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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 2,575,469 $ 2,381,488    
Mortgage servicing rights 31,852 76,121 $ 49,939 $ 19,082
Derivative assets 1,005 17,968    
Derivative liabilities 1,033 2,116    
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    
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 2,575,469 2,381,488    
Derivative assets 1,005 17,968    
Derivative liabilities 1,033 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    
Mortgage servicing rights 2,059 76,121    
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 2,575,469 2,381,488    
Derivative assets 1,005 17,968    
Derivative liabilities 1,033 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, carried at fair value 0 0    
Mortgage servicing rights 0      
Mortgage servicing rights, including discontinued operations   0    
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, carried at fair value 6,359 358,714    
Mortgage servicing rights 0      
Mortgage servicing rights, including discontinued operations   0    
Derivative assets 1,005      
Derivative liabilities 1,033      
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 1,058 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 476,929 807,273    
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 756 117,177    
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 310,511      
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 1,702,318 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 83,897 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, carried at fair value 98,940 58,260    
Mortgage servicing rights 31,852      
Mortgage servicing rights, including discontinued operations   76,121    
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, carried at fair value 105,299 416,974    
Mortgage servicing rights 31,852      
Mortgage servicing rights, including discontinued operations   76,121    
Derivative assets 1,005      
Derivative liabilities 1,033      
Recurring | Carrying Value | SBA loan pool securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,058 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 476,929 807,273    
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 756 117,177    
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 310,511      
Recurring | Carrying Value | Collateralized loan obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,702,318 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 83,897 48,948    
Interest rate lock commitments | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
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    
Interest rate lock commitments | Recurring | Significant Other Observable Inputs (Level 2)        
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    
Interest rate lock commitments | Recurring | Significant Unobservable Inputs (Level 3)        
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    
Interest rate lock commitments | Recurring | Carrying Value        
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    
Mandatory forward commitments | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
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    
Mandatory forward commitments | Recurring | Significant Other Observable Inputs (Level 2)        
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    
Mandatory forward commitments | Recurring | Significant Unobservable Inputs (Level 3)        
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    
Mandatory forward commitments | Recurring | Carrying Value        
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    
Interest rate swaps on deposits and other borrowings | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   0    
Derivative liabilities   0    
Interest rate swaps on deposits and other borrowings | Recurring | Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   707    
Derivative liabilities   655    
Interest rate swaps on deposits and other borrowings | Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   0    
Derivative liabilities   0    
Interest rate swaps on deposits and other borrowings | Recurring | Carrying Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   707    
Derivative liabilities   655    
Foreign exchange contracts | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   0    
Derivative liabilities   0    
Foreign exchange contracts | Recurring | Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   47    
Derivative liabilities   18    
Foreign exchange contracts | Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   0    
Derivative liabilities   0    
Foreign exchange contracts | Recurring | Carrying Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets   47    
Derivative liabilities   18    
Banc Home Loan | Discontinued Operations, Disposed of by Sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held-for-sale, carried at fair value 38,696 406,338    
Servicing rights carried at fair value 0 37,681 $ 22,900 $ 10,700
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Recurring | Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held-for-sale, carried at fair value 6,400 348,100    
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held-for-sale, carried at fair value $ 32,300 $ 58,300