Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 119,475	$ 110,967
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	8,182	(500)
Depreciation and amortization of premises and equipment	20,547	20,302
Net amortization of investment securities premiums	7,434	5,369
Investment securities gains, net	(1,025)	(8,290)
Gain on sales of mortgage loans held for sale	(11,967)	(10,588)
Proceeds from sales of mortgage loans held for sale	493,457	599,557
Originations of mortgage loans held for sale	(492,440)	(598,384)
Amortization of intangible assets	0	241
Amortization of issuance costs on long-term debt	347	432
Stock-based compensation	4,808	4,371
Excess tax benefits from stock-based compensation	(58)	(86)
Loss on redemption of trust preferred securities	0	5,626
Increase in accrued interest receivable	(833)	(1,028)
Increase in other assets	(9,075)	(10,926)
Increase (decrease) in accrued interest payable	2,921	(3,318)
Increase in other liabilities	2,061	21,604
Total adjustments	24,359	24,382
Net cash provided by operating activities	143,834	135,349
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	84,978	29,309
Proceeds from principal repayments and maturities of securities available for sale	426,932	317,813
Purchase of securities available for sale	(484,164)	(444,111)
Increase in short-term investments	(136,450)	(156,837)
Net increase in loans	(567,061)	(440,681)
Net purchases of premises and equipment	(23,021)	(19,980)
Net cash used in investing activities	(698,786)	(714,487)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	880,795	852,611
Net decrease in time deposits	(60,633)	(135,723)
(Decrease) increase in short-term borrowings	(233,621)	101,912
Additions to long-term debt	16,000	347,778
Repayments of long-term debt	(603)	(510,038)
Net proceeds from issuance of common stock	5,468	6,852
Excess tax benefits from stock-based compensation	58	86
Dividends paid	(48,590)	(46,239)
Acquisition of treasury stock	(18,545)	(50,000)
Net cash provided by financing activities	540,329	567,239
Net Decrease in Cash and Due From Banks	(14,623)	(11,899)
Cash and Due From Banks at Beginning of Period	101,120	105,702
Cash and Due From Banks at End of Period	86,497	93,803
Cash paid during the period for:
Interest	58,632	67,352
Income taxes	$ 9,404	$ 9,168