Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 44,541	$ 55,765
Recorded investment	34,674	44,376
Allowance for loan losses allocated, with an allowance recorded	2,171	2,732
Real estate | One-to-four units
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	1,989	1,986
Recorded investment, with no related allowance recorded	1,444	1,484
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	2,316	3,092
Recorded investment, with an allowance recorded	2,316	3,092
Allowance for loan losses allocated, with an allowance recorded	587	719
Real estate | Five or more units
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	2,049	2,038
Recorded investment, with no related allowance recorded	2,049	1,819
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	333	1,947
Recorded investment, with an allowance recorded	333	1,947
Allowance for loan losses allocated, with an allowance recorded	26	125
Real estate | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	8,080	10,184
Recorded investment, with no related allowance recorded	4,765	6,423
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	1,371	3,941
Recorded investment, with an allowance recorded	1,371	3,941
Allowance for loan losses allocated, with an allowance recorded	59	543
Real estate | Church
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	14,717	18,664
Recorded investment, with no related allowance recorded	12,598	15,689
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	9,632	9,677
Recorded investment, with an allowance recorded	9,632	9,639
Allowance for loan losses allocated, with an allowance recorded	1,333	1,276
Real estate | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	0	279
Recorded investment, with no related allowance recorded	0	273
Allowance for loan losses allocated, with no related allowance recorded	0	0
Commercial | Commercial Other
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with an allowance recorded	97	0
Recorded investment, with an allowance recorded	97	0
Allowance for loan losses allocated, with an allowance recorded	97	0
Commercial | Commercial Sports
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	3,888	3,888
Recorded investment, with no related allowance recorded	0	0
Allowance for loan losses allocated, with no related allowance recorded	0	0
Consumer | Consumer Other
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with an allowance recorded	69	69
Recorded investment, with an allowance recorded	69	69
Allowance for loan losses allocated, with an allowance recorded	$ 69	$ 69