Securities - Contractural Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 17,130
Due after one year through five years	6,897
Due after five years through ten years	34,843
Due after ten years	4,820
Debt securities excluding securities not due at a single maturity date	63,690
Total	$ 470,719	$ 391,694
Securities Available-for-Sale, Weighted Average Yield
Due in one year or less (as a percent)	1.74%
Due after one year through five years (as a percent)	2.92%
Due after five years through ten years (as a percent)	2.39%
Due after ten years (as a percent)	3.21%
Debt securities (as a percent)	2.33%
Total (as a percent)	2.03%
Securities Available-for-Sale, Fair Value
Due in one year or less	$ 17,138
Due after one year through five years	6,959
Due after five years through ten years	34,171
Due after ten years	4,723
Debt securities	62,991
Fair Value	456,066	385,486
Securities Held-to-Maturity, Amortized Cost
Amortized Cost	247,746	259,670
Securities Held-to-Maturity, Fair Value
Fair Value	251,675	263,266
Collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	70,783
Total	$ 68,743	65,728
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.29%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 68,916
Fair Value	66,920	63,627
Securities Held-to-Maturity, Amortized Cost
Amortized Cost	211,241	222,545
Securities Held-to-Maturity, Fair Value
Fair Value	213,578	224,111
Asset-backed securities
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	241,872
Total	$ 241,872	175,565
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	1.47%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 231,908
Fair Value	231,908	173,496
Collateralized loan obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	94,374
Total	$ 94,374	94,236
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	3.06%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 92,251
Fair Value	$ 92,251	$ 92,209
Mortgage-backed and collateralized mortgage obligations
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.78%
Securities Held-to-Maturity, Amortized Cost
Amortized Cost	$ 247,746
Securities Held-to-Maturity, Fair Value
Fair Value	$ 251,675