Loans Receivable, Net - Aging of Recorded Investment in Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 8,866	$ 8,348
60-89 Days Past Due	2,032	3,781
Greater than 90 Days Past Due	37,996	39,556
Total Past Due	48,894	51,685
Loans Not Past Due	1,616,779	1,519,894
Total loans	1,665,673	1,571,579
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	811,558	781,406
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	577,061	528,945
Originated by Bank [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	7,851	6,102
60-89 Days Past Due	1,528	2,526
Greater than 90 Days Past Due	11,628	13,800
Total Past Due	21,007	22,428
Loans Not Past Due	656,085	632,653
Total loans	677,092	655,081
Originated by Mortgage Company [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	90	202
60-89 Days Past Due	0	108
Greater than 90 Days Past Due	9,796	10,031
Total Past Due	9,886	10,341
Loans Not Past Due	75,959	82,544
Total loans	85,845	92,885
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days Past Due	1,242	1,465
Total Past Due	1,242	1,465
Loans Not Past Due	1,287	1,153
Total loans	2,529	2,618
Residential Construction [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	195
Total Past Due	0	195
Loans Not Past Due	46,092	30,626
Total loans	46,092	30,821
Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	483	985
60-89 Days Past Due	0	849
Greater than 90 Days Past Due	11,790	9,217
Total Past Due	12,273	11,051
Loans Not Past Due	526,811	491,817
Total loans	539,084	502,868
Construction and Land [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days Past Due	304	309
Total Past Due	304	309
Loans Not Past Due	37,673	25,769
Total loans	37,977	26,078
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	442	864
60-89 Days Past Due	504	298
Greater than 90 Days Past Due	3,072	4,219
Total Past Due	4,018	5,381
Loans Not Past Due	197,821	195,302
Total loans	201,839	200,683
Consumer [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	201,839	200,683
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days Past Due	164	515
Total Past Due	164	515
Loans Not Past Due	75,051	60,030
Total loans	$ 75,215	$ 60,545