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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, 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 | $ 155,940 | $ 21,795
Available-for-sale, less than 12 months, unrealized losses | (669) | (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 | 155,940 | 21,795
Available-for-sale, total, unrealized losses | (669) | (6)
Held-to-maturity, less than 12 months, estimated fair value | 524,085 | 86,523
Held-to-maturity, less than 12 months, unrealized losses | (6,527) | (546)
Held-to-maturity, 12 months or longer, estimated fair value | 19,496 | 46,965
Held-to-maturity, 12 months or longer, unrealized losses | (301) | (2,680)
Held-to-maturity, total, estimated fair value | 543,581 | 133,488
Held-to-maturity, total, unrealized losses | (6,828) | (3,226)
Total securities, less than 12 months, estimated fair value | 680,025 | 108,318
Total securities, less than 12 months, unrealized losses | (7,196) | (552)
Total securities, 12 months or longer, estimated fair value | 19,496 | 46,965
Total securities, 12 months or longer, unrealized losses | (301) | (2,680)
Total securities, estimated fair value | 699,521 | 155,283
Total securities, unrealized losses | (7,497) | (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 | 25,911 | 17,029
Available-for-sale, less than 12 months, unrealized losses | (136) | (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 | 25,911 | 17,029
Available-for-sale, total, unrealized losses | (136) | (2)
Corporate debt securities | 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 | 997 |
Available-for-sale, less than 12 months, unrealized losses | (3) |
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 | 997 |
Available-for-sale, total, unrealized losses | (3) |
Held-to-maturity, less than 12 months, estimated fair value | 39,573 | 10,192
Held-to-maturity, less than 12 months, unrealized losses | (1,273) | (255)
Held-to-maturity, 12 months or longer, estimated fair value | 0 | 35,935
Held-to-maturity, 12 months or longer, unrealized losses | 0 | (2,397)
Held-to-maturity, total, estimated fair value | 39,573 | 46,127
Held-to-maturity, total, unrealized losses | (1,273) | (2,652)
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 | 420,209 | 73,508
Held-to-maturity, less than 12 months, unrealized losses | (4,646) | (268)
Held-to-maturity, 12 months or longer, estimated fair value | 18,585 | 3,521
Held-to-maturity, 12 months or longer, unrealized losses | (279) | (75)
Held-to-maturity, total, estimated fair value | 438,794 | 77,029
Held-to-maturity, total, unrealized losses | (4,925) | (343)
Mortgage-backed securities: | 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 | 11,555 |
Available-for-sale, less than 12 months, unrealized losses | (150) |
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 | 11,555 |
Available-for-sale, total, unrealized losses | (150) |
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 | 242,215 | 24,661
Held-to-maturity, less than 12 months, unrealized losses | (2,823) | (117)
Held-to-maturity, 12 months or longer, estimated fair value | 4,102 | 669
Held-to-maturity, 12 months or longer, unrealized losses | (58) | (7)
Held-to-maturity, total, estimated fair value | 246,317 | 25,330
Held-to-maturity, total, unrealized losses | (2,881) | (124)
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 | 171,450 | 39,365
Held-to-maturity, less than 12 months, unrealized losses | (1,776) | (128)
Held-to-maturity, 12 months or longer, estimated fair value | 8,647 | 939
Held-to-maturity, 12 months or longer, unrealized losses | (188) | (19)
Held-to-maturity, total, estimated fair value | 180,097 | 40,304
Held-to-maturity, total, unrealized losses | (1,964) | (147)
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 | 458 | 5,856
Held-to-maturity, less than 12 months, unrealized losses | (3) | (11)
Held-to-maturity, 12 months or longer, estimated fair value | 4,867 | 207
Held-to-maturity, 12 months or longer, unrealized losses | (31) | (1)
Held-to-maturity, total, estimated fair value | 5,325 | 6,063
Held-to-maturity, total, unrealized losses | (34) | (12)
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 | 1,602 | 3,626
Held-to-maturity, less than 12 months, unrealized losses | (41) | (12)
Held-to-maturity, 12 months or longer, estimated fair value | 969 | 1,706
Held-to-maturity, 12 months or longer, unrealized losses | (2) | (48)
Held-to-maturity, total, estimated fair value | 2,571 | 5,332
Held-to-maturity, total, unrealized losses | (43) | (60)
Mortgage-backed securities: | Other |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 months, estimated fair value | 4,484 |
Held-to-maturity, less than 12 months, unrealized losses | (3) |
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 | 4,484 |
Held-to-maturity, total, unrealized losses | (3) | 0
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 | 117,477 |
Available-for-sale, less than 12 months, unrealized losses | (380) |
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 | 117,477 |
Available-for-sale, total, unrealized losses | (380) |
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 | 64,303 | 2,823
Held-to-maturity, less than 12 months, unrealized losses | (608) | (23)
Held-to-maturity, 12 months or longer, estimated fair value | 911 | 7,509
Held-to-maturity, 12 months or longer, unrealized losses | (22) | (208)
Held-to-maturity, total, estimated fair value | 65,214 | 10,332
Held-to-maturity, total, unrealized losses | $ (630) | $ (231)

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