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Income Taxes (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) limited_partnership | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) limited_partnership | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) limited_partnership | Dec. 31, 2016 USD ($) limited_partnership | Dec. 31, 2015 USD ($)
Federal income tax |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 4,184,000 | $ 6,276,000 | $ 4,895,000
Deferred |  |  |  |  |  |  |  |  | 2,083,000 | (139,000) | 332,000
Federal income tax expense |  |  |  |  |  |  |  |  | 6,267,000 | 6,137,000 | 5,227,000
State franchise tax |  |  |  |  |  |  |  |  | 345,000 | 317,000 | 287,000
Income tax expense | $ 1,782,000 | $ 1,702,000 | $ 1,644,000 | $ 1,484,000 | $ 1,470,000 | $ 1,656,000 | $ 1,713,000 | $ 1,615,000 | 6,612,000 | 6,454,000 | 5,514,000
Reconciliation between US expected tax rate and actual tax expense |  |  |  |  |  |  |  |  |  |  |
Expected tax expense |  |  |  |  |  |  |  |  | 9,170,000 | 8,562,000 | 7,602,000
Non-taxable income |  |  |  |  |  |  |  |  | (2,625,000) | (2,176,000) | (2,086,000)
State franchise tax, net of federal tax benefit |  |  |  |  |  |  |  |  | 224,000 | 206,000 | 187,000
Equity compensation |  |  |  |  |  |  |  |  | (83,000) | 0 | 0
Tax credits, net of amortization |  |  |  |  |  |  |  |  | (88,000) | (105,000) | (185,000)
Change in federal tax rate |  |  |  |  |  |  |  |  | 134,000 | 0 | 0
Other |  |  |  |  |  |  |  |  | (120,000) | (33,000) | (4,000)
Income tax expense | 1,782,000 | $ 1,702,000 | $ 1,644,000 | $ 1,484,000 | 1,470,000 | $ 1,656,000 | $ 1,713,000 | $ 1,615,000 | 6,612,000 | 6,454,000 | $ 5,514,000
Components of deferred tax assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 2,253,000 |  |  |  | 3,548,000 |  |  |  | 2,253,000 | 3,548,000 |
OREO | 11,000 |  |  |  | 72,000 |  |  |  | 11,000 | 72,000 |
Accrued pension and post-retirement | 1,036,000 |  |  |  | 1,730,000 |  |  |  | 1,036,000 | 1,730,000 |
Goodwill | 0 |  |  |  | 2,000 |  |  |  | 0 | 2,000 |
Unrealized loss on securities transferred from available for sale to held to maturity | 46,000 |  |  |  | 70,000 |  |  |  | 46,000 | 70,000 |
Unrealized loss on securities available for sale | 772,000 |  |  |  | 503,000 |  |  |  | 772,000 | 503,000 |
Restricted stock grants | 173,000 |  |  |  | 237,000 |  |  |  | 173,000 | 237,000 |
Core deposit intangible | 15,000 |  |  |  | 20,000 |  |  |  | 15,000 | 20,000 |
Investment in flow through entities | 22,000 |  |  |  | 29,000 |  |  |  | 22,000 | 29,000 |
Other assets | 28,000 |  |  |  | 48,000 |  |  |  | 28,000 | 48,000 |
Total deferred tax asset | 4,356,000 |  |  |  | 6,259,000 |  |  |  | 4,356,000 | 6,259,000 |
Net deferred loan costs | (1,313,000) |  |  |  | (1,895,000) |  |  |  | (1,313,000) | (1,895,000) |
Depreciation | (1,306,000) |  |  |  | (1,808,000) |  |  |  | (1,306,000) | (1,808,000) |
Goodwill | (39,000) |  |  |  | 0 |  |  |  | (39,000) | 0 |
Mortgage servicing rights | (266,000) |  |  |  | (390,000) |  |  |  | (266,000) | (390,000) |
Unrealized gain on derivative instruments | (410,000) |  |  |  | (626,000) |  |  |  | (410,000) | (626,000) |
Prepaid expense | (821,000) |  |  |  | 0 |  |  |  | (821,000) | 0 |
Total deferred tax liability | (4,155,000) |  |  |  | (4,719,000) |  |  |  | (4,155,000) | (4,719,000) |
Net deferred tax asset | $ 201,000 |  |  |  | $ 1,540,000 |  |  |  | $ 201,000 | $ 1,540,000 |
Limited partnerships |  |  |  |  |  |  |  |  |  |  |
Limited partnerships held as investments | limited_partnership | 2 |  |  |  | 2 |  |  |  | 2 | 2 |
Tax credits from investments in limited partnerships |  |  |  |  |  |  |  |  | $ 204,000 | $ 231,000 |
Amortization of investments in limited partnerships |  |  |  |  |  |  |  |  | 178,000 | 194,000 |
Carrying value of investments in limited partnerships | $ 1,408,000 |  |  |  | $ 1,503,000 |  |  |  | 1,408,000 | 1,503,000 |
Total exposure to limited partnerships | $ 1,408,000 |  |  |  | $ 1,503,000 |  |  |  | $ 1,408,000 | $ 1,503,000 |

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- Definition 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. + 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=84230637&loc=d3e32687-109319 Reference 2: 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 Reference 3: 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=84230637&loc=d3e32698-109319 + Details
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