| **Income Taxes (Details)**                                                            | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Federal income tax**                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Current                                                                               |           |            |   |   |   |   |   |   | $ 6,276,000 | $ 4,895,000 | $ 4,282,000 |
| Deferred                                                                              |           |            |   |   |   |   |   |   | (139,000) | 332,000 | 18,000 |
| Federal income tax expense                                                            |           |            |   |   |   |   |   |   | 6,137,000 | 5,227,000 | 4,300,000 |
| **State income tax [Abstract]**                                                       |           |            |   |   |   |   |   |   |   |   |   |
| State franchise tax                                                                   |           |            |   |   |   |   |   |   | 317,000 | 287,000 | 266,000 |
| Income tax expense                                                                    | $ 1,470,000    | $ 1,656,000     | $ 1,713,000 | $ 1,615,000 | $ 1,245,000 | $ 1,391,000 | $ 1,458,000 | $ 1,420,000 | 6,454,000 | 5,514,000 | 4,566,000 |
| **Reconciliation between US expected tax rate and actual tax expense**                |           |            |   |   |   |   |   |   |   |   |   |
| Expected tax expense                                                                  |           |            |   |   |   |   |   |   | 8,562,000 | 7,602,000 | 6,746,000 |
| Non-taxable income                                                                    |           |            |   |   |   |   |   |   | (2,176,000) | (2,086,000) | (2,292,000) |
| State franchise tax, net of federal tax benefit                                       |           |            |   |   |   |   |   |   | 206,000 | 187,000 | 173,000 |
| Tax credits, net of amortization                                                      |           |            |   |   |   |   |   |   | (105,000) | (185,000) | (414,000) |
| Other                                                                                 |           |            |   |   |   |   |   |   | (33,000) | (4,000) | 353,000 |
| Income tax expense                                                                    | 1,470,000      | $ 1,656,000     | $ 1,713,000 | $ 1,615,000 | 1,245,000 | $ 1,391,000 | $ 1,458,000 | $ 1,420,000 | 6,454,000 | 5,514,000 | $ 4,566,000 |
| **Components of deferred tax assets and liabilities**                                 |           |            |   |   |   |   |   |   |   |   |   |
| Allowance for loan losses                                                             | 3,548,000      |            |   |   | 3,471,000 |   |   |   | 3,548,000 | 3,471,000 |   |
| OREO                                                                                  | 72,000         |            |   |   | 57,000 |   |   |   | 72,000 | 57,000 |   |
| Accrued pension and post-retirement                                                   | 1,730,000      |            |   |   | 1,769,000 |   |   |   | 1,730,000 | 1,769,000 |   |
| Goodwill                                                                              | 2,000          |            |   |   | 70,000 |   |   |   | 2,000 | 70,000 |   |
| Unrealized loss on securities transferred from available for sale to held to maturity | 70,000         |            |   |   | 60,000 |   |   |   | 70,000 | 60,000 |   |
| Unrealized loss on securities available for sale                                      | 503,000        |            |   |   | 0 |   |   |   | 503,000 | 0 |   |
| Restricted stock grants                                                               | 237,000        |            |   |   | 367,000 |   |   |   | 237,000 | 367,000 |   |
| Core deposit intangible                                                               | 20,000         |            |   |   | 15,000 |   |   |   | 20,000 | 15,000 |   |
| Investment in flow through entities                                                   | 29,000         |            |   |   | 0 |   |   |   | 29,000 | 0 |   |
| Other assets                                                                          | 48,000         |            |   |   | 93,000 |   |   |   | 48,000 | 93,000 |   |
| Total deferred tax asset                                                              | 6,259,000      |            |   |   | 5,902,000 |   |   |   | 6,259,000 | 5,902,000 |   |
| Net deferred loan costs                                                               | (1,895,000)    |            |   |   | (1,445,000) |   |   |   | (1,895,000) | (1,445,000) |   |
| Depreciation                                                                          | (1,808,000)    |            |   |   | (2,000,000) |   |   |   | (1,808,000) | (2,000,000) |   |
| Unrealized gain on securities available for sale                                      | 0              |            |   |   | (605,000) |   |   |   | 0 | (605,000) |   |
| Mortgage servicing rights                                                             | (390,000)      |            |   |   | (382,000) |   |   |   | (390,000) | (382,000) |   |
| Unrealized gain on derivative instruments                                             | (626,000)      |            |   |   | 0 |   |   |   | (626,000) | 0 |   |
| Investment in flow through entities                                                   | 0              |            |   |   | (425,000) |   |   |   | 0 | (425,000) |   |
| Prepaid expense                                                                       | 0              |            |   |   | (104,000) |   |   |   | 0 | (104,000) |   |
| Total deferred tax liability                                                          | (4,719,000)    |            |   |   | (4,961,000) |   |   |   | (4,719,000) | (4,961,000) |   |
| Net deferred tax asset                                                                | $ 1,540,000    |            |   |   | $ 941,000 |   |   |   | $ 1,540,000 | $ 941,000 |   |
| **Limited partnerships**                                                              |           |            |   |   |   |   |   |   |   |   |   |
| Limited partnerships held as investments | limited_partnership                        | 2              |            |   |   | 2 |   |   |   | 2 | 2 |   |
| Tax credits from investments in limited partnerships                                  |           |            |   |   |   |   |   |   | $ 231,000 | $ 244,000 |   |
| Amortization of investments in limited partnerships                                   |           |            |   |   |   |   |   |   | 194,000 | 201,000 |   |
| Carrying value of investments in limited partnerships                                 | $ 1,503,000    |            |   |   | $ 1,739,000 |   |   |   | 1,503,000 | 1,739,000 |   |
| Total exposure to limited partnerships                                                | $ 1,503,000    |            |   |   | $ 1,739,000 |   |   |   | $ 1,503,000 | $ 1,739,000 |   |

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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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The number of limited partnerships held as investments at period end.
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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.
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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 and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.
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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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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.
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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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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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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.
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Amount of deferred tax liability attributable to taxable temporary differences from derivatives.
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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 mortgage servicing rights.
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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.
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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.
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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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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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