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Employee Benefit Plans (Stock Option Plans) (Details)
12 Months Ended
Jun. 30, 2006
Dec. 31, 2015
USD ($)
stock_option_plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Mar. 31, 2014
USD ($)
shares
Mar. 31, 2012
USD ($)
Mar. 31, 2010
shares
Mar. 31, 2009
shares
Postemployment Benefits [Abstract]                
Incentive and non-qualified stock option plans, number of plans | stock_option_plan   3            
Incentive and non-qualified stock option plans, number of shares authorized             150,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options vested during period, shares   5,200 5,400 5,400        
Options vested during period, shares, weighted average exercise price | $ / shares   $ 23.50 $ 23.50 $ 23.50        
Options outstanding and exercisable, instrinsic value | $   $ 0     $ 0 $ 0    
Compensation expense related to stock options | $   12,700 $ 12,700 $ (2,600)        
Unrecognized compensation cost related to non-vested stock options | $   $ 13,000            
Unrecognized compensation cost related to non-vested stock options, period for recognition   3 years            
Award annual vesting percentage 100.00% 20.00%            
Award expiration period   10 years            
2008 Equity Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for the issuance   50,000     50,000      
2008 Equity Incentive Plan [Member] | Stock Options and SARS [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for the issuance               50,000
2008 Equity Incentive Plan [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for the issuance               50,000