Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Debt Securities (Details) - Municipal securities $ in Thousands	Mar. 31, 2017 USD ($)
Schedule Of Debt Securities [Line Items]
Within 1 year, amortized cost	$ 3,421
1-5 years, amortized cost	13,988
5-10 years, amortized cost	1,491
Amortized Cost	18,900
Within 1 year, fair value	3,420
1-5 years, fair value	14,083
5-10 years, fair value	1,479
Fair Value	$ 18,982
Within 1 year, weighted average yield	1.49%
1-5 years, weighted average yield	2.27%
5-10 years, weighted average yield	4.78%
Weighted Average Yield	2.33%