Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 15,194	$ 14,620	$ 15,461
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (credit) for loan losses	950	750	(1,750)
Deferred tax expense	772	(1,337)	205
Depreciation and amortization	1,948	1,891	1,700
Amortization of investment security premiums and accretion of discounts, net	2,330	3,858	4,827
Stock option expense	172	164	101
Contribution to pension plan	(5,000)	0	0
Net gains on sales of investment securities	(507)	(1,049)	(2,082)
Other-than-temporary impairment losses on investment securities	0	55	169
Net gains on sale of loans	0	(25)	(12)
Net (gains) losses on sale of premises, equipment and other assets	(1,040)	119	23
Gains on sale of other real estate owned	(7)	(50)	(537)
Equity in losses of real estate limited partnerships, net	1,516	1,766	1,672
Changes in assets and liabilities:
Net change in interest receivable	753	(129)	(211)
Net change in other assets	(2,333)	2,130	(877)
Net change in interest payable	2,196	(96)	(467)
Net change in other liabilities	(11,282)	8,726	(5,888)
Net cash provided by operating activities	5,662	31,393	12,334
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of investment securities available for sale	129,936	131,858	58,477
Proceeds from maturities of investment securities available for sale	186,540	181,385	245,890
Proceeds from maturities of investment securities held to maturity	151	236	365
Proceeds from redemption of Federal Home Loan Bank stock	485	0	0
Purchases of investment securities available for sale	(316,251)	(358,906)	(366,816)
Loan originations (in excess of) less than principal payments	(55,428)	(117,536)	7,467
Proceeds from sales of loans, net	0	80	290
Proceeds from sale of other assets	334	0	0
Proceeds from sale of premises and equipment	788	52	4
Proceeds from sales of other real estate owned	505	380	1,801
Real estate limited partnership investments	(1,750)	(1,702)	(1,705)
Purchases of bank premises and equipment	(3,877)	(1,929)	(3,001)
Net cash used in investing activities	(58,567)	(166,082)	(57,228)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	93,200	85,684	48,877
Net (decrease) increase in short-term borrowings	0	(2,964)	1,561
Net increase in securities sold under agreement to repurchase, short-term	24,993	37,834	46,378
Net decrease in securities sold under agreement to repurchase, long-term	0	(7,500)	(46,500)
Principal payments on long-term debt	(20,079)	(8,577)	(76)
Cash dividends paid	(6,324)	(6,233)	(6,139)
Sale of treasury stock	18	14	10
Increase in deferred compensation arrangements	213	216	202
Proceeds from exercise of stock options, net of withholding taxes	280	0	59
Tax benefit from exercise of stock options	20	1	2
Net cash provided by (used in) financing activities	92,321	98,475	44,374
Increase (decrease) in cash and cash equivalents	39,416	(36,214)	(520)
Cash and cash equivalents beginning of period	37,812	74,026	74,546
Cash and cash equivalents end of period	77,228	37,812	74,026
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Total interest payments	4,687	8,739	11,575
Total income tax payments	5,950	1,950	8,400
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Distribution of stock under deferred compensation arrangements	391	432	455
Distribution of treasury stock in lieu of cash dividend	683	719	762
Non-cash exercise of stock options	130	124	0
Transfer of loans to other real estate owned	140	497	800
(Decrease) increase in payable for investments purchased	$ (9,461)	$ 9,461	$ (3,000)