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Debt (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Maturity of federal funds purchased from correspondent banks one business day  
Real estate secured loans $ 1,359,150,000  
Current borrowing available 573,941,000  
Maximum borrowing capacity 948,646,000  
Long-term debt outstanding 74,681,000 $ 81,270,000
FHLB [Member]    
Debt Instrument [Line Items]    
Letter of credit outstanding, amount $ 301,450,000 450,850,000
Paycheck Protection Program Liquidity Facility    
Debt Instrument [Line Items]    
Short-term borrowings, term five years  
Short-term borrowings, interest Rate 0.35%  
Other Correspondent Banks [Member]    
Debt Instrument [Line Items]    
Outstanding drawings $ 0 0
Line of credit facility, remaining borrowing capacity 35,000,000  
Short term borrowings 0 0
FHLB Short-Term Borrowings [Member]    
Debt Instrument [Line Items]    
Outstanding drawings $ 0 $ 0