Loans - Presentation of Recorded Investment in Nonaccrual Loans and Loans Past Due Over 90 Days and Still on Accrual by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	$ 22,984	$ 23,543
Financing receivable, recorded investment, Loans past due over 90 days and still accruing		45
Permanent Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	12,856	13,053
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	6,133	6,356
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	1,158	641
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	5,033	5,560
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	532	496
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	2,884	3,084
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	2,884	3,084
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	3,089	3,248
Financing receivable, recorded investment, Loans past due over 90 days and still accruing		45
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	2,724	2,726
Financing receivable, recorded investment, Loans past due over 90 days and still accruing		45
Consumer Loans [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	80	110
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Consumer Loans [Member] | Marine [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	130	136
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	147	263
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Consumer Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	8	13
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	4,155	4,158
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Commercial Loans [Member] | Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	4,026	4,028
Financing receivable, recorded investment, Loans past due over 90 days and still accruing
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, recorded investment, Nonaccrual	129	130
Financing receivable, recorded investment, Loans past due over 90 days and still accruing