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Loans - Changes in the carrying amount and the accretable yield for the acquired loans - Parenthetical (Details) - ASC Subtopic 310-30 - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable            
Carrying amount $ 1,789,237 $ 1,831,257 $ 1,883,556 $ 2,033,457 $ 2,085,191 $ 2,108,993
Accretable yield 1,042,407 $ 1,068,167 $ 1,092,504 1,178,042 $ 1,204,726 $ 1,214,488
Non-credit Impaired Loans            
Accounts, Notes, Loans and Financing Receivable            
Carrying amount 1,500,000     1,300,000    
Accretable yield $ 900,000     $ 700,000