Investment Securities - Portfolio of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	$ 109,420	$ 116,792
Gross Unrealized Gains	2,919	1,404
Gross Unrealized Losses	66	498
Fair Value	112,273	117,698
Obligations of state and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	43,232	43,737
Gross Unrealized Gains	1,424	697
Gross Unrealized Losses	1	6
Fair Value	44,655	44,428
GSE mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	50,301	55,696
Gross Unrealized Gains	1,444	705
Gross Unrealized Losses	0	131
Fair Value	51,745	56,270
Collateralized mortgage obligations: residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	9,942	10,803
Gross Unrealized Gains	0	0
Gross Unrealized Losses	65	361
Fair Value	9,877	10,442
Collateralized mortgage obligations: commercial
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	5,945	6,556
Gross Unrealized Gains	51	2
Gross Unrealized Losses	0	0
Fair Value	$ 5,996	$ 6,558