Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Unrealized gains (losses) arising during the period	$ 18,842	$ 25,855	$ (23,268)
Change in unrealized gains and losses on junior subordinated debentures carried at fair value, net of taxes	13,996	19,225	(17,328)
Net gain (loss) representing the change in fair value in earnings	16,800	10,600	(2,600)
Servicing Assets at Fair Value [Line Items]
Transfer of loans to loans held for sale	78,146	$ 0	$ 0
Automobile Loan [Member]
Servicing Assets at Fair Value [Line Items]
Transfer of loans to loans held for sale	$ 78,100

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Amount, after tax, before reclassification adjustment, of unrealized gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option.

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Amount, before tax and reclassification adjustment, of unrealized gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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