Consolidated Statements Of Condition (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Assets
Cash and due from banks	$ 330,262,000	$ 253,408,000	$ 199,575,000
Federal funds sold and securities purchased under resale agreements	12,476,000	10,456,000	13,626,000
Interest-bearing deposits with other banks	540,964,000	495,574,000	685,302,000
Available-for-sale securities, at fair value	1,949,697,000	2,176,290,000	1,870,831,000
Trading account securities	1,068,000	497,000	1,036,000
Federal Home Loan Bank and Federal Reserve Bank stock	78,524,000	79,261,000	76,601,000
Brokerage customer receivables	26,884,000	30,953,000	25,614,000
Mortgage loans held-for-sale	215,231,000	334,327,000	380,922,000
Loans, net of unearned income, excluding covered loans	13,133,160,000	12,896,602,000	11,900,312,000
Covered loans	312,478,000	346,431,000	518,661,000
Total loans	13,445,638,000	13,243,033,000	12,418,973,000
Less: Allowance for loan losses	92,275,000	96,922,000	110,348,000
Less: Allowance for covered loan losses	3,447,000	10,092,000	12,272,000
Net loans	13,349,916,000	13,136,019,000	12,296,353,000
Premises and equipment, net	531,763,000	531,947,000	504,803,000
FDIC indemnification asset	60,298,000	85,672,000	170,696,000
Accrued interest receivable and other assets	549,705,000	569,619,000	485,746,000
Trade date securities receivable	182,600,000	0	0
Goodwill	373,725,000	374,547,000	343,632,000
Other intangible assets	18,050,000	19,213,000	19,510,000
Total assets	18,221,163,000	18,097,783,000	17,074,247,000
Deposits:
Non-interest bearing	2,773,922,000	2,721,771,000	2,243,440,000
Interest bearing	12,355,123,000	11,947,018,000	11,719,317,000
Total deposits	15,129,045,000	14,668,789,000	13,962,757,000
Notes payable	182,000	364,000	31,911,000
Federal Home Loan Bank advances	387,672,000	417,762,000	414,032,000
Other borrowings	230,904,000	254,740,000	256,244,000
Subordinated notes	0	0	15,000,000
Junior subordinated debentures	249,493,000	249,493,000	249,493,000
Trade date securities payable	0	303,088,000	1,250,000
Accrued interest payable and other liabilities	283,724,000	302,958,000	317,872,000
Total liabilities	16,281,020,000	16,197,194,000	15,248,559,000
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, 2014, December 31, 2013, and March 31, 2013; 46,332,213 shares issued at March 31, 2014, 46,181,588 shares issued at December 31, 2013, and 37,272,279 shares issued at March 31, 2013	46,332,000	46,181,000	37,272,000
Surplus	1,122,233,000	1,117,032,000	1,040,098,000
Treasury stock, at cost, 73,253 shares at March 31, 2014, 65,005 shares at December 31, 2013, and 258,572 shares at March 31, 2013	(3,380,000)	(3,000,000)	(8,187,000)
Retained earnings	705,234,000	676,935,000	581,131,000
Accumulated other comprehensive loss	(56,753,000)	(63,036,000)	(1,067,000)
Total shareholders' equity	1,940,143,000	1,900,589,000	1,825,688,000
Total liabilities and shareholders' equity	$ 18,221,163,000	$ 18,097,783,000	$ 17,074,247,000