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Borrowed Funds (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Federal Home Loan Bank Collateral Amount for Advances $ 1,600,000  
Federal Reserve Bank Amount of Loans Pledged For Line of Credit 514,000  
Federal Funds Purchased 146 $ 146
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Additional borrowings available from the FHLB 982,200  
Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit 6,000  
Line of Credit [Member] | Federal Reserve Bank Advances [Member]    
Debt Instrument [Line Items]    
Line of credit $ 279,500