Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 78,007	$ 76,716
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	4,041	(1,500)
Depreciation and amortization of premises and equipment	13,804	13,920
Net amortization of investment securities premiums	4,647	3,288
Investment securities gains, net	(1,023)	(6,560)
Gain on sales of mortgage loans held for sale	(7,110)	(7,961)
Proceeds from sales of mortgage loans held for sale	304,516	406,703
Originations of mortgage loans held for sale	(314,850)	(415,200)
Amortization of intangible assets	0	236
Amortization of issuance costs on long-term debt	193	279
Stock-based compensation	3,256	2,838
Excess tax benefits from stock-based compensation	(28)	(63)
(Increase) decrease in accrued interest receivable	(549)	625
(Increase) decrease in other assets	(18,268)	10,181
Decrease in accrued interest payable	(2,388)	(2,873)
Increase (decrease) in other liabilities	9,866	(3,322)
Total adjustments	(3,893)	591
Net cash provided by operating activities	74,114	77,307
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	84,972	18,815
Proceeds from maturities of securities available for sale	282,832	205,620
Purchase of securities available for sale	(355,220)	(346,322)
(Increase) decrease in short-term investments	(115,570)	35,759
Net increase in loans	(326,902)	(147,492)
Net purchases of premises and equipment	(17,130)	(14,687)
Net cash used in investing activities	(447,018)	(248,307)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	202,552	205,901
Net decrease in time deposits	(42,305)	(67,698)
Increase in short-term borrowings	224,551	79,316
Additions to long-term debt	16,000	148,099
Repayments of long-term debt	(183)	(155,150)
Net proceeds from issuance of common stock	3,320	4,632
Excess tax benefits from stock-based compensation	28	63
Dividends paid	(31,278)	(30,397)
Acquisition of treasury stock	(16,254)	(19,013)
Net cash provided by financing activities	356,431	165,753
Net Decrease in Cash and Due From Banks	(16,473)	(5,247)
Cash and Due From Banks at Beginning of Period	101,120	105,702
Cash and Due From Banks at End of Period	84,647	100,455
Cash paid during the period for:
Interest	43,038	46,373
Income taxes	$ 9,087	$ 11,051