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Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Held-to-maturity |  |  |  |
Beginning balance | $ 1,888 | $ 1,377 | $ 1,388 | $ 1,279
Provision for credit loss expense | 1,326 | 0 | 1,826 | 0
Net increase (decrease) in allowance on previously impaired securities | 1,326 | 0 | 1,326 | 0
Recoveries |  | 4 |  | 102
Ending balance | 3,214 | 1,381 | 3,214 | 1,381
Securities charged-off | 0 |  | (7,000) |
State and political subdivisions |  |  |  |
Held-to-maturity |  |  |  |
Beginning balance | 362 | 1,285 | 110 | 1,197
Provision for credit loss expense | 572 | 0 | 824 | 0
Net increase (decrease) in allowance on previously impaired securities | 0 | (1,183) | 0 | (1,183)
Recoveries |  | 1 |  | 89
Ending balance | 934 | 103 | 934 | 103
Securities charged-off | 0 |  | 0 |
Other securities |  |  |  |
Held-to-maturity |  |  |  |
Beginning balance | 1,526 | 92 | 1,278 | 82
Provision for credit loss expense | 754 | 0 | 1,002 | 0
Net increase (decrease) in allowance on previously impaired securities | 1,326 | 1,183 | 1,326 | 1,183
Recoveries |  | 3 |  | 13
Ending balance | 2,280 | $ 1,278 | 2,280 | $ 1,278
Securities charged-off | $ 0 |  | $ (7,000) |

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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 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 allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition Amount of increase in allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity), from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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