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Investment Securities Other Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reported Value Measurement [Member]      
Investment [Line Items]      
FHLB stock $ 21,718,000 $ 27,235,000  
FRB stock 13,311,000 13,310,000  
Other investment securities 37,261,000 42,409,000  
Reported Value Measurement [Member] | Other Security Investments [Member]      
Investment [Line Items]      
Other investment securities 365,000 365,000  
Reported Value Measurement [Member] | Equity Method Investments      
Investment [Line Items]      
Other investment securities 0 0  
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity 0    
Other investment securities 37,560,000 42,730,000  
Trading Securities, Change in Unrealized Holding Gain (Loss) 19,000,000 44,000,000  
Gain (Loss) on Sale of Equity Investments 680,000 787,000,000 $ 413,000,000
Proceeds from Sale of Federal Home Loan Bank Stock 10,500,000 4,900,000  
Payments to Acquire Federal Home Loan Bank Stock 5,000,000.0    
FIRST PRESTONSBURG BANCSHARES INC. [Member]      
Investment [Line Items]      
FRB stock   2,800,000  
Equity investment securities (a)      
Investment [Line Items]      
Other investment securities 299,000 321,000  
Nonqualified Plan [Member] | Reported Value Measurement [Member]      
Investment [Line Items]      
Other investment securities 1,867,000 1,499,000  
Other [Member] | Reported Value Measurement [Member]      
Investment [Line Items]      
Other investment securities $ 365,000 $ 365,000