		285,222		285,222
Consumer	—		10		10		—		1,494		1,494
	$	—	$	8,341	$	8,341	$	4,523	$	1,280,141	1,284,664
Net deferred loan origination costs											1,230
Allowance for loan losses											(8,341		)
Loans, net											$	1,277,553

	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, 2017
One-to-four family residential real estate	$	—	$	850	$	850	$	4,265	$	93,549	$	97,814
Multi-family mortgage	—		3,849		3,849		949		587,434		588,383
Nonresidential real estate	—		1,605		1,605		—		169,971		169,971
Construction and land	—		32		32		—		1,358		1,358
Commercial loans	—		1,357		1,357		—		152,552		152,552
Commercial leases	—		655		655		—		310,076		310,076
Consumer	—		18		18		—		1,597		1,597
	$	—	$	8,366	$	8,366	$	5,214	$	1,316,537	1,321,751
Net deferred loan origination costs											1,266
Allowance for loan losses											(8,366		)
Loans, net											$	1,314,651

Activity in the allowance for loan losses is as follows:

	Three Months Ended March 31,
	2018			2017
Beginning balance	$	8,366		$	8,127
Loans charged off:
One-to-four family residential real estate	(97		)	(171		)
Multi-family mortgage	—			(3		)
Nonresidential real estate	—			(165		)
	(97		)	(339		)
Recoveries:
One-to-four family residential real estate	99			6
Multi-family mortgage	8			11
Commercial loans	223			5
	330			22
Net recoveries (charge-offs)	233			(317		)
Provision for (recovery of) loan losses	(258		)	161
Ending balance	$	8,341		$	7,971

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, 2018
One-to-four family residential real estate	$	1,675	$	1,543	$	—
One-to-four family residential real estate – non-owner occupied	86		46		—
Multi-family mortgage - Illinois	375		369		—
	$	2,136	$	1,958	$	—
December 31, 2017
One-to-four family residential real estate	$	3,413	$	1,918	$	—
One-to-four family residential real estate – non-owner occupied	308		109		—
Multi-family mortgage - Illinois	376		363		—
	$	4,097	$	2,390	$	—

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 $76,000 and $103,000 at March 31, 2018 and December 31, 2017, respectively. When a loan is on nonaccrual status and the ultimate collectability of the total principal of an impaired loan is in doubt, all payments are applied to principal under the cost recovery method. Alternatively, when a loan is on non-accrual status but there is doubt concerning only the ultimate collectability of interest, contractual interest is credited to interest income only when received, under the cash basis method pursuant to the provisions of FASB ASC 310–10, as applicable. In all cases, the average balances are calculated based on the month–end balances of the financing receivables within the period reported pursuant to the provisions of FASB ASC 310–10, as applicable.

The following tables present the aging of the recorded investment of loans at March 31, 2018 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	$	1,875	$	58	$	1,398	$	3,331	$	68,216	$	71,547
One-to-four family residential real estate loans – non-owner occupied	368		10		46		424		19,676		20,100
Multi-family mortgage - Illinois	268		—		271		539		273,950		274,489
Multi-family mortgage - Other	—		—		—		—		299,725		299,725
Nonresidential real estate	940		—		—		940		161,265		162,205
Construction	—		—		—		—		1,096		1,096
Land	—		—		—		—		234		234
Commercial loans:
Regional commercial banking	—		—		—		—		48,160		48,160
Health care	—		—		—		—		69,980		69,980
Direct commercial lessor	—		—		—		—		44,939		44,939
Commercial leases:
Investment rated commercial leases	1,727		152		—		1,879		185,386		187,265
Other commercial leases	572		255		—		827		98,900		99,727
Consumer	—		22		—		22		1,481		1,503
	$	5,750	$	497	$	1,715	$	7,962	$	1,273,008	$	1,280,970

The following tables present the aging of the recorded investment of loans at December 31, 2017 by class of loans:

	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater Past Due		Total Past Due		Loans Not Past Due		Total
One-to-four family residential real estate loans	$	86	$	99	$	1,801	$	1,986	$	74,216	$	76,202
One-to-four family residential real estate loans – non-owner occupied	10		3		86		99		20,944		21,043
Multi-family mortgage - Illinois	172		—		364		536		287,171		287,707
Multi-family mortgage - Other	—		—		—		—		296,440		296,440
Nonresidential real estate	608		—		—		608		166,071		166,679
Construction	—		—		—		—		1,103		1,103
Land	—		—		—		—		259		259
Commercial loans:
Regional commercial banking	—		—		—		—		40,935		40,935
Health care	—		—		—		—		71,738		71,738
Direct commercial lessor	—		—		—		—		40,237		40,237
Commercial leases:
Investment rated commercial leases	934		—		—		934		207,747		208,681
Other commercial leases	288		—		—		288		102,873		103,161
Consumer	—		—		—		—		1,605		1,605
	$	2,098	$	102	$	2,251	$	4,451	$	1,311,339	$	1,315,790

The Company evaluates loan extensions or modifications in accordance with FASB ASC 310–40 with respect to the classification of the loan as a Troubled Debt Restructuring ("TDR"). In general, if the Company grants a loan extension or modification to a borrower for other than an insignificant period of time that includes a below–market interest rate, principal forgiveness, payment forbearance or other concession intended to minimize the economic loss to the Company, the loan extension or loan modification is classified as a TDR. In cases where borrowers are granted new terms that provide for a reduction of either interest or principal then due and payable, management measures any impairment on the restructured loan in the same manner as for impaired loans as noted above.

