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Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	$ 6,480	$ 8,935
OREO \| Not covered by loss share agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	5,462	7,180
OREO \| Covered by loss share agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	5,247	6,433
Level 3 \| Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	6,480	8,935
Level 3 \| OREO \| Not covered by loss share agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	5,462	7,180
Level 3 \| OREO \| Covered by loss share agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	$ 5,247	$ 6,433