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Securities Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2022 | Mar. 31, 2020 | Sep. 30, 2018 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  |  | $ 1,100,000 | $ 873,600 | $ 179,800 |  |  |
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio |  |  | $ 1,500 | $ 69,000 | $ (2,200) |  |  |
Secured borrowing under agreement to repurchase | $ 325,600 |  |  |  |  | $ 325,600 |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 206,560 |  |  |  |  | 206,560 |  | $ 221,614
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,550,516 |  |  |  |  | 4,550,516 |  | $ 4,343,563
Sales | 0 | $ 0 |  |  |  | 188,486 | $ 822,741 |
Debt Securities, Available-for-Sale, Realized Gain | 0 | 0 |  |  |  | 42 | 86 |
Debt Securities, Available-for-sale, Realized Loss | 0 | $ 0 |  |  |  | 12,600 | $ 72,200 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |  |  |  | 0 |  |
Securities pledged as collateral |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 3,800,000 |  |  |  |  | 3,800,000 |  |
Securities pledged as collateral |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Secured borrowing under agreement to repurchase | $ 325,600 |  |  |  |  | $ 325,600 |  |

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- Definition The amount of available-for-sale securities transferred to the held-to-maturity portfolio during the period, a non-cash item. + References No definition available. + Details
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- Definition Amount 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 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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