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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 4,533,502 | $ 3,261,149
Interest-bearing deposits with banks | 531,591 | 196,161
Resale agreements | 1,260,000 | 860,000
Restricted equity securities, at cost | 78,963 | 78,580
Loans held-for-investment, net | 36,597,341 | 34,420,252
Financial liabilities: |  |
FHLB advances | 656,759 | 745,915
Repurchase agreements | 300,000 | 200,000
Gross repurchase agreements | 300,000 | 450,000
Carrying amount of repurchase agreements eligible for netting against resale agreements | 0 | 250,000
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 4,533,502 | 3,261,149
Interest-bearing deposits with banks | 531,591 | 196,161
Resale agreements | 1,260,000 | 860,000
Restricted equity securities, at cost | 78,963 | 78,580
Loans held-for-sale | 3,875 | 434
Loans held-for-investment, net | 36,597,341 | 34,420,252
Mortgage servicing rights | 5,363 | 6,068
Accrued interest receivable | 149,595 | 144,599
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 31,410,130 | 27,109,951
Time deposits | 9,262,548 | 10,214,308
Short-term borrowings | 252,851 | 28,669
FHLB advances | 656,759 | 745,915
Repurchase agreements | 300,000 | 200,000
Long-term debt | 1,575,653 | 147,101
Accrued interest payable | 23,007 | 27,246
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 4,533,502 | 3,261,149
Interest-bearing deposits with banks | 531,591 | 196,161
Resale agreements | 1,263,068 | 856,025
Restricted equity securities, at cost | 78,963 | 78,580
Loans held-for-sale | 3,875 | 434
Loans held-for-investment, net | 36,714,052 | 35,021,300
Mortgage servicing rights | 7,798 | 8,199
Accrued interest receivable | 149,595 | 144,599
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 31,410,130 | 27,109,951
Time deposits | 9,295,199 | 10,208,895
Short-term borrowings | 252,851 | 28,669
FHLB advances | 667,996 | 755,371
Repurchase agreements | 320,361 | 232,597
Long-term debt | 1,578,801 | 152,641
Accrued interest payable | 23,007 | 27,246
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets: |  |
Cash and cash equivalents | 4,533,502 | 3,261,149
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 | 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 | 531,591 | 196,161
Resale agreements | 1,263,068 | 856,025
Restricted equity securities, at cost | 78,963 | 78,580
Loans held-for-sale | 3,875 | 434
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 149,595 | 144,599
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 31,410,130 | 27,109,951
Time deposits | 9,295,199 | 10,208,895
Short-term borrowings | 252,851 | 28,669
FHLB advances | 667,996 | 755,371
Repurchase agreements | 320,361 | 232,597
Long-term debt | 1,578,801 | 152,641
Accrued interest payable | 23,007 | 27,246
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 | 36,714,052 | 35,021,300
Mortgage servicing rights | 7,798 | 8,199
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 0 | 0
Time deposits | 0 | 0
Short-term borrowings | 0 | 0
FHLB advances | 0 | 0
Repurchase agreements | 0 | 0
Long-term debt | 0 | 0
Accrued interest payable | $ 0 | $ 0

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