Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 14,620	$ 15,461	$ 12,479
Adjustments to reconcile net income to net cash provided by Operating activities:
Provision (credit) for loan losses	750	(1,750)	4,100
Deferred tax expense (benefit)	(1,337)	205	(4,941)
Depreciation and amortization	1,891	1,700	1,595
Amortization of investment security premiums and accretion of discounts, net	3,858	4,827	462
Stock option expense	164	101	65
Contribution to pension plan	0	0	(2,300)
Net gains on investment securities	(1,049)	(2,082)	(1,219)
Other-than-temporary impairment losses on investment securities	55	169	0
Gains from sales of loans, net	(25)	(12)	0
Net losses (gains) on disposition of premises and equipment	119	23	(159)
Net gains and expense recoveries on sales of other real estate owned	(50)	(537)	0
Equity in losses of real estate limited partnerships, net	1,766	1,672	2,049
Changes in assets and liabilities:
Increase in interest receivable	(129)	(211)	(242)
Increase in other assets	2,131	(877)	(4,495)
Decrease in interest payable	(96)	(467)	(526)
Increase (decrease) in other liabilities	8,726	(5,888)	5,196
Net cash provided by operating activities	31,394	12,334	12,064
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of investment securities available for sale	131,858	58,477	65,202
Proceeds from maturities of investment securities available for sale	181,385	245,890	105,024
Proceeds from maturities of investment securities held to maturity	236	365	577
Purchases of investment securities available for sale	(358,906)	(366,816)	(141,738)
Loan originations (in excess of) less than principal payments	(117,536)	7,467	(73,160)
Proceeds from sales of loans, net	80	290	0
Purchases of Federal Home Loan Bank stock, net	0	0	(107)
Proceeds from sales of premises and equipment	52	4	254
Proceeds from sales of other real estate owned	380	1,801	188
Real estate limited partnership investments	(1,702)	(1,705)	(1,905)
Purchases of bank premises and equipment	(1,929)	(3,001)	(3,220)
Net cash used in investing activities	(166,082)	(57,228)	(48,885)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	85,684	48,877	112,522
Net (decrease) increase in short-term borrowings	(2,964)	1,561	(30,597)
Proceeds from long-term debt	0	0	1,225
Net increase in securities sold under agreement to repurchase-short term	37,834	46,378	85,907
Net decrease in securities sold under agreement to repurchase-long term	(7,500)	(46,500)	0
Principal payments on long-term debt	(8,577)	(76)	(88,653)
Cash dividends paid	(6,233)	(6,139)	(6,059)
Sale of treasury stock	14	10	4
Increase in deferred compensation arrangements	216	202	179
Proceeds from exercise of stock options, net of withholding taxes	(1)	59	532
Tax benefit from exercise of stock options	1	2	51
Net cash provided by financing activities	98,474	44,374	75,111
(Decrease) increase in cash and cash equivalents	(36,214)	(520)	38,290
Cash and cash equivalents beginning of year	74,026	74,546	36,256
Cash and cash equivalents end of year	37,812	74,026	74,546
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Total interest payments	8,739	11,575	16,750
Total income tax payments	1,950	8,400	4,995
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Distribution of stock under deferred compensation arrangements	432	455	400
Distribution of treasury stock in lieu of cash dividend	719	796	796
Transfer of loans to other real estate owned	497	800	41
Increase (decrease) in payable for investments purchased	$ 9,461	$ (3,000)	$ 3,000