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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Loans contract	Mar. 31, 2018 USD ($) Loans contract	Dec. 31, 2018 USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 3,135		$ 3,220
Reserves specific to modified loans	53		50
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0
Number of Loans | Loans	0	0
Defaults on troubled debt restructurings | contract	0	0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment			36
Number of Loans | Loans		1
Pre-Modification Outstanding Recorded Investment		$ 38
Principal Modification		0
Post Modification Outstanding Recorded Investment		$ 38
Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment			$ 165
Number of Loans | Loans		1
Pre-Modification Outstanding Recorded Investment		$ 166
Principal Modification		0
Post Modification Outstanding Recorded Investment		166
Consumer
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 13
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 13
Principal Modification	0
Post Modification Outstanding Recorded Investment	13
Consumer | Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 13
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 13
Principal Modification	0
Post Modification Outstanding Recorded Investment	$ 13
Commercial and Real Estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		$ 201
Number of Loans | Loans		2
Pre-Modification Outstanding Recorded Investment		$ 204
Principal Modification		0
Post Modification Outstanding Recorded Investment		$ 204

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