Guarantees (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2021	Dec. 31, 2020
Guarantor Obligations [Line Items]
Derivative Liabilities	[1]	$ 13,349	$ 18,675
Notional amount of underlying interest rate swaps associated with risk participation agreements		2,977,293	$ 3,015,189
Financial Standby Letter Of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit, net liability		2,900
Contractual amount of letters of credit, guaranteed maximum potential future payments		412,700
Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]
Guarantor Obligations [Line Items]
Derivative Liabilities		333
Notional amount of underlying interest rate swaps associated with risk participation agreements		$ 265,600
Minimum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years		2 years
Maximum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years		11 years

[1] * The fair value of each class of derivative is shown in Note 11.