Loans by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Loan	Mar. 31, 2012 Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	5	4
Pre-Modification Outstanding Recorded Investment	$ 715	$ 1,242
Post- Modification Outstanding Recorded Investment	765	1,242
Number of Loans	0	1
Pre-Modification Outstanding Recorded Investment	0	100
Real estate | One-to-four units
Financing Receivable, Modifications [Line Items]
Number of Loans	5	0
Pre-Modification Outstanding Recorded Investment	715	0
Post- Modification Outstanding Recorded Investment	765	0
Real estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Pre-Modification Outstanding Recorded Investment	0	229
Post- Modification Outstanding Recorded Investment	0	229
Real estate | Church
Financing Receivable, Modifications [Line Items]
Number of Loans	0	3
Pre-Modification Outstanding Recorded Investment	0	1,013
Post- Modification Outstanding Recorded Investment	0	1,013
Number of Loans	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 100