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Related party transactions - Related party transactions table (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Beginning of period $ 133,319 $ 182,989
New loans 1,491 1,068
Payments (1,800) (12,040)
Other Changes 44 (38,698)
End of period $ 133,054 $ 133,319