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Income Taxes (Details 2)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 21.00% 35.00% 35.00%
Increase (decrease) due to      
State income taxes 5.83% 3.41% 5.57%
Deferred tax adjustment related to Tax Act   7.85%  
Tax exempt interest and dividend income (1.13%) (0.61%) (0.98%)
Stock-based compensation expense 0.01% 0.01% 0.01%
Other (0.28%) 0.38% (1.01%)
Effective tax rates 25.43% 46.04% 38.59%