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REVENUE RECOGNITION - Summary of Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	$ 1,276		$ 765
Noninterest income (out-of-scope of Topic 606)	3,105		1,296
Total noninterest income	4,381	$ 6,975	2,061
Deposit service fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	810		539
Debit card fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	387		177
Other
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	$ 79		$ 49

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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