Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows From Operating Activities:
Net Income	$ 12,374	$ 9,188
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	5,000	7,500
Gains on sales of loans	(1,896)	(1,555)
Proceeds from sales of loans	73,162	70,094
Loans originated for sale	(77,528)	(52,093)
Net gains on sales of other real estate and repossessed assets	(305)	(201)
Depreciation of premises and equipment	1,983	2,021
Amortization of intangible assets	1,067	969
Net amortization of premiums and discounts on investment securities	1,281	824
Share-based compensation expense	314	245
Contributions to defined benefit pension plan	(12,000)
Net decrease in interest receivable and other assets	14,426	4,323
Net decrease in interest payable and other liabilities	(8,716)	(7,282)
Net cash provided by operating activities	9,162	34,033
Investment securities - available-for-sale:
Proceeds from maturities, calls and principal reductions	72,992	103,482
Purchases	(81,537)	(113,996)
Investment securities - held-to-maturity:
Proceeds from maturities, calls and principal reductions	8,515	11,331
Purchases	(16,599)	(8,503)
Net increase in loans	(21,660)	(10,702)
Proceeds from sales of other real estate and repossessed assets	4,145	3,504
Purchases of premises and equipment and branch bank property, net	(2,655)	(1,169)
Net cash used in investing activities	(36,799)	(16,053)
Cash Flows From Financing Activities:
Net increase in noninterest-bearing and interest-bearing demand deposits and savings accounts	129,749	69,042
Net decrease in time deposits	(35,222)	(18,536)
Net increase in short-term borrowings	31,296	43,490
Repayment of FHLB advances	(937)	(1,276)
Cash dividends paid	(5,503)	(5,491)
Proceeds from directors' stock plans	240	245
Shares issued - restricted stock performance units	(248)
Net cash provided by financing activities	119,375	87,474
Net increase in cash and cash equivalents	91,738	105,454
Cash and cash equivalents at beginning of period	381,940	536,165
Cash and Cash Equivalents at End of Period	473,678	641,619
Supplemental Disclosure of Cash Flow Information:
Interest paid	6,577	8,565
Loans transferred to other real estate and repossessed assets	4,299	2,492
Federal income taxes paid (refunded)	$ (8,000)