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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%

X

- Definition

Junior subordinated debenture owed to unconsolidated subsidiary trust, including unamortized discount.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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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)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

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-Topic 942
-SubTopic 210
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Amount of noninterest expense classified as other.

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