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Fair Value Measurements Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value $ 3,187,390 $ 3,062,143
Assumed market return to liquidity 5 years  
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assumptions used to estimate fair value, prepayment speed 14.60%  
Assumptions used to estimate fair value, discount rate 9.00%  
Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value $ 3,187,390 3,062,143
Derivative assets 161,243 339,310
Fair Value, Measurements, Recurring | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 2,985,105 2,963,937
Derivative assets 160,945 338,987
Fair Value, Measurements, Recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 74,667 98,206
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 127,618 0
Derivative assets 298 323
Fair Value, Measurements, Recurring | Foreign Exchange Contract | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total liabilities 300  
Fair Value, Measurements, Recurring | Foreign Exchange Contract | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 298 323
Fair Value, Measurements, Recurring | Forward Commitments | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2,400 8,000
Total liabilities 0 2,300
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other financial assets 158,600 331,000
Total liabilities 86,100 165,200
Corporate debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 386,133 367,145
Corporate debt securities | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 386,133 367,145
Corporate debt securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 386,133 367,145
Corporate debt securities | Fair Value, Measurements, Recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 0 0
Corporate debt securities | Fair Value, Measurements, Recurring | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 0 0
Financial Institutions Subordinated Debt | Fair Value, Measurements, Recurring | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 383,400 362,800
Other Corporate Debt | Fair Value, Measurements, Recurring | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value $ 2,800 $ 4,400