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Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Cash and due from banks	$ 26,705	$ 24,306
Interest earning deposits with financial institutions	492,548	305,597
Securities available-for-sale	715,188	496,178
FHLBC and FRBC Stock	9,917	9,917
Bank-owned life insurance	64,265	63,102
Mortgage servicing rights	5,320	4,224
Financial liabilities:
Noninterest bearing deposits	1,037,638	909,505
Junior subordinated debentures	25,773	25,773
Senior notes	44,454	44,375
Reported Value Measurement [Member]
Financial assets:
Cash and due from banks	26,705	24,306
Interest earning deposits with financial institutions	492,548	305,597
Securities available-for-sale	715,188	496,178
FHLBC and FRBC Stock	9,917	9,917
Loans held for sale	3,009	12,611
Net loans	1,840,993	2,000,996
Mortgage servicing rights	5,320	4,224
Interest rate swap agreements	5,292	9,388
Interest rate lock commitments and forward contracts	875	840
Interest receivable on securities and loans	8,956	9,698
Financial liabilities:
Noninterest bearing deposits	1,037,638	909,505
Interest bearing deposits	1,676,691	1,627,568
Securities sold under repurchase agreements	42,962	66,980
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,190
Senior notes	44,454	44,375
Note payable and other borrowings	20,155	23,393
Interest rate swap agreements	7,767	13,071
Interest payable on deposits and borrowings	1,920	418
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and due from banks	26,705	24,306
Interest earning deposits with financial institutions	492,548	305,597
Securities available-for-sale	715,188	496,178
FHLBC and FRBC Stock	9,917	9,917
Loans held for sale	3,009	12,611
Net loans	1,849,933	2,009,773
Mortgage servicing rights	5,320	4,224
Interest rate swap agreements	5,292	9,388
Interest rate lock commitments and forward contracts	875	840
Interest receivable on securities and loans	8,956	9,698
Financial liabilities:
Noninterest bearing deposits	1,037,638	909,505
Interest bearing deposits	1,677,796	1,630,109
Securities sold under repurchase agreements	42,962	66,980
Junior subordinated debentures	18,557	14,658
Subordinated debentures	60,390
Senior notes	44,724	44,600
Note payable and other borrowings	20,600	24,043
Interest rate swap agreements	7,767	13,071
Interest payable on deposits and borrowings	1,920	418
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	26,705	24,306
Interest earning deposits with financial institutions	492,548	305,597
Securities available-for-sale	4,070	4,117
Financial liabilities:
Noninterest bearing deposits	1,037,638	909,505
Senior notes	44,724	44,600
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available-for-sale	705,558	487,742
FHLBC and FRBC Stock	9,917	9,917
Loans held for sale	3,009	12,611
Interest rate swap agreements	5,292	9,388
Interest rate lock commitments and forward contracts	875	840
Interest receivable on securities and loans	8,956	9,698
Financial liabilities:
Interest bearing deposits	1,677,796	1,630,109
Securities sold under repurchase agreements	42,962	66,980
Junior subordinated debentures	18,557	14,658
Subordinated debentures	60,390
Note payable and other borrowings	20,600	24,043
Interest rate swap agreements	7,767	13,071
Interest payable on deposits and borrowings	1,920	418
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Securities available-for-sale	5,560	4,319
Net loans	1,849,933	2,009,773
Mortgage servicing rights	$ 5,320	$ 4,224

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