Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current [Abstract]
Federal	$ 666	$ 210	$ (60)
State	2	2	12
Current income tax expense	668	212	(48)
Deferred [Abstract]
Federal	472	500	(87)
State	583	420	142
Deferred income tax expense	1,055	920	55
Total income tax expense	1,723	1,132	7
Deferred tax assets [Abstract]
Allowance for loan losses	3,847	4,610
Deferred compensation	382	440
Retirement compensation	1,311	1,218
Stock option compensation	349	350
Post retirement benefits	440	330
Current state franchise taxes	0	1
Non-accrual interest	51	9
Net operating loss	507	734
Tax credit carryovers	2,428	2,751
Other	345	311
Deferred tax assets	9,660	10,754
Deferred tax liabilities [Abstract]
Fixed assets depreciation	1,055	1,173
FHLB dividends	260	260
Tax credit - loss on pass-through	297	313
Deferred loan costs	502	525
Investment securities unrealized gains	1,223	505
Current state franchise benefit	8	0
Total deferred tax liabilities	3,345	2,776
Net deferred tax assets (see Note 7)	6,315	7,978
State net operating loss carryforwards	7,100
Operating loss carryforwards, expiration dates	2028 through 2029
Tax credit carryforwards	2,500
Tax credit carryforward expiry dates	2027 through 2031
Reconciliation of income taxes computed at federal statutory rate and provision for income taxes [Abstract]
Federal statutory income tax rate (in hundredths)	34.00%
Income tax expense at statutory rates	2,166	1,290	908
Reduction for tax exempt interest	(166)	(173)	(290)
State franchise tax, net of federal benefit	408	213	102
Cash surrender value of life insurance	(155)	(149)	(139)
Solar credit amortization	(359)	(323)	(387)
Other	(171)	274	(187)
Total income tax expense	1,723	1,132	7
Reconciliation of unrecognized tax benefits [Roll Forward]
Beginning Balance	83
Additions for tax positions taken in the current period	1
Reductions for tax positions taken in the current period	0
Additions for tax positions taken in prior years	47
Reductions for tax positions taken in prior years	0
Decreases related to settlements with taxing authorities	(79)
Decreases as a result of a lapse in statue of limitations	0
Ending Balance	52	83
Unrecognized interest and penalties	$ 18
Internal Revenue Service (IRS) [Member]
Reconciliation of unrecognized tax benefits [Roll Forward]
Tax year subject to examination	2008
Tax year subject to examination	2009
Tax year subject to examination	2010
Tax year subject to examination	2011
California Franchise Tax Board [Member]
Reconciliation of unrecognized tax benefits [Roll Forward]
Tax year subject to examination	2007
Tax year subject to examination	2008
Tax year subject to examination	2009
Tax year subject to examination	2010
Tax year subject to examination	2011