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INVESTMENT SECURITIES AVAILABLE FOR SALE (Schedule of Securities with Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Approximate Fair Value |  |
Less Than 12 Months | $ 154,568 | $ 183,973
12 Months or Longer | 99,807 | 17,364
Total | 254,375 | 201,337
Unrealized Losses |  |
Less Than 12 Months | (1,414) | (2,290)
12 Months or Longer | (2,265) | (601)
Total | (3,679) | (2,891)
U.S. Government-Sponsored Entities [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 32,166 | 21,517
12 Months or Longer | 11,535 |
Total | 43,701 | 21,517
Unrealized Losses |  |
Less Than 12 Months | (317) | (474)
12 Months or Longer | (458) |
Total | (775) | (474)
Mortgage-Backed Securities-Residential [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 116,774 | 151,114
12 Months or Longer | 71,646 | 5,147
Total | 188,420 | 156,261
Unrealized Losses |  |
Less Than 12 Months | (1,000) | (1,472)
12 Months or Longer | (1,380) | (42)
Total | (2,380) | (1,514)
SBA Pool Securities [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months |  |
12 Months or Longer | 5,205 | 6,713
Total | 5,205 | 6,713
Unrealized Losses |  |
Less Than 12 Months |  |
12 Months or Longer | (57) | (65)
Total | (57) | (65)
State and Political Subdivisions [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 5,628 | 9,412
12 Months or Longer | 3,760 |
Total | 9,388 | 9,412
Unrealized Losses |  |
Less Than 12 Months | (97) | (274)
12 Months or Longer | (32) |
Total | (129) | (274)
Single-Issuer Trust Preferred Security [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months |  |
12 Months or Longer | 2,837 | 2,610
Total | 2,837 | 2,610
Unrealized Losses |  |
Less Than 12 Months |  |
12 Months or Longer | (162) | (389)
Total | (162) | (389)
CRA Investment Fund [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months |  | 1,930
12 Months or Longer | 4,824 | 2,894
Total | 4,824 | 4,824
Unrealized Losses |  |
Less Than 12 Months |  | (70)
12 Months or Longer | (176) | (105)
Total | $ (176) | $ (175)

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