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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) $ in Thousands	Mar. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan
Financing Receivable, Past Due [Line Items]
Loans 90 days past due and still accruing	$ 0	$ 728
Loans on non-accrual status	55,920	35,900
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 32,432	$ 13,519
Number of loans in process of foreclosure | Loan	1,000	0
Loans in process of foreclosure	$ 3,300
NTM Loans
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	11,652	$ 8,697
NTM Loans | Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	11,652	8,697
NTM Loans | Green Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	4,500	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	$ 7,100	$ 4,700

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Amount of financing receivable 90 days or more past due and still accruing.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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