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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Derivatives not designated as hedging instruments, fair value    
Derivatives $ 26,890,000 $ 26,343,000
Derivatives $ 24,961,000 $ 28,283,000
Asset Derivatives | 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 41
Derivative Asset, Notional Amount $ 184,644,000 $ 411,913,000
Derivative, Average Remaining Maturity 7 years 6 months 25 days 8 years 2 months 4 days
Derivatives $ 7,710,000 $ 26,343,000
Asset Derivatives | 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 79  
Derivative Asset, Notional Amount $ 626,825,000  
Derivative, Average Remaining Maturity 8 years 4 months 9 days  
Derivatives $ 17,201,000  
Asset Derivatives | Interest rate swap related to FHLB borrowings | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 11  
Derivative Asset, Notional Amount $ 109,400,000  
Derivative, Average Remaining Maturity 3 years 2 months 12 days  
Derivatives $ 1,979,000  
Liability Derivatives | Interest rate swap agreements on loans with commercial loan customers | Not Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative, Average Remaining Maturity 8 years 6 months 3 days 8 years 8 months 12 days
Derivative Liability, Number of Instruments Held 61 39
Derivative Liability, Notional Amount $ 442,181,000 $ 228,676,000
Derivatives $ 24,911,000 $ 6,595,000
Liability Derivatives | 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, Average Remaining Maturity   8 years 4 months 13 days
Derivative Liability, Number of Instruments Held   80
Derivative Liability, Notional Amount   $ 640,589,000
Derivatives   $ 19,748,000
Liability Derivatives | Interest rate swap related to FHLB borrowings | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative, Average Remaining Maturity   3 years 2 months 1 day
Derivative Liability, Number of Instruments Held   10
Derivative Liability, Notional Amount   $ 106,000,000
Derivatives   $ 1,940,000
Liability Derivatives | Interest rate swap related to AFS securities | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative, Average Remaining Maturity 10 years 10 days  
Derivative Liability, Number of Instruments Held 11  
Derivative Liability, Notional Amount $ 12,500,000  
Derivatives $ 50,000