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Subordinated Debt - Additional Information (Detail) - Subordinated debt [Member] - USD ($) | 1 Months Ended
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May 28, 2020 | Nov. 20, 2015
Subordinated Borrowing [Line Items] |  |
Subordinated debt instrument face value | $ 15,000,000 | $ 10,000,000
Subordinated debt instrument maturity date | Jun. 01, 2030 | Dec. 01, 2025
Subordinated debt interest rate terms | The 2020 Note bears interest, payable on the 1st of June and December of each year, commencing December 1, 2020, at a fixed rate of 6.00% per year for the first five years, and thereafter will bear a floating interest rate of SOFR plus 587 basis points. | The Notes bear interest, payable on the 1st of June and December of each year, commencing June 1, 2016, at a fixed rate of 6.75% per year for the first five years, and thereafter will bear a floating interest rate of LIBOR plus 512.8 basis points.
Subordinated debt instrument fixed rate of interest | 6.00% | 6.75%
Subordinated debt instrument call feature | The Company has the right to redeem the 2020 Note, in whole or in part, without premium or penalty, at any interest payment date on or after June 1, 2025 and prior to the maturity date, but in all cases in a principal amount with integral multiples of $1,000, plus interest accrued and unpaid through the date of redemption | The Company has the right to redeem the 2015 Notes, in whole or in part, without premium or penalty, at any interest payment date on or after December 1, 2020 and prior to the maturity date, but in all cases in a principal amount with integral multiples of $1,000, plus interest accrued and unpaid through the date of redemption
Subordinated debt instrument date of first required payment | Dec. 01, 2020 | Jun. 01, 2016
Subordinate debt principal amount with interest accrued | $ 1,000 | $ 1,000
Subordinated debt issuance costs | $ 687,500 | $ 687,500
LIBOR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debt instrument variable interest rate spread |  | 512.80%
SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debt instrument variable interest rate spread | 587.00% |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Date the payments are due on subordinated debt, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
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