Accumulated Other Comprehensive Income - Summary of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (294)	$ 6,607
Reclassification for gains included in net income	1	(4)	(111)
Current year changes		4,421	(2,914)
Ending balance	3,582	4,123	3,582
Unrealized Gain (Loss) on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		1,397	(23)
Current year changes		(638)	1,204
Ending balance	1,181	759	1,181
Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,691)	6,630
Reclassification for gains included in net income		(4)	(111)
Current year changes		5,059	(4,118)
Ending balance	$ 2,401	$ 3,364	$ 2,401