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Commitments and contingencies (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Supply Commitment [Line Items] |  |
Loss contingencies for all legal claims | $ 170 | $ 755
Interest rate lock commitments |  |
Supply Commitment [Line Items] |  |
Notional amount | 23,500 | 874
Commitments to extend credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 1,655,373 | 1,712,032
Standby letters of credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 85,052 | 69,763
Other letters of credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 61,792 | 65,822
Commitments to fund investments in affordable housing partnerships |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | $ 34,217 | $ 46,507

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