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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (4,143) $ (685)
Unrealized losses on available for sale securities, 12 months or more (366) (2,885)
Total unrealized losses on available for sale securities (4,509) (3,570)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 769,692 371,400
Fair value of unrealized losses on available for sale securities, less than 12 months 692,103 192,720
Fair value of unrealized losses on available for sale securities, 12 months or more 77,589 178,681
Total fair value of unrealized losses on available for sale securities $ 769,692 $ 371,400
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 25 27
Available for sale, number of securities, 12 months or more | security 18 16
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (781) $ 0
Unrealized losses on held to maturity securities, 12 months or more 0 0
Total unrealized losses on held to maturity securities $ (781) $ 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 $ 61,422 $ 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 $ 61,422 $ 325
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 17 1
US Treasury Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (181)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (181)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 9,743  
Fair value of unrealized losses on available for sale securities, less than 12 months 9,743  
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 $ 9,743  
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  
Agency Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (9)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (9)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 14,991  
Fair value of unrealized losses on available for sale securities, less than 12 months 14,991  
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 $ 14,991  
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  
US States and Political Subdivisions Debt Securities [Member]    
Investment securities HTM    
Unrealized losses on held to maturity securities, less than 12 months $ (190)  
Unrealized losses on held to maturity securities, 12 months or more 0  
Total unrealized losses on held to maturity securities (190)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 18,891  
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 $ 18,891  
US States and Political Subdivisions Debt Securities [Member] | 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 11  
US States and Political Subdivisions Debt Securities [Member] | 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  
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (36) $ (129)
Unrealized losses on available for sale securities, 12 months or more (318) (2,885)
Total unrealized losses on available for sale securities (354) (3,013)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 96,782 187,948
Fair value of unrealized losses on available for sale securities, less than 12 months 23,835 9,267
Fair value of unrealized losses on available for sale securities, 12 months or more 72,947 178,681
Total fair value of unrealized losses on available for sale securities $ 96,782 $ 187,948
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 2 1
Available for sale, number of securities, 12 months or more | security 9 16
US Government-sponsored Enterprises Debt Securities [Member]    
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 (48) 0
Total unrealized losses on available for sale securities (48) (53)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,642 8,379
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 4,642 0
Total fair value of unrealized losses on available for sale securities $ 4,642 $ 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 9 0
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   2,000
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
FNMA/FHLMC | Residential Related Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months $ (3,285) $ (500)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (3,285) (500)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 604,030 163,002
Fair value of unrealized losses on available for sale securities, less than 12 months 604,030 163,002
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 $ 604,030 $ 163,002
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 17 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 $ (632)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (632)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 39,472  
Fair value of unrealized losses on available for sale securities, less than 12 months 39,472  
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 $ 39,472  
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 $ (591)  
Unrealized losses on held to maturity securities, 12 months or more 0  
Total unrealized losses on held to maturity securities (591)  
Fair value of unrealized losses on held to maturity securities, less than 12 months 42,530  
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 $ 42,530  
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  
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities    
Investment securities AFS    
Unrealized losses on available for sale securities, less than 12 months   $ (3)
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   9,784
Fair value of unrealized losses on available for sale securities, less than 12 months   9,784
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   $ 9,784
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   $ 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
Government National Mortgage Association (GNMA) [Member] | 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
Government National Mortgage Association (GNMA) [Member] | 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
Government National Mortgage Association (GNMA) [Member] | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 34 287
Fair value of unrealized losses on available for sale securities, less than 12 months 34 287
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 $ 34 $ 287
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 2 1
Available for sale, number of securities, 12 months or more | security 0 0