Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Held-to-maturity, Amortized Cost
Due after 3 months or less	$ 879
Due after 3 months through one year	1,353
Due after one through five years	5,554
Due after five through ten years	13,990
Due after ten years	71,742
Agency mortgage-backed securities	15,793
Total	109,311	$ 95,362
Held-to-maturity, Estimated Fair Value
Due less than 3 months	882
Due after 3 months through one year	1,362
Due after one through five years	5,626
Due after five through ten years	14,608
Due after ten years	71,694
Agency mortgage-backed securities	15,649
Estimated Fair Value	$ 109,821	$ 94,953