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Loans and Leases - Outstanding Principal Balance and Related Carrying Amounts (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | $ 3,706 | $ 3,652
Carrying amount | 3,521 | 3,438
VIST Financial Corp. (VIST Financial) | Acquired Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 12,564 | 12,822
Carrying amount | 10,793 | 11,036
VIST Financial Corp. (VIST Financial) | Acquired Non-Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 248,091 | 256,265
Carrying amount | 246,104 | 254,162
VIST Financial Corp. (VIST Financial) | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 260,655 | 269,087
Carrying amount | $ 256,897 | $ 265,198

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