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Securities - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) security $ / shares shares | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Private mortgage-backed security fair value | $ 700,000 | $ 800,000 |
Number of securities | security | 657 | 666 |
Number of securities in an unrealized loss position | security | 632 | 644 |
Investment securities, pledged as collateral for public deposits | $ 820,900,000 |  |
Proceeds from sales of securities available for sale | 111,863,000 | $ 0 | $ 106,484,000
Losses on sales of securities available for sale, net | 0 | 0 | $ (1,237,000)
FHLB stock and FRB stock, cost | 54,500,000 | 39,600,000 |
FHLB, cost | 21,700,000 | 14,700,000 |
FRB stock | 32,800,000 | 24,900,000 |
Collateral For Public Deposits |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Investment securities, pledged as collateral for public deposits | 971,300,000 | 758,000,000 |
Collateral For FRB Borrowings |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Investment securities, pledged as collateral for public deposits | $ 679,000,000 | $ 0 |
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 | $ 1.59 |  |
Conversion of stock (in shares) | shares | 19,615 |  |

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