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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 18,497 | $ 13,604
Less than 12 Months, Unrealized Loss | (256) | (176)
12 Months or More, Fair Value | 1,452,208 | 1,494,312
12 Months or More, Unrealized Loss | (299,724) | (275,589)
Total Fair Value | 1,470,705 | 1,507,916
Total Unrealized Loss | (299,980) | (275,765)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 18,497 | 13,469
Less than 12 Months, Unrealized Loss | (256) | (175)
12 Months or More, Fair Value | 653,099 | 668,223
12 Months or More, Unrealized Loss | (137,716) | (122,199)
Total Fair Value | 671,596 | 681,692
Total Unrealized Loss | (137,972) | (122,374)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 135
Less than 12 Months, Unrealized Loss | 0 | (1)
12 Months or More, Fair Value | 621,301 | 643,172
12 Months or More, Unrealized Loss | (123,251) | (116,012)
Total Fair Value | 621,301 | 643,307
Total Unrealized Loss | (123,251) | (116,013)
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Loss | 0 | 0
12 Months or More, Fair Value | 177,808 | 182,917
12 Months or More, Unrealized Loss | (38,757) | (37,378)
Total Fair Value | 177,808 | 182,917
Total Unrealized Loss | $ (38,757) | $ (37,378)

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