Loans and Leases (Loans Acquired By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 1,270,818	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	923,076	781,307
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	106,670	78,915
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	728,872	642,891
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	47,826	41,381
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	38,838	17,254
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	870	866
Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	347,742	248,119
Noncommerical | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	291,254	213,851
Noncommerical | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	25,776	30,834
Noncommerical | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	28,151	2,583
Noncommerical | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired	$ 2,561	$ 851