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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Individually Evaluated Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Loans receivable	$ 5,898,405	$ 5,951,885
Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	36,684
Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	10,457
Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	4,654
Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
SBA | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	3,596
Construction | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	17,820
Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	157
Commercial | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	8,485
Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Loans receivable	2,088,308	1,691,270
Commercial | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	5,492
Commercial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Loans receivable	807,195	818,817
Commercial | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	2,644
Commercial | Multifamily
Financing Receivable, Impaired [Line Items]
Loans receivable	1,289,820	1,494,528
Commercial | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Commercial | SBA
Financing Receivable, Impaired [Line Items]
Loans receivable	273,444	70,981
Commercial | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	349
Commercial | Construction
Financing Receivable, Impaired [Line Items]
Loans receivable	176,016	$ 231,350
Commercial | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Commercial | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Commercial | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Residential | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	20,484
Residential | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Residential | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	2,010
Residential | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Residential | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	497
Residential | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Residential | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	17,820
Residential | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	157
Business Assets | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	7,715
Business Assets | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	4,965
Business Assets | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Business Assets | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Business Assets | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	2,750
Business Assets | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Business Assets | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	0
Business Assets | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Loans receivable	$ 0

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