Investment Securities - Summary of Investment Security Carrying and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 897	$ 899
Gross Unrealized Gains	0	23
Gross Unrealized Losses	1	0
Fair Value	896	922
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	270,070	331,812
Gross Unrealized Gains	1,028	520
Gross Unrealized Losses	747	1,113
Fair Value	270,351	331,219
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	209,745	264,267
Gross Unrealized Gains	63	150
Gross Unrealized Losses	708	1,056
Fair Value	209,100	263,361
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,266	18,184
Gross Unrealized Gains	128	26
Gross Unrealized Losses	28	53
Fair Value	17,366	18,157
U.S. Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		2
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,638	44,437
Gross Unrealized Gains	444	295
Gross Unrealized Losses	0	0
Fair Value	35,082	44,732
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000
Gross Unrealized Gains	2
Gross Unrealized Losses	0
Fair Value	3,002
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,421	4,922
Gross Unrealized Gains	391	49
Gross Unrealized Losses	11	4
Fair Value	5,801	4,967
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	897	899
Gross Unrealized Gains	0	23
Gross Unrealized Losses	1	0
Fair Value	$ 896	$ 922

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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