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

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Loans, Allowance For Credit Losses And OREO (Narrative) (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) contract item	Mar. 31, 2022 contract	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)
Financing Receivable, Modifications [Line Items]
Other real estate owned	$ 540,000,000		$ 566,000,000
Other real estate writedown	$ 26,000,000
Loan modifications that would have been classified as TDRs \| contract	0
Loan modifications classified as TDRs \| contract		0
Consumer mortgage loan secured by residential real estate	$ 0		0
Deferred loan costs	1,054,000		1,114,000
Financing Receivable, Allowance for Credit Losses	$ 7,715,000		$ 6,259,000	$ 6,915,000
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of real estate properties held \| item	0		0
Number of Real Estate Properties \| item	0		0
Financing Receivable, Allowance for Credit Losses	$ 1,858,000		$ 1,351,000	947,000
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses	601,000		1,102,000	$ 1,471,000
Unfunded Loan Commitment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 779,000