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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, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 3,042,281 | $ 3,001,377
Interest-bearing deposits with banks | 160,423 | 371,000
Resale agreements | 860,000 | 1,035,000
Restricted equity securities, at cost | 78,334 | 74,069
Loans held-for-sale | 294 | 275
Loans held-for-investment, net | 33,679,400 | 32,073,867
Financial liabilities: |  |
Short-term borrowings | 47,689 | 57,638
FHLB advances | 745,494 | 326,172
Repurchase agreements | 50,000 | 50,000
Long-term debt |  | 146,835
Carrying amount of repurchase agreements eligible for netting against resale agreements | 400,000 | 400,000
Gross repurchase agreements | 450,000 | 450,000
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 3,042,281 | 3,001,377
Interest-bearing deposits with banks | 160,423 | 371,000
Resale agreements | 860,000 | 1,035,000
Restricted equity securities, at cost | 78,334 | 74,069
Loans held-for-sale | 294 | 275
Loans held-for-investment, net | 33,679,400 | 32,073,867
Mortgage servicing rights | 6,380 | 7,836
Accrued interest receivable | 143,804 | 146,262
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 26,139,319 | 26,370,562
Time deposits | 10,520,207 | 9,069,066
Short-term borrowings | 47,689 | 57,638
FHLB advances | 745,494 | 326,172
Repurchase agreements | 50,000 | 50,000
Long-term debt | 147,033 | 146,835
Accrued interest payable | 24,573 | 22,893
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 3,042,281 | 3,001,377
Interest-bearing deposits with banks | 160,423 | 371,000
Resale agreements | 857,935 | 1,016,724
Restricted equity securities, at cost | 78,334 | 74,069
Loans held-for-sale | 294 | 275
Loans held-for-investment, net | 33,998,189 | 32,273,157
Mortgage servicing rights | 8,412 | 11,427
Accrued interest receivable | 143,804 | 146,262
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 26,139,319 | 26,370,562
Time deposits | 10,519,103 | 9,084,597
Short-term borrowings | 47,689 | 57,638
FHLB advances | 754,902 | 334,793
Repurchase agreements | 85,028 | 87,668
Long-term debt | 145,923 | 152,556
Accrued interest payable | 24,573 | 22,893
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets: |  |
Cash and cash equivalents | 3,042,281 | 3,001,377
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 | 160,423 | 371,000
Resale agreements | 857,935 | 1,016,724
Restricted equity securities, at cost | 78,334 | 74,069
Loans held-for-sale | 294 | 275
Loans held-for-investment, net | 0 | 0
Mortgage servicing rights | 0 | 0
Accrued interest receivable | 143,804 | 146,262
Financial liabilities: |  |
Demand, checking, savings and money market deposits | 26,139,319 | 26,370,562
Time deposits | 10,519,103 | 9,084,597
Short-term borrowings | 47,689 | 57,638
FHLB advances | 754,902 | 334,793
Repurchase agreements | 85,028 | 87,668
Long-term debt | 145,923 | 152,556
Accrued interest payable | 24,573 | 22,893
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 | 33,998,189 | 32,273,157
Mortgage servicing rights | 8,412 | 11,427
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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