Loans, Leases and Allowance - Summarizes Changes in the Allowance for Credit Losses (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Allowance for loan losses:
Allowance for loan and lease losses, beginning	$ 16,219,000	$ 15,882,000	$ 15,790,885	$ 15,663,000	$ 15,663,000
Provision for (reversal of) credit losses	463,000	337,000	1,913,000	1,330,000
Charge-offs	(463,000)	(513,000)	(1,728,000)	(1,532,000)	(2,042,000)
Recoveries	146,000	67,000	389,000	312,000
Allowance for loan and lease losses, ending	16,364,629	15,773,000	16,364,629	15,773,000	15,790,885
Commercial mortgage
Allowance for loan losses:
Allowance for loan and lease losses, beginning	4,788,000	4,781,000	4,486,000	4,655,000	4,655,000
Provision for (reversal of) credit losses	(157,000)	(531,000)	145,000	(405,000)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan and lease losses, ending	4,631,000	4,250,000	4,631,000	4,250,000	4,486,000
Commercial and industrial
Allowance for loan losses:
Allowance for loan and lease losses, beginning	1,660,000	1,421,000	1,483,000	1,281,000	1,281,000
Provision for (reversal of) credit losses	53,000	152,000	225,000	217,000
Charge-offs	(2,000)	(16,000)	(2,000)	(16,000)	(16,000)
Recoveries	11,000	3,000	16,000	78,000
Allowance for loan and lease losses, ending	1,722,000	1,560,000	1,722,000	1,560,000	1,483,000
Construction and development
Allowance for loan losses:
Allowance for loan and lease losses, beginning	2,143,000	3,464,000	2,243,000	3,883,000	3,883,000
Provision for (reversal of) credit losses	153,000	(1,096,000)	53,000	(1,515,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan and lease losses, ending	2,296,000	2,368,000	2,296,000	2,368,000	2,243,000
Multi-family
Allowance for loan losses:
Allowance for loan and lease losses, beginning	2,652,000	2,097,000	2,660,000	1,789,000	1,789,000
Provision for (reversal of) credit losses	(85,000)	500,000	(93,000)	808,000
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan and lease losses, ending	2,567,000	2,597,000	2,567,000	2,597,000	2,660,000
Residential mortgage
Allowance for loan losses:
Allowance for loan and lease losses, beginning	1,876,000	1,761,000	1,910,000	1,681,000	1,681,000
Provision for (reversal of) credit losses	(52,000)	220,000	(108,000)	301,000
Charge-offs	0	0	0	(10,000)
Recoveries	2,000	2,000	24,000	11,000
Allowance for loan and lease losses, ending	1,826,000	1,983,000	1,826,000	1,983,000	1,910,000
Home equity
Allowance for loan losses:
Allowance for loan and lease losses, beginning	211,000	133,000	184,000	102,000	102,000
Provision for (reversal of) credit losses	(34,000)	43,000	(7,000)	74,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan and lease losses, ending	177,000	176,000	177,000	176,000	184,000
Direct financing leases
Allowance for loan losses:
Allowance for loan and lease losses, beginning	2,512,000	1,920,000	2,469,000	1,955,000	1,955,000
Provision for (reversal of) credit losses	553,000	983,000	1,595,000	1,706,000
Charge-offs	(400,000)	(463,000)	(1,565,000)	(1,334,000)
Recoveries	118,000	18,000	284,000	131,000
Allowance for loan and lease losses, ending	2,783,000	2,458,000	2,783,000	2,458,000	2,469,000
Consumer
Allowance for loan losses:
Allowance for loan and lease losses, beginning	377,000	305,000	356,000	317,000	317,000
Provision for (reversal of) credit losses	32,000	66,000	103,000	144,000
Charge-offs	(61,000)	(34,000)	(161,000)	(172,000)
Recoveries	15,000	44,000	65,000	92,000
Allowance for loan and lease losses, ending	$ 363,000	$ 381,000	$ 363,000	$ 381,000	$ 356,000