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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 1,777,469 | $ 1,769,134
Gross Unrealized Gains | 588 | 1,603
Gross Unrealized Losses | (166,174) | (152,464)
Fair Value | 1,611,883 | 1,618,273
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 758,367 | 751,219
Gross Unrealized Gains | 5,269 | 7,294
Gross Unrealized Losses | (68,862) | (61,866)
Fair Value | 694,774 | 696,647
Allowance for credit losses | (350) | (785)
Total securities held-to-maturity, net | 758,017 | 750,434
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 316,638 | 316,511
Gross Unrealized Gains | 146 | 303
Gross Unrealized Losses | (20,982) | (20,368)
Fair Value | 295,802 | 296,446
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 500,206 | 500,881
Gross Unrealized Gains | 41 | 57
Gross Unrealized Losses | (77,268) | (68,767)
Fair Value | 422,979 | 432,171
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 583,972 | 575,699
Gross Unrealized Gains | 5,039 | 7,078
Gross Unrealized Losses | (53,410) | (47,461)
Fair Value | 535,601 | 535,316
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 767,508 | 758,283
Gross Unrealized Gains | 393 | 1,181
Gross Unrealized Losses | (63,710) | (59,083)
Fair Value | 704,191 | 700,381
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 51,276 | 52,100
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,779) | (5,424)
Fair Value | 45,497 | 46,676
Corporate debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 184,367 | 184,709
Gross Unrealized Gains | 8 | 62
Gross Unrealized Losses | (3,275) | (3,070)
Fair Value | 181,100 | 181,701
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 8,750 | 8,750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (939) | (1,176)
Fair Value | 7,811 | 7,574
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 123,119 | 123,420
Gross Unrealized Gains | 230 | 216
Gross Unrealized Losses | (9,673) | (8,981)
Fair Value | $ 113,676 | $ 114,655

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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