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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Financial assets:    
Cash and due from banks $ 63,298 $ 55,534
Interest earning deposits with financial institutions 52,469 44,611
Securities available-for-sale 1,190,854 1,192,829
FHLBC and FRBC Stock 30,205 33,355
Mortgage servicing rights 9,726 10,344
Financial liabilities:    
Noninterest bearing deposits 1,669,000 1,834,891
Other short-term borrowings 335,000 405,000
Junior subordinated debentures 25,773 25,773
Reported Value Measurement    
Financial assets:    
Cash and due from banks 63,298 55,534
Interest earning deposits with financial institutions 52,469 44,611
Securities available-for-sale 1,190,854 1,192,829
FHLBC and FRBC Stock 30,205 33,355
Loans held for sale 2,447 1,322
Net loans 3,991,078 3,998,689
Mortgage servicing rights 9,726 10,344
Interest rate swap and rate cap agreements 4,499 5,302
Interest rate lock commitments and forward contracts 70  
Interest receivable on securities and loans 26,682 27,159
Financial liabilities:    
Noninterest bearing deposits 1,669,000 1,834,891
Interest bearing deposits 2,796,424 2,735,855
Securities sold under repurchase agreements 53,866 26,470
Other short-term borrowings 335,000 405,000
Junior subordinated debentures 25,773 25,773
Subordinated debentures 59,446 59,382
Interest rate swap and rate cap agreements 4,375 8,234
Interest rate lock commitments and forward contracts   10
Interest payable on deposits and borrowings 4,275 2,962
Estimate of Fair Value Measurement    
Financial assets:    
Cash and due from banks 63,298 55,534
Interest earning deposits with financial institutions 52,469 44,611
Securities available-for-sale 1,190,854 1,192,829
FHLBC and FRBC Stock 30,205 33,355
Loans held for sale 2,447 1,322
Net loans 3,914,124 3,876,381
Mortgage servicing rights 9,726 10,344
Interest rate swap and rate cap agreements 4,499 5,302
Interest rate lock commitments and forward contracts 70  
Interest receivable on securities and loans 26,682 27,159
Financial liabilities:    
Noninterest bearing deposits 1,669,000 1,834,891
Interest bearing deposits 2,790,377 2,726,223
Securities sold under repurchase agreements 53,866 26,470
Other short-term borrowings 335,000 405,000
Junior subordinated debentures 21,316 20,361
Subordinated debentures 52,154 47,982
Interest rate swap and rate cap agreements 4,375 8,324
Interest rate lock commitments and forward contracts   10
Interest payable on deposits and borrowings 4,275 2,962
Fair Value, Inputs, Level 1    
Financial assets:    
Cash and due from banks 63,298 55,534
Interest earning deposits with financial institutions 52,469 44,611
Securities available-for-sale 194,188 169,574
Financial liabilities:    
Noninterest bearing deposits 1,669,000 1,834,891
Fair Value, Inputs, Level 2    
Financial assets:    
Securities available-for-sale 980,498 1,007,926
FHLBC and FRBC Stock 30,205 33,355
Loans held for sale 2,447 1,322
Interest rate swap and rate cap agreements 4,499 5,302
Interest rate lock commitments and forward contracts 70  
Interest receivable on securities and loans 26,682 27,159
Financial liabilities:    
Interest bearing deposits 2,790,377 2,726,223
Securities sold under repurchase agreements 53,866 26,470
Other short-term borrowings 335,000 405,000
Junior subordinated debentures 21,316 20,361
Subordinated debentures 52,154 47,982
Interest rate swap and rate cap agreements 4,375 8,324
Interest rate lock commitments and forward contracts   10
Interest payable on deposits and borrowings 4,275 2,962
Fair Value, Inputs, Level 3    
Financial assets:    
Securities available-for-sale 16,168 15,329
Net loans 3,914,124 3,876,381
Mortgage servicing rights $ 9,726 $ 10,344