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Allowance for Credit Losses - Loan Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Troubled debt restructuring modifications
Amortized Cost Basis			$ 6,684,000	$ 3,411,000
Commitments related to borrowers experiencing financial difficulty	$ 0		0
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit	6,500,000,000		6,500,000,000		$ 6,500,000,000
Commitments related to borrowers experiencing financial difficulty					$ 5,000,000.0
Financial Asset, 30 to 59 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			141,000	62,000
Financial Asset, 60 to 89 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			425,000	18,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			79,000	18,000
Financial Asset, Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			645,000	98,000
Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			6,039,000	3,313,000
Commercial and Industrial
Troubled debt restructuring modifications
Amortized Cost Basis			371,000	248,000
Commercial and Industrial | Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			371,000	248,000
Construction
Troubled debt restructuring modifications
Amortized Cost Basis				897,000
Construction | Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis				897,000
Commercial Real Estate
Troubled debt restructuring modifications
Amortized Cost Basis			2,308,000	1,214,000
Commercial Real Estate | Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			2,308,000	1,214,000
Residential mortgage
Troubled debt restructuring modifications
Amortized Cost Basis			2,139,000	33,000
Residential mortgage | Financial Asset, 60 to 89 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			323,000
Residential mortgage | Financial Asset, Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			323,000
Residential mortgage | Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			1,816,000	33,000
Consumer
Troubled debt restructuring modifications
Amortized Cost Basis			1,866,000	1,019,000
Consumer | Financial Asset, 30 to 59 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			141,000	62,000
Consumer | Financial Asset, 60 to 89 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			102,000	18,000
Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			79,000	18,000
Consumer | Financial Asset, Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			322,000	98,000
Consumer | Financial Asset, Not Past Due [Member]
Troubled debt restructuring modifications
Amortized Cost Basis			1,544,000	921,000
Interest Rate Reduction
Troubled debt restructuring modifications
Amortized Cost Basis	416,000	$ 255,000	1,384,000	889,000
% of Total Class of Financing Receivable		0.01%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	452,000	$ 166,000	584,000	186,000
Interest Rate Reduction | Consumer
Troubled debt restructuring modifications
Amortized Cost Basis	$ 416,000	$ 255,000	$ 1,384,000	$ 889,000
% of Total Class of Financing Receivable	0.04%	0.02%	0.13%	0.08%
Reduced weighted-average contractual interest rate	13.41%	13.31%	13.53%	13.22%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	$ 452,000	$ 166,000	$ 584,000	$ 186,000
Term Extension
Troubled debt restructuring modifications
Amortized Cost Basis	910,000	$ 831,000	$ 3,534,000	$ 2,522,000
% of Total Class of Financing Receivable		0.01%	0.02%	0.02%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	469,000		$ 469,000
Term Extension | Commercial and Industrial
Troubled debt restructuring modifications
Amortized Cost Basis	$ 115,000	$ 145,000	$ 371,000	$ 248,000
% of Total Class of Financing Receivable		0.01%	0.02%	0.01%
Added weighted-average years to the life of loans	5 years	2 years 7 months 6 days	4 years 3 months 18 days	3 years
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	$ 122,000		$ 122,000
Term Extension | Construction
Troubled debt restructuring modifications
Amortized Cost Basis		$ 669,000		$ 897,000
% of Total Class of Financing Receivable		0.08%		0.10%
Added weighted-average years to the life of loans		1 year		1 year 4 months 24 days
Term Extension | Commercial Real Estate
Troubled debt restructuring modifications
Amortized Cost Basis	$ 705,000		$ 1,873,000	$ 1,214,000
% of Total Class of Financing Receivable	0.02%		0.04%	0.03%
Added weighted-average years to the life of loans	4 months 24 days		9 months 18 days	1 year
Term Extension | Residential mortgage
Troubled debt restructuring modifications
Amortized Cost Basis			$ 1,077,000	$ 33,000
% of Total Class of Financing Receivable			0.03%
Added weighted-average years to the life of loans			9 months 18 days	5 years 10 months 24 days
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	$ 323,000		$ 323,000
Term Extension | Consumer
Troubled debt restructuring modifications
Amortized Cost Basis	$ 90,000	$ 17,000	$ 213,000	$ 130,000
% of Total Class of Financing Receivable			0.02%	0.01%
Added weighted-average years to the life of loans	5 years	2 years 10 months 24 days	4 years 6 months	3 years 7 months 6 days
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	$ 24,000		$ 24,000
Other-Than-Insignificant Payment Delay
Troubled debt restructuring modifications
Amortized Cost Basis			1,062,000
Other-Than-Insignificant Payment Delay | Residential mortgage
Troubled debt restructuring modifications
Amortized Cost Basis			$ 1,062,000
% of Total Class of Financing Receivable			0.03%
Deferred loan payments			$ 172,000

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