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Quantitative Information about Financial and Nonfinancial Assets (Detail) (Fair Value on a Nonrecurring, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jun. 30, 2013
Impaired Loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 6,176 |
Valuation Technique | Discounted appraisals | [1]
Unobservable Input | Appraisal adjustments | [2]
OREO | Not covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 3,941 |
Valuation Technique | Discounted appraisals | [1]
Unobservable Input | Appraisal adjustments | [2]
OREO | Covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 4,423 |
Valuation Technique | Discounted appraisals | [1]
Unobservable Input | Appraisal adjustments | [2]
Minimum | Impaired Loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 1.00% |
Minimum | OREO | Not covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 0.00% |
Minimum | OREO | Covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 1.00% |
Maximum | Impaired Loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 102.00% |
Maximum | OREO | Not covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 75.00% |
Maximum | OREO | Covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 70.00% |
Average | Impaired Loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 18.00% |
Average | OREO | Not covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 34.00% |
Average | OREO | Covered by loss share agreements |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted Average | 31.00% |
[1] | Fair value is generally based on appraisals of the underlying collateral.
[2] | Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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