Loans and Leases - Outstanding Principal Balance and Related Carrying Amounts (Details) - USD ($) $ in Thousands |
Jun. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Total Acquired Loans | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Outstanding principal balance | $ 3,689 | $ 3,652 |
| Carrying amount | 3,504 | 3,438 |
| VIST Financial Corp. (VIST Financial) | Acquired Credit Impaired Loans | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Outstanding principal balance | 12,100 | 12,822 |
| Carrying amount | 10,464 | 11,036 |
| VIST Financial Corp. (VIST Financial) | Acquired Non-Credit Impaired Loans | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Outstanding principal balance | 238,802 | 256,265 |
| Carrying amount | 236,855 | 254,162 |
| VIST Financial Corp. (VIST Financial) | Total Acquired Loans | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Outstanding principal balance | 250,902 | 269,087 |
| Carrying amount | $ 247,319 | $ 265,198 |