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Fair Value Measurements Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
AFS, at estimated fair value   $ 3,084,337 $ 3,062,143
Significant input, assumed market return to liquidity (years)   5 years  
Other real estate owned (OREO)   $ 1,896 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   15.90%  
Weighted average discount rate   9.00%  
Fair Value, Recurring [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
AFS, at estimated fair value   $ 3,084,337 3,062,143
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
AFS, at estimated fair value   153,210 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   2,855,994 2,963,937
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
AFS, at estimated fair value   75,133 98,206
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   366,600 362,800
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   2,800 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   300 300
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other real estate owned (OREO)   1,896 4,178
Net MSRs at end of period   32,938 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   300 300
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   3,600 8,000
Other financial liabilities   18 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   186,900 331,000
Other financial liabilities   $ 97,000 $ 165,200