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Condensed Financial Information (Parent Company Only) - Condensed Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Condensed Consolidating Statement of Comprehensive Income [Line Items]
Net income	$ 4,948us-gaap_NetIncomeLoss	$ 4,958us-gaap_NetIncomeLoss	$ 4,778us-gaap_NetIncomeLoss	$ 3,417us-gaap_NetIncomeLoss	$ 4,115us-gaap_NetIncomeLoss	$ 4,785us-gaap_NetIncomeLoss	$ 5,665us-gaap_NetIncomeLoss	$ 5,311us-gaap_NetIncomeLoss	$ 18,101us-gaap_NetIncomeLoss	$ 19,876us-gaap_NetIncomeLoss	$ 19,543us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									(332)	1,734	(376)
Other Comprehensive Income (Loss), Net of Tax									3,250	(10,830)	1,259
Comprehensive Income									21,351us-gaap_ComprehensiveIncomeNetOfTax	9,046us-gaap_ComprehensiveIncomeNetOfTax	20,802us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member]
Schedule of Condensed Consolidating Statement of Comprehensive Income [Line Items]
Net income									18,101	19,876	19,543
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									(332)	1,734	(376)
Unrealized appreciation for the period on held-to-maturity securities, net of taxes									(209)
Unrealized appreciation (depreciation) on available-for-sale securities, net of taxes									4,432	(12,320)	1,636
Less: reclassification adjustment for realized gains included in net income, net of taxes									(642)	(244)	1
Other Comprehensive Income (Loss), Net of Tax									3,249	(10,830)	1,259
Comprehensive Income									$ 21,350	$ 9,046	$ 20,802