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Derivative Financial Instruments, Agency Business (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Derivative Financial Instruments          
Notional Value, classified in Other Assets $ 100,898,203   $ 100,898,203   $ 550,117,700
Notional Value, classified in Other Liabilities 287,993,000   287,993,000   522,650,829
Net gains (losses) from changes in the fair value of derivatives 200,000 $ 200,000 (2,300,000) $ 200,000  
Income from mortgage servicing rights 18,897,239 $ 15,968,067 56,181,638 $ 15,968,067  
Agency Business          
Derivative Financial Instruments          
Notional Value, classified in Other Assets 388,891,203,000   388,891,203,000   975,718,529,000
Fair Value, classified in Other Assets 488,747,000   488,747,000   5,614,990,000
Fair Value, classified in Other Liabilities $ (1,881,450,000)   $ (1,881,450,000)   $ (2,299,579,000)
Non-Qualifying | Rate Lock Commitments | Agency Business          
Derivative Financial Instruments          
Count | item 7   7   12
Notional Value, classified in Other Assets $ 30,179,000,000   $ 30,179,000,000   $ 156,685,400,000
Fair Value, classified in Other Assets 419,758,000   419,758,000   2,816,132,000
Fair Value, classified in Other Liabilities $ (64,378,000)   $ (64,378,000)   $ (764,429,000)
Non-Qualifying | Forward Sale Commitments | Agency Business          
Derivative Financial Instruments          
Count | item 81   81   105
Notional Value, classified in Other Assets         $ 819,033,129,000
Notional Value, classified in Other Liabilities $ 358,712,203,000   $ 358,712,203,000    
Fair Value, classified in Other Assets 68,989,000   68,989,000   2,798,858,000
Fair Value, classified in Other Liabilities $ (1,817,072,000)   $ (1,817,072,000)   $ (1,535,150,000)