COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Reserve for Unfunded Loan Commitments	$ 10,100,000		$ 10,100,000		$ 13,300,000
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 [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	3,443,004,000		$ 3,443,004,000		3,207,072,000
Financial Standby Letter of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	20,987,000		20,987,000		18,415,000
Loan Origination Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	106,989,000		106,989,000		101,426,000
Risk Participation Agreement [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	40,325,000		40,325,000		40,949,000
Loans Held for Sale Origination Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	139,578,000		139,578,000		169,653,000
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	55,641,000		55,641,000		79,414,000
Counterparty default losses on forward contracts	0	$ 0	0	$ 0
Commitments to Sell Mortgage Backed Securities [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	142,500,000		142,500,000		204,000,000
Amount funded out of a total commitment to invest [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other Commitment	5,500,000		5,500,000		2,800,000
Other Commitments [Line Items]
Other Commitment	5,500,000		5,500,000		2,800,000
Other Commitment, 2021 Agreement	555,000		555,000
Other Commitment, 2021 Agreement	555,000		555,000
Amount unfunded out of a total commitment to invest [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other Commitment	4,500,000		4,500,000		7,200,000
Other Commitments [Line Items]
Other Commitment	4,500,000		4,500,000		$ 7,200,000
Other Commitment, 2021 Agreement	3,900,000		3,900,000
Other Commitment, 2021 Agreement	3,900,000		3,900,000
Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other Commitment	4,500,000		4,500,000
Other Commitments [Line Items]
Other Commitment	$ 4,500,000		$ 4,500,000