Carrying Amounts and Estimated Fair Values of Banks Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financial assets:
Cash and interest bearing balances due from banks	$ 29,043	$ 55,500	$ 18,041	$ 28,096
Loans, net	319,676	181,162
Loans held for sale	417	237
Accrued interest receivable	1,953	1,085
Financial liabilities:
Deposits	440,310	290,553
Securities sold under agreements to repurchase	47,314	38,580
Borrowings	58,314	38,580
Carrying (Reported) Amount, Fair Value Disclosure
Financial assets:
Cash and interest bearing balances due from banks	19,298	41,725
Bank certificates of deposit	9,745	13,775
Federal Reserve Bank and Federal Home Loan Bank stock	3,161	2,371
Loans, net	317,426	180,310
Loans held for sale	417	237
Accrued interest receivable	1,953	1,085
Financial liabilities:
Deposits	440,310	290,553
Securities sold under agreements to repurchase	47,314	38,580
Borrowings	11,000
Accrued interest payable	554	256
Estimate of Fair Value, Fair Value Disclosure
Financial assets:
Cash and interest bearing balances due from banks	19,298	41,725
Bank certificates of deposit	9,785	13,843
Federal Reserve Bank and Federal Home Loan Bank stock	3,161	2,371
Loans, net	314,817	179,578
Loans held for sale	358	237
Accrued interest receivable	1,953	1,085
Financial liabilities:
Deposits	437,618	288,117
Securities sold under agreements to repurchase	47,314	38,580
Borrowings	10,989
Accrued interest payable	554	256
Fair Value, Inputs, Level 1 \| Estimate of Fair Value, Fair Value Disclosure
Financial assets:
Cash and interest bearing balances due from banks	19,298	41,725
Fair Value, Inputs, Level 2 \| Estimate of Fair Value, Fair Value Disclosure
Financial assets:
Bank certificates of deposit	9,785	13,843
Loans, net	277,965	179,578
Loans held for sale	358	237
Accrued interest receivable	1,953	1,085
Financial liabilities:
Deposits	437,618	288,117
Securities sold under agreements to repurchase	47,314	38,580
Borrowings	10,989
Accrued interest payable	554	256
Fair Value, Inputs, Level 3 \| Estimate of Fair Value, Fair Value Disclosure
Financial assets:
Federal Reserve Bank and Federal Home Loan Bank stock	3,161	2,371
Loans, net	$ 36,852

TGR Financial, Inc. 10-Q/A