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Financial Instruments - Amortized Cost and Fair Value of Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | $ 3,003,320 | $ 3,072,639
U.S. government-sponsored enterprises |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 273,656 | 284,790
U.S. government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 1,298,558 | 1,324,684
Private mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 171,337 | 171,394
Non-government-sponsored asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 200,431 | 225,648
State and political subdivisions |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 860,054 | 870,361
Other securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 199,284 | 195,762
Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,003,320 | 3,072,639
Fair Value, Recurring | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 2,981,788 | 3,051,110
Fair Value, Recurring | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 21,532 | 21,529
Fair Value, Recurring | U.S. government-sponsored enterprises |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 273,656 | 284,790
Fair Value, Recurring | U.S. government-sponsored enterprises | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | U.S. government-sponsored enterprises | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 273,656 | 284,790
Fair Value, Recurring | U.S. government-sponsored enterprises | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | U.S. government-sponsored mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 1,298,558 | 1,324,684
Fair Value, Recurring | U.S. government-sponsored mortgage-backed securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | U.S. government-sponsored mortgage-backed securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 1,298,558 | 1,324,684
Fair Value, Recurring | U.S. government-sponsored mortgage-backed securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Private mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 171,337 | 171,394
Fair Value, Recurring | Private mortgage-backed securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Private mortgage-backed securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 171,337 | 171,394
Fair Value, Recurring | Private mortgage-backed securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Non-government-sponsored asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 200,431 | 225,648
Fair Value, Recurring | Non-government-sponsored asset backed securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Non-government-sponsored asset backed securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 200,431 | 225,648
Fair Value, Recurring | Non-government-sponsored asset backed securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | State and political subdivisions |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 860,054 | 870,361
Fair Value, Recurring | State and political subdivisions | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | State and political subdivisions | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 843,390 | 853,699
Fair Value, Recurring | State and political subdivisions | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 16,664 | 16,662
Fair Value, Recurring | Other securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 199,284 | 195,762
Fair Value, Recurring | Other securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Other securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 194,416 | 190,895
Fair Value, Recurring | Other securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | $ 4,868 | $ 4,867

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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