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Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 1,735,000 | $ 2,400,956
Gross Unrealized Gains | 241 | 16,120
Gross Unrealized Losses | (201,299) | (31,024)
Fair Value | 1,533,942 | 2,386,052
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 | 154,066 | 153,847
Gross Unrealized Gains | 204 | 5,532
Gross Unrealized Losses | (9,368) | (269)
Fair Value | 144,902 | 159,110
Other debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 74,885 | 36,515
Gross Unrealized Gains | 0 | 1,097
Gross Unrealized Losses | (4,049) | (148)
Fair Value | 70,836 | 37,464
U.S. Treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost |  | 3,007
Gross Unrealized Gains |  | 3
Gross Unrealized Losses |  | 0
Fair Value |  | 3,010
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 508,415 | 967,497
Gross Unrealized Gains | 37 | 7,854
Gross Unrealized Losses | (52,036) | (6,816)
Fair Value | 456,416 | 968,535
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 11,166 | 14,717
Gross Unrealized Gains | 0 | 365
Gross Unrealized Losses | (1,053) | (1)
Fair Value | 10,113 | 15,081
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 605,033 | 1,008,514
Gross Unrealized Gains | 0 | 457
Gross Unrealized Losses | (103,864) | (20,371)
Fair Value | 501,169 | 988,600
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 211,435 | 216,859
Gross Unrealized Gains | 0 | 812
Gross Unrealized Losses | (25,589) | (3,419)
Fair Value | $ 185,846 | $ 214,252

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