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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Reserve for Unfunded Loan Commitments $ 12,100,000   $ 12,100,000   $ 2,700,000
Mortgage loan applications, day interest rate is locked     45 days    
Minimum [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Mortgage loan applications, day interest rate is locked     30 days    
Maximum [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Mortgage loan applications, day interest rate is locked     60 days    
Commitments to Extend Credit [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 3,144,860,000   $ 3,144,860,000   3,051,681,000
Financial Standby Letter of Credit [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 15,677,000   15,677,000   14,298,000
Loan Origination Commitments [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 114,040,000   114,040,000   39,676,000
Risk Participation Agreement [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 40,968,000   40,968,000   41,022,000
Loans Held for Sale Origination Commitments [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 282,025,000   282,025,000   66,196,000
Commitments to Sell Loans Secured by one to four Residential Properties [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount 109,994,000   109,994,000   70,895,000
Counterparty default losses on forward contracts 0 $ 0 0 $ 0  
Commitments to Sell Mortgage Backed Securities [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Contract or Notional Amount $ 259,000,000   $ 259,000,000   239,320,000
Amount funded out of a total commitment to invest [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Other Commitment         1,800,000
Amount unfunded out of a total commitment to invest [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Other Commitment         $ 8,200,000