CREDIT QUALITY ASSESSMENT (Collateral dependent loans individually evaluated for credit loss) (Detail) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	$ 26,652,000	$ 15,333,000
Allowance	8,643,000	5,501,000
Loans individually evaluated for credit loss without an allowance	11,023,000	9,440,000
Total individually evaluated collateral dependent loans	37,675,000	$ 24,773,000
Total unpaid contractual principal balance	50,019,000
Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	24,098,000
Loans individually evaluated for credit loss without an allowance	5,283,000
Total individually evaluated collateral dependent loans	29,381,000
Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	1,975,000
Loans individually evaluated for credit loss without an allowance	3,744,000
Total individually evaluated collateral dependent loans	5,719,000
Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	579,000
Loans individually evaluated for credit loss without an allowance	1,996,000
Total individually evaluated collateral dependent loans	2,575,000
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	9,653,000
Allowance	5,659,000
Loans individually evaluated for credit loss without an allowance	1,907,000
Total individually evaluated collateral dependent loans	11,560,000
Total unpaid contractual principal balance	14,450,000
Commercial [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	7,967,000
Loans individually evaluated for credit loss without an allowance	362,000
Total individually evaluated collateral dependent loans	8,329,000
Commercial [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	1,107,000
Loans individually evaluated for credit loss without an allowance	1,398,000
Total individually evaluated collateral dependent loans	2,505,000
Commercial [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	579,000
Loans individually evaluated for credit loss without an allowance	147,000
Total individually evaluated collateral dependent loans	726,000
Consumer Loan [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	99,000
Allowance	99,000
Loans individually evaluated for credit loss without an allowance	1,214,000
Total individually evaluated collateral dependent loans	1,313,000
Total unpaid contractual principal balance	1,583,000
Consumer Loan [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	99,000
Loans individually evaluated for credit loss without an allowance	850,000
Total individually evaluated collateral dependent loans	949,000
Consumer Loan [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	364,000
Total individually evaluated collateral dependent loans	364,000
Consumer Loan [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	829,000
Allowance	132,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	829,000
Total unpaid contractual principal balance	829,000
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	829,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	829,000
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	15,192,000
Allowance	2,704,000
Loans individually evaluated for credit loss without an allowance	3,353,000
Total individually evaluated collateral dependent loans	18,545,000
Total unpaid contractual principal balance	24,373,000
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	14,443,000
Loans individually evaluated for credit loss without an allowance	2,578,000
Total individually evaluated collateral dependent loans	17,021,000
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	749,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	749,000
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	775,000
Total individually evaluated collateral dependent loans	775,000
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	879,000
Allowance	49,000
Loans individually evaluated for credit loss without an allowance	3,195,000
Total individually evaluated collateral dependent loans	4,074,000
Total unpaid contractual principal balance	6,037,000
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	760,000
Loans individually evaluated for credit loss without an allowance	1,486,000
Total individually evaluated collateral dependent loans	2,246,000
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	119,000
Loans individually evaluated for credit loss without an allowance	1,709,000
Total individually evaluated collateral dependent loans	1,828,000
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Allowance	0
Loans individually evaluated for credit loss without an allowance	1,354,000
Total individually evaluated collateral dependent loans	1,354,000
Total unpaid contractual principal balance	2,747,000
Residential Real Estate [Member] | Residential Mortgage [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	7,000
Total individually evaluated collateral dependent loans	7,000
Residential Real Estate [Member] | Residential Mortgage [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	273,000
Total individually evaluated collateral dependent loans	273,000
Residential Real Estate [Member] | Residential Mortgage [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	1,074,000
Total individually evaluated collateral dependent loans	1,074,000
Residential Real Estate [Member] | Residential Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Total unpaid contractual principal balance	0
Residential Real Estate [Member] | Residential Construction [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential Real Estate [Member] | Residential Construction [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential Real Estate [Member] | Residential Construction [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	$ 0