Monthly Average of Individually Impaired Loans by Class of Loans and Related Interest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 41,131	$ 56,917
Cash Basis Interest Income Recognized	271	527
Real estate | One-to-four units
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,987	13,477
Cash Basis Interest Income Recognized	32	124
Real estate | Five or more units
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,507	3,826
Cash Basis Interest Income Recognized	16	22
Real estate | Commercial real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	9,154	7,476
Cash Basis Interest Income Recognized	81	84
Real estate | Church
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	24,139	31,768
Cash Basis Interest Income Recognized	137	291
Real estate | Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	202	300
Cash Basis Interest Income Recognized	5	5
Commercial | Commercial Other
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	73	0
Cash Basis Interest Income Recognized	0	0
Consumer | Consumer Other
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	69	70
Cash Basis Interest Income Recognized	$ 0	$ 1