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Fair Value Measurements Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 3,594,076 $ 3,410,899
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average annual constant prepayment rate 8.30%  
Weighted average discount rate 8.60%  
Fair Value, Recurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value $ 3,594,076 3,410,899
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 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 3,594,076 3,410,899
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
AFS, at estimated fair value 0 0
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 246,600 293,100
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 8,500 7,300
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 1,000 1,600
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 1,200 1,700
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 800 800
Other financial liabilities 500 100
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 127,900 159,200
Other financial liabilities $ 177,100 $ 252,800