Allowance for Credit Losses - Loan Modified to Borrowers Experiencing Financial Difficulty (Details)	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 794,000
Commitments to extend credit, standby letters of credit, and commercial letters of credit	7,100,000,000
30 - 59 Days Past Due
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	9,000
Total Past Due
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	9,000
Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	785,000
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	96,000
Commercial and Industrial | Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	96,000
Construction
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	231,000
Construction | Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	231,000
Commercial real estate
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	4,000
Commercial real estate | Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	4,000
Residential mortgage
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	34,000
Residential mortgage | Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	34,000
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	429,000
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	9,000
Consumer Portfolio Segment [Member] | Total Past Due
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	9,000
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	420,000
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	362,000
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	10,000
Interest Rate Reduction | Commercial real estate
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 4,000
Reduced weighted-average contractual interest rate	0.75%
Interest Rate Reduction | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 358,000
% of Total Class of Financing Receivable	$ 0.03
Reduced weighted-average contractual interest rate	13.51%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted	$ 10,000
Term Extension
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	432,000
Term Extension | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 96,000
Added weighted-average years to the life of loans	3 years
Term Extension | Construction
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 231,000
% of Total Class of Financing Receivable	$ 0.03
Added weighted-average years to the life of loans	2 years 10 months 24 days
Term Extension | Residential mortgage
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 34,000
Added weighted-average years to the life of loans	5 years 10 months 24 days
Term Extension | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Amortized Cost Basis	$ 71,000
% of Total Class of Financing Receivable	$ 0.01
Added weighted-average years to the life of loans	4 years 7 months 6 days
Combination - Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Commitments to extend credit, standby letters of credit, and commercial letters of credit	$ 5,000,000.0