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Loan Commitments and Other Related Activities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |
Period for commitments and construction loan commitments | 60 days |
Construction loans [Member] |  |
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |
Period for commitments and construction loan commitments | 1 year |
Minimum [Member] |  |
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |
Interest rates for fixed rate loan commitments | 2.99% | 3.25%
Maturities for fixed rate loan commitments | 16 months | 15 years
Maximum [Member] |  |
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |
Interest rates for fixed rate loan commitments | 5.00% | 5.25%
Maturities for fixed rate loan commitments | 30 years | 30 years

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- Details
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- Definition Fixed Rate Loan Commitments Expiration Period + References No definition available. + Details
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- Definition Fixed Rate Of Interest On Loans + References No definition available. + Details
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- Definition Term In Years Of Interest Only Loans Offered As Fixed Rate Loans + References No definition available. + Details
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