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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Purchases, Sales, and Transfers (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchases of loans (excluding loans held-for-sale) $ 129,000,000.0   $ 0 $ 154,900,000 $ 0
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (559,000)   (1,127,898,000)
Gain (loss) on sale of loans 272,000 $ 0 4,310,000 245,000 8,629,000
Commercial | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     0   (573,000)
Commercial | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     0   (752,087,000)
Loans sold     573,500,000   751,600,000
Gain (loss) on sale of loans     8,900,000   11,700,000
Commercial | SBA          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (559,000)   (559,000)
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale 0     0  
Transfers (to) Held-For-Sale 0     0  
Consumer | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers (to) Held-For-Sale         (573,900,000)
Consumer | Single family residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     0   (374,679,000)
Loans sold 17,600,000   144,000 17,600,000 374,800,000
Gain (loss) on sale of loans $ 297,000   $ 8,000 $ 297,000 $ 1,800,000