Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net income	$ 27,437	$ 26,240
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,000	9,000
Gains on sales of loans	(4,565)	(4,143)
Proceeds from sales of loans	134,908	162,143
Loans originated for sale	(121,858)	(151,807)
Net gains on sales of other real estate and repossessed assets	(1,009)	(941)
Depreciation of premises and equipment	4,373	4,019
Amortization of intangible assets	1,994	2,068
Gain on sale of investment securities	(1,104)	0
Net amortization of premiums and discounts on investment securities	1,954	2,601
Share-based compensation expense	1,381	786
Contributions to defined benefit pension plan	(15,000)	(12,000)
Net decrease in interest receivable and other assets	9,425	13,471
Net increase (decrease) in interest payable and other liabilities	(2,360)	380
Net cash provided by operating activities	41,576	51,817
Investment securities – available-for-sale:
Proceeds from sales	38,028	0
Proceeds from maturities, calls and principal reductions	82,474	125,613
Purchases	(276,460)	(140,529)
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	38,298	34,338
Purchases	(83,137)	(63,944)
Net increase in loans	(179,526)	(149,113)
Proceeds from sales of other real estate and repossessed assets	8,902	10,350
Purchases of premises and equipment and branch bank property, net of disposals	(2,676)	(5,404)
Net cash used in investing activities	(374,097)	(188,689)
Financing Activities
Net increase (decrease) in interest- and noninterest-bearing demand deposits and savings accounts	(14,620)	81,196
Net decrease in time deposits	(92,638)	(64,509)
Net increase (decrease) in short-term borrowings	36,532	(4,038)
Repayment of FHLB advances	(34,289)	(4,880)
Cash dividends paid	(11,584)	(11,006)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	321	240
Shares issued, net of shares withheld, for restricted stock units	(379)	(248)
Net cash used in financing activities	(116,657)	(3,245)
Net decrease in cash and cash equivalents	(449,178)	(140,117)
Cash and cash equivalents at beginning of period	656,135	381,940
Cash and cash equivalents at end of period	206,957	241,823
Supplemental Disclosure of Cash Flow Information:
Interest paid	9,528	12,882
Loans transferred to other real estate and repossessed assets	3,083	7,434
Closed branch offices transferred to other real estate	382	0
Federal income taxes paid	$ 5,700	$ 1,350