Investment Securities - Summary of Investment Security Carrying and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 899	$ 899
Gross Unrealized Gains	15	23
Gross Unrealized Losses	0	0
Fair Value	914	922
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	324,148	331,812
Gross Unrealized Gains	813	520
Gross Unrealized Losses	823	1,113
Fair Value	324,138	331,219
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	261,283	264,267
Gross Unrealized Gains	142	150
Gross Unrealized Losses	790	1,056
Fair Value	260,635	263,361
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,001	18,184
Gross Unrealized Gains	95	26
Gross Unrealized Losses	28	53
Fair Value	18,068	18,157
U.S. Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1	2
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1	2
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,442	44,437
Gross Unrealized Gains	414	295
Gross Unrealized Losses	0	0
Fair Value	39,856	44,732
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,421	4,922
Gross Unrealized Gains	162	49
Gross Unrealized Losses	5	4
Fair Value	5,578	4,967
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	899	899
Gross Unrealized Gains	15	23
Gross Unrealized Losses	0	0
Fair Value	$ 914	$ 922

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

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