Deposits - Schedule of Time Deposits Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Banking And Thrift [Abstract]
Within one year	$ 456,259	$ 437,731
After one year through two years	99,597	115,976
After two years through three years	67,773	60,045
After three years through four years	12,897	16,393
After four years through five years	6,130	10,871
Thereafter	4,115	4,711
Total	$ 646,771	$ 645,727
Within one year, Weighted average rate	70.60%	67.80%
After one year through two years, Weighted average rate	15.40%	18.00%
After two years through three years, Weighted average rate	10.50%	9.30%
After three years through four years, Weighted average rate	2.00%	2.50%
After four years through five years, Weighted average rate	0.90%	1.70%
Thereafter, Weighted average rate	0.60%	0.70%
Total, Weighted average rate	100.00%	100.00%