Loans Receivable, Net - Aging of Recorded Investment in Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 8,302	$ 8,348
60-89 Days Past Due	2,649	3,781
Greater than 90 Days Past Due	42,156	39,556
Total Past Due	53,107	51,685
Loans Not Past Due	1,549,169	1,519,894
Total loans	1,602,276	1,571,579
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	785,346	781,406
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	550,808	528,945
Originated by Bank [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	5,158	6,102
60-89 Days Past Due	2,204	2,526
Greater than 90 Days Past Due	13,323	13,800
Total Past Due	20,685	22,428
Loans Not Past Due	634,482	632,653
Total loans	655,167	655,081
Originated by Mortgage Company [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	57	202
60-89 Days Past Due		108
Greater than 90 Days Past Due	10,858	10,031
Total Past Due	10,915	10,341
Loans Not Past Due	78,889	82,544
Total loans	89,804	92,885
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days Past Due	1,505	1,465
Total Past Due	1,505	1,465
Loans Not Past Due	1,018	1,153
Total loans	2,523	2,618
Residential Construction [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		195
60-89 Days Past Due
Greater than 90 Days Past Due
Total Past Due		195
Loans Not Past Due	37,852	30,626
Total loans	37,852	30,821
Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,644	985
60-89 Days Past Due	406	849
Greater than 90 Days Past Due	10,489	9,217
Total Past Due	12,539	11,051
Loans Not Past Due	505,985	491,817
Total loans	518,524	502,868
Construction and Land [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days Past Due	304	309
Total Past Due	304	309
Loans Not Past Due	31,980	25,769
Total loans	32,284	26,078
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,433	864
60-89 Days Past Due	39	298
Greater than 90 Days Past Due	3,650	4,219
Total Past Due	5,122	5,381
Loans Not Past Due	194,804	195,302
Total loans	199,926	200,683
Consumer [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	199,926	200,683
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	10
60-89 Days Past Due
Greater than 90 Days Past Due	2,027	515
Total Past Due	2,037	515
Loans Not Past Due	64,159	60,030
Total loans	$ 66,196	$ 60,545