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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
location
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for Unfunded Loan Commitments $ 2,400,000   $ 3,600,000
Number of Properties Subject to Non-cancelable Operating Leases | location 115    
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 $ 2,339,558,000   2,204,795,000
Standby letters of credit and financial guarantees [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 15,432,000   17,694,000
Commitments to originate loans [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 64,263,000   69,833,000
Risk Participation Agreement [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 11,516,000   7,488,000
Commitments to originate loans held for sale [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 68,976,000   69,487,000
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 39,848,000   36,907,000
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 100,500,000   $ 44,000,000
Counterparty default losses on forward contracts $ 0 $ 0