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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (8,171) $ (685)
Unrealized losses on available for sale securities, 12 months or more (1,611) (2,885)
Total unrealized losses on available for sale securities (9,782) (3,570)
Fair value of unrealized losses on available for sale securities, less than 12 months 898,632 192,720
Fair value of unrealized losses on available for sale securities, 12 months or more 149,402 178,681
Total fair value of unrealized losses on available for sale securities $ 1,048,033 $ 371,400
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 35 27
Available for sale, number of securities, 12 months or more | security 29 16
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (3,154) $ 0
Unrealized losses on held to maturity securities, 12 months or more 0 0
Total unrealized losses on held to maturity securities $ (3,154) $ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 0 0
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 126,218 $ 325
Fair value of unrealized losses on held to maturity securities, 12 months or more 0 0
Total fair value of unrealized losses on held to maturity securities $ 126,218 $ 325
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 41 1
SBA    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ (53)
Unrealized losses on available for sale securities, 12 months or more (57) 0
Total unrealized losses on available for sale securities (57) (53)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 8,379
Fair value of unrealized losses on available for sale securities, 12 months or more 7,750 0
Total fair value of unrealized losses on available for sale securities $ 7,750 $ 8,379
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 0 14
Available for sale, number of securities, 12 months or more | security 14 0
Obligations of state and political subdivisions (municipal securities)    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ 0  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities 0  
Fair value of unrealized losses on available for sale securities, less than 12 months 910  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 910  
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 1  
Available for sale, number of securities, 12 months or more | security 0  
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (994)  
Unrealized losses on held to maturity securities, 12 months or more 0  
Total unrealized losses on held to maturity securities (994)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 62,908  
Fair value of unrealized losses on held to maturity securities, 12 months or more 0  
Total fair value of unrealized losses on held to maturity securities $ 62,908  
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 33  
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 0  
FFELP    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ (129)
Unrealized losses on available for sale securities, 12 months or more (1,554) (2,885)
Total unrealized losses on available for sale securities (1,554) (3,013)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 9,267
Fair value of unrealized losses on available for sale securities, 12 months or more 141,652 178,681
Total fair value of unrealized losses on available for sale securities $ 141,652 $ 187,948
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 0 1
Available for sale, number of securities, 12 months or more | security 15 16
Other Debt securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months   $ 0
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   0
Fair value of unrealized losses on available for sale securities, less than 12 months   2,000
Fair value of unrealized losses on available for sale securities, 12 months or more   0
Total fair value of unrealized losses on available for sale securities   $ 2,000
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security   2
Available for sale, number of securities, 12 months or more | security   0
US Treasury Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (544)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (544)  
Fair value of unrealized losses on available for sale securities, less than 12 months 53,693  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 53,693  
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 5  
Available for sale, number of securities, 12 months or more | security 0  
Agency Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (96)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (96)  
Fair value of unrealized losses on available for sale securities, less than 12 months 14,904  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 14,904  
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 1  
Available for sale, number of securities, 12 months or more | security 0  
FNMA/FHLMC | Residential Related Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (5,647) $ (500)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (5,647) (500)
Fair value of unrealized losses on available for sale securities, less than 12 months 756,359 163,002
Fair value of unrealized losses on available for sale securities, 12 months or more 0 0
Total fair value of unrealized losses on available for sale securities $ 756,359 $ 163,002
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 24 7
Available for sale, number of securities, 12 months or more | security 0 0
FNMA/FHLMC | Commercial mortgage-related securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (1,883)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (1,883)  
Fair value of unrealized losses on available for sale securities, less than 12 months 72,435  
Fair value of unrealized losses on available for sale securities, 12 months or more 0  
Total fair value of unrealized losses on available for sale securities $ 72,435  
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 2  
Available for sale, number of securities, 12 months or more | security 0  
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (2,138)  
Unrealized losses on held to maturity securities, 12 months or more 0  
Total unrealized losses on held to maturity securities (2,138)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 41,105  
Fair value of unrealized losses on held to maturity securities, 12 months or more 0  
Total fair value of unrealized losses on held to maturity securities $ 41,105  
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 6  
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 0  
GNMA | Residential Related Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ (3)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities 0 (3)
Fair value of unrealized losses on available for sale securities, less than 12 months 253 9,784
Fair value of unrealized losses on available for sale securities, 12 months or more 0 0
Total fair value of unrealized losses on available for sale securities $ 253 $ 9,784
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 1 2
Available for sale, number of securities, 12 months or more | security 0 0
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months   $ 0
Unrealized losses on held to maturity securities, 12 months or more   0
Total unrealized losses on held to maturity securities   0
Fair value of unrealized losses on held to maturity securities, less than 12 months   325
Fair value of unrealized losses on held to maturity securities, 12 months or more   0
Total fair value of unrealized losses on held to maturity securities   $ 325
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security   1
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security   0
GNMA | Commercial mortgage-related securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ 0
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities 0 0
Fair value of unrealized losses on available for sale securities, less than 12 months 78 287
Fair value of unrealized losses on available for sale securities, 12 months or more 0 0
Total fair value of unrealized losses on available for sale securities $ 78 $ 287
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 1 1
Available for sale, number of securities, 12 months or more | security 0 0
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (21)  
Unrealized losses on held to maturity securities, 12 months or more 0  
Total unrealized losses on held to maturity securities (21)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 22,205  
Fair value of unrealized losses on held to maturity securities, 12 months or more 0  
Total fair value of unrealized losses on held to maturity securities $ 22,205  
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 2  
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more    
Investment securities HTM    
Number of held to maturity securities in a continuous unrealized loss position | security 0