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FDIC loss-share asset and true-up payment obligation - Activity in the FDIC loss share indemnification asset (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
FDIC Indemnification Asset [Roll Forward]      
Beginning Balance $ 45,659 $ 46,316  
FDIC loss-sharing termination agreement (45,659) (45,659)  
Amortization 0 (934)  
Credit impairment losses to be covered under loss sharing agreements 0 104  
Reimbursable expenses 0 537  
Net payment from FDIC under loss-sharing agreements 0 (364)  
Ending Balance 0 0  
Balance due to the FDIC for recoveries on covered assets 0 0  
FDIC loss-share asset net $ 0 $ 0 $ 44,500