Investment Securities - Summary of Interest Income On Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	$ 3,613	$ 3,073	$ 2,651
Total tax-exempt interest income	282	320	391
Total	3,895	3,393	3,042
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	2,661	2,378	1,769
U.S. Agency Mortgage-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	4	25	25
Other
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	948	670	857
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Total tax-exempt interest income	$ 282	$ 320	$ 391