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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 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 thank 12 months, Estimated Fair Value | $ 4,900 | $ 25,021
Available-for-sale, Less than 12 Months, Unrealized Losses | (4) | (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 | 4,900 | 47,472
Available-for-sale, Total, Unrealized Losses | (4) | (93)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 145,783 | 67,314
Held-to-maturity, Less than 12 months, Unrealized Losses | (3,725) | (452)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 51,025 | 151,085
Held-to-maturity, 12 months or longer, Unrealized Losses | (7,433) | (3,457)
Held-to-maturity, Total, Estimated Fair Value | 196,808 | 218,399
Held-to-maturity, Total, Unrealized Losses | (11,158) | (3,909)
Total securities, Less than 12 months, Estimated Fair Value | 150,683 | 92,335
Total securities, Less than 12 months, Unrealized Losses | (3,729) | (506)
Total securities, 12 months or longer, Estimated Fair Value | 51,025 | 173,536
Total securities, 12 months or longer, Unrealized Losses | (7,433) | (3,496)
Total securities, Estimated Fair Value | 201,708 | 265,871
Total securities, Unrealized Losses | (11,162) | (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 | 58,971 | 17,035
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,775) | (271)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 39,824 | 52,159
Held-to-maturity, 12 months or longer, Unrealized Losses | (7,218) | (2,358)
Held-to-maturity, Total, Estimated Fair Value | 98,795 | 69,194
Held-to-maturity, Total, Unrealized Losses | (8,993) | (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 thank 12 months, Estimated Fair Value | 4,900 | 25,021
Available-for-sale, Less than 12 Months, Unrealized Losses | (4) | (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 | 4,900 | 47,472
Available-for-sale, Total, Unrealized Losses | (4) | (93)
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 | 0
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 | 86,812 | 50,279
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,950) | (181)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 11,201 | 98,926
Held-to-maturity, 12 months or longer, Unrealized Losses | (215) | (1,099)
Held-to-maturity, Total, Estimated Fair Value | 98,013 | 149,205
Held-to-maturity, Total, Unrealized Losses | (2,165) | (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 | 1,653 | 6,329
Held-to-maturity, Less than 12 months, Unrealized Losses | (22) | (29)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 1,772 | 38,641
Held-to-maturity, 12 months or longer, Unrealized Losses | (8) | (495)
Held-to-maturity, Total, Estimated Fair Value | 3,425 | 44,970
Held-to-maturity, Total, Unrealized Losses | (30) | (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 | 20,857 | 13,682
Held-to-maturity, Less than 12 months, Unrealized Losses | (154) | (59)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 444 | 38,568
Held-to-maturity, 12 months or longer, Unrealized Losses | (11) | (434)
Held-to-maturity, Total, Estimated Fair Value | 21,301 | 52,250
Held-to-maturity, Total, Unrealized Losses | (165) | (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 | 15,906 | 30,268
Held-to-maturity, Less than 12 months, Unrealized Losses | (266) | (93)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 7,222 | 19,828
Held-to-maturity, 12 months or longer, Unrealized Losses | (150) | (119)
Held-to-maturity, Total, Estimated Fair Value | 23,128 | 50,096
Held-to-maturity, Total, Unrealized Losses | (416) | (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 | 0 | 0
Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | 0
Held-to-maturity, 12 months or longer, Estimated Fair Value | 1,763 | 1,889
Held-to-maturity, 12 months or longer, Unrealized Losses | (46) | (51)
Held-to-maturity, Total, Estimated Fair Value | 1,763 | 1,889
Held-to-maturity, Total, Unrealized Losses | (46) | (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 | 48,396 |
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,508) |
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 | 48,396 |
Held-to-maturity, Total, Unrealized Losses | (1,508) |
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 | 38,712 | 7,308
Held-to-maturity, Less than 12 months, Unrealized Losses | (247) | (58)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 8,532 | 14,531
Held-to-maturity, 12 months or longer, Unrealized Losses | (178) | (150)
Held-to-maturity, Total, Estimated Fair Value | 47,244 | 21,839
Held-to-maturity, Total, Unrealized Losses | (425) | (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 | 20,259 | 9,727
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,528) | (213)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 31,292 | 37,628
Held-to-maturity, 12 months or longer, Unrealized Losses | (7,040) | (2,208)
Held-to-maturity, Total, Estimated Fair Value | 51,551 | 47,355
Held-to-maturity, Total, Unrealized Losses | $ (8,568) | $ (2,421)

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