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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