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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount $ 8,315,062,000 $ 8,040,346,000  
Fair Values, Assets 44,299,000 46,120,000  
Fair Values, Assets [1] 98,257,000 105,612,000  
Less: netting adjustment [1],[2] (42,574,000) (42,486,000)  
Total derivative assets/liabilities [1] 55,683,000 63,126,000  
Fair Values, Liabilities 31,619,000 36,259,000  
Fair Values, Liabilities [1] 91,143,000 95,373,000  
Less: netting adjustment [1],[2]   (6,000)  
Other Liabilities [Member]      
Derivatives Fair Value [Line Items]      
Total derivative assets/liabilities [1] 91,143,000 95,367,000  
Derivatives Designated as Hedging Instruments [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 2,159,000,000 2,172,500,000  
Fair Values, Assets [1] 25,302,000 27,595,000  
Fair Values, Liabilities [1] 17,922,000 16,335,000  
Derivatives Not Designated as Hedging Instruments [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 6,156,062,000 5,867,846,000  
Fair Values, Assets [1] 72,955,000 78,017,000  
Fair Values, Liabilities [1] 73,221,000 79,038,000  
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 5,492,800,000 5,308,711,000  
Fair Values, Assets [1] 69,195,000 73,725,000  
Fair Values, Liabilities [1] 69,323,000 73,829,000  
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 431,843,000 373,117,000  
Fair Values, Assets [1] 22,000 10,000  
Fair Values, Liabilities [1] 26,000 10,000  
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 48,849,000 23,192,000  
Fair Values, Assets [1] 714,000 497,000  
Fair Values, Liabilities [1] 23,000    
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 19,418,000 9,081,000  
Fair Values, Assets [1] 46,000 2,000  
Fair Values, Liabilities [1] 161,000 108,000  
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 38,750,000 30,000,000  
Fair Values, Assets [1] 372,000 4,000  
Fair Values, Liabilities [1] 28,000 62,000  
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 82,858,000 82,157,000  
Fair Values, Assets [1] 2,606,000 3,779,000  
Fair Values, Liabilities [1] 2,578,000 3,745,000  
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 41,544,000 41,588,000  
Fair Values, Liabilities [1] 1,082,000 1,284,000  
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 1,800,000,000 1,775,000,000  
Fair Values, Assets [1] 1,985,000 4,026,000  
Fair Values, Liabilities [1] 17,922,000 16,335,000  
Fair Value Hedging [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 265,000,000   $ 125,000,000
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]      
Derivatives Fair Value [Line Items]      
Notional or Contractual Amount 359,000,000 397,500,000  
Fair Values, Assets [1] $ 23,317,000 $ 23,569,000  
[1] Derivative assets and liabilities are reported in other assets and other liabilities, respectively, in the consolidated balance sheets.
[2] Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.