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Non-Covered Loans and Allowance for Non-Covered Loan Losses - PCI Loans (Details) - PCI loans - Noncovered - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Carrying values and the outstanding contractual balances of the PCI loans          
Carrying amount $ 37,937   $ 37,937   $ 51,432
Outstanding balance 52,096   52,096   67,988
Changes in the accretable yield for the acquired impaired loans          
Balance, beginning of period 9,793 $ 15,229 13,116 $ 17,744  
Reclassifications from nonaccretable difference, net 277 708 854 4,655  
Disposals of loans (603)   (664)    
Accretion (1,851) (1,884) (5,690) (8,346)  
Balance, end of period 7,616 $ 14,053 7,616 $ 14,053  
Nonaccretable difference $ 20,200   $ 20,200   $ 22,800