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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 111,208	$ 45,876
Available-for-Sale, Less than 12 Months, Unrealized Losses	(751)	(138)
Available-for-Sale, 12 Months or More, Fair Value	17,979	12,914
Available-for-Sale, 12 Months or More, Unrealized Losses	(494)	(241)
Held-to-Maturity, Less than 12 Months, Fair Value	25,878	538
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(218)	(2)
Held-to-Maturity, 12 Months or More, Fair Value	1,560	11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses	(27)	(52)
Residential [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	83,403	24,459
Available-for-Sale, Less than 12 Months, Unrealized Losses	(458)	(67)
Available-for-Sale, 12 Months or More, Fair Value	9,061	7,630
Available-for-Sale, 12 Months or More, Unrealized Losses	(150)	(125)
Commercial [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	24,337	19,069
Available-for-Sale, Less than 12 Months, Unrealized Losses	(272)	(70)
Available-for-Sale, 12 Months or More, Fair Value	8,918	1,304
Available-for-Sale, 12 Months or More, Unrealized Losses	(344)	(23)
Held-to-Maturity, Less than 12 Months, Fair Value	14,143	538
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(170)	(2)
Obligations of U.S. Government Sponsored Agencies [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	1,982	1,999
Available-for-Sale, Less than 12 Months, Unrealized Losses	(17)	(1)
Held-to-Maturity, Less than 12 Months, Fair Value	11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(44)
Held-to-Maturity, 12 Months or More, Fair Value	1,560	11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses	(27)	(52)
Corporate Notes [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	779
Obligations of States and Political Subdivisions [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	707	269
Available-for-Sale, Less than 12 Months, Unrealized Losses	(4)
Held-to-Maturity, Less than 12 Months, Fair Value	572
Held-to-Maturity, Less than 12 Months, Unrealized Losses	$ (4)
U.S. Treasury Securities [Member]
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value		80
Available-for-Sale, 12 Months or More, Fair Value		3,980
Available-for-Sale, 12 Months or More, Unrealized Losses		$ (93)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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+ References

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

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+ References

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+ References

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