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Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details) - Originated Loans and Leases $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	1	2	2
Pre-Modification Outstanding Recorded Investment	$ 49	$ 89	$ 112	$ 162
Post-Modification Outstanding Recorded Investment	$ 49	$ 89	$ 112	$ 162
Number of Loans | loan	0	0	0	1,000
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 55
Residential real estate | Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	1	2	2
Pre-Modification Outstanding Recorded Investment	$ 49	$ 89	$ 112	$ 162
Post-Modification Outstanding Recorded Investment	$ 49	$ 89	$ 112	$ 162
Number of Loans | loan	0	0	0	1,000
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 55

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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