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Fair Value Measurement and Fair Value of Financial Instruments - Carrying and Fair Value Estimates per the Fair Value Hierarchy of Financial Instruments Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 4,561,178 | $ 3,481,784
Interest-bearing deposits with banks | 17,213 | 139,021
Resale agreements | 785,000 | 792,192
HTM debt securities | 2,964,235 | 3,001,868
Restricted equity securities, at cost | 79,522 | 78,624
Financial liabilities: |  |
Repurchase agreements | 0 | 300,000
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 4,561,178 | 3,481,784
Interest-bearing deposits with banks | 17,213 | 139,021
Resale agreements | 785,000 | 792,192
HTM debt securities | 2,964,235 | 3,001,868
Restricted equity securities, at cost | 79,522 | 78,624
Loans held-for-sale | 4,762 | 25,644
Loans held-for-investment, net | 50,251,661 | 47,606,785
Mortgage servicing rights | 5,208 | 6,235
Accrued interest receivable | 317,881 | 263,430
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 38,435,954 | 42,637,316
Time deposits | 16,651,077 | 13,330,533
Repurchase agreements |  | 300,000
Short-term borrowings | 4,500,000 |
Long-term debt | 148,173 | 147,950
Accrued interest payable | 150,890 | 37,198
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 4,561,178 | 3,481,784
Interest-bearing deposits with banks | 17,213 | 139,021
Resale agreements | 672,250 | 693,656
HTM debt securities | 2,308,048 | 2,455,171
Restricted equity securities, at cost | 79,522 | 78,624
Loans held-for-sale | 4,762 | 25,644
Loans held-for-investment, net | 48,992,846 | 46,670,690
Mortgage servicing rights | 9,821 | 10,917
Accrued interest receivable | 317,881 | 263,430
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 38,435,954 | 42,637,316
Time deposits | 16,547,883 | 13,228,777
Repurchase agreements |  | 304,097
Short-term borrowings | 4,500,000 |
Long-term debt | 144,214 | 143,483
Accrued interest payable | 150,890 | 37,198
Estimated Fair Value | Level 1 |  |
Financial assets: |  |
Cash and cash equivalents | 4,561,178 | 3,481,784
Interest-bearing deposits with banks | 0 | 0
Resale agreements | 0 | 0
HTM debt securities | 470,618 | 471,469
Restricted equity securities, at cost | 0 | 0
Loans held-for-sale | 0 | 0
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 0 | 0
Time deposits | 0 | 0
Repurchase agreements |  | 0
Short-term borrowings | 0 |
Long-term debt | 0 | 0
Accrued interest payable | 0 | 0
Estimated Fair Value | Level 2 |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits with banks | 17,213 | 139,021
Resale agreements | 672,250 | 693,656
HTM debt securities | 1,837,430 | 1,983,702
Restricted equity securities, at cost | 79,522 | 78,624
Loans held-for-sale | 4,762 | 25,644
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 317,881 | 263,430
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 38,435,954 | 42,637,316
Time deposits | 16,547,883 | 13,228,777
Repurchase agreements |  | 304,097
Short-term borrowings | 4,500,000 |
Long-term debt | 144,214 | 143,483
Accrued interest payable | 150,890 | 37,198
Estimated Fair Value | Level 3 |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits with banks | 0 | 0
Resale agreements | 0 | 0
HTM debt securities | 0 | 0
Restricted equity securities, at cost | 0 | 0
Loans held-for-sale | 0 | 0
Loans held-for-investment, net | 48,992,846 | 46,670,690
Mortgage servicing rights | 9,821 | 10,917
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 0 | 0
Time deposits | 0 | 0
Repurchase agreements |  | 0
Short-term borrowings | 0 |
Long-term debt | 0 | 0
Accrued interest payable | $ 0 | $ 0

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