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Fair Value Measurements - Schedule of Fair Value of Assets Measured on Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
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Jun. 30, 2013
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Dec. 31, 2012
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Impaired Loans [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
$ 7,775 |
$ 9,412 |
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Mortgage Servicing Rights [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
226 |
214 |
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Other Real Estate Owned [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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25 |
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Level I [Member] | Impaired Loans [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level I [Member] | Mortgage Servicing Rights [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level I [Member] | Other Real Estate Owned [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level II [Member] | Impaired Loans [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level II [Member] | Mortgage Servicing Rights [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level II [Member] | Other Real Estate Owned [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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Level III [Member] | Impaired Loans [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
7,775 |
9,412 |
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Level III [Member] | Mortgage Servicing Rights [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
226 |
214 |
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Level III [Member] | Other Real Estate Owned [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total Assets |
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$ 25 |