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Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	1	10	11
Pre-Modification Outstanding Recorded Investment	$ 317	$ 552	$ 1,108	$ 8,776
Post-Modification Outstanding Recorded Investment	276	552	977	8,529
Specific Reserves	$ 0	$ 0	$ 168	$ 1,168
Commercial | Real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1	2	8
Pre-Modification Outstanding Recorded Investment	$ 0	$ 552	$ 110	$ 1,608
Post-Modification Outstanding Recorded Investment	0	552	95	1,606
Specific Reserves	$ 0	$ 0	$ 95	$ 42
Commercial | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 6,727
Post-Modification Outstanding Recorded Investment	0	0	0	6,487
Specific Reserves	$ 0	$ 0	$ 0	$ 1,100
Municipal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0
Residential | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0
Residential | Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	0	8	2
Pre-Modification Outstanding Recorded Investment	$ 317	$ 0	$ 998	$ 441
Post-Modification Outstanding Recorded Investment	276	0	882	436
Specific Reserves	$ 0	$ 0	$ 73	$ 26
Home equity line of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0

X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings during the current period.

+ References

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- Definition

Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings during the period.

+ References

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- Definition

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+ References

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- Definition

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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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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