CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK
Balance at Dec. 31, 2010	$ 66,620	$ 33,464	$ 18,064	$ 31,091	$ (9,689)	$ (6,310)
Balance (in shares) at Dec. 31, 2010		4,015,753
Comprehensive income:
Net income	8,967			8,967
Other comprehensive income	8,226				8,226
Dividends declared, ($1.41 and $1.38 per share for the period ended September 30, 2012 and 2011, respectively)	(5,293)			(5,293)
Common shares issued for employee stock purchase plan	52	13	39
Common shares issued for employee stock purchase plan (in shares)		1,498
Balance at Sep. 30, 2011	78,572	33,477	18,103	34,765	(1,463)	(6,310)
Balance (in shares) at Sep. 30, 2011		4,017,251
Balance at Dec. 31, 2011	80,460	33,480	18,115	36,394	(1,219)	(6,310)
Balance (in shares) at Dec. 31, 2011		4,017,677
Comprehensive income:
Net income	10,754			10,754
Other comprehensive income	7,934				7,934
Dividends declared, ($1.41 and $1.38 per share for the period ended September 30, 2012 and 2011, respectively)	(5,411)			(5,411)
Common shares issued for employee stock purchase plan	42	9	33
Common shares issued for employee stock purchase plan (in shares)		1,100
Balance at Sep. 30, 2012	$ 93,779	$ 33,489	$ 18,148	$ 41,737	$ 6,715	$ (6,310)
Balance (in shares) at Sep. 30, 2012		4,018,777