Fair Value Measurement, Estimated Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and short-term investments	$ 62,500	$ 64,465
Securities available for sale	352	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	62,852	64,828
Liabilities [Abstract]
Deposits	0	0
Borrowings	0	0
Company obligated mandatorily redeemable capital securities		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	0	0
Securities available for sale	47,898	47,404
Restricted investments	1,462	2,337
Net Loans	435,430	443,045
Accrued interest receivable	1,359	1,283
Interest rate swaps	54	0
BOLI	12,238	12,038
Total assets at fair value	498,441	506,107
Liabilities [Abstract]
Deposits	521,052	517,811
Borrowings	13,032	28,877
Company obligated mandatorily redeemable capital securities	4,117	5,258
Accrued interest payable	268	312
Interest rate swaps	343	841
Total liabilities at fair value	538,812	553,099
Significant Other Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and short-term investments	0	0
Securities available for sale	355	325
Restricted investments	0	0
Net Loans	296	377
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total assets at fair value	651	702
Liabilities [Abstract]
Deposits	0	0
Borrowings	0	0
Company obligated mandatorily redeemable capital securities		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	62,500	64,435
Securities available for sale	48,605	48,092
Restricted investments	1,462	2,337
Net Loans	436,084	445,108
Accrued interest receivable	1,359	1,283
Interest rate swaps	54	0
BOLI	12,238	12,038
Total assets at fair value	562,302	573,293
Liabilities [Abstract]
Deposits	519,329	515,134
Borrowings	13,170	28,200
Company obligated mandatorily redeemable capital securities	4,124	4,124
Accrued interest payable	268	312
Interest rate swaps	343	841
Total liabilities at fair value	537,234	548,611
Fair Value [Member]
Financial assets [Abstract]
Cash and short-term investments	62,500	64,465
Securities available for sale	48,605	48,092
Restricted investments	1,462	2,337
Net Loans	435,726	443,422
Accrued interest receivable	1,359	1,283
Interest rate swaps	54	0
BOLI	12,238	12,038
Total assets at fair value	561,944	571,637
Liabilities [Abstract]
Deposits	521,052	517,811
Borrowings	13,032	28,877
Company obligated mandatorily redeemable capital securities	4,117	5,258
Accrued interest payable	268	312
Interest rate swaps	343	841
Total liabilities at fair value	$ 538,812	$ 553,099