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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Cash and due from banks $ 53,099 $ 52,175
Interest earning deposits with financial institutions 63,426 47,154
Securities available-for-sale 1,157,480 1,161,701
FHLBC and FRBC Stock 28,282 19,441
Mortgage servicing rights 9,549 10,374
Financial liabilities:    
Noninterest bearing deposits 1,738,028 1,704,920
Other short-term borrowings 165,000 20,000
Junior subordinated debentures 25,774 25,773
Notes payable and other borrowings 14,812  
Reported Value Measurement    
Financial assets:    
Cash and due from banks 53,099 52,175
Interest earning deposits with financial institutions 63,426 47,154
Securities available-for-sale 1,157,480 1,161,701
FHLBC and FRBC Stock 28,282 19,441
Loans held for sale 1,463 1,556
Net loans 5,189,977 3,937,717
Mortgage servicing rights 9,549  
Interest rate swap and rate cap agreements 4,249 5,498
Interest rate lock commitments and forward contracts 69 55
Interest receivable on securities and loans 31,404 24,598
Financial liabilities:    
Noninterest bearing deposits 1,738,028 1,704,920
Interest bearing deposits 4,022,222 3,063,811
Securities sold under repurchase agreements 24,290 36,657
Other short-term borrowings 165,000 20,000
Junior subordinated debentures 25,774 25,773
Subordinated debentures 59,531 59,467
Notes payable and other borrowings 14,812  
Interest rate swap and rate cap agreements 1,369 3,187
Interest payable on deposits and borrowings 6,627 3,871
Estimate of Fair Value Measurement    
Financial assets:    
Cash and due from banks 53,099 52,175
Interest earning deposits with financial institutions 63,426 47,154
Securities available-for-sale 1,157,480 1,161,701
FHLBC and FRBC Stock 28,282 19,441
Loans held for sale 1,463 1,556
Net loans 5,136,839 3,818,303
Mortgage servicing rights 9,549  
Interest rate swap and rate cap agreements 4,249 5,498
Interest rate lock commitments and forward contracts 69 55
Interest receivable on securities and loans 31,404 24,598
Financial liabilities:    
Noninterest bearing deposits 1,738,028 1,704,920
Interest bearing deposits 4,015,267 3,056,180
Securities sold under repurchase agreements 24,290 36,657
Other short-term borrowings 165,000 20,000
Junior subordinated debentures 21,393 21,444
Subordinated debentures 55,069 54,533
Notes payable and other borrowings 15,018  
Interest rate swap and rate cap agreements 1,369 3,187
Interest payable on deposits and borrowings 6,627 3,871
Fair Value, Inputs, Level 1    
Financial assets:    
Cash and due from banks 53,099 52,175
Interest earning deposits with financial institutions 63,426 47,154
Securities available-for-sale 190,670 194,143
Financial liabilities:    
Noninterest bearing deposits 1,738,028 1,704,920
Fair Value, Inputs, Level 2    
Financial assets:    
Securities available-for-sale 950,769 952,408
FHLBC and FRBC Stock 28,282 19,441
Loans held for sale 1,463 1,556
Interest rate swap and rate cap agreements 4,249 5,498
Interest rate lock commitments and forward contracts 69 55
Interest receivable on securities and loans 31,404 24,598
Financial liabilities:    
Interest bearing deposits 4,015,267 3,056,180
Securities sold under repurchase agreements 24,290 36,657
Other short-term borrowings 165,000 20,000
Junior subordinated debentures 21,393 21,444
Subordinated debentures 55,069 54,533
Notes payable and other borrowings 15,018  
Interest rate swap and rate cap agreements 1,369 3,187
Interest payable on deposits and borrowings 6,627 3,871
Fair Value, Inputs, Level 3    
Financial assets:    
Securities available-for-sale 16,041 15,150
Net loans 5,136,839 $ 3,818,303
Mortgage servicing rights $ 9,549