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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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