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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 | Sep. 10, 2021 | Feb. 22, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Jun. 30, 2022 | Jul. 28, 2021 | Sep. 25, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 4 |  | $ 4 |  | $ 4 | $ 4 |  |
Loans acquired |  | $ 208,000,000 |  |  |  |  |  |  |  |  |
Deposits |  | 215,000,000 |  | $ 5,318,978,000 |  | $ 5,318,978,000 |  | $ 4,956,486,000 | $ 5,318,978,000 |  |
Core deposit intangible asset |  | $ 4,900,000 |  |  |  |  |  |  |  |  |
Amortization period |  | 10 years |  |  |  |  |  |  |  |  |
Stock plans, term |  |  |  |  |  | 10 years |  |  |  |  |
Maximum number of shares to be issued in stock incentive plan (in shares) |  |  |  | 399,983 |  | 399,983 |  |  | 399,983 |  |
Employee discount for employee stock purchase plan |  |  |  |  |  | 15.00% |  |  |  |  |
Employee stock purchase plan, number of shares authorized |  |  |  | 600,000 |  | 600,000 |  |  | 600,000 |  |
Stock issued during period, shares, employee stock purchase plans |  |  |  | 5,177 | 2,597 | 8,326 | 8,439 |  | 40,010 |  |
Captive maximum gross premiums |  |  |  |  |  | $ 2,300,000 |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock awarded in SI plan (in shares) |  |  |  |  |  | 0 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock awarded in SI plan (in shares) |  |  |  |  |  | 61,400 |  | 27,750 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock awarded in SI plan (in shares) |  |  |  |  |  | 37,150 |  | 35,400 |  |  |
Delta Bancshares Company |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding shares acquired |  |  |  |  |  |  |  |  |  | 100.00% |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.00 |
Share Price |  |  |  |  |  |  |  |  |  | $ 4.00 |
Consideration payable in cash | $ 15,150,000 |  |  |  |  |  |  |  |  |  |
Consideration payable in shares | 2,292,270 |  |  |  |  |  |  |  |  |  |
LINCO Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding shares acquired |  |  |  |  |  |  |  |  |  |  | 100.00%
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.00
Share Price |  |  |  |  |  |  |  |  |  |  | $ 4.00
Consideration payable in cash |  |  | $ 103,500,000 |  |  |  |  |  |  |  |
Consideration payable in shares |  |  | 1,262,246 |  |  |  |  |  |  |  |
Dividends |  |  | $ 13,000,000 |  |  |  |  |  |  |  |

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