Loans Receivable, Net - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with non-accrual of interest		$ 18,274,000	$ 18,307,000	$ 45,400,000
Financing receivables 90 days past due and still accruing		0
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans		250,000
Impaired loan portfolio total		38,372,000	36,979,000
Allocation in allowance for loan losses		1,339,000	2,161,000
Average balance of impaired loans		41,500,000	41,000,000	38,600,000
Interest income on non-accrual loans		848,000	1,600,000	2,500,000
Commitments to lend additional funds to borrowers		0
Troubled debt restructuring loans		31,300,000	23,500,000
Troubled debt restructuring loans with accrual interest		26,300,000	21,500,000
Non-accrual loan total troubled debt restructurings		4,900,000	2,000,000	9,700,000
Specific reserves to loans accruing troubled debt restructurings		262,000	419,000	$ 1,800,000
Allowance for loan losses		0
Colonial American Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with non-accrual of interest		5,779,000	3,115,000
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		2,000,000
Foreclosed property held		1,800,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with non-accrual of interest		$ 10,796,000	$ 12,758,000
Loans classified as troubled debt restructurings					$ 3,900,000