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Commitments and Contingent Liabilities - Summary of Contract or Notional Amount of Outstanding Loan and Lease Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Commitments And Contingencies Liabilities [Line Items] |  |
Fixed Rate | $ 56,576 | $ 76,081
Variable Rate | 973,896 | 963,062
Commitments to Extend Credit |  |
Commitments And Contingencies Liabilities [Line Items] |  |
Fixed Rate | 55,852 | 74,099
Variable Rate | 908,382 | 928,991
Letters of Credit |  |
Commitments And Contingencies Liabilities [Line Items] |  |
Fixed Rate | 724 | 1,982
Variable Rate | $ 65,514 | $ 34,071

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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