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Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ (23) | $ (261) |
Fair value of mortgage servicing rights | 420 | 513 |
Financial assets |  |  |
Cash and cash equivalents, carrying amount | 98,204 | 127,592 | $ 96,684
Cash and Due from Banks | 13,805 | 13,572 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 84,399 | 114,020 |
Marketable Securities | 88,179 | 93,383 |
Securities, carrying amount | 88,179 | 93,383 |
Loans receivable, net of allowance for loan losses, carrying amounts | 1,323,793 | 1,314,651 |
FHLBC stock, carrying amount | 8,026 | 8,290 |
Accrued interest receivable, carrying amount | 4,952 | 4,619 |
Financial liabilities |  |  |
Noninterest-bearing demand deposits | 230,041 | 234,354 |
Savings deposits | 152,334 | 160,501 |
Time Deposits | 438,328 | 355,958 |
Borrowings | 21,049 | 60,768 |
Carrying Amount [Member] |  |  |
Financial liabilities |  |  |
NOW and money market accounts, carrying amount | 531,781 | 589,238 |
Accrued interest payable, carrying amount | 291 | 147 |
Estimated Fair Value [Member] |  |  |
Financial assets |  |  |
Cash and cash equivalents, fair value | 98,204 | 127,592 |
Securities, carrying amount | 88,179 | 93,383 |
Loans receivable, net of allowance for loan losses, fair value | 1,315,855 | 1,323,139 |
Accounts interest receivable, fair value | 4,952 | 4,619 |
Financial liabilities |  |  |
Non-interest-bearing demand deposits, fair value | 230,041 | 234,354 |
NOW money market accounts, fair value | 531,781 | 589,238 |
Savings deposits, fair value | 152,334 | 160,501 |
Certificates of deposit, fair value | 436,598 | 353,969 |
Borrowings, fair value | 21,050 | 60,627 |
Accrued interest payable, fair value | 291 | 147 |
Estimated Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Financial assets |  |  |
Loans receivable, net of allowance for loan losses, fair value | 0 | 0 |
Accounts interest receivable, fair value | 0 | 0 |
Financial liabilities |  |  |
Non-interest-bearing demand deposits, fair value | 0 | 0 |
Savings deposits, fair value | 0 | 0 |
Certificates of deposit, fair value | 0 | 0 |
Borrowings, fair value | 0 | 0 |
Accrued interest payable, fair value | 0 | 0 |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 88,179 | 92,884 |
Loans receivable, net of allowance for loan losses, fair value | 0 | 1,323,139 |
Accounts interest receivable, fair value | 249 | 4,619 |
Financial liabilities |  |  |
Non-interest-bearing demand deposits, fair value | 230,041 | 234,354 |
NOW money market accounts, fair value | 531,781 | 589,238 |
Savings deposits, fair value | 152,334 | 160,501 |
Certificates of deposit, fair value | 436,598 | 353,969 |
Borrowings, fair value | 21,050 | 60,627 |
Accrued interest payable, fair value | 291 | 147 |
Estimated Fair Value [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Financial assets |  |  |
Cash and cash equivalents, fair value | 0 | 0 |
Securities, carrying amount | 0 | 0 |
Loans receivable, net of allowance for loan losses, fair value | 1,315,855 | 0 |
Accounts interest receivable, fair value | 4,703 | 0 |
Financial liabilities |  |  |
Non-interest-bearing demand deposits, fair value | 0 | 0 |
Savings deposits, fair value | 0 | 0 |
Certificates of deposit, fair value | 0 | 0 |
Borrowings, fair value | 0 | 0 |
Accrued interest payable, fair value | 0 | 0 |
Equity Funds [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 0 | 499 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 88,179 | 93,383 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 0 | 499 |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 88,179 | 92,884 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Collateralized Mortgage Obligations Residential [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 3,685 | 4,486 |
Fair Value, Measurements, Nonrecurring [Member] | Collateralized Mortgage Obligations Residential [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Collateralized Mortgage Obligations Residential [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | $ 0 | $ 0 |

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