The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

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+ Details

Loans and Allowance - Additional Information (Detail) (USD $)				12 Months Ended
	Dec. 31, 2012	Feb. 10, 2012	Dec. 31, 2011	Dec. 31, 2012 Residential	Dec. 31, 2012 Commercial and farm land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loans held for sale	$ 22,300,000		$ 17,864,000
Loan Acquired during acquisition		113,000,000
Fair Value Discount		$ 19,200,000
Percentage of troubled debt restructured loans				15.00%	69.00%