Loans and Leases (Loans Acquired By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 1,029,426	$ 1,809,235
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	781,307	1,450,035
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	78,915	237,906
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	642,891	1,054,473
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	41,381	107,119
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	17,254	49,463
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	866	1,074
Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	248,119	359,200
Noncommerical | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	213,851	297,926
Noncommerical | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	30,834	38,710
Noncommerical | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	2,583	20,793
Noncommerical | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 851	$ 1,771