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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 33,379  
Within one year, estimated fair value 33,331  
After one year through five years, amortized cost 1,857  
After one year through five years, estimated fair value 1,884  
After five years through ten years, amortized cost 24,181  
After five years through ten years, estimated fair value 24,333  
After ten years, amortized cost 104,067  
After ten years, estimated fair value 106,152  
Total securities with single maturity date, amortized cost 163,484  
Total securities with single maturity date, estimated fair value 165,700  
Amortized Cost 490,513  
Available-for-sale securities 484,001 $ 535,281
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Amortized Cost 32,741  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,228  
Investment securities not due at a single maturity date, estimated fair value 7,103  
Amortized Cost 7,228 65,994
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 227,027  
Investment securities not due at a single maturity date, estimated fair value 221,593  
Amortized Cost 227,027 237,210
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 92,774  
Investment securities not due at a single maturity date, estimated fair value 89,605  
Amortized Cost $ 92,774 $ 91,033