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Investment Securities - Held to Maturity Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 5,756 | $ 1,461
12 Months or Greater | 380,859 | 385,894
Total | 386,615 | 387,355
Gross Unrealized Losses |  |
Less Than 12 Months | (41) | (78)
12 Months or Greater | (48,439) | (43,733)
Total | (48,480) | (43,811)
U.S. treasury securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 89,733 | 90,094
Total | 89,733 | 90,094
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (3,995) | (3,212)
Total | (3,995) | (3,212)
U.S. agency securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 14,748 | 14,858
Total | 14,748 | 14,858
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (1,502) | (1,424)
Total | (1,502) | (1,424)
State, county & municipal securities |  |
Fair Value |  |
Less Than 12 Months | 5,756 | 1,461
12 Months or Greater | 104,271 | 103,500
Total | 110,027 | 104,961
Gross Unrealized Losses |  |
Less Than 12 Months | (41) | (78)
12 Months or Greater | (14,686) | (13,781)
Total | (14,727) | (13,859)
Mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | 172,107 | 177,442
Total | 172,107 | 177,442
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Greater | (28,256) | (25,316)
Total | $ (28,256) | $ (25,316)

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