Loans - Loans by Class Modified as Troubled Debt Restructurings with Payment Default (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of loans	13	16
Recorded Investment	$ 2,215	$ 2,540
Permanent Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	6	7
Recorded Investment	1,497	1,526
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	3	4
Recorded Investment	550	576
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1	1
Recorded Investment	460	463
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	2	2
Recorded Investment	487	487
Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1	1
Recorded Investment	488	623
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1	1
Recorded Investment	488	623
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	6	8
Recorded Investment	230	391
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	6	6
Recorded Investment	230	207
Consumer Loans [Member] | Auto [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Consumer Loans [Member] | Marine [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans		2
Recorded Investment		184
Consumer Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Commercial Loans [Member] | Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Recorded Investment