The Company had $17,000 of TDRs at March 31, 2018 and December 31, 2017. No specific valuation reserves were allocated to those loans at March 31, 2018 and December 31, 2017. 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, 2018		December 31, 2017
One-to-four family residential real estate - nonaccrual	$	17	$	17

During the three months endedMarch 31, 2018 and 2017, there were no loans modified and classified as TDRs.

A TDR is considered to be in payment default once it is 90 days contractually past due under the modified terms.

There were no payment defaults on TDRs during the three months endedMarch 31, 2018 and 2017 within twelve months following the modification.

There were no loan modifications during the three months endedMarch 31, 2018. There were certain loan modifications during the three months endedMarch 31, 2017 that did not meet the definition of a TDR. These loans had a total recorded investment of $133,000 at March 31, 2017. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant.

In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy.

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, including current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans based on credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed on a monthly basis. The Company uses the following definitions for risk ratings:

Special Mention. A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.

Substandard. Loans categorized as Substandard continue to accrue interest, but exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt. The loans continue to accrue interest because they are well secured and collection of principal and interest is expected within a reasonable time. The risk rating guidance published by the Office of the Comptroller of the Currency clarifies that a loan with a well-defined weakness does not have to present a probability of default for the loan to be rated Substandard, and that an individual loan’s loss potential does not have to be distinct for the loan to be rated Substandard.

Nonaccrual. An asset classified Nonaccrual has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

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, 2018, based on the most recent analysis performed, the risk categories of loans by class of loans are as follows:

	Pass		Special Mention		Substandard		Nonaccrual		Total
One-to-four family residential real estate loans	$	70,004	$	—	$	323	$	1,539	$	71,866
One-to-four family residential real estate loans – non-owner occupied	20,105		—		39		46		20,190
Multi-family mortgage loans - Illinois	275,552		—		222		370		276,144
Multi-family mortgage loans - Other	302,000		—		—		—		302,000
Nonresidential real estate loans	163,707		—		149		—		163,856
Construction loans	1,093		—		—		—		1,093
Land loans	235		—		—		—		235
Commercial loans:
Regional commercial banking	43,467		4,644		—		—		48,111
Health care	67,669		—		2,258		—		69,927
Direct commercial lessor	44,526		—		—		—		44,526
Commercial leases:
Investment rated commercial leases	186,052		—		—		—		186,052
Other commercial leases	99,170		—		—		—		99,170
Consumer	1,494		—		—		—		1,494
	$	1,275,074	$	4,644	$	2,991	$	1,955	$	1,284,664

As of December 31, 2017, 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	$	74,437	$	—	$	255	$	1,914	$	76,606
One-to-four family residential real estate loans – non-owner occupied	21,059		—		40		109		21,208
Multi-family mortgage loans - Illinois	290,765		—		225		368		291,358
Multi-family mortgage loans - Other	297,025		—		—		—		297,025
Nonresidential real estate loans	169,817		—		154		—		169,971
Construction loans	1,099		—		—		—		1,099
Land loans	259		—		—		—		259
Commercial loans:
Regional commercial banking	36,373		4,528		—		—		40,901
Health care	69,480		—		2,248		—		71,728
Direct commercial lessor	39,923		—		—		—		39,923
Commercial leases:
Investment rated commercial leases	207,460		—		—		—		207,460
Other commercial leases	102,616		—		—		—		102,616
Consumer	1,597		—		—		—		1,597
	$	1,311,910	$	4,528	$	2,922	$	2,391	$	1,321,751

Loans receivable

Loans receivable are as follows:

	March 31, 2018			December 31, 2017
One-to-four family residential real estate	$	92,056		$	97,814
Multi-family mortgage	578,144			588,383
Nonresidential real estate	163,856			169,971
Construction and land	1,328			1,358
Commercial loans	162,564			152,552
Commercial leases	285,222			310,076
Consumer	1,494			1,597
	1,284,664			1,321,751
Net deferred loan origination costs	1,230			1,266
Allowance for loan losses	(8,341		)	(8,366		)
Loans, net	$	1,277,553		$	1,314,651

Loans Receivable Based On Impairment Method [Table Text Block]

The following tables present the balance in the allowance for loan losses and the loans receivable by portfolio segment and based on impairment method:

	Allowance for loan losses						Loan Balances
	Individually evaluated  for impairment		Collectively evaluated  for impairment		Total		Individually evaluated  for impairment		Collectively evaluated  for impairment		Total
March 31, 2018
One-to-four family residential real estate	$	—	$	765	$	765	$	3,576	$	88,480	$	92,056
Multi-family mortgage	—		3,866		3,866		947		577,197		578,144
Nonresidential real estate	—		1,577		1,577		—		163,856		163,856
Construction and land	—		32		32		—		1,328		1,328
Commercial loans	—		1,441		1,441		—		162,564		162,564
Commercial leases	—		650		650		—		285,222		285,222
Consumer	—		10		10		—		1,494		1,494
	$	—	$	8,341	$	8,341	$	4,523	$	1,280,141	1,284,664
Net deferred loan origination costs											1,230
Allowance for loan losses											(8,341		)
Loans, net											$	1,277,553

Allowance for loan losses

ctivity in the allowance for loan losses is as follows:

	Three Months Ended March 31,
	2018			2017
Beginning balance	$	8,366		$	8,127
Loans charged off:
One-to-four family residential real estate	(97		)	(171		)
Multi-family mortgage	—			(3		)
Nonresidential real estate	—			(165		)
	(97		)	(339		)
Recoveries:
One-to-four family residential real estate	99			6
Multi-family mortgage	8			11
Commercial loans	223			5
	330			22
Net recoveries (charge-offs)	233			(317		)
Provision for (recovery of) loan losses	(258		)	161
Ending balance	$	8,341		$	7,971

