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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis | Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:
|  |  | Fair Value Measurements at Reporting Date Using
As of December 31, 2017 | Balance |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale: |  |  |  |  |  |  |
U.S. Treasury Notes | $ | 3.2 |  |  | $ | — |  |  | $ | 3.2 |  |  | $ | — |
Obligations of U.S. government agencies | 561.5 |  |  | — |  |  | 561.5 |  |  | — |
U.S. agency mortgage-backed securities & collateralized mortgage obligations | 1,462.5 |  |  | — |  |  | 1,462.5 |  |  | — |
Private mortgage-backed securities | 90.7 |  |  | — |  |  | 90.7 |  |  | — |
Corporate securities | 87.9 |  |  | — |  |  | 87.9 |  |  | — |
Other investments | 3.0 |  |  | — |  |  | 3.0 |  |  | — |
Loans held for sale | 46.6 |  |  | — |  |  | 46.6 |  |  | — |
Derivative assets: |  |  |  |  |  |  |
Interest rate swap contracts | 7.5 |  |  | — |  |  | 7.5 |  |  | — |
Interest rate lock commitments | 1.3 |  |  | — |  |  | 1.3 |  |  | — |
Derivative liabilities: |  |  |  |  |  |  |  |
Interest rate swap contracts | 7.8 |  |  | — |  |  | 7.8 |  |  | — |
Forward loan sales contracts | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Deferred compensation plan assets | 12.2 |  |  | — |  |  | 12.2 |  |  | — |
Deferred compensation plan liabilities | 12.2 |  |  | — |  |  | 12.2 |  |  | — |
|  |  | Fair Value Measurements at Reporting Date Using
As of December 31, 2016 | Balance |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale: |  |  |  |  |  |  |
U.S. Treasury Notes | $ | 3.6 |  |  | $ | — |  |  | $ | 3.6 |  |  | $ | — |
Obligations of U.S. government agencies | 391.3 |  |  | — |  |  | 391.3 |  |  | — |
U.S. agency mortgage-backed securities & collateralized mortgage obligations | 1,213.7 |  |  | — |  |  | 1,213.7 |  |  | — |
Private mortgage-backed securities | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Other investments | 3.0 |  |  | — |  |  | 3.0 |  |  | — |
Loans held for sale | 61.8 |  |  | — |  |  | 61.8 |  |  | — |
Derivative assets: |  |  |  |  |  |  |
Interest rate swap contracts | 1.3 |  |  | — |  |  | 1.3 |  |  | — |
Interest rate lock commitments | 1.1 |  |  | — |  |  | 1.1 |  |  | — |
Forward loan sales contracts | 0.3 |  |  | — |  |  | 0.3 |  |  | — |
Derivative liabilities: |  |  |  |  |  |  |
Interest rate swap contracts | 1.3 |  |  | — |  |  | 1.3 |  |  | — |
Deferred compensation plan assets | 10.6 |  |  | — |  |  | 10.6 |  |  | — |
Deferred compensation plan liabilities | 10.6 |  |  | — |  |  | 10.6 |  |  | — |
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis | The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.
|  | Fair Value Measurements at Reporting Date Using
As of December 31, 2017 | Total | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Total Gains (Losses)
Impaired loans | $ | 32.6 |  | $ | — |  | $ | — |  | $ | 32.6 |  | $ | 22.2 |
Other real estate owned | 1.3 |  | — |  | — |  | 1.3 |  | (1.6 | )
Long-lived assets to be disposed of by sale | 0.8 |  | — |  | — |  | 0.8 |  | — |
|  | Fair Value Measurements at Reporting Date Using
As of December 31, 2016 | Total | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Total Gains (Losses)
Impaired loans | $ | 39.3 |  | $ | — |  | $ | — |  | $ | 39.3 |  | $ | (25.8 | )
Other real estate owned | 2.1 |  | — |  | — |  | 2.1 |  | (1.7 | )
Long-lived assets to be disposed of by sale | 1.3 |  | — |  | — |  | 1.3 |  | (1.0 | )
Fair Value Inputs, Assets, Quantitative Information | The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:
As of December 31, 2017 | Fair Value | Valuation Technique | Unobservable Inputs | Range (Weighted Average)
Impaired loans | $ | 32.6 |  | Appraisal | Appraisal adjustment | 0% | - | 78.11% | (26.1%)
Other real estate owned | 1.3 |  | Appraisal | Appraisal adjustment | 8% | - | 96% | (11.55%)
Long-lived assets to be disposed of by sale | 0.8 |  | Appraisal | Appraisal adjustment | 0% | - | 0% | 0%
As of December 31, 2016 | Fair Value | Valuation Technique | Unobservable Inputs | Range (Weighted Average)
