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Segments Long-Lived Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 131,005,531 $ 129,268,976 $ 259,914,954 $ 256,349,072  
Disclosure on Geographic Areas, Long-Lived Assets     24357676   24184207
Provision for Loan and Lease Losses 38,975,972 35,870,744 $ 69,816,030 67,885,021  
General and Administrative Expense 70,908,751 63,455,788 143,825,840 126,404,293  
Interest Expense 4,790,744 5,518,878 9,037,446 11,105,197  
Income Tax Expense (Benefit) 6,530,719 8,932,101 14,368,607 18,845,142  
Net Income (Loss) Attributable to Parent 9,799,345 15,491,465 22,867,031 32,109,419 $ 73,600,294
UNITED STATES          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 118,929,051 118,611,404 $ 235,567,417 235,677,371  
Disclosure on Geographic Areas, Long-Lived Assets     21101522   20724777
Provision for Loan and Lease Losses 32,824,398 34,429,489 $ 60,534,025 63,347,983  
General and Administrative Expense 58,937,002 57,825,252 125,145,188 114,931,636  
Interest Expense 4,790,744 5,518,878 9,037,446 11,105,197  
Income Tax Expense (Benefit) 7,984,523 7,788,477 15,249,919 17,271,589  
Net Income (Loss) Attributable to Parent 14,392,384 13,049,308 25,600,839 29,020,966  
MEXICO          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 12,076,480 10,657,572 $ 24,347,537 20,671,701  
Disclosure on Geographic Areas, Long-Lived Assets     3256154   3459430
Provision for Loan and Lease Losses 6,151,574 1,441,255 $ 9,282,005 4,537,038  
General and Administrative Expense 11,971,749 5,630,536 18,680,652 11,472,657  
Interest Expense 0 0 0 0  
Income Tax Expense (Benefit) (1,453,804) 1,143,624 (881,312) 1,573,553  
Net Income (Loss) Attributable to Parent $ (4,593,039) $ 2,442,157 $ (2,733,808) $ 3,088,453