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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative [Line Items]      
Notional amount of derivatives $ 7,245,505   $ 6,010,689
Derivative instrument associated loans on deferrals, receivable amount 1,300    
Fair value liability 5,000   5,700
Credit risk-related contingent features, net liability position 47,600   12,900
Credit risk-related contingent features, posted collateral 47,700   12,400
Derivatives Designated as Hedging Instruments [Member]      
Derivative [Line Items]      
Notional amount of derivatives 1,724,900   1,659,400
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]      
Derivative [Line Items]      
Amortization of accumulated other comprehensive loss on terminated cash flow hedges 1,100 $ 1,400  
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2021 [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 50,000    
Derivative maturity expiration year 2021    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 475,000    
Derivative maturity expiration year 2022    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 550,000    
Derivative maturity expiration year 2023    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2024 [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 100,000    
Derivative maturity expiration year 2024    
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 549,900   $ 441,400
Derivative hedged item 515,900    
Basis adjustment associated with hedged items 25,300    
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member]      
Derivative [Line Items]      
Amortized cost basis of closed portfolio of pre-payable securities $ 541,200