PARENT COMPANY CONDENSED FINANCIAL STATEMENTS: (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 682,807	$ 657,470
Land and headquarters building, net	69,522	62,063
Other assets	45,728	37,530
TOTAL ASSETS	5,175,099	4,560,520
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other liabilities	73,643	85,663
TOTAL LIABILITIES	4,592,523	3,963,528
Shareholders' Equity	582,576	596,992	$ 557,608	$ 442,701
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	5,175,099	4,560,520
Parent
ASSETS
Cash and due from banks	13,844	2,480
Investments in subsidiaries	571,986	597,888
Land and headquarters building, net	4,423	4,614
Other assets	7,518	6,000
TOTAL ASSETS	597,771	610,982
LIABILITIES AND SHAREHOLDERS’ EQUITY
Dividends payable	7,952	7,182
Other liabilities	7,243	6,808
TOTAL LIABILITIES	15,195	13,990
Shareholders' Equity	582,576	596,992
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 597,771	$ 610,982