Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Operating Activities
Net Income	$ 115,867	$ 86,430
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	25,000	10,500
Net accretion of premiums and discounts from acquisition	(1,711)	(1,255)
Depreciation and amortization	40,949	38,498
Deferred income tax expense (benefit)	911	(6,276)
Net (increase) decrease in trading securities	(30,635)	10,505
Gains on sales of securities available for sale, net	(8,509)	(8,404)
Gains on sales of assets	(136)	(99)
Amortization of securities premiums, net of discount accretion	43,467	40,971
Originations of loans held for sale	(71,726)	(78,931)
Net gains on sales of loans held for sale	(1,281)	(1,131)
Proceeds from sales of loans held for sale	61,716	79,673
Equity-based compensation	8,682	9,489
Net tax benefit related to equity compensation plans	(261)	732
Changes in:
Accrued income	(2,889)	(4,811)
Accrued expenses and taxes	4,789	146
Other assets and liabilities, net	(14,466)	(2,582)
Net cash provided by operating activities	169,767	173,455
Investing Activities
Proceeds from maturities of securities held to maturity	29,757	31,410
Proceeds from sales of securities available for sale	951,263	782,789
Proceeds from maturities of securities available for sale	1,300,372	925,017
Purchases of securities held to maturity	(373,520)	(341,773)
Purchases of securities available for sale	(1,689,198)	(1,293,123)
Net increase in loans	(876,784)	(604,895)
Net (increase) decrease in fed funds sold and resell agreements	(71,264)	29,675
Net increase in interest bearing balances due from other financial institutions	65,203	40,586
Purchases of premises and equipment	(38,950)	(42,100)
Net cash activity from acquisitions		104,611
Proceeds from sales of premises and equipment	2,164	147
Increase in COLI/BOLI cash surrender value	(7,095)	(204,647)
Net cash used in investing activities	(708,052)	(572,303)
Financing Activities
Net increase in demand and savings deposits	460,129	854,302
Net decrease in time deposits	(173,783)	(353,137)
Net increase (decrease) in fed funds purchased and repurchase agreements	203,061	(682,532)
Net decrease in short-term debt	(5,000)	(112,133)
Repayment of long-term debt	(11,285)	(10,597)
Payment of contingent consideration on acquisitions	(3,031)	(18,702)
Cash dividends paid	(36,385)	(34,104)
Proceeds from exercise of stock options and sales of treasury shares	10,250	5,494
Purchases of treasury stock	(14,189)	(6,173)
Net cash provided by (used in) financing activities	429,767	(357,582)
Decrease in cash and cash equivalents	(108,518)	(756,430)
Cash and cash equivalents at beginning of period	819,112	1,787,230
Cash and cash equivalents at end of period	710,594	1,030,800
Supplemental Disclosures:
Income taxes paid	30,995	36,404
Total interest paid	$ 20,555	12,769
Transactions related to bank acquisitions:
Assets acquired		1,321,453
Liabilities assumed		$ 1,159,920