Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Operating Activities
Net Income	$ 73,542	$ 63,979
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	12,000	8,000
Net accretion of premiums and discounts from acquisition	(935)
Depreciation and amortization	27,405	24,027
Deferred income tax expense (benefit)	2,665	(2,577)
Net increase in trading securities	(27,291)	(7,446)
Gains on sales of securities available for sale, net	(5,531)	(8,303)
(Gains) losses on sales of assets	(720)	5
Amortization of securities premiums, net of discount accretion	29,080	26,465
Originations of loans held for sale	(43,145)	(59,422)
Net gains on sales of loans held for sale	(871)	(827)
Proceeds from sales of loans held for sale	34,110	58,054
Equity based compensation	5,630	6,239
Changes in:
Accrued income	(2,523)	(1,927)
Accrued expenses and taxes	(11,902)	(13,179)
Other assets and liabilities, net	(9,282)	12,647
Net cash provided by operating activities	82,232	105,735
Investing Activities
Proceeds from maturities of securities held to maturity	22,539	26,663
Proceeds from sales of securities available for sale	598,740	705,238
Proceeds from maturities of securities available for sale	779,759	645,959
Purchases of securities held to maturity	(238,029)	(198,352)
Purchases of securities available for sale	(1,281,401)	(1,238,323)
Net increase in loans	(660,088)	(473,924)
Net (increase) decrease in fed funds sold and resell agreements	(22,656)	37,111
Net increase in interest bearing balances due from other financial institutions	52,488	19,200
Purchases of premises and equipment	(17,526)	(29,479)
Net cash activity from acquisitions		104,539
Proceeds from sales of premises and equipment	1,623	117
Increase in COLI/BOLI cash surrender value	(4,700)
Net cash used in investing activities	(769,251)	(401,251)
Financing Activities
Net increase in demand and savings deposits	667,041	239,367
Net decrease in time deposits	(110,349)	(303,635)
Net decrease in fed funds purchased and repurchase agreements	(29,495)	(250,697)
Net decrease in short-term debt		(112,133)
Repayment of long-term debt	(1,272)	(10,580)
Payment of contingent consideration on acquisitions	(3,031)	(18,702)
Cash dividends paid	(24,243)	(22,295)
Net tax benefit related to equity compensation plans	250	664
Proceeds from exercise of stock options and sales of treasury shares	8,436	3,532
Purchases of treasury stock	(13,581)	(5,379)
Net cash provided by (used in) financing activities	493,756	(479,858)
Decrease in cash and cash equivalents	(193,263)	(775,374)
Cash and cash equivalents at beginning of period	819,112	1,787,230
Cash and cash equivalents at end of period	625,849	1,011,856
Supplemental Disclosures:
Income taxes paid	19,295	25,089
Total interest paid	$ 13,199	7,360
Transactions related to bank acquisitions
Assets acquired		1,321,322
Liabilities assumed		$ 1,160,044