Loan Portfolio Segment Balances (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 2,832,813	$ 2,784,266
Residential Mortgage | Residential Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	640,939	618,381
Residential Construction | Residential Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	143,109	129,177
Commercial Owner Occupied Real Estate | Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	582,472	592,823
Commercial Investor Real Estate | Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	573,634	552,178
Commercial Acquisition, Development and Construction | Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	163,343	160,696
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	348,180	356,651
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	439	703
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 380,697	$ 373,657