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Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) contract | Mar. 31, 2019 USD ($)
Summary of Significant Accounting Policies |  |
Number of active contracts | contract | 735,000 |
Transferred at Point in Time |  |
Summary of Significant Accounting Policies |  |
Revenue from contract with customers | $ 24,900 | $ 24,100
Transferred over Time |  |
Summary of Significant Accounting Policies |  |
Revenue from contract with customers | 4,600 | 5,000
Trust and investment services income |  |
Summary of Significant Accounting Policies |  |
Revenue from contract with customers | 7,389 | 7,269
Deposit account services |  |
Summary of Significant Accounting Policies |  |
Revenue from contract with customers | $ 18,400 | $ 18,100

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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