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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 | Feb. 22, 2021 | Jan. 02, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jul. 28, 2021 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 4 | $ 4 |  |  |  |  |
Assets |  |  |  | $ 6,744,215,000 | $ 5,986,582,000 |  |  |  |  |
Loans |  |  |  | 4,766,781,000 | 3,938,120,000 |  |  |  |  |
Deposits |  |  |  | $ 5,257,001,000 | $ 4,956,486,000 |  |  |  |  |
Amortization period |  |  |  |  | 10 years |  |  |  |  |
Loans acquired |  |  |  |  | $ 208,000,000 |  |  |  |  |
Customer deposits assumed |  |  |  |  | 219,000,000 |  |  |  |  |
Core deposit intangible asset |  |  |  |  | 4,900,000 |  |  |  |  |
Federal funds selling period |  |  |  | 1 day |  |  |  |  |  |
Intangible assets amortization period |  |  |  | 15 years |  |  |  |  |  |
Captive maximum gross premiums |  |  |  | $ 2,450,000 |  |  |  |  |  |
Value of trust accounts |  |  |  | $ 5,300,000,000 | $ 5,100,000,000 |  |  |  |  |
Stock plans, term |  |  |  | 10 years |  |  |  |  |  |
Maximum number of shares to be issued in stock incentive plan (in shares) |  |  |  | 149,983 |  |  |  |  |  |
RSA/RSU, grants in period, gross |  |  |  | 63,150 | 48,575 | 25,950 |  |  |  |
Employee discount for employee stock purchase plan |  |  |  | 15.00% |  |  |  |  |  |
Employee stock purchase plan, number of shares authorized |  |  |  | 600,000 |  |  |  |  |  |
Stock issued during period, shares, employee stock purchase plans |  |  |  | 23,055 | 11,748 | 11,037 |  |  |  |
Right of use lease assets |  |  |  | $ 15,774,000 | $ 15,116,000 |  |  |  |  |
Lease liability |  |  |  | 16,035,000 | 15,322,000 |  |  |  |  |
Cumulative change in accounting principal |  |  |  | 633,155,000 | 633,894,000 | $ 568,228,000 |  |  | $ 526,609,000 |
Allowance for credit losses on loans |  |  |  | $ 59,093,000 | $ 54,655,000 | $ 41,910,000 |  |  | 26,911,000 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative change in accounting principal |  |  |  |  |  |  |  |  | (717,000) |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2019 |  |  |  |  |  |
Right of use lease assets |  |  |  |  |  |  |  |  |  | $ 14,100,000
Lease liability |  |  |  |  |  |  |  |  |  | $ 14,100,000
ASU 2016-13 |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  | $ 28,583,000 |  |
Off-balance sheet, credit loss, liability |  |  |  |  |  |  |  | 69,000 |  |
Allowance for credit losses, held-to-maturity debt securities |  |  |  |  |  |  |  | 0 |  |
Amortized cost of PCD assets reflected the addition to allowance for credit losses |  |  | $ 833,000,000 |  |  |  |  |  |  |
ASU 2016-13 | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  | 1,672,000 |  |
Off-balance sheet, credit loss, liability |  |  |  |  |  |  |  | 69,000 |  |
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative change in accounting principal |  |  |  |  |  |  |  | $ (717,000) |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  | $ 1,672,000 |
Minimum |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Certificates of deposit investments original maturities period |  |  |  | 3 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Certificates of deposit investments original maturities period |  |  |  | 5 years |  |  |  |  |  |
Delta Bancshare 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 |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |
Consideration payable in shares |  | 1,262,246 |  |  |  |  |  |  |  |
Dividends |  | $ 13,000,000 |  |  |  |  |  |  |  |

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