Annual report pursuant to Section 13 and 15(d)

INTANGIBLE ASSETS (Narrative) (Details)

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INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Goodwill, written off $ 0 $ 864,000      
Intangible assets, amortization expense     $ 18,521,000 $ 12,839,000 $ 6,088,000
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     4 years    
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     10 years    
Core Deposits | Minimum | Access National Bank          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     4 years    
Core Deposits | Maximum | Access National Bank          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     10 years    
Other Amortizable Intangibles | Minimum | Access National Bank          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     4 years    
Other Amortizable Intangibles | Maximum | Access National Bank          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period (years)     10 years    
Core Deposits and Other Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense     $ 18,500,000 $ 12,800,000 $ 6,100,000