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, 2018
One-to-four family residential real estate	$	1,675	$	1,543	$	—
One-to-four family residential real estate – non-owner occupied	86		46		—
Multi-family mortgage - Illinois	375		369		—
	$	2,136	$	1,958	$	—
December 31, 2017
One-to-four family residential real estate	$	3,413	$	1,918	$	—
One-to-four family residential real estate – non-owner occupied	308		109		—
Multi-family mortgage - Illinois	376		363		—
	$	4,097	$	2,390	$	—

Past Due Financing Receivables

The following tables present the aging of the recorded investment of loans at March 31, 2018 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	$	1,875	$	58	$	1,398	$	3,331	$	68,216	$	71,547
One-to-four family residential real estate loans – non-owner occupied	368		10		46		424		19,676		20,100
Multi-family mortgage - Illinois	268		—		271		539		273,950		274,489
Multi-family mortgage - Other	—		—		—		—		299,725		299,725
Nonresidential real estate	940		—		—		940		161,265		162,205
Construction	—		—		—		—		1,096		1,096
Land	—		—		—		—		234		234
Commercial loans:
Regional commercial banking	—		—		—		—		48,160		48,160
Health care	—		—		—		—		69,980		69,980
Direct commercial lessor	—		—		—		—		44,939		44,939
Commercial leases:
Investment rated commercial leases	1,727		152		—		1,879		185,386		187,265
Other commercial leases	572		255		—		827		98,900		99,727
Consumer	—		22		—		22		1,481		1,503
	$	5,750	$	497	$	1,715	$	7,962	$	1,273,008	$	1,280,970

Troubled Debt Restructurings on Financing Receivables

The following table presents loans classified as TDRs:

	March 31, 2018		December 31, 2017
One-to-four family residential real estate - nonaccrual	$	17	$	17

Financing Receivable Credit Quality Indicators

As of March 31, 2018, based on the most recent analysis performed, the risk categories of loans by class of loans are as follows:

	Pass		Special Mention		Substandard		Nonaccrual		Total
One-to-four family residential real estate loans	$	70,004	$	—	$	323	$	1,539	$	71,866
One-to-four family residential real estate loans – non-owner occupied	20,105		—		39		46		20,190
Multi-family mortgage loans - Illinois	275,552		—		222		370		276,144
Multi-family mortgage loans - Other	302,000		—		—		—		302,000
Nonresidential real estate loans	163,707		—		149		—		163,856
Construction loans	1,093		—		—		—		1,093
Land loans	235		—		—		—		235
Commercial loans:
Regional commercial banking	43,467		4,644		—		—		48,111
Health care	67,669		—		2,258		—		69,927
Direct commercial lessor	44,526		—		—		—		44,526
Commercial leases:
Investment rated commercial leases	186,052		—		—		—		186,052
Other commercial leases	99,170		—		—		—		99,170
Consumer	1,494		—		—		—		1,494
	$	1,275,074	$	4,644	$	2,991	$	1,955	$	1,284,664

Loans By Class Modified As Troubled Debt Restructuring On Financing Receivables [Table Text Block]

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Other Real Estate Owned (Tables)

3 Months Ended

Mar. 31, 2018

Other Real Estate [Abstract]

Schedule of Real Estate Properties [Table Text Block]

	March 31, 2018							December 31, 2017
	Balance		Valuation Allowance			Net OREO Balance		Balance		Valuation Allowance			Net OREO Balance
One–to–four family residential	$	935	$	—		$	935	$	836	$	(9	)	$	827
Nonresidential real estate	1,140		(277		)	863		1,772		(252		)	1,520
Land	48		(44		)	4		48		(44		)	4
	$	2,123	$	(321	)	$	1,802	$	2,656	$	(305	)	$	2,351

Real Estate Owned, rollforward [Table Text Block]

	March 31, 2018							December 31, 2017
	Balance		Valuation Allowance			Net OREO Balance		Balance		Valuation Allowance			Net OREO Balance
One–to–four family residential	$	935	$	—		$	935	$	836	$	(9	)	$	827
Nonresidential real estate	1,140		(277		)	863		1,772		(252		)	1,520
Land	48		(44		)	4		48		(44		)	4
	$	2,123	$	(321	)	$	1,802	$	2,656	$	(305	)	$	2,351

The following represents the roll forward of OREO and the composition of OREO properties:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	2,351		$	3,895
New foreclosed properties	562			1,936
Valuation adjustments	(25		)	(20		)
Sales and payments	(1,086		)	(510		)
Ending balance	$	1,802		$	5,301

OREO valuation allowance, rollforward [Table Text Block]

Activity in the valuation allowance is as follows:

	For the Three Months Ended March 31,
	2018			2017
Beginning balance	$	305		$	449
Additions charged to expense	25			20
Reductions from sales of OREO	(9		)	(59		)
Ending balance	$	321		$	410

At March 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 December 31, 2017 the balance of OREO included $352,000 foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property without title. At March 31, 2018 and December 31, 2017, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $1.3 million and $1.5 million, respectively.

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Compensation and Retirement Disclosure [Abstract]

Schedule of Employee Stock Ownership Plan (ESOP) Disclosures

Shares held by the ESOP were as follows:

	March 31, 2018			December 31, 2017
Allocated to participants	1,203,810			1,125,448
Distributed to participants	(317,914		)	(313,223		)
Unearned	—			831,852
Total ESOP shares	885,896			1,644,077
Fair value of unearned shares	$	—		$	12,328

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Equity Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Activity

A summary of the activity in the stock option plan for 2018 and 2016 follows:

Stock Options	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (1)
Stock options outstanding at December 31, 2015	1,752,156		$	12.30	1.48	$	778
Stock options granted	—		—
Stock options exercised	—		—
Stock options outstanding at December 31, 2016	1,752,156		$	12.30	0.48	$	4,422
Stock options granted	—		—
Stock options exercised	(1,752,156	)	12.30
Stock options outstanding at September 30, 2017	—		$	—	0	$	—

(1) Stock option aggregate intrinsic value represents the number of shares subject to options multiplied by the difference (if positive) in the closing market price of the common stock underlying the options on the date shown and the weighted average exercise price.

