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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, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 325,430	$ 372,389
Available for sale, Unrealized Gains	6,696	4,355
Available for sale, Unrealized Losses	(9,427)	(10,571)
Available for sale, Fair Value	322,699	366,173
U.S. Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	29,938	31,414
Available for sale, Unrealized Gains	228	39
Available for sale, Unrealized Losses	(57)	(751)
Available for sale, Fair Value	30,109	30,702
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	55,912	55,882
Available for sale, Unrealized Losses	(9,246)	(8,050)
Available for sale, Fair Value	46,666	47,832
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	65,116	70,571
Available for sale, Unrealized Losses	(30)	(238)
Available for sale, Fair Value	65,086	70,333
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	52,829	84,576
Available for sale, Unrealized Gains	407	155
Available for sale, Unrealized Losses	(86)	(1,175)
Available for sale, Fair Value	53,150	83,556
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	55	66
Available for sale, Unrealized Gains	18	6
Available for sale, Fair Value	73	72
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	121,580	124,880
Available for sale, Unrealized Gains	6,043	4,155
Available for sale, Unrealized Losses	(8)	(357)
Available for sale, Fair Value	$ 127,615	128,678
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost		5,000
Available for sale, Fair Value		$ 5,000

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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