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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, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 1,135,317 | $ 721,369
Debt Securities, Held-to-maturity, Fair Value | 181,939 | 63,934
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 |  | 121
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 | 1,135,317 | 721,369
Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments |  | 121
Fair Value | 1,135,317 | 721,369
Obligations of U.S. Government-sponsored enterprises |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 10,046 | 98,498
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 | 10,046 | 98,498
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 | 10,046 | 98,498
Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 213,024 | 26,810
Debt Securities, Held-to-maturity, Fair Value | 11,874 | 12,408
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 | 213,024 | 26,810
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 | 213,024 | 26,810
Residential mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 902,021 | 586,136
Debt Securities, Held-to-maturity, Fair Value | 47,021 | 51,526
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 | 902,021 | 586,136
Residential mortgage-backed securities | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 902,021 | 586,136
US Treasury Bill Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 10,226 | 9,925
US Treasury Bill Securities [Member] | Level 3 | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value |  | 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 | 10,226 | 9,925
US Treasury Bill Securities [Member] | Total Fair Value | Recurring basis |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 10,226 | $ 9,925

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