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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 21,795 | $ 25,021
Available-for-sale, Less than 12 months, Unrealized Losses | (6) | (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 | 21,795 | 47,472
Available-for-sale, Total, Unrealized Losses | (6) | (93)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 86,523 | 67,314
Held-to-maturity, Less than 12 months, Unrealized Losses | (546) | (452)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 46,965 | 151,085
Held-to-maturity, 12 months or longer, Unrealized Losses | (2,680) | (3,457)
Held-to-maturity, Total, Estimated Fair Value | 133,488 | 218,399
Held-to-maturity, Total, Unrealized Losses | (3,226) | (3,909)
Total securities, Less than 12 months, Estimated Fair Value | 108,318 | 92,335
Total securities, Less than 12 months, Unrealized Losses | (552) | (506)
Total securities, 12 months or longer, Estimated Fair Value | 46,965 | 173,536
Total securities, 12 months or longer, Unrealized Losses | (2,680) | (3,496)
Total securities, Estimated Fair Value | 155,283 | 265,871
Total securities, Unrealized Losses | (3,232) | (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 | 13,015 | 17,035
Held-to-maturity, Less than 12 months, Unrealized Losses | (278) | (271)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 43,444 | 52,159
Held-to-maturity, 12 months or longer, Unrealized Losses | (2,605) | (2,358)
Held-to-maturity, Total, Estimated Fair Value | 56,459 | 69,194
Held-to-maturity, Total, Unrealized Losses | (2,883) | (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 | 17,029 | 25,021
Available-for-sale, Less than 12 months, Unrealized Losses | (2) | (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 | 17,029 | 47,472
Available-for-sale, Total, Unrealized Losses | (2) | (93)
Held-to-maturity, Total, Unrealized Losses |  | 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 | 2,823 | 7,308
Held-to-maturity, Less than 12 months, Unrealized Losses | (23) | (58)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 7,509 | 14,531
Held-to-maturity, 12 months or longer, Unrealized Losses | (208) | (150)
Held-to-maturity, Total, Estimated Fair Value | 10,332 | 21,839
Held-to-maturity, Total, Unrealized Losses | (231) | (208)
Collateralized loan obligations |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | 4,766 |
Available-for-sale, Less than 12 months, Unrealized Losses | (4) |
Available-for-sale, 12 months or Longer, Estimated Fair Value | 0 |
Available-for-sale, 12 months or longer, Unrealized Losses | 0 |
Available-for-sale, Total, Estimated Fair Value | 4,766 |
Available-for-sale, Total, Unrealized Losses | (4) |
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 | 10,192 | 9,727
Held-to-maturity, Less than 12 months, Unrealized Losses | (255) | (213)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 35,935 | 37,628
Held-to-maturity, 12 months or longer, Unrealized Losses | (2,397) | (2,208)
Held-to-maturity, Total, Estimated Fair Value | 46,127 | 47,355
Held-to-maturity, Total, Unrealized Losses | (2,652) | (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 | 73,508 | 50,279
Held-to-maturity, Less than 12 months, Unrealized Losses | (268) | (181)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 3,521 | 98,926
Held-to-maturity, 12 months or longer, Unrealized Losses | (75) | (1,099)
Held-to-maturity, Total, Estimated Fair Value | 77,029 | 149,205
Held-to-maturity, Total, Unrealized Losses | (343) | (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 | 24,661 | 6,329
Held-to-maturity, Less than 12 months, Unrealized Losses | (117) | (29)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 669 | 38,641
Held-to-maturity, 12 months or longer, Unrealized Losses | (7) | (495)
Held-to-maturity, Total, Estimated Fair Value | 25,330 | 44,970
Held-to-maturity, Total, Unrealized Losses | (124) | (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 | 39,365 | 13,682
Held-to-maturity, Less than 12 months, Unrealized Losses | (128) | (59)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 939 | 38,568
Held-to-maturity, 12 months or longer, Unrealized Losses | (19) | (434)
Held-to-maturity, Total, Estimated Fair Value | 40,304 | 52,250
Held-to-maturity, Total, Unrealized Losses | (147) | (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 | 5,856 | 30,268
Held-to-maturity, Less than 12 months, Unrealized Losses | (11) | (93)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 207 | 19,828
Held-to-maturity, 12 months or longer, Unrealized Losses | (1) | (119)
Held-to-maturity, Total, Estimated Fair Value | 6,063 | 50,096
Held-to-maturity, Total, Unrealized Losses | (12) | (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 | 3,626 | 0
Held-to-maturity, Less than 12 months, Unrealized Losses | (12) | 0
Held-to-maturity, 12 months or longer, Estimated Fair Value | 1,706 | 1,889
Held-to-maturity, 12 months or longer, Unrealized Losses | (48) | (51)
Held-to-maturity, Total, Estimated Fair Value | 5,332 | 1,889
Held-to-maturity, Total, Unrealized Losses | $ (60) | $ (51)

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