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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans 90 days past due and still accruing	$ 0	$ 0
Loans on non-accrual status	72,703,000	43,354,000
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	28,470,000	18,625,000
Loans in process of foreclosure	6,300,000	15,700,000
NTM Loans
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	19,199,000	13,019,000
NTM Loans | Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	19,199,000	13,019,000
NTM Loans | Green Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	4,600,000	1,500,000
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	$ 14,600,000	$ 11,500,000

X

- Definition

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

+ References

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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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