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Investment Securities - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) security | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($)
Investment securities total | $ 1,000,000 | $ 1,000,000 | $ 1,200,000 |
Securities with no stated contractual date, amortized cost | 700 | 700 |  |
Available-for-sale Securities | 527,547 | 527,547 | 628,829 |
Held-to-maturity securities | 533,108 | 533,108 | 585,052 |
Purchases of available-for-sale securities |  | 185,713 | 0 | $ 259,846
Loss on security sales | $ 6,600 | (6,582) |  |
Maturities and paydowns of available-for-sale securities |  | 157,538 | $ 92,032 | 141,892
Sales of available-for-sale securities |  | $ 132,113 |  | 128,430
Number of securities | security | 180 | 180 | 230 |
Gain/(loss) on recovery of securities with previously incurred OTTI | $ 6,600 | $ (6,582) |  |
Purchases of held-to-maturity securities |  | 10,483 | $ 2,452 | 101,699
Maturities and paydowns of held-to-maturity securities |  | $ 63,078 | $ 69,555 | $ 133,363
Number of held-to-maturity securities in unrealized loss positions | security | 160 | 160 | 123 |
Held-to-maturity investment securities pledged as collateral | $ 500,500 | $ 500,500 | $ 559,300 |
Held-to-maturity investment securities held as collateral | 0 | 0 | $ 0 |
Accrued interest receivable from available-for-sale investment securities | $ 1,300 | $ 1,300 |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Financing Receivable, Allowance for Credit Losses | Financing Receivable, Allowance for Credit Losses | Financing Receivable, Allowance for Credit Losses |
Accrued interest receivable from held-to-maturity investment securities | $ 900 | $ 900 | $ 1,000 |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Financing Receivable, Allowance for Credit Losses | Financing Receivable, Allowance for Credit Losses | Financing Receivable, Allowance for Credit Losses |
Other securities investments with no contractual maturity |  |  |  |
Securities with no stated contractual date, fair value | $ 800 | $ 800 |  |
Asset Pledged as Collateral |  |  |  |
Available-for-sale Securities | 0 | 0 | $ 0 |
Asset Pledged as Collateral | Federal Funds Purchased |  |  |  |
Available-for-sale Securities | $ 238,600 | $ 238,600 | $ 312,400 |

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- Definition Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), without single maturity date and not allocated over maturity grouping. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), without single maturity date and not allocated over maturity grouping. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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