Cash disbursement for consideration of the assets and liabilities sold (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
Schedule of Cash Flow, Supplemental [Line Items]
Loans held-for-sale, at lower of cost or fair value	$ 178,008,000	[1]	$ 110,426,000
Deposits	24,466,105,000		26,711,145,000
Segment, Discontinued Operations [Member]
Schedule of Cash Flow, Supplemental [Line Items]
Loans held-for-sale, at lower of cost or fair value	1,099,673,000
Disposal Group Including Discontinued Operation Property Plant And Equipment Net	8,596,000
Disposal Group Including Discontinued Operation Other Assets	11,284,000
Deposits	1,089,046,000
Disposal Group Including Discontinued Operation Other Liabilities	17,716,000
Liabilities Of Disposal Group Including Discontinued Operation	1,106,762,000		0
Segment, Discontinued Operations [Member] | Sale Of Illinois And Central Florida Regional Operations [Member]
Schedule of Cash Flow, Supplemental [Line Items]
Loans held-for-sale, at lower of cost or fair value	660,891,000
Disposal Group Including Discontinued Operation Property Plant And Equipment Net	8,440,000
Disposal Group Including Discontinued Operation Other Assets	9,021,000
Deposits	(938,758,000)
Disposal Group Including Discontinued Operation Other Liabilities	(1,586,000)
Liabilities Of Disposal Group Including Discontinued Operation	$ (261,992,000)

[1] Loans held-for-sale from discontinued operations are presented as part of "Assets from Discontinued Operations" in the Consolidated Statement of Condition. Refer to Note 3 to the consolidated financial statements for further information on the discontinued operations.