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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 3,318,923	$ 2,784,562
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	2,211,871	1,785,243
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	29,980	35,533
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	64,530	39,891
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	0	0
Pass, Special Mention, Substandard, Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	2,306,381	1,860,667
Commercial, industrial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,312,395	1,046,665
Commercial, industrial and agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,263,928	1,004,445
Commercial, industrial and agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	18,849	16,696
Commercial, industrial and agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	29,618	25,524
Commercial, industrial and agricultural | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	0	0
Commercial mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	993,986	814,002
Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	947,943	780,798
Commercial mortgages | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	11,131	18,837
Commercial mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	34,912	14,367
Commercial mortgages | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 0	$ 0

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+ References

No definition available.

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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

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