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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 4,852,901 | $ 4,017,971
Interest-bearing deposits with banks | 855,162 | 809,728
Resale agreements | 2,596,142 | 1,460,000
Restricted equity securities, at cost | 77,200 | 83,046
Loans held-for-sale | 0 |
Loans held-for-investment, net | 39,921,301 | 37,770,972
Financial liabilities: |  |
FHLB advances | 248,898 | 652,612
Repurchase agreements | 300,000 | 300,000
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 4,852,901 | 4,017,971
Interest-bearing deposits with banks | 855,162 | 809,728
Resale agreements | 2,596,142 | 1,460,000
Restricted equity securities, at cost | 77,200 | 83,046
Loans held-for-sale | 0 | 1,788
Loans held-for-investment, net | 39,921,301 | 37,770,972
Mortgage servicing rights | 5,620 | 5,522
Accrued interest receivable | 151,826 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 45,117,548 | 35,862,403
Time deposits | 8,238,642 | 9,000,349
Short-term borrowings |  | 21,009
FHLB advances | 248,898 | 652,612
Repurchase agreements | 300,000 | 300,000
Long-term debt | 147,586 | 147,376
Accrued interest payable | 11,275 | 11,956
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 4,852,901 | 4,017,971
Interest-bearing deposits with banks | 855,162 | 809,728
Resale agreements | 2,580,845 | 1,464,635
Restricted equity securities, at cost | 77,200 | 83,046
Loans held-for-sale | 0 | 1,788
Loans held-for-investment, net | 39,953,031 | 37,803,940
Mortgage servicing rights | 8,858 | 8,435
Accrued interest receivable | 151,826 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 45,117,548 | 35,862,403
Time deposits | 8,248,717 | 9,016,884
Short-term borrowings |  | 21,009
FHLB advances | 250,635 | 659,631
Repurchase agreements | 312,264 | 317,850
Long-term debt | 149,625 | 150,131
Accrued interest payable | 11,275 | 11,956
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets: |  |
Cash and cash equivalents | 4,852,901 | 4,017,971
Interest-bearing deposits with banks | 0 | 0
Resale agreements | 0 | 0
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
Short-term borrowings |  | 0
FHLB advances | 0 | 0
Repurchase agreements | 0 | 0
Long-term debt | 0 | 0
Accrued interest payable | 0 | 0
Estimated Fair Value | Significant Other Observable Inputs (Level 2) |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits with banks | 855,162 | 809,728
Resale agreements | 2,580,845 | 1,464,635
Restricted equity securities, at cost | 77,200 | 83,046
Loans held-for-sale | 0 | 1,788
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 151,826 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 45,117,548 | 35,862,403
Time deposits | 8,248,717 | 9,016,884
Short-term borrowings |  | 21,009
FHLB advances | 250,635 | 659,631
Repurchase agreements | 312,264 | 317,850
Long-term debt | 149,625 | 150,131
Accrued interest payable | 11,275 | 11,956
Estimated Fair Value | Significant Unobservable Inputs (Level 3) |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits with banks | 0 | 0
Resale agreements | 0 | 0
Restricted equity securities, at cost | 0 | 0
Loans held-for-sale | 0 | 0
Loans held-for-investment, net | 39,953,031 | 37,803,940
Mortgage servicing rights | 8,858 | 8,435
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 0 | 0
Time deposits | 0 | 0
Short-term borrowings |  | 0
FHLB advances | 0 | 0
Repurchase agreements | 0 | 0
Long-term debt | 0 | 0
Accrued interest payable | $ 0 | $ 0

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