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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
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)