Other Real Estate Owned (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
OREO activity
Balance, beginning of year	$ 17,509	$ 34,267	$ 23,496	$ 38,092
Additions	2,830	2,097	3,915	4,131
Sales	(2,994)	(13,217)	(8,404)	(18,907)
Valuation adjustments	(77)	(934)	(1,739)	(1,103)
Balance, end of year	17,268	22,213	17,268	22,213
OREO Valuation Allowances	3,300		3,300		$ 7,400
Non-Covered OREO
OREO activity
Balance, beginning of year	5,957	9,412	10,736	12,611
Additions		110		111
Sales		(5,253)	(4,779)	(8,439)
Valuation adjustments				(14)
Balance, end of year	5,957	4,269	5,957	4,269
Residential mortgage loans in process of foreclosure			7,200
Covered OREO
OREO activity
Balance, beginning of year	11,552	24,855	12,760	25,481
Additions	2,830	1,987	3,915	4,020
Sales	(2,994)	(7,964)	(3,625)	(10,468)
Valuation adjustments	(77)	(934)	(1,739)	(1,089)
Balance, end of year	$ 11,311	$ 17,944	$ 11,311	$ 17,944
FDIC reimbursement (as a percent)			80.00%
Payable to FDIC (as a percent)			80.00%