Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Tables)

12 Months Ended

Dec. 31, 2011

Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]

Schedule of Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings

	As of December 31,
	2011		2010
Federal funds purchased and securities sold under agreements to repurchase	$	866,265	$	777,585
Wholesale borrowings
FHLB advances	$	203,068	$	325,560
Other	394		447
Total wholesale borrowings	$	203,462	$	326,007

Schedule of Select Financial Data Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings

	As of December 31,
	2011			2010			2009
Federal funds purchased and securities sold under agreements to repurchase
Average balance during the year	$	925,803		$	907,015		$	1,013,167
Weighted-average annual interest rate during the year	0.36		%	0.49		%	0.47		%
Maximum month-end balance	$	1,014,720		$	1,034,200		$	1,350,475

Schedule of Select Financial Data Wholesale Borrowings [Table Text Block]

	As of December 31,
	2011			2010			2009
Wholesale borrowings
Average balance during the year	$	298,835		$	510,790		$	952,979
Weighted-average annual interest rate during the year	2.11		%	2.74		%	2.87		%
Maximum month-end balance	$	327,997		$	716,091		$	1,159,181

Schedule of Maturities of Federal Funds Purchasedand Securities Sold Under Agreements to Repurchase and Wholesale Borrowings

	One Year		One to		Three to		Over Five
	or Less		Three Years		Five Years		Years		Total
Wholesale Borrowings
FHLB advances	$	50,000	$	39,524	$	78,019	$	35,525	$	203,068
Other	57		123		139		75		394
Total wholesale borrowings	$	50,057	$	39,647	$	78,158	$	35,600	$	203,462