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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, 2021	Mar. 31, 2020
Allowance for loan losses:
Beginning balance	$ 605,736	$ 281,402
Charge-offs	25,325	23,874
Recoveries	5,121	3,813
Provision for (reversal of) loan losses	(22,318)	149,117
Ending balance	563,214	493,452
Reserve for unfunded commitments	51,500
All Financing Receivable, Allowance for Credit Loss	614,700
Allowance for credit loss, increase	38,800
(Reversal of) provision for credit losses	$ (18,575)	158,722
ACL to loans ratio	1.58%
Interest Income Recorded
Allowance for loan losses:
Interest income recognized	$ 3,400	2,100
Impact from Adoption
Allowance for loan losses:
Beginning balance		82,994
Beginning balance, after adoption of ASC 326
Allowance for loan losses:
Beginning balance		364,396
Commercial & Industrial
Allowance for loan losses:
Beginning balance	229,555	145,782
Charge-offs	9,417	14,885
Recoveries	2,772	1,741
Provision for (reversal of) loan losses	31,867	86,622
Ending balance	254,777	216,950
Commercial & Industrial | Impact from Adoption
Allowance for loan losses:
Beginning balance		(2,310)
Commercial & Industrial | Beginning balance, after adoption of ASC 326
Allowance for loan losses:
Beginning balance		143,472
Commercial Real Estate
Allowance for loan losses:
Beginning balance	130,742	67,430
Charge-offs	10,319	1,017
Recoveries	1,026	399
Provision for (reversal of) loan losses	(7,637)	40,956
Ending balance	113,812	107,117
Commercial Real Estate | Impact from Adoption
Allowance for loan losses:
Beginning balance		(651)
Commercial Real Estate | Beginning balance, after adoption of ASC 326
Allowance for loan losses:
Beginning balance		66,779
Consumer
Allowance for loan losses:
Beginning balance	245,439	68,190
Charge-offs	5,589	7,972
Recoveries	1,323	1,673
Provision for (reversal of) loan losses	(46,548)	21,539
Ending balance	$ 194,625	169,385
Consumer | Impact from Adoption
Allowance for loan losses:
Beginning balance		85,955
Consumer | Beginning balance, after adoption of ASC 326
Allowance for loan losses:
Beginning balance		$ 154,145

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