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Activity for Loans (Detail) (Directors and Executive Officers, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Directors and Executive Officers
Related Party Transaction [Line Items]
Balance at beginning of year	$ 19,518	$ 15,310
Principal distributions	1,063	8,319
Repayments of principal	(4,317)	(7,337)
Change in related party status		3,226
Balance at end of year	$ 16,264	$ 19,518

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

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

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