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Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 103,607	$ 98,204	$ 92,195	$ 127,592
Financial assets
Securities, carrying amount	87,080	88,179
Loans receivable, net of allowance for loan losses, carrying amounts	1,267,454	1,323,793
FHLBC stock, carrying amount	7,490	8,026
Accrued interest receivable, carrying amount	5,417	4,952
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Securities, carrying amount	87,080	88,179
Loans Receivable, Fair Value Disclosure	1,272,269	1,315,855
Accounts Receivable, Fair Value Disclosure	5,417	4,952
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	103,607	98,204
Demand Deposit Accounts Fair Value Disclosure	213,966	230,041
Deposits Savings Deposits Fair Value Disclosure	153,414	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	525,346
Certificates Of Deposit Fair Value Disclosure	438,349	436,598
Short Term Borrowings Fair Value Disclosure	798	21,050
Accrued Liabilities, Fair Value Disclosure	154	291
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure		0
Accounts Receivable, Fair Value Disclosure		0
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	13,998	13,805
Demand Deposit Accounts Fair Value Disclosure		0
Deposits Savings Deposits Fair Value Disclosure		0
Certificates Of Deposit Fair Value Disclosure		0
Short Term Borrowings Fair Value Disclosure		0
Accrued Liabilities, Fair Value Disclosure		0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Securities, carrying amount	87,080	88,179
Loans Receivable, Fair Value Disclosure	0	0
Accounts Receivable, Fair Value Disclosure		249
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	89,609	84,399
Demand Deposit Accounts Fair Value Disclosure	213,966	230,041
Deposits Savings Deposits Fair Value Disclosure	153,414	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	525,346
Certificates of Deposit, at Carrying Value	438,349
Certificates Of Deposit Fair Value Disclosure		436,598
Short-term Debt	798	21,050
Accrued Liabilities, Fair Value Disclosure	154	291
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure	1,272,269	1,315,855
Accounts Receivable, Fair Value Disclosure	5,153	4,703
Reported Value Measurement [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	103,607	98,204
Financial assets
Securities, carrying amount	87,080	88,179
FHLBC stock, carrying amount	7,490	8,026
Accrued interest receivable, carrying amount	264	4,952
Financial liabilities
Demand Deposit Accounts	213,966	230,041
Deposits, Savings Deposits	153,414	152,334
Now Money Market Accounts		531,781
Now Money Market Accounts Fair Value Disclosure	525,346
Certificates of Deposit, at Carrying Value	437,481	438,328
Short-term Debt	798	21,049
Accrued Interest Payable	154	291
Equity Funds [Member]
Financial assets
Securities, carrying amount	$ 0	$ 0

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