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Derivative Instruments and Hedging Activities (Fair Values of Derivative Instruments on the Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount $ 50,000 $ 100,000
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives 647  
Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 803,852 353,145
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset derivatives 23,999 6,551
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives 23,558 6,745
Cash Flow Hedging [Member] | Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 50,000 100,000
Cash Flow Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives 647  
Cash Flow Hedging [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 100,000  
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 575,707 272,962
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset derivatives 23,079 6,419
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives 23,498 6,720
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 87,393 68,324
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset derivatives 29 13
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives 47 18
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 40,752 11,859
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset derivatives 891 119
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ 13 $ 7