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Related Party Transactions (Narrative) (Detail) (USD $)	12 Months Ended
Related Party Transactions (Narrative) (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Deposits from related parties	$ 6,155,000	$ 5,070,000
Executive Officers And Directors And Their Affiliates [Member]
Related Party Transaction [Line Items]
Loans and leases receivable, related parties	750,000	1,381,000
Total principal additions on loan	252,000	931,000	67,000
Total principal payments on loan	883,000	317,000	444,000
Related party, unfunded commitments	$ 390,000	$ 131,000

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.