Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities
Net income	$ 46,816	$ 42,430
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,600	9,000
Gains on sales of loans	(3,137)	(6,041)
Proceeds from sales of loans	105,870	181,644
Loans originated for sale	(106,861)	(165,845)
Net gains on sales of other real estate and repossessed assets	(1,443)	(2,265)
Depreciation of premises and equipment	6,431	6,552
Amortization of intangible assets	2,211	2,794
Gain on sale of investment securities	0	(1,104)
Net amortization of premiums and discounts on investment securities	3,183	3,054
Share-based compensation expense	1,881	2,131
Contributions to defined benefit pension plan	0	(15,000)
Net (increase) decrease in interest receivable and other assets	(2,297)	6,634
Net increase (decrease) in interest payable and other liabilities	403	(786)
Net cash provided by operating activities	57,657	63,198
Investment securities – available-for-sale:
Proceeds from sales	0	38,028
Proceeds from maturities, calls and principal reductions	109,004	121,959
Purchases	0	(289,189)
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	75,168	51,962
Purchases	(120,367)	(104,733)
Net increase in loans	(407,835)	(371,423)
Proceeds from sales of other real estate and repossessed assets	8,735	13,229
Purchases of premises and equipment and branch bank property, net of disposals	(11,250)	(5,166)
Net cash used in investing activities	(346,545)	(545,333)
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	401,440	393,262
Net decrease in time deposits	(91,898)	(123,400)
Net increase (decrease) in short-term borrowings	(4,342)	47,132
Repayment of FHLB advances	0	(34,289)
Cash dividends paid	(21,647)	(17,658)
Proceeds from issuance of common stock, net of issuance costs	76,175	53,925
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	1,211	517
Cash paid for payroll taxes upon conversion of restricted stock units	(701)	(379)
Net cash provided by financing activities	360,238	319,110
Net increase (decrease) in cash and cash equivalents	71,350	(163,025)
Cash and cash equivalents at beginning of period	310,788	656,135
Cash and cash equivalents at end of period	382,138	493,110
Supplemental Disclosure of Cash Flow Information:
Interest paid	11,305	13,888
Loans transferred to other real estate and repossessed assets	7,870	4,528
Closed branch offices transferred to other real estate	0	382
Income Taxes Paid, Net	$ 19,900	$ 12,950