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2018

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, 2018
Securities:
Certificates of deposit	$	—	$	86,340	$	—	$	86,340
Equity mutual fund	491		—		—		491
Mortgage-backed securities – residential	—		11,544		—		11,544
Collateralized mortgage obligations – residential	—		4,277		—		4,277
SBA-guaranteed loan participation certificates	—		9		—		9
	$	491	$	102,170	$	—	$	102,661
December 31, 2017
Securities:
Certificates of deposit	$	—	$	75,916	$	—	$	75,916
Equity mutual fund	499		—		—		499
Mortgage-backed securities - residential	—		12,472		—		12,472
Collateralized mortgage obligations – residential	—		4,486		—		4,486
SBA-guaranteed loan participation certificates	—		10		—		10
	$	499	$	92,884	$	—	$	93,383

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
March 31, 2018
Other real estate owned - nonresidential real estate	$	—	$	—	$	409	$	409
December 31, 2017
Other real estate owned:
One-to-four family residential real estate	$	—	$	—	$	102	$	102
Nonresidential real estate	—		—		814		814
	$	—	$	—	$	916	$	916

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:

	Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range (Weighted Average)
March 31, 2018
Other real estate owned - nonresidential real estate loans	$	409	Sales comparison	Comparison between sales and income approaches	12.70% to 26.77% (13.7%)
December 31, 2017
Other real estate owned
One-to-four family residential real estate	$	102	Sales comparison	Discount applied to valuation	5.6%
Nonresidential real estate	814		Sales comparison	Comparison between sales and income approaches	-3.66% to 15.22% (11.0%)
	$	916

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, 2018 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	92,576	$	10,613	$	81,963	$	—	$	92,576
Securities	102,661		491		102,170		—		102,661
Loans receivable, net of allowance for loan losses	1,277,553		—		—		1,276,635		1,276,635
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,900		—		4,900		—		4,900
Financial liabilities
Noninterest-bearing demand deposits	$	232,593	$	—	$	232,593	$	—	$	232,593
NOW and money market accounts	573,886		—		573,886		—		573,886
Savings deposits	160,093		—		160,093		—		160,093
Certificates of deposit	311,435		—		308,904		—		308,904
Borrowings	60,983		—		60,832		—		60,832
Accrued interest payable	180		—		180		—		180

			Fair Value Measurements at  December 31, 2017 Using:
	Carrying Amount		Level 1		Level 2		Level 3		Total
Financial assets
Cash and cash equivalents	$	127,592	$	13,572	$	114,020	$	—	$	127,592
Securities	93,383		499		92,884		—		93,383
Loans receivable, net of allowance for loan losses	1,314,651		—		1,323,139		—		1,323,139
FHLB and FRB stock	8,290		—		—		—		N/A
Accrued interest receivable	4,619		—		4,619		—		4,619
Financial liabilities
Noninterest-bearing demand deposits	$	234,354	$	—	$	234,354	$	—	$	234,354
NOW and money market accounts	589,238		—		589,238		—		589,238
Savings deposits	160,501		—		160,501		—		160,501
Certificates of deposit	355,958		—		353,969		—		353,969
Borrowings	60,768		—		60,627		—		60,627
Accrued interest payable	147		—		147		—		147

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Revenue From Contracts With Customers (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Abstract]

Noninterest Income Outside the Scope of ASC 606

The following table presents the Company's sources of noninterest income for the three months endedMarch 31, 2018 and 2017. Items outside of the scope of the ASC 606 are noted as such.

	Three Months Ended March 31,
	2018		2017
Deposit service charges and fees	$	978	$	950
Loan fee income (1)	70		60
Commercial mortgage brokerage fees (1)	41		—
Residential mortgage banking fees (1)	30		44
Trust and insurance commissions and annuities income	213		249
Earnings on bank owned life insurance (1)	66		63
Other (1)	141		178
Total noninterest income	$	1,539	$	1,544

(1)    Not within the scope of ASC 606

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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders	$ 3,559	$ 1,881
Average common shares outstanding (shares)	17,931,579	19,243,941
Less:
Unearned ESOP shares (shares)	0	(600,947)
Unvested restricted stock shares (shares)	(940)	(940)
Weighted average common shares outstanding (shares)	17,930,639	18,642,054
Add - Net effect of dilutive stock options and unvested restricted stock	461	5,462
Weighted average diluted common shares outstanding (shares)	17,931,100	18,647,516
Basic earnings per common share (usd per share)	$ 0.20	$ 0.10
Diluted earnings per common share (usd per share)	$ 0.20	$ 0.10

