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DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Notional Amount Assets $ 69,090 $ 877,695
Total included in assets 1,112 17,968
Notional Amount Liability 69,090 338,820
Total included in liabilities 1,146 2,116
Interest rate lock commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 0 289,637
Derivative assets held in discontinued operations 0 8,317
Notional Amount Liability 0 22,945
Derivative liabilities held in discontinued operations 0 231
Mandatory forward commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 0 537,476
Derivative assets held in discontinued operations 0 8,897
Notional Amount Liability 0 265,322
Derivative liabilities held in discontinued operations 0 1,212
Interest rate swaps on deposits and other borrowings    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 69,090 46,346
Derivatives asset, fair values 1,112 707
Notional Amount Liability 69,090 46,346
Derivatives liability, fair values 1,146 655
Foreign exchange contracts    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 0 4,236
Derivatives asset, fair values 0 47
Notional Amount Liability 0 4,207
Derivatives liability, fair values $ 0 $ 18