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Securities (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Private mortgage-backed security fair value	$ 1,000,000.0	$ 1,000,000
Other than temporary impairment losses	0	0
Investment securities, pledged as collateral for public deposits	303,878,000	234,382,000
FHLB stock and FRB stock, cost	33,260,000	37,468,000
FHLB, cost	15,789,000	20,036,000
FRB stock	$ 17,471,000	$ 17,432,000
Visa, Inc | Common Class B
Debt and Equity Securities, FV-NI [Line Items]
Stock owned (in shares)	12,356
Visa, Inc | Common Class A
Debt and Equity Securities, FV-NI [Line Items]
Conversion price (in dollars per share)	$ 1.63
Conversion of stock (in shares)	20,140

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