Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Recurring [Member]	Dec. 31, 2011 Recurring [Member]	Dec. 31, 2012 Recurring [Member] Level 1 [Member]	Dec. 31, 2011 Recurring [Member] Level 1 [Member]	Dec. 31, 2012 Recurring [Member] Level 2 [Member]	Dec. 31, 2011 Recurring [Member] Level 2 [Member]	Dec. 31, 2012 Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Non-recurring [Member]	Dec. 31, 2011 Non-recurring [Member]	Dec. 31, 2012 Non-recurring [Member] Level 1 [Member]	Dec. 31, 2011 Non-recurring [Member] Level 1 [Member]	Dec. 31, 2012 Non-recurring [Member] Level 2 [Member]	Dec. 31, 2011 Non-recurring [Member] Level 2 [Member]	Dec. 31, 2012 Non-recurring [Member] Level 3 [Member]	Dec. 31, 2011 Non-recurring [Member] Level 3 [Member]
Fair Value Measurement [Abstract]
Number of levels	3
Assets Recorded at Fair Value on a Recurring Basis [Abstract]
U.S. Treasury securities		$ 1,005	$ 2,314	$ 1,005	$ 2,314	$ 0	$ 0	$ 0	$ 0
Securities of U.S. government agencies and corporations		28,305	37,014	0	0	28,305	37,014	0	0
Obligations of states and political subdivisions		28,786	20,617	0	0	28,786	20,617	0	0
Collateralized mortgage obligations		8,278		0		8,278		0
Mortgage-backed securities		118,117	100,296	0	0	118,117	100,296	0	0
Total investments at fair value		184,491	160,241	1,005	2,314	183,486	157,927	0	0
Assets Recorded at Fair Value on a Non-recurring Basis [Abstract]
Impaired loans										2,513	4,008	0	0	0	0	2,513	4,008
Other real estate owned										1,062	1,001	0	0	0	0	1,062	1,001
Loan servicing rights										1,224	1,289	0	0	0	0	1,224	1,289
Total assets at fair value										$ 4,799	$ 6,298	$ 0	$ 0	$ 0	$ 0	$ 4,799	$ 6,298