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Employee Benefit Plans (Activity under the incentive and non-qualified stock option plans) (Details) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Balance, Beginning of Period, Shares 72,900 68,400 81,400
Options Granted, Shares 0 0 0
Options Exercised, Shares 0 0 0
Options Forfeited, Shares 4,500 6,900 8,500
Balance, End of Period, Shares 68,400 61,500 72,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Balance, Beginning of Period, Weighted Avg. Exercise Price $ 22.62 $ 22.63 $ 22.51
Options Granted, Weighted Avg. Exercise Price $ 0 $ 0 $ 0
Options Exercised, Weighted Avg. Exercise Price $ 0 $ 0 $ 0
Options Forfeited, Weighted Avg. Exercise Price $ 22.58 $ 23.87 $ 21.72
Balance, End of Period, Weighted Avg. Exercise Price $ 22.63 $ 22.49 $ 22.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Total Intrinsic Value Of Options Exercised During The Year $ 0 $ 0 $ 0
Weighted-Average Fair Value Of Options Granted During The Year $ 0 $ 0 $ 0
Options Exercisable, Shares 43,800 42,300 43,600
Options Exercisable, Weighted Avg. Exercise Price $ 22.14 $ 22.03 $ 22.05
Weighted-Average Remaining Life Of Exercisable Options 1 year 9 months 18 days 1 year 3 months 18 days 2 years 6 months
Options Available For Grant 50,000 50,000 50,000