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Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans - (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans    
Improved expected cash flows $ 4,000  
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 (55,569) (74,989)
Change in the allowance for loan losses on acquired loans (346) (46)
Balance at the end of the period 602,481 658,835
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 (29,511) (39,522)
Reclass of nonaccretable difference due to improvement in expected cash flows 9,016 13,146
Other changes, net (204) 358
Balance at end of period $ 139,283 175,520
Decline in accretable yield balance   $ 14,300