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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	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 345,408	$ 372,389
Available for sale, Unrealized Gains	5,694	4,355
Available for sale, Unrealized Losses	(12,633)	(10,571)
Available for sale, Fair Value	338,469	366,173
U.S. Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	30,737	31,414
Available for sale, Unrealized Gains	89	39
Available for sale, Unrealized Losses	(257)	(751)
Available for sale, Fair Value	30,569	30,702
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	55,897	55,882
Available for sale, Unrealized Losses	(11,809)	(8,050)
Available for sale, Fair Value	44,088	47,832
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	70,343	70,571
Available for sale, Unrealized Losses	(92)	(238)
Available for sale, Fair Value	70,251	70,333
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	65,778	84,576
Available for sale, Unrealized Gains	282	155
Available for sale, Unrealized Losses	(416)	(1,175)
Available for sale, Fair Value	65,644	83,556
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	66	66
Available for sale, Unrealized Gains	6	6
Available for sale, Fair Value	72	72
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	122,587	124,880
Available for sale, Unrealized Gains	5,317	4,155
Available for sale, Unrealized Losses	(59)	(357)
Available for sale, Fair Value	$ 127,845	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
-Subparagraph (b)
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+ References

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+ References

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