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Junior Subordinated Debentures - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 25, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 46,500,000 | $ 46,500,000 |
Accrued interest payable |  | 3,677,000 | 3,484,000 |
Other non-interest expense |  | 11,034,000 | 9,501,000 | $ 7,824,000
Metropolitan Statutory Trust 1 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 35,000,000 | $ 35,000,000 |
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual rate |  | 4.69% | 5.58% |
Accrued interest payable |  | $ 71,000 | $ 84,000 |
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-month LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread |  | 2.79% | 2.79% |
RidgeStone Capital Trust I |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,500,000 | $ 1,500,000 |
RidgeStone Capital Trust I | Junior Subordinated Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual rate |  | 6.38% | 6.38% |
Accrued interest payable |  | $ 0 | $ 0 |
RidgeStone Capital Trust I | Junior Subordinated Debentures | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other non-interest expense | $ 112,000 |  |  |
RidgeStone Capital Trust I | Junior Subordinated Debentures | Five-year LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread |  | 3.50% | 3.50% |
First Evanston Bancorp Trust I |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 10,000,000 | $ 10,000,000 |
First Evanston Bancorp Trust I | Junior Subordinated Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual rate |  | 3.67% | 4.57% |
Accrued interest payable |  | $ 17,000 | $ 21,000 |
First Evanston Bancorp Trust I | Junior Subordinated Debentures | Three-month LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate spread |  | 1.78% | 1.78% |

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- Definition Junior subordinated debenture owed to unconsolidated subsidiary trust, including unamortized discount. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + 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 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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