Fair Value Measurement, Estimated Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and short-term investments	$ 61,935	$ 69,660
Securities available for sale	363	349
Restricted investments	0	0
Net Loans	0	0
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total financial assets	62,298	70,009
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 financial liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and short-term investments	2,530	2,547
Securities available for sale	47,404	46,965
Restricted investments	2,337	2,543
Net Loans	443,045	461,564
Accrued interest receivable	1,283	1,534
Interest rate swaps	0	179
BOLI	12,038	11,621
Total financial assets	508,637	526,953
Liabilities [Abstract]
Deposits	517,811	535,567
Borrowings	28,876	26,023
Company obligated mandatorily redeemable capital securities	5,258	4,982
Accrued interest payable	312	401
Interest rate swaps	841	452
Total financial liabilities	553,098	567,425
Significant Other Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and short-term investments	0	0
Securities available for sale	325	335
Restricted investments	0	0
Net Loans	377	1,885
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total financial assets	702	2,220
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 financial liabilities	0	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and short-term investments	64,435	72,161
Securities available for sale	48,092	47,649
Restricted investments	2,337	2,543
Net Loans	445,108	452,086
Accrued interest receivable	1,283	1,534
Interest rate swaps	0	179
BOLI	12,038	11,621
Total financial assets	573,293	587,773
Liabilities [Abstract]
Deposits	515,134	530,569
Borrowings	28,200	25,000
Company obligated mandatorily redeemable capital securities	4,124	4,124
Accrued interest payable	312	401
Interest rate swaps	841	452
Total financial liabilities	548,611	560,546
Fair Value [Member]
Financial assets [Abstract]
Cash and short-term investments	64,465	72,207
Securities available for sale	48,092	47,649
Restricted investments	2,337	2,543
Net Loans	443,420	463,449
Accrued interest receivable	1,283	1,534
Interest rate swaps	0	179
BOLI	12,038	11,621
Total financial assets	571,637	599,182
Liabilities [Abstract]
Deposits	517,811	535,567
Borrowings	28,876	26,023
Company obligated mandatorily redeemable capital securities	5,258	4,982
Accrued interest payable	312	401
Interest rate swaps	841	452
Total financial liabilities	$ 553,098	$ 567,425