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Securities - Carrying Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortized Cost    
Within one year $ 0  
One to five years 400  
Five to ten years 32,047  
After ten years 141,280  
Amortized Cost 173,727  
Amortized cost 430,070 $ 215,576
Fair Value    
Within one year 0  
One to five years 362  
Five to ten years 31,904  
After ten years 143,284  
Fair Value 175,550  
Fair Value 433,806 213,698
Mortgage-backed securities    
Amortized Cost    
Amortized cost 233,886 113,948
Fair Value    
Fair Value 235,911 113,052
Asset-backed securities    
Amortized Cost    
Amortized cost 19,457 19,444
Fair Value    
Fair Value 19,332 19,361
Other securities    
Amortized Cost    
Amortized cost 3,000 3,000
Fair Value    
Fair Value $ 3,013 $ 2,979