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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 2,915,103   $ 2,381,488      
Loans held-for-sale 449,391   711,188      
Mortgage servicing rights including discontinued operations 42,109 $ 42,833 76,121 $ 52,567 $ 48,370 $ 49,939
Derivative assets 2,117   17,968      
Derivative liabilities 1,856   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 160,171   406,338      
MSRs sold 0 $ 0 37,681 $ 24,400 $ 22,300 $ 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 2,915,103   2,381,488      
Loans held-for-sale 375,846   652,928      
Derivative assets 2,117   17,968      
Derivative liabilities 1,856   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 73,545   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 2,915,103   2,381,488      
Loans held-for-sale 439,646   704,651      
Derivative assets 2,117   17,968      
Derivative liabilities 1,856   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   0      
Derivative liabilities held in discontinued operations 0   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   0      
Derivative liabilities held in discontinued operations 0   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   0      
Derivative liabilities 0   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 108,094   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 108,100   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 841   8,317      
Derivative liabilities held in discontinued operations 0   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 201   8,897      
Derivative liabilities held in discontinued operations 762   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 1,075   707      
Derivative liabilities 1,094   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 0   47      
Derivative liabilities 0   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 1,149   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 496,805   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 951   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 310,118          
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 1,847,370   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 258,710   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 73,545   58,260      
Mortgage servicing rights 42,109          
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 52,100   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   0      
Derivative liabilities held in discontinued operations 0   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   0      
Derivative liabilities held in discontinued operations 0   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   0      
Derivative liabilities 0   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 181,639   416,974      
Mortgage servicing rights 42,109          
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 841   8,317      
Derivative liabilities held in discontinued operations 0   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 201   8,897      
Derivative liabilities held in discontinued operations 762   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 1,075   707      
Derivative liabilities 1,094   655      
Recurring | Carrying Value | Foreign exchange contracts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative assets 0   47      
Derivative liabilities 0   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 1,149   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 496,805   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 951   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 310,118          
Recurring | Carrying Value | Collateralized loan obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 1,847,370   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 $ 258,710   $ 48,948