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Investment Securities Other Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Other Investments Carrying Value [Line Items]          
Other investment securities $ 32,584,000   $ 32,584,000   $ 37,560,000
Proceeds from Sale of Federal Home Loan Bank Stock 5,200,000        
Trading Securities, Change in Unrealized Holding Gain (Loss) 42,000,000 $ 16,000,000 73,000,000 $ 15,000,000  
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity 0   0    
Reported Value Measurement [Member]          
Other Investments Carrying Value [Line Items]          
Federal Home Loan Bank Stock 16,523,000   16,523,000   21,718,000
Federal Reserve Bank ("FRB") stock 13,311,000   13,311,000   13,311,000
Other investment securities 32,212,000   32,212,000   37,261,000
Reported Value Measurement [Member] | Other Security Investments [Member]          
Other Investments Carrying Value [Line Items]          
Other investment securities 365,000   365,000   365,000
Other | Reported Value Measurement [Member]          
Other Investments Carrying Value [Line Items]          
Other investment securities 365,000   365,000   365,000
Nonqualified Plan [Member] | Reported Value Measurement [Member]          
Other Investments Carrying Value [Line Items]          
Other investment securities 2,013,000   2,013,000   1,867,000
Equity investment securities (a)          
Other Investments Carrying Value [Line Items]          
Other investment securities $ 372,000   $ 372,000   $ 299,000