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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment | $ 3,337,449 | $ 2,804,035 | $ 2,784,562
Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  | 1,046,665 |
Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  | $ 814,002 |
Internal Noninvestment Grade |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 1,860,667
Internal Noninvestment Grade | Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 1,046,665
Internal Noninvestment Grade | Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 814,002
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 1,785,243
Pass | Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 1,004,445
Pass | Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 780,798
Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 35,533
Special Mention | Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 16,696
Special Mention | Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 18,837
Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 39,891
Substandard | Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 25,524
Substandard | Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 14,367
Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 0
Doubtful | Commercial, industrial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | 0
Doubtful | Commercial mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Amount of recorded investment |  |  | $ 0

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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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