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Loans and Asset Quality Information (Schedule of Carrying Amount of Covered Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  | $ 1,167
Impaired Purchased Loans - Unpaid Principal Balance |  | 2,883
Nonimpaired Purchased Loans - Carrying Value |  | 98,356
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 112,750
Total Covered Loans - Carrying Value |  | 99,523
Total Covered Loans - Unpaid Principal Balance |  | 115,633
Commercial, financial, and agricultural [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  |
Impaired Purchased Loans - Unpaid Principal Balance |  |
Nonimpaired Purchased Loans - Carrying Value |  | 743
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 748
Total Covered Loans - Carrying Value |  | 743
Total Covered Loans - Unpaid Principal Balance |  | 748
Real estate - construction, land development & other land loans [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  | 207
Impaired Purchased Loans - Unpaid Principal Balance |  | 332
Nonimpaired Purchased Loans - Carrying Value |  | 3,435
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 3,384
Total Covered Loans - Carrying Value |  | 3,642
Total Covered Loans - Unpaid Principal Balance |  | 3,716
Real estate mortgage residential (1-4 family) first mortgages [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  | 80
Impaired Purchased Loans - Unpaid Principal Balance |  | 564
Nonimpaired Purchased Loans - Carrying Value |  | 73,531
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 85,962
Total Covered Loans - Carrying Value |  | 73,611
Total Covered Loans - Unpaid Principal Balance |  | 86,526
Real estate mortgage home equity loans / lines of credit [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  | 7
Impaired Purchased Loans - Unpaid Principal Balance |  | 14
Nonimpaired Purchased Loans - Carrying Value |  | 10,128
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 11,516
Total Covered Loans - Carrying Value |  | 10,135
Total Covered Loans - Unpaid Principal Balance |  | 11,530
Real estate mortgage commercial and other [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  | 873
Impaired Purchased Loans - Unpaid Principal Balance |  | 1,973
Nonimpaired Purchased Loans - Carrying Value |  | 10,514
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 11,105
Total Covered Loans - Carrying Value |  | 11,387
Total Covered Loans - Unpaid Principal Balance |  | 13,078
Installment loans to individuals [Member] |  |
Covered loans: |  |
Impaired Purchased Loans - Carrying Value |  |
Impaired Purchased Loans - Unpaid Principal Balance |  |
Nonimpaired Purchased Loans - Carrying Value |  | 5
Nonimpaired Purchased Loans - Unpaid Principal Balance |  | 35
Total Covered Loans - Carrying Value |  | 5
Total Covered Loans - Unpaid Principal Balance |  | $ 35

X
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- Definition Reflects the adjusted carrying amount of loans for which it is probable, based on current facts and circumstances, that a creditor will not initially be able to collect all amounts due according to the contractual terms of the loan agreement, or will not recover the previously reported carrying amount of the loan covered by loss sharing arrangements. + References No definition available. + Details
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