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Fair Value Measurements Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 2,758,597 $ 3,062,143
Significant input, assumed market return to liquidity (years) 5 years  
Other real estate owned (OREO) $ 3,664 4,178
Visa    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Gain on sale of shares $ 34,000  
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 15.30%  
Weighted average discount rate 9.50%  
Fair Value, Recurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 2,758,597  
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 2,682,393  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 76,204  
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 355,000 362,800
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  
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 272 280
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned (OREO) 3,664 4,178
Net MSRs at end of period 33,403 28,245
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 323 323
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 6,800 8,000
Other financial liabilities 316 2,300
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 190,000 331,000
Other financial liabilities $ 108,600 $ 165,200