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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
AFS Investments (carried at fair value):
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	$ 913,523	$ 910,692
HTM Investments (carried at amortized cost):
Amortized Cost	1,303	1,307
Unrealized Gains	49	8
Unrealized Losses	0	(24)
Fair Value	1,352	1,291
Obligations of states and political subdivisions
AFS Investments (carried at fair value):
Amortized Cost	109,519	94,430
Unrealized Gains	2,649	216
Unrealized Losses	(169)	(894)
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	111,999	93,752
HTM Investments (carried at amortized cost):
Amortized Cost	1,303	1,307
Unrealized Gains	49	8
Unrealized Losses	0	(24)
Fair Value	1,352	1,291
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
AFS Investments (carried at fair value):
Amortized Cost	449,112	466,613
Unrealized Gains	5,799	583
Unrealized Losses	(838)	(13,524)
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	454,073	453,672
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
AFS Investments (carried at fair value):
Amortized Cost	335,797	351,958
Unrealized Gains	3,653	1,007
Unrealized Losses	(1,734)	(10,071)
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	337,716	342,894
Subordinated corporate bonds
AFS Investments (carried at fair value):
Amortized Cost	9,560	20,398
Unrealized Gains	175	23
Unrealized Losses	0	(47)
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	9,735	20,374
Total AFS investments
AFS Investments (carried at fair value):
Amortized Cost	903,988	933,399
Unrealized Gains	12,276	1,829
Unrealized Losses	(2,741)	(24,536)
Available-for-sale securities, at fair value (book value of $903,988 and $933,399, respectively)	$ 913,523	$ 910,692

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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