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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
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable      
Carrying amount $ 1,643,718 $ 1,831,257 $ 1,883,556
Less: Allowance for loan losses (74,039) (124,147)  
Carrying amount, net of allowance 1,569,679 $ 1,707,110  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable      
Carrying amount 670,566    
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable      
Carrying amount 104,756    
Mortgages      
Accounts, Notes, Loans and Financing Receivable      
Carrying amount 856,618    
Consumer      
Accounts, Notes, Loans and Financing Receivable      
Carrying amount $ 11,778