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Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 912,429 | $ 1,135,317
Debt Securities, Held-to-maturity, Fair Value | 501,523 | 181,939
Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments |  | 0
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments |  | 0
Fair Value | 0 | 0
Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments |  | 0
Fair Value | 912,429 | 1,135,317
Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments |  | 0
Fair Value | 912,429 | 1,135,317
Obligations of U.S. Government-sponsored enterprises |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 15,161 | 10,046
Obligations of U.S. Government-sponsored enterprises | Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Obligations of U.S. Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Obligations of U.S. Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 15,161 | 10,046
Obligations of U.S. Government-sponsored enterprises | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 15,161 | 10,046
Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 344,232 | 213,024
Debt Securities, Held-to-maturity, Fair Value | 251,138 | 11,874
Obligations of states and political subdivisions | Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 344,232 | 213,024
Obligations of states and political subdivisions | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 344,232 | 213,024
Residential mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 526,572 | 902,021
Debt Securities, Held-to-maturity, Fair Value | 114,541 | 47,021
Residential mortgage-backed securities | Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 526,572 | 902,021
Residential mortgage-backed securities | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 526,572 | 902,021
US Treasury Bill Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 11,466 | 10,226
US Treasury Bill Securities [Member] | Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
US Treasury Bill Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 0 | 0
US Treasury Bill Securities [Member] | Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 11,466 | 10,226
US Treasury Bill Securities [Member] | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 11,466 | $ 10,226

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