Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	$ 15,992	$ 18,270	$ 18,882	$ 19,064
Total ending loans balance	7,448	10,627	7,960
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,312	1,945
Allowance For Loan Losses, Collectively evaluated for impairment	14,291	16,325
Loans acquired with deteriorated credit quality	389
Total ending allowance balance	15,992	18,270
Commercial [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,312	1,945
Allowance For Loan Losses, Collectively evaluated for impairment	4,963	5,826
Loans acquired with deteriorated credit quality	389
Total ending allowance balance	6,664	7,771
Real Estate [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	3,462	3,204
Loans acquired with deteriorated credit quality
Total ending allowance balance	3,462	3,204
Consumer [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	4,228	5,590
Loans acquired with deteriorated credit quality
Total ending allowance balance	4,228	5,590
Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,448	10,597
Loans: Collectively evaluated for impairment	1,054,157	1,166,094
Loans acquired with deteriorated credit quality	10,409	17,543
Total ending loans balance	1,072,014	1,194,234
Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,448	10,597
Loans: Collectively evaluated for impairment	489,547	435,544
Loans acquired with deteriorated credit quality	9,355	15,699
Total ending loans balance	506,350	461,840
Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	186,526	190,224
Loans acquired with deteriorated credit quality	24	68
Total ending loans balance	186,550	190,292
Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	279,448	288,398
Loans acquired with deteriorated credit quality	1,030	1,776
Total ending loans balance	280,478	290,174
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	1,638	1,705
Loans acquired with deteriorated credit quality
Total ending allowance balance	1,638	1,705
Mortgage Warehousing [Member] | Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	98,636	251,928
Total ending loans balance	$ 98,636	$ 251,928