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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Line Items] |  |
Other Repossessed Assets | $ 3,954 | $ 5,510
Goodwill | 112,739 | 72,334
Other Intangible Assets, Net | 6,971 | 0
Average required reserve balance | $ 73,900 | $ 64,800
Historical loss period used in estimating loan loss reserve | 108 months | 96 months
Reserve coverage period in historical losses | 1 year 10 months 14 days | 1 year 11 months 2 days
Compensating Balance, Amount | $ 0 |
Goodwill, Acquired During Period | $ 40,405 |
Commercial Loan |  |
Accounting Policies [Line Items] |  |
Reserve coverage period in historical losses | 3 years 4 months 21 days | 3 years 2 months 28 days
Consumer |  |
Accounting Policies [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment | 0.0033 | 0.0034
Commercial Portfolio Segment [Member] |  |
Accounting Policies [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment | 0.0035 | 0.0037

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- Definition The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition A description of the factors that influenced management's judgment concerning the allowance for credit losses including historical losses and existing economic conditions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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