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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) $ in Thousands	Jun. 30, 2021 USD ($) Loan	Dec. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items]
Loans 90 days past due and still accruing	$ 0	$ 728
Loans on non-accrual status	51,299	35,900
Other real estate owned, net	3,253	0
Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Other real estate owned, net	3,300
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 21,207	13,519
Number of loans in process of foreclosure | Loan	0
NTM Loans
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 9,238	8,697
NTM Loans | Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	9,238	8,697
NTM Loans | Green Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	5,900	4,000
Green Loans (HELOC) - first liens | NTM Loans | Interest Only Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 3,400	$ 4,700

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