CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 217,159	$ 221,039
Investment securities	10,210	21,232
Securities purchased under resale agreements	5,529	4,314
Investment in Federal Home Loan Bank stock	529	220
Investment in Federal Reserve Bank stock	720	713
Due from banks and short-term investments	4,276	6,532
Total interest and dividend income	238,423	254,050
INTEREST EXPENSE
Customer deposit accounts	16,854	20,164
Federal funds purchased		2
Federal Home Loan Bank advances	1,039	2,142
Securities sold under repurchase agreements	10,529	11,722
Long-term debt	710	1,102
Total interest expense	29,132	35,132
Net interest income before provision for loan losses	209,291	218,918
(Reversal of) provision for loan losses, excluding covered loans	(762)	16,479
Provision for loan losses on covered loans	5,089	1,621
Net interest income after provision for loan losses	204,964	200,818
NONINTEREST (LOSS) INCOME
Impairment loss on investment securities		(5,165)
Less: Noncredit-related impairment loss recorded in other comprehensive income		5,066
Net impairment loss on investment securities recognized in earnings		(99)
Decrease in FDIC indemnification asset and receivable	(31,899)	(5,418)
Branch fees	7,654	7,662
Net gain on sales of investment securities	5,577	483
Letters of credit fees and commissions	5,062	4,275
Foreign exchange income	2,336	1,796
Ancillary loan fees	2,052	2,008
Income from life insurance policies	968	990
Net gain on sales of loans	94	5,179
Other operating income	6,057	4,864
Total noninterest (loss) income	(2,099)	21,740
NONINTEREST EXPENSE
Compensation and employee benefits	45,731	46,409
Occupancy and equipment expense	13,808	13,518
Amortization of investments in affordable housing partnerships and other investments	4,283	4,466
Amortization of premiums on deposits acquired	2,409	2,873
Deposit insurance premiums and regulatory assessments	3,782	3,992
Loan related expenses	3,584	4,481
Other real estate owned (gain on sale) expense	(984)	10,865
Legal expense	4,444	7,173
Prepayment penalty for FHLB advances		1,321
Data processing	2,437	2,464
Deposit related expenses	1,574	1,427
Consulting expense	454	1,467
Other operating expenses	14,833	14,307
Total noninterest expense	96,355	114,763
INCOME BEFORE PROVISION FOR INCOME TAXES	106,510	107,795
PROVISION FOR INCOME TAXES	34,419	39,712
NET INCOME	72,091	68,083
PREFERRED STOCK DIVIDENDS	1,714	1,714
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 70,377	$ 66,369
EARNINGS PER SHARE AVAILABLE TO COMMON STOCKHOLDERS
BASIC (in dollars per share)	$ 0.51	$ 0.46
DILUTED (in dollars per share)	$ 0.50	$ 0.45
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	137,648	145,347
DILUTED (in shares)	143,519	151,996
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.15	$ 0.10