Loans by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Loan	Dec. 31, 2011 Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	28	23
Pre-Modification Outstanding Recorded Investment	$ 13,871	$ 17,486
Post-Modification Outstanding Recorded Investment	14,305	16,955
Number of Loans	4	1
Pre-Modification Outstanding Recorded Investment	3,211	418
Real estate | One-to-four units
Financing Receivable, Modifications [Line Items]
Number of Loans	2	9
Pre-Modification Outstanding Recorded Investment	115	7,711
Post-Modification Outstanding Recorded Investment	115	7,745
Real estate | Five or more units
Financing Receivable, Modifications [Line Items]
Number of Loans	6	1
Pre-Modification Outstanding Recorded Investment	2,205	494
Post-Modification Outstanding Recorded Investment	2,351	459
Real estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans	6	0
Pre-Modification Outstanding Recorded Investment	4,515	0
Post-Modification Outstanding Recorded Investment	4,716	0
Number of Loans	0	1
Pre-Modification Outstanding Recorded Investment	0	418
Real estate | Church
Financing Receivable, Modifications [Line Items]
Number of Loans	13	12
Pre-Modification Outstanding Recorded Investment	7,036	9,211
Post-Modification Outstanding Recorded Investment	7,123	8,681
Number of Loans	4	0
Pre-Modification Outstanding Recorded Investment	3,211	0
Commercial | Commercial Other
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Pre-Modification Outstanding Recorded Investment	0	70
Post-Modification Outstanding Recorded Investment	$ 0	$ 70