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Nature of Operations and Summary of Significant Accounting Policies - New Accounting Pronouncements, Policy (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Impairment of goodwill and intangible assets	$ 0
Accounting Standards Update 2016-13 [Member] | SEC Schedule, 12-09, Allowance, Credit Loss
New accounting pronouncement or change in accounting principle effect of adoption	12,000,000
Accounting Standards Update 2016-13 [Member] | Liability for potential losses related to unfunded portion of loans and commitments Member
New accounting pronouncement or change in accounting principle effect of adoption	8,000,000
Accounting Standards Update 2016-13 [Member] | After-tax effect on retained earnings Member
New accounting pronouncement or change in accounting principle effect of adoption	$ 13,000,000

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- Definition

Amount of new accounting pronouncement or change in accounting principle effect of adoption.

+ References

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

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