Securities - HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
HTM, Amortized Cost, Rolling Maturities
Due in one year or less	$ 26,668
Due after one year through five years	20,457
Due after five years through ten years	4,066
Due after ten years	70,897
Total	122,088
Amortized cost	332,022	$ 118,209
HTM, Fair Value, Rolling Maturities
Due in one year or less	26,639
Due after one year through five years	20,611
Due after five years through ten years	4,097
Due after ten years	70,609
Total	121,956
Held to maturity, fair value	331,468	118,345
Residential mortgage-backed securities
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	23,735
Amortized cost	23,735	29,782
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	24,046
Held to maturity, fair value	24,046	30,310
Collateralized mortgage obligations
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	167,541
Amortized cost	167,541	57,328
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	166,873
Held to maturity, fair value	166,873	$ 56,898
Commercial mortgage backed securities
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	18,658
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	$ 18,593