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Commitments and Contingencies - Company's Significant Commitments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to extend credit    
Home equity lines of credit $ 5,569,936 $ 5,631,680
Commercial real estate loans to be sold 112,251 57,597
Other commercial real estate 6,325,178 5,949,933
Residential real estate loans to be sold 638,037 488,621
Other residential real estate 286,848 212,619
Commercial and other 11,898,046 11,802,850
Standby letters of credit 3,343,858 3,330,013
Commercial letters of credit 46,748 55,559
Financial guarantees and indemnification contracts 2,926,230 2,794,322
Commitments to sell real estate loans $ 1,155,969 $ 782,885