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Amortized Cost and Aggregate Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 384,029	$ 332,942
Unrealized Gains	3,713	5,432
Unrealized Losses	(11,551)	(12,257)
Fair Value	376,191	326,117
U.S. Agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,082	34,604
Unrealized Gains	26	11
Unrealized Losses	(981)	(1,017)
Fair Value	32,127	33,598
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,852	55,822
Unrealized Losses	(7,507)	(9,685)
Fair Value	48,345	46,137
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	60,832	5,000
Unrealized Gains	12	109
Unrealized Losses	(136)
Fair Value	60,708	5,109
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97,902	102,506
Unrealized Gains	329	470
Unrealized Losses	(1,438)	(857)
Fair Value	96,793	102,119
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	222	226
Unrealized Gains	6	19
Unrealized Losses	(9)	(6)
Fair Value	219	239
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	131,139	134,784
Unrealized Gains	3,340	4,823
Unrealized Losses	(1,480)	(692)
Fair Value	132,999	$ 138,915
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000
Fair Value	$ 5,000

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

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