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Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | $ 790 | $ 777
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 1,585,854 | 1,594,967
Equity securities, at fair value | 790 | 777
Recurring | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Equity securities, at fair value | 0 | 0
Recurring | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 1,585,854 | 1,594,967
Equity securities, at fair value | 0 | 0
Recurring | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Equity securities, at fair value | 790 | 777
Recurring | U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 170,814 | 167,251
Recurring | U.S. Treasuries | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Treasuries | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 170,814 | 167,251
Recurring | U.S. Treasuries | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 599,762 | 601,167
Recurring | Obligations of U.S. Government sponsored entities | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. Government sponsored entities | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 599,762 | 601,167
Recurring | Obligations of U.S. Government sponsored entities | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 86,684 | 85,281
Recurring | Obligations of U.S. states and political subdivisions | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. states and political subdivisions | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 86,684 | 85,281
Recurring | Obligations of U.S. states and political subdivisions | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 50,891 | 52,668
Recurring | U.S. Government agencies | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government agencies | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 50,891 | 52,668
Recurring | U.S. Government agencies | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 675,310 | 686,222
Recurring | U.S. Government sponsored entities | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government sponsored entities | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 675,310 | 686,222
Recurring | U.S. Government sponsored entities | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 2,393 | 2,378
Recurring | U.S. corporate debt securities | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. corporate debt securities | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 2,393 | 2,378
Recurring | U.S. corporate debt securities | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | $ 0 | $ 0

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