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Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Derivative asset, fair value $ 48,676 $ 41,636
Derivative, Collateral, Obligation to Return Securities 14,655 15,358
Derivative, Collateral, Obligation to Return Cash 0 0
Net Amount 34,021 26,278
Derivative liability, gross liability 43,388 41,842
Derivative liability, Collateral, Right to Reclaim Securities (14,655) (15,358)
Derivative liability, Collateral, Right to Reclaim Cash (18,320) (4,216)
Derivative liability, Net Amount 10,413 22,268
Interest Rate Swap [Member]    
Offsetting Assets [Line Items]    
Derivative asset, fair value 48,269 41,395
Derivative, Collateral, Obligation to Return Securities 14,372 15,117
Derivative, Collateral, Obligation to Return Cash 0 0
Net Amount 33,897 26,278
Derivative liability, gross liability 43,105 41,395
Derivative liability, Collateral, Right to Reclaim Securities (14,372) (15,117)
Derivative liability, Collateral, Right to Reclaim Cash (18,320) (4,010)
Derivative liability, Net Amount 10,413 22,268
Foreign Exchange Contract [Member]    
Offsetting Assets [Line Items]    
Derivative asset, fair value 407 241
Derivative, Collateral, Obligation to Return Securities 283 241
Derivative, Collateral, Obligation to Return Cash 0 0
Net Amount 124 0
Derivative liability, gross liability 283 447
Derivative liability, Collateral, Right to Reclaim Securities (283) (241)
Derivative liability, Collateral, Right to Reclaim Cash 0 (206)
Derivative liability, Net Amount $ 0 $ 0