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Investments - Transfers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Investment securities      
Unrealized holding gains at time of transfer retained in AOCI   $ 566 $ 3,283
Unrealized (gain) loss on securities      
Investment securities      
Unrealized holding gains at time of transfer retained in AOCI   5,100 $ 6,900
MBS and municipal securities      
Investment securities      
AFS securities transferred to held-to-maturity, book value $ 279,800    
AFS securities transferred to held-to-maturity, fair value $ 288,600    
Held to maturity securities      
Investment securities      
Unrealized holding gains at time of transfer retained in AOCI   $ 8,800