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Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | $ 116,209 | $ 123,314 | $ 121,499 | $ 130,596
Gains (Losses) included in earnings | (4,900) | (2,796) | (10,793) | (10,407)
Gains (losses) included in OCI | 2 | (2) | 2 | (8)
Additions | 337 | 574 | 998 | 1,818
Sales |  |  |  | (1,269)
Settlements | (25) | (72) | (83) | 288
Ending Balance | 111,623 | 121,018 | 111,623 | 121,018
Changes in unrealized gains (losses) included in earnings relating to assets still held | (2,571) | (377) | (3,261) | (1,807)
Debt securities available-for-sale | Mortgage Backed Securities - federal agencies |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 581 | 655 | 606 | 711
Gains (Losses) included in earnings | 0 | 0 | 0 | 0
Gains (losses) included in OCI | 2 | (2) | 2 | (8)
Additions | 0 | 0 | 0 | 0
Sales |  |  |  | 0
Settlements | (25) | 0 | (50) | (50)
Ending Balance | 558 | 653 | 558 | 653
Changes in unrealized gains (losses) included in earnings relating to assets still held | 0 | 0 | 0 | 0
Debt securities available-for-sale | Other |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 2,000 | 1,000 | 2,500 | 1,000
Gains (Losses) included in earnings | 0 | 0 | (500) | 0
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 0 | 0 | 0 | 0
Sales |  |  |  | 0
Settlements | 0 | 0 | 0 | 0
Ending Balance | 2,000 | 1,000 | 2,000 | 1,000
Changes in unrealized gains (losses) included in earnings relating to assets still held | 0 | 0 | 0 | 0
Trading account debt securities | CMO |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance |  | 56 | 5 | 113
Gains (Losses) included in earnings |  | 0 | 0 | 0
Gains (losses) included in OCI |  | 0 | 0 | 0
Additions |  | 0 | 0 | 4
Sales |  |  |  | 0
Settlements |  | (46) | (5) | (107)
Ending Balance | 0 | 10 | 0 | 10
Changes in unrealized gains (losses) included in earnings relating to assets still held |  | 0 | 0 | 0
Trading account debt securities | Mortgage Backed Securities - federal agencies |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 84 | 163 | 112 | 215
Gains (Losses) included in earnings | 0 | 0 | 0 | (2)
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 0 | 0 | 0 | 0
Sales |  |  |  | 0
Settlements | 0 | (26) | (28) | (76)
Ending Balance | 84 | 137 | 84 | 137
Changes in unrealized gains (losses) included in earnings relating to assets still held | 0 | 0 | 0 | (1)
Trading account debt securities | Other |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 158 | 191 | 167 | 207
Gains (Losses) included in earnings | (4) | (3) | (13) | (19)
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 0 | 0 | 0 | 0
Sales |  |  |  | 0
Settlements | 0 | 0 | 0 | 0
Ending Balance | 154 | 188 | 154 | 188
Changes in unrealized gains (losses) included in earnings relating to assets still held | 6 | 4 | 18 | 22
Mortgage Servicing Rights |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 113,386 | 121,249 | 118,109 | 128,350
Gains (Losses) included in earnings | (4,896) | (2,793) | (10,280) | (10,386)
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 337 | 574 | 998 | 1,814
Sales |  |  |  | (1,269)
Settlements | 0 | 0 | 0 | 521
Ending Balance | 108,827 | 119,030 | 108,827 | 119,030
Changes in unrealized gains (losses) included in earnings relating to assets still held | $ (2,577) | $ (381) | $ (3,279) | $ (1,828)

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