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Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Less Than 12 Months, Fair Value | $ 175,807 | $ 67,226
Less Than 12 Months, Unrealized Losses | (3,448) | (732)
12 Months or Longer, Fair Value | 274,771 | 279,131
12 Months or Longer, Unrealized Losses | (19,414) | (8,374)
Total, Fair Value | 450,578 | 346,357
Total, Unrealized Losses | (22,862) | (9,106)
Held-to-maturity securities, Less Than 12 Months, Fair Value | 15,986 | 8,255
Held-to-maturity securities, Less Than 12 Months, Unrealized Losses | (714) | (357)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 0 | 0
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | 0 | 0
Held-to-maturity securities, Total, Fair Value | 15,986 | 8,255
Held-to-maturity securities, Total, Unrealized Losses | (714) | (357)
U.S. Government-sponsored agencies |  |
Less Than 12 Months, Fair Value | 75,589 | 30,194
Less Than 12 Months, Unrealized Losses | (1,019) | (256)
12 Months or Longer, Fair Value | 31,049 | 22,824
12 Months or Longer, Unrealized Losses | (1,417) | (509)
Total, Fair Value | 106,638 | 53,018
Total, Unrealized Losses | (2,436) | (765)
Municipal securities |  |
Less Than 12 Months, Fair Value | 30,647 | 5,638
Less Than 12 Months, Unrealized Losses | (1,292) | (77)
12 Months or Longer, Fair Value | 56,008 | 57,128
12 Months or Longer, Unrealized Losses | (4,827) | (1,282)
Total, Fair Value | 86,655 | 62,766
Total, Unrealized Losses | (6,119) | (1,359)
Held-to-maturity securities, Less Than 12 Months, Fair Value | 9,519 | 8,255
Held-to-maturity securities, Less Than 12 Months, Unrealized Losses | (640) | (357)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 0 | 0
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | 0 | 0
Held-to-maturity securities, Total, Fair Value | 9,519 | 8,255
Held-to-maturity securities, Total, Unrealized Losses | (640) | (357)
Mortgage-backed securities |  |
Less Than 12 Months, Fair Value | 55,063 | 29,542
Less Than 12 Months, Unrealized Losses | (1,061) | (251)
12 Months or Longer, Fair Value | 167,901 | 177,266
12 Months or Longer, Unrealized Losses | (10,983) | (5,496)
Total, Fair Value | 222,964 | 206,808
Total, Unrealized Losses | (12,044) | (5,747)
Asset-backed securities |  |
Less Than 12 Months, Fair Value | 4,960 |
Less Than 12 Months, Unrealized Losses | (43) |
12 Months or Longer, Fair Value | 0 |
12 Months or Longer, Unrealized Losses | 0 |
Total, Fair Value | 4,960 |
Total, Unrealized Losses | (43) |
Corporate securities |  |
Less Than 12 Months, Fair Value | 9,548 | 1,852
Less Than 12 Months, Unrealized Losses | (33) | (148)
12 Months or Longer, Fair Value | 19,813 | 18,981
12 Months or Longer, Unrealized Losses | (2,187) | (1,019)
Total, Fair Value | 29,361 | 20,833
Total, Unrealized Losses | (2,220) | (1,167)
Held-to-maturity securities, Less Than 12 Months, Fair Value | 6,467 |
Held-to-maturity securities, Less Than 12 Months, Unrealized Losses | (74) |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 0 |
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | 0 |
Held-to-maturity securities, Total, Fair Value | 6,467 |
Held-to-maturity securities, Total, Unrealized Losses | $ (74) |
Other securities |  |
Less Than 12 Months, Fair Value |  | 0
Less Than 12 Months, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 2,932
12 Months or Longer, Unrealized Losses |  | (68)
Total, Fair Value |  | 2,932
Total, Unrealized Losses |  | $ (68)

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