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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 23 | 25 |
Commercial, industrial, and agricultural |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 10 | 10 |
Commercial mortgages |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 13 | 15 |
Residential real estate |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Consumer |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Credit cards |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Trouble Debt Restructuring |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 1 | 5 | 6
Pre-Modification Outstanding Recorded Investment | $ | $ 383 | $ 1,570 | $ 9,171
Post-Modification Outstanding Recorded Investment | $ | $ 383 | $ 1,570 | $ 9,171
Trouble Debt Restructuring | Commercial, industrial, and agricultural |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 4
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 2,750
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 2,750
Trouble Debt Restructuring | Commercial mortgages |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 1 | 5 | 2
Pre-Modification Outstanding Recorded Investment | $ | $ 383 | $ 1,570 | $ 6,421
Post-Modification Outstanding Recorded Investment | $ | $ 383 | $ 1,570 | $ 6,421
Trouble Debt Restructuring | Residential real estate |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Trouble Debt Restructuring | Consumer |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Trouble Debt Restructuring | Credit cards |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 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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