Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 38,257	$ 40,036
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,530	(3,700)
Depreciation and amortization of premises and equipment	6,949	7,361
Net amortization of investment securities premiums	2,055	1,431
Investment securities gains, net	(947)	(4,145)
Gain on sales of mortgage loans held for sale	(2,670)	(3,533)
Proceeds from sales of mortgage loans held for sale	114,255	171,051
Originations of mortgage loans held for sale	(114,418)	(184,120)
Amortization of intangible assets	0	130
Amortization of issuance costs on long-term debt	154	147
Stock-based compensation	1,436	1,071
Excess tax benefits from stock-based compensation	(10)	(15)
Increase in accrued interest receivable	(1,612)	(398)
(Increase) decrease in other assets	(4,469)	3,794
Increase in accrued interest payable	2,843	312
(Decrease) increase in other liabilities	(9,245)	1,234
Total adjustments	(4,149)	(9,380)
Net cash provided by operating activities	34,108	30,656
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	46,541	11,567
Proceeds from maturities of securities available for sale	117,221	105,647
Purchase of securities available for sale	(169,436)	(37,142)
Increase in short-term investments	(115,544)	(280,584)
Net increase in loans	(38,976)	(6,362)
Net purchases of premises and equipment	(9,471)	(7,575)
Net cash used in investing activities	(169,665)	(214,449)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	269,899	171,022
Net increase (decrease) in time deposits	2,064	(24,031)
(Decrease) increase in short-term borrowings	(144,780)	80,386
Additions to long-term debt	16,000	0
Repayments of long-term debt	(42)	(45,043)
Net proceeds from issuance of common stock	1,637	1,926
Excess tax benefits from stock-based compensation	10	15
Dividends paid	(15,676)	(14,314)
Acquisition of treasury stock	(11,196)	0
Net cash provided by financing activities	117,916	169,961
Net Decrease in Cash and Due From Banks	(17,641)	(13,832)
Cash and Due From Banks at Beginning of Period	101,120	105,702
Cash and Due From Banks at End of Period	83,479	91,870
Cash paid during the period for:
Interest	17,414	21,879
Income taxes	$ 3,972	$ 146