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Loans and Leases - Outstanding Principal Balance (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance $ 3,820 $ 3,604
Carrying amount 3,687 3,471
VIST Financial Corp. (VIST Financial) | Acquired Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance 14,013 14,337
Carrying amount 11,774 11,962
VIST Financial Corp. (VIST Financial) | Acquired Non-Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance 287,337 301,128
Carrying amount 284,991 298,615
VIST Financial Corp. (VIST Financial) | Total Acquired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance 301,350 315,465
Carrying amount $ 296,765 $ 310,577