Borrowings and Subordinated Debentures - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($) |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
|
| Federal Home Loan Banks [Abstract] | ||
| Weighted-average interest rate at end of period | 1.05% | 1.40% |
| Weighted-average interest rate during the period | 1.20% | 1.42% |
| Average balance of FHLB advances | $ 147,897,000 | $ 156,601,000 |
| Maximum amount outstanding at any month-end | $ 150,000,000 | $ 300,000,000 |
| X | ||||||||||
- Definition The calculated average balance outstanding for the year for all Federal Home Loan Bank advances as of the Balance Sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The maximum balance outstanding at any month end during the period as of the Balance Sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|