Fair Value Measurement, Estimated Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and short-term investments	$ 60,873	$ 61,935
Securities available for sale	362	363
Restricted investments	0	0
Net Loans	0	0
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total assets at fair value	61,235	62,298
Liabilities [Abstract]
Deposits	0	0
Borrowings	0	0
Company obligated mandatorily redeemable capital securities	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and short-term investments	2,525	2,530
Securities available for sale	45,026	47,404
Restricted investments	2,138	2,337
Net Loans	445,283	443,045
Accrued interest receivable	1,404	1,283
Interest rate swaps	6	0
BOLI	12,138	12,038
Total assets at fair value	508,520	508,637
Liabilities [Abstract]
Deposits	512,147	517,811
Borrowings	28,628	28,877
Company obligated mandatorily redeemable capital securities	4,117	5,258
Accrued interest payable	323	312
Interest rate swaps	736	841
Total liabilities at fair value	545,951	553,099
Significant Other Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and short-term investments	0	0
Securities available for sale	313	325
Restricted investments	0	0
Net Loans	259	377
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total assets at fair value	572	702
Liabilities [Abstract]
Deposits	0	0
Borrowings	0	0
Company obligated mandatorily redeemable capital securities	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and short-term investments	63,372	64,435
Securities available for sale	45,701	48,092
Restricted investments	2,138	2,337
Net Loans	443,591	445,108
Accrued interest receivable	1,404	1,283
Interest rate swaps	6	0
BOLI	12,138	12,038
Total assets at fair value	568,350	573,293
Liabilities [Abstract]
Deposits	509,604	515,134
Borrowings	28,185	28,200
Company obligated mandatorily redeemable capital securities	4,124	4,124
Accrued interest payable	323	312
Interest rate swaps	736	841
Total liabilities at fair value	542,972	548,611
Fair Value [Member]
Financial assets [Abstract]
Cash and short-term investments	63,398	64,465
Securities available for sale	45,701	48,092
Restricted investments	2,138	2,337
Net Loans	445,542	443,422
Accrued interest receivable	1,404	1,283
Interest rate swaps	6	0
BOLI	12,138	12,038
Total assets at fair value	570,327	571,637
Liabilities [Abstract]
Deposits	512,147	517,811
Borrowings	28,628	28,877
Company obligated mandatorily redeemable capital securities	4,117	5,258
Accrued interest payable	323	312
Interest rate swaps	736	841
Total liabilities at fair value	$ 545,951	$ 553,099