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CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Total past due   $ 27,748
Non-accrual loans   38,632
Loans acquired with deteriorated credit quality   13,084
Current loans   6,625,768
Total loans $ 10,333,935 6,705,232
Commercial real estate: | Commercial investor real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   932
Non-accrual loans   8,437
Loans acquired with deteriorated credit quality   9,544
Current loans   2,150,243
Total loans 3,588,702 2,169,156
Commercial real estate: | Commercial owner-occupied real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   316
Non-accrual loans   4,148
Loans acquired with deteriorated credit quality   0
Current loans   1,284,213
Total loans 1,652,208 1,288,677
Commercial real estate: | Commercial AD&C    
Financing Receivable, Past Due [Line Items]    
Total past due   0
Non-accrual loans   829
Loans acquired with deteriorated credit quality   0
Current loans   683,181
Total loans 994,800 684,010
Commercial Business    
Financing Receivable, Past Due [Line Items]    
Non-accrual loans   8,450
Total loans 8,462,956 4,942,862
Commercial Business | Commercial business    
Financing Receivable, Past Due [Line Items]    
Total past due   1,278
Non-accrual loans   8,450
Loans acquired with deteriorated credit quality   2,539
Current loans   788,752
Total loans 2,227,246 801,019
Residential real estate: | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Total past due   19,394
Non-accrual loans   12,661
Loans acquired with deteriorated credit quality   8
Current loans   1,117,264
Total loans 1,173,857 1,149,327
Residential real estate: | Residential construction    
Financing Receivable, Past Due [Line Items]    
Total past due   1,614
Non-accrual loans   0
Loans acquired with deteriorated credit quality   0
Current loans   144,665
Total loans 175,123 146,279
Consumer    
Financing Receivable, Past Due [Line Items]    
Total past due   4,214
Non-accrual loans   4,107
Loans acquired with deteriorated credit quality   993
Current loans   457,450
Total loans $ 521,999 466,764
30-59 days    
Financing Receivable, Past Due [Line Items]    
Total past due   19,986
30-59 days | Commercial real estate: | Commercial investor real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   932
30-59 days | Commercial real estate: | Commercial owner-occupied real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   316
30-59 days | Commercial real estate: | Commercial AD&C    
Financing Receivable, Past Due [Line Items]    
Total past due   0
30-59 days | Commercial Business | Commercial business    
Financing Receivable, Past Due [Line Items]    
Total past due   908
30-59 days | Residential real estate: | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Total past due   14,853
30-59 days | Residential real estate: | Residential construction    
Financing Receivable, Past Due [Line Items]    
Total past due   280
30-59 days | Consumer    
Financing Receivable, Past Due [Line Items]    
Total past due   2,697
60-89 days    
Financing Receivable, Past Due [Line Items]    
Total past due   7,762
60-89 days | Commercial real estate: | Commercial investor real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   0
60-89 days | Commercial real estate: | Commercial owner-occupied real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   0
60-89 days | Commercial real estate: | Commercial AD&C    
Financing Receivable, Past Due [Line Items]    
Total past due   0
60-89 days | Commercial Business | Commercial business    
Financing Receivable, Past Due [Line Items]    
Total past due   370
60-89 days | Residential real estate: | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Total past due   4,541
60-89 days | Residential real estate: | Residential construction    
Financing Receivable, Past Due [Line Items]    
Total past due   1,334
60-89 days | Consumer    
Financing Receivable, Past Due [Line Items]    
Total past due   1,517
> 90 days    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Commercial real estate: | Commercial investor real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Commercial real estate: | Commercial owner-occupied real estate    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Commercial real estate: | Commercial AD&C    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Commercial Business | Commercial business    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Residential real estate: | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Residential real estate: | Residential construction    
Financing Receivable, Past Due [Line Items]    
Total past due   0
> 90 days | Consumer    
Financing Receivable, Past Due [Line Items]    
Total past due   $ 0