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Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative income reflected in income statement [1] $ 47,167 $ (4,517)
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 [1] $ (5,980) $ (8,460)
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
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 [1] $ 1,674 $ 3,910
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income, Securities, Operating, Taxable Interest Income, Securities, Operating, Taxable
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Securities - Sold [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative income reflected in income statement [1] $ 50,381 $ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Debt and Equity Securities, Gain (Loss) Debt and Equity Securities, Gain (Loss)
Derivatives Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative income reflected in income statement [1] $ 960 $ (271)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] 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 [1] $ 132 $ 304
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income Noninterest Income
[1] Includes the effects of both active derivative instruments and the impact from realization of basis adjustments to hedged assets resulting from previously terminated hedges.