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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 6
Fair Value, Less than 12 Months | $ 3,914 | $ 6,819
Unrealized Losses, Less than 12 Months | $ (61) | $ (222)
Number of positions, 12 Months or More | security | 123 | 127
Fair value, 12 Months or More | $ 649,867 | $ 685,774
Unrealized Losses, 12 Months or More | $ (114,841) | $ (139,572)
Number of positions | security | 125 | 133
Fair Value | $ 653,781 | $ 692,593
Unrealized Losses | $ (114,902) | $ (139,794)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 2,370 | $ 2,807
Unrealized Losses, Less than 12 Months | $ (10) | $ (25)
Number of positions, 12 Months or More | security | 234 | 234
Fair Value, 12 Months or More | $ 1,047,324 | $ 1,117,285
Unrealized Losses, 12 Months or More | $ (81,637) | $ (99,715)
Number of positions | security | 235 | 236
Fair Value | $ 1,049,694 | $ 1,120,092
Unrealized Losses | $ (81,647) | $ (99,740)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 3
Fair Value, Less than 12 Months | $ 0 | $ 2,914
Unrealized Losses, Less than 12 Months | $ 0 | $ (2)
Number of positions, 12 Months or More | security | 7 | 9
Fair value, 12 Months or More | $ 13,278 | $ 15,198
Unrealized Losses, 12 Months or More | $ (1,878) | $ (1,881)
Number of positions | security | 7 | 12
Fair Value | $ 13,278 | $ 18,112
Unrealized Losses | $ (1,878) | $ (1,883)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 2,370 | $ 2,807
Unrealized Losses, Less than 12 Months | $ (10) | $ (25)
Number of positions, 12 Months or More | security | 127 | 126
Fair Value, 12 Months or More | $ 246,559 | $ 249,995
Unrealized Losses, 12 Months or More | $ (34,851) | $ (33,663)
Number of positions | security | 128 | 128
Fair Value | $ 248,929 | $ 252,802
Unrealized Losses | $ (34,861) | $ (33,688)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 2
Fair Value, Less than 12 Months | $ 0 | $ 3,099
Unrealized Losses, Less than 12 Months | $ 0 | $ (195)
Number of positions, 12 Months or More | security | 18 | 19
Fair value, 12 Months or More | $ 34,337 | $ 35,072
Unrealized Losses, 12 Months or More | $ (2,676) | $ (4,263)
Number of positions | security | 18 | 21
Fair Value | $ 34,337 | $ 38,171
Unrealized Losses | $ (2,676) | $ (4,458)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 10 | 10
Fair Value, 12 Months or More | $ 51,854 | $ 54,254
Unrealized Losses, 12 Months or More | $ (2,578) | $ (4,119)
Number of positions | security | 10 | 10
Fair Value | $ 51,854 | $ 54,254
Unrealized Losses | $ (2,578) | $ (4,119)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 1
Fair Value, Less than 12 Months | $ 3,914 | $ 806
Unrealized Losses, Less than 12 Months | $ (61) | $ (25)
Number of positions, 12 Months or More | security | 34 | 35
Fair value, 12 Months or More | $ 152,229 | $ 166,963
Unrealized Losses, 12 Months or More | $ (19,116) | $ (24,943)
Number of positions | security | 36 | 36
Fair Value | $ 156,143 | $ 167,769
Unrealized Losses | $ (19,177) | $ (24,968)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 69 | 70
Fair Value, 12 Months or More | $ 357,350 | $ 405,950
Unrealized Losses, 12 Months or More | $ (11,742) | $ (20,314)
Number of positions | security | 69 | 70
Fair Value | $ 357,350 | $ 405,950
Unrealized Losses | $ (11,742) | $ (20,314)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 5,543 | $ 5,392
Unrealized Losses, 12 Months or More | $ (466) | $ (637)
Number of positions | security | 2 | 2
Fair Value | $ 5,543 | $ 5,392
Unrealized Losses | $ (466) | $ (637)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 1 | 1
Fair Value, 12 Months or More | $ 14,562 | $ 14,011
Unrealized Losses, 12 Months or More | $ (2,404) | $ (2,972)
Number of positions | security | 1 | 1
Fair Value | $ 14,562 | $ 14,011
Unrealized Losses | $ (2,404) | $ (2,972)
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 37 | 37
Fair value, 12 Months or More | $ 336,883 | $ 354,574
Unrealized Losses, 12 Months or More | $ (71,481) | $ (85,883)
Number of positions | security | 37 | 37
Fair Value | $ 336,883 | $ 354,574
Unrealized Losses | $ (71,481) | $ (85,883)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 18 | 18
Fair Value, 12 Months or More | $ 339,359 | $ 355,538
Unrealized Losses, 12 Months or More | $ (23,736) | $ (31,670)
Number of positions | security | 18 | 18
Fair Value | $ 339,359 | $ 355,538
Unrealized Losses | $ (23,736) | $ (31,670)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 25 | 25
Fair value, 12 Months or More | $ 107,597 | $ 108,575
Unrealized Losses, 12 Months or More | $ (19,224) | $ (21,965)
Number of positions | security | 25 | 25
Fair Value | $ 107,597 | $ 108,575
Unrealized Losses | $ (19,224) | $ (21,965)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 9 | 9
Fair Value, 12 Months or More | $ 37,640 | $ 37,537
Unrealized Losses, 12 Months or More | $ (6,326) | $ (6,977)
Number of positions | security | 9 | 9
Fair Value | $ 37,640 | $ 37,537
Unrealized Losses | $ (6,326) | $ (6,977)

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