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Disclosures about fair value of assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
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Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis | The following table presents the fair value measurements of assets and liabilities recognized in the accompanying financial statements measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at the following:
|  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 19,052 |  |  | $ | — |  |  | $ | 19,052 |  |  | $ | — |
State and municipal |  |  | 149,564 |  |  |  | — |  |  |  | 149,564 |  |  |  | — |
Federal agency collateralized mortgage obligations |  |  | 130,365 |  |  |  | — |  |  |  | 130,365 |  |  |  | — |
Federal agency mortgage-backed pools |  |  | 208,657 |  |  |  | — |  |  |  | 208,657 |  |  |  | — |
Private labeled mortgage-backed pools |  |  | 1,642 |  |  |  | — |  |  |  | 1,642 |  |  |  | — |
Corporate notes |  |  | 385 |  |  |  | — |  |  |  | 385 |  |  |  | — |
Total available-for-sale securities |  |  | 509,665 |  |  |  | — |  |  |  | 509,665 |  |  |  | — |
Hedged loans |  |  | 154,575 |  |  |  | — |  |  |  | 154,575 |  |  |  | — |
Forward sale commitments |  |  | 143 |  |  |  | — |  |  |  | 143 |  |  |  | — |
Interest rate swap agreements |  |  | (917 | ) |  |  | — |  |  |  | (917 | ) |  |  | — |
Commitments to originate loans |  |  | (3 | ) |  |  | — |  |  |  | (3 | ) |  |  | — |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 7,989 |  |  | $ | — |  |  | $ | 7,989 |  |  | $ | — |
State and municipal |  |  | 116,592 |  |  |  | — |  |  |  | 116,592 |  |  |  | — |
Federal agency collateralized mortgage obligations |  |  | 137,195 |  |  |  | — |  |  |  | 137,195 |  |  |  | — |
Federal agency mortgage-backed pools |  |  | 176,726 |  |  |  | — |  |  |  | 176,726 |  |  |  | — |
Corporate notes |  |  | 1,329 |  |  |  | — |  |  |  | 1,329 |  |  |  | — |
Total available-for-sale securities |  |  | 439,831 |  |  |  | — |  |  |  | 439,831 |  |  |  | — |
Hedged loans |  |  | 122,345 |  |  |  | — |  |  |  | 122,345 |  |  |  | — |
Forward sale commitments |  |  | 602 |  |  |  | — |  |  |  | 602 |  |  |  | — |
Interest rate swap agreements |  |  | (3,138 | ) |  |  | — |  |  |  | (3,138 | ) |  |  | — |
Commitments to originate loans |  |  | (22 | ) |  |  | — |  |  |  | (22 | ) |  |  | — |
Realized Gains and Losses Included in Net Income for Periods in Consolidated Statements of Income | Realized gains and losses included in net income for the periods are reported in the consolidated statements of income as follows:
Non Interest Income |  | Years Ended December 31 |
Total gains and losses from: |  | 2017 |  |  | 2016 |  |  | 2015 |
Hedged loans |  | $ | (817 | ) |  | $ | (1,776 | ) |  | $ | 574 |
Fair value interest rate swap agreements |  |  | 817 |  |  |  | 1,776 |  |  |  | (574 | )
Derivative loan commitments |  |  | (439 | ) |  |  | (62 | ) |  |  | 195 |
|  | $ | (439 | ) |  | $ | (62 | ) |  | $ | 195 |
Other Assets Measured at Fair Value on Nonrecurring Basis | Certain other assets are measured at fair value on a nonrecurring basis in the ordinary course of business and are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment):
|  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  | $ | 6,957 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,957 |
Mortgage servicing rights |  |  | 11,602 |  |  |  | — |  |  |  | — |  |  |  | 11,602 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  | $ | 2,246 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,246 |
Mortgage servicing rights |  |  | 11,174 |  |  |  | — |  |  |  | — |  |  |  | 11,174 |
Qualitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill | The following table presents qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill, at December 31, 2017 and 2016.
|  | Fair Value at |  |  | Valuation |  |  |  | Range (Weighted |
|  | December 31, 2017 |  |  | Technique |  | Unobservable Inputs |  | Average) |
Impaired loans |  | $ | 6,957 |  |  | Collateral based measurement |  | Discount to reflect current market conditions and ultimate collectability |  |  | 0% - 46.8% (2.6%) |
Mortgage servicing rights |  | $ | 11,602 |  |  | Discounted cashflows |  | Discount rate, Constant prepayment rate, Probability of default |  |  | 9.6% - 10.8% (9.7%), 9.2% - 27.7% (10.5%), 0% - 1.5% (0.2%) |
|  | Fair Value at |  |  | Valuation |  |  |  | Range (Weighted |
|  | December 31, 2016 |  |  | Technique |  | Unobservable Inputs |  | Average) |
Impaired loans |  | $ | 2,246 |  |  | Collateral based measurement |  | Discount to reflect current market conditions and ultimate collectability |  |  | 10% - 16% (13%) |
Mortgage servicing rights |  | $ | 11,174 |  |  | Discounted cashflows |  | Discount rate, Constant prepayment rate, Probability of default |  |  | 10% - 16% (13%), 4% - 7% (4.6%), 1% - 10% (4.5%) |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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