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Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | $ 4,895,763 | $ 3,348,693
Carrying Amount |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,899,880 | 3,262,727
Loans | 11,718,951 | 11,536,011
Financial Instruments - Liabilities |  |
Time Deposits | 1,072,915 | 1,662,063
Securities Sold Under Agreements to Repurchase | 450,490 | 600,590
Other Debt |  | 50,000
Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,895,763 | 3,348,693
Loans | 11,962,539 | 12,019,151
Financial Instruments - Liabilities |  |
Time Deposits | 1,074,210 | 1,667,774
Securities Sold Under Agreements to Repurchase | 477,228 | 649,039
Other Debt |  | 51,546
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 131,558 | 7,500
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | 0 | 0
Other Debt |  | 0
Significant Other Observable Inputs (Level 2) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,764,205 | 3,341,193
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 1,074,210 | 1,667,774
Securities Sold Under Agreements to Repurchase | 477,228 | 649,039
Other Debt |  | 51,546
Significant Other Unobservable Inputs (Level 3) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 0 | 0
Loans | 11,962,539 | 12,019,151
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | $ 0 | 0
Other Debt |  | $ 0

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- Definition Fair value of time deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element excludes the capital lease obligations. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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