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	$ 17,747	$ 17,638	$ 15,569
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,134	2,949	3,409
Deferred income tax expense	204	582	563
Depreciation of premises and equipment	764	799	886
Amortization of intangibles	1,083	1,083	1,083
Amortization of premiums and accretion of discounts, net	224	217	300
(Gains) losses on disposal of fixed assets	(3)	1	(5)
(Gains) losses on sale and calls of securities available for sale, net	(10)	26	(19)
(Gains) losses on calls of securities held to maturity, net	(15)	(37)	33
(Gains) losses and writedowns on other real estate owned	(14)	334	63
Originations of mortgage loans held for sale	(22,747)	(13,582)	(21,929)
Sales of mortgage loans held for sale	22,574	13,419	19,595
Net change in:
Accrued interest receivable	57	(288)	234
Other assets	(44)	501	(858)
Accrued interest payable	(67)	(51)	(79)
Other liabilities	(175)	(4,135)	(280)
Net cash provided by operating activities	22,712	19,456	18,565
Cash Flows from Investing Activities
Net change interest-bearing deposits	1,758	(28,955)	(36,670)
Proceeds from repayments of mortgage-backed securities	3,160	3,823	5,817
Proceeds from calls and maturities of securities available for sale	151,051	74,961	68,565
Proceeds from calls and maturities of securities held to maturity	30,942	22,123	39,234
Purchases of securities available for sale	(171,601)	(64,567)	(93,862)
Purchases of securities held to maturity	(47,803)	(35,411)	(41,297)
Purchases of loan participations	1,988	0	(55)
Collections of loan participations	(2,082)	934	876
Loan originations and principal collections, net	(8,182)	(17,081)	7,820
Purchase of bank-owned life insurance	0	(1,900)	0
Proceeds from disposal of other real estate owned	1,699	1,391	2,393
Recoveries on loans charged off	100	84	139
Additions to premises and equipment	(769)	(725)	(728)
Proceeds from sale of premises and equipment	0	2	5
Net cash used in investing activities	(39,739)	(45,321)	(47,763)
Cash Flows from Financing Activities
Net change in time deposits	(33,333)	(21,132)	(35,109)
Net change in other deposits	60,766	55,882	67,580
Cash dividends paid	(7,639)	(6,938)	(6,309)
Stock options exercised	119	92	0
Net cash provided by financing activities	19,913	27,904	26,162
Net change in cash and due from banks	2,886	2,039	(3,036)
Cash and due from banks at beginning of year	11,897	9,858	12,894
Cash and due from banks at end of year	14,783	11,897	9,858
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	7,954	9,235	11,237
Income taxes paid	4,930	4,779	5,478
Supplemental Disclosure of Noncash Activities
Loans charged against the allowance for loan losses	2,953	2,628	2,810
Loans transferred to other real estate owned	1,631	1,491	2,053
Unrealized gains (losses) on securities available for sale	(922)	4,219	(2,658)
Minimum pension liability adjustment	$ (1,258)	$ (2,188)	$ (648)