Loans and Allowance for Credit Losses - Schedule of Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) payment	Sep. 30, 2023 USD ($) payment	Sep. 30, 2024 USD ($) payment	Sep. 30, 2023 USD ($) payment	Sep. 30, 2024 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 13,174	$ 2,861	$ 33,439	$ 7,006	$ 34,922
% of Total Portfolio	0.07%	0.02%	0.19%	0.05%
Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				$ 533	1,118
30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				133	170
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				400	32
90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				0	916
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				6,473	33,804
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 203	$ 902	$ 1,792
% of Total Portfolio	0.00%	0.00%	0.01%	0.01%
Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 13,007	$ 2,189	$ 24,222	$ 3,222
% of Total Portfolio	0.07%	0.02%	0.14%	0.02%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 0	$ 7,976	$ 259
% of Total Portfolio	0.00%	0.00%	0.04%	0.00%
Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 167	$ 428	$ 291	$ 693
% of Total Portfolio	0.00%	0.00%	0.00%	0.00%
Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 41	$ 7	$ 767
% of Total Portfolio	0.00%	0.00%	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	$ 0	$ 41	$ 106
% of Total Portfolio	0.00%	0.00%	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 | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 10,876		$ 28,978		28,978
% of Total Portfolio	0.15%		0.41%
Other-than-Insignificant Delay in Repayment | payment	6		6
Term Extension			4 years
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					28,978
Commercial Portfolio Segment | Commercial real estate | Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 10,876		$ 21,241
% of Total Portfolio	0.15%		0.30%
Commercial Portfolio Segment | Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0		$ 7,737
% of Total Portfolio	0.00%		0.11%
Commercial Portfolio Segment | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 955		$ 1,058	$ 1,017	1,224
% of Total Portfolio	0.07%		0.08%
Other-than-Insignificant Delay in Repayment | payment	5	6	5	2
Term Extension		4 years 9 months 18 days	2 years 4 months 24 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	36
Commercial Portfolio Segment | Business banking | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				20	4
Commercial Portfolio Segment | Business banking | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				0	32
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				$ 997	1,188
Commercial Portfolio Segment | Business banking | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		12.70%	14.00%	9.80%
Commercial Portfolio Segment | Business banking | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		8.50%	7.50%	7.40%
Commercial Portfolio Segment | Business banking | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 0	$ 32	$ 46
% of Total Portfolio	0.00%	0.00%	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	$ 955	$ 21	$ 955	$ 21
% of Total Portfolio	0.07%	0.00%	0.07%	0.00%
Commercial Portfolio Segment | Business banking | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 0	$ 31	$ 259
% of Total Portfolio	0.00%	0.00%	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	$ 0	$ 41	$ 7	$ 551
% of Total Portfolio	0.00%	0.00%	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	$ 0	$ 33	$ 23
% of Total Portfolio	0.00%	0.00%	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	$ 703		$ 1,023	$ 3,046	1,534
% of Total Portfolio	0.02%		0.03%
Other-than-Insignificant Delay in Repayment | payment	8	8	8	8
Term Extension			2 years	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	400
Residential Real Estate | Residential real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				113	117
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	283
Residential Real Estate | Residential real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				$ 2,933	1,134
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	$ 703	$ 2,084	$ 819	$ 2,517
% of Total Portfolio	0.02%	0.08%	0.02%	0.10%
Residential Real Estate | Residential real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0		$ 204
% of Total Portfolio	0.00%		0.01%
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	$ 640		$ 2,380	$ 2,943	3,186
% of Total Portfolio	0.05%		0.17%
Other-than-Insignificant Delay in Repayment | payment	17	3	11	7
Term Extension			7 years 1 month 6 days	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	682
Consumer Portfolio Segment | Consumer home equity | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				0	49
Consumer Portfolio Segment | Consumer home equity | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				400	0
Consumer Portfolio Segment | Consumer home equity | 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				0	633
Consumer Portfolio Segment | Consumer home equity | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance				$ 2,543	$ 2,504
Consumer Portfolio Segment | Consumer home equity | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8.40%	8.00%	8.10%	7.40%
Consumer Portfolio Segment | Consumer home equity | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	5.70%	4.80%	4.70%	4.40%
Consumer Portfolio Segment | Consumer home equity | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 203	$ 870	$ 1,441
% of Total Portfolio	0.00%	0.02%	0.06%	0.12%
Consumer Portfolio Segment | Consumer home equity | Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 473	$ 84	$ 1,207	$ 684
% of Total Portfolio	0.03%	0.01%	0.09%	0.06%
Consumer Portfolio Segment | Consumer home equity | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0		$ 4
% 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	$ 167	$ 428	$ 291	$ 603
% of Total Portfolio	0.01%	0.04%	0.02%	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%
Consumer Portfolio Segment | Consumer home equity | Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0		$ 8
% of Total Portfolio	0.00%		0.00%