Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) security $ / shares shares	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Private mortgage-backed security fair value	$ 900,000	$ 1,000,000
Number of securities in an unrealized loss position | security	371	69
Impairment charges on securities available for sale		$ 0
Impairment charges on securities held to maturity		0
Investment securities, pledged as collateral for public deposits	$ 951,400,000	630,300,000
Proceeds from sales of securities available for sale	106,484,000	219,697,000	$ 39,797,000
Losses (gains) on securities available for sale	1,237,000	(8,024,000)	$ (97,000)
FHLB stock and FRB stock, cost	22,300,000	23,500,000
FHLB, cost	4,600,000	5,900,000
FRB stock	$ 17,800,000	$ 17,700,000
Visa, Inc | Common Class B
Debt and Equity Securities, FV-NI [Line Items]
Stock owned (in shares) | shares	12,356
Carrying value of shares	$ 0
Visa, Inc | Common Class A
Debt and Equity Securities, FV-NI [Line Items]
Conversion price (in usd per share) | $ / shares	$ 1.62
Conversion of stock (in shares) | shares	19,993