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Fair Value Measurements - Additional Information (Detail) (USD $)
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12 Months Ended | |||
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Dec. 31, 2012
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Tax credit to be received | 2 years | |||
| Percentage of decline in bond value | 1.60% | |||
| Loans Held for Sale | $ 8,306,000 | $ 6,043,000 | $ 55,993,000 | $ 22,587,000 |
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Zero Coupon Municipal Bond [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Zero coupon tax credit municipal bond, recorded at estimated fair value | 779,000 | 774,000 | ||
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Significant Observable Inputs With No Active Market With Identical Characteristics [Member] | Nonrecurring Basis [Member] | Nonperforming loans held for sale [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Loans Held for Sale | 484,000 | 2,300,000 | ||
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Significant Observable Inputs With No Active Market With Identical Characteristics [Member] | Small Business Administration Loans Held for Sale [Member] | Nonrecurring Basis [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Loans Held for Sale | $ 7,800,000 | $ 3,700,000 |
| X | ||||||||||
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- Definition
Percentage Of Changes In Bond Value No definition available.
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| X | ||||||||||
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- Definition
Tax Credit Carry Forward Period Years No definition available.
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- Details
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- Definition
This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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