Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 29,183	$ 27,728
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,797	3,776
Loss (gain) on sale of other real estate owned	(87)	577
Write-down of other real estate owned	1,721	809
Provision for loan losses	5,500	9,000
Deferred tax benefit	(360)	(18)
Stock based compensation expense	246	268
Net gain on sale of bank premises and equipment	(16)	(2)
Net gain on sales and calls of securities	(1,434)	(1,398)
Increase in taxes receivable	2,747	1,530
Decrease in interest receivable	52	1,249
Decrease in interest payable	(11)	(295)
Decrease in other assets	6,292	1,680
Increase in accrued expenses and other liabilities	1,634	1,030
Total adjustments	20,081	18,206
Net cash provided by operating activities	49,264	45,934
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	355,678	906,211
Proceeds from calls and maturities of held to maturity securities	52,148	70,640
Purchases of securities available for sale	(389,877)	(1,039,173)
Proceeds from maturities of securities available for sale	10,052	2,416
Purchases of held to maturity securities	0	(10,303)
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(868)	(628)
Net increase in loans	(165,626)	(107,552)
Proceeds from dispositions of other real estate owned	6,929	7,749
Proceeds from dispositions of bank premises and equipment	16	2
Purchases of bank premises and equipment	(5,306)	(4,021)
Net cash used in investing activities	(136,854)	(174,659)
Cash flows from financing activities:
Net increase in deposits	90,175	40,480
Net increase in short-term borrowings	25,380	14,188
Proceeds from sale of treasury stock	2,188	2,176
Dividends paid	(18,520)	(18,418)
Net cash provided by financing activities	99,223	38,426
Net decrease in cash and cash equivalents	11,633	(90,299)
Cash and cash equivalents at beginning of period	544,016	532,943
Cash and cash equivalents at end of period	555,649	442,644
Cash paid during the year for:
Interest paid	11,446	16,238
Income taxes paid	14,691	15,127
Other non cash items:
Transfer of loans to other real estate owned	9,685	12,561
Transfer of building to other assets	3,189	0
Increase in dividends payable	26	25
Change in unrealized gain (loss) on securities available for sale - gross of deferred taxes	(29,227)	12,166
Change in deferred tax effect on unrealized gain (loss) on securities available for sale	11,654	(4,851)
Amortization of net actuarial loss and prior service credit on pension and postretirement plans	153	96
Change in deferred tax effect of amortization of net actuarial loss and prior service credit	$ (61)	$ (39)