Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 331,812	$ 291,759
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Within 1 year, amortized cost	49,997
1-5 years, amortized cost	214,270
Amortized Cost	264,267	238,116
Within 1 year, fair value	50,041
1-5 years, fair value	213,320
Fair Value	$ 263,361
Within 1 year, weighted average yield	0.96%
1-5 years, weighted average yield	1.25%
Weighted Average Yield	1.20%
U.S. Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
1-5 years, amortized cost	$ 2
Amortized Cost	2	818
1-5 years, fair value	2
Fair Value	$ 2
1-5 years, weighted average yield	(5.90%)
Weighted Average Yield	(5.90%)
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Within 1 year, amortized cost	$ 9,793
1-5 years, amortized cost	26,208
5-10 years, amortized cost	8,436
Amortized Cost	44,437	39,049
Within 1 year, fair value	9,806
1-5 years, fair value	26,370
5-10 years, fair value	8,556
Fair Value	$ 44,732
Within 1 year, weighted average yield	1.60%
1-5 years, weighted average yield	1.67%
5-10 years, weighted average yield	2.14%
Weighted Average Yield	1.74%
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Over 10 years, amortized cost	$ 4,922
Amortized Cost	4,922	$ 3,549
Over 10 years, fair value	4,967
Fair Value	$ 4,967
Over 10 years, weighted average yield	6.41%
Weighted Average Yield	6.41%