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Fair Value Measurements and Fair Value of Financial Instruments, Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
AFS securities [Abstract]    
AFS securities $ 1,399,032 $ 1,527,225
Equity securities $ 35,600 30,784
Minimum [Member]    
Fair Value Measurements [Abstract]    
Liquidation expense ratio on impaired collateral 10.00%  
Maximum [Member]    
Fair Value Measurements [Abstract]    
Liquidation expense ratio on impaired collateral 50.00%  
U.S. Treasury [Member]    
AFS securities [Abstract]    
AFS securities $ 121,595 121,658
Federal Agency [Member]    
AFS securities [Abstract]    
AFS securities 203,756 206,419
State & Municipal [Member]    
AFS securities [Abstract]    
AFS securities 83,285 82,851
Corporate [Member]    
AFS securities [Abstract]    
AFS securities 41,217 54,240
Recurring Basis [Member]    
AFS securities [Abstract]    
AFS securities 1,399,032 1,527,225
Equity securities 35,600 30,784
Derivatives $ 113,140 $ 93,185
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Total $ 1,547,772 $ 1,651,194
Liabilities [Abstract]    
Derivatives $ 143,599 $ 117,257
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Total $ 143,599 $ 117,257
Recurring Basis [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 121,595 121,658
Equity securities 34,600 29,784
Derivatives 0 0
Total 156,195 151,442
Liabilities [Abstract]    
Derivatives 0 0
Total 0 0
Recurring Basis [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 1,277,437 1,405,567
Equity securities 1,000 1,000
Derivatives 113,140 93,185
Total 1,391,577 1,499,752
Liabilities [Abstract]    
Derivatives 143,599 117,257
Total 143,599 117,257
Recurring Basis [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Equity securities 0 0
Derivatives 0 0
Total 0 0
Liabilities [Abstract]    
Derivatives 0 0
Total 0 0
Recurring Basis [Member] | U.S. Treasury [Member]    
AFS securities [Abstract]    
AFS securities 121,595 121,658
Recurring Basis [Member] | U.S. Treasury [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 121,595 121,658
Recurring Basis [Member] | U.S. Treasury [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | U.S. Treasury [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Federal Agency [Member]    
AFS securities [Abstract]    
AFS securities 203,756 206,419
Recurring Basis [Member] | Federal Agency [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Federal Agency [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 203,756 206,419
Recurring Basis [Member] | Federal Agency [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | State & Municipal [Member]    
AFS securities [Abstract]    
AFS securities 83,285 82,851
Recurring Basis [Member] | State & Municipal [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | State & Municipal [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 83,285 82,851
Recurring Basis [Member] | State & Municipal [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Mortgage-Backed [Member]    
AFS securities [Abstract]    
AFS securities 415,768 473,694
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 415,768 473,694
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member]    
AFS securities [Abstract]    
AFS securities 533,411 588,363
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 533,411 588,363
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Corporate [Member]    
AFS securities [Abstract]    
AFS securities 41,217 54,240
Recurring Basis [Member] | Corporate [Member] | Level 1 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Recurring Basis [Member] | Corporate [Member] | Level 2 [Member]    
AFS securities [Abstract]    
AFS securities 41,217 54,240
Recurring Basis [Member] | Corporate [Member] | Level 3 [Member]    
AFS securities [Abstract]    
AFS securities 0 0
Non-Recurring Basis [Member]    
Fair Value Measurements [Abstract]    
Loans individually evaluated for expected credit losses, fair value $ 1,900 $ 1,100