Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 11,354	$ 10,911
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	700	500
Depreciation and amortization	1,464	1,396
Amortization of investment security premiums and accretion of discounts, net	1,794	3,185
Stock option expense	127	128
Net gains on sales of investment securities	(422)	(1,047)
Net gains on sale of loans	0	(28)
Net (gains) losses on sale of premises, equipment and other assets	(1,083)	16
Gains on sale of other real estate owned	(7)	(33)
Equity in losses of real estate limited partnerships, net	1,189	1,324
Changes in assets and liabilities:
Increase in interest receivable	545	274
Increase in other assets	(870)	(2,794)
Increase (decrease) in interest payable	2,345	(91)
(Decrease) increase in other liabilities	(12,440)	9,636
Net cash provided by operating activities	4,696	23,377
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of investment securities available for sale	64,336	132,025
Proceeds from maturities of investment securities available for sale	146,762	146,328
Proceeds from maturities of investment securities held to maturity	115	192
Proceeds from redemption of Federal Home Loan Bank stock	485	0
Purchases of investment securities available for sale	(225,450)	(229,110)
Loan originations in excess of principal payments	(45,366)	(97,839)
Proceeds from sales of loans, net	0	80
Proceeds from sale of other assets	334	0
Proceeds from sale of premises and equipment	788	51
Proceeds from sales of other real estate owned	505	224
Real estate limited partnership investments	(1,299)	(1,310)
Purchases of bank premises and equipment	(2,522)	(1,173)
Net cash used in investing activities	(61,312)	(50,532)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	75,083	73,363
Net increase in short-term borrowings	55,600	49
Net decrease in securities sold under agreement to repurchase, short term	(34,531)	(9,855)
Principal payments on long-term debt	(20,059)	(8,558)
Cash dividends paid	(4,730)	(4,652)
Sale of treasury stock	15	12
Increase in deferred compensation arrangements	160	153
Proceeds from exercise of stock options, net of withholding taxes	278	0
Tax benefit from exercise of stock options	20	0
Net cash provided by financing activities	71,836	50,512
Increase in cash and cash equivalents	15,220	23,357
Cash and cash equivalents beginning of period	37,812	74,026
Cash and cash equivalents end of period	53,032	97,383
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Total interest payments	3,110	6,730
Total income tax payments	4,350	850
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Distribution of stock under deferred compensation arrangements	391	432
Distribution of treasury stock in lieu of cash dividend	518	517
Transfer of loans to other real estate owned	140	340
(Decrease) increase in payable for investments purchased	$ (9,461)	$ 10,056