| **Income Taxes (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------|----------------|-----------------|
||
| **Federal income tax**                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Current                                                                    |           |            |   |   |   |   |   |   | $ 3,234 | $ 3,239 | $ 2,828 |
| Deferred                                                                   |           |            |   |   |   |   |   |   | (56) | (108) | 730 |
| Federal income tax expense                                                 |           |            |   |   |   |   |   |   | 3,178 | 3,131 | 3,558 |
| **State income tax [Abstract]**                                            |           |            |   |   |   |   |   |   |   |   |   |
| State franchise tax                                                        |           |            |   |   |   |   |   |   | 247 | 240 | 233 |
| Income tax expense                                                         | 939            | 683             | 955 | 825 | 706 | 944 | 961 | 783 | 3,425 | 3,371 | 3,791 |
| **Reconciliation between US expected tax rate and actual tax expense**     |           |            |   |   |   |   |   |   |   |   |   |
| Expected tax expense                                                       |           |            |   |   |   |   |   |   | 5,736 | 5,621 | 5,654 |
| Non-taxable income                                                         |           |            |   |   |   |   |   |   | (2,326) | (2,096) | (1,794) |
| State franchise tax, net of federal tax benefit                            |           |            |   |   |   |   |   |   | 160 | 156 | 152 |
| Tax credits                                                                |           |            |   |   |   |   |   |   | (414) | (414) | (383) |
| Other                                                                      |           |            |   |   |   |   |   |   | 269 | 104 | 162 |
| Income tax expense                                                         | 939            | 683             | 955 | 825 | 706 | 944 | 961 | 783 | 3,425 | 3,371 | 3,791 |
| **Components of deferred tax assets and liabilities**                      |           |            |   |   |   |   |   |   |   |   |   |
| Allowance for loan losses                                                  | 4,030          | 4,375           |   |   |   |   |   |   | 4,030 | 4,375 |   |
| OREO                                                                       | 116            | 131             |   |   |   |   |   |   | 116 | 131 |   |
| Accrued pension and post-retirement                                        | 1,334          | 1,412           |   |   |   |   |   |   | 1,334 | 1,412 |   |
| Unrealized loss on securities available for sale                           | 3,549          | 0               |   |   |   |   |   |   | 3,549 | 0 |   |
| Goodwill                                                                   | 206            | 0               |   |   |   |   |   |   | 206 | 0 |   |
| Tax credits, carried forward                                               | 539            | 103             |   |   |   |   |   |   | 539 | 103 |   |
| Other assets                                                               | 163            | 89              |   |   |   |   |   |   | 163 | 89 |   |
| Total deferred tax asset                                                   | 9,937          | 6,110           |   |   |   |   |   |   | 9,937 | 6,110 |   |
| Net deferred loan costs                                                    | (884)          | (770)           |   |   |   |   |   |   | (884) | (770) |   |
| Depreciation                                                               | (2,672)        | (2,326)         |   |   |   |   |   |   | (2,672) | (2,326) |   |
| Unrealized gain on securities available for sale                           | 0              | (4,275)         |   |   |   |   |   |   | 0 | (4,275) |   |
| Mortgage servicing rights                                                  | (405)          | (303)           |   |   |   |   |   |   | (405) | (303) |   |
| Core deposit intangible                                                    | (99)           | (203)           |   |   |   |   |   |   | (99) | (203) |   |
| Investment in flow through entities                                        | (361)          | (323)           |   |   |   |   |   |   | (361) | (323) |   |
| Prepaid expense                                                            | (316)          | (422)           |   |   |   |   |   |   | (316) | (422) |   |
| Total deferred tax liability                                               | (4,737)        | (8,622)         |   |   |   |   |   |   | (4,737) | (8,622) |   |
| Net deferred tax asset (liability)                                         | 5,200          | (2,512)         |   |   |   |   |   |   | 5,200 | (2,512) |   |
| **Limited partnerships**                                                   |           |            |   |   |   |   |   |   |   |   |   |
| Limited partnerships held as investments                                   | 2              |            |   |   |   |   |   |   | 2 |   |   |
| Tax credits from investments in limited partnerships                       |           |            |   |   |   |   |   |   | 636 | 636 |   |
| Amortization of investments in limited partnerships                        |           |            |   |   |   |   |   |   | 520 | 476 |   |
| Carrying value of investments in limited partnerships                      | 1,026          | 1,546           |   |   |   |   |   |   | 1,026 | 1,546 |   |
| Total exposure to limited partnerships                                     | $ 4,526        | $ 5,046         |   |   |   |   |   |   | $ 4,526 | $ 5,046 |   |

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from temporary differences related to other real estate owned which can only be deducted for tax purposes when the losses are realized.
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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from post-retirement benefits and pension costs, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.
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Deferred tax on prepaid expense.
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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions, before any related valuation allowance, arising from unrealized losses on available-for-sale securities which can only be deducted for tax purposes when the losses are realized, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.
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Amount related to deferred tax from investment in flow through entities.
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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Limited Partnership (LP).
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The number of limited partnerships held as investments at period end.
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| - Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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| - Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from financing arrangements.
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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.
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Amount of deferred tax liability attributable to taxable temporary differences from mortgage servicing rights.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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| - Definition
Amount of current and deferred income tax expense (benefit) attributable to income (loss) from continuing domestic operations within the country of domicile of the entity.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible amortization.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).
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The amount of the limited partners' ownership interests.
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Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.
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