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COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details)
9 Months Ended
Sep. 30, 2016
USD ($)
location
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for Unfunded Loan Commitments $ 3,600,000   $ 3,900,000
Number of Properties Subject to Non-cancelable Operating Leases | location 109    
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 $ 2,209,750,000   2,132,996,000
Standby letters of credit and financial guarantees [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 21,655,000   22,315,000
Commitments to originate loans [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 61,444,000   32,908,000
Risk Participation Agreement [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 7,535,000   7,672,000
Commitments to originate loans held for sale [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract or Notional Amount 106,019,000   76,146,000
Commitmenst 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 42,456,000   37,545,000
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 59,854,000   $ 41,500,000
Counterparty default losses on forward contracts $ 0 $ 0