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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands	Sep. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less Than 12 Months	$ 95,519	$ 100,011
Unrealized Losses - Less Than 12 Months	(304)	(599)
Fair Value - 12 Months of More	159,818	621,294
Unrealized Losses - 12 Months or More	(2,437)	(23,937)
Fair Value	255,337	721,305
Unrealized losses	$ (2,741)	$ (24,536)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security		2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	78	300
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 509
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(5)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		411
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(19)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		920
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		(24)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less Than 12 Months	$ 24,439	36,218
Unrealized Losses - Less Than 12 Months	(169)	(281)
Fair Value - 12 Months of More	0	28,437
Unrealized Losses - 12 Months or More	0	(613)
Fair Value	24,439	64,655
Unrealized losses	$ (169)	$ (894)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security		2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	9	114
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 509
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(5)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		411
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(19)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		920
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		(24)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less Than 12 Months	$ 36,108	46,459
Unrealized Losses - Less Than 12 Months	(50)	(252)
Fair Value - 12 Months of More	86,109	364,430
Unrealized Losses - 12 Months or More	(788)	(13,272)
Fair Value	122,217	410,889
Unrealized losses	$ (838)	$ (13,524)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	40	117
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less Than 12 Months	$ 34,972	$ 5,956
Unrealized Losses - Less Than 12 Months	(85)	(40)
Fair Value - 12 Months of More	73,709	227,461
Unrealized Losses - 12 Months or More	(1,649)	(10,031)
Fair Value	108,681	233,417
Unrealized losses	$ (1,734)	$ (10,071)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	29	63
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value - Less Than 12 Months		$ 11,378
Unrealized Losses - Less Than 12 Months		(26)
Fair Value - 12 Months of More		966
Unrealized Losses - 12 Months or More		(21)
Fair Value		12,344
Unrealized losses		$ (47)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security		6

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