SBA AND USDA LOAN SERVICING - Other information (Details)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
SBA And USDA Loan
SBA AND USDA LOAN SERVICING
Unpaid principal balances of serviced loans	$ 441,600,000	$ 431,200,000
Aggregate fair market value of the interest only strips included in SBA servicing assets	$ 26,000	$ 27,000
Discount Rate
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	14
Prepayment speed
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	16	15
Minimum | Discount Rate
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights		11
Minimum | Discount Rate | SBA And USDA Loan
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	5.80	8.78
Minimum | Prepayment speed | SBA And USDA Loan
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	10.82	6.82
Maximum | Discount Rate
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights		14
Maximum | Discount Rate | SBA And USDA Loan
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	12.06	14.56
Maximum | Prepayment speed | SBA And USDA Loan
SBA AND USDA LOAN SERVICING
Measurement input of servicing rights	16.54	12.87