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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for Unfunded Loan Commitments $ 11,500,000   $ 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 $ 2,975,390,000   3,051,681,000
Financial Standby Letter of Credit [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 15,619,000   14,298,000
Loan Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 75,180,000   39,676,000
Risk Participation Agreement [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 41,004,000   41,022,000
Loans Held for Sale Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 191,119,000   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 81,429,000   70,895,000
Counterparty default losses on forward contracts 0 $ 0  
Commitments to Sell Mortgage Backed Securities [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 229,000,000   239,320,000
Counterparty default losses on forward contracts $ 0 $ 0  
Amount funded out of a total commitment to invest [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Other Commitment     467,000
Amount unfunded out of a total commitment to invest [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Other Commitment     $ 9,500,000