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Amortized Cost and Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 166,450	$ 372,389
Available for sale, Unrealized Gains	2,345	4,355
Available for sale, Unrealized Losses	(3,216)	(10,571)
Available for sale, Fair Value	165,579	366,173
U.S. Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	1,342	31,414
Available for sale, Unrealized Gains	3	39
Available for sale, Unrealized Losses		(751)
Available for sale, Fair Value	1,345	30,702
Single Issue Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	22,104	55,882
Available for sale, Unrealized Losses	(2,165)	(8,050)
Available for sale, Fair Value	19,939	47,832
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost		70,571
Available for sale, Unrealized Losses		(238)
Available for sale, Fair Value		70,333
Mortgage-backed Agency securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	31,290	84,576
Available for sale, Unrealized Gains	66	155
Available for sale, Unrealized Losses	(465)	(1,175)
Available for sale, Fair Value	30,891	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	111,659	124,880
Available for sale, Unrealized Gains	2,258	4,155
Available for sale, Unrealized Losses	(586)	(357)
Available for sale, Fair Value	$ 113,331	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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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 320
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+ References

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