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Investment Securities - Unrealized Losses (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Less than 12 months $ 11,496,000 $ 28,360,000
12 months or more 1,229,000 52,658,000
Total 12,725,000 81,018,000
Unrealized Losses    
Less than 12 months (68,000) (206,000)
12 months or more (257,000) (592,000)
Total (325,000) (798,000)
U.S. Treasury    
Fair Value    
Less than 12 months 1,015,000  
Total 1,015,000  
U.S government agency obligations    
Fair Value    
Less than 12 months   6,238,000
12 months or more   1,809,000
Total   8,047,000
Unrealized Losses    
Less than 12 months   (69,000)
12 months or more   (8,000)
Total   (77,000)
U.S. government-sponsored enterprises    
Fair Value    
Less than 12 months   5,949,000
12 months or more   7,488,000
Total   13,437,000
Unrealized Losses    
Less than 12 months   (47,000)
12 months or more   (11,000)
Total   (58,000)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months   10,729,000
12 months or more   1,931,000
Total   12,660,000
Unrealized Losses    
Less than 12 months   (53,000)
12 months or more   (6,000)
Total   (59,000)
Mortgage-backed securities    
Fair Value    
Less than 12 months 7,494,000 5,444,000
12 months or more   40,120,000
Total 7,494,000 45,564,000
Unrealized Losses    
Less than 12 months (54,000) (37,000)
12 months or more   (391,000)
Total (54,000) (428,000)
Other debt securities    
Fair Value    
Less than 12 months 2,987,000  
Total 2,987,000  
Unrealized Losses    
Less than 12 months (14,000)  
Total (14,000)  
Bank issued trust preferred securities    
Fair Value    
12 months or more 1,229,000 1,310,000
Total 1,229,000 1,310,000
Unrealized Losses    
12 months or more (257,000) (176,000)
Total $ (257,000) $ (176,000)