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Loans and Leases - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Property SecurityLoan | Dec. 31, 2016 USD ($) Property | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable | $ 12,770 | $ 10,987 |
Loans receivable | 4,273,415 | 3,812,340 |
Reclassification from loans receivable to loans held for sale | 0 | 0 | $ 360
Sale of loans held for sale | $ 111,977 | $ 84,901 |
Number of real estate properties | Property | 6 | 12 |
Net carrying value of other real estate property | $ 1,946 | $ 7,484 |
TDR loans receivable | $ 15,400 | 18,000 | 17,200
Principal and interest due | 6 months |  |
Reserves relating to loans included in allowance for loan losses | $ 2,200 | 3,400 | $ 1,000
Number of loans restructured | SecurityLoan | 4 |  |
Serviced loans sold to unaffiliated parties | $ 476,500 | 484,700 |
Central Bancorp, Inc [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net carrying value of other real estate property | 1,800 | 5,700 |
Securities Pledged as Collateral [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | 1,100,000 | 1,000,000 |
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net carrying value of other real estate property | 1,100 |  |
Loans and Finance Receivables [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable | $ 10,200 | $ 8,200 |

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