COMMITMENTS AND CONTINGENCIES - Summary of Commitments to Extend Credit (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Standby letters of credit
Loss Contingencies [Line Items]
Commitments to extend credit	$ 13,883	$ 11,114
Loan commitments
Loss Contingencies [Line Items]
Commitments to extend credit	$ 193,804	$ 263,002

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