INVESTMENT SECURITIES (Schedule of Securities with Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Approximate Fair Value
Less Than 12 Months	$ 186,246	$ 154,568
12 Months or Longer	141,176	99,807
Total	327,422	254,375
Unrealized Losses
Less Than 12 Months	(3,137)	(1,414)
12 Months or Longer	(4,841)	(2,265)
Total	(7,978)	(3,679)
U.S. Government-Sponsored Entities [Member]
Approximate Fair Value
Less Than 12 Months	53,581	32,166
12 Months or Longer	35,699	11,535
Total	89,280	43,701
Unrealized Losses
Less Than 12 Months	(1,100)	(317)
12 Months or Longer	(1,291)	(458)
Total	(2,391)	(775)
Mortgage-Backed Securities-Residential [Member]
Approximate Fair Value
Less Than 12 Months	130,938	116,774
12 Months or Longer	94,037	71,646
Total	224,975	188,420
Unrealized Losses
Less Than 12 Months	(2,033)	(1,000)
12 Months or Longer	(3,310)	(1,380)
Total	(5,343)	(2,380)
SBA Pool Securities [Member]
Approximate Fair Value
Less Than 12 Months
12 Months or Longer	4,182	5,205
Total	4,182	5,205
Unrealized Losses
Less Than 12 Months
12 Months or Longer	(47)	(57)
Total	(47)	(57)
State and Political Subdivisions [Member]
Approximate Fair Value
Less Than 12 Months	1,727	5,628
12 Months or Longer	7,258	3,760
Total	8,985	9,388
Unrealized Losses
Less Than 12 Months	(4)	(97)
12 Months or Longer	(193)	(32)
Total	$ (197)	(129)
Single-Issuer Trust Preferred Security [Member]
Approximate Fair Value
Less Than 12 Months
12 Months or Longer		2,837
Total		2,837
Unrealized Losses
Less Than 12 Months
12 Months or Longer		(162)
Total		(162)
CRA Investment Fund [Member]
Approximate Fair Value
Less Than 12 Months
12 Months or Longer		4,824
Total		4,824
Unrealized Losses
Less Than 12 Months
12 Months or Longer		(176)
Total		$ (176)