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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 29 7
Greater than 12 months in an unrealized loss position | security 9 13
Total 38 20
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 825,000 $ 313,000
Greater than 12 months in an unrealized loss position 892,000 2,205,000
Total 1,717,000 2,518,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 159,561,000 16,002,000
Greater than 12 months in an unrealized loss position 31,020,000 81,285,000
Total 190,581,000 $ 97,287,000
Credit losses were determined 0  
Provision for credit losses on securities $ 0  
US Government Corporations and Agencies Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2  
Greater than 12 months in an unrealized loss position | security 4 4
Total 6 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 229,000  
Greater than 12 months in an unrealized loss position 111,000 $ 154,000
Total 340,000 154,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 28,066,000  
Greater than 12 months in an unrealized loss position 5,509,000 6,657,000
Total $ 33,575,000 $ 6,657,000
Mortgage Backed Securities, Issued by US Government Agencies [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 6 1
Total 6 1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 215,000 $ 1,000
Total 215,000 1,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 6,084,000 141,000
Total $ 6,084,000 $ 141,000
US States and Political Subdivisions Debt Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2  
Greater than 12 months in an unrealized loss position | security 1 1
Total 3 1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 23,000  
Greater than 12 months in an unrealized loss position 616,000 $ 1,362,000
Total 639,000 1,362,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,490,000  
Greater than 12 months in an unrealized loss position 4,085,000 3,433,000
Total $ 5,575,000 $ 3,433,000
Corporate Bond Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1  
Total | security 1  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 8,000  
Total 8,000  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,992,000  
Total $ 4,992,000  
Collateralized Mortgage Obligations [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 7 4
Greater than 12 months in an unrealized loss position | security 1 1
Total 8 5
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 244,000 $ 279,000
Greater than 12 months in an unrealized loss position 64,000 1,000
Total 308,000 280,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 63,495,000 8,142,000
Greater than 12 months in an unrealized loss position 7,531,000 146,000
Total $ 71,026,000 $ 8,288,000
Asset-backed Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 1
Greater than 12 months in an unrealized loss position | security 1 3
Total 6 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 79,000 $ 2,000
Greater than 12 months in an unrealized loss position 54,000 509,000
Total 133,000 511,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 35,048,000 251,000
Greater than 12 months in an unrealized loss position 3,270,000 49,572,000
Total $ 38,318,000 $ 49,823,000
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 6 1
Greater than 12 months in an unrealized loss position | security 2 4
Total 8 5
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 27,000 $ 31,000
Greater than 12 months in an unrealized loss position 47,000 179,000
Total 74,000 210,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 20,386,000 7,468,000
Greater than 12 months in an unrealized loss position 10,625,000 21,477,000
Total $ 31,011,000 $ 28,945,000