Investment Securities - Portfolio of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	$ 91,242	$ 98,211
Gross Unrealized Gains	956	735
Gross Unrealized Losses	431	685
Fair Value	91,767	98,261
Obligations of state and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	37,338	40,515
Gross Unrealized Gains	523	309
Gross Unrealized Losses	6	39
Fair Value	37,855	40,785
GSE mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	42,004	44,375
Gross Unrealized Gains	433	426
Gross Unrealized Losses	140	311
Fair Value	42,297	44,490
Collateralized mortgage obligations: residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	8,605	8,969
Gross Unrealized Gains	0	0
Gross Unrealized Losses	273	323
Fair Value	8,332	8,646
Collateralized mortgage obligations: commercial
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Amortized Cost	3,295	4,352
Gross Unrealized Gains	0	0
Gross Unrealized Losses	12	12
Fair Value	$ 3,283	$ 4,340