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Employee Thrift and Defined Benefit Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Thrift Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Bank's expense related to the thrift plan | $ 942,000 | $ 785,000 | $ 848,000
Thrift Plan owns outstanding shares | 497,948 |  |
Percentage of outstanding shares owns with thrift plan | 1.90% |  |
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 | 135645888 |  |
Plan number | 333 |  |
Withdrawal liability | $ 3,400,000 |  |

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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 12b -Subsection 1 + Details
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