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Stock-based Compensation Plan (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock-based Compensation Plans      
Shares available to grant to employees and directors 2,139,518    
Restricted Stock      
Restricted Stock Awards      
Compensation expense related to awards $ 3,703,000 $ 3,764,000 $ 2,870,000
Income tax benefit related to awards 934,000 1,452,000 1,112,000
Unrecognized compensation expense $ 4,013,000    
Unrecognized compensation expense, recognized over weighted-average period 2 years    
Fair value of awards that vested $ 3,319,000 3,746,000 2,624,000
Tax benefit of awards that vested $ 1,126,000 $ 1,998,000 $ 1,053,000
Average remaining contractual term on non-vested awards 10 months 24 days    
Aggregate intrinsic value of non-vested awards $ 7,210,000