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Other Comprehensive Income (Loss) Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Other Comprehensive Income (Loss) [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax   $ (1,045) $ (4,768) $ 1,064
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net   3,700 (5,800)  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax     0 (501)
Pension plan adjustment $ (432)   (716)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net     1,217  
Accumulated Other Comprehensive Income (Loss), Net   (1,045) (4,768) $ 563
Other Comprehensive Income (Loss), Net of Tax   $ 3,723 $ (4,615)