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Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 1,062,649 | $ 1,735,000
Gross Unrealized Gains | 424 | 241
Gross Unrealized Losses | (139,794) | (201,299)
Fair Value | 923,279 | 1,533,942
Obligations of other U.S. Government agencies and corporations |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost |  | 170,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (5,340)
Fair Value |  | 164,660
Obligations of states and political subdivisions |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 36,374 | 154,066
Gross Unrealized Gains | 119 | 204
Gross Unrealized Losses | (1,883) | (9,368)
Fair Value | 34,610 | 144,902
Other debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 72,383 | 74,885
Gross Unrealized Gains | 109 | 0
Gross Unrealized Losses | (4,458) | (4,049)
Fair Value | 68,034 | 70,836
Government agency mortgage-backed securities | Residential mortgage-backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 301,400 | 508,415
Gross Unrealized Gains | 172 | 37
Gross Unrealized Losses | (24,968) | (52,036)
Fair Value | 276,604 | 456,416
Government agency mortgage-backed securities | Commercial mortgage-backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 6,029 | 11,166
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (637) | (1,053)
Fair Value | 5,392 | 10,113
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 485,164 | 605,033
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (85,883) | (103,864)
Fair Value | 399,281 | 501,169
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 161,299 | 211,435
Gross Unrealized Gains | 24 | 0
Gross Unrealized Losses | (21,965) | (25,589)
Fair Value | $ 139,358 | $ 185,846

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