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Business Combinations - Additional Information (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 22, 2021 | Sep. 25, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 4 | $ 4
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 payable in cash | $ 103,500,000 | $ 103,500,000 |  |
Consideration payable in shares |  | 1,262,246 |  |
Dividends paid |  | $ 13,000,000 |  |
Goodwill acquired during period | 8,900,000 |  |  |
Pre-tax of acquisition costs | 3,100,000 |  | $ 2,600,000 |
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 Providence 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 assets 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 assets 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 assets fair value | $ 123,000 |  |  |

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