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Estimated Fair Values Estimated Fair Values (Information on Other Real Estate Owned) (Details) (Fair Value, Measurements, Nonrecurring [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Mar. 31, 2011
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Covered OREO [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Current year foreclosures | $ 20,532 | $ 40,800
Loan charge-offs recorded due to the measurement and initial recognition of OREO | 959 | 3,787
Write-downs recorded subsequent to forelosure for OREO | 122 | 4,566
Fair value of OREO remeasured in current year | 21,344 | 48,016
Non-covered OREO [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Current year foreclosures | 6,308 | 6,129
Loan charge-offs recorded due to the measurement and initial recognition of OREO | 458 | 668
Write-downs recorded subsequent to forelosure for OREO | 483 | 749
Fair value of OREO remeasured in current year | $ 8,048 | $ 10,705

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