CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 979,394	$ 945,530		$ 945,798
Investment securities	43,846	58,184		89,469
Securities purchased under resale agreements	21,236	20,392		19,216
Investment in Federal Home Loan Bank stock	3,982	1,808		550
Investment in Federal Reserve Bank stock	2,887	2,865		2,840
Short-term investments	17,340	22,316		22,575
Total interest and dividend income	1,068,685	1,051,095		1,080,448
INTEREST EXPENSE
Customer deposit accounts	63,496	75,895		107,110
Federal Home Loan Bank advances	4,173	6,248		15,461
Securities sold under repurchase agreements	41,381	46,166		48,561
Long-term debt	3,442	3,855		5,832
Other borrowings		4		458
Total interest expense	112,492	132,168		177,422
Net interest income before provision for loan losses	956,193	918,927		903,026
Provision for loan losses, excluding covered loans	18,336	60,168		92,584
Provision for loan losses on covered loans	4,028	5,016		2,422
Net interest income after provision for loan losses	933,829	853,743		808,020
NONINTEREST (LOSS) INCOME
Impairment loss on investment securities		(5,165)		(5,736)
Less: Noncredit-related impairment loss recorded in other comprehensive income		5,066		5,103
Net impairment loss on investment securities recognized in earnings		(99)		(633)
Decrease in FDIC indemnification asset and receivable	(228,585)	(122,251)		(100,141)
Branch fees	32,036	30,906		31,510
Net gain on sales of investment securities	12,089	757		9,703
Letters of credit fees and commissions	22,116	19,104		13,997
Foreign exchange income	12,658	7,166		9,143
Ancillary loan fees	9,368	8,831		8,350
Income from life insurance policies	3,778	4,015		4,031
Net gain on sales of loans	7,750	17,045		20,185
Net gain on sale of fixed assets	1,521	4,275		2,274
Other operating income	34,801	24,633		12,505
Total noninterest (loss) income	(92,468)	(5,618)		10,924
NONINTEREST EXPENSE
Compensation and employee benefits	175,906	171,374		160,093
Occupancy and equipment expense	56,641	55,475		50,082
Amortization of investments in affordable housing partnerships and other investments	27,268	18,058		17,324
Amortization of premiums on deposits acquired	9,365	10,906		12,327
Deposit insurance premiums and regulatory assessments	16,550	14,130		20,531
Loan related expenses	12,520	14,987		19,379
Other real estate owned (gain on sale) expense	(1,128)	22,349		40,435
Legal expense	31,718	25,441		21,327
Prepayment penalty for FHLB advances and other borrowings		6,860		12,281
Data processing	9,095	9,231		8,598
Deposit-related expenses	6,536	6,007		5,699
Consulting expense	6,446	7,984		7,151
Other operating expenses	64,594	59,731		60,383
Total noninterest expense	415,511	422,533		435,610
INCOME BEFORE PROVISION FOR INCOME TAXES	425,850	425,592		383,334
PROVISION FOR INCOME TAXES	130,805	143,942		138,100
NET INCOME	295,045	281,650		245,234
PREFERRED STOCK DIVIDENDS	3,428	6,857		6,857
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 291,617	$ 274,793		$ 238,377
EARNINGS PER SHARE AVAILABLE TO COMMON STOCKHOLDERS
BASIC (in dollars per share)	$ 2.11	$ 1.92	[1]	$ 1.62
DILUTED (in dollars per share)	$ 2.10	$ 1.89	[1]	$ 1.60
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	137,342	141,457	[1]	147,093
DILUTED (in shares)	139,574	147,175	[1]	153,467
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.60	$ 0.40		$ 0.16

[1] On April 1, 2012, the Company revised its calculation of earnings per share to account for participating securities under the two-class method. This revision to the earnings per share calculation does not have an impact to previous periods as the amounts are immaterial.