Discontinued Operations - Assets and liabilities (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013	Sep. 30, 2013
Assets Of Disposal Group Including Discontinued Operation Abstract
Disposal Group Including Discontinued Operation Cash And Cash Equivalents	$ 9,500,000			$ 0
Loans held-for-sale	178,008,000	[1]	110,426,000
Liabilities Of Disposal Group Including Discontinued Operation Abstract
Deposits	24,466,105,000		26,711,145,000
Segment, Discontinued Operations [Member]
Assets Of Disposal Group Including Discontinued Operation Abstract
Disposal Group Including Discontinued Operation Cash And Cash Equivalents	9,500,000
Loans held-for-sale	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
Assets Of Disposal Group Including Discontinued Operation	1,129,053,000		0
Liabilities Of Disposal Group Including Discontinued Operation Abstract
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
Net Assets Or Liabilities Of Disposal Group Including Discontinued Operation	$ 22,291,000

[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.