Securities - HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
HTM, Amortized Cost, Rolling Maturities
Due in one year or less	$ 26,360
Due after one year through five years	18,060
Due after five years through ten years	3,185
Due after ten years	63,742
Total	111,347
Amortized cost	310,478	$ 332,022
HTM, Fair Value, Rolling Maturities
Due in one year or less	26,364
Due after one year through five years	18,228
Due after five years through ten years	3,223
Due after ten years	63,951
Total	111,766
Fair Value	313,553	331,468
Residential mortgage-backed securities
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	23,099
Amortized cost	23,099	23,735
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	23,733
Fair Value	23,733	24,046
Collateralized mortgage obligations
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	157,455
Amortized cost	157,455	167,541
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	158,944
Fair Value	158,944	$ 166,873
Commercial mortgage backed securities
HTM, Amortized Cost, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	18,577
HTM, Fair Value, Rolling Maturities
Mortgage-backed securities, collateralized mortgage obligations and commercial mortgage-backed securities	$ 19,110