Commitments and Contingencies (Schedule for Unfunded Commitments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Unused Commitments to Extend Credit	$ 7,152,331	$ 6,755,563
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		2,367	$ 2,506
Provision			(139)
Ending balance			2,367
Accounting Standards Update 2016-13 [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	0	9,139	0
Ending balance		0	9,139
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	12,755	2,367
Provision	349	1,249
Ending balance	$ 13,104	$ 12,755	$ 2,367