v3.26.1
Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ (3,367) $ (1,520) $ 43,800 $ (6,037)
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 $ (5,664) $ (8,735) $ (11,644) $ (17,195)
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 [1] $ 1,386 $ 4,690 $ 3,060 $ 8,600
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 Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Securities - Sold [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative income reflected in income statement $ 0 $ 0 $ 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) 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 $ 395 $ 1,969 $ 1,355 $ 1,698
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 $ 516 $ 556 $ 648 $ 860
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income Noninterest Income 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.