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Fair Value Measurements - Estimated fair value of company's financial instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Federal funds sold $ 69,809 $ 20,391
Interest bearing deposits with other banks 47,131 1,680,945
Investment securities available-for-sale 1,649,753 2,623,408
Investment securities, held-to-maturity, estimated fair value 989,001 0
Federal Reserve and Federal Home Loan Bank stock 42,311 34,153
Interest bearing deposits 964,567 777,255
Customer repurchase agreements 21,465 23,918
Fair Value, Inputs, Level 2 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 3 47
Carrying Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 27,235 12,886
Federal funds sold 69,809 20,391
Interest bearing deposits with other banks 47,131 1,680,945
Investment securities available-for-sale 1,649,753 2,623,408
Investment securities, held-to-maturity, estimated fair value 1,114,084  
Federal Reserve and Federal Home Loan Bank stock   34,153
Loans held for sale 9,387 47,218
Loans 7,228,731 7,065,598
Noninterest bearing deposits 2,928,774 3,277,956
Interest bearing deposits 5,185,335 5,974,502
Time deposits 649,241 729,082
Customer repurchase agreements 21,465 23,918
Borrowings 584,763 369,670
Carrying Value | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 259 636
Derivative liability 115  
Carrying Value | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 3 47
Carrying Value | Interest rate derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 30,635 5,197
Derivative liability 29,492 5,147
Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 27,235 12,886
Federal funds sold 69,809 20,391
Interest bearing deposits with other banks 47,131 1,680,945
Investment securities available-for-sale 1,649,753 2,623,408
Investment securities, held-to-maturity, estimated fair value 989,001  
Federal Reserve and Federal Home Loan Bank stock   34,153
Loans held for sale 9,387 47,218
Loans 7,117,321 6,930,929
Noninterest bearing deposits 2,928,774 3,277,956
Interest bearing deposits 5,185,335 5,974,502
Time deposits 639,069 736,001
Customer repurchase agreements 21,465 23,918
Borrowings 583,416 374,326
Fair Value | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 259 636
Derivative liability 115  
Fair Value | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 3 47
Fair Value | Interest rate derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 30,635 5,197
Derivative liability 29,492 5,147
Fair Value | Fair Value, Inputs, Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 27,235 12,886
Federal funds sold 0 0
Interest bearing deposits with other banks 0 0
Investment securities available-for-sale 0 0
Investment securities, held-to-maturity, estimated fair value 0  
Federal Reserve and Federal Home Loan Bank stock   0
Loans held for sale 0 0
Loans 0 0
Noninterest bearing deposits 0 0
Interest bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Borrowings 0 0
Fair Value | Fair Value, Inputs, Level 1 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0  
Fair Value | Fair Value, Inputs, Level 1 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 0 0
Federal funds sold 69,809 20,391
Interest bearing deposits with other banks 47,131 1,680,945
Investment securities available-for-sale 1,649,753 2,611,408
Investment securities, held-to-maturity, estimated fair value 977,001  
Federal Reserve and Federal Home Loan Bank stock   34,153
Loans held for sale 9,387 47,218
Loans 0 0
Noninterest bearing deposits 2,928,774 3,277,956
Interest bearing deposits 5,185,335 5,974,502
Time deposits 639,069 736,001
Customer repurchase agreements 21,465 23,918
Borrowings 583,416 374,326
Fair Value | Fair Value, Inputs, Level 2 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0  
Fair Value | Fair Value, Inputs, Level 2 | Interest rate derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 30,635 5,197
Derivative liability 29,492 5,147
Fair Value | Fair Value, Inputs, Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 0 0
Federal funds sold 0 0
Interest bearing deposits with other banks 0 0
Investment securities available-for-sale 0 12,000
Investment securities, held-to-maturity, estimated fair value 12,000  
Federal Reserve and Federal Home Loan Bank stock   0
Loans held for sale 0 0
Loans 7,117,321 6,930,929
Noninterest bearing deposits 0 0
Interest bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Borrowings 0 0
Fair Value | Fair Value, Inputs, Level 3 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 259 636
Derivative liability 115  
Fair Value | Fair Value, Inputs, Level 3 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 3 | Interest rate derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability $ 0 $ 0