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Fair Value Measurements Narrative (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | $ 3,062,143 | $ 2,497,537
Other real estate owned (OREO) | $ 4,178 | 6,831
Assumed market return to liquidity | 5 years |
Common Class B [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment Owned, Balance, Shares | 133 |
Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assumptions used to estimate fair value, prepayment speed | 19.50% |
Assumptions used to estimate fair value, discount rate | 9.50% |
Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | $ 3,062,143 |
Derivative assets | 339,310 | 145,595
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 |
Derivative assets | 323 | 230
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 2,963,937 |
Derivative assets | 338,987 | 145,365
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 98,206 |
Derivative assets | 0 | 0
Fair Value, Measurements, Recurring | Foreign Exchange Contract | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total liabilities | 280 | 199
Fair Value, Measurements, Recurring | Foreign Exchange Contract | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative assets | 323 | 230
Fair Value, Measurements, Recurring | Forward Commitments | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative assets | 8,000 | 1,200
Total liabilities | 2,300 | 424
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total liabilities | 165,200 | 76,000
Other financial assets | 331,000 | 144,200
Corporate debt securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 367,145 |
Corporate debt securities | Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 367,145 |
Corporate debt securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 |
Corporate debt securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 367,145 |
Corporate debt securities | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 |
Financial Institutions Subordinated Debt | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 362,800 | 362,300
Single-issuer trust preferred securities | Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 | 11,200
Single-issuer trust preferred securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 | 8,800
Single-issuer trust preferred securities | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 0 | 2,400
Other Corporate Debt | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | $ 4,400 | $ 3,900

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