COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Reserve for Unfunded Loan Commitments			$ 2,600,000
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
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	$ 2,843,134,000		2,837,981,000
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	15,861,000		17,784,000
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	50,692,000		32,145,000
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	24,074,000		24,091,000
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	55,667,000		31,728,000
ERROR in label resolution.
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	39,871,000		18,328,000
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	68,803,000		$ 144,250,000
Counterparty default losses on forward contracts	$ 0	$ 0