Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 55,765	$ 70,749
Recorded investment	44,376	56,345
Allowance for loan losses allocated, with an allowance recorded	2,732	3,944
Real estate | One-to-four units
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	1,986	6,904
Recorded investment, with no related allowance recorded	1,484	4,636
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	3,092	8,610
Recorded investment, with an allowance recorded	3,092	8,610
Allowance for loan losses allocated, with an allowance recorded	719	1,678
Real estate | Five or more units
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	2,038	2,946
Recorded investment, with no related allowance recorded	1,819	2,871
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	1,947	966
Recorded investment, with an allowance recorded	1,947	966
Allowance for loan losses allocated, with an allowance recorded	125	161
Real estate | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	10,184	9,105
Recorded investment, with no related allowance recorded	6,423	5,449
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	3,941	1,947
Recorded investment, with an allowance recorded	3,941	1,947
Allowance for loan losses allocated, with an allowance recorded	543	255
Real estate | Church
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	18,664	24,680
Recorded investment, with no related allowance recorded	15,689	20,560
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	9,677	10,934
Recorded investment, with an allowance recorded	9,639	10,934
Allowance for loan losses allocated, with an allowance recorded	1,276	1,683
Real estate | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	279	0
Recorded investment, with no related allowance recorded	273	0
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	0	302
Recorded investment, with an allowance recorded	0	302
Allowance for loan losses allocated, with an allowance recorded	0	97
Commercial | Commercial Other
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	0	285
Recorded investment, with no related allowance recorded	0	0
Allowance for loan losses allocated, with no related allowance recorded	0	0
Unpaid principal balance, with an allowance recorded	69	70
Recorded investment, with an allowance recorded	69	70
Allowance for loan losses allocated, with an allowance recorded	69	70
Commercial | Commercial Sports
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance recorded	3,888	4,000
Recorded investment, with no related allowance recorded	0	0
Allowance for loan losses allocated, with no related allowance recorded	$ 0	$ 0