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Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months | $ 142,900 | $ 63,957
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer | 125,631 | 199,479
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 268,531 | 263,436
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months | 193 | 196
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer | 1,364 | 3,121
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | 1,557 | 3,317
Treasury notes |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months | 3,092 | 3,052
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer | 26,938 | 32,080
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 30,030 | 35,132
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months | 1 | 6
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer | 57 | 332
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | 58 | 338
Federal agencies |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months | 139,808 | 60,541
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer | 98,693 | 167,213
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 238,501 | 227,754
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months | 192 | 189
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer | 1,307 | 2,787
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total | $ 1,499 | 2,976
Mortgage-backed - Agency |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months |  | 364
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer |  | 186
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total |  | 550
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses |  |
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months |  | 1
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer |  | 2
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total |  | $ 3

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