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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | $ 121,016 | $ 143,160 | $ 120,068 | $ 153,058
Gains (Losses) included in earnings | (5,988) | (20,501) | (11,745) | (33,387)
Gains (losses) included in OCI | (5) | (2) | (6) | (8)
Additions | 3,083 | 2,901 | 9,916 | 6,010
Settlements | (84) | (59) | (211) | (174)
Ending Balance | 118,022 | 125,499 | 118,022 | 125,499
Changes in unrealized gains (losses) included in earnings relating to assets still held | (1,908) | (7,892) | 1,226 | (15,265)
Debt securities available-for-sale | Mortgage Backed Securities |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 938 | 1,151 | 1,014 | 1,182
Gains (Losses) included in earnings | 0 | 0 | 0 | 0
Gains (losses) included in OCI | (5) | (2) | (6) | (8)
Additions | 0 | 0 | 0 | 0
Settlements | (50) | (25) | (125) | (50)
Ending Balance | 883 | 1,124 | 883 | 1,124
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 | 250 | 442 | 278 | 530
Gains (Losses) included in earnings | 0 | 0 | 0 | 0
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 4 | 2 | 28 | 4
Settlements | (34) | (34) | (86) | (124)
Ending Balance | 220 | 410 | 220 | 410
Changes in unrealized gains (losses) included in earnings relating to assets still held | 0 | 0 | (1) | 0
Trading account debt securities | Other |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 361 | 423 | 381 | 440
Gains (Losses) included in earnings | (9) | (10) | (29) | (27)
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Ending Balance | 352 | 413 | 352 | 413
Changes in unrealized gains (losses) included in earnings relating to assets still held | 4 | 0 | 13 | 13
Mortgage Servicing Rights |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Beginning Balance | 119,467 | 141,144 | 118,395 | 150,906
Gains (Losses) included in earnings | (5,979) | (20,491) | (11,716) | (33,360)
Gains (losses) included in OCI | 0 | 0 | 0 | 0
Additions | 3,079 | 2,899 | 9,888 | 6,006
Settlements | 0 | 0 | 0 | 0
Ending Balance | 116,567 | 123,552 | 116,567 | 123,552
Changes in unrealized gains (losses) included in earnings relating to assets still held | $ (1,912) | $ (7,892) | $ 1,214 | $ (15,278)

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