Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Debt Securities (Details) - Municipal securities $ in Thousands	Dec. 31, 2016 USD ($)
Schedule Of Debt Securities [Line Items]
Within 1 year, amortized cost	$ 4,325
1-5 years, amortized cost	13,267
5-10 years, amortized cost	1,491
Amortized Cost	19,083
Within 1 year, fair value	4,323
1-5 years, fair value	13,278
5-10 years, fair value	1,478
Fair Value	$ 19,079
Within 1 year, weighted average yield	1.34%
1-5 years, weighted average yield	2.32%
5-10 years, weighted average yield	4.78%
Weighted Average Yield	2.29%