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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Derivatives not designated as hedging instruments, fair value    
Derivatives $ 69,703,000 $ 55,597,000
Derivatives $ 61,133,000 $ 51,949,000
Interest rate swap agreements on loans with commercial loan customers | Not Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 18 25
Derivative Asset, Notional Amount $ 143,915,000 $ 249,454,000
Derivative Asset, Average Remaining Maturity 6 years 3 months 10 days 6 years 3 months 29 days
Derivatives $ 2,759,000 $ 7,904,000
Derivative Liability, Number of Instruments Held 86 81
Derivative Liability, Notional Amount $ 794,764,000 $ 689,702,000
Derivative Liability, Average Remaining Maturity 5 years 8 months 4 days 5 years 11 months 15 days
Derivatives $ 61,133,000 $ 51,138,000
Interest rate swap agreements on loans with third-party counter parties | Not Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 104 106
Derivative Asset, Notional Amount $ 938,679,000 $ 939,156,000
Derivative Asset, Average Remaining Maturity 5 years 9 months 7 days 6 years 21 days
Derivatives $ 58,374,000 $ 43,234,000
Interest rate swap related to AFS securities | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 11 11
Derivative Asset, Notional Amount $ 12,500,000 $ 12,500,000
Derivative Asset, Average Remaining Maturity 8 years 10 days 8 years 3 months 10 days
Derivatives $ 765,000 $ 624,000
Interest rate swap related to wholesale funding | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 37 9
Derivative Asset, Notional Amount $ 394,655,000 $ 96,400,000
Derivative Asset, Average Remaining Maturity 3 years 4 months 24 days 2 years 5 months 19 days
Derivatives $ 7,805,000 $ 3,835,000
Derivative Liability, Number of Instruments Held   29
Derivative Liability, Notional Amount   $ 306,255,000
Derivative Liability, Average Remaining Maturity   3 years 10 months 20 days
Derivatives   $ 811,000