|
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
|
0 Months Ended |
3 Months Ended |
12 Months Ended |
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Jun. 08, 2012
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Jun. 30, 2012
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Dec. 31, 2013
|
Dec. 31, 2012
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Dec. 31, 2011
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| Schedule of Available-for-sale Securities [Line Items] |
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|
|
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| Owned subsidiary |
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59.20% |
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| Share in Hampshire First Bank |
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|
43.00% |
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|
| Pre-tax gain |
$ 4,800,000 |
$ 4,800,000 |
|
$ 4,819,000 |
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| Cash received from pre-tax gain |
6,600,000 |
|
|
6,600,000 |
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| Shares of NBTB |
547,481 |
|
|
|
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| Proceeds from sale of shares |
11,100,000 |
|
|
|
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| Total revenue |
|
|
10.00% |
|
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| Cash on deposit |
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|
58,200,000 |
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|
| Impairment charges |
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|
0 |
0 |
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| Loans accrual of interest is discontinued at the time the loan |
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|
90 days |
|
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| Maximum loan value ratio |
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|
80.00% |
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| Originate loans with loan-to-value ratios |
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95.00% |
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| First time home buyers, loans with loan-to-value ratios |
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|
100.00% |
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| Period of repayment of loan |
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|
12 months |
24 months |
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| Uncertain tax positions |
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|
0 |
0 |
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| Interest and penalties |
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|
0 |
0 |
0 |
| Interest or penalties |
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|
0 |
0 |
0 |
| Unrecognized prior service cost |
|
|
$ 28,000,000 |
$ 17,000,000 |
|
|
Stock Option [Member]
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|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
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|
|
|
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| Options included in the computation of diluted earnings per share |
|
|
13,971 |
17,500 |
58,600 |