Ok, finally solve with the help of Gtk Inspector. With these rules you can customize a dark theme for sidebar and dialogs (I didn't want to customize entire interface):

#GeanyDialog GtkButton,
#GeanyDialog GtkButton GtkLabel,
#GeanyDialog GtkButton GtkImage,
#GeanyDialog GtkWidget GtkEntry,
#GeanyDialog GtkWidget GtkButton
{
background: #f0f0f0;
color: #000;
}

#GeanyDialogSearch,
#GeanyDialog,
GtkTreeView
{
background: #1e1e1e;
color: #fff;
}

#GeanyDialog GtkWidget
{
background: transparent;
}

GtkTreeView:hover,
GtkTreeView:insensitive,
GtkTreeView:active {
background: #666;
}

GtkTreeView:selected {
background-color: #2F5692;
color: #fff;
}

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