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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Short-Term Borrowings (Details) [Line Items]    
Repurchase agreements securities $ 12,945 $ 15,184
Mortgage-backed Securities Held-to-maturity, Fair Value Disclosure 15,000 14,800
Retail repurchase agreements total amount 12,900  
Purchases of federal funds 41,000  
Retail Repurchase Agreements [Member]    
Short-Term Borrowings (Details) [Line Items]    
Repurchase agreements securities $ 4,500 3,100
Mortgage-backed securities maturity, basis of allocation description This collateral has maturities from 2022 through 2044.  
Maximum amount of outstanding agreements at any month-end $ 22,700 18,300
Monthly average of such agreements totaled $ 15,300 $ 16,500
Short-term borrowings mature The retail repurchase agreements mature within one month.