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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 15,393	$ 14,727	$ 14,381
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,532	1,226	981
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	261	0	286
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	7,014	8,664	8,900
Municipal
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential | Term
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	5,892	4,062	3,509
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	694	760	689
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 15	$ 16

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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