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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, less than 12 months, estimated fair value $ 17,060 $ 25,021
Available-for-sale, less than 12 months, unrealized losses (3) (54)
Available-for-sale, 12 months or longer, estimated fair value 0 22,451
Available-for-sale, 12 months or longer, unrealized losses 0 (39)
Available-for-sale, total, estimated fair value 17,060 47,472
Available-for-sale, total, unrealized losses (3) (93)
Held-to-maturity, less than 12 months, estimated fair value 93,761 67,314
Held-to-maturity, less than 12 months, unrealized losses (755) (452)
Held-to-maturity, 12 months or longer, estimated fair value 45,684 151,085
Held-to-maturity, 12 months or longer, unrealized losses (3,689) (3,457)
Held-to-maturity, total, estimated fair value 139,445 218,399
Held-to-maturity, total, unrealized losses (4,444) (3,909)
Total securities, less than 12 months, estimated fair value 110,821 92,335
Total securities, less than 12 months, unrealized losses (758) (506)
Total securities, 12 months or longer, estimated fair value 45,684 173,536
Total securities, 12 months or longer, unrealized losses (3,689) (3,496)
Total securities, estimated fair value 156,505 265,871
Total securities, unrealized losses (4,447) (4,002)
Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 13,064 17,035
Held-to-maturity, less than 12 months, unrealized losses (476) (271)
Held-to-maturity, 12 months or longer, estimated fair value 42,282 52,159
Held-to-maturity, 12 months or longer, unrealized losses (3,616) (2,358)
Held-to-maturity, total, estimated fair value 55,346 69,194
Held-to-maturity, total, unrealized losses (4,092) (2,629)
U.S. government and agency obligations | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, less than 12 months, estimated fair value 17,060 25,021
Available-for-sale, less than 12 months, unrealized losses (3) (54)
Available-for-sale, 12 months or longer, estimated fair value 0 22,451
Available-for-sale, 12 months or longer, unrealized losses 0 (39)
Available-for-sale, total, estimated fair value 17,060 47,472
Available-for-sale, total, unrealized losses (3) (93)
Held-to-maturity, total, unrealized losses 0 0
State and municipal obligations | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 3,635 7,308
Held-to-maturity, less than 12 months, unrealized losses (42) (58)
Held-to-maturity, 12 months or longer, estimated fair value 7,383 14,531
Held-to-maturity, 12 months or longer, unrealized losses (183) (150)
Held-to-maturity, total, estimated fair value 11,018 21,839
Held-to-maturity, total, unrealized losses (225) (208)
Corporate debt securities | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 9,429 9,727
Held-to-maturity, less than 12 months, unrealized losses (434) (213)
Held-to-maturity, 12 months or longer, estimated fair value 34,899 37,628
Held-to-maturity, 12 months or longer, unrealized losses (3,433) (2,208)
Held-to-maturity, total, estimated fair value 44,328 47,355
Held-to-maturity, total, unrealized losses (3,867) (2,421)
Mortgage-backed securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 80,697 50,279
Held-to-maturity, less than 12 months, unrealized losses (279) (181)
Held-to-maturity, 12 months or longer, estimated fair value 3,402 98,926
Held-to-maturity, 12 months or longer, unrealized losses (73) (1,099)
Held-to-maturity, total, estimated fair value 84,099 149,205
Held-to-maturity, total, unrealized losses (352) (1,280)
Mortgage-backed securities | FHLMC    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 31,267 6,329
Held-to-maturity, less than 12 months, unrealized losses (127) (29)
Held-to-maturity, 12 months or longer, estimated fair value 965 38,641
Held-to-maturity, 12 months or longer, unrealized losses (8) (495)
Held-to-maturity, total, estimated fair value 32,232 44,970
Held-to-maturity, total, unrealized losses (135) (524)
Mortgage-backed securities | FNMA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 39,572 13,682
Held-to-maturity, less than 12 months, unrealized losses (127) (59)
Held-to-maturity, 12 months or longer, estimated fair value 485 38,568
Held-to-maturity, 12 months or longer, unrealized losses (14) (434)
Held-to-maturity, total, estimated fair value 40,057 52,250
Held-to-maturity, total, unrealized losses (141) (493)
Mortgage-backed securities | GNMA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 6,008 30,268
Held-to-maturity, less than 12 months, unrealized losses (14) (93)
Held-to-maturity, 12 months or longer, estimated fair value 228 19,828
Held-to-maturity, 12 months or longer, unrealized losses (2) (119)
Held-to-maturity, total, estimated fair value 6,236 50,096
Held-to-maturity, total, unrealized losses (16) (212)
Mortgage-backed securities | SBA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 3,850 0
Held-to-maturity, less than 12 months, unrealized losses (11) 0
Held-to-maturity, 12 months or longer, estimated fair value 1,724 1,889
Held-to-maturity, 12 months or longer, unrealized losses (49) (51)
Held-to-maturity, total, estimated fair value 5,574 1,889
Held-to-maturity, total, unrealized losses (60) $ (51)
Mortgage-backed securities | CMO    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, less than 12 months, estimated fair value 0  
Held-to-maturity, less than 12 months, unrealized losses 0  
Held-to-maturity, 12 months or longer, estimated fair value 0  
Held-to-maturity, 12 months or longer, unrealized losses 0  
Held-to-maturity, total, estimated fair value 0  
Held-to-maturity, total, unrealized losses $ 0