Loans and Allowance for Credit Losses - Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) payment	Sep. 30, 2023 USD ($) payment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,861	$ 7,006
% of Total Portfolio	0.02%	0.05%
Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 533
30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		133
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		400
90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		6,473
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 203	$ 1,792
% of Total Portfolio	0.00%	0.01%
Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,189	$ 3,222
% of Total Portfolio	0.02%	0.02%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 259
% of Total Portfolio	0.00%	0.00%
Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 428	$ 693
% of Total Portfolio	0.00%	0.00%
Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 41	$ 767
% of Total Portfolio	0.00%	0.01%
Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 167
% of Total Portfolio	0.00%	0.00%
Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 106
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 62	$ 1,016
% of Total Portfolio	0.01%	0.09%
Commercial Portfolio Segment | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 1,017
Other-than-Insignificant Delay in Repayment | payment	6	2
Term Extension	4 years 9 months 18 days	5 years 1 month 6 days
Commercial Portfolio Segment | Business banking | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 20
Commercial Portfolio Segment | Business banking | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		20
Commercial Portfolio Segment | Business banking | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Commercial Portfolio Segment | Business banking | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Commercial Portfolio Segment | Business banking | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 997
Commercial Portfolio Segment | Business banking | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	12.70%	9.80%
Commercial Portfolio Segment | Business banking | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8.50%	7.40%
Commercial Portfolio Segment | Business banking | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 46
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment | Business banking | Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 21	$ 21
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment | Business banking | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 259
% of Total Portfolio	0.00%	0.02%
Commercial Portfolio Segment | Business banking | Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 90
% of Total Portfolio	0.00%	0.01%
Commercial Portfolio Segment | Business banking | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 41	$ 551
% of Total Portfolio	0.00%	0.05%
Commercial Portfolio Segment | Business banking | Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 26
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment | Business banking | Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 23
% of Total Portfolio	0.00%	0.00%
Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,084	$ 3,046
% of Total Portfolio	0.08%	0.12%
Residential Real Estate | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 3,046
Other-than-Insignificant Delay in Repayment | payment	8	8
Term Extension		23 years 8 months 12 days
Residential Real Estate | Residential real estate | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 113
Residential Real Estate | Residential real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		113
Residential Real Estate | Residential real estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Residential Real Estate | Residential real estate | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Residential Real Estate | Residential real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,933
Residential Real Estate | Residential real estate | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		5.40%
Residential Real Estate | Residential real estate | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		3.60%
Residential Real Estate | Residential real estate | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 305
% of Total Portfolio	0.00%	0.01%
Residential Real Estate | Residential real estate | Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,084	$ 2,517
% of Total Portfolio	0.08%	0.10%
Residential Real Estate | Residential real estate | Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 141
% of Total Portfolio	0.00%	0.01%
Residential Real Estate | Residential real estate | Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 83
% of Total Portfolio	0.00%	0.00%
Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 715	$ 2,944
% of Total Portfolio	0.06%	0.25%
Consumer Portfolio Segment | Consumer home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,943
Other-than-Insignificant Delay in Repayment | payment	3	7
Term Extension		17 years 2 months 12 days
Consumer Portfolio Segment | Consumer home equity | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 400
Consumer Portfolio Segment | Consumer home equity | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Consumer Portfolio Segment | Consumer home equity | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		400
Consumer Portfolio Segment | Consumer home equity | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Consumer Portfolio Segment | Consumer home equity | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,543
Consumer Portfolio Segment | Consumer home equity | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8.00%	7.40%
Consumer Portfolio Segment | Consumer home equity | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	4.80%	4.40%
Consumer Portfolio Segment | Consumer home equity | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 203	$ 1,441
% of Total Portfolio	0.02%	0.12%
Consumer Portfolio Segment | Consumer home equity | Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 84	$ 684
% of Total Portfolio	0.01%	0.06%
Consumer Portfolio Segment | Consumer home equity | Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 428	$ 603
% of Total Portfolio	0.04%	0.05%
Consumer Portfolio Segment | Consumer home equity | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 216
% of Total Portfolio	0.00%	0.02%