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Loans and Leases - Outstanding Principal Balance and Related Carrying Amounts (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | $ 3,543 | $ 3,604
Carrying amount | 3,441 | 3,471
VIST Financial Corp. (VIST Financial) | Acquired Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 13,290 | 14,337
Carrying amount | 11,309 | 11,962
VIST Financial Corp. (VIST Financial) | Acquired Non-Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 262,362 | 301,128
Carrying amount | 260,159 | 298,615
VIST Financial Corp. (VIST Financial) | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 275,652 | 315,465
Carrying amount | $ 271,468 | $ 310,577

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