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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for Unfunded Loan Commitments $ 12,100,000   $ 13,300,000
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 $ 3,357,135,000   3,207,072,000
Financial Standby Letter of Credit [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 21,493,000   18,415,000
Loan Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 134,759,000   101,426,000
Risk Participation Agreement [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 40,789,000   40,949,000
Loans Held for Sale Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 165,236,000   169,653,000
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 82,963,000   79,414,000
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 199,500,000   204,000,000
Amount funded out of a total commitment to invest [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Other Commitment 4,200,000   2,800,000
Amount unfunded out of a total commitment to invest [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Other Commitment $ 5,800,000   $ 7,200,000