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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net $ 5,611,000 $ 2,824,000
Centrally Cleared Interest Rate Swap With Counterparty    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 0  
Derivatives variation margin 4,600,000  
Centrally Cleared Interest Rate Swap With Counterparty | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 24,400,000  
Derivative Asset, at Fair Value 0  
Centrally Cleared Interest Rate Swap With Counterparty | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 377,100,000  
Derivative liability, fair value 0  
Interest Rate Locks with Customers    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net 1,000,000 636,000
Interest Rate Locks with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 129,469,000 87,119,000
Derivative Assets, at Fair Value 1,059,000 863,000
Interest Rate Locks with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 8,957,000 18,239,000
Derivative Liabilities, at Fair Value (59,000) (227,000)
Forward Commitments    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net (179,000) 2,111,000
Forward Commitments | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 3,856,000 70,031,000
Derivative Assets, at Fair Value 34,000 2,223,000
Forward Commitments | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 100,808,000 19,964,000
Derivative Liabilities, at Fair Value (213,000) (112,000)
Interest Rate Swaps with Customers    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net 5,527,000 7,399,000
Interest Rate Swaps with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,316,548,000 876,744,000
Derivative Assets, at Fair Value 24,505,000 24,397,000
Interest Rate Swaps with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 716,634,000 583,060,000
Derivative Liabilities, at Fair Value (18,978,000) (16,998,000)
Interest Rate Swaps with Dealer Counterparties    
Derivatives, Fair Value [Line Items]    
Derivatives, at Fair Value, Net (823,000) (7,399,000)
Interest Rate Swaps with Dealer Counterparties | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 716,634,000 583,060,000
Derivative Assets, at Fair Value 18,941,000 16,998,000
Interest Rate Swaps with Dealer Counterparties | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,316,548,000 876,744,000
Derivative Liabilities, at Fair Value (19,764,000) (24,397,000)
Foreign Exchange Contracts with Customers    
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net 157,000 283,000
Foreign Exchange Contracts with Customers | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 4,852,000 11,674,000
Foreign Currency Contract, Asset, Fair Value 276,000 504,000
Foreign Exchange Contracts with Customers | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 5,914,000 4,659,000
Foreign Currency Contracts, Liability, Fair Value (119,000) (221,000)
Foreign Exchange Contracts with Correspondent Banks    
Derivatives, Fair Value [Line Items]    
Foreign Currency Contract, Fair Value, Net (71,000) (206,000)
Foreign Exchange Contracts with Correspondent Banks | Positive fair values    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 7,960,000 7,040,000
Foreign Currency Contract, Asset, Fair Value 184,000 241,000
Foreign Exchange Contracts with Correspondent Banks | Negative fair values    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 6,048,000 12,869,000
Foreign Currency Contracts, Liability, Fair Value $ (255,000) $ (447,000)