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Earnings Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic Net Income per Common Share Available to Common Stockholders [Abstract]                      
Net income $ 6,797,000 $ 5,308,000 $ 4,929,000 $ 4,806,000 $ 4,654,000 $ 3,663,000 $ 4,156,000 $ 4,039,000 $ 21,840,000 $ 16,512,000 $ 15,461,000
Preferred stock dividends                 (825,000) (2,200,000) (4,152,000)
Net income available to common stockholders $ 6,797,000 $ 5,308,000 $ 4,654,000 $ 4,256,000 $ 4,104,000 $ 3,113,000 $ 3,606,000 $ 3,489,000 $ 21,015,000 $ 14,312,000 $ 11,309,000
Weighted average common shares outstanding                 10,149,099 7,775,490 6,002,766
Basic earnings per common share $ 0.55 $ 0.51 $ 0.51 $ 0.50 $ 0.49 $ 0.37 $ 0.50 $ 0.50 $ 2.07 $ 1.84 $ 1.88
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]                      
Net income available to common stockholders $ 6,797,000 $ 5,308,000 $ 4,654,000 $ 4,256,000 $ 4,104,000 $ 3,113,000 $ 3,606,000 $ 3,489,000 $ 21,015,000 $ 14,312,000 $ 11,309,000
Effect of assumed preferred stock conversion                 825,000 2,200,000 4,152,000
Net income applicable to diluted earnings per share                 $ 21,840,000 $ 16,512,000 $ 15,461,000
Weighted average common shares outstanding                 10,149,099 7,775,490 6,002,766
Dilutive potential common shares [Abstract]                      
Assumed conversion of stock options                 3,111 0 0
Restricted stock awarded                 4,107 6,851 11,725
Assumed conversion of preferred stock                 507,393 1,355,348 2,357,196
Dilutive potential common shares                 514,611 1,362,199 2,368,921
Diluted weighted average common shares outstanding                 10,663,710 9,137,689 8,371,687
Diluted earnings per common share $ 0.55 $ 0.51 $ 0.50 $ 0.49 $ 0.48 $ 0.37 $ 0.49 $ 0.48 $ 2.05 $ 1.81 $ 1.85
Stock options to purchase shares of common stock                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)                 0 45,500 52,000