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Commitments and Contingencies (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loan commitments:
Unfunded loan commitments amount	$ 7,047,000	$ 3,330,000	$ 2,013,000
Unused lines of credit:
Financial receivable line of credit unused current	19,188,516	19,374,032	19,677,058
Letters of credit:	32,000	32,000	71,762
Construction and land development
Loan commitments:
Unfunded loan commitments amount	822,000	260,000	0
Other mortgage loans
Loan commitments:
Unfunded loan commitments amount	6,225,000	3,070,000	2,013,000
Home-equity lines
Unused lines of credit:
Financial receivable line of credit unused current	9,882,497	9,232,242	8,130,179
Commercial lines
Unused lines of credit:
Financial receivable line of credit unused current	8,615,844	9,368,770	10,738,826
Secured consumer line
Unused lines of credit:
Financial receivable line of credit unused current	3,002	19,175	0
Unsecured consumer lines
Unused lines of credit:
Financial receivable line of credit unused current	$ 687,173	$ 753,845	$ 808,053