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Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ (2,751) $ (8,881) $ (8,788) $ (31,440)
Fair Value Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement     203,500  
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Interest Rate Swaps - Variable Rate Loans [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ (8,979) $ (12,649) $ (26,174) $ (38,120)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and Fee Income, Loan and Lease, Held-in-Portfolio Interest and Fee Income, Loan and Lease, Held-in-Portfolio Interest and Fee Income, Loan and Lease, Held-in-Portfolio Interest and Fee Income, Loan and Lease, Held-in-Portfolio
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Interest Rate Swaps - Securities [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ 4,798 $ 3,215 $ 13,398 $ 9,437
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income, Securities, Operating, Taxable Interest Income, Securities, Operating, Taxable Interest Income, Securities, Operating, Taxable Interest Income, Securities, Operating, Taxable
Derivatives Not Designated as Hedging Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ 1,932 $ 923 $ 3,630 $ (2,939)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other Noninterest Income, Other Noninterest Income, Other Noninterest Income, Other
Derivatives Not Designated as Hedging Instruments [Member] | Residential mortgage banking        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ (502) $ (370) $ 358 $ 182
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income Noninterest Income Noninterest Income Noninterest Income