Borrowed Funds - Summary of Borrowed Funds (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Due within 12 months, Weighted average rate	1.95%	2.12%
Due beyond 12 months but within 2 years, Weighted average rate	0.95%	2.14%
Due beyond 2 years but within 3 years, Weighted average rate	1.11%	0.99%
Due beyond 3 years but within 4 years, Weighted average rate	1.60%	1.34%
Due beyond 4 years but within 5 years, Weighted average rate	3.21%	3.26%
Due within 12 months	$ 57,180	$ 101,492
Due beyond 12 months but within 2 years	60,075	25,873
Due beyond 2 years but within 3 years	85,466	78,008
Due beyond 3 years but within 4 years	44,375	73,380
Due beyond 4 years but within 5 years	12,628	12,168
Total	259,724	290,921
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Due within 12 months, Weighted average rate	2.24%	2.34%
Due beyond 12 months but within 2 years, Weighted average rate		4.12%
Due beyond 2 years but within 3 years, Weighted average rate	4.28%
Due beyond 3 years but within 4 years, Weighted average rate	3.90%	4.28%
Due beyond 4 years but within 5 years, Weighted average rate	4.66%	4.49%
Due within 12 months	38,000	58,000
Due beyond 12 months but within 2 years		10,000
Due beyond 2 years but within 3 years	25,000
Due beyond 3 years but within 4 years	10,000	25,000
Due beyond 4 years but within 5 years	35,000	45,000
Total	108,000	138,000
ESOP Borrowings [Member]
Debt Instrument [Line Items]
Due within 12 months, Weighted average rate	4.68%	4.68%
Due beyond 12 months but within 2 years, Weighted average rate	4.68%	4.68%
Due beyond 2 years but within 3 years, Weighted average rate		4.68%
Due within 12 months	1,000	1,000
Due beyond 12 months but within 2 years	750	1,000
Due beyond 2 years but within 3 years		250
Total	1,750	2,250
Corporate Borrowings [Member]
Debt Instrument [Line Items]
Due within 12 months, Weighted average rate	3.75%	3.75%
Due beyond 12 months but within 2 years, Weighted average rate	3.75%	3.75%
Due beyond 2 years but within 3 years, Weighted average rate	3.75%	3.75%
Due beyond 3 years but within 4 years, Weighted average rate	3.75%	3.75%
Due beyond 4 years but within 5 years, Weighted average rate		3.75%
Due within 12 months	1,000	1,000
Due beyond 12 months but within 2 years	1,000	1,000
Due beyond 2 years but within 3 years	1,000	1,000
Due beyond 3 years but within 4 years	5,972	1,000
Due beyond 4 years but within 5 years		5,973
Total	8,972	9,973
Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Due beyond 5 years, Weighted average rate	2.04%	2.06%
Due beyond 5 years	$ 36,083	$ 36,083