Fair Value Measurements - Qualitative Valuation (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Measured on non-recurring basis
Fair Value
Impaired loans	$ 5,000
Mortgage servicing rights	2,919	$ 2,107
Significant Unobservable Inputs (Level 3)
Fair Value
Impaired loans	6,847,626	6,771,095
Significant Unobservable Inputs (Level 3) | Measured on non-recurring basis
Fair Value
Impaired loans	5,000
Mortgage servicing rights	$ 2,919	$ 2,107
Significant Unobservable Inputs (Level 3) | Contracted modification agreement. | Measured on non-recurring basis | Other
Unobservable Inputs
Impaired loans	0
Significant Unobservable Inputs (Level 3) | Contracted modification agreement. | Measured on non-recurring basis | Weighted Average | Other
Unobservable Inputs
Impaired loans	0
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Minimum | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.044	0.055
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Maximum | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.254	0.271
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Weighted Average | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.072	0.086
Significant Unobservable Inputs (Level 3) | Discount rate | Measured on non-recurring basis | Weighted Average | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.1550	0.1450