Loans and the Allowance for Loan Losses (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) Loans	Dec. 31, 2019 USD ($)
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]
PPP Loans	$ 474,000
Non Accrual Contractual Due	90 days
Loans Pledged as Collateral	$ 2,700,000	$ 2,500,000
Loans performing under the restructured terms	18,300	21,400
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	29,500	30,600
Troubled debt restructurings	47,800	52,000
Specific allowance	$ 4,400	$ 23
Number of deferred loans | Loans	199
Deferred loan	$ 355,167
Minimum [Member]
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]
Deferred period of loan	90 days
Maximum [Member]
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]
Deferred period of loan	120 days