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Investment Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Securities	Dec. 31, 2012 Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position	219	57
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio	5.06%	2.78%
Carrying value of securities pledged	$ 284,770,000	$ 292,880,000
OTTI charges incurred	$ 320,000	$ 942,000
Reduced severity rate	10.00%
Severity rate reduction period	3 years
Continuous Loss Position More Than Twelve Months
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position	32
Mortgage-backed securities Non-Agency Alt-A residential
Schedule of Available-for-sale Securities [Line Items]
Voluntary constant prepayment rate	2.00%
Constant default rate scenario	16.00%
Severity rate	55.00%