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Securities - Additional Information (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($)
Schedule Of Investments [Line Items] |  |  |
Trading securities |  | $ 0 |
Net gains reclassified from accumulated other comprehensive income earnings | $ 1,500 |  |
Investment securities posted as collateral |  | $ 463,600 | $ 332,300
Minimum |  |  |
Schedule Of Investments [Line Items] |  |  |
Percentage of shareholders equity for which securities holdings exceeds for no issuer other than U.S. Government and agencies |  | 10.00% | 10.00%
Federal Home Loan Bank Advances |  |  |
Schedule Of Investments [Line Items] |  |  |
Carrying amount of securities pledged as collateral |  | $ 0 | $ 0
Public Fund Deposits |  |  |
Schedule Of Investments [Line Items] |  |  |
Carrying amount of securities pledged as collateral |  | 402,000 | 277,100
Customer Repurchase Agreements |  |  |
Schedule Of Investments [Line Items] |  |  |
Carrying amount of securities pledged as collateral |  | $ 39,000 | $ 38,800
Available-for-sale Securities |  |  |
Schedule Of Investments [Line Items] |  |  |
Investment securities with unrealized losses | Security |  | 223 |
Held-to-maturity Securities |  |  |
Schedule Of Investments [Line Items] |  |  |
Investment securities with unrealized losses | Security |  | 0 |

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