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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
AFS Investments (carried at fair value):
Available-for-sale securities, at fair value	$ 799,000	$ 789,899
HTM Investments (carried at amortized cost):
Amortized Cost	93,062	94,073
Unrealized Gains	133	1,077
Unrealized Losses	(1,594)	(237)
Fair Value	91,601	94,913
Obligations of states and political subdivisions
AFS Investments (carried at fair value):
Amortized Cost	4,779	7,232
Unrealized Gains	56	103
Unrealized Losses	(3)	0
Available-for-sale securities, at fair value	4,832	7,335
HTM Investments (carried at amortized cost):
Amortized Cost	93,062	94,073
Unrealized Gains	133	1,077
Unrealized Losses	(1,594)	(237)
Fair Value	91,601	94,913
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
AFS Investments (carried at fair value):
Amortized Cost	512,595	510,176
Unrealized Gains	386	597
Unrealized Losses	(17,713)	(7,471)
Available-for-sale securities, at fair value	495,268	503,302
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
AFS Investments (carried at fair value):
Amortized Cost	305,690	279,575
Unrealized Gains	47	14
Unrealized Losses	(12,383)	(6,790)
Available-for-sale securities, at fair value	293,354	272,799
Subordinated corporate bonds
AFS Investments (carried at fair value):
Amortized Cost	5,485	5,484
Unrealized Gains	82	173
Unrealized Losses	(21)	0
Available-for-sale securities, at fair value	5,546	5,657
Equity investments
AFS Investments (carried at fair value):
Amortized Cost		554
Unrealized Gains		252
Unrealized Losses		0
Available-for-sale securities, at fair value		806
Total AFS investments
AFS Investments (carried at fair value):
Amortized Cost	828,549	803,021
Unrealized Gains	571	1,139
Unrealized Losses	(30,120)	(14,261)
Available-for-sale securities, at fair value	$ 799,000	$ 789,899

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