Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net income	$ 13,813	$ 13,234
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,600	3,000
Gains on sales of loans	(647)	(2,394)
Proceeds from sales of loans	22,080	71,205
Loans originated for sale	(20,028)	(65,996)
Net gains on sales of other real estate and repossessed assets	(379)	(235)
Depreciation of premises and equipment	2,119	2,177
Amortization of intangible assets	695	1,001
Gain on sale of investment securities	0	(847)
Net amortization of premiums and discounts on investment securities	1,093	863
Share-based compensation expense	554	629
Contributions to defined benefit pension plan	0	(15,000)
Net (increase) decrease in interest receivable and other assets	(1,319)	7,154
Net increase (decrease) in interest payable and other liabilities	1,239	(7,837)
Net cash provided by operating activities	20,820	6,954
Investment securities – available-for-sale:
Proceeds from sales	0	33,028
Proceeds from maturities, calls and principal reductions	28,426	41,165
Purchases	0	(191,165)
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	31,798	7,111
Purchases	(36,309)	(34,940)
Net increase in loans	(109,965)	(24,374)
Proceeds from sales of other real estate and repossessed assets	2,197	2,701
Purchases of premises and equipment and branch bank property, net of disposals	(1,590)	(602)
Net cash used in investing activities	(85,443)	(167,076)
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	78,246	125,946
Net increase (decrease) in time deposits	30,662	(40,031)
Net increase in short-term borrowings	33,803	37,021
Repayment of FHLB advances	0	(34,289)
Cash dividends paid	(6,881)	(5,791)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	867	229
Cash paid for payroll taxes upon conversion of restricted stock units	(477)	(372)
Net cash provided by financing activities	136,220	82,713
Net increase (decrease) in cash and cash equivalents	71,597	(77,409)
Cash and cash equivalents at beginning of period	310,788	656,135
Cash and cash equivalents at end of period	382,385	578,726
Supplemental Disclosure of Cash Flow Information:
Interest paid	3,858	4,890
Loans transferred to other real estate and repossessed assets	2,098	2,191
Closed branch offices transferred to other real estate	0	382
Federal income taxes paid (refunded)	$ 0	$ (3,500)