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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
location
Jun. 30, 2017
USD ($)
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    
Commitments to extend credit [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount $ 2,407,277,000   2,300,593,000
Standby letters of credit and financial guarantees [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 15,654,000   14,579,000
Commitments to originate loans [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 72,384,000   56,030,000
Risk Participation Agreement [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 4,124,000   11,451,000
Commitments to originate loans held for sale [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 61,050,000   48,091,000
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 22,998,000   17,837,000
Counterparty default losses on forward contracts 0 $ 0  
Commitments to sell securities related to mortgage banking activities [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 80,441,000   $ 57,000,000
Counterparty default losses on forward contracts $ 0 $ 0