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Loans and Leases - Total Loans and Leases Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Loans    
Commercial, financial, etc. $ 21,351,119 $ 19,223,419
Real estate:    
Residential 22,584,141 26,249,059
Commercial 25,550,057 23,592,097
Construction 8,066,756 5,716,994
Consumer 12,130,094 11,584,347
Total loans 89,682,167 86,365,916
Leases    
Commercial 1,419,510 1,353,318
Total loans and leases 91,101,677 87,719,234
Unearned discount (248,261) (229,735)
Loans and leases, net of unearned discount $ 90,853,416 $ 87,489,499