Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 9,168	$ 8,909
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,282	1,246
Loss (gain) on sale of other real estate owned	(63)	193
Writedown of other real estate owned	157	384
Provision for loan losses	2,000	3,100
Deferred tax (benefit) expense	558	437
Stock based compensation expense	88	90
Net gain on sale of bank premises and equipment	(16)	0
Net gain on sales and calls of securities	(2)	(677)
Increase in taxes receivable	(2,525)	(1,934)
Decrease (increase) in interest receivable	(723)	2,106
Increase in interest payable	7	0
Decrease (increase) in other assets	(530)	(160)
Decrease in accrued expenses and other liabilities	(1,623)	(2,155)
Total adjustments	(1,390)	2,630
Net cash provided by operating activities	7,778	11,539
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	108,997	272,582
Proceeds from calls and maturities of held to maturity securities	25,453	47,650
Purchases of securities available for sale	(287,328)	(444,091)
Proceeds from maturities of securities available for sale	10,000	400
Purchases of held to maturity securities	0	(10,303)
Net increase in loans	(24,457)	(8,680)
Proceeds from dispositions of other real estate owned	1,898	3,371
Proceeds from dispositions of bank premises and equipment	16	0
Purchases of bank premises and equipment	(830)	(1,339)
Net cash used in investing activities	(166,251)	(140,410)
Cash flows from financing activities:
Net increase in deposits	53,487	115,377
Net increase in short-term borrowings	11,173	11,439
Proceeds from sale of treasury stock	735	724
Dividends paid	(6,164)	(6,131)
Net cash provided by financing activities	59,231	121,409
Net decrease in cash and cash equivalents	(99,242)	(7,462)
Cash and cash equivalents at beginning of period	544,016	532,943
Cash and cash equivalents at end of period	444,774	525,481
Cash paid during the year for:
Interest paid	3,858	5,909
Income taxes paid	8,065	7,184
Other non cash items:
Transfer of loans to other real estate owned	3,154	2,387
Increase in dividends payable	9	8
Change in unrealized gain (loss) on securities available for sale - gross of deferred taxes	(2,941)	4,203
Change in deferred tax effect on unrealized gain (loss) on securities available for sale	1,173	(1,676)
Amortization of net actuarial loss and prior service credit on pension and postretirement plans	66	31
Change in deferred tax effect of amortization of net actuarial loss and prior service credit	$ (25)	$ (12)