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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	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 386,197	$ 332,942
Unrealized Gains	4,558	5,432
Unrealized Losses	(8,543)	(12,257)
Fair Value	382,212	326,117
U.S. Agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,173	34,604
Unrealized Gains	80	11
Unrealized Losses	(577)	(1,017)
Fair Value	31,676	33,598
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,867	55,822
Unrealized Losses	(6,433)	(9,685)
Fair Value	49,434	46,137
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,798	5,000
Unrealized Gains		109
Unrealized Losses	(144)
Fair Value	70,654	5,109
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	94,432	102,506
Unrealized Gains	427	470
Unrealized Losses	(734)	(857)
Fair Value	94,125	102,119
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	222	226
Unrealized Gains	13	19
Unrealized Losses		(6)
Fair Value	235	239
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	127,705	134,784
Unrealized Gains	4,038	4,823
Unrealized Losses	(655)	(692)
Fair Value	131,088	$ 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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