Investment Securities - Summary of Unrealized Losses 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, Securities with losses under 12 months, Fair Value	$ 13,226	$ 31,802
Held-to-maturity, Securities with losses under 12 months, Gross Unrealized Loss	158	362
Held-to-maturity, Securities with losses over 12 months, Fair Value	8,332	8,645
Held-to-maturity, Securities with losses over 12 months, Gross Unrealized Loss	273	323
Held-to-maturity, Total, Fair Value	21,558	40,447
Held-to-maturity, Total, Gross Unrealized Loss	431	685
Obligations of state and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Securities with losses under 12 months, Fair Value	4,249	8,054
Held-to-maturity, Securities with losses under 12 months, Gross Unrealized Loss	6	39
Held-to-maturity, Securities with losses over 12 months, Fair Value	0	0
Held-to-maturity, Securities with losses over 12 months, Gross Unrealized Loss	0	0
Held-to-maturity, Total, Fair Value	4,249	8,054
Held-to-maturity, Total, Gross Unrealized Loss	6	39
GSE mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Securities with losses under 12 months, Fair Value	5,694	19,408
Held-to-maturity, Securities with losses under 12 months, Gross Unrealized Loss	140	311
Held-to-maturity, Securities with losses over 12 months, Fair Value	0	0
Held-to-maturity, Securities with losses over 12 months, Gross Unrealized Loss	0	0
Held-to-maturity, Total, Fair Value	5,694	19,408
Held-to-maturity, Total, Gross Unrealized Loss	140	311
Collateralized mortgage obligations: residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Securities with losses under 12 months, Fair Value	0	0
Held-to-maturity, Securities with losses under 12 months, Gross Unrealized Loss	0	0
Held-to-maturity, Securities with losses over 12 months, Fair Value	8,332	8,645
Held-to-maturity, Securities with losses over 12 months, Gross Unrealized Loss	273	323
Held-to-maturity, Total, Fair Value	8,332	8,645
Held-to-maturity, Total, Gross Unrealized Loss	273	323
Collateralized mortgage obligations: commercial
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity, Securities with losses under 12 months, Fair Value	3,283	4,340
Held-to-maturity, Securities with losses under 12 months, Gross Unrealized Loss	12	12
Held-to-maturity, Securities with losses over 12 months, Fair Value	0	0
Held-to-maturity, Securities with losses over 12 months, Gross Unrealized Loss	0	0
Held-to-maturity, Total, Fair Value	3,283	4,340
Held-to-maturity, Total, Gross Unrealized Loss	$ 12	$ 12