COMMITMENTS AND CONTINGENCIES (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Operating Leases, Number of Properties Subject to Non-cancelable Operating Leases	107
Reserve for Unfunded Loan Commitments	$ 2,700,000	$ 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
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	$ 3,051,681,000	2,837,981,000
Standby letters of credit and financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	14,298,000	17,784,000
Commitments to originate loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	39,676,000	32,145,000
Risk Participation Agreement [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	41,022,000	24,091,000
Commitments to originate loans held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	66,196,000	31,728,000
Commitments to sell loans secured by one- to four-family residential properties
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	70,895,000	18,328,000
Loss on Contract Termination for Default	0
Commitments to sell securities related to mortgage banking activities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	239,320,000	$ 144,250,000
Limited Partner [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off Balance Sheet Risks, Total Amount, Commitment	10,000,000
Fair Value Disclosure, Off Balance Sheet Risk, Amount Funded, Commitment	467,000
Fair Value Disclosure, Off Balance Sheet Risk, Unfunded Amount, Commitment	$ 9,500,000