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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | $ 83,120 |  | $ 66,449
Securities held-to-maturity |  | 2,432,068 |  | 2,560,252
Quoted market prices in an active market (Level 1) |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 0 |  | 0
Securities held-to-maturity |  | 0 |  | 0
Loans, net |  | 0 |  | 0
Consumer loans held-for-sale |  | 0 |  | 0
Commercial loans held-for-sale |  | 0 |  | 0
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 0 |  | 0
Federal Home Loan Bank advances |  | 0 |  | 0
Subordinated debt and other borrowings |  | 0 |  | 0
Models with significant observable market parameters (Level 2) |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 0 |  | 0
Securities held-to-maturity |  | 2,432,068 |  | 2,560,252
Loans, net |  | 0 |  | 0
Consumer loans held-for-sale |  | 163,509 |  | 175,838
Commercial loans held-for-sale |  | 12,296 |  | 19,724
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 0 |  | 0
Federal Home Loan Bank advances |  | 0 |  | 0
Subordinated debt and other borrowings |  | 0 |  | 0
Models with significant unobservable market parameters (Level 3) |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 83,121 |  | 66,451
Securities held-to-maturity |  | 0 |  | 0
Loans, net |  | 37,082,950 |  | 34,440,683
Consumer loans held-for-sale |  | 0 |  | 0
Commercial loans held-for-sale |  | 0 |  | 0
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 45,108,617 |  | 42,190,235
Federal Home Loan Bank advances |  | 1,802,117 |  | 1,874,588
Subordinated debt and other borrowings |  | 429,775 |  | 431,996
Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 83,120 |  | 66,449
Securities held-to-maturity |  | 2,644,802 |  | 2,798,899
Loans, net |  | 37,498,163 |  | 35,071,282
Consumer loans held-for-sale |  | 163,129 |  | 175,627
Commercial loans held-for-sale |  | 12,267 |  | 19,700
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 46,052,697 |  | 43,073,236
Federal Home Loan Bank advances |  | 1,777,003 |  | 1,874,134
Subordinated debt and other borrowings |  | 426,483 |  | 425,821
Estimated Fair Value |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 83,121 | [1] | 66,451
Securities held-to-maturity | [1] | 2,432,068 |  | 2,560,252
Loans, net | [1] | 37,082,950 |  | 34,440,683
Consumer loans held-for-sale | [1] | 163,509 |  | 175,838
Commercial loans held-for-sale | [1] | 12,296 |  | 19,724
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase | [1] | 45,108,617 |  | 42,190,235
Federal Home Loan Bank advances | [1] | 1,802,117 |  | 1,874,588
Subordinated debt and other borrowings | [1] | $ 429,775 |  | $ 431,996
[1] | Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-20 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-10 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481444/860-30-45-2A Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)(A)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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