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Investment Securities - Allowance for Credit Losses AFS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Available-for-sale |  |  |  |
Beginning balance | $ 5,800 |  | $ 0 |
Provision for credit loss expense | 0 |  | 12,800 |
Reduction due to sales | (2,078) |  | (2,078) |
Net increase (decrease) in allowance on previously impaired securities | 1,326 | $ 0 | 1,326 | $ 0
Securities charged-off | 0 |  | (7,000) |
Ending balance | 2,396 |  | 2,396 |
State and political subdivisions |  |  |  |
Available-for-sale |  |  |  |
Beginning balance | 0 |  | 0 |
Provision for credit loss expense | 0 |  | 0 |
Reduction due to sales | 0 |  | 0 |
Net increase (decrease) in allowance on previously impaired securities | 0 | (1,183) | 0 | (1,183)
Securities charged-off | 0 |  | 0 |
Ending balance | 0 |  | 0 |
Other securities |  |  |  |
Available-for-sale |  |  |  |
Beginning balance | 5,800 |  | 0 |
Provision for credit loss expense | 0 |  | 12,800 |
Reduction due to sales | (2,078) |  | (2,078) |
Net increase (decrease) in allowance on previously impaired securities | 1,326 | $ 1,183 | 1,326 | $ 1,183
Securities charged-off | 0 |  | (7,000) |
Ending balance | $ 2,396 |  | $ 2,396 |

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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in 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) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + 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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- Definition Amount, excluding accrued interest, of decrease in 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) from writeoff. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, of reversal of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) transferred out of available-for-sale into investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 8B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-8B + Details
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