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Acquisition - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2014 USD ($) branch $ / shares | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Loans At Acquisition Date [Line Items] |  |  |  |  |  |  |
Merger and integration expense |  | $ 136 |  | $ 72 | $ 1,747 | $ 157 |
Amortization of subordinated debentures |  | 41 |  |  | 79 |  |
Central Bancorp, Inc [Member] |  |  |  |  |  |  |
Loans At Acquisition Date [Line Items] |  |  |  |  |  |  |
Common stock, price per share after acquisition | $ / shares | $ 17.64 |  |  |  |  |  |
Consideration paid | $ 50,000 |  |  |  |  |  |
Consideration paid for redemption of preferred stock and cumulative unpaid dividends | 28,675 |  |  |  |  |  |
Total assets acquired | 1,267,921 |  |  |  |  |  |
Total liabilities assumed | 1,174,669 |  |  |  |  |  |
Total identifiable net assets | 93,252 |  |  |  |  |  |
Loans | 297,272 |  |  |  |  |  |
Total deposits | $ 1,098,997 |  |  |  |  |  |
Number of branch locations | branch | 23 |  |  |  |  |  |
Bargain purchase gain, net of deferred taxes | $ 14,577 |  |  |  |  |  |
Merger and integration expense |  | 136 |  |  | 1,700 |  | $ 6,600
Core deposit intangible | $ 2,213 |  |  |  |  |  |
Core deposit intangible, useful life | 10 years |  |  |  |  |  |
Amortization expense of core deposit intangible |  | 95 |  |  | 190 |  |
Certificates of deposit | $ 11,300 |  |  |  |  |  |
Amortization of certificates of deposit |  | 1,500 |  |  | 3,100 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Gain Recognized, Amount |  |  | $ 8,000 |  |  |  |
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |  |
Loans At Acquisition Date [Line Items] |  |  |  |  |  |  |
Discount on subordinated debentures | $ 8,300 |  | $ 8,300 |  |  |  |
Amortization of subordinated debentures |  | $ 41 |  |  | $ 79 |  |

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