Investment Securities - Narrative (Details)	Mar. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged as collateral	$ 576,123,000	$ 503,427,000
Book value of securities sold under agreements to repurchase	174,705,000	182,856,000
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross unrealized losses	407,000	2,211,000
Held-to-maturity unrealized losses	28,000	545,000
State and municipal
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross unrealized losses	$ 306,000	807,000
Number of securities in unrealized loss positions | security	17
Held-to-maturity unrealized losses	$ 28,000	107,000
Held-to-maturity, number of securities in unrealized loss positions | security	4
U.S. Government-sponsored mortgage-backed securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross unrealized losses	$ 101,000	1,404,000
Number of securities in unrealized loss positions | security	3
Held-to-maturity unrealized losses	$ 0	$ 401,000