Consolidated Statements Of Condition - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Assets
Cash and due from banks	$ 279,936	$ 277,534	$ 251,896
Federal funds sold and securities purchased under resale agreements	57	57	56
Interest bearing deposits with banks	1,137,044	1,063,242	1,218,728
Available-for-sale securities, at fair value	2,164,985	1,803,666	1,665,903
Held-to-maturity securities, at amortized cost ($911.6 million, $812.5 million and $807.0 million fair value at September 30, 2018, December 31, 2017 and September 30, 2017 respectively)	966,438	826,449	819,340
Trading account securities	688	995	643
Equity securities with readily determinable fair value	36,414	0	0
Federal Home Loan Bank and Federal Reserve Bank stock	99,998	89,989	87,192
Brokerage customer receivables	15,649	26,431	23,631
Mortgage loans held-for-sale, at fair value	338,111	313,592	370,282
Loans, net of unearned income, excluding covered loans	23,123,951	21,640,797	20,912,781
Covered loans	0	0	46,601
Total loans	23,123,951	21,640,797	20,959,382
Allowance for loan losses	(149,756)	(137,905)	(133,119)
Allowance for covered loan losses	0	0	(758)
Net loans	22,974,195	21,502,892	20,825,505
Premises and equipment, net	664,469	621,895	609,978
Lease investments, net	199,241	212,335	193,828
Accrued interest receivable and other assets	700,568	567,374	580,612
Trade date securities receivable	0	90,014	189,896
Goodwill	537,560	501,884	502,021
Other intangible assets	27,378	17,621	18,651
Total assets	30,142,731	27,915,970	27,358,162
Deposits:
Non-interest bearing	6,399,213	6,792,497	6,502,409
Interest bearing	18,517,502	16,390,850	16,392,654
Total deposits	24,916,715	23,183,347	22,895,063
Federal Home Loan Bank advances	615,000	559,663	468,962
Other borrowings	373,571	266,123	251,680
Subordinated notes	139,172	139,088	139,052
Junior subordinated debentures	253,566	253,566	253,566
Trade date securities payable	0	0	880
Accrued interest payable and other liabilities	664,885	537,244	440,034
Total liabilities	26,962,909	24,939,031	24,449,237
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 September 30, 2018, December 31, 2017 and September 30, 2017; 56,486,573 shares issued at September 30, 2018, 56,068,220 shares issued at December 31, 2017 and 55,939,801 shares issued at September 30, 2017	56,486	56,068	55,940
Surplus	1,553,353	1,529,035	1,519,596
Treasury stock, at cost, 109,404 shares at September 30, 2018, 103,013 shares at December 31, 2017, and 101,738 shares at September 30, 2017	(5,547)	(4,986)	(4,884)
Retained earnings	1,543,680	1,313,657	1,254,759
Accumulated other comprehensive loss	(93,150)	(41,835)	(41,486)
Total shareholders’ equity	3,179,822	2,976,939	2,908,925
Total liabilities and shareholders’ equity	30,142,731	27,915,970	27,358,162
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at September 30, 2018, December 31, 2017 and September 30, 2017
Preferred stock, no par value; 20,000,000 shares authorized:
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at September 30, 2018, December 31, 2017 and September 30, 2017	$ 125,000	$ 125,000	$ 125,000