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Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets: |  |
Cash and due from banks | $ 53,295 | $ 38,565
Interest earning deposits with financial institutions | 228,040 | 713,542
Securities available-for-sale | 1,734,416 | 1,693,632
FHLBC and FRBC Stock | 20,413 | 13,257
Mortgage servicing rights | 10,722 | 7,097
Financial liabilities: |  |
Noninterest bearing deposits | 2,078,272 | 2,093,494
Junior subordinated debentures | 25,773 | 25,773
Senior notes | 44,533 | 44,480
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash and due from banks | 53,295 | 38,565
Interest earning deposits with financial institutions | 228,040 | 713,542
Securities available-for-sale | 1,734,416 | 1,693,632
FHLBC and FRBC Stock | 20,413 | 13,257
Loans held for sale | 1,707 | 4,737
Credit card portfolio, reported in other assets | 4,956 |
Net loans | 3,579,682 | 3,376,523
Mortgage servicing rights | 10,722 | 7,097
Interest rate swap agreements | 2,770 | 3,494
Interests rate lock commitments and forward contracts | 153 | 508
Interest receivable on securities and loans | 16,495 | 13,431
Financial liabilities: |  |
Noninterest bearing deposits | 2,078,272 | 2,093,494
Interest bearing deposits | 3,264,583 | 3,372,738
Securities sold under repurchase agreements | 37,599 | 50,377
Junior subordinated debentures | 25,773 | 25,773
Subordinated debentures | 59,254 | 59,212
Senior notes | 44,533 | 44,480
Note payable and other borrowings | 11,000 | 19,074
Interest rate swap agreements | 3,576 | 6,788
Interest payable on deposits and borrowings | 1,359 | 1,706
Estimate of Fair Value Measurement [Member] |  |
Financial assets: |  |
Cash and due from banks | 53,295 | 38,565
Interest earning deposits with financial institutions | 228,040 | 713,542
Securities available-for-sale | 1,734,416 | 1,693,632
FHLBC and FRBC Stock | 20,413 | 13,257
Loans held for sale | 1,707 | 4,737
Credit card portfolio, reported in other assets | 4,956 |
Net loans | 3,491,324 | 3,407,596
Mortgage servicing rights | 10,722 | 7,097
Interest rate swap agreements | 2,770 | 3,494
Interests rate lock commitments and forward contracts | 153 | 508
Interest receivable on securities and loans | 16,495 | 13,431
Financial liabilities: |  |
Noninterest bearing deposits | 2,078,272 | 2,093,494
Interest bearing deposits | 3,254,995 | 3,375,930
Securities sold under repurchase agreements | 37,599 | 50,377
Junior subordinated debentures | 22,938 | 18,557
Subordinated debentures | 55,054 | 60,111
Senior notes | 44,465 | 44,480
Note payable and other borrowings | 10,950 | 19,411
Interest rate swap agreements | 3,576 | 6,788
Interest payable on deposits and borrowings | 1,359 | 1,706
Fair Value, Inputs, Level 1 [Member] |  |
Financial assets: |  |
Cash and due from banks | 53,295 | 38,565
Interest earning deposits with financial institutions | 228,040 | 713,542
Securities available-for-sale | 214,820 | 202,339
Financial liabilities: |  |
Noninterest bearing deposits | 2,078,272 | 2,093,494
Senior notes | 44,465 | 44,480
Fair Value, Inputs, Level 2 [Member] |  |
Financial assets: |  |
Securities available-for-sale | 1,506,508 | 1,476,057
FHLBC and FRBC Stock | 20,413 | 13,257
Loans held for sale | 1,707 | 4,737
Credit card portfolio, reported in other assets | 4,956 |
Interest rate swap agreements | 2,770 | 3,494
Interests rate lock commitments and forward contracts | 153 | 508
Interest receivable on securities and loans | 16,495 | 13,431
Financial liabilities: |  |
Interest bearing deposits | 3,254,995 | 3,375,930
Securities sold under repurchase agreements | 37,599 | 50,377
Junior subordinated debentures | 22,938 | 18,557
Subordinated debentures | 55,054 | 60,111
Note payable and other borrowings | 10,950 | 19,411
Interest rate swap agreements | 3,576 | 6,788
Interest payable on deposits and borrowings | 1,359 | 1,706
Fair Value, Inputs, Level 3 [Member] |  |
Financial assets: |  |
Securities available-for-sale | 13,088 | 15,236
Net loans | 3,491,324 | 3,407,596
Mortgage servicing rights | $ 10,722 | $ 7,097

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