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Income Taxes (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) limited_partnership | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) limited_partnership | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) limited_partnership | Dec. 31, 2015 USD ($) limited_partnership | Dec. 31, 2014 USD ($)
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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition 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 other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition 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 investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition The amount of the limited partners' ownership interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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- Definition Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a)-(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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