CREDIT QUALITY ASSESSMENT (historical information on the credit quality of the loan portfolio under the legacy disclosure) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		$ 38,632
Loans 90 days past due		0
Restructured loans		2,636
Total non-performing loans		41,268
Other real estate owned	$ 1,389	1,482
Total non-performing assets		42,750
Commercial real estate: | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		8,437
Loans 90 days past due		0
Restructured loans		775
Total non-performing loans		9,212
Other real estate owned		409
Total non-performing assets		9,621
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		4,148
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		4,148
Other real estate owned		0
Total non-performing assets		4,148
Commercial real estate: | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		829
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		829
Other real estate owned		665
Total non-performing assets		1,494
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		8,450
Loans 90 days past due		0
Restructured loans		417
Total non-performing loans		8,867
Other real estate owned		39
Total non-performing assets		8,906
Residential real estate: | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		12,661
Loans 90 days past due		0
Restructured loans		1,080
Total non-performing loans		13,741
Other real estate owned		305
Total non-performing assets		14,046
Residential real estate: | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		0
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		0
Other real estate owned		0
Total non-performing assets		0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		4,107
Loans 90 days past due		0
Restructured loans		364
Total non-performing loans		4,471
Other real estate owned		64
Total non-performing assets		$ 4,535