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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Purchases, Sales, and Transfers (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchases of loans (excluding loans held-for-sale) $ 25,800,000   $ 0 $ 25,800,000 $ 0
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (883,975,000)   (1,127,339,000)
Gain (loss) on sale of loans 0 $ (27,000) 2,767,000 (27,000) 4,319,000
Commercial | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (573,000)   (573,000)
Commercial | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (752,087,000)   (752,087,000)
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale 0     0  
Transfers (to) Held-For-Sale 0     0  
Consumer | Single family residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers from Held-For-Sale     0   0
Transfers (to) Held-For-Sale     (131,315,000)   (374,679,000)
Loans sold $ 0   131,500,000 $ 0 374,700,000
Gain (loss) on sale of loans     $ 125,000   $ 1,800,000