Loans and Leases (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Acquired Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 5,732	$ 2,526
Carrying amount	5,469	2,263
VIST Financial Corp. ("VIST Financial") [Member] | Acquired Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	40,545	44,273
Carrying amount	31,003	34,410
VIST Financial Corp. ("VIST Financial") [Member] | Acquired Non Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	503,249	525,182
Carrying amount	498,021	518,904
VIST Financial Corp. ("VIST Financial") [Member] | Acquired Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	543,794	569,455
Carrying amount	$ 529,024	$ 553,314