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Benefit Plans - Additional Information (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2006 | Dec. 31, 2002 | Dec. 31, 2017 USD ($) retirement_payment $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan age attained for coverage |  |  |  | 21 years |  |
Service period for employees of coverage age, years |  |  |  | 1 year |  |
Vesting percentage of participants in pension plan |  |  |  | 100.00% |  |
Expected future employer contributions next year |  |  |  | $ 0 |  |
Requisite service period for deferred compensation arrangement | 10 years | 10 years | 10 years |  |  |
Discount rate |  |  |  | 3.50% |  |
Percentage of matching contribution |  |  |  |  | 25.00% | 25.00%
Percentage of contribution made by the participants in benefit plans |  |  |  |  | 6.00% | 6.00%
Retirement plan for the board of directors to get maximum payments minimum age |  |  |  | 72 years |  |
Number of quarterly payments made to Board of Directors from Retirement Plan | retirement_payment |  |  |  | 40 |  |
Benefit plans compensation expense |  |  |  | $ 1,250 |  |
Period in which undistributed balance of accrued benefit will be distributed |  |  |  | 60 days |  |
Shares purchased under ESOP | shares |  |  |  | 4,769,464 |  |
Average price per share purchased under ESOP (in dollars per share) | $ / shares |  |  |  | $ 17.09 |  |
Outstanding loan principal |  |  |  | $ 41,400,000 |  |
Number of shares released under ESOP | shares |  |  |  | 242,254 | 219,623 |
Unallocated ESOP shares held in suspense | shares |  |  |  | 1,980,536 |  |
Fair market value of ESOP shares |  |  |  | $ 53,400,000 |  |
ESOP compensation expenses |  |  |  | 4,600,000 | $ 3,700,000 | $ 3,000,000
Estimated expense under the supplemental ESOP provision |  |  |  | $ 105,000 | 93,000 | 54,000
Number of shares authorized for issuance under stock award plan | shares |  |  |  | 3,686,510 |  |
Limited number of shares authorized for issuance | shares |  |  |  | 2,100,000 |  |
Unrecognized compensation cost relating go unvested restricted stock |  |  |  | $ 5,700,000 |  |
Weighted average period in which unrecognized compensation cost recognized years |  |  |  | 1 year 11 months 6 days |  |
Fair value of options vesting |  |  |  | $ 168,000 | $ 247,000 | $ 274,000
Projected share based compensation expense, 2018 |  |  |  | 138,000 |  |
Projected share based compensation expense, 2019 |  |  |  | 70,582 |  |
Projected share based compensation expense, 2020 |  |  |  | 10,000 |  |
Aggregate intrinsic value of stock options outstanding |  |  |  | 5,249,000 |  |
Aggregate intrinsic value of stock options exercisable |  |  |  | $ 4,380,000 |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  | $ 4.20 | $ 2.26 | $ 2.52
Retirement Plan for the Board of Directors [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Increase (decrease) in other comprehensive income from retirement plans |  |  |  | $ (1,000) | $ (3,000) | $ 1,800
Restricted Stock [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share based payment award vesting period in years |  |  |  | 3 years |  |
Outstanding Stock Awards [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share based payment award compensation expense |  |  |  | $ 5,000,000 | 3,800,000 | 4,600,000
Stock Options [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share based payment award vesting period in years |  |  |  | 5 years |  |
Share based payment award compensation expense |  |  |  | $ 203,000 | 172,000 | 272,000
Share based payment award expiration period in years |  |  |  | 10 years |  |
Performance Shares [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share based payment award vesting period in years |  |  |  | 3 years |  |
401(k) Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of matching contribution |  |  |  | 25.00% |  |
Percentage of contribution made by the participants in benefit plans |  |  |  | 6.00% |  |
Contribution to the Plan |  |  |  | $ 890,000 | 850,000 | 770,000
Estimated expense of supplemental ESOP provision | $ 14,500 |  |  | 17,500 | 14,500 | 11,500
Supplemental Executive Retirement Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Aggregate contributions to the benefit plan |  |  |  | 91,000 | 96,000 | 93,000
Increase (decrease) in other comprehensive income from retirement plans |  |  |  | (120,000) | (30,000) | (82,000)
Other Liabilities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Retirement plan liabilities | 2,100,000 |  |  | 2,000,000 | 2,100,000 |
Other Liabilities [Member] | Retirement Plan for the Board of Directors [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Retirement plan liabilities | 148,000 |  |  | 142,000 | 148,000 |
Board of Directors [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefit plans compensation expense |  |  |  | 13,000 | 17,500 | 20,000
Pension [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Actuarial gain (loss) during the period |  |  |  | 0 | (70,000) | (78,000)
Defined benefit plan, funded (unfunded) status of plan | $ 13,620,000 |  |  | $ 14,900,000 | $ 13,620,000 | $ 13,174,000
Discount rate | 4.25% |  |  | 3.50% | 4.25% | 4.50%
Contribution to the Plan |  |  |  | $ 0 | $ 0 | $ 0
Post-retirement [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Actuarial gain (loss) during the period |  |  |  | 0 | 0 | (122,000)
Defined benefit plan, funded (unfunded) status of plan | $ (20,805,000) |  |  | $ (22,757,000) | $ (20,805,000) | $ (25,694,000)
Discount rate | 4.25% |  |  | 3.50% | 4.25% | 4.50%
Contribution to the Plan |  |  |  | $ 560,000 | $ 682,000 | $ 644,000
Share-based Compensation Award, Tranche Two [Member] | Outstanding Stock Awards [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share based payment award vesting period in years |  |  |  | 3 years |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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