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Securities - Fair Value of Securites (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	$ 101,767	$ 92,876
Available for sale securities, accumulated gross unrealized gain before tax	457	536
Available for sale securities, accumulated gross unrealized loss before tax	(54)	(29)
Total Fair value	102,170	93,383
Certificates of deposit [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	86,340	75,916
Available for sale securities, accumulated gross unrealized gain before tax	0	0
Available for sale securities, accumulated gross unrealized loss before tax	0	0
Total Fair value	86,340	75,916
Equity mutual fund [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost		500
Available for sale securities, accumulated gross unrealized gain before tax		0
Available for sale securities, accumulated gross unrealized loss before tax		(1)
Total Fair value	491	499
Mortgage - backed securities - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	11,146	11,969
Available for sale securities, accumulated gross unrealized gain before tax	441	520
Available for sale securities, accumulated gross unrealized loss before tax	(43)	(17)
Total Fair value	11,544	12,472
Collateralized mortgage obligations - residential [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	4,272	4,481
Available for sale securities, accumulated gross unrealized gain before tax	16	16
Available for sale securities, accumulated gross unrealized loss before tax	(11)	(11)
Total Fair value	4,277	4,486
SBA-guaranteed loan participation certificates [Member]
Unrealized gains and losses recognized in accumulated other comprehensive income (loss)
Amortized Cost	9	10
Available for sale securities, accumulated gross unrealized gain before tax	0	0
Available for sale securities, accumulated gross unrealized loss before tax	0	0
Total Fair value	$ 9	$ 10

XML

Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized cost and fair values of securities
Due in one year or less, amortized cost	$ 86,340
Due in one year or less, fair value	86,340
Total amortized cost	101,767	$ 92,876
Total Fair value	102,170	93,383
Equity mutual fund [Member]
Amortized cost and fair values of securities
Total amortized cost		500
Total Fair value	491	499
Mortgage - backed securities - residential [Member]
Amortized cost and fair values of securities
Total amortized cost	11,146	11,969
Total Fair value	11,544	12,472
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Total amortized cost	4,272	4,481
Total Fair value	4,277	4,486
SBA-guaranteed loan participation certificates [Member]
Amortized cost and fair values of securities
Total amortized cost	9	10
Total Fair value	$ 9	$ 10

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Securities - Proceeds and Gross Gains (Losses) From Sale of Securities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Proceeds and Gross Gains (Losses) from Sale of Securities [Abstract]
Gain on Sale of Securities, Net	$ 0

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Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	$ 0	$ 499
12 Months or More, Fair Value	3,094	3,232
Fair Value, Total	3,094	3,731
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	(1)
12 Months or More, Unrealized Loss	(54)	(28)
Unrealized Loss, Total	(54)	(29)
Mortgage Backed Securities Residential [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	0	0
12 Months or More, Fair Value	1,111	1,149
Fair Value, Total	1,111	1,149
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	0
12 Months or More, Unrealized Loss	(43)	(17)
Unrealized Loss, Total	(43)	(17)
Collateralized mortgage obligations - residential [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value	0	0
12 Months or More, Fair Value	1,983	2,083
Fair Value, Total	1,983	2,083
Unrealized loss of securities
Less than 12 Months, Unrealized Loss	0	0
12 Months or More, Unrealized Loss	(11)	(11)
Unrealized Loss, Total	$ (11)	(11)
Equity Funds [Member]
Amortized cost and fair values of securities
Less than 12 Months, Fair Value		499
12 Months or More, Fair Value		0
Fair Value, Total		499
Unrealized loss of securities
Less than 12 Months, Unrealized Loss		(1)
12 Months or More, Unrealized Loss		0
Unrealized Loss, Total		$ (1)

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Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Loans receivable
Total loans	$ 1,284,664	$ 1,321,751
Net deferred loan origination costs	1,230	1,266
Allowance for loan losses	(8,341)	(8,366)	$ (7,971)	$ (8,127)
Loans, net	1,277,553	1,314,651
One-to-four family residential real estate loans [Member]
Loans receivable
Total loans	92,056	97,814
Allowance for loan losses	(765)	(850)
Multi-family mortgage loans [Member]
Loans receivable
Total loans	578,144	588,383
Allowance for loan losses	(3,866)	(3,849)
Nonresidential real estate loans [Member]
Loans receivable
Total loans	163,856	169,971
Allowance for loan losses	(1,577)	(1,605)
Construction and land loans [Member]
Loans receivable
Total loans	1,328	1,358
Allowance for loan losses	(32)	(32)
Commercial loans [Member]
Loans receivable
Total loans	162,564	152,552
Allowance for loan losses	(1,441)	(1,357)
Commercial leases [Member]
Loans receivable
Total loans	285,222	310,076
Allowance for loan losses	(650)	(655)
Consumer loans [Member]
Loans receivable
Total loans	1,494	1,597
Allowance for loan losses	$ (10)	$ (18)

XML

Loans Receivable - Loan Origination and Risk Management (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 1,284,664	$ 1,321,751
Multi-family mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	578,144	588,383
Nonresidential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	163,856	169,971
Commercial leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, amount	$ 285,222	$ 310,076

XML

Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance for loan losses and the loans receivable by portfolio segment
Net deferred loan origination costs	$ 1,230	$ 1,266
Loans, net	$ 1,277,553	$ 1,314,651

XML

Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 8,366	$ 8,127
Loans charged off	97	339
Recoveries	330	22
Net charge-off	(233)	317
Provision for (recovery of) loan losses	(258)	161
Ending balance	8,341	7,971
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	850
Loans charged off	(97)	(171)
Recoveries	99	6
Ending balance	765
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,849
Loans charged off	0	(3)
Recoveries	8	11
Ending balance	3,866
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,605
Loans charged off	0	(165)
Ending balance	1,577
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	32
Ending balance	32
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,357
Recoveries	223	$ 5
Ending balance	1,441
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	655
Ending balance	650
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	18
Ending balance	$ 10

