Amount, after recoveries, of loans and leases that have been written-off.

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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Amount of financing receivable on nonaccrual status with no allowance for credit loss.

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Amount of expense related to estimated loss from loan and lease transactions.

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Allowance for Credit Losses (Allowance for Credit Losses Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual loans with no related allowance for credit losses	$ 56,800
Loans reasonably expected to be modified into TDRs	198
Allowance for loan losses	321,209	$ 253,412	$ 379,910		$ 158,461
Provision for credit losses	(45,386)	52,965
Loan net charge-offs	13,300
Allowance for held-to-maturity securities losses	99	70	59
Provision for credit losses	39
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses			47,344
Allowance for held-to-maturity securities losses				$ 74
Loans acquired with deteriorated credit quality \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses				11,000
Loans acquired without deteriorated credit quality \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses				3,200
Unfunded lending-related commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	43,500	37,362	60,536
Unfunded lending-related commitments \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses				33,200
Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	$ 277,709	$ 216,050	$ 319,374
Loans \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses				$ 14,200