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Related party transactions (Details) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 06, 2025	Jun. 01, 2020	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Related party transactions
Interest bearing deposits	$ 3,387,752			$ 3,387,752		$ 3,387,752		$ 3,472,036
Payment to goods or services from related party				50	$ 0	136	$ 6
Related party
Related party transactions
Outstanding balance of non-performing loans						0		0
Interest bearing deposits	155,500			155,500		155,500		132,000
Subordinate Notes Due 2030
Related party transactions
Aggregate principal amount	$ 33,000			33,000		33,000
Interest rate	5.375%		5.375%
Subordinate Notes Due 2030 | Related party
Related party transactions
Aggregate principal amount	$ 3,000			$ 3,000		$ 3,000		$ 3,000
Subordinate Notes Due 2035
Related party transactions
Aggregate principal amount		$ 85,000
Interest rate		7.75%

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