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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, 2021 | Dec. 31, 2020
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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 | $ 57,192 | $ 21,795
Available-for-sale, less than 12 months, unrealized losses | (48) | (6)
Available-for-sale, 12 months or longer, estimated fair value | 0 | 0
Available-for-sale, 12 months or longer, unrealized losses | 0 | 0
Available-for-sale, total, estimated fair value | 57,192 | 21,795
Available-for-sale, total, unrealized losses | (48) | (6)
Held-to-maturity, less than 12 months, estimated fair value | 419,591 | 86,523
Held-to-maturity, less than 12 months, unrealized losses | (8,391) | (546)
Held-to-maturity, 12 months or longer, estimated fair value | 12,975 | 46,965
Held-to-maturity, 12 months or longer, unrealized losses | (367) | (2,680)
Held-to-maturity, total, estimated fair value | 432,566 | 133,488
Held-to-maturity, total, unrealized losses | (8,758) | (3,226)
Total securities, less than 12 months, estimated fair value | 476,783 | 108,318
Total securities, less than 12 months, unrealized losses | (8,439) | (552)
Total securities, 12 months or longer, estimated fair value | 12,975 | 46,965
Total securities, 12 months or longer, unrealized losses | (367) | (2,680)
Total securities, estimated fair value | 489,758 | 155,283
Total securities, unrealized losses | (8,806) | (3,232)
U.S. government and agency obligations | Securities investment |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, less than 12 months, estimated fair value | 10,139 | 17,029
Available-for-sale, less than 12 months, unrealized losses | (8) | (2)
Available-for-sale, 12 months or longer, estimated fair value | 0 | 0
Available-for-sale, 12 months or longer, unrealized losses | 0 | 0
Available-for-sale, total, estimated fair value | 10,139 | 17,029
Available-for-sale, total, unrealized losses | (8) | (2)
CLOs |  |
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)
CLOs | Securities investment |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, less than 12 months, estimated fair value | 47,053 |
Available-for-sale, less than 12 months, unrealized losses | (40) |
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 | 47,053 |
Available-for-sale, total, unrealized losses | (40) |
State, municipal and sovereign debt obligations | Securities investment |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 50,696 | 2,823
Held-to-maturity, less than 12 months, unrealized losses | (890) | (23)
Held-to-maturity, 12 months or longer, estimated fair value | 5,748 | 7,509
Held-to-maturity, 12 months or longer, unrealized losses | (216) | (208)
Held-to-maturity, total, estimated fair value | 56,444 | 10,332
Held-to-maturity, total, unrealized losses | (1,106) | (231)
Corporate debt securities | Securities investment |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 39,041 | 10,192
Held-to-maturity, less than 12 months, unrealized losses | (1,774) | (255)
Held-to-maturity, 12 months or longer, estimated fair value | 3,818 | 35,935
Held-to-maturity, 12 months or longer, unrealized losses | (138) | (2,397)
Held-to-maturity, total, estimated fair value | 42,859 | 46,127
Held-to-maturity, total, unrealized losses | (1,912) | (2,652)
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 | 329,854 | 73,508
Held-to-maturity, less than 12 months, unrealized losses | (5,727) | (268)
Held-to-maturity, 12 months or longer, estimated fair value | 3,409 | 3,521
Held-to-maturity, 12 months or longer, unrealized losses | (13) | (75)
Held-to-maturity, total, estimated fair value | 333,263 | 77,029
Held-to-maturity, total, unrealized losses | (5,740) | (343)
Mortgage-backed securities - FNMA | FHLMC |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 158,632 | 24,661
Held-to-maturity, less than 12 months, unrealized losses | (3,178) | (117)
Held-to-maturity, 12 months or longer, estimated fair value | 0 | 669
Held-to-maturity, 12 months or longer, unrealized losses | 0 | (7)
Held-to-maturity, total, estimated fair value | 158,632 | 25,330
Held-to-maturity, total, unrealized losses | (3,178) | (124)
Mortgage-backed securities - FNMA | FNMA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 163,103 | 39,365
Held-to-maturity, less than 12 months, unrealized losses | (2,478) | (128)
Held-to-maturity, 12 months or longer, estimated fair value | 293 | 939
Held-to-maturity, 12 months or longer, unrealized losses | (3) | (19)
Held-to-maturity, total, estimated fair value | 163,396 | 40,304
Held-to-maturity, total, unrealized losses | (2,481) | (147)
Mortgage-backed securities - FNMA | GNMA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 6,104 | 5,856
Held-to-maturity, less than 12 months, unrealized losses | (23) | (11)
Held-to-maturity, 12 months or longer, estimated fair value | 0 | 207
Held-to-maturity, 12 months or longer, unrealized losses | 0 | (1)
Held-to-maturity, total, estimated fair value | 6,104 | 6,063
Held-to-maturity, total, unrealized losses | (23) | (12)
Mortgage-backed securities - FNMA | SBA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 2,015 | 3,626
Held-to-maturity, less than 12 months, unrealized losses | (48) | (12)
Held-to-maturity, 12 months or longer, estimated fair value | 3,116 | 1,706
Held-to-maturity, 12 months or longer, unrealized losses | (10) | (48)
Held-to-maturity, total, estimated fair value | 5,131 | 5,332
Held-to-maturity, total, unrealized losses | $ (58) | $ (60)

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