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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net $ 14,378 $ 5,611
Centrally Cleared Interest Rate Swap With Counterparty    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Collateral, Obligation to Return Cash, Offset 14,300 4,600
Derivatives variation margin 9,700 4,600
Interest Rate Locks with Customers    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net 1,136 1,000
Interest Rate Locks with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 101,700 129,469
Derivative Assets, at Fair Value 1,148 1,059
Interest Rate Locks with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 1,646 8,957
Derivative Liabilities, at Fair Value (12) (59)
Forward Commitments    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net (1,063) (179)
Forward Commitments | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,540 3,856
Derivative Assets, at Fair Value 3 34
Forward Commitments | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 83,562 100,808
Derivative Liabilities, at Fair Value (1,066) (213)
Interest Rate Swaps with Customers    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net 2,489 5,527
Interest Rate Swaps with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,185,144 1,316,548
Derivative Assets, at Fair Value 33,258 24,505
Interest Rate Swaps with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,386,046 716,634
Derivative Liabilities, at Fair Value (30,769) (18,978)
Interest Rate Swaps with Dealer Counterparties    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net 11,805 (823)
Interest Rate Swaps with Dealer Counterparties | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,386,046 716,634
Derivative Assets, at Fair Value 28,143 18,941
Interest Rate Swaps with Dealer Counterparties | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,185,144 1,316,548
Derivative Liabilities, at Fair Value (16,338) (19,764)
Foreign Exchange Contracts with Customers    
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net (146) 157
Foreign Exchange Contracts with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 5,881 4,852
Foreign Currency Contract, Asset, Fair Value 105 276
Foreign Exchange Contracts with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 9,690 5,914
Foreign Currency Contracts, Liability, Fair Value (251) (119)
Foreign Exchange Contracts with Correspondent Banks    
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net 157 (71)
Foreign Exchange Contracts with Correspondent Banks | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 9,220 7,960
Foreign Currency Contract, Asset, Fair Value 287 184
Foreign Exchange Contracts with Correspondent Banks | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 6,831 6,048
Foreign Currency Contracts, Liability, Fair Value $ (130) $ (255)