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Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | $ (23) |
Fair value of mortgage servicing rights | $ 335 | 420 |
Financial assets |  |  |
Cash and cash equivalents, carrying amount | 190,325 | 98,204 | $ 127,592
Cash and Due from Banks | 9,785 | 13,805 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 180,540 | 84,399 |
Marketable Securities | 60,193 | 88,179 |
Securities, carrying amount | 60,193 | 88,179 |
Loans receivable, net of allowance for loan losses, carrying amounts | 1,168,008 | 1,323,793 |
FHLBC stock, carrying amount | 7,490 | 8,026 |
Accrued interest receivable, carrying amount | 4,563 | 4,952 |
Financial liabilities |  |  |
Noninterest-bearing demand deposits | 210,762 | 230,041 |
Savings deposits | 153,183 | 152,334 |
Time Deposits | 402,034 | 438,328 |
Borrowings | 61 | 21,049 |
Estimated Fair Value [Member] |  |  |
Financial assets |  |  |
Cash and cash equivalents, fair value | 190,325 | 98,204 |
Securities, carrying amount | 60,193 | 88,179 |
Loans receivable, net of allowance for loan losses, fair value | 1,177,459 | 1,315,855 |
Accounts interest receivable, fair value | 4,563 | 4,952 |
Financial liabilities |  |  |
Certificates of deposit, fair value | 402,914 | 436,598 |
Borrowings, fair value | 61 | 21,050 |
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 |  |  |
Certificates of deposit, fair value | 0 | 0 |
Borrowings, fair value | 0 | 0 |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 60,193 | 88,179 |
Loans receivable, net of allowance for loan losses, fair value | 0 | 0 |
Accounts interest receivable, fair value | 252 | 249 |
Financial liabilities |  |  |
Certificates of deposit, fair value | 402,914 | 436,598 |
Borrowings, fair value | 61 | 21,050 |
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 | 1,177,459 | 1,315,855 |
Accounts interest receivable, fair value | 4,311 | 4,703 |
Financial liabilities |  |  |
Certificates of deposit, fair value | 0 | 0 |
Borrowings, fair value | 0 | 0 |
Equity Funds [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 60,193 | 88,179 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 0 | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |
Financial assets |  |  |
Securities, carrying amount | 60,193 | 88,179 |
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 | 2,977 | 3,685 |
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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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530178&loc=d3e59706-112781 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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