Business Combination - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Mar. 03, 2014	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash payment price per share	$ 0.40
Shares issued, price per share	$ 2.25
Business Acquisition Purchase Price Allocation Loans Receivable		$ 40,100,000	$ 40,100,000
Business Combination Fair Value Adjustments Loans			1,700,000
Goodwill, Acquired During Period			1,700,000
Other Accrued Liabilities	$ 174,000
Other Liabilities		2,559,000	2,559,000	$ 4,701,000
Contingent Value Right [Member]
Business Acquisition [Line Items]
Other Payments to Acquire Businesses		8,000
Other Liabilities		$ 166,000	$ 166,000
Minimum
Business Acquisition [Line Items]
Payments to acquire businesses, gross	6,200,000
Maximum
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 6,600,000
Core Deposits
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			10 years
Outstanding Prior To August 1, 2013
Business Acquisition [Line Items]
Shares issued, price per share	$ 3.60
BCB Holding Company, Inc
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			$ 200,000