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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0  
Within one year, estimated fair value 0  
After one year through five years, amortized cost 2,754  
After one year through five years, estimated fair value 2,874  
After five years through ten years, amortized cost 14,275  
After five years through ten years, estimated fair value 14,272  
After ten years, amortized cost 48,810  
After ten years, estimated fair value 48,968  
Total securities with single maturity date, amortized cost 65,839  
Total securities with single maturity date, estimated fair value 66,114  
Debt securities, amortized cost 445,098  
Available-for-sale debt securities 434,697 $ 535,281
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 22,728  
Investment securities not due at a single maturity date, estimated fair value 22,243  
Debt securities, amortized cost 22,728 65,994
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 250,331  
Investment securities not due at a single maturity date, estimated fair value 243,948  
Debt securities, amortized cost 250,331 237,210
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 106,200  
Investment securities not due at a single maturity date, estimated fair value 102,392  
Debt securities, amortized cost $ 106,200 $ 91,033