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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 6 | 6
Fair Value, Less than 12 Months | $ 14,414 | $ 6,819
Unrealized Losses, Less than 12 Months | $ (132) | $ (222)
Number of positions, 12 Months or More | security | 128 | 127
Fair value, 12 Months or More | $ 665,042 | $ 685,774
Unrealized Losses, 12 Months or More | $ (146,200) | $ (139,572)
Number of positions | security | 134 | 133
Fair Value | $ 679,456 | $ 692,593
Unrealized Losses | $ (146,332) | $ (139,794)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 2,372 | $ 2,807
Unrealized Losses, Less than 12 Months | $ (16) | $ (25)
Number of positions, 12 Months or More | security | 235 | 234
Fair Value, 12 Months or More | $ 1,081,000 | $ 1,117,285
Unrealized Losses, 12 Months or More | $ (114,093) | $ (99,715)
Number of positions | security | 236 | 236
Fair Value | $ 1,083,372 | $ 1,120,092
Unrealized Losses | $ (114,109) | $ (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 | $ 13,253 | $ 15,198
Unrealized Losses, 12 Months or More | $ (1,994) | $ (1,881)
Number of positions | security | 7 | 12
Fair Value | $ 13,253 | $ 18,112
Unrealized Losses | $ (1,994) | $ (1,883)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 2,372 | $ 2,807
Unrealized Losses, Less than 12 Months | $ (16) | $ (25)
Number of positions, 12 Months or More | security | 127 | 126
Fair Value, 12 Months or More | $ 245,670 | $ 249,995
Unrealized Losses, 12 Months or More | $ (37,534) | $ (33,663)
Number of positions | security | 128 | 128
Fair Value | $ 248,042 | $ 252,802
Unrealized Losses | $ (37,550) | $ (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 | 21 | 19
Fair value, 12 Months or More | $ 37,296 | $ 35,072
Unrealized Losses, 12 Months or More | $ (4,431) | $ (4,263)
Number of positions | security | 21 | 21
Fair Value | $ 37,296 | $ 38,171
Unrealized Losses | $ (4,431) | $ (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 | $ 52,167 | $ 54,254
Unrealized Losses, 12 Months or More | $ (4,656) | $ (4,119)
Number of positions | security | 10 | 10
Fair Value | $ 52,167 | $ 54,254
Unrealized Losses | $ (4,656) | $ (4,119)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 4 | 1
Fair Value, Less than 12 Months | $ 6,720 | $ 806
Unrealized Losses, Less than 12 Months | $ (45) | $ (25)
Number of positions, 12 Months or More | security | 36 | 35
Fair value, 12 Months or More | $ 161,215 | $ 166,963
Unrealized Losses, 12 Months or More | $ (26,028) | $ (24,943)
Number of positions | security | 40 | 36
Fair Value | $ 167,935 | $ 167,769
Unrealized Losses | $ (26,073) | $ (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 | 70 | 70
Fair Value, 12 Months or More | $ 390,021 | $ 405,950
Unrealized Losses, 12 Months or More | $ (24,465) | $ (20,314)
Number of positions | security | 70 | 70
Fair Value | $ 390,021 | $ 405,950
Unrealized Losses | $ (24,465) | $ (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 | $ 5,344 | $ 5,392
Unrealized Losses, 12 Months or More | $ (679) | $ (637)
Number of positions | security | 2 | 2
Fair Value | $ 5,344 | $ 5,392
Unrealized Losses | $ (679) | $ (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 | $ 13,921 | $ 14,011
Unrealized Losses, 12 Months or More | $ (3,056) | $ (2,972)
Number of positions | security | 1 | 1
Fair Value | $ 13,921 | $ 14,011
Unrealized Losses | $ (3,056) | $ (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 | $ 340,806 | $ 354,574
Unrealized Losses, 12 Months or More | $ (90,453) | $ (85,883)
Number of positions | security | 37 | 37
Fair Value | $ 340,806 | $ 354,574
Unrealized Losses | $ (90,453) | $ (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 | $ 342,272 | $ 355,538
Unrealized Losses, 12 Months or More | $ (36,971) | $ (31,670)
Number of positions | security | 18 | 18
Fair Value | $ 342,272 | $ 355,538
Unrealized Losses | $ (36,971) | $ (31,670)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 0
Fair Value, Less than 12 Months | $ 7,694 | $ 0
Unrealized Losses, Less than 12 Months | $ (87) | $ 0
Number of positions, 12 Months or More | security | 25 | 25
Fair value, 12 Months or More | $ 107,128 | $ 108,575
Unrealized Losses, 12 Months or More | $ (22,615) | $ (21,965)
Number of positions | security | 27 | 25
Fair Value | $ 114,822 | $ 108,575
Unrealized Losses | $ (22,702) | $ (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 | $ 36,949 | $ 37,537
Unrealized Losses, 12 Months or More | $ (7,411) | $ (6,977)
Number of positions | security | 9 | 9
Fair Value | $ 36,949 | $ 37,537
Unrealized Losses | $ (7,411) | $ (6,977)

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