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Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Significant Unobservable Inputs $ in Thousands | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Commercial, industrial, and agricultural |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | $ 540 | $ 2,055
Commercial mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | $ 1,166 | $ 679
Measurement Input, Loss Severity | Commercial, industrial, and agricultural | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.39 | 0.20
Measurement Input, Loss Severity | Commercial, industrial, and agricultural | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.78 | 0.60
Measurement Input, Loss Severity | Commercial, industrial, and agricultural | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.63 | 0.34
Measurement Input, Loss Severity | Commercial mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.15 |
Measurement Input, Loss Severity | Commercial mortgages | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input |  | 0.15
Measurement Input, Loss Severity | Commercial mortgages | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.90 | 0.39
Measurement Input, Loss Severity | Commercial mortgages | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.37 | 0.33

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- Definition Value of input used to measure loan, held for sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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