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Derivative Financial Instruments - Fair Value Hedges (Details) - Interest rate swaps - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Net gains and losses recognized in income related to derivatives in fair value hedging relationships          
Net losses recognized on fair value hedges $ (67) $ (360) $ (243) $ (666)  
Minimum | Fair value hedges          
Fair hedges carried          
Fixed interest rate (as a percent) 2.59%   2.59%    
Maximum | Fair value hedges          
Fair hedges carried          
Fixed interest rate (as a percent) 5.38%   5.38%    
Net interest income | Fair value hedges          
Net gains and losses recognized in income related to derivatives in fair value hedging relationships          
Losses recorded $ (171) (297) $ (369) (694)  
Noninterest income          
Net gains and losses recognized in income related to derivatives in fair value hedging relationships          
Recognized on derivatives (95) (530) 124 (1,518)  
Recognized on hedged item 199 467 2 1,546  
Net gains recognized on fair value hedges (ineffective portion) 104 $ (63) 126 $ 28  
Derivatives designated as hedging instruments          
Fair hedges carried          
Notional amounts 196,451   196,451   $ 200,504
Derivatives designated as hedging instruments | Fair value hedges          
Fair hedges carried          
Notional amounts 46,500   46,500   50,500
Positive fair value 0   0   0
Fair value losses $ 1,200   $ 1,200   $ 1,500