Loans Receivable, Net - Recorded Investment in Non-Accrual Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	$ 45,900	$ 43,374
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	396	746
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	5,195	4,540
Residential Real Estate [Member] | Originated by Bank [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	14,858	13,156
Residential Real Estate [Member] | Originated by Mortgage Company [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	10,813	10,477
Residential Real Estate [Member] | Originated by Mortgage Company - Non-Prime [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	2,774	2,888
Commercial Real Estate [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	11,392	11,085
Commercial Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	$ 472	$ 482