Loans Receivable and Allowance for Loan Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 5,053	$ 2,271
Collectively evaluated for impairment	57,138	59,153
Total	62,191	61,424	$ 61,110	$ 61,734
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2,167	2,086
Collectively evaluated for impairment	28,682	30,008
Total	30,849	32,094	32,886	31,977
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2,796	91
Collectively evaluated for impairment	25,459	25,738
Total	28,255	25,829	23,697	24,381
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	90	94
Collectively evaluated for impairment	2,997	3,407
Total	3,087	3,501	4,277	4,881
Total Portfolio Segments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	5,053	2,271
Collectively evaluated for impairment	57,138	59,153
Total	$ 62,191	$ 61,424	$ 60,860	$ 61,239