Loans, Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Allowance for loan losses:
Balance, beginning of year	$ 3,437	$ 2,931
Provision charged to expenses	149	215
Losses charged off	(219)	(388)
Recoveries	37	132
Balance, end of period	3,404	2,890
Individually evaluated for impairment	885	413
Collectively evaluated for impairment	2,519	2,477
Balance, end of period	3,404	2,890
Loans [Abstract]
Individually evaluated for impairment	15,488	17,460
Collectively evaluated for impairment	534,179	439,521
Total gross loans	549,667	456,981	453,783
Commercial and Industrial [Member]
Allowance for loan losses:
Balance, beginning of year	320	162
Provision charged to expenses	20	7
Losses charged off	(83)	0
Recoveries	0	0
Balance, end of period	257	169
Individually evaluated for impairment	71	0
Collectively evaluated for impairment	186	169
Balance, end of period	257	169
Loans [Abstract]
Individually evaluated for impairment	181	2,922
Collectively evaluated for impairment	35,234	27,735
Total gross loans	35,415	30,657
Commercial Secured By Real Estate [Member]
Allowance for loan losses:
Balance, beginning of year	2,296	1,941
Provision charged to expenses	87	61
Losses charged off	(30)	(205)
Recoveries	0	70
Balance, end of period	2,353	1,867
Individually evaluated for impairment	657	263
Collectively evaluated for impairment	1,696	1,604
Balance, end of period	2,353	1,867
Loans [Abstract]
Individually evaluated for impairment	14,006	13,900
Collectively evaluated for impairment	268,838	204,602
Total gross loans	282,844	218,502
Residential Real Estate [Member]
Allowance for loan losses:
Balance, beginning of year	712	656
Provision charged to expenses	14	155
Losses charged off	(27)	(117)
Recoveries	5	7
Balance, end of period	704	701
Individually evaluated for impairment	157	150
Collectively evaluated for impairment	547	551
Balance, end of period	704	701
Loans [Abstract]
Individually evaluated for impairment	1,294	629
Collectively evaluated for impairment	213,190	186,378
Total gross loans	214,484	187,007
Consumer [Member]
Allowance for loan losses:
Balance, beginning of year	108	166
Provision charged to expenses	22	(6)
Losses charged off	(63)	(46)
Recoveries	23	38
Balance, end of period	90	152
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	90	152
Balance, end of period	90	152
Loans [Abstract]
Individually evaluated for impairment	7	9
Collectively evaluated for impairment	13,966	13,375
Total gross loans	13,973	13,384
Agricultural [Member]
Allowance for loan losses:
Balance, beginning of year	0	0
Provision charged to expenses	0	0
Losses charged off	0	0
Recoveries	0	0
Balance, end of period	0	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Balance, end of period	0	0
Loans [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,805	2,357
Total gross loans	1,805	2,357
Other [Member]
Allowance for loan losses:
Balance, beginning of year	1	6
Provision charged to expenses	6	(2)
Losses charged off	(16)	(20)
Recoveries	9	17
Balance, end of period	0	1
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	1
Balance, end of period	0	1
Loans [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,146	5,074
Total gross loans	$ 1,146	$ 5,074