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Securities - Unrealized Loss Positions (Details)
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position 7 19
Greater than 12 months in an unrealized loss position 13 15
Total 20 34
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 313,000 $ 2,602,000
Greater than 12 months in an unrealized loss position 2,205,000 1,181,000
Total 2,518,000 3,783,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 16,002,000 129,582,000
Greater than 12 months in an unrealized loss position 81,285,000 45,240,000
Total $ 97,287,000 $ 174,822,000
US Government Corporations and Agencies Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Greater than 12 months in an unrealized loss position 4 4
Total 4 4
Securities Available-for-Sale, Unrealized Losses    
Greater than 12 months in an unrealized loss position $ 154,000 $ 165,000
Total 154,000 165,000
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 6,657,000 8,337,000
Total $ 6,657,000 $ 8,337,000
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 1 3
Greater than 12 months in an unrealized loss position   2
Total 1 5
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 1,000 $ 10,000
Greater than 12 months in an unrealized loss position   9,000
Total 1,000 19,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 141,000 3,018,000
Greater than 12 months in an unrealized loss position   843,000
Total $ 141,000 $ 3,861,000
US States and Political Subdivisions Debt Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position   6
Greater than 12 months in an unrealized loss position 1 2
Total 1 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 1,665,000
Greater than 12 months in an unrealized loss position $ 1,362,000 766,000
Total 1,362,000 2,431,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position   41,043,000
Greater than 12 months in an unrealized loss position 3,433,000 6,593,000
Total $ 3,433,000 $ 47,636,000
Collateralized Mortgage Obligations [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position 4 2
Greater than 12 months in an unrealized loss position 1 2
Total 5 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 279,000 $ 26,000
Greater than 12 months in an unrealized loss position 1,000 12,000
Total 280,000 38,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 8,142,000 9,054,000
Greater than 12 months in an unrealized loss position 146,000 1,209,000
Total $ 8,288,000 $ 10,263,000
Asset-backed Securities [Member]    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position 1 4
Greater than 12 months in an unrealized loss position 3 1
Total 4 5
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,000 $ 839,000
Greater than 12 months in an unrealized loss position 509,000 48,000
Total 511,000 887,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 251,000 54,540,000
Greater than 12 months in an unrealized loss position 49,572,000 3,238,000
Total $ 49,823,000 $ 57,778,000
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position 1 4
Greater than 12 months in an unrealized loss position 4 4
Total 5 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 31,000 $ 62,000
Greater than 12 months in an unrealized loss position 179,000 181,000
Total 210,000 243,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 7,468,000 21,927,000
Greater than 12 months in an unrealized loss position 21,477,000 25,020,000
Total $ 28,945,000 $ 46,947,000