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Loans and Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) Property | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable | $ 10,774 | $ 10,987 |  |
Loans and leases receivable | $ 3,910,799 | $ 3,812,340 |  |
Number of real estate properties | Property | 7 | 12 |  |
Other real estate owned (OREO), net | $ 4,636 | $ 7,484 |  |
TDR loans receivable | $ 17,000 | 18,000 |  |
Principal and interest due | 3 months |  |  |
Reserves relating to loans included in allowance for loan losses | $ 3,700 | 3,400 |  |
PCI Loans and Leases [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 8,069 | 8,892 | $ 14,190 | $ 14,573
Central Bancorp, Inc [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Other real estate owned (OREO), net |  | $ 5,700 |  |
Securities Pledged as Collateral [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,000,000 |  |  |
Loans and Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable | $ 8,200 |  |  |

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