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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount $ 8,382,935 $ 7,975,022
Fair Values, Assets 4,911 2,869
Less: netting adjustment, Assets [1],[2] (39,988) (57,648)
Fair Values, Liabilities 29,105 44,841
Less: netting adjustment, Liabilities [1],[2] (70,817) (124,204)
Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 138,144 207,828
Total derivative assets/liabilities [1] 98,156 150,180
Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Total derivative assets/liabilities [1] 39,708 55,257
Fair Values, Liabilities [1] 110,525 179,461
Derivatives Designated as Hedging Instruments [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 2,633,150 2,333,150
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 38,360 57,648
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 8,609 18,920
Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 5,749,785 5,641,872
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 99,784 150,180
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 101,916 160,541
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 5,174,836 4,806,258
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 96,176 145,517
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 95,297 148,778
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 218,947 216,511
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 2 35
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 5 108
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 67,476 310,458
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1]   19
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 1,010 3,211
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 108,155 206,258
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 2,038 1,793
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1]   14
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 74,000  
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 318  
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 18  
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 62,806 58,822
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 1,250 2,816
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 1,114 2,785
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 43,565 43,565
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 4,472 5,645
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 1,025,000 1,175,000
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 9,731 50,962
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 867  
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 1,608,150 1,158,150
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 28,629 6,686
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] $ 7,742 $ 18,920
[1] Derivative assets and liabilities are reported at fair value in other assets or 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.