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Loans and Allowance for Loan Losses - Allowance for Loan Losses Outstanding by Impairment Methodology (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 10,754 | $ 8,259
Collectively evaluated for impairment | 45,174 | 43,130
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 1,110 | 669
Collectively evaluated for impairment | 5,848 | 5,659
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 1,152 | 1,119
Collectively evaluated for impairment | 10,611 | 9,908
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 556 | 505
Collectively evaluated for impairment | 2,805 | 2,756
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 4,379 | 3,413
Collectively evaluated for impairment | 7,822 | 7,260
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,185 | 2,114
Collectively evaluated for impairment | 12,199 | 11,037
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 355 | 374
Collectively evaluated for impairment | 2,919 | 2,691
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 17 | 65
Collectively evaluated for impairment | 2,630 | 2,358
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 276 | $ 1,461
Pegasus Bank [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | $ 64 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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