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Derivative Instruments and Hedging Activities (Impact of Derivatives on Balance Sheet) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Fair Value of Derivative Assets | $ 372,912,000 | $ 139,962,000
Fair Value of Derivative Liabilities | 179,968,000 | 28,447,000
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,761,038,000 | 7,258,159,000
Fair Value of Derivative Assets | 362,700,000 | 138,672,000
Fair Value of Derivative Liabilities | 176,338,000 | 25,849,000
Derivatives not designated as hedging instruments | Mortgage derivatives | Mortgage derivatives - interest rate lock commitments |  |
Derivative [Line Items] |  |
Notional Amount | 451,953,000 | 70,481,000
Fair Value of Derivative Assets | 10,212,000 | 1,290,000
Fair Value of Derivative Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Mortgage derivatives | Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans |  |
Derivative [Line Items] |  |
Notional Amount | 492,500,000 | 107,000,000
Fair Value of Derivative Assets | 0 | 0
Fair Value of Derivative Liabilities | 1,793,000 | 168,000
Derivatives not designated as hedging instruments | Other contracts |  |
Derivative [Line Items] |  |
Notional Amount | 186,074,000 | 145,764,000
Fair Value of Derivative Assets | 0 | 0
Fair Value of Derivative Liabilities | 377,000 | 91,000
Derivatives not designated as hedging instruments | Visa derivative |  |
Derivative [Line Items] |  |
Fair Value of Derivative Assets | 0 | 0
Fair Value of Derivative Liabilities | 1,460,000 | 2,339,000
Derivatives not designated as hedging instruments | Risk derivative |  |
Derivative [Line Items] |  |
Notional Amount | 2,700,000 | 3,000,000.0
Cash flow hedges |  |
Derivative [Line Items] |  |
Fair Value of Derivative Assets | 90,116,000 | 54,000
Fair Value of Derivative Liabilities | 0 | 8,624,000
Cash flow hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 2,750,000,000 | 2,000,000,000
Fair Value of Derivative Assets | 90,116,000 | 54,000
Fair Value of Derivative Liabilities | $ 0 | $ 8,624,000

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