Fair Value Measurements (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Aug. 13, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value, transfers between three levels		$ 0	$ 0
Cash and cash equivalents		$ 1,040,000,000.00	888,200,000
Estimated selling costs, percentage reduction		7.00%
Estimated selling costs		10.00%
Short-term Debt		$ 0	0
Time deposits		0	330,000,000.0
Collateral dependent loans			12,200,000
Specific reserves and other write downs on impaired loans		2,888,000	2,067,000
Total loans, gross		5,352,339,000	5,482,121,000
Troubled debt restructured loans balance		1,578,000	5,275,000
Troubled debt restructured loans, specific reserve		$ 591,000	637,000
Senior Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (in hundredths)		4.75%		4.75%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent loans	[1]	$ 8,944,000	12,205,000
SBL Non-Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Specific reserves and other write downs on impaired loans		670,000	525,000
Total loans, gross		137,752,000	108,954,000
Troubled debt restructured loans balance		514,000	$ 650,000
Payment Delay as a result of Payment Deferral [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total loans, gross		651,000
Payment Delay as a result of Payment Deferral [Member] | SBL Non-Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total loans, gross		651,000
Troubled debt restructured loans balance		13,100,000
Troubled debt restructured loans, specific reserve		$ 127,000

[1] The method of valuation approach for the loans evaluated for an ACL on an individual loan basis and also for OREO was the market approach based upon appraisals of the underlying collateral by external appraisers, reduced by 7% to 10% for estimated selling costs. Intangible assets are valued based upon internal analyses.