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Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans - (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans    
Improved expected cash flows $ 7,800  
Acquired credit impaired loans    
Changes in the carrying value of acquired loans at the acquisition date    
Balance at the beginning of the period 602,546 $ 733,870
Fair value of acquired loans 55,850  
Net reductions for payments, foreclosures, and accretion (79,258) (101,556)
Change in the allowance for loan losses on acquired loans (275) 303
Balance at the end of the period 578,863 632,617
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans    
Balance at beginning of period 155,379 201,538
Addition from the Southeastern acquisition 4,603  
Accretion (43,873) (56,850)
Reclass of nonaccretable difference due to improvement in expected cash flows 16,772 18,631
Other changes, net (306) 779
Balance at end of period $ 132,575 164,098
Decline in accretable yield balance   $ 14,300