FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 4) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Carrying amount and estimated fair value of financial instruments
Fair Value	$ 1,364,734	$ 1,020,744
Restricted stock	16,200	14,812
Accrued interest receivable	16,946	16,957
Deposits	(4,409,569)	(3,755,945)
Level 1
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	24,901	25,645
Fair Value	0	0
Level 2
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	657,906	631,825
Fair Value	1,357,737	1,015,713
Accrued interest receivable	4,709	3,521
Deposits	(4,418,117)	(3,763,358)
Short-term borrowings	(93,374)	(116,061)
Other borrowings	(16,483)	(6,297)
Accrued interest payable	(687)	(1,033)
Level 3
Carrying amount and estimated fair value of financial instruments
Fair Value	6,997	5,031
Loans, net	2,682,257	2,560,683
Accrued interest receivable	12,237	13,436
Reported Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	682,807	657,470
Fair Value	1,364,734	1,020,744
Restricted stock	16,200	14,812
Loans, net	2,767,590	2,563,242
Accrued interest receivable	16,946	16,957
Deposits	(4,409,569)	(3,755,945)
Short-term borrowings	(93,374)	(116,061)
Other borrowings	(15,937)	(5,859)
Accrued interest payable	(687)	(1,033)
Estimate of Fair Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	682,807	657,470
Fair Value	1,364,734	1,020,744
Loans, net	2,682,257	2,560,683
Accrued interest receivable	16,946	16,957
Deposits	(4,418,117)	(3,763,358)
Short-term borrowings	(93,374)	(116,061)
Other borrowings	(16,483)	(6,297)
Accrued interest payable	$ (687)	$ (1,033)