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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | $ 554,022 |  | $ 558,009
Securities held-to-maturity |  | 2,733,059 |  | 2,775,184
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 |  | 2,733,059 |  | 2,775,184
Loans, net |  | 0 |  | 0
Consumer loans held-for-sale |  | 105,060 |  | 104,626
Commercial loans held-for-sale |  | 6,096 |  | 9,316
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 |  | 459,206 |  | 461,375
Securities held-to-maturity |  | 0 |  | 0
Loans, net |  | 32,086,768 |  | 31,863,583
Consumer loans held-for-sale |  | 0 |  | 0
Commercial loans held-for-sale |  | 0 |  | 0
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 38,791,572 |  | 37,954,938
Federal Home Loan Bank advances |  | 2,104,237 |  | 2,166,912
Subordinated debt and other borrowings |  | 462,835 |  | 462,399
Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 554,022 |  | 558,009
Securities held-to-maturity |  | 2,993,129 |  | 3,006,357
Loans, net |  | 32,791,536 |  | 32,323,036
Consumer loans held-for-sale |  | 104,586 |  | 104,217
Commercial loans held-for-sale |  | 6,068 |  | 9,280
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase |  | 39,603,443 |  | 38,749,299
Federal Home Loan Bank advances |  | 2,116,417 |  | 2,138,169
Subordinated debt and other borrowings |  | 425,159 |  | 424,938
Estimated Fair Value |  |  |  |
Financial assets: |  |  |  |
Securities purchased with agreement to resell |  | 459,206 | [1] | 461,375
Securities held-to-maturity | [1] | 2,733,059 |  | 2,775,184
Loans, net | [1] | 32,086,768 |  | 31,863,583
Consumer loans held-for-sale | [1] | 105,060 |  | 104,626
Commercial loans held-for-sale | [1] | 6,096 |  | 9,316
Financial liabilities: |  |  |  |
Deposits and securities sold under agreements to repurchase | [1] | 38,791,572 |  | 37,954,938
Federal Home Loan Bank advances | [1] | 2,104,237 |  | 2,166,912
Subordinated debt and other borrowings | [1] | $ 462,835 |  | $ 462,399
[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 Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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