Loans Receivable, Net - Summary of Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	$ 37,099		$ 37,099		$ 37,546
Allowance for Loan Losses Allocated	3,436		3,436		2,554
With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	27,167		27,167		26,196
Recorded Investment	25,312		25,312		25,513
Allowance for Loan Losses Allocated
Average Recorded Investment	25,778	18,727	26,074	18,496
Interest Income Recognized	206	188	421	377
With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	11,978		11,978		12,121
Recorded Investment	11,787		11,787		12,033
Allowance for Loan Losses Allocated	3,436		3,436		2,554
Average Recorded Investment	11,771	10,642	12,154	10,347
Interest Income Recognized	105	106	222	232
Originated by Bank [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	11,586		11,586		11,200
Recorded Investment	11,052		11,052		10,956
Allowance for Loan Losses Allocated
Average Recorded Investment	10,983	8,653	11,276	8,606
Interest Income Recognized	86	96	176	198
Originated by Bank [Member] | Residential Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	824		824		1,761
Recorded Investment	824		824		1,755
Allowance for Loan Losses Allocated	127		127		142
Average Recorded Investment	824	1,055	826	920
Interest Income Recognized	11	6	21	46
Originated by Mortgage Company [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	6,526		6,526		7,210
Recorded Investment	6,160		6,160		7,061
Allowance for Loan Losses Allocated
Average Recorded Investment	6,774	5,079	6,761	5,083
Interest Income Recognized	57	55	127	109
Originated by Mortgage Company [Member] | Residential Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	791		791		404
Recorded Investment	774		774		404
Allowance for Loan Losses Allocated	67		67		37
Average Recorded Investment	776		779
Interest Income Recognized	9		20
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	2,774		2,774		2,335
Recorded Investment	2,190		2,190		2,251
Allowance for Loan Losses Allocated
Average Recorded Investment	2,194	2,256	2,221	2,175
Interest Income Recognized	5	1	8	2
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance
Recorded Investment
Allowance for Loan Losses Allocated
Average Recorded Investment		401		400
Commercial [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	284		284		291
Recorded Investment	284		284		291
Allowance for Loan Losses Allocated
Average Recorded Investment	286	295	287	296
Interest Income Recognized	3	3	5	4
Commercial [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance
Recorded Investment
Allowance for Loan Losses Allocated
Average Recorded Investment
Interest Income Recognized
Commercial [Member] | Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	3,001		3,001		2,722
Recorded Investment	2,977		2,977		2,691
Allowance for Loan Losses Allocated
Average Recorded Investment	2,749	1,730	2,699	1,614
Interest Income Recognized	34	24	65	45
Commercial [Member] | Commercial Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	9,100		9,100		9,022
Recorded Investment	8,926		8,926		8,943
Allowance for Loan Losses Allocated	2,555		2,555		1,834
Average Recorded Investment	8,908	9,055	9,250	8,896
Interest Income Recognized	76	99	157	184
Construction and Land [Member] | Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance					482
Recorded Investment					482
Allowance for Loan Losses Allocated
Average Recorded Investment
Interest Income Recognized
Construction and Land [Member] | Commercial Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	472		472
Recorded Investment	472		472
Allowance for Loan Losses Allocated	202		202
Average Recorded Investment	472		472
Consumer [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	2,996		2,996		1,956
Recorded Investment	2,649		2,649		1,781
Allowance for Loan Losses Allocated
Average Recorded Investment	2,792	714	2,830	722
Interest Income Recognized	21	9	40	19
Consumer [Member] | With an Allowance Recorded [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance	791		791		934
Recorded Investment	791		791		931
Allowance for Loan Losses Allocated	485		485		541
Average Recorded Investment	791	131	827	131
Interest Income Recognized	$ 9	$ 1	$ 24	$ 2