Loans Receivable, Net - Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Non-performing	$ 45,321	$ 45,360
Total loans	1,602,276	1,571,579
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-performing	3,731	4,328
Total loans	199,926	200,683
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	785,346	781,406
Residential Real Estate [Member] | Originated by Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	640,725	638,936
Non-performing	14,442	16,145
Total loans	655,167	655,081
Residential Real Estate [Member] | Originated by Mortgage Company [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	78,172	82,296
Non-performing	11,632	10,589
Total loans	89,804	92,885
Residential Real Estate [Member] | Originated by Mortgage Company - Non-Prime [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	1,111	1,139
Non-performing	1,412	1,479
Total loans	2,523	2,618
Residential Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	37,852	30,821
Non-performing
Total loans	37,852	30,821
Residential Real Estate [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	196,195	196,355
Non-performing	3,731	4,328
Total loans	$ 199,926	$ 200,683