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Loans and Allowance for Loan Losses (Schedule of Allowances for Loan Losses and Recorded Investment in Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Allowance for loan losses:
Beginning balance	$ 427,597	$ 605,736
Charge-offs	(25,147)	(25,325)
Recoveries	6,538	5,121
Provision for (reversal of) credit losses	5,968	(22,318)
Ending balance	414,956	563,214
Commercial & Industrial
Allowance for loan losses:
Beginning balance	188,364	229,555
Charge-offs	(13,763)	(9,417)
Recoveries	2,363	2,772
Provision for (reversal of) credit losses	1,758	31,867
Ending balance	178,722	254,777
Commercial Real Estate
Allowance for loan losses:
Beginning balance	97,760	130,742
Charge-offs	(2,456)	(10,319)
Recoveries	361	1,026
Provision for (reversal of) credit losses	(969)	(7,637)
Ending balance	94,696	113,812
Consumer
Allowance for loan losses:
Beginning balance	141,473	245,439
Charge-offs	(8,928)	(5,589)
Recoveries	3,814	1,323
Provision for (reversal of) credit losses	5,179	(46,548)
Ending balance	$ 141,538	$ 194,625

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