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v3.20.1

Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Segment $ / shares | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for loan losses related to commercial, commercial real estate and farm real estate loans | $ 750,000 |  |  |
Number of days reaching which loans are considered for nonaccrual status | 90 days |  |  |
Federal Home Loan Bank par value | $ / shares | $ 100 |  |  |
Reserve amount | $ 7,127,000 |  |  |
Number of operating segments | Segment | 1 |  |  |
Right-of-use asset | $ 3,273,000 |  |  | $ 2,210,000
Lease liability | 3,273,000 |  |  | $ 2,210,000
Change in accounting principle for adoption of ASU 2016-02 | $ 0 |  |  |
Unsecured Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Retail loans past due charge off period | 90 days |  |  |
Secured Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Residential real estate loans past due assessment of value period | 180 days |  |  |
Other Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Loans past due charged down to the net realizable value period | 90 days |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Original maturities for cash and cash equivalents | 90 days |  |  |
Estimated useful life of intangible assets | 12 years |  |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 7 years |  |  |
Maximum [Member] | Buildings and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 50 years |  |  |
Maximum [Member] | WSP [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Maximum [Member] | CIVB Risk Management, Inc. [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of intangible assets | 5 years |  |  |
Minimum [Member] | Furniture and Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 3 years |  |  |
Minimum [Member] | Buildings and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 7 years |  |  |

X
- Definition Number of days for demand deposits with financial institutions to be considered cash and cash equivalent. + References No definition available. + Details
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- Definition Par value of Federal Home Loan Bank Stock. + References No definition available. + Details
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- Definition Minimum balance requirement to perform detailed loan review. + References No definition available. + Details
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- Definition Percentage of insurance commission revenue of total revenue. + References No definition available. + Details
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- Definition Represents the number of days past due for loans and leases to be considered nonaccrual. + References No definition available. + Details
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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
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