Investment Securities - Portfolio of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	$ 113,623	$ 116,792
Gross Unrealized Gains	2,217	1,404
Gross Unrealized Losses	209	498
Fair Value	115,631	117,698
Obligations of state and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	43,430	43,737
Gross Unrealized Gains	935	697
Gross Unrealized Losses	4	6
Fair Value	44,361	44,428
GSE mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	53,423	55,696
Gross Unrealized Gains	1,256	705
Gross Unrealized Losses	12	131
Fair Value	54,667	56,270
Collateralized mortgage obligations: residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	10,429	10,803
Gross Unrealized Gains	0	0
Gross Unrealized Losses	193	361
Fair Value	10,236	10,442
Collateralized mortgage obligations: commercial
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	6,341	6,556
Gross Unrealized Gains	26	2
Gross Unrealized Losses	0	0
Fair Value	$ 6,367	$ 6,558