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Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Fair Values of Financial Instruments
Proceeds from sales of FHLBC/FRBC stock	$ 6,875
Financial assets:
Cash and due from banks		$ 38,565	$ 24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Bank-owned life insurance		105,300	63,102
Mortgage servicing rights		7,097	4,224
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Junior subordinated debentures		25,773	25,773
Senior notes		44,480	44,375
States and political subdivisions
Financial assets:
Securities available-for-sale		256,465	249,259
Reported Value Measurement [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Net loans		3,377,667	2,000,996
Mortgage servicing rights		7,097	4,224
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Interest bearing deposits		4,038,177	1,627,568
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		25,773	25,773
Subordinated debentures		59,212	44,375
Senior notes		44,480
Note payable and other borrowings		19,074	23,393
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Net loans		3,408,199	2,009,773
Mortgage servicing rights		7,097	4,224
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Interest bearing deposits		4,041,369	1,630,109
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		18,557	14,658
Subordinated debentures		60,111	44,600
Senior notes		44,480
Note payable and other borrowings		19,411	24,043
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		202,339	4,117
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Subordinated debentures			44,600
Senior notes		44,480
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available-for-sale		1,476,057	487,742
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Interest bearing deposits		4,041,369	1,630,109
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		18,557	14,658
Subordinated debentures		60,111
Note payable and other borrowings		19,411	24,043
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Securities available-for-sale		14,092	4,319
Net loans		3,408,199	2,009,773
Mortgage servicing rights		7,097	4,224
Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Financial assets:
Securities available-for-sale		$ 14,100	$ 4,300

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