Loans and Leases (Loan Portfolio Segment Balances) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,288,865	$ 3,127,392
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	409,795	390,781
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	21	54
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	436,465	425,552
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	643,973	611,061
Commercial Real Estate Portfolio Segment [Member] | Commercial Investor Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	694,179	640,193
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition, Development and Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	223,103	205,124
Residential Real Estate Portfolio Segment [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	744,195	717,886
Residential Real Estate Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 137,134	$ 136,741