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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
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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 |

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