CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 945,530	$ 945,798	$ 998,589
Investment securities	58,184	89,469	70,052
Securities purchased under resale agreements	20,392	19,216	14,208
Investment in Federal Home Loan Bank stock	1,808	550	597
Investment in Federal Reserve Bank stock	2,865	2,840	2,751
Short-term investments	22,316	22,575	9,634
Total interest and dividend income	1,051,095	1,080,448	1,095,831
INTEREST EXPENSE
Customer deposit accounts	75,895	107,110	116,737
Federal Home Loan Bank advances	6,248	15,461	26,641
Securities sold under repurchase agreements	46,166	48,561	48,993
Long-term debt	3,855	5,832	6,420
Other borrowings	4	458	2,326
Total interest expense	132,168	177,422	201,117
Net interest income before provision for loan losses	918,927	903,026	894,714
Provision for loan losses, excluding covered loans	60,168	92,584	195,934
Provision for loan losses on covered loans	5,016	2,422	4,225
Net interest income after provision for loan losses	853,743	808,020	694,555
NONINTEREST (LOSS) INCOME
Gain on acquisition			22,874
Impairment loss on investment securities	(5,165)	(5,736)	(32,127)
Less: Noncredit-related impairment loss recorded in other comprehensive income	5,066	5,103	15,458
Net impairment loss on investment securities recognized in earnings	(99)	(633)	(16,669)
Decrease in FDIC indemnification asset and receivable	(122,251)	(100,141)	(83,213)
Branch fees	33,604	33,776	32,634
Net gain on sales of investment securities	757	9,703	31,237
Letters of credit fees and commissions	19,104	13,997	11,816
Foreign exchange income	7,166	9,143	3,171
Ancillary loan fees	8,831	8,350	8,526
Income from life insurance policies	4,015	4,031	4,083
Net gain on sales of loans	17,045	20,185	18,515
Net gain (loss) on sale of fixed assets	4,275	2,274	(189)
Other operating income	21,935	10,239	6,485
Total noninterest (loss) income	(5,618)	10,924	39,270
NONINTEREST EXPENSE
Compensation and employee benefits	171,374	160,093	170,052
Occupancy and equipment expense	55,475	50,082	52,073
Amortization of investments in affordable housing partnerships and other investments	18,058	17,324	10,032
Amortization of premiums on deposits acquired	10,906	12,327	13,283
Deposit insurance premiums and regulatory assessments	14,130	20,531	25,201
Loan related expenses	14,987	19,379	21,070
Other real estate owned expense	22,349	40,435	61,568
Legal expense	25,441	21,327	19,577
Prepayment penalty for FHLB advances and other borrowings	6,860	12,281	13,832
Data processing	9,231	8,598	10,615
Deposit-related expenses	6,007	5,699	4,750
Consulting expense	7,984	7,151	7,984
Other operating expenses	59,731	60,383	67,879
Total noninterest expense	422,533	435,610	477,916
INCOME BEFORE PROVISION FOR INCOME TAXES	425,592	383,334	255,909
PROVISION FOR INCOME TAXES	143,942	138,100	91,345
NET INCOME	281,650	245,234	164,564
PREFERRED STOCK DIVIDENDS AMORTIZATION OF PREFERRED STOCK DISCOUNT	6,857	6,857	43,126
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 274,793	$ 238,377	$ 121,438
EARNINGS PER SHARE AVAILABLE TO COMMON STOCKHOLDERS
BASIC (in dollars per share)	$ 1.92	$ 1.62	$ 0.88
DILUTED (in dollars per share)	$ 1.89	$ 1.60	$ 0.83
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	141,457	147,093	137,478
DILUTED (in shares)	147,175	153,467	147,102
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.4	$ 0.16	$ 0.04