Borrowings - Additional Information (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
|
| Debt Disclosure [Abstract] | |||||
| Overnight advances from federal home loan banks | $ 0 | $ 0 | $ 15,000,000.0 | ||
| Advances from the FHLB | $ 150,000,000.0 | $ 150,000,000.0 | $ 75,000,000.0 | ||
| Weighted average interest rate of outstanding advances (percent) | 1.40% | 1.40% | 1.71% | ||
| Interest expense on borrowings | $ 582,000 | $ 367,000 | $ 1,838,000 | $ 439,000 | |
| Weighted average interest rate of overnight advances (percent) | 1.66% | ||||
| Outstanding borrowings | 0 | 0 | $ 0 | ||
| Pledged loans receivable, carrying value | 2,270,000,000 | 2,270,000,000 | 1,350,000,000 | ||
| Remaining available borrowing capacity | 1,430,000,000 | 1,430,000,000 | |||
| FHLB statutory lending limit | 1,570,000,000 | 1,570,000,000 | 878,400,000 | ||
| Loans pledged with FRB | 35,000,000.0 | 35,000,000.0 | 30,200,000 | ||
| Borrowing capacity through Fed Discount Window | $ 33,600,000 | $ 33,600,000 | $ 29,600,000 | ||
| X | ||||||||||
- Definition Amount available from borrowing source. No definition available.
|
| X | ||||||||||
- Definition Borrowing. No definition available.
|
| X | ||||||||||
- Definition Borrowing capacity available based on pledged collateral. No definition available.
|
| X | ||||||||||
- Definition Carrying value for loans pledged by bank. No definition available.
|
| X | ||||||||||
- Definition Federal home loan bank advances maturities summary average interest rate one to three years from balance sheet date. No definition available.
|
| X | ||||||||||
- Definition Federal Home Loan Bank, Advances, Maturities Summary, Due Overnight No definition available.
|
| X | ||||||||||
- Definition Federal home loan bank overnight advances weighted average interest rate. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. No definition available.
|
| X | ||||||||||
- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Interest expense incurred during the reporting period on short-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances. No definition available.
|