Loans Receivable, Net - Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Non-performing	$ 40,699	$ 45,360
Total loans	1,665,673	1,571,579
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-performing	3,128	4,328
Total loans	201,839	200,683
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	811,558	781,406
Residential Real Estate [Member] | Originated by Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	663,423	638,936
Non-performing	13,669	16,145
Total loans	677,092	655,081
Residential Real Estate [Member] | Originated by Mortgage Company [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	75,383	82,296
Non-performing	10,462	10,589
Total loans	85,845	92,885
Residential Real Estate [Member] | Originated by Mortgage Company - Non-Prime [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	1,347	1,139
Non-performing	1,182	1,479
Total loans	2,529	2,618
Residential Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	46,092	30,821
Total loans	46,092	30,821
Residential Real Estate [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	198,711	196,355
Non-performing	3,128	4,328
Total loans	$ 201,839	$ 200,683