Fair Value Measurements - Fair Value Measurement and Assumptions (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Doubtful and Impaired commercial collateral dependent loans	$ 99,835,000	$ 99,835,000	$ 46,491,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	38,167,000	38,167,000	1,272,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	520,000	520,000	35,061,000
Charges to allowance for probable loan losses in connection with other real estate owned	0	2,228,000	0
Adjustment to fair value in connection with other real estate owned	355,000	371,000	2,538,000
Fair Value, Measurements, Nonrecurring
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	10,985,000	10,985,000	10,221,000
Change in net provision, other real estate owned	371,000	371,000	2,538,000
Fair Value, Measurements, Nonrecurring | Estimated Fair Value
Assets:
Watch-List doubtful loans	55,479,000	55,479,000	46,124,000
Non-financial assets:
Other real estate owned	2,627,000	2,627,000	307,000
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Fair Value, Inputs, Level 3
Assets:
Watch-List doubtful loans	55,479,000	55,479,000	46,124,000
Non-financial assets:
Other real estate owned	$ 2,627,000	$ 2,627,000	$ 307,000