Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Pledged securities as collateral for public fund deposits and borrowings	$ 166,600,000
Pledged securities, market value	$ 166,700,000
Number of debt securities with unrealized losses | security	110
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis	0.60%
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio	0.30%
Number of debt securities in continuous loss position for over 12 months | security	58
Debt securities in a continuous loss position for over 12 months, amortized cost basis	$ 62,300,000
Debt securities in a continuous loss position for over 12 months, unrealized loss	500,000
Other-than-temporary impairment credit losses on securities not previously OTTI	$ 0	$ 0