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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 97,984 $ 91,707 $ 84,274 $ 81,748 $ 83,749 $ 77,916 $ 72,416 $ 72,625 $ 355,713 $ 306,706 $ 272,459
Provision for credit losses 26,039 24,515 25,714 23,343 23,698 23,640 20,203 19,515 99,611 87,056 77,339
General and administrative expenses 40,891 40,167 37,743 38,183 36,616 35,861 33,215 34,592 156,984 140,284 130,955
Interest expense 10,285 10,348 9,771 9,721 9,643 8,729 7,915 7,177 40,125 33,464 23,908
Income tax 5,086 4,105 2,677 2,393 3,022 2,237 2,601 2,697 14,261 10,557 10,294
Net income $ 15,683 $ 12,572 $ 8,369 $ 8,108 $ 10,770 $ 7,449 $ 8,482 $ 8,644 $ 44,732 $ 35,345 $ 29,963
Net income per common share:                      
Basic $ 1.44 $ 1.11 $ 0.71 $ 0.69 $ 0.92 $ 0.64 $ 0.73 $ 0.74 $ 3.92 $ 3.03 $ 2.59
Diluted $ 1.38 $ 1.08 $ 0.70 $ 0.67 $ 0.90 $ 0.61 $ 0.70 $ 0.72 $ 3.80 $ 2.93 $ 2.54