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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount $ 8,622,988 $ 7,975,022
Fair Values, Assets 9,874 2,869
Less: netting adjustment, Assets [1],[2] (104,880) (57,648)
Fair Values, Liabilities 24,307 44,841
Less: netting adjustment, Liabilities [1],[2] (67,460) (124,204)
Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 204,606 207,828
Total derivative assets/liabilities [1] 99,726 150,180
Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Total derivative assets/liabilities [1] 42,509 55,257
Fair Values, Liabilities [1] 109,969 179,461
Derivatives Designated as Hedging Instruments [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 2,945,150 2,333,150
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 101,921 57,648
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 2,860 18,920
Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 5,677,838 5,641,872
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 102,685 150,180
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 107,109 160,541
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 4,868,800 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] 98,029 145,517
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 97,894 148,778
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 200,699 216,511
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Assets [1] 30 35
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair Values, Liabilities [1] 58 108
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 300,063 310,458
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] 2,075 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] 1,276 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 203,886 206,258
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] 817 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] 1,032 14
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 60,825 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] 1,734 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] 1,592 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] 5,257 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 1,425,000 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] 42,996 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] 2,322  
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]    
Derivatives Fair Value [Line Items]    
Notional or Contractual Amount 1,520,150 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] 58,925 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] $ 538 $ 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.