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Securities - Narrative (Details) | 12 Months Ended
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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 |  |

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