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Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Balance at year end $ 32,199,000 $ 23,745,000
Average daily balance during the year $ 32,912,000 $ 22,798,000
Average interest rate during the year 0.61% 0.84%
Maximum month-end balance during the year $ 40,282,000 $ 30,273,000
Weighted average interest rate at year-end 0.47% 0.89%
Percentage of fair value of securities pledged of the outstanding balance of repurchase agreement 1  
Borrowings outstanding under line of credit as federal funds purchased $ 0 $ 0
Federal Funds Purchased    
Assets Sold under Agreements to Repurchase [Line Items]    
Line of credit $ 335,000,000 $ 305,000,000