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Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 1,284,664	$ 1,321,751
Loans individually evaluated for impairment by class loans
Loan Balance		6,007
Recorded Investment		5,196
Partial Charge-off		806
Average Investment in Impaired Loans		5,059
Interest Income Recognized		238
Allowance for loan losses (With an allowance recorded)	0	0
Impaired Loan, Total	5,163
Recorded Investment, Total	4,506
Partial Charge-offs, Total	651
Average Investment in Impaired Loans, Total	4,954
Interest Income Recognized, Total	26
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,341	8,366
Net deferred loan origination costs	1,230	1,266
Loans and Leases Receivable, Allowance	8,341	8,366	$ 7,971	$ 8,127
Financing Receivable, Individually Evaluated for Impairment	4,523	5,214
Financing Receivable, Collectively Evaluated for Impairment	1,280,141	1,316,537
Loans, net	1,277,553	1,314,651
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	92,056	97,814
Loans individually evaluated for impairment by class loans
Loan Balance	4,211	5,049
Recorded Investment	3,556	4,248
Partial Charge-off	651	806
Average Investment in Impaired Loans	4,002	4,212
Interest Income Recognized	15	197
Allowance for loan losses (With an allowance recorded)	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	765	850
Loans and Leases Receivable, Allowance	765	850
Financing Receivable, Individually Evaluated for Impairment	3,576	4,265
Financing Receivable, Collectively Evaluated for Impairment	88,480	93,549
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	20,190	21,208
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	578,144	588,383
Loans individually evaluated for impairment by class loans
Loan Balance	952	958
Recorded Investment	950	948
Partial Charge-off	0	0
Average Investment in Impaired Loans	952	847
Interest Income Recognized	11	41
Allowance for loan losses (With an allowance recorded)	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,866	3,849
Loans and Leases Receivable, Allowance	3,866	3,849
Financing Receivable, Individually Evaluated for Impairment	947	949
Financing Receivable, Collectively Evaluated for Impairment	577,197	587,434
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	276,144	291,358
Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	302,000	297,025
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	163,856	169,971
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	1,577	1,605
Loans and Leases Receivable, Allowance	1,577	1,605
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	163,856	169,971
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,093	1,099
Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	235	259
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	48,111	40,901
Commercial loans - other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	99,170	102,616
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,494	1,597
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	10	18
Loans and Leases Receivable, Allowance	10	18
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	1,494	1,597
Construction And Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,328	1,358
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	32	32
Loans and Leases Receivable, Allowance	32	32
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	1,328	1,358
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	162,564	152,552
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	1,441	1,357
Loans and Leases Receivable, Allowance	1,441	1,357
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	162,564	152,552
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	285,222	310,076
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	650	655
Loans and Leases Receivable, Allowance	650	655
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	285,222	310,076
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 71,866	$ 76,606

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Loans Receivable - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Reserve For Uncollected Loan Interest	$ 76	$ 103
Unpaid Principal Balance	2,136	4,097
Recorded Investment	1,958	2,390
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	1,675	3,413
Recorded Investment	1,543	1,918
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	308
Recorded Investment	46	109
Loans Past Due Over 90 Days, still accruing	0	0
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	375	376
Recorded Investment	369	363
Loans Past Due Over 90 Days, still accruing	$ 0	$ 0

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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 7,962	$ 4,451
Recorded Investment, Loans Not Past Due	1,273,008	1,311,339
Recorded investment, total	1,280,970	1,315,790
Commercial Leases Investment Rated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1,879	934
Recorded Investment, Loans Not Past Due	185,386	207,747
Recorded investment, total	187,265	208,681
Commercial Loans Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	827	288
Recorded Investment, Loans Not Past Due	98,900	102,873
Recorded investment, total	99,727	103,161
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	22	0
Recorded Investment, Loans Not Past Due	1,481	1,605
Recorded investment, total	1,503	1,605
Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Loans Not Past Due	69,980	71,738
Recorded investment, total	69,980	71,738
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	44,939	40,237
Recorded investment, total	44,939	40,237
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	48,160	40,935
Recorded investment, total	48,160	40,935
Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	234	259
Recorded investment, total	234	259
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded Investment, Loans Not Past Due	1,096	1,103
Recorded investment, total	1,096	1,103
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	940	608
Recorded Investment, Loans Not Past Due	161,265	166,071
Recorded investment, total	162,205	166,679
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	299,725	296,440
Recorded investment, total	299,725	296,440
Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	539	536
Recorded Investment, Loans Not Past Due	273,950	287,171
Recorded investment, total	274,489	287,707
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	424	99
Recorded Investment, Loans Not Past Due	19,676	20,944
Recorded investment, total	20,100	21,043
One to Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	3,331	1,986
Recorded Investment, Loans Not Past Due	68,216	74,216
Recorded investment, total	71,547	76,202
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	5,750	2,098
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	1,727	934
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	572	288
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	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	940	608
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	268	172
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	368	10
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	1,875	86
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	497	102
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	255	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	22	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	152
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Wholesale Commercial Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Multi Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	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	10	3
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	58	99
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	1,715	2,251
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] | Construction 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	0	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	271	364
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	46	86
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	$ 1,398	$ 1,801

XML

Loans Receivable - Troubled Debt Restructuring (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
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
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
Allowance for Loan and Lease Losses [Member]
Troubled Debt Restructurings
Valuation Allowances and Reserves, Balance	$ 0	$ 0

XML

Loans Receivable - Modified Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Loans modified	$ 0	$ 133

