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Employee Thrift and Defined Benefit Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer identification number | 35-1562417 |  |
Employee Thrift Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Bank's expense related to the thrift plan | $ 1,200,000 | $ 1,200,000 | $ 942,000
Thrift Plan owns outstanding shares | 741,650 |  |
Percentage of outstanding shares owns with thrift plan | 1.60% |  |
Pentegra Defined Benefit Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Bank's expense related to the thrift plan | $ 0 | $ 0 |
Pentegra Plan date | Aug. 01, 2007 |  |
Employer identification number | 13-5645888 |  |
Plan number | 333 |  |
Withdrawal liability | $ 3,100,000 |  |

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details
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- Definition Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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