Impaired loans | $ | 39.3 |  | Appraisal | Appraisal adjustment | 0% | - | 66% | (31%)
Other real estate owned | 2.1 |  | Appraisal | Appraisal adjustment | 8% | - | 96% | (18%)
Long-lived assets to be disposed of by sale | 1.3 |  | Appraisal | Appraisal adjustment | 0% | - | 9% | (6%)
Fair Value, by Balance Sheet Grouping | A summary of the estimated fair values of financial instruments follows:
| ` |  | Fair Value Measurements at Reporting Date Using
As of December 31, 2017 | Carrying Amount | Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Financial assets: |  |  |  |  |  |
Cash and cash equivalents | $ | 759.0 |  | $ | 759.0 |  | $ | 759.0 |  | $ | — |  | $ | — |
Investment securities available-for-sale | 2,208.7 |  | 2,208.7 |  | — |  | 2,208.7 |  | — |
Investment securities held-to-maturity | 484.5 |  | 483.3 |  | — |  | 483.3 |  | — |
Accrued interest receivable | 38.0 |  | 38.0 |  | — |  | 38.0 |  | — |
Mortgage servicing rights, net | 24.8 |  | 40.1 |  | — |  | 40.1 |  | — |
Net loans | 7,542.2 |  | 7,298.8 |  | — |  | 7,266.2 |  | 32.6 |
Derivative assets | 8.8 |  | 8.8 |  | — |  | 8.8 |  | — |
Deferred compensation plan assets | 12.2 |  | 12.2 |  | — |  | 12.2 |  | — |
Total financial assets | $ | 11,078.2 |  | $ | 10,848.9 |  | $ | 759.0 |  | $ | 10,057.3 |  | $ | 32.6 |
Financial liabilities: |  |  |  |  |
Total deposits, excluding time deposits | $ | 8,783.0 |  | $ | 8,783.0 |  | $ | 8,783.0 |  | $ | — |  | $ | — |
Time deposits | 1,151.9 |  | 1,137.9 |  | — |  | 1,137.9 |  | — |
Securities sold under repurchase agreements | 643.0 |  | 643.0 |  | — |  | 643.0 |  | — |
Other borrowed funds | 20.0 |  | 20.0 |  | — |  | 20.0 |  | — |
Accrued interest payable | 5.6 |  | 5.6 |  | — |  | 5.6 |  | — |
Long-term debt | 13.1 |  | 11.3 |  | — |  | 11.3 |  | — |
Subordinated debentures held by subsidiary trusts | 82.5 |  | 76.7 |  | — |  | 76.7 |  | — |
Derivative liabilities | 7.9 |  | 7.9 |  | — |  | 7.9 |  | — |
Deferred compensation plan liabilities | 12.2 |  | 12.2 |  | — |  | 12.2 |  | — |
Total financial liabilities | $ | 10,719.2 |  | $ | 10,697.6 |  | $ | 8,783.0 |  | $ | 1,914.6 |  | $ | — |
|  |  | Fair Value Measurements at Reporting Date Using
As of December 31, 2016 | Carrying Amount | Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Financial assets: |  |  |  |  |
Cash and cash equivalents | $ | 782.0 |  | $ | 782.0 |  | $ | 782.0 |  | $ | — |  | $ | — |
Investment securities available-for-sale | 1,611.7 |  | 1,611.7 |  | — |  | 1,611.7 |  | — |
Investment securities held-to-maturity | 512.8 |  | 513.3 |  | — |  | 513.3 |  | — |
Accrued interest receivable | 29.9 |  | 29.9 |  | — |  | 29.9 |  | — |
Mortgage servicing rights, net | 18.5 |  | 35.7 |  | — |  | 35.7 |  | — |
Net loans | 5,402.3 |  | 5,309.9 |  | — |  | 5,270.6 |  | 39.3 |
Derivative assets | 2.7 |  | 2.7 |  | — |  | 2.7 |  | — |
Deferred compensation plan assets | 10.6 |  | 10.6 |  | — |  | 10.6 |  | — |
Total financial assets | $ | 8,370.5 |  | $ | 8,295.8 |  | $ | 782.0 |  | $ | 7,474.5 |  | $ | 39.3 |
Financial liabilities: |  |  |  |  |
Total deposits, excluding time deposits | $ | 6,324.5 |  | $ | 6,324.5 |  | $ | 6,324.5 |  | $ | — |  | $ | — |
Time deposits | 1,051.6 |  | 1,044.7 |  | — |  | 1,044.7 |  | — |
Securities sold under repurchase agreements | 537.6 |  | 537.6 |  | — |  | 537.6 |  | — |
Other borrowed funds | — |  | — |  | — |  | — |  | — |
Accrued interest payable | 5.4 |  | 5.4 |  | — |  | 5.4 |  | — |
Long-term debt | 28.0 |  | 27.5 |  | — |  | 27.5 |  | — |
Subordinated debentures held by subsidiary trusts | 82.5 |  | 73.6 |  | — |  | 73.6 |  | — |
Derivative liabilities | 1.3 |  | 1.3 |  | — |  | 1.3 |  | — |
Deferred compensation plan liabilities | 10.6 |  | 10.6 |  | — |  | 10.6 |  | — |
Total financial liabilities | $ | 8,041.5 |  | $ | 8,025.2 |  | $ | 6,324.5 |  | $ | 1,700.7 |  | $ | — |

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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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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 + Details
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