CREDIT QUALITY ASSESSMENT (Collateral dependent loans individually evaluated for credit loss) (Detail) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	$ 28,461,000	$ 15,333,000
Allowance	8,827,000	5,501,000
Loans individually evaluated for credit loss without an allowance	32,067,000	9,440,000
Total individually evaluated collateral dependent loans	60,528,000	$ 24,773,000
Total unpaid contractual principal balance	74,872,000
Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	25,944,000
Loans individually evaluated for credit loss without an allowance	27,076,000
Total individually evaluated collateral dependent loans	53,020,000
Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	1,947,000
Loans individually evaluated for credit loss without an allowance	3,008,000
Total individually evaluated collateral dependent loans	4,955,000
Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	570,000
Loans individually evaluated for credit loss without an allowance	1,983,000
Total individually evaluated collateral dependent loans	2,553,000
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	9,517,000
Allowance	5,488,000
Loans individually evaluated for credit loss without an allowance	11,436,000
Total individually evaluated collateral dependent loans	20,953,000
Total unpaid contractual principal balance	24,131,000
Commercial [Member] | Non-accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	7,851,000
Loans individually evaluated for credit loss without an allowance	10,266,000
Total individually evaluated collateral dependent loans	18,117,000
Commercial [Member] | Non-accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	1,096,000
Loans individually evaluated for credit loss without an allowance	1,033,000
Total individually evaluated collateral dependent loans	2,129,000
Commercial [Member] | Accruing [Member] | Restructured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for credit loss with an allowance	570,000
Loans individually evaluated for credit loss without an allowance	137,000
Total individually evaluated collateral dependent loans	707,000
Consumer [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	1,183,000
Total individually evaluated collateral dependent loans	1,282,000
Total unpaid contractual principal balance	1,554,000
Consumer [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	819,000
Total individually evaluated collateral dependent loans	918,000
Consumer [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 [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	2,957,000
Allowance	635,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	2,957,000
Total unpaid contractual principal balance	2,957,000
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	2,957,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	2,957,000
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	15,026,000
Allowance	2,573,000
Loans individually evaluated for credit loss without an allowance	12,231,000
Total individually evaluated collateral dependent loans	27,257,000
Total unpaid contractual principal balance	33,150,000
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	14,291,000
Loans individually evaluated for credit loss without an allowance	11,456,000
Total individually evaluated collateral dependent loans	25,747,000
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	735,000
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	735,000
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	862,000
Allowance	32,000
Loans individually evaluated for credit loss without an allowance	5,867,000
Total individually evaluated collateral dependent loans	6,729,000
Total unpaid contractual principal balance	10,337,000
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	746,000
Loans individually evaluated for credit loss without an allowance	4,529,000
Total individually evaluated collateral dependent loans	5,275,000
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	116,000
Loans individually evaluated for credit loss without an allowance	1,338,000
Total individually evaluated collateral dependent loans	1,454,000
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 loans [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	1,350,000
Total individually evaluated collateral dependent loans	1,350,000
Total unpaid contractual principal balance	2,743,000
Residential Real Estate [Member] | Residential mortgage loans [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	6,000
Total individually evaluated collateral dependent loans	6,000
Residential Real Estate [Member] | Residential mortgage loans [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 loans [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	1,071,000
Total individually evaluated collateral dependent loans	1,071,000
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