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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 1,722,117 | $ 1,729,054
Gross Unrealized Gains | 8 | 481
Gross Unrealized Losses | (235,021) | (193,728)
Fair Value | 1,487,104 | 1,535,807
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 731,440 | 710,650
Gross Unrealized Gains | 270 | 2,484
Gross Unrealized Losses | (109,050) | (84,617)
Fair Value | 622,660 | 628,517
Allowance for credit losses | (785) | (735)
Total securities held-to-maturity, net | 730,655 | 709,915
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 308,181 | 266,090
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (28,724) | (28,305)
Fair Value | 279,457 | 237,785
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 501,515 | 507,842
Gross Unrealized Gains | 8 | 27
Gross Unrealized Losses | (114,089) | (90,425)
Fair Value | 387,434 | 417,444
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 554,459 | 529,012
Gross Unrealized Gains | 68 | 2,321
Gross Unrealized Losses | (87,975) | (65,347)
Fair Value | 466,552 | 465,986
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 713,896 | 727,931
Gross Unrealized Gains | 0 | 453
Gross Unrealized Losses | (85,926) | (68,980)
Fair Value | 627,970 | 659,404
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 53,259 | 57,018
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,477) | (6,416)
Fair Value | 45,782 | 50,602
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 189,775 | 213,441
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (4,984) | (4,908)
Fair Value | 184,791 | 208,534
Corporate debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 8,750 | 13,750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,298) | (1,110)
Fair Value | 7,452 | 12,640
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 123,722 | 124,620
Gross Unrealized Gains | 202 | 163
Gross Unrealized Losses | (13,598) | (12,854)
Fair Value | $ 110,326 | $ 111,929

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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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