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Benefit Plans - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 20, 2019 | Dec. 31, 2017 USD ($) | Sep. 30, 2015 USD ($) | Feb. 28, 2014 USD ($) | Dec. 31, 2019 USD ($) security employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Benefit Plans [Line Items] |  |  |  |  |  |  |
Eligibility to participate in ESOP based on service |  |  |  |  | 6 months |  |
Eligibility age to participate in ESOP |  |  |  |  | 21 years |  |
Contributions for the plan necessary to amortize the debt to the company, period |  |  |  |  | 20 years |  |
Compensation cost related to ESOP |  |  |  |  | $ 1,085 | $ 1,345 | $ 1,262
Fair value of the unearned ESOP shares |  |  |  |  | $ 12,245 | 12,324 |
401 (k) and Profit Sharing Plan |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Percent of employee's pretax annual earnings allowed to be contributed into the plan (percent) |  |  |  |  | 75.00% |  |
Employer matching contribution as percentage of employee contributions made on first 2% of employee's pay (percent) |  |  |  |  | 100.00% |  |
Percent of employee's pay to be matched by employer (percent) |  |  |  |  | 2.00% |  |
Additional employer matching contribution on employee contributions between 2% and 6% (percent) |  |  |  |  | 50.00% |  |
Contributions made by company, amount |  |  |  |  | $ 919 | 872 | $ 701
401 (k) and Profit Sharing Plan | Maximum |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Percent of employee's pay to be matched by employer (percent) |  |  |  |  | 6.00% |  |
Salary Continuation Agreements |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Post retirement liability outstanding |  |  |  |  | $ 3,227 | $ 3,124 |
2007 Salary Continuation Agreements |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Number of employees covered | employee |  |  |  |  | 4 |  |
2007 Salary Continuation Agreements | Chief Executive Officer |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Period of stated annual benefit |  |  |  |  | 10 years |  |
Vested period |  |  |  |  | 10 years |  |
Percent of period vested (percent) |  |  |  |  | 100.00% |  |
2007 Salary Continuation Agreements | Chief Credit Officer |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Period of stated annual benefit |  |  |  |  | 10 years |  |
Period for which executive's beneficiary will receive upon death |  |  |  |  | 120 months |  |
Age after which employees will be entitled to a stated annual benefit |  |  |  |  | 65 years |  |
Period of separation from service |  |  |  |  | 24 months |  |
Delay in periods |  |  |  |  | 6 months |  |
2007 Salary Continuation Agreements | Former executive | American Bank |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Contribution to salary agreement |  | $ 358 |  |  |  |  |
Payment period |  | 14 years |  |  |  |  |
2019 Salary Continuation Agreements | Chief Executive Officer |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Period of stated annual benefit | 10 years |  |  |  |  |  |
Percent of period vested (percent) | 100.00% |  |  |  |  |  |
Age after which employees will be entitled to a stated annual benefit | 65 years |  |  |  |  |  |
2019 Salary Continuation Agreements | Chief Financial Officer |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Period of stated annual benefit | 10 years |  |  |  |  |  |
Vested period | 10 years |  |  |  |  |  |
Age after which employees will be entitled to a stated annual benefit | 65 years |  |  |  |  |  |
Period of separation from service | 24 months |  |  |  |  |  |
2014 Salary Continuation Agreements | Former executive | Britton & Koontz |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Contribution to salary agreement |  |  |  | $ 465 |  |  |
Payment period |  |  |  | 15 years |  |  |
2015 Salary Continuation Agreements | Louisiana Bancorp, Inc. |  |  |  |  |  |  |
Benefit Plans [Line Items] |  |  |  |  |  |  |
Contribution to salary agreement |  |  | $ 1,200 |  |  |  |
Number of salary continuation agreements | security |  |  |  |  | 2 |  |
Stated annual benefit for executive |  |  | 10 years |  |  |  |

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- Definition The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79708-111665 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of unearned shares for all classes of common stock and nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by an employee stock ownership plan (ESOP). Includes the sale of shares or the issuance treasury shares to an ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6418591&loc=d3e17344-113926 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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