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Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Property | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Property | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable |  | $ 10,552 |  | $ 9,501 |
Loans receivable |  | 3,409,603 |  | $ 3,140,381 |
Transfer of loans receivable to loans held for sale | $ 360 | $ 0 | $ 360 |  |
Number of real estate properties | Property |  | 17 |  | 14 |
Other real estate owned (OREO), net |  | $ 11,846 |  | $ 8,511 |
TDR loans receivable |  | $ 15,800 |  | 17,200 |
Principal and interest due |  | 3 months |  |  |
Reserves relating to loans included in allowance for loan losses |  | $ 400 |  | 1,000 |
PCI Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 32,556 | 9,572 | $ 32,556 | 14,573 | $ 43,475
Outstanding balance of PCI loans - the undiscounted sum of all amounts including amounts deemed principal, interest, fees and penalties |  | 19,100 |  | 30,900 |
Central Bancorp, Inc [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Other real estate owned (OREO), net |  | 6,700 |  | 7,400 |
Securities Pledged as Collateral [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable |  | 758,400 |  | 557,700 |
Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable |  | $ 7,300 |  | $ 7,900 |

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