Loans and Allowance for Credit Losses - Schedule of Summary of Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) payment	Mar. 31, 2023 USD ($) payment	Mar. 31, 2024 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 1,074	$ 2,289	$ 17,755
% of Total Portfolio	0.01%	0.02%
Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 28	1,244
30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		28	808
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	436
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		2,261	16,511
Interest Rate Reduction:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 542	$ 860
% of Total Portfolio	0.00%	0.01%
Other-than-Insignificant Delay in Repayment:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 350
% of Total Portfolio	0.00%	0.00%
Term Extension:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 403	$ 0
% 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	$ 129	$ 239
% of Total Portfolio	0.00%	0.00%
Combination—Interest Rate Reduction & Term Extension:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 680
% of Total Portfolio	0.00%	0.00%
Combination—Term Extension & Other-than-Insignificant Delay in Repayment:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 29
% 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	$ 131
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 165	$ 731
% of Total Portfolio	0.01%	0.07%
Commercial Portfolio Segment | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			10,506
Commercial Portfolio Segment | Commercial real estate | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			0
Commercial Portfolio Segment | Commercial real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			0
Commercial Portfolio Segment | Commercial real estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			0
Commercial Portfolio Segment | Commercial real estate | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			0
Commercial Portfolio Segment | Commercial real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance			10,506
Commercial Portfolio Segment | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 731	734
Other-than-Insignificant Delay in Repayment | payment		3
Term Extension	1 year 7 months 6 days	4 years 2 months 12 days
Commercial Portfolio Segment | Business banking | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 28	34
Commercial Portfolio Segment | Business banking | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		28	34
Commercial Portfolio Segment | Business banking | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
Commercial Portfolio Segment | Business banking | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
Commercial Portfolio Segment | Business banking | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 703	700
Commercial Portfolio Segment | Business banking | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		9.50%
Commercial Portfolio Segment | Business banking | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		6.90%
Commercial Portfolio Segment | Business banking | Interest Rate Reduction:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 47
% of Total Portfolio	0.00%	0.00%
Commercial Portfolio Segment | Business banking | Term Extension:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 165	$ 0
% of Total Portfolio	0.01%	0.00%
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	$ 64
% 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	$ 0	$ 460
% of Total Portfolio	0.00%	0.04%
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	$ 29
% 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	$ 131
% of Total Portfolio	0.00%	0.01%
Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 238	$ 327
% of Total Portfolio	0.01%	0.01%
Residential Real Estate | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 327	3,588
Other-than-Insignificant Delay in Repayment | payment		9
Term Extension	2 years
Residential Real Estate | Residential real estate | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 0	810
Residential Real Estate | Residential real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	774
Residential Real Estate | Residential real estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
Residential Real Estate | Residential real estate | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	36
Residential Real Estate | Residential real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		327	2,778
Residential Real Estate | Residential real estate | Other-than-Insignificant Delay in Repayment:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 327
% of Total Portfolio	0.00%	0.01%
Residential Real Estate | Residential real estate | Term Extension:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 238	$ 0
% of Total Portfolio	0.01%	0.00%
Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 671	$ 1,231
% of Total Portfolio	0.06%	0.10%
Consumer Portfolio Segment | Consumer home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 1,231	2,927
Other-than-Insignificant Delay in Repayment | payment	7	6
Term Extension		7 months 6 days
Consumer Portfolio Segment | Consumer home equity | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 0	400
Consumer Portfolio Segment | Consumer home equity | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
Consumer Portfolio Segment | Consumer home equity | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	0
Consumer Portfolio Segment | Consumer home equity | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0	400
Consumer Portfolio Segment | Consumer home equity | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 1,231	$ 2,527
Consumer Portfolio Segment | Consumer home equity | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8.00%	7.00%
Consumer Portfolio Segment | Consumer home equity | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	4.40%	4.40%
Consumer Portfolio Segment | Consumer home equity | Interest Rate Reduction:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 542	$ 813
% of Total Portfolio	0.04%	0.07%
Consumer Portfolio Segment | Consumer home equity | 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%
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	$ 129	$ 175
% of Total Portfolio	0.01%	0.01%
Consumer Portfolio Segment | Consumer home equity | Combination—Interest Rate Reduction & Term Extension:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 220
% of Total Portfolio	0.00%	0.02%