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Investment Securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 187,815 | $ 203,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,014 | 5,992
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 0 | 766
Less than 12 Months, Unrealized Losses | 0 | 2
12 Months or More, Fair Value | 21,784 | 21,742
12 Months or More, Unrealized Losses | 240 | 779
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 730 | 19,389
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 56
U.S. Treasury notes [Member] |  |
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,257 | 2,235
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19 | 43
Held-to-Maturity: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
U.S. Agency notes [Member] |  |
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 74,450 | 73,351
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,231 | 2,361
Held-to-Maturity: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 4,988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 7
U.S. Agency mortgage-backed securities [Member] |  |
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 54,245 | 55,217
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,161 | 1,981
Held-to-Maturity: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 111 | 137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Non-taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 43,862 | 58,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 515 | 1,373
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 0 | 366
Less than 12 Months, Unrealized Losses | 0 | 1
12 Months or More, Fair Value | 18,537 | 18,588
12 Months or More, Unrealized Losses | 187 | 634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 619 | 14,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 49
Taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,001 | 14,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 88 | 234
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 0 | 400
Less than 12 Months, Unrealized Losses | 0 | 1
12 Months or More, Fair Value | 3,247 | 3,154
12 Months or More, Unrealized Losses | 53 | 145
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0

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