Bank subsidiary (Details 13) (USD $)	3 Months Ended
	Mar. 31, 2014 contract	Mar. 31, 2013 contract
Loan modifications determined to be troubled debt restructurings
Commitments to borrowers whose loan terms are impaired or modified under troubled debt restructuring	$ 300,000
Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	15	11
Pre-modification outstanding recorded investment	2,527,000	2,508,000
Post-modification outstanding recorded investment	2,541,000	2,146,000
Minimum period of payment default of loans determined to be TDRs		90 days
Residential 1-4 family | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	5	4
Pre-modification outstanding recorded investment	921,000	1,122,000
Post-modification outstanding recorded investment	935,000	1,063,000
Home equity line of credit | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	0	4
Pre-modification outstanding recorded investment	0	462,000
Post-modification outstanding recorded investment	0	215,000
Residential land | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	7	3
Pre-modification outstanding recorded investment	1,133,000	924,000
Post-modification outstanding recorded investment	1,133,000	868,000
Commercial loans | Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts	3	0
Pre-modification outstanding recorded investment	473,000	0
Post-modification outstanding recorded investment	$ 473,000	$ 0