Regulatory Matters (Schedule Of Adjusted Total Risk Based Capital Ratios) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Beverly Bank
Entity Information [Line Items]
Subordinated debt excluded from Tier Two Capital	$ 13,000	$ 13,000	$ 11,000	$ 11,000	$ 1,000
Total Capital (to Risk Weighted Assets)	9.70%	9.60%	10.10%	10.20%	11.00%
Schaumburg Bank
Entity Information [Line Items]
Subordinated debt excluded from Tier Two Capital	$ 8,500	$ 8,500	$ 3,500	$ 3,500	$ 3,500
Total Capital (to Risk Weighted Assets)	10.20%	10.30%	10.70%	10.80%	10.70%
Barrington Bank
Entity Information [Line Items]
Subordinated debt excluded from Tier Two Capital	$ 5,000	$ 0	$ 0	$ 0	$ 0
Total Capital (to Risk Weighted Assets)	11.40%	11.30%	11.60%	11.40%	11.10%
Old Plank Trail Bank
Entity Information [Line Items]
Subordinated debt excluded from Tier Two Capital	$ 4,000	$ 0	$ 0	$ 0	$ 0
Total Capital (to Risk Weighted Assets)	10.80%	11.30%	11.80%	11.60%	11.90%