CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 221,039	$ 227,526
Investment securities	21,232	18,857
Securities purchased under resale agreements	4,314	4,270
Investment in Federal Home Loan Bank stock	220	233
Investment in Federal Reserve Bank stock	713	709
Short-term investments	6,532	2,740
Total interest and dividend income	254,050	254,335
INTEREST EXPENSE
Customer deposit accounts	20,164	25,982
Federal funds purchased	2
Federal Home Loan Bank advances	2,142	5,778
Securities sold under repurchase agreements	11,722	12,017
Long-term debt	1,102	1,571
Other borrowings		153
Total interest expense	35,132	45,501
Net interest income before provision for loan losses	218,918	208,834
Provision for loan losses	18,100	26,506
Net interest income after provision for loan losses	200,818	182,328
NONINTEREST INCOME
Impairment loss on investment securities	(5,165)	(5,555)
Less: Noncredit-related impairment loss recorded in other comprehensive income	5,066	5,091
Net impairment loss on investment securities recognized in earnings	(99)	(464)
Decrease in FDIC indemnification asset and receivable	(5,418)	(17,443)
Branch fees	8,294	7,754
Net gain on sales of investment securities	483	2,515
Letters of credit fees and commissions	4,275	3,044
Foreign exchange income	1,796	1,927
Ancillary loan fees	2,008	1,991
Income from life insurance policies	990	984
Net gain on sales of loans	5,179	7,410
Other operating income	4,232	3,323
Total noninterest income	21,740	11,041
NONINTEREST EXPENSE
Compensation and employee benefits	46,409	38,270
Occupancy and equipment expense	13,518	12,598
Amortization of investments in affordable housing partnerships and other investments	4,466	4,525
Amortization of premiums on deposits acquired	2,873	3,185
Deposit insurance premiums and regulatory assessments	3,992	7,191
Loan-related expenses	4,481	3,099
Other real estate owned expense	10,865	10,664
Legal expense	7,173	4,101
Prepayment penalty for FHLB advances	1,321	4,022
Data processing	2,464	2,603
Deposit-related expenses	1,427	1,159
Consulting expense	1,467	1,626
Other operating expenses	14,307	13,746
Total noninterest expense	114,763	106,789
INCOME BEFORE PROVISION FOR INCOME TAXES	107,795	86,580
PROVISION FOR INCOME TAXES	39,712	30,509
NET INCOME	68,083	56,071
PREFERRED STOCK DIVIDENDS	1,714	1,715
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 66,369	$ 54,356
EARNINGS PER SHARE AVAILABLE TO COMMON STOCKHOLDERS
BASIC (in dollars per share)	$ 0.46	$ 0.37
DILUTED (in dollars per share)	$ 0.45	$ 0.37
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	145,347	146,837
DILUTED (in shares)	151,996	153,334
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.10	$ 0.01