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Borrowings (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 16, 2014 | Jun. 30, 2020 | Dec. 31, 2019 | Mar. 17, 2004
Borrowings |  |  |  |
Advances from Federal Home Loan Banks |  | $ 116,500 | $ 84,000 |
Weighted average interest rate |  | 1.84% | 2.32% |
Weighted average contractual maturity (in months) |  | 31 months | 18 months |
Junior subordinated debentures |  | $ 3,825 | $ 4,335 |
First principal payment |  | $ 1,300 |  |
Floating Rate Junior Subordinated Debentures |  |  |  |
Borrowings |  |  |  |
Effective interest rate on debentures (as a percent) |  | 2.86% |  |
Junior subordinated debentures | $ 5,100 |  |  |
Payment of principal amount at face value required to extend maturity | $ 900 |  |  |
Floating Rate Junior Subordinated Debentures | 3-month LIBOR |  |  |  |
Borrowings |  |  |  |
Interest rate basis |  | 3-Month LIBOR |  |
Basis spread (as a percent) |  | 2.54% |  |
Private Placement | Floating Rate Junior Subordinated Debentures |  |  |  |
Borrowings |  |  |  |
Junior subordinated debentures |  |  |  | $ 6,000
First mortgage loans |  |  |  |
Borrowings |  |  |  |
FHLB advances, collateral real estate loans |  | $ 210,400 | $ 156,100 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: 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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