Loans and Allowance for Loan Losses - Changes in Related Party Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Balance, beginning of year	$ 6,922	$ 7,618
Advances	717	5,374
Repayments	(1,041)	(6,070)
Transactions due to changes in related parties	(5,206)
Balance, end of year	$ 1,392	$ 6,922

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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- Definition

Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them.

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- Definition

Reflects the sum for the period of the additions and reductions to related party loans, which when added to the opening balance of related party loan will agree to the ending balance of such loans. This subtotal typically is not reflected.

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