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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 2,434,541,000 $ 2,381,488,000    
Loans held-for-sale 653,422,000 711,188,000    
Mortgage servicing rights including discontinued operations 42,833,000 76,121,000 $ 48,370,000 $ 49,939,000
Derivative assets 11,065,000 17,968,000    
Derivative liabilities 4,086,000 2,116,000    
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 420,449,000 406,338,000    
MSRs sold 0 37,681,000 $ 22,300,000 $ 23,000,000
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 2,434,541,000 2,381,488,000    
Loans held-for-sale 586,721,000 652,928,000    
Derivative assets 11,065,000 17,968,000    
Derivative liabilities 4,086,000 2,116,000    
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 66,701,000 58,260,000    
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 2,434,541,000 2,381,488,000    
Loans held-for-sale 649,327,000 704,651,000    
Derivative assets 11,065,000 17,968,000    
Derivative liabilities 4,086,000 2,116,000    
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) | Private label 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) | Corporate bonds        
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) | 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) | Agency mortgage-backed 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 355,443,000 358,714,000    
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 353,748,000 348,078,000    
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 9,813,000 8,317,000    
Derivative liabilities held in discontinued operations 81,000 231,000    
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 153,000 8,897,000    
Derivative liabilities held in discontinued operations 2,909,000 1,212,000    
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 1,099,000 707,000    
Derivative liabilities 1,096,000 655,000    
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 47,000    
Derivative liabilities 0 18,000    
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 1,145,000 1,221,000    
Recurring | Significant Other Observable Inputs (Level 2) | Private label residential mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 116,757,000 117,177,000    
Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 19,144,000 48,948,000    
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 1,502,253,000 1,406,869,000    
Recurring | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 795,242,000 807,273,000    
Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held-for-sale 66,701,000 58,260,000    
Mortgage servicing rights 42,833,000      
Mortgage servicing rights including discontinued operations   76,121,000    
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 66,701,000 58,260,000    
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) | Private label 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) | Corporate bonds        
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) | 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) | Agency mortgage-backed 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 422,144,000 416,974,000    
Mortgage servicing rights 42,833,000      
Mortgage servicing rights including discontinued operations   76,121,000    
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 9,813,000 8,317,000    
Derivative liabilities held in discontinued operations 81,000 231,000    
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 153,000 8,897,000    
Derivative liabilities held in discontinued operations 2,909,000 1,212,000    
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 1,099,000 707,000    
Derivative liabilities 1,096,000 655,000    
Recurring | Carrying Value | Foreign exchange contracts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 0 47,000    
Derivative liabilities 0 18,000    
Recurring | Carrying Value | SBA loan pool securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,145,000 1,221,000    
Recurring | Carrying Value | Private label residential mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 116,757,000 117,177,000    
Recurring | Carrying Value | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 19,144,000 48,948,000    
Recurring | Carrying Value | Collateralized loan obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,502,253,000 1,406,869,000    
Recurring | Carrying Value | Agency mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 795,242,000 $ 807,273,000