SECURITIES: (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Less Than 12 Months
Fair Value	$ 266,768	$ 464,602
Unrealized Losses	(2,112)	(11,155)
More Than 12 Months
Fair Value	222,763	80,151
Unrealized Losses	(7,423)	(3,259)
Total
Fair Value	489,531	544,753
Unrealized Losses	(9,535)	(14,414)
U.S. Government entity mortgage-backed securities
Less Than 12 Months
Fair Value	9,321
Unrealized Losses	(86)
More Than 12 Months
Fair Value	3,538
Unrealized Losses	(232)
Total
Fair Value	12,859
Unrealized Losses	(318)
Mortgage-backed securities, residential
Less Than 12 Months
Fair Value	79,918	12,224
Unrealized Losses	(425)	(377)
More Than 12 Months
Fair Value	53,815	0
Unrealized Losses	(1,387)	0
Total
Fair Value	133,733	12,224
Unrealized Losses	(1,812)	(377)
Mortgage-backed securities, commercial
Less Than 12 Months
Fair Value		202,248
Unrealized Losses		(4,072)
More Than 12 Months
Fair Value		152
Unrealized Losses		(1)
Total
Fair Value		202,400
Unrealized Losses		(4,073)
Collateralized mortgage obligations
Less Than 12 Months
Fair Value	150,182	169,717
Unrealized Losses	(1,418)	(3,086)
More Than 12 Months
Fair Value	146,750	79,999
Unrealized Losses	(5,287)	(3,258)
Total
Fair Value	296,932	249,716
Unrealized Losses	(6,705)	(6,344)
State and municipal obligations
Less Than 12 Months
Fair Value	27,347	72,852
Unrealized Losses	(183)	(2,396)
More Than 12 Months
Fair Value	18,660	0
Unrealized Losses	(517)	0
Total
Fair Value	46,007	72,852
Unrealized Losses	$ (700)	(2,396)
Collateralized debt obligations
Less Than 12 Months
Fair Value		7,561
Unrealized Losses		(1,224)
More Than 12 Months
Fair Value		0
Unrealized Losses		0
Total
Fair Value		7,561
Unrealized Losses		$ (1,224)