Fair Value Measurement, Estimated Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and short-term investments	$ 53,672	$ 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	54,024	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	49,308	47,404
Restricted investments	1,462	2,337
Net Loans	446,990	443,045
Accrued interest receivable	1,386	1,283
Interest rate swaps	54	0
BOLI	12,335	12,038
Total assets at fair value	511,535	506,107
Liabilities [Abstract]
Deposits	524,356	517,811
Borrowings	13,040	28,877
Company obligated mandatorily redeemable capital securities	4,114	5,258
Accrued interest payable	223	312
Interest rate swaps	345	841
Total liabilities at fair value	542,078	553,099
Significant Other Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and short-term investments	0	0
Securities available for sale	440	325
Restricted investments	0	0
Net Loans	257	377
Accrued interest receivable	0	0
Interest rate swaps	0	0
BOLI	0	0
Total assets at fair value	697	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	53,660	64,435
Securities available for sale	50,100	48,092
Restricted investments	1,462	2,337
Net Loans	448,524	445,108
Accrued interest receivable	1,386	1,283
Interest rate swaps	54	0
BOLI	12,335	12,038
Total assets at fair value	567,521	573,293
Liabilities [Abstract]
Deposits	522,803	515,134
Borrowings	13,155	28,200
Company obligated mandatorily redeemable capital securities	4,124	4,124
Accrued interest payable	223	312
Interest rate swaps	345	841
Total liabilities at fair value	540,650	548,611
Fair Value [Member]
Financial assets [Abstract]
Cash and short-term investments	53,672	64,465
Securities available for sale	50,100	48,092
Restricted investments	1,462	2,337
Net Loans	447,247	443,422
Accrued interest receivable	1,386	1,283
Interest rate swaps	54	0
BOLI	12,335	12,038
Total assets at fair value	566,256	571,637
Liabilities [Abstract]
Deposits	524,356	517,811
Borrowings	13,040	28,877
Company obligated mandatorily redeemable capital securities	4,114	5,258
Accrued interest payable	223	312
Interest rate swaps	345	841
Total liabilities at fair value	$ 542,078	$ 553,099