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Investment Securities - Schedule of Held to Maturity Securities Been in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 2,753 | $ 1,461
12 Months or Greater | 386,952 | 385,894
Total | 389,705 | 387,355
Gross Unrealized Losses |  |
Less Than 12 Months | (29) | (78)
12 Months or Greater | (34,625) | (43,733)
Total | (34,654) | (43,811)
U.S. treasury securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 92,731 | 90,094
Total | 92,731 | 90,094
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (1,846) | (3,212)
Total | (1,846) | (3,212)
U.S. agency securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 15,178 | 14,858
Total | 15,178 | 14,858
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (1,006) | (1,424)
Total | (1,006) | (1,424)
State, county & municipal securities |  |
Fair Value |  |
Less Than 12 Months | 2,753 | 1,461
12 Months or Greater | 106,680 | 103,500
Total | 109,433 | 104,961
Gross Unrealized Losses |  |
Less Than 12 Months | (29) | (78)
12 Months or Greater | (11,257) | (13,781)
Total | (11,286) | (13,859)
Mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 172,363 | 177,442
Total | 172,363 | 177,442
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (20,516) | (25,316)
Total | $ (20,516) | $ (25,316)

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