Consolidated Statements Of Condition (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Assets
Cash and due from banks	$ 349,013	$ 253,408	$ 224,286
Federal funds sold and securities purchased under resale agreements	7,965	10,456	9,013
Interest bearing deposits with banks	506,871	495,574	440,656
Available-for-sale securities, at fair value	1,824,240	2,176,290	1,843,824
Trading account securities	2,234	497	659
Federal Home Loan Bank and Federal Reserve Bank stock	84,531	79,261	79,354
Brokerage customer receivables	28,199	30,953	26,214
Mortgage loans held-for-sale	363,627	334,327	537,991
Loans, net of unearned income, excluding covered loans	13,749,996	12,896,602	12,516,892
Covered loans	275,154	346,431	454,602
Total loans	14,025,150	13,243,033	12,971,494
Less: Allowance for loan losses	92,253	96,922	106,842
Less: Allowance for covered loan losses	1,667	10,092	14,429
Net loans	13,931,230	13,136,019	12,850,223
Premises and equipment, net	535,281	531,947	512,928
FDIC indemnification asset	46,115	85,672	137,681
Accrued interest receivable and other assets	525,394	569,619	573,709
Trade date securities receivable	292,366	0	0
Goodwill	381,721	374,547	356,871
Other intangible assets	16,894	19,213	20,137
Total assets	18,895,681	18,097,783	17,613,546
Deposits:
Non-interest bearing	3,072,430	2,721,771	2,450,659
Interest bearing	12,483,946	11,947,018	11,915,195
Total deposits	15,556,376	14,668,789	14,365,854
Notes payable	0	364	1,729
Federal Home Loan Bank advances	580,582	417,762	585,942
Other borrowings	43,716	254,740	252,776
Subordinated notes	140,000	0	10,000
Junior subordinated debentures	249,493	249,493	249,493
Trade date securities payable	0	303,088	577
Accrued interest payable and other liabilities	327,279	302,958	310,515
Total liabilities	16,897,446	16,197,194	15,776,886
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 June 30, 2014, December 31, 2013, and June 30, 2013; 46,626,772 shares issued at June 30, 2014, 46,181,588 shares issued at December 31, 2013, and 37,984,485 shares issued at June 30, 2013	46,627	46,181	37,985
Surplus	1,125,551	1,117,032	1,066,796
Treasury stock, at cost, 73,867 shares at June 30, 2014, 65,005 shares at December 31, 2013, and 259,342 shares at June 30, 2013	(3,449)	(3,000)	(8,214)
Retained earnings	737,542	676,935	612,821
Accumulated other comprehensive loss	(34,503)	(63,036)	(49,204)
Total shareholders' equity	1,998,235	1,900,589	1,836,660
Total liabilities and shareholders' equity	$ 18,895,681	$ 18,097,783	$ 17,613,546