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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
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

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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