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Business Combinations - Additional Information (Details) - USD ($) |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 | Feb. 22, 2021 | Mar. 31, 2022 | Jul. 28, 2021 | Mar. 31, 2021 | Sep. 25, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 4 |  | $ 4 |
Delta Bancshare Company |  |  |  |  |  |
Business Acquisition [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 paid in cash | $ 15,150,000 |  |  |  |  |
Consideration paid in shares | 2,292,270 |  |  |  |  |
Goodwill acquired during period | $ 28,600,000 |  |  |  |  |
Pre-tax of acquisition costs | 785,000 |  | $ 535,000 |  |  |
Loans | 418,509,000 |  |  |  |  |
Accreted to interest income over the remaining term of loans | 8,200,000 |  |  |  |  |
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank | 300,000 |  |  |  |  |
Allowance for credit losses for loans identified as PCD | 863,000 |  | 863,000 |  |  |
Purchased credit deteriorated loans |  |  | 18,796,000 |  |  |
Change in acquired time deposits | 560,378,000 |  |  |  |  |
Change in FHLB advances | 45,075,000 |  |  |  |  |
Delta Bancshare Company | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value | $ 5,920,000 |  |  |  |  |
Intangible asset estimated useful life | 10 years |  |  |  |  |
Delta Bancshare Company | Fair Value Adjustments |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans | $ (7,924,000) |  |  |  |  |
Change in acquired time deposits | 1,759,000 |  |  |  |  |
Change in FHLB advances | 75,000 |  |  |  |  |
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value | 5,920,000 |  |  |  |  |
Delta Bancshare Company | Acquired Book Value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans | 426,433,000 |  |  |  |  |
Purchased credit deteriorated loans | 18,800,000 |  |  |  |  |
Change in acquired time deposits | 558,619,000 |  |  |  |  |
Change in FHLB advances | 45,000,000 |  |  |  |  |
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value | $ 0 |  |  |  |  |
LINCO Bancshares, Inc. |  |  |  |  |  |
Business Acquisition [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 paid in cash |  | $ 103,500,000 |  |  |  |
Consideration paid in shares |  | 1,262,246 |  |  |  |
Dividends paid |  | $ 13,000,000 |  |  |  |
Goodwill acquired during period |  | 5,400,000 |  |  |  |
Pre-tax of acquisition costs |  | 9,000,000 |  |  | $ 8,500,000 |
Loans |  | 828,976,000 |  |  |  |
Accreted to interest income over the remaining term of loans |  | 11,100,000 |  |  |  |
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank |  | 1,700,000 |  |  |  |
Allowance for credit losses for loans identified as PCD |  | 2,000,000 | 2,074,000 |  |  |
Purchased credit deteriorated loans |  |  | $ 64,647,000 |  |  |
Change in acquired time deposits |  | 990,410,000 |  |  |  |
Change in FHLB advances |  | 27,916,000 |  |  |  |
LINCO Bancshares, Inc. | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value |  | $ 2,148,000 |  |  |  |
Intangible asset estimated useful life |  | 10 years |  |  |  |
LINCO Bancshares, Inc. | Fair Value Adjustments |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans |  | $ (9,401,000) |  |  |  |
Change in acquired time deposits |  | 2,081,000 |  |  |  |
Change in FHLB advances |  | 975,000 |  |  |  |
LINCO Bancshares, Inc. | Fair Value Adjustments | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value |  | 2,025,000 |  |  |  |
LINCO Bancshares, Inc. | Acquired Book Value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans |  | 838,377,000 |  |  |  |
Purchased credit deteriorated loans |  | 64,600,000 |  |  |  |
Change in acquired time deposits |  | 988,329,000 |  |  |  |
Change in FHLB advances |  | 26,941,000 |  |  |  |
LINCO Bancshares, Inc. | Acquired Book Value | Core Deposit Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset fair value |  | $ 123,000 |  |  |  |

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