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Fair Value Measurements Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 2,793,480 $ 2,497,537
Significant input, assumed market return to liquidity (years) 5 years  
Other real estate owned (OREO) $ 4,565 6,831
Common Class B [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, balance (in shares) 133  
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average annual constant prepayment rate 17.70%  
Weighted average discount rate 9.50%  
Fair Value, Recurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 2,793,480  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 2,695,490  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 97,990  
Fair Value, Recurring [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 338,200 362,300
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 0 11,200
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 0 8,800
Fair Value, Recurring [Member] | Single-issuer Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 0 2,400
Fair Value, Recurring [Member] | Other Corporate Debt [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 4,400 3,900
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other financial liabilities 299 199
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned (OREO) 4,565 6,831
Net MSRs at end of period 29,682 45,193
Foreign Exchange Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other financial assets 372 230
Forward Commitments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other financial assets 12,000 1,200
Other financial liabilities 1,700 424
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other financial assets 375,600 144,200
Other financial liabilities $ 183,200 $ 76,000