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Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Gross Carrying Value    
Gross carrying value, beginning balance $ 74,324 $ 12,468
Acquisitions 0 80,812
Year-to-date settlements 31,487 18,956
Gross carrying value, ending balance 42,837 74,324
Accretable Yield    
Accretable yield, beginning balance (132) 0
Acquisitions 0 (196)
Year-to-date settlements 18 64
Accretable yield, ending balance (114) (132)
Nonaccretable Yield    
Nonaccretable yield, beginning balance (31,537) (3,633)
Acquisitions 0 (32,314)
Year-to-date settlements 14,143 4,410
Nonaccretable yield, ending balance (17,394) (31,537)
Net Carrying Value    
Net carrying value, beginning balance 42,655 8,835
Acquisitions 0 48,302
Year-to-date settlements (17,326) (14,482)
Net carrying value, ending balance $ 25,329 $ 42,655