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Federal Home Loan Bank Advances - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Advances from FHLB | $ 125,000 | $ 5,000
Maturities, from | 2029-05 |
Maturities, to | 2029-10 |
Outstanding letters of credit with FHLB | $ 20,000 | 20,000
FHLB borrowings collateralized by residential mortgage loans | 369,750 | $ 320,400
FHLB maximum borrowing capacity | 564,516 |
FHLB remaining borrowing capacity | $ 318,016 |
Minimum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Maturities from May 2029 through October 2029, fixed rates | 1.03% |
Maximum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Maturities from May 2029 through October 2029, fixed rates | 2.05% |
Weighted Average [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Maturities from May 2029 through October 2029, fixed rates | 1.44% |

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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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