Loans and Leases (Loan Portfolio Segment Balances) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,412,439	$ 3,127,392
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	423,855	390,781
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	19	54
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	444,729	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	680,601	611,061
Commercial Real Estate Portfolio Segment [Member] | Commercial Investor Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	710,694	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	239,160	205,124
Residential Real Estate Portfolio Segment [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	773,889	717,886
Residential Real Estate Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 139,492	$ 136,741