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15. Financial Instruments with Off-Balance-Sheet Risk (Tables)
12 Months Ended
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]  
Off balance sheet financial instruments risk
    Contract or  
    Notional Amount  
    2015     2014  
             
Unused portions of home equity lines of credit   $ 25,074,972     $ 23,519,696  
Other commitments to extend credit     66,189,395       59,558,700  
Residential construction lines of credit     3,658,037       2,308,167  
Commercial real estate and other construction lines of credit     15,586,595       15,894,462  
Standby letters of credit and commercial letters of credit     1,859,059       1,714,382  
Recourse on sale of credit card portfolio     262,625       265,650  
MPF credit enhancement obligation, net (see Note 16)     1,051,601       1,007,250