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Employee Benefit Plans - Additional Information (Detail) (USD $)
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0 Months Ended |
12 Months Ended |
60 Months Ended |
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Aug. 19, 2008
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Dec. 31, 2013
Age
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2009
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Dec. 31, 2013
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| Employee Benefit Plan [Line Items] |
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| Qualification criteria minimum age |
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18 |
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| Service period |
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3 months |
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| Employer contribution, employee retirement plan |
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3.00% |
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|
|
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| Employee retirement plan, employer matching contribution |
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50.00% |
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|
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| Employee's compensation contribution |
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6.00% |
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| Expense attributable to retirement benefit plan |
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$ 1,300,000 |
$ 1,100,000 |
$ 970,000 |
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| Accrued liability for retirement benefit agreement |
|
4,500,000 |
3,500,000 |
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|
4,500,000 |
| Equity Incentive Plan, issued |
1,035,000 |
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|
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| Restricted stock awards, issued |
414,000 |
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| Restricted stock awards, delivered |
414,000 |
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| Number of common stock repurchased |
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287,652 |
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414,000 |
1,691,580 |
| Common stock repurchased cost |
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|
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3,700,000 |
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| Stock options and restricted shares granted date to employees and directors |
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5 years |
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|
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| Weighted average grant date fair value of options granted |
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289,000 |
77,000 |
208,000 |
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| Aggregate intrinsic value of stock outstanding |
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11,700,000 |
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|
11,700,000 |
| Aggregate intrinsic value of exercisable options |
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10,000,000 |
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|
|
10,000,000 |
| Aggregate intrinsic value of share |
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$ 22.58 |
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|
|
$ 22.58 |
| Compensation expense related to Share-Based Compensation Plan |
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1,200,000 |
1,200,000 |
1,100,000 |
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| Tax benefit related to Share-Based Compensation Plan |
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325,000 |
309,000 |
288,000 |
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| Proceeds on loan from the Company's subsidiary, Meridian Interstate Funding Corporation |
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8,300,000 |
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|
|
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| Maturity period of loan |
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20 years |
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|
|
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| Loan payable rate |
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6.50% |
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6.50% |
| Fair value of the unallocated shares |
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13,100,000 |
10,400,000 |
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|
13,100,000 |
| Compensation expense recognized in connection with the ESOP |
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814,000 |
606,000 |
532,000 |
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| Post-retirement benefit expenses |
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567,000 |
388,000 |
241,000 |
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| Incentive compensation plan expense |
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3,300,000 |
3,100,000 |
1,900,000 |
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Subsidiaries [Member]
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| Employee Benefit Plan [Line Items] |
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| Number of shares ESOP acquired |
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828,000 |
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Supplemental Executive Retirement Benefits [Member]
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| Employee Benefit Plan [Line Items] |
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| Expected future benefit payments for the plan 2015 |
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833,000 |
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|
833,000 |
| Expected future benefit payments for the plan 2019 through 2023 |
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561,000 |
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|
|
561,000 |
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Restricted Stock [Member]
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| Employee Benefit Plan [Line Items] |
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| Restricted stock awards |
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35,520 |
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|
|
35,520 |
| Fair value of restricted shares vested, total |
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1,400,000 |
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| Unrecognized compensation expense related to non-vested options under the plan |
|
2,000,000 |
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|
2,000,000 |
| Cost expected to recognize weighted-average period |
|
3 years 3 months 18 days |
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Stock Option [Member]
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| Employee Benefit Plan [Line Items] |
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| Restricted stock awards |
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62,450 |
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62,450 |
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2008 Equity Incentive Plan [Member]
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| Employee Benefit Plan [Line Items] |
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| Equity Incentive Plan award, delivered |
1,449,000 |
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Officer and Director [Member]
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| Employee Benefit Plan [Line Items] |
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| Supplemental executive retirement benefit expense for officers and directors |
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$ 1,200,000 |
$ 1,000,000 |
$ 791,000 |
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