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Other Borrowings - FHLB Advances (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Advances from Federal Home Loan Banks [Abstract]    
Average balance during the year $ 1,466,000 $ 11,899,000
Maximum month-end balance during the year $ 0 $ 90,700,000
Weighted average rate during the year 0.55% 2.57%
Federal Home Loan Bank, Advances [Line Items]    
Credit facility with the FHLB $ 991,700,000  
Advances outstanding $ 0 $ 0
Minimum    
Federal Home Loan Bank, Advances [Line Items]    
Unencumbered collateral in amount equal to varying percentages 100.00%  
Maximum    
Federal Home Loan Bank, Advances [Line Items]    
Unencumbered collateral in amount equal to varying percentages 160.00%