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Description of Business and Summary of Significant Accounting Policies - Schedule of Impact of ASC 326 Adoption on Allowance for Credit losses on Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 89,500 | $ 70,080 |  | $ 54,238 | $ 55,108 | $ 52,915 | $ 51,389
Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 54,238 |  |  |  |
ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 51,043 |  |  |  |
ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (3,195) |  |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 6,630 | 4,544 |  | 5,625 |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 5,625 |  |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,819 |  |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (2,806) |  |  |  |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 9,483 | 5,935 |  | 8,358 |  |  |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 8,358 |  |  |  |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,851 |  |  |  |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (5,507) |  |  |  |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 1,755 | 1,136 |  | 2,214 |  |  |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,214 |  |  |  |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,158 |  |  |  |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (1,056) |  |  |  |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 2,259 | 1,618 |  | 1,933 |  |  |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,933 |  |  |  |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,155 |  |  |  |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (778) |  |  |  |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 8,553 | 6,192 |  | 8,692 |  |  |
Real Estate [Member] | Residential Real Estate First Lien [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 8,692 |  |  |  |
Real Estate [Member] | Residential Real Estate First Lien [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 4,861 |  |  |  |
Real Estate [Member] | Residential Real Estate First Lien [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (3,831) |  |  |  |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 2,720 | 2,292 |  | 2,767 | 11,721 | 11,046 | 10,673
Real Estate [Member] | Residential Real Estate All Other [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,767 |  |  |  |
Real Estate [Member] | Residential Real Estate All Other [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,359 |  |  |  |
Real Estate [Member] | Residential Real Estate All Other [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (1,408) |  |  |  |
Real Estate [Member] | Farmland [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,821 |  |  |  |
Real Estate [Member] | Farmland [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,413 |  |  |  |
Real Estate [Member] | Farmland [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (1,408) |  |  |  |
Commercial and Agricultural Non-Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 44,505 | 37,276 |  | 15,345 |  |  |
Commercial and Agricultural Non-Real Estate [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 15,345 |  |  |  |
Commercial and Agricultural Non-Real Estate [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 27,194 |  |  |  |
Commercial and Agricultural Non-Real Estate [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 11,849 |  |  |  |
Consumer Non-real Estate [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 4,714 | 3,385 |  | 3,252 | 3,234 | 3,072 | 3,065
Consumer Non-real Estate [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 3,252 |  |  |  |
Consumer Non-real Estate [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,630 |  |  |  |
Consumer Non-real Estate [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (622) |  |  |  |
Other Loans [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 2,513 | 2,751 |  | 2,632 | $ 2,449 | $ 2,408 | $ 2,423
Other Loans [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,632 |  |  |  |
Other Loans [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 2,516 |  |  |  |
Other Loans [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | (116) |  |  |  |
Pegasus Bank [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 3,857 | $ 3,163 |  | $ 599 |  |  |
Pegasus Bank [Member] | Pre ASC 326 Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 599 |  |  |  |
Pegasus Bank [Member] | ASC 326 [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 3,087 |  |  |  |
Pegasus Bank [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 2,488 |  |  |  |

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