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Acquisition and Preliminary Purchase Price Allocation - Additional Information (Details) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 10, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Asset Acquisition [Line Items] |  |  |  |
Acquisition of Citizens Commerce Bancshares, Inc. |  |  | $ 62,078 |
Gain on sale of marketable securities |  |  |  | $ 700
Non-impaired loans | $ 246,400 |  |  |
Citizens Commerce Bancshares, Inc. |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Acquisition of Citizens Commerce Bancshares, Inc. (in shares) | 0.7 |  |  |
Acquisition of Citizens Commerce Bancshares, Inc. | $ 61,600 |  |  |
Business combination, acquired receivables, estimated uncollectible | 2,000 |  |  |
Fair value of purchased financial assets with credit deterioration | 4,900 |  |  |
Contractual amounts receivable | 8,500 |  |  |
Allowance for credit loss | 3,600 |  |  |
Premium on time deposits | $ 600 |  |  |
Time deposits amortization period | 5 years |  |  |
Citizens Commerce Bancshares, Inc. | Core Deposits |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
(Losses) gains on sale of investment securities, net |  | $ 41,000 |  |
Core deposit intangible | $ 8,278 | $ 0 | $ 8,278 |
Intangible assets amortization period | 10 years |  |  |
Citizens Commerce Bancshares, Inc. | Citizens Commerce Bancshares, Inc. |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Equity ownership positions in the community bank holding companies (percent) | 100.00% |  |  |

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