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Securities - Carrying Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Amortized Cost    
Within one year $ 0  
One to five years 298  
Five to ten years 36,851  
After ten years 165,146  
Amortized Cost 202,295  
Amortized cost 469,539 $ 215,576
Held-to-maturity securities, Five to ten years 5,500  
Held-to-maturity securities, Amortized Cost 5,500  
Fair Value    
Within one year 0  
One to five years 263  
Five to ten years 36,536  
After ten years 165,572  
Fair Value 202,371  
Fair Value 470,978 213,698
Held-to-maturity securities, Five to ten years 5,578  
Held-to-maturity securities, Fair Value 5,578  
Mortgage-backed securities    
Amortized Cost    
Amortized cost 244,780 113,948
Fair Value    
Fair Value 246,085 113,052
Asset-backed securities    
Amortized Cost    
Amortized cost 19,464 19,444
Fair Value    
Fair Value 19,496 19,361
Other securities    
Amortized Cost    
Amortized cost 3,000 3,000
Fair Value    
Fair Value $ 3,026 $ 2,979