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Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Financial assets:
Cash and due from banks	$ 41,511	$ 38,565
Interest earning deposits with financial institutions	593,166	713,542
Securities available-for-sale	1,816,450	1,692,488
FHLBC and FRBC Stock	21,974	13,257
Bank-owned life insurance	105,424	105,300
Mortgage servicing rights	10,376	7,097
Financial liabilities:
Noninterest bearing deposits	1,461,712	1,428,055
Junior subordinated debentures	25,773	25,773
Senior notes	44,506	44,480
States and political subdivisions
Financial assets:
Securities available-for-sale	236,408	256,465
Reported Value Measurement [Member]
Financial assets:
Cash and due from banks	41,511	38,565
Interest earning deposits with financial institutions	593,166	713,542
Securities available-for-sale	1,816,450	1,692,488
FHLBC and FRBC Stock	21,974	13,257
Loans held for sale	8,075	4,737
Net loans	3,358,062	3,377,667
Mortgage servicing rights	10,376	7,097
Interest rate swap agreements	952	3,494
Interests rate lock commitments and forward contracts	930	508
Interest receivable on securities and loans	14,910	13,431
Financial liabilities:
Noninterest bearing deposits	1,461,712	1,428,055
Interest bearing deposits	4,083,013	4,038,177
Securities sold under repurchase agreements	33,521	50,377
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,233	59,212
Senior notes	44,506	44,480
Note payable and other borrowings	17,992	19,074
Interest rate swap agreements	3,657	6,788
Interest payable on deposits and borrowings	1,854	1,706
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and due from banks	41,511	38,565
Interest earning deposits with financial institutions	593,166	713,542
Securities available-for-sale	1,692,488	1,692,488
FHLBC and FRBC Stock	21,974	13,257
Loans held for sale	8,075	4,737
Net loans	3,386,123	3,408,199
Mortgage servicing rights	10,376	7,097
Interest rate swap agreements	952	3,494
Interests rate lock commitments and forward contracts	930	508
Interest receivable on securities and loans	14,910	13,431
Financial liabilities:
Noninterest bearing deposits	1,461,712	1,428,055
Interest bearing deposits	4,083,279	4,041,369
Securities sold under repurchase agreements	33,521	50,377
Junior subordinated debentures	23,711	18,557
Subordinated debentures	56,233	60,111
Senior notes	44,466	44,480
Note payable and other borrowings	18,034	19,411
Interest rate swap agreements	3,657	6,788
Interest payable on deposits and borrowings	1,854	1,706
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	41,511	38,565
Interest earning deposits with financial institutions	593,166	713,542
Securities available-for-sale	220,563	202,339
Financial liabilities:
Noninterest bearing deposits	1,461,712	1,428,055
Senior notes	44,466	44,480
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available-for-sale	1,582,054	1,476,057
FHLBC and FRBC Stock	21,974	13,257
Loans held for sale	8,075	4,737
Interest rate swap agreements	952	3,494
Interests rate lock commitments and forward contracts	930	508
Interest receivable on securities and loans	14,910	13,431
Financial liabilities:
Interest bearing deposits	4,083,279	4,041,369
Securities sold under repurchase agreements	33,521	50,377
Junior subordinated debentures	23,711	18,557
Subordinated debentures	56,233	60,111
Note payable and other borrowings	18,034	19,411
Interest rate swap agreements	3,657	6,788
Interest payable on deposits and borrowings	1,854	1,706
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Securities available-for-sale	13,833	14,092
Net loans	3,386,123	3,408,199
Mortgage servicing rights	10,376	$ 7,097
Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Financial assets:
Securities available-for-sale	$ 13,800		$ 4,600

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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