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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
location
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for Unfunded Loan Commitments     $ 2,400,000
Number of Properties Subject to Non-cancelable Operating Leases | location 117    
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    
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount $ 2,650,671,000   2,300,593,000
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 15,129,000   14,579,000
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 61,465,000   56,030,000
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 4,108,000   11,451,000
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 58,308,000   48,091,000
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 25,802,000   17,837,000
Counterparty default losses on forward contracts 0 $ 0  
ERROR in label resolution.      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 103,100,000   $ 57,000,000
Counterparty default losses on forward contracts $ 0 $ 0