Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 121,499	$ 130,596	$ 122,874
Gains (Losses) included in earnings	(11,904)	(11,631)	95
Gains (losses) included in OCI	3	(5)	(15)
Additions	1,364	3,601	7,830
Sales	250	(1,269)
Settlements	(158)	207	(188)
Ending Balance	111,054	121,499	130,596
Changes in unrealized gains (losses) included in earnings relating to assets still held	(2,112)	(512)	11,943
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		0	(9,241)
Gains (Losses) included in earnings			9,241
Gains (losses) included in OCI			0
Additions			0
Settlements			0
Ending Balance			0
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss			0
Contingent consideration
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		0	(9,241)
Gains (Losses) included in earnings			9,241
Gains (losses) included in OCI			0
Additions			0
Settlements			0
Ending Balance			0
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss			0
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	606	711	826
Gains (Losses) included in earnings	0	0	0
Gains (losses) included in OCI	3	(5)	(15)
Additions	0	0	0
Sales	0	0
Settlements	(125)	(100)	(100)
Ending Balance	484	606	711
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	2,500	1,000	0
Gains (Losses) included in earnings	(500)	0	0
Gains (losses) included in OCI	0	0	0
Additions	0	1,500	1,000
Sales	250	0
Settlements	0	0	0
Ending Balance	2,250	2,500	1,000
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	5	113	198
Gains (Losses) included in earnings	0	0	(2)
Gains (losses) included in OCI	0	0	0
Additions	0	4	5
Sales	0	0
Settlements	(5)	(112)	(88)
Ending Balance	0	5	113
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	(2)
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	112	215	0
Gains (Losses) included in earnings	0	(2)	4
Gains (losses) included in OCI	0	0	0
Additions	0	0	211
Sales	0	0
Settlements	(28)	(101)	0
Ending Balance	84	112	215
Changes in unrealized gains (losses) included in earnings relating to assets still held	1	(1)	4
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	167	207	280
Gains (Losses) included in earnings	(34)	(40)	(73)
Gains (losses) included in OCI	0	0	0
Additions	0	0	0
Sales	0	0
Settlements	0	0	0
Ending Balance	133	167	207
Changes in unrealized gains (losses) included in earnings relating to assets still held	7	18	(23)
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	118,109	128,350	121,570
Gains (Losses) included in earnings	(11,370)	(11,589)	166
Gains (losses) included in OCI	0	0	0
Additions	1,364	2,097	6,614
Sales	0	(1,269)
Settlements	0	520	0
Ending Balance	108,103	118,109	128,350
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ (2,120)	$ (529)	$ 11,964

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