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INVESTMENT SECURITIES - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses for debt securities	$ 0
Other than temporary impairment loss	0
Other than temporary impairment losses	$ 0	$ 731,000	$ 3,252,000
Securities available-for-sale portfolio | security	103	70
Securities in unrealized loss position | security	50	60
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 4,500,000	$ 5,600,000
Collateral
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, pledged	$ 43,700,000	$ 44,000,000.0

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- Definition

Number of available for sale securities in portfolio.

+ References

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-SubTopic 30
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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