Subsequent Events (Detail) (USD $)	0 Months Ended
	Oct. 05, 2013 Branches
Subsequent Event [Line Items]
Subsequent Event Date	Oct. 04, 2013
Branch Consolidations	13
Future Branch Consolidations	1
Branch Consolidation Incurred Costs	$ 7,200,000
Costs Relating To Shortened Useful Life Of Premises And Equipment	2,700,000
Contract Termination Costs	4,500,000
Minimum [Member]
Subsequent Event [Line Items]
Gross Cash Payments Expected	7,000,000
Maximum [Member]
Subsequent Event [Line Items]
Gross Cash Payments Expected	$ 9,000,000