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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 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	$ 113,321	$ 45,876
Available-for-Sale, Less than 12 Months, Unrealized Losses	(643)	(138)
Available-for-Sale, 12 Months or More, Fair Value	7,014	12,914
Available-for-Sale, 12 Months or More, Unrealized Losses	(170)	(241)
Held-to-Maturity, Less than 12 Months, Fair Value	30,666	538
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(333)	(2)
Held-to-Maturity, 12 Months or More, Fair Value	1,608	11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses	(38)	(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	80,061	24,459
Available-for-Sale, Less than 12 Months, Unrealized Losses	(396)	(67)
Available-for-Sale, 12 Months or More, Fair Value	7,014	7,630
Available-for-Sale, 12 Months or More, Unrealized Losses	(170)	(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	32,027	19,069
Available-for-Sale, Less than 12 Months, Unrealized Losses	(234)	(70)
Available-for-Sale, 12 Months or More, Fair Value		1,304
Available-for-Sale, 12 Months or More, Unrealized Losses		(23)
Held-to-Maturity, Less than 12 Months, Fair Value	14,823	538
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(130)	(2)
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	790
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1)
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	443	269
Available-for-Sale, Less than 12 Months, Unrealized Losses	(12)
Held-to-Maturity, Less than 12 Months, Fair Value	574
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(6)
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		1,999
Available-for-Sale, Less than 12 Months, Unrealized Losses		(1)
Held-to-Maturity, Less than 12 Months, Fair Value	15,269
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(197)
Held-to-Maturity, 12 Months or More, Fair Value	1,608	11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses	$ (38)	(52)
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

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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.

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