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Federal Home Loan Bank and Federal Reserve Bank Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
FHLB Fixed Rate Advances, Maturities Summary [Abstract]      
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One To Five Years From Balance Sheet Date 3.85%    
FHLB Fixed Rate Advances, Over 1 through 5 years $ 2,000    
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Due after 10 years 5.37%    
FHLB Fixed Rate Advances, Due after 10 years $ 5,000    
FHLB Fixed Rate Advances, Total Amount before valuation adjustment 7,000 $ 953,000  
Valuation adjustment from acquisition accounting 414    
FHLB Fixed Rate Advances, Total Amount 7,414    
Federal Home Loan Bank, Advances, Activity for Year [Abstract]      
FHLB Advances 7,414 953,469 $ 399,523
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding 341,643 469,983 166,563
Maximum month-end balance during the year $ 1,005,464 $ 953,469 $ 399,523
Weighted average rate during the year 1.82% 2.42% 2.29%
Weighted average rate at December 31 4.94% 1.84% 2.68%