Consolidated Statements Of Condition (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Assets
Cash and due from banks	$ 199,575,000	$ 284,731,000	$ 146,014,000
Federal funds sold and securities purchased under resale agreements	13,626,000	30,297,000	14,588,000
Interest-bearing deposits with other banks (no balance restricted for securitization investors at March 31, 2013 and December 31, 2012, and a balance restricted for securitization investors of $529,418 at March 31, 2012)	685,302,000	1,035,743,000	900,755,000
Available-for-sale securities, at fair value	1,870,831,000	1,796,076,000	1,869,344,000
Trading account securities	1,036,000	583,000	1,140,000
Federal Home Loan Bank and Federal Reserve Bank stock	76,601,000	79,564,000	88,216,000
Brokerage customer receivables	25,614,000	24,864,000	31,085,000
Mortgage loans held-for-sale, at fair value	370,570,000	385,033,000	339,600,000
Mortgage loans held-for-sale, at lower of cost or market	10,352,000	27,167,000	10,728,000
Loans, net of unearned income, excluding covered loans	11,900,312,000	11,828,943,000	10,717,384,000
Covered loans	518,661,000	560,087,000	691,220,000
Total loans	12,418,973,000	12,389,030,000	11,408,604,000
Less: Allowance for loan losses	110,348,000	107,351,000	111,023,000
Less: Allowance for covered loan losses	12,272,000	13,454,000	17,735,000
Net loans (no balance restricted for securitization investors at March 31, 2013 and December 31, 2012, and a balance restricted for securitization investors of $156,132 at March 31, 2012)	12,296,353,000	12,268,225,000	11,279,846,000
Premises and equipment, net	504,803,000	501,205,000	434,700,000
FDIC Indemnification asset	170,696,000	208,160,000	263,212,000
Accrued interest receivable and other assets	485,746,000	511,617,000	463,394,000
Goodwill	343,632,000	345,401,000	307,295,000
Other intangible assets	19,510,000	20,947,000	22,101,000
Total assets	17,074,247,000	17,519,613,000	16,172,018,000
Liabilities and Shareholders’ Equity
Non-interest bearing	2,243,440,000	2,396,264,000	1,901,753,000
Interest bearing	11,719,317,000	12,032,280,000	10,764,100,000
Total deposits	13,962,757,000	14,428,544,000	12,665,853,000
Notes payable	31,911,000	2,093,000	52,639,000
Federal Home Loan Bank advances	414,032,000	414,122,000	466,391,000
Other borrowings	256,244,000	274,411,000	411,037,000
Secured borrowings-owed to securitization investors	0	0	428,000,000
Subordinated notes	15,000,000	15,000,000	35,000,000
Junior subordinated debentures	249,493,000	249,493,000	249,493,000
Trade date securities payable	1,250,000	0	0
Accrued interest payable and other liabilities	317,872,000	331,245,000	175,684,000
Total liabilities	15,248,559,000	15,714,908,000	14,484,097,000
Preferred stock, no par value; 20,000,000 shares authorized:
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at March 31, 2013 and December 31, 2012 and 60,000,000 shares authorized at March 31, 2012; 37,272,279 shares issued at March 31, 2013, 37,107,684 shares issued at December 31, 2012, and 36,521,562 shares issued at March 31, 2012	37,272,000	37,108,000	36,522,000
Surplus	1,040,098,000	1,036,295,000	1,008,326,000
Treasury stock, at cost, 258,572 shares at March 31, 2013, 249,329 shares at December 31, 2012, and 232,182 shares at March 31, 2012	(8,187,000)	(7,838,000)	(6,559,000)
Retained earnings	581,131,000	555,023,000	478,160,000
Accumulated other comprehensive (loss) income	(1,067,000)	7,711,000	(4,830,000)
Total shareholders' equity	1,825,688,000	1,804,705,000	1,687,921,000
Total liabilities and shareholders' equity	17,074,247,000	17,519,613,000	16,172,018,000
Series A Preferred Stock [Member]
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, value	49,941,000	49,906,000	49,802,000
Series C Preferred Stock [Member]
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, value	$ 126,500,000	$ 126,500,000	$ 126,500,000