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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

X

- 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Fair value of time deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required.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.

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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.

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- References

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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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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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
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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.

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-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

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