XML

Loans Receivable - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 7,962	$ 4,451
Financing Receivable Credit Quality Indicators
Total loans	1,284,664	1,321,751
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,331	1,986
Financing Receivable Credit Quality Indicators
Total loans	92,056	97,814
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	71,866	76,606
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	424	99
Financing Receivable Credit Quality Indicators
Total loans	20,190	21,208
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	539	536
Financing Receivable Credit Quality Indicators
Total loans	578,144	588,383
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	276,144	291,358
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	302,000	297,025
Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	163,856	169,971
Construction loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	1,093	1,099
Land loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable Credit Quality Indicators
Total loans	235	259
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	48,111	40,901
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	44,526	39,923
Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans
Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	69,927	71,728
Commercial loans - other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	827	288
Financing Receivable Credit Quality Indicators
Total loans	99,170	102,616
Commercial Leases - Investment Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,879	934
Financing Receivable Credit Quality Indicators
Total loans	186,052	207,460
Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,494	1,597
Nonaccrual [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,955	2,391
Nonaccrual [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,539	1,914
Nonaccrual [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	46	109
Nonaccrual [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	370	368
Nonaccrual [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,991	2,922
Substandard [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	323	255
Substandard [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	39	40
Substandard [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	222	225
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	149	154
Substandard [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	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	2,258	2,248
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	0	0
Pass [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,275,074	1,311,910
Pass [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	70,004	74,437
Pass [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	20,105	21,059
Pass [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	275,552	290,765
Pass [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	302,000	297,025
Pass [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	163,707	169,817
Pass [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,093	1,099
Pass [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	235	259
Pass [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	43,467	36,373
Pass [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	44,526	39,923
Pass [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	67,669	69,480
Pass [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	99,170	102,616
Pass [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	186,052	207,460
Pass [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,494	1,597
Special Mention [Member]
Financing Receivable Credit Quality Indicators
Total loans	4,644	4,528
Special Mention [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	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	0	0
Special Mention [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	4,644	4,528
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	0	0
Special Mention [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	5,750	2,098
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	1,875	86
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	368	10
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	268	172
Financing Receivables, 30 to 59 Days Past Due [Member] | Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	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	572	288
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	$ 1,727	$ 934

XML

Loans Receivable - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserve For Uncollected Loan Interest	$ 76,000		$ 103,000
Financing receivable modifications	17,000
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings	0		0
Loans modified	0	$ 133,000
Allowance for Loan and Lease Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation of reserves allocation	$ 0		$ 0

XML

Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans in Process of Foreclosure, Amount	$ 1,300		$ 1,500
Other Real Estate Owned At Carrying Value	1,802	$ 5,301	2,351	$ 3,895
Real Estate Owned, Valuation Allowance, Amounts Applied	(9)	(59)
Real Estate Owned, Valuation Allowance, Valuation Increase	25	20
Real Estate Owned, Valuation Allowance	(321)	(410)	(305)	$ (449)
Other Real Estate, Disposals	(1,086)	(510)
Other Real Estate, Valuation Adjustments	(25)	(20)
Other Real Estate, Additions	562	$ 1,936
Other real estate owned at carrying value before valuation allowance	2,123		2,656
Foreclosed Residential Real Estate [Member]
Real Estate Owned, Valuation Allowance			(352)
One to Four Family Residential Real Estate Loans [Member]
Other Real Estate Owned At Carrying Value	935		827
Real Estate Owned, Valuation Allowance	0		(9)
Other real estate owned at carrying value before valuation allowance	935		836
Nonresidential Real Estate [Member]
Other Real Estate Owned At Carrying Value	863		1,520
Real Estate Owned, Valuation Allowance	(277)		(252)
Other real estate owned at carrying value before valuation allowance	1,140		1,772
Land [Member]
Other Real Estate Owned At Carrying Value	4		4
Real Estate Owned, Valuation Allowance	(44)		(44)
Other real estate owned at carrying value before valuation allowance	$ 48		$ 48

XML

Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Available-for-sale Securities Pledged as Collateral	$ 3,300	$ 3,700
Carrying Value of Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Deposits Received for Securities Loaned	983	768
Federal Home Loan Bank Advances [Member] | Period One [Member]
Federal Home Loan Bank, Advances [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 60,000	$ 60,000

XML

Employee Benefit Plans - Employee Stock Ownership Plan (Details) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 29, 2017	Jun. 30, 2005	Mar. 31, 2018	Dec. 31, 2017
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
ESOP compensation expense			$ 1,100,000	$ 1,300,000
Loan receivable from ESOP		$ 19,600,000
ESOP issued price (usd per share)		$ 10
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated to participants (shares)			1,203,810	1,125,448
Distributed to participants			(317,914)	(313,223)
Unearned (shares)			0	831,852
Total ESOP shares (shares)	78,362		885,896	1,644,077
Fair value of unearned shares			$ 0	$ 12,328,000
Common Stock [Member]
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
Repayments of debt, shares issued (shares)	753,490
ESOP shares purchased (shares)		1,957,300
Share Acquisition Loan [Member]
Compensation Related Costs, Retirement and Share Based Payment [Line Items]
Loans payable			$ 0	$ 10,800,000

XML

Equity Incentive Plans - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 27, 2006	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding		0	1,752,156	1,752,156
Share-based compensation expense		$ 0	$ 979
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			1,752,156
Share-based Compensation Arrangement by Share-based Payment Award, Net Settlement Share Issuance		280,554
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		198,026
Share-based Compensation Arrangement by Share-based Payment Award, Shares Withheld For Taxes		82,528
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	3,425,275
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

XML

Equity Incentive Plans - Schedule of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Outstanding	0	1,752,156	1,752,156
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		5 months 23 days	1 year 5 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value			$ 778
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 0	$ 4,422
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		(1,752,156)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0

