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Share-based Payments, Restricted Stock Units (Details) - Restricted Stock [Member]
 12 Months Ended
Mar. 31, 2018
USD ($)
Installment
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Shares [Roll Forward]    
Non-vested at beginning of period (in shares) 126,277  
Granted (in shares) 77,854 62,637
Vested (in shares) (68,869)  
Forfeited (in shares) (1,434)  
Non-vested at end of period (in shares) 133,828 126,277
Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested at beginning of period (in dollars per share) | $ / shares $ 28.26  
Granted (in dollars per share) | $ / shares 27.70  
Vested (in dollars per share) | $ / shares 27.41  
Forfeited (in dollars per share) | $ / shares 28.37  
Non-vested at end of period (in dollars per share) | $ / shares $ 28.37 $ 28.26
Estimated fair value of awards granted | $ $ 2,157,000 $ 1,774,000
Number of equal annual installments in which awards vest | Installment 3  
Number of shares withheld (in shares) 21,361 36,586
Total unrecognized compensation expense, restricted stock | $ $ 2,648,000  
Weighted average vesting period over which compensation expense is expected to be recognized 1 year 10 months 24 days