Loans and the Allowance for Credit Losses (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 02, 2021 USD ($)	Mar. 31, 2021 USD ($) Loans	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Loans
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]
PPP Loans		$ 522,300		$ 397,500
Non Accrual Contractual Due		90 days
Loans Pledged as Collateral		$ 2,600,000		2,700,000
Provision for credit losses	$ 6,600	5,300
Loans performing under the restructured terms		25,500		23,700
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		27,500		25,700
Troubled debt restructurings		53,000		$ 49,400
Specific allowance of TDR's		$ 10,000	$ 47
Number of deferred loans | Loans		102		113
Deferred loan		$ 204,203		$ 207,100
Special Mention [Member]
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]
Deferred loan		$ 44,100