XML

Fair Value - Financial Assets Accounted for at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Company's financial instruments measured at fair values
Total Fair value	$ 102,170		$ 93,383
Real Estate Acquired Through Foreclosure Fair Value			916
Real Estate Owned, Valuation Allowance, Valuation Increase	25	$ 20
Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	86,340		75,916
Equity Funds [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	491		499
Residential Mortgage Backed Securities [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	11,544		12,472
Collateralized Debt Obligations [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	4,277		4,486
SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	9		10
Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	102,661		93,383
Real Estate Acquired Through Foreclosure Fair Value			916
Nonrecurring [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	86,340		75,916
Nonrecurring [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	491		499
Nonrecurring [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	11,544		12,472
Nonrecurring [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	4,277		4,486
Nonrecurring [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	9		10
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	491		499
Real Estate Acquired Through Foreclosure Fair Value			0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	102,170		92,884
Real Estate Acquired Through Foreclosure Fair Value			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Real Estate Acquired Through Foreclosure Fair Value	409		916
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity mutual fund [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed securities - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateralized mortgage obligations - residential [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | SBA-guaranteed loan participation certificates [Member]
Schedule of Company's financial instruments measured at fair values
Total Fair value	0		0
One to Four Family Residential Real Estate Loans [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			102
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			102
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			0
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			0
Commercial Real Estate [Member] | Nonrecurring [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	409		814
Commercial Real Estate [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		0
Commercial Real Estate [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		0
Commercial Real Estate [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value	$ 409
Nonresidential Real Estate Loans [Member]
Schedule of Company's financial instruments measured at fair values
Real Estate Acquired Through Foreclosure Fair Value			$ 814
Sales Comparison Valuation Technique [Member] | Commercial Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description	Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description	Comparison between sales and income approaches

XML

Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other Real Estate	$ 494,000		$ 1,200,000
Real Estate Owned, Valuation Allowance, Component	85,000		261,000
Fair Value, Other real estate owned			916,000
Other Real Estate Owned Write Downs	25,000	$ 20,000
One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			102,000
Nonresidential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			814,000
Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			916,000
Nonrecurring [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			102,000
Nonrecurring [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	409,000		814,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	0		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned			0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	409,000		$ 916,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value, Other real estate owned	$ 409,000
Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Processes, Description	Sales comparison
Fair Value Measurements, Sensitivity Analysis, Description	Comparison between sales and income approaches
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate			20.04%
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			4.58%
Maximum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			31.60%
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate			8.62%
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			(3.22%)
Minimum [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			5.74%
Weighted Average [Member] | impaired loans [Member] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments	3.60%		(10.20%)
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate			11.90%
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential Real Estate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			3.77%
Weighted Average [Member] | Real Estate [Domain] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments			25.20%

XML

Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 92,576	$ 127,592	$ 75,466	$ 96,684
Financial assets
Securities, carrying amount	102,170	93,383
Loans receivable, net of allowance for loan losses, carrying amounts	1,277,553	1,314,651
FHLBC stock, carrying amount	8,290	8,290
Accrued interest receivable, carrying amount	4,900	4,619
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	102,661	93,383
Loans Receivable, Fair Value Disclosure	1,276,635	1,323,139
Accounts Receivable, Fair Value Disclosure	4,900	4,619
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	92,576	127,592
Demand Deposit Accounts Fair Value Disclosure	232,593	234,354
Deposits Savings Deposits Fair Value Disclosure	160,093	160,501
Now Money Market Accounts		589,238
Now Money Market Accounts Fair Value Disclosure	573,886
Certificates Of Deposit Fair Value Disclosure	308,904	353,969
Short Term Borrowings Fair Value Disclosure	60,832	60,627
Accrued Liabilities, Fair Value Disclosure	180	147
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	10,613	13,572
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] | Level 2 [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	102,170	92,884
Loans Receivable, Fair Value Disclosure	1,276,635	1,323,139
Accounts Receivable, Fair Value Disclosure	4,900	4,619
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	81,963	114,020
Demand Deposit Accounts Fair Value Disclosure	232,593	234,354
Deposits Savings Deposits Fair Value Disclosure	160,093	160,501
Now Money Market Accounts		589,238
Now Money Market Accounts Fair Value Disclosure	573,886
Certificates of Deposit, at Carrying Value	308,904
Certificates Of Deposit Fair Value Disclosure		353,969
Short-term Debt	60,832	60,627
Accrued Liabilities, Fair Value Disclosure	180	147
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure		0
Reported Value Measurement [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	92,576	127,592
Financial assets
Securities, carrying amount	102,661	93,383
Loans receivable, net of allowance for loan losses, carrying amounts	1,277,553	1,314,651
FHLBC stock, carrying amount	8,290	8,290
Accrued interest receivable, carrying amount	4,900	4,619
Financial liabilities
Demand Deposit Accounts	232,593	234,354
Deposits, Savings Deposits	160,093	160,501
Now Money Market Accounts		589,238
Now Money Market Accounts Fair Value Disclosure	573,886
Certificates of Deposit, at Carrying Value	311,435	355,958
Short-term Debt	60,983	60,768
Accrued Interest Payable	180	147
Equity Funds [Member]
Financial assets
Securities, carrying amount	$ 491	$ 499

XML

Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue Recognition [Abstract]
Deposit service charges and fees	$ 978	$ 950
Loan fee income	70	60
Commercial mortgage brokerage fees	41	0
Residential mortgage banking fees	30	44
Trust and insurance commissions and annuities income	213	249
Earnings on bank owned life insurance	66	63
Other	141	178
Total noninterest income	1,539	1,544
Interchange income	$ 361	$ 350

XML

Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 23, 2018	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Bank owned life insurance				$ 22,925	$ 22,859
Scenario, Forecast [Member] | 15W060 North Frontage Road, Burr Ridge, Illinois [Member]
Subsequent Event [Line Items]
Gain (loss) on disposition of real estate		$ 100
Subsequent Event [Member]
Subsequent Event [Line Items]
Bank owned life insurance			$ 1,400
Subsequent Event [Member] | 15W060 North Frontage Road, Burr Ridge, Illinois [Member]
Subsequent Event [Line Items]
Sales price	$ 6,000