LOANS: (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,812,601	$ 2,606,113
Deferred costs, net	3,294	4,181
Allowance for credit losses	(48,305)	(44,076)	$ (19,943)	$ (20,436)
TOTAL	2,767,590	2,566,218
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,674,066	1,521,711
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	664,509	604,652
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 474,026	$ 479,750