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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 2,755,664   $ 2,381,488      
Loans held-for-sale 109,756   711,188      
Mortgage servicing rights including discontinued operations 38,715 $ 42,109 76,121 $ 62,676 $ 52,567 $ 49,939
Derivative assets 1,112   17,968      
Derivative liabilities 1,146   2,116      
Discontinued Operations, Disposed of by Sale | Banc Home Loan            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale, carried at fair value 58,954   406,338      
MSRs sold 0 $ 0 37,681 $ 30,800 $ 24,400 $ 23,000
Quoted Prices in Active Markets for Identical Assets (Level 1)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Loans held-for-sale 0   0      
Derivative assets 0   0      
Derivative liabilities 0   0      
Significant Other Observable Inputs (Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 2,755,664   2,381,488      
Loans held-for-sale 25,392   652,928      
Derivative assets 1,112   17,968      
Derivative liabilities 1,146   2,116      
Significant Unobservable Inputs (Level 3)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Loans held-for-sale 84,364   58,260      
Derivative assets 0   0      
Derivative liabilities 0   0      
Carrying Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 2,755,664   2,381,488      
Loans held-for-sale 109,084   704,651      
Derivative assets 1,112   17,968      
Derivative liabilities 1,146   2,116      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale 0   0      
Mortgage servicing rights 0          
Mortgage servicing rights including discontinued operations     0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     0      
Derivative liabilities held in discontinued operations     0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mandatory forward commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     0      
Derivative liabilities held in discontinued operations     0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps on deposits and other borrowings            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets 0   0      
Derivative liabilities 0   0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets     0      
Derivative liabilities     0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | SBA loan pool securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0          
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Significant Other Observable Inputs (Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale 17,778   358,714      
Mortgage servicing rights 0          
Mortgage servicing rights including discontinued operations     0      
Recurring | Significant Other Observable Inputs (Level 2) | Discontinued Operations, Disposed of by Sale | Banc Home Loan            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale, carried at fair value 17,800   348,100      
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     8,317      
Derivative liabilities held in discontinued operations     231      
Recurring | Significant Other Observable Inputs (Level 2) | Mandatory forward commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     8,897      
Derivative liabilities held in discontinued operations     1,212      
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on deposits and other borrowings            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets 1,112   707      
Derivative liabilities 1,146   655      
Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets     47      
Derivative liabilities     18      
Recurring | Significant Other Observable Inputs (Level 2) | SBA loan pool securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 1,065   1,221      
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 489,117   807,273      
Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 859   117,177      
Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 310,917          
Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 1,819,191   1,406,869      
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 134,515   48,948      
Recurring | Significant Unobservable Inputs (Level 3)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale 84,364   58,260      
Mortgage servicing rights 38,715          
Mortgage servicing rights including discontinued operations     76,121      
Recurring | Significant Unobservable Inputs (Level 3) | Discontinued Operations, Disposed of by Sale | Banc Home Loan            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale, carried at fair value 41,200   58,300      
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     0      
Derivative liabilities held in discontinued operations     0      
Recurring | Significant Unobservable Inputs (Level 3) | Mandatory forward commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     0      
Derivative liabilities held in discontinued operations     0      
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps on deposits and other borrowings            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets 0   0      
Derivative liabilities 0   0      
Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets     0      
Derivative liabilities     0      
Recurring | Significant Unobservable Inputs (Level 3) | SBA loan pool securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0          
Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0      
Recurring | Carrying Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held-for-sale 102,142   416,974      
Mortgage servicing rights 38,715          
Mortgage servicing rights including discontinued operations     76,121      
Recurring | Carrying Value | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     8,317      
Derivative liabilities held in discontinued operations     231      
Recurring | Carrying Value | Mandatory forward commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets held in discontinued operations     8,897      
Derivative liabilities held in discontinued operations     1,212      
Recurring | Carrying Value | Interest rate swaps on deposits and other borrowings            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets 1,112   707      
Derivative liabilities 1,146   655      
Recurring | Carrying Value | Foreign exchange contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets     47      
Derivative liabilities     18      
Recurring | Carrying Value | SBA loan pool securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 1,065   1,221      
Recurring | Carrying Value | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 489,117   807,273      
Recurring | Carrying Value | Non-agency residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 859   117,177      
Recurring | Carrying Value | Non-agency commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 310,917          
Recurring | Carrying Value | Collateralized loan obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 1,819,191   1,406,869      
Recurring | Carrying Value | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 134,515   $ 48,948