Troubled Debt Restructured Loans for Specific Segments of the Loan Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Restructured accruing	$ 3,003	$ 3,614
Restructured non-accruing	425	1,304
Balance	3,428	4,918
Specific allowance	141	1,223
Restructured and subsequently defaulted	0	0
Commercial
Financing Receivable, Modifications [Line Items]
Restructured accruing	87	2,600
Restructured non-accruing	425	0
Balance	512	2,600
Specific allowance	141	552
Restructured and subsequently defaulted	0	0
All Other
Financing Receivable, Modifications [Line Items]
Restructured accruing	2,064	0
Restructured non-accruing	0	1,304
Balance	2,064	1,304
Specific allowance	0	467
Restructured and subsequently defaulted	0	0
Commercial Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Restructured accruing	0	0
Restructured non-accruing	0	0
Balance	0	0
Specific allowance	0	0
Restructured and subsequently defaulted	0	0
Commercial Portfolio Segment | Commercial Investor Real Estate
Financing Receivable, Modifications [Line Items]
Restructured accruing	852	0
Restructured non-accruing	0	0
Balance	852	0
Specific allowance	0	0
Restructured and subsequently defaulted	0	0
Commercial Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable, Modifications [Line Items]
Restructured accruing	0	1,014
Restructured non-accruing	0	0
Balance	0	1,014
Specific allowance	0	204
Restructured and subsequently defaulted	$ 0	$ 0