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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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