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Related party transactions (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($) property	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)
Related party transactions
Interest bearing deposits	$ 3,377,687,000		$ 3,377,687,000		$ 3,472,036,000
Payment to goods or services from related party	18,000	$ 28,000	154,000	$ 28,000
Related party
Related party transactions
Outstanding balance of non-performing loans			0		0
Interest bearing deposits	139,700,000		139,700,000		$ 132,000,000
Contracted selling price	3,700,000
aggregate carrying value, properties to be sold	4,300,000
Impairment charge	$ 600,000		$ 600,000
Subordinate Notes Due 2030
Related party transactions
Aggregate principal amount						$ 33,000,000
Subordinate Notes Due 2030 | Related party
Related party transactions
Aggregate principal amount						$ 3,000,000
Land and improvements | Related party
Related party transactions
Number of properties sold | property	9
Buildings and improvements | Related party
Related party transactions
Contracted selling price	$ 2

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