Loans and Leases (Loans Acquired By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 996,280	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	702,761	781,307
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	59,808	78,915
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	579,435	642,891
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	36,043	41,381
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	25,813	17,254
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	1,662	866
Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	293,519	248,119
Noncommerical | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	240,681	213,851
Noncommerical | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	50,048	30,834
Noncommerical | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	1,144	2,583
Noncommerical | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 1,646	$ 851