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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 42,382		$ 42,382		$ 39,903
Allowance for Loan Losses Allocated	4,069		4,069		3,647
With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	29,759		29,759		26,404
Recorded Investment	27,588		27,588		24,457
Average Recorded Investment	28,170	25,778	27,572	26,074
Interest Income Recognized	212	206	433	421
With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	14,813		14,813		15,532
Recorded Investment	14,794		14,794		15,446
Allowance for Loan Losses Allocated	4,069		4,069		3,647
Average Recorded Investment	14,665	11,771	14,830	12,154
Interest Income Recognized	52	105	115	222
Originated by Bank [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9,591		9,591		10,537
Recorded Investment	8,819		8,819		9,885
Average Recorded Investment	9,049	10,983	9,141	11,276
Interest Income Recognized	101	86	184	176
Originated by Bank [Member] | Residential Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	862		862		62
Recorded Investment	862		862		62
Allowance for Loan Losses Allocated	106		106		2
Average Recorded Investment	865	824	869	826
Interest Income Recognized	8	11	18	21
Originated by Mortgage Company [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,952		7,952		7,762
Recorded Investment	7,567		7,567		7,387
Average Recorded Investment	7,555	6,774	7,486	6,761
Interest Income Recognized	65	57	127	127
Originated by Mortgage Company [Member] | Residential Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	393		393
Recorded Investment	393		393
Allowance for Loan Losses Allocated	25		25
Average Recorded Investment	394	776	395	779
Interest Income Recognized	7	9	13	20
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,616		1,616		1,260
Recorded Investment	1,215		1,215		858
Average Recorded Investment	1,103	2,194	981	2,221
Interest Income Recognized	3	5	6	8
Commercial [Member] | Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8,093		8,093		2,303
Recorded Investment	8,009		8,009		2,292
Average Recorded Investment	8,046	2,749	7,526	2,699
Interest Income Recognized	20	34	70	65
Commercial [Member] | Commercial Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	12,591		12,591		15,128
Recorded Investment	12,572		12,572		15,042
Allowance for Loan Losses Allocated	3,417		3,417		3,389
Average Recorded Investment	12,417	8,908	12,584	9,250
Interest Income Recognized	26	76	63	157
Construction and Land [Member] | Commercial Real Estate [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	304		304		309
Recorded Investment	304		304		309
Allowance for Loan Losses Allocated	76		76		223
Average Recorded Investment	304	472	304	472
Consumer [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,231		2,231		3,435
Recorded Investment	1,702		1,702		2,928
Average Recorded Investment	2,141	2,792	2,161	2,830
Interest Income Recognized	20	21	41	40
Consumer [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	663		663		33
Recorded Investment	663		663		33
Allowance for Loan Losses Allocated	445		445		33
Average Recorded Investment	685	791	678	827
Interest Income Recognized	11	9	21	24
Commercial and Industrial [Member] | With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	276		276		1,107
Recorded Investment	276		276		1,107
Average Recorded Investment	276	286	277	287
Interest Income Recognized	$ 3	$ 3	$ 5	$ 5