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Derivative Instruments and Hedging Activities (Impact of Derivatives on Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Designated as hedging instruments
Derivative [Line Items]
Estimated fair value of derivative assets	$ 546	$ 22,004
Estimated fair value of derivative liabilities	187,520	20,395
Derivatives not designated as hedging instruments
Derivative [Line Items]
Estimated fair value of derivative assets	190,831	169,704
Estimated fair value of derivative liabilities	157,195	78,207
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Notional Amount	9,250,136	9,653,600
Estimated fair value of derivative assets	188,994	167,560
Estimated fair value of derivative liabilities	152,201	74,514
Derivatives not designated as hedging instruments | Mortgage derivatives | Mortgage derivatives - interest rate lock commitments
Derivative [Line Items]
Notional Amount	108,135	99,006
Estimated fair value of derivative assets	1,181	2,105
Estimated 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	126,000	105,500
Estimated fair value of derivative assets	233	0
Estimated fair value of derivative liabilities	0	122
Derivatives not designated as hedging instruments | Risk participation agreements
Derivative [Line Items]
Notional Amount	448,186	374,214
Estimated fair value of derivative assets	0	0
Estimated fair value of derivative liabilities	1	36
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional Amount	22,082	22,387
Estimated fair value of derivative assets	423	39
Estimated fair value of derivative liabilities	0	0
Derivatives not designated as hedging instruments | Visa Derivative
Derivative [Line Items]
Notional Amount	0	0
Estimated fair value of derivative assets	0	0
Estimated fair value of derivative liabilities	4,993	3,535
Cash flow hedges
Derivative [Line Items]
Estimated fair value of derivative assets	248	22,004
Estimated fair value of derivative liabilities	182,949	20,395
Cash flow hedges | Interest rate contracts
Derivative [Line Items]
Notional Amount	5,250,000	3,600,000
Estimated fair value of derivative assets	248	22,004
Estimated fair value of derivative liabilities	182,949	20,395
Fair value hedges
Derivative [Line Items]
Estimated fair value of derivative assets	298	0
Estimated fair value of derivative liabilities	4,571	0
Fair value hedges | Interest rate contracts
Derivative [Line Items]
Notional Amount	819,389	0
Estimated fair value of derivative assets	298	0
Estimated fair value of derivative liabilities	$ 4,571	$ 0

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- Definition

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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