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Investments - Amortized Cost and Estimated Fair Value - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 759,222 | $ 1,041,925
Gross Unrealized Gains | 1,584 | 1,729
Gross Unrealized Losses | (19,017) | (24,453)
Allowance for Credit Losses | 0 | 0
Investment securities available for sale | 741,789 | 1,019,201
U.S. Government Agencies [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 65,579 | 102,823
Gross Unrealized Gains | 7 | 23
Gross Unrealized Losses | (149) | (97)
Investment securities available for sale | 65,437 | 102,749
Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 14,181 | 100,745
Gross Unrealized Gains | 18 | 21
Gross Unrealized Losses | (751) | (1,222)
Investment securities available for sale | 13,448 | 99,544
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 51,060 | 200,057
Gross Unrealized Gains | 81 | 572
Gross Unrealized Losses | (6,466) | (6,423)
Investment securities available for sale | 44,675 | 194,206
Corporate Bond [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 65,303 | 65,273
Gross Unrealized Losses | (10,644) | (13,233)
Investment securities available for sale | 54,659 | 52,040
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 563,099 | 573,027
Gross Unrealized Gains | 1,478 | 1,113
Gross Unrealized Losses | (1,007) | (3,478)
Investment securities available for sale | $ 563,570 | $ 570,662

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss 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 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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