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Allowance for Loan and Lease Losses - Loans by Class Modified as Troubled Debt Restructurings (Details) - Originated Loans and Leases $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	5	7
Pre-Modification Outstanding Recorded Investment	$ 2,362	$ 533
Post- Modification Outstanding Recorded Investment	$ 2,362	$ 533
Number of Loans Defaulted TDRs | loan	1	0
Post- Modification Outstanding Recorded Investment TDRs	$ 93	$ 0
Commercial and industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2
Pre-Modification Outstanding Recorded Investment	$ 604
Post- Modification Outstanding Recorded Investment	$ 604
Number of Loans Defaulted TDRs | loan	0
Post- Modification Outstanding Recorded Investment TDRs	$ 0
Commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	1
Pre-Modification Outstanding Recorded Investment	$ 1,577	$ 26
Post- Modification Outstanding Recorded Investment	$ 1,577	$ 26
Number of Loans Defaulted TDRs | loan	0	0
Post- Modification Outstanding Recorded Investment TDRs	$ 0	$ 0
Residential real estate | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	6
Pre-Modification Outstanding Recorded Investment	$ 181	$ 507
Post- Modification Outstanding Recorded Investment	$ 181	$ 507
Number of Loans Defaulted TDRs | loan	1	0
Post- Modification Outstanding Recorded Investment TDRs	$ 93	$ 0

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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

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Amount, after troubled debt restructuring, of modified financing receivable.

+ 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

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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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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