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Loans and Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) SecurityLoan | Jun. 30, 2017 USD ($) Property | Jun. 30, 2016 USD ($) SecurityLoan | Dec. 31, 2016 USD ($) Property | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable |  | $ 11,167 |  | $ 10,987 |
Loans and leases receivable |  | $ 4,039,304 |  | $ 3,812,340 |
Number of real estate properties | Property |  | 7 |  | 12 |
Other real estate owned (OREO), net |  | $ 4,321 |  | $ 7,484 |
TDR loans receivable |  | $ 15,900 |  | 18,000 |
Principal and interest due |  | 3 months |  |  |
Reserves relating to loans included in allowance for loan losses |  | $ 3,500 |  | 3,400 |
PCI Loans and Leases [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases receivable | $ 9,572 | $ 8,064 | $ 9,572 | 8,892 | $ 14,573
Central Bancorp, Inc [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of real estate properties | Property |  | 6 |  |  |
Other real estate owned (OREO), net |  | $ 4,200 |  | 5,700 |
Securities Pledged as Collateral [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases receivable |  | 1,000,000 |  | 1,000,000 |
Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable |  | $ 8,300 |  | $ 8,200 |
Commercial term [Member] | Commercial and industrial loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | SecurityLoan | 1 |  | 2 |  |
Recorded Investment | $ 55 |  | $ 85 |  |

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