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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets    
Federal funds sold $ 9,610 $ 3,740
Interest-bearing deposits with other banks 584,491 709,897
Investment securities available-for-sale 1,433,006 1,506,388
Investment securities held-to-maturity 868,425 901,582
Federal Reserve and Federal Home Loan Bank stock 37,728 25,748
Bank owned life insurance 115,064 112,921
Liabilities    
Interest-bearing deposits 903,300 997,448
Customer repurchase agreements 32,040 30,587
Carrying Value    
Assets    
Cash and due from banks 16,383 9,047
Federal funds sold 9,610 3,740
Interest-bearing deposits with other banks 584,491 709,897
Investment securities available-for-sale 1,433,006 1,506,388
Investment securities held-to-maturity 961,925 1,015,737
Federal Reserve and Federal Home Loan Bank stock 37,728 25,748
Loans 7,970,269 7,968,695
Bank owned life insurance 115,064 112,921
Annuity investment 12,636 13,112
Accrued interest receivable 50,786 53,337
Liabilities    
Noninterest-bearing deposits 1,609,823 2,279,081
Interest-bearing deposits 4,220,119 4,311,491
Time deposits 2,710,908 2,217,467
Customer repurchase agreements 32,040 30,587
Other short-term borrowings 1,240,000 1,369,918
Long-term borrowings 75,812 0
Accrued interest payable 51,875 57,395
Carrying Value | Credit risk participation agreements    
Assets    
Derivative asset   3
Carrying Value | Interest rate product    
Assets    
Derivative asset 31,984 30,662
Liabilities    
Derivative liability 30,588 30,555
Fair Value    
Assets    
Cash and due from banks 16,383 9,047
Federal funds sold 9,610 3,740
Interest-bearing deposits with other banks 584,491 709,897
Investment securities available-for-sale 1,433,006 1,506,388
Investment securities held-to-maturity 868,425 901,582
Loans 7,649,112 7,720,241
Bank owned life insurance 115,064 112,921
Annuity investment 12,636 13,112
Accrued interest receivable 50,786 53,337
Liabilities    
Noninterest-bearing deposits 1,609,823 2,279,081
Interest-bearing deposits 4,220,119 4,311,491
Time deposits 2,727,075 2,217,795
Customer repurchase agreements 32,040 30,587
Other short-term borrowings 1,240,000 1,368,621
Long-term borrowings 82,399  
Accrued interest payable 51,875 57,395
Fair Value | Credit risk participation agreements    
Assets    
Derivative asset   3
Fair Value | Interest rate product    
Assets    
Derivative asset 31,984 30,662
Liabilities    
Derivative liability 30,588 30,555
Fair Value | ​Quoted Prices (Level 1)    
Assets    
Cash and due from banks 16,383 9,047
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 0 0
Federal Reserve and Federal Home Loan Bank stock 0 0
Loans 0 0
Bank owned life insurance 0 0
Annuity investment 0 0
Accrued interest receivable 50,786 53,337
Liabilities    
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Other short-term borrowings 0 0
Long-term borrowings 0
Accrued interest payable 51,875 57,395
Fair Value | ​Quoted Prices (Level 1) | Credit risk participation agreements    
Assets    
Derivative asset   0
Fair Value | ​Quoted Prices (Level 1) | Interest rate product    
Assets    
Derivative asset 0 0
Liabilities    
Derivative liability 0 0
Fair Value | Significant Other Observable Inputs (Level 2)    
Assets    
Cash and due from banks 0 0
Federal funds sold 9,610 3,740
Interest-bearing deposits with other banks 584,491 709,897
Investment securities available-for-sale 1,433,006 1,506,388
Investment securities held-to-maturity 868,425 901,582
Federal Reserve and Federal Home Loan Bank stock 0 0
Loans 0
Bank owned life insurance 115,064 112,921
Annuity investment 12,636 13,112
Accrued interest receivable 0 0
Liabilities    
Noninterest-bearing deposits 1,609,823 2,279,081
Interest-bearing deposits 4,220,119 4,311,491
Time deposits 2,727,075 2,217,795
Customer repurchase agreements 32,040 30,587
Other short-term borrowings 1,240,000 1,368,621
Long-term borrowings 0 0
Accrued interest payable 0 0
Fair Value | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements    
Assets    
Derivative asset   3
Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate product    
Assets    
Derivative asset 31,984 30,662
Liabilities    
Derivative liability 30,588 30,555
Fair Value | Significant Other Unobservable Inputs (Level 3)    
Assets    
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 0
Investment securities held-to-maturity 0 0
Federal Reserve and Federal Home Loan Bank stock 0 0
Loans 7,649,112 7,720,241
Bank owned life insurance 0 0
Annuity investment 0 0
Accrued interest receivable 0 0
Liabilities    
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Other short-term borrowings 0 0
Long-term borrowings 82,399 0
Accrued interest payable 0 0
Fair Value | Significant Other Unobservable Inputs (Level 3) | Credit risk participation agreements    
Assets    
Derivative asset   0
Fair Value | Significant Other Unobservable Inputs (Level 3) | Interest rate product    
Assets    
Derivative asset 0 0
Liabilities    
Derivative liability $ 0 $ 0