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Allowance for Credit Losses - Loans Modified in Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan |  | 2 | 2
Pre-modification outstanding recorded investment (number of loans) |  | $ 121 | $ 763
Post-modification outstanding recorded investment (number of loans) |  | $ 121 | $ 763
Defaulted TDRs (number of loans) | loan |  | 2 | 0
Defaulted TDRs, post-modification outstanding recorded investment (number of loans) |  | $ 124 | $ 0
Commercial real estate | Commercial and industrial other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan |  | 0 |
Pre-modification outstanding recorded investment (number of loans) |  | $ 0 |
Post-modification outstanding recorded investment (number of loans) |  | $ 0 |
Defaulted TDRs (number of loans) | loan |  | 1 |
Defaulted TDRs, post-modification outstanding recorded investment (number of loans) |  | $ 37 |
Residential real estate | Home equity |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan |  | 2 | 1
Pre-modification outstanding recorded investment (number of loans) |  | $ 121 | $ 168
Post-modification outstanding recorded investment (number of loans) |  | $ 121 | $ 168
Defaulted TDRs (number of loans) | loan |  | 1 | 0
Defaulted TDRs, post-modification outstanding recorded investment (number of loans) |  | $ 87 | $ 0
Commercial and Industrial | Commercial and industrial other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 1 | 0 | 1
Pre-modification outstanding recorded investment (number of loans) | $ 595 | $ 0 | $ 595
Post-modification outstanding recorded investment (number of loans) | $ 595 | $ 0 | $ 595
Defaulted TDRs (number of loans) | loan | 0 | 0 | 0
Defaulted TDRs, post-modification outstanding recorded investment (number of loans) | $ 0 | $ 0 | $ 0
Originated |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 1 |  |
Pre-modification outstanding recorded investment (number of loans) | $ 595 |  |
Post-modification outstanding recorded investment (number of loans) | $ 595 |  |
Defaulted TDRs (number of loans) | loan | 0 |  |
Defaulted TDRs, post-modification outstanding recorded investment (number of loans) | $ 0 |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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