Consolidated Statements Of Condition (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Assets
Cash and due from banks	$ 208,480	$ 271,454	$ 286,743
Federal funds sold and securities purchased under resale agreements	3,820	4,341	4,129
Interest bearing deposits with banks	817,013	607,782	697,799
Available-for-sale securities, at fair value	770,983	1,716,388	1,721,030
Held-to-maturity securities, at amortized cost ($924.3 million and $878.1 million fair value at March 31, 2016 and December 31, 2015, respectively)	911,715	884,826	0
Trading account securities	2,116	448	7,811
Federal Home Loan Bank and Federal Reserve Bank stock	113,222	101,581	92,948
Brokerage customer receivables	28,266	27,631	25,287
Mortgage loans held-for-sale	314,554	388,038	446,355
Loans, net of unearned income, excluding covered loans	17,446,413	17,118,117	14,953,059
Covered loans	138,848	148,673	209,694
Total loans	17,585,261	17,266,790	15,162,753
Less: Allowance for loan losses	110,171	105,400	94,446
Less: Allowance for covered loan losses	2,507	3,026	1,878
Net loans	17,472,583	17,158,364	15,066,429
Premises and equipment, net	591,608	592,256	559,281
Lease investments, net	89,337	63,170	383
FDIC indemnification asset	0	0	10,224
Accrued interest receivable and other assets	647,853	597,099	526,029
Trade date securities receivable	1,008,613	0	488,063
Goodwill	484,280	471,761	420,197
Other intangible assets	23,725	24,209	18,858
Total assets	23,488,168	22,909,348	20,371,566
Deposits:
Non-interest bearing	5,205,410	4,836,420	3,779,609
Interest bearing	14,011,661	13,803,214	13,159,160
Total deposits	19,217,071	18,639,634	16,938,769
Federal Home Loan Bank advances	799,482	853,431	406,839
Other borrowings	253,126	265,785	186,716
Subordinated notes	138,888	138,861	138,782
Junior subordinated debentures	253,566	268,566	249,493
Trade date securities payable	0	538	2,929
Accrued interest payable and other liabilities	407,593	390,259	316,964
Total liabilities	21,069,726	20,557,074	18,240,492
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, 2016, December 31, 2015 and March 31, 2015; 48,608,559 shares issued at March 31, 2016, 48,468,894 shares issued at December 31, 2015 and 47,474,721 shares issued at March 31, 2015	48,608	48,469	47,475
Surplus	1,194,750	1,190,988	1,156,542
Treasury stock, at cost, 89,561 shares at March 31, 2016, 85,615 shares at December 31, 2015, and 85,113 shares at March 31, 2015	(4,145)	(3,973)	(3,948)
Retained earnings	967,882	928,211	835,669
Accumulated other comprehensive loss	(39,910)	(62,708)	(31,091)
Total shareholders' equity	2,418,442	2,352,274	2,131,074
Total liabilities and shareholders' equity	23,488,168	22,909,348	20,371,566
Series C - $1,000 liquidation value; 126,257 shares issued and outstanding at March 31, 2016, 126,287 shares issued and outstanding at December 31, 2015, and 126,427 shares issued and outstanding at March 31, 2015
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, Series C and Series D	126,257	126,287	126,427
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at March 31, 2016 and December 31, 2015 and no shares issued and outstanding at March 31, 2015
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, Series C and Series D	$ 125,000	$ 125,000	$ 0