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Quarterly Financial Results (unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                              
Interest income $ 208,085,000 $ 202,167,000 $ 123,743,000 $ 102,143,000 $ 101,493,000 $ 97,380,000 $ 83,762,000 $ 80,974,000 $ 77,797,000 $ 67,192,000 $ 55,503,000 $ 54,679,000 $ 636,138,249 $ 363,608,928 $ 255,169,880
Net interest income 174,731,000 173,182,000 106,627,000 88,767,000 89,413,000 86,635,000 75,044,000 73,902,000 71,475,000 62,059,000 51,831,000 51,269,000 519,643,067 306,666,223 227,444,418
Provision for loan losses 6,281,000 6,920,000 6,812,000 3,651,000 3,046,000 6,108,000 5,280,000 3,894,000 5,459,000 2,228,000 1,186,000 315,000 23,663,944 18,328,058 9,188,497
Net income before taxes 81,965,000 99,503,000 63,074,000 53,444,000 54,345,000 48,693,000 46,546,000 41,800,000 40,432,000 36,134,000 33,917,000 32,617,000 297,986,023 191,383,862 143,097,930
Net income $ 26,798,000 $ 64,442,000 $ 43,086,000 $ 39,653,000 $ 36,097,000 $ 32,377,000 $ 30,787,000 $ 27,964,000 $ 26,854,000 $ 24,149,000 $ 22,665,000 $ 21,843,000 $ 173,979,487 $ 127,224,695 $ 95,509,402
Basic net income per common share (in dollars per share) $ 0.35 $ 0.84 $ 0.81 $ 0.83 $ 0.79 $ 0.71 $ 0.75 $ 0.70 $ 0.67 $ 0.64 $ 0.65 $ 0.62 $ 2.73 $ 2.96 $ 2.58
Diluted net income per common share (in dollars per share) $ 0.35 $ 0.83 $ 0.80 $ 0.82 $ 0.78 $ 0.71 $ 0.73 $ 0.68 $ 0.65 $ 0.62 $ 0.64 $ 0.62 $ 2.70 $ 2.91 $ 2.52