CREDIT QUALITY ASSESSMENT (Recorded Investment with Respect to Impaired loans, Associated Allowance by Applicable Portfolio Segment) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		$ 15,333
Allowance		5,501
Impaired loans without a specific allowance		9,440
Impaired loans	$ 37,700	24,773
Unpaid principal balance in total impaired loans		34,620
Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		12,652
Impaired loans without a specific allowance		4,188
Impaired loans		16,840
Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		266
Impaired loans without a specific allowance		2,370
Impaired loans		2,636
Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		2,415
Impaired loans without a specific allowance		2,882
Impaired loans		5,297
Commercial [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		7,730
Allowance		3,817
Impaired loans without a specific allowance		1,137
Impaired loans		8,867
Unpaid principal balance in total impaired loans		11,296
Commercial [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		5,608
Impaired loans without a specific allowance		114
Impaired loans		5,722
Commercial [Member] | Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		266
Impaired loans without a specific allowance		151
Impaired loans		417
Commercial [Member] | Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		1,856
Impaired loans without a specific allowance		872
Impaired loans		2,728
All Other
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Allowance		0
Impaired loans without a specific allowance		1,717
Impaired loans		1,717
Unpaid principal balance in total impaired loans		2,618
All Other | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		0
Impaired loans		0
All Other | Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		1,444
Impaired loans		1,444
All Other | Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		273
Impaired loans		273
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		829
Allowance		132
Impaired loans without a specific allowance		0
Impaired loans		829
Unpaid principal balance in total impaired loans		829
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		829
Impaired loans without a specific allowance		0
Impaired loans		829
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		0
Impaired loans		0
Commercial Real Estate Portfolio Segment | Commercial AD&C [Member] | Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		0
Impaired loans		0
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		5,885
Allowance		1,529
Impaired loans without a specific allowance		3,327
Impaired loans		9,212
Unpaid principal balance in total impaired loans		13,805
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		5,448
Impaired loans without a specific allowance		2,552
Impaired loans		8,000
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		775
Impaired loans		775
Commercial Real Estate Portfolio Segment | Commercial Investor RE [Member] | Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		437
Impaired loans without a specific allowance		0
Impaired loans		437
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		889
Allowance		23
Impaired loans without a specific allowance		3,259
Impaired loans		4,148
Unpaid principal balance in total impaired loans		6,072
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		767
Impaired loans without a specific allowance		1,522
Impaired loans		2,289
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Restructured [Member] | Accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		0
Impaired loans without a specific allowance		0
Impaired loans		0
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied RE [Member] | Restructured [Member] | Non-accruing [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance		122
Impaired loans without a specific allowance		1,737
Impaired loans		$ 1,859