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Segments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]                      
Schedule of Segment Reporting Information, by Segment [Table Text Block]                

   
Assets $ 854,988,073       $ 840,987,037       $ 854,988,073 $ 840,987,037  
Revenues 156,997,000 $ 137,639,000 $ 127,116,000 $ 122,790,000 141,399,000 $ 125,704,000 $ 118,929,000 $ 116,638,000 544,542,925 502,668,332 $ 490,821,420
Provision for Loan and Lease Losses 28,533,000 48,944,000 40,359,000 30,591,000 16,631,000 40,456,000 32,824,000 27,710,000 148,426,578 117,620,140 119,095,712
General and Administrative Expense 78,626,000 76,964,000 64,936,000 67,777,000 75,282,000 64,850,000 62,767,000 66,208,000 288,303,715 269,107,669 244,273,626
Interest Expense 4,914,000 4,637,000 4,158,000 4,225,000 5,052,000 5,001,000 4,791,000 4,247,000 17,934,060 19,089,635 21,504,208
Income Tax Expense (Benefit) 6,984,000 834,000 3,604,000 4,559,000 18,778,000 15,204,000 6,511,000 7,265,000 15,981,057 47,757,808 38,157,492
Net Income (Loss) Attributable to Parent $ 37,940,000 $ 6,260,000 $ 14,538,000 $ (21,503,000) $ 29,143,000 $ 1,680,000 $ 9,800,000 $ 13,067,000 $ 37,235,134 $ 53,690,018 73,600,294
MEXICO                      
Segment Reporting Information [Line Items]                      
Revenues                     40,913,304
Provision for Loan and Lease Losses                     9,476,450
Income Tax Expense (Benefit)                     $ 2,239,345