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Loans - Carrying amount of acquired loans accounted for pursuant to ASC310-30 by portfolio (Details) - ASC Subtopic 310-30 - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable            
Carrying amount $ 1,702,374 $ 1,789,237 $ 1,883,556 $ 1,990,622 $ 2,033,457 $ 2,108,993
Less: Allowance for loan losses (94,610)   (122,135) (168,559)    
Carrying amount, net of allowance 1,607,764   1,761,421 $ 1,822,063    
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable            
Carrying amount 683,046   801,774      
Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable            
Carrying amount 134,962   84,465      
Mortgages            
Accounts, Notes, Loans and Financing Receivable            
Carrying amount 871,803   982,821      
Consumer            
Accounts, Notes, Loans and Financing Receivable            
Carrying amount $ 12,563   $ 14,496