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Quarterly Information (Unaudited) - Summary of the Company's Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 64,021 $ 62,475 $ 57,325 $ 56,697 $ 56,685 $ 55,096 $ 53,001 $ 52,524 $ 240,518 $ 217,306 $ 204,719
Provision for credit losses 19,427 16,410 13,386 13,791 11,449 14,085 12,102 9,712 63,014 47,348 69,057
General and administrative expenses 28,826 30,453 29,548 29,805 28,550 26,182 28,243 32,623 118,632 115,598 96,776
Interest expense 5,287 5,116 4,811 4,710 4,350 4,335 3,932 3,604 19,924 16,221 14,947
Income tax 4,014 4,020 3,668 3,215 4,969 3,987 3,316 2,502 14,917 14,774 9,137
Net income $ 6,467 $ 6,476 $ 5,912 $ 5,176 $ 7,367 $ 6,507 $ 5,408 $ 4,083 $ 24,031 $ 23,365 $ 14,802
Net income per common share:                      
Basic $ 0.57 $ 0.57 $ 0.50 $ 0.41 $ 0.57 $ 0.51 $ 0.42 $ 0.32 $ 2.03 $ 1.82 $ 1.17
Diluted $ 0.55 $ 0.56 $ 0.49 $ 0.40 $ 0.56 $ 0.50 $ 0.41 $ 0.31 $ 1.99 $ 1.79 $ 1.14