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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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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