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Other Borrowings - FHLB Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Credit facility with the FHLB $ 945,200  
Advances outstanding   $ 0
FHLB Advances:    
Average balance during the year 11,898 33,913
Maximum month-end balance during the year $ 90,700 $ 154,500
Weighted average rate during the year 2.57% 1.98%
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%