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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended					3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Purchased Credit Impaired	Mar. 31, 2013 Purchased Credit Impaired	Dec. 31, 2012 Purchased Credit Impaired	Mar. 31, 2014 Commercial Loans Purchased Credit Impaired	Mar. 31, 2013 Commercial Loans Purchased Credit Impaired	Dec. 31, 2012 Commercial Loans Purchased Credit Impaired	Mar. 31, 2014 Consumer Real Estate Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 24,077	$ 25,770	$ 755	$ 8	$ 8	$ 77	$ 8	$ 8	$ 678
Purchased impaired provision	1,590	1,142	(262)			(69)			(193)
Benefit attributable to FDIC indemnification asset	203		203			55			148
Provision for loan losses charged to operations	1,793	1,142	(59)			(14)			(45)
Provision for loan losses recorded through the FDIC indemnification asset	(1,793)	(1,142)	(203)			(55)			(148)
Ending balance	$ 23,798	$ 24,850	$ 493	$ 8	$ 8	$ 8	$ 8	$ 8	$ 485