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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 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 5,997,805 | $ 4,017,971
Interest-bearing deposits with banks | 830,279 | 809,728
Resale agreements | 2,299,184 | 1,460,000
Restricted equity securities, at cost | 76,931 | 83,046
Loans held-for-sale | 1,800 |
Loans held-for-investment, net | 39,485,775 | 37,770,972
Financial liabilities: |  |
FHLB advances | 248,464 | 652,612
Repurchase agreements | 300,000 | 300,000
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 5,997,805 | 4,017,971
Interest-bearing deposits with banks | 830,279 | 809,728
Resale agreements | 2,299,184 | 1,460,000
Restricted equity securities, at cost | 76,931 | 83,046
Loans held-for-sale | 1,819 | 1,788
Loans held-for-investment, net | 39,485,775 | 37,770,972
Mortgage servicing rights | 5,373 | 5,522
Accrued interest receivable | 154,810 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 44,151,817 | 35,862,403
Time deposits | 8,430,758 | 9,000,349
Short-term borrowings |  | 21,009
FHLB advances | 248,464 | 652,612
Repurchase agreements | 300,000 | 300,000
Long-term debt | 147,515 | 147,376
Accrued interest payable | 10,279 | 11,956
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 5,997,805 | 4,017,971
Interest-bearing deposits with banks | 830,279 | 809,728
Resale agreements | 2,290,097 | 1,464,635
Restricted equity securities, at cost | 76,931 | 83,046
Loans held-for-sale | 1,819 | 1,788
Loans held-for-investment, net | 39,414,107 | 37,803,940
Mortgage servicing rights | 8,788 | 8,435
Accrued interest receivable | 154,810 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 44,151,817 | 35,862,403
Time deposits | 8,442,834 | 9,016,884
Short-term borrowings |  | 21,009
FHLB advances | 250,871 | 659,631
Repurchase agreements | 314,315 | 317,850
Long-term debt | 150,232 | 150,131
Accrued interest payable | 10,279 | 11,956
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets: |  |
Cash and cash equivalents | 5,997,805 | 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 | 830,279 | 809,728
Resale agreements | 2,290,097 | 1,464,635
Restricted equity securities, at cost | 76,931 | 83,046
Loans held-for-sale | 1,819 | 1,788
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 154,810 | 150,140
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 44,151,817 | 35,862,403
Time deposits | 8,442,834 | 9,016,884
Short-term borrowings |  | 21,009
FHLB advances | 250,871 | 659,631
Repurchase agreements | 314,315 | 317,850
Long-term debt | 150,232 | 150,131
Accrued interest payable | 10,279 | 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 | 39,414,107 | 37,803,940
Mortgage servicing rights | 8,788 | 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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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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