Consolidated Statements Of Condition - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Assets
Cash and due from banks	$ 248,094	$ 225,136	$ 349,013
Federal funds sold and securities purchased under resale agreements	4,115	5,571	7,965
Interest bearing deposits with banks	591,721	998,437	506,871
Available-for-sale securities, at fair value	2,162,061	1,792,078	1,824,240
Trading account securities	1,597	1,206	2,234
Federal Home Loan Bank and Federal Reserve Bank stock	89,818	91,582	84,531
Brokerage customer receivables	29,753	24,221	28,199
Mortgage loans held-for-sale, at fair value	497,283	351,290	363,627
Loans, net of unearned income, excluding covered loans	15,513,650	14,409,398	13,749,996
Covered loans	193,410	226,709	275,154
Total loans	15,707,060	14,636,107	14,025,150
Less: Allowance for loan losses	100,204	91,705	92,253
Less: Allowance for covered loan losses	2,215	2,131	1,667
Net loans	15,604,641	14,542,271	13,931,230
Premises and equipment, net	571,498	555,228	535,281
FDIC indemnification asset	3,429	11,846	46,115
Accrued interest receivable and other assets	556,344	501,882	525,394
Trade date securities receivable	0	485,534	292,366
Goodwill	421,646	405,634	381,721
Other intangible assets	17,924	18,811	16,894
Total assets	20,799,924	20,010,727	18,895,681
Deposits:
Non-interest bearing	3,910,310	3,518,685	3,072,430
Interest bearing	13,172,108	12,763,159	12,483,946
Total deposits	17,082,418	16,281,844	15,556,376
Federal Home Loan Bank advances	444,017	733,050	580,582
Other borrowings	261,908	196,465	43,716
Subordinated notes	140,000	140,000	140,000
Junior subordinated debentures	249,493	249,493	249,493
Trade date securities payable	0	3,828	0
Accrued interest payable and other liabilities	357,106	336,225	327,279
Total liabilities	18,534,942	17,940,905	16,897,446
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, 2015, December 31, 2014, and June 30, 2014; 47,762,681 shares issued at June 30, 2015, 46,881,108 shares issued at December 31, 2014, and 46,626,772 shares issued at June 30, 2014	47,763	46,881	46,627
Surplus	1,159,052	1,133,955	1,125,551
Treasury stock, at cost, 85,424 shares at June 30, 2015, 76,053 shares at December 31, 2014, and 73,867 shares at June 30, 2014	(3,964)	(3,549)	(3,449)
Retained earnings	872,690	803,400	737,542
Accumulated other comprehensive loss	(61,871)	(37,332)	(34,503)
Total shareholders' equity	2,264,982	2,069,822	1,998,235
Total liabilities and shareholders' equity	20,799,924	20,010,727	18,895,681
Series C - $1,000 liquidation value; 126,312 shares issued and outstanding at June 30, 2015 and 126,467 shares issued and outstanding at December 31, 2014 and June 30, 2014
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, Series C and Series D	126,312	126,467	126,467
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at June 30, 2015 and no shares issued and outstanding at December 31, 2014 and June 30, 2014
Preferred stock, no par value; 20,000,000 shares authorized:
Preferred stock, Series C and Series D	$ 125,000	$ 0	$ 0