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Loans and Allowance for Loan Losses - Loans, Modified As Troubled Debt Restructurings within the Previous Twelve Months, That Became Over 30 Days Past Due (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Commercial Loans [Member] \| Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Commercial Loans [Member] \| Vacant land, land development and residential construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Commercial Loans [Member] \| Real estate - owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Commercial Loans [Member] \| Real estate - non-owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Commercial Loans [Member] \| Real estate - multi-family and residential rental [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Retail Loans [Member] \| Home equity and other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Retail Loans [Member] \| 1 - 4 family mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0	0
Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0