Loans Receivable, Net - Aging of Recorded Investment in Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 12,910	$ 12,305
60-89 Days Past Due	5,112	2,020
Greater than 90 Days Past Due	34,898	31,201
Total Past Due	52,920	45,526
Loans Not Past Due	1,473,666	1,497,711
Total loans	1,526,586	1,543,237
Originated by Bank [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	7,308	5,863
60-89 Days Past Due	3,188	782
Greater than 90 Days Past Due	14,293	10,624
Total Past Due	24,789	17,269
Loans Not Past Due	642,920	666,833
Total loans	667,709	684,102
Originated by Mortgage Company [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	773	2,870
60-89 Days Past Due	563	7
Greater than 90 Days Past Due	10,233	10,294
Total Past Due	11,569	13,171
Loans Not Past Due	93,490	101,437
Total loans	105,059	114,608
Originated by Mortgage Company - Non-Prime [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	368	431
60-89 Days Past Due	329	47
Greater than 90 Days Past Due	2,322	2,369
Total Past Due	3,019	2,847
Loans Not Past Due	1,071	1,402
Total loans	4,090	4,249
Residential Construction [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
Total Past Due
Loans Not Past Due	12,879	9,013
Total loans	12,879	9,013
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,000
60-89 Days Past Due	515
Greater than 90 Days Past Due	113	112
Total Past Due	1,628	112
Loans Not Past Due	65,296	57,855
Total loans	66,924	57,967
Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,675	2,422
60-89 Days Past Due	135	608
Greater than 90 Days Past Due	2,626	2,863
Total Past Due	5,436	5,893
Loans Not Past Due	456,595	457,394
Total loans	462,031	463,287
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	472	482
Total Past Due	472	482
Loans Not Past Due	15,097	11,386
Total loans	15,569	11,868
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	786	719
60-89 Days Past Due	382	576
Greater than 90 Days Past Due	4,839	4,457
Total Past Due	6,007	5,752
Loans Not Past Due	186,318	192,391
Total loans	$ 192,325	$ 198,143