Loans - Summary of balance in allowance for loan losses and recorded investment in loans by class and based on impairment method (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Mar. 31, 2023
Ending allowance balance attributable to loans:
Total ending allowance balance	$ 19,461	$ 20,979	$ 17,523	$ 16,631
Loans:
Total ending loans balance	1,415,494	1,396,774
Real Estate
Loans:
Total ending loans balance	462,648	456,868
Real Estate \| Multifamily
Ending allowance balance attributable to loans:
Total ending allowance balance	4,207	5,116	3,311	3,236
Loans:
Total ending loans balance	364,877	355,165
Collateral dependent nonaccrual loans	8,000	10,900
Real Estate \| Commercial Real Estate
Ending allowance balance attributable to loans:
Total ending allowance balance	663	691	791	823
Loans:
Total ending loans balance	86,797	87,038
Real Estate \| 1-4 Family
Ending allowance balance attributable to loans:
Total ending allowance balance	45	52	61	58
Loans:
Total ending loans balance	10,974	14,665
Commercial
Ending allowance balance attributable to loans:
Total ending allowance balance	13,828	14,283	12,631	12,056
Loans:
Total ending loans balance	934,141	920,567
Consumer
Ending allowance balance attributable to loans:
Total ending allowance balance	718	837	$ 729	$ 458
Loans:
Total ending loans balance	$ 18,705	$ 19,339