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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (12,089) $ (7,843)
Unrealized losses on available for sale securities, 12 months or more (11,206) (12,440)
Total unrealized losses on available for sale securities (23,295) (20,284)
Fair value of unrealized losses on available for sale securities, less than 12 months 489,740 834,616
Fair value of unrealized losses on available for sale securities, 12 months or more 257,838 748,487
Total fair value of unrealized losses on available for sale securities $ 747,578 $ 1,583,104
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 52 65
Available for sale, number of securities, 12 months or more | security 18 51
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (802) $ (2,199)
Unrealized losses on held to maturity securities, 12 months or more (1,612) (6,164)
Total unrealized losses on held to maturity securities $ (2,414) $ (8,363)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 10 36
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 154,950 $ 292,267
Fair value of unrealized losses on held to maturity securities, 12 months or more 127,166 367,532
Total fair value of unrealized losses on held to maturity securities $ 282,116 $ 659,799
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 31 67
U.S. government SBA agency securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (5)  
Unrealized losses on available for sale securities, 12 months or more 0  
Total unrealized losses on available for sale securities (5)  
Fair value of unrealized losses on available for sale securities, less than 12 months 4,958  
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 $ 4,958  
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 7  
Available for sale, number of securities, 12 months or more | security 0  
Obligations of state and political subdivisions (municipal securities)    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (1) $ (18)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (1) (18)
Fair value of unrealized losses on available for sale securities, less than 12 months 1,313 1,225
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 $ 1,313 $ 1,225
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 5 4
Available for sale, number of securities, 12 months or more | security 0 0
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (470) $ (1,105)
Unrealized losses on held to maturity securities, 12 months or more (5) (13)
Total unrealized losses on held to maturity securities (475) (1,118)
Fair value of unrealized losses on held to maturity securities, less than 12 months 28,779 77,562
Fair value of unrealized losses on held to maturity securities, 12 months or more 542 2,378
Total fair value of unrealized losses on held to maturity securities $ 29,321 $ 79,940
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 22 52
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 3 6
FFELP asset backed securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (10,971) $ (6,092)
Unrealized losses on available for sale securities, 12 months or more (8,262) (393)
Total unrealized losses on available for sale securities (19,234) (6,485)
Fair value of unrealized losses on available for sale securities, less than 12 months 222,197 250,780
Fair value of unrealized losses on available for sale securities, 12 months or more 119,228 12,913
Total fair value of unrealized losses on available for sale securities $ 341,424 $ 263,693
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 16 19
Available for sale, number of securities, 12 months or more | security 10 2
Other Debt securities    
Investment securities available for sale    
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 2,000 2,000
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 $ 2,000 $ 2,000
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 2 2
Available for sale, number of securities, 12 months or more | security 0 0
FNMA/FHLMC | Residential Related Securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months   $ 0
Unrealized losses on available for sale securities, 12 months or more   (59)
Total unrealized losses on available for sale securities   (59)
Fair value of unrealized losses on available for sale securities, less than 12 months   0
Fair value of unrealized losses on available for sale securities, 12 months or more   34,807
Total fair value of unrealized losses on available for sale securities   $ 34,807
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security   0
Available for sale, number of securities, 12 months or more | security   4
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ (6)
Unrealized losses on held to maturity securities, 12 months or more 0 (9)
Total unrealized losses on held to maturity securities 0 (15)
Fair value of unrealized losses on held to maturity securities, less than 12 months 0 1,242
Fair value of unrealized losses on held to maturity securities, 12 months or more 0 833
Total fair value of unrealized losses on held to maturity securities $ 0 $ 2,075
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 1 1
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 0 1
GNMA | Residential Related Securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months   $ (924)
Unrealized losses on available for sale securities, 12 months or more   (766)
Total unrealized losses on available for sale securities   (1,689)
Fair value of unrealized losses on available for sale securities, less than 12 months   322,394
Fair value of unrealized losses on available for sale securities, 12 months or more   79,461
Total fair value of unrealized losses on available for sale securities   $ 401,856
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security   18
Available for sale, number of securities, 12 months or more | security   3
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months   $ (1,059)
Unrealized losses on held to maturity securities, 12 months or more   (49)
Total unrealized losses on held to maturity securities   (1,108)
Fair value of unrealized losses on held to maturity securities, less than 12 months   187,261
Fair value of unrealized losses on held to maturity securities, 12 months or more   6,587
Total fair value of unrealized losses on held to maturity securities   $ 193,849
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security   12
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security   8
GNMA | Commercial mortgage-related securities    
Investment securities available for sale    
Unrealized losses on available for sale securities, less than 12 months $ (1,111) $ (810)
Unrealized losses on available for sale securities, 12 months or more (2,944) (11,222)
Total unrealized losses on available for sale securities (4,055) (12,032)
Fair value of unrealized losses on available for sale securities, less than 12 months 259,273 258,218
Fair value of unrealized losses on available for sale securities, 12 months or more 138,611 621,307
Total fair value of unrealized losses on available for sale securities $ 397,883 $ 879,524
Available-for-sale, Number of Securities    
Available for sale, number of securities, less than 12 months | security 22 22
Available for sale, number of securities, 12 months or more | security 8 42
Investment securities held to maturity    
Unrealized losses on held to maturity securities, less than 12 months $ (332) $ (29)
Unrealized losses on held to maturity securities, 12 months or more (1,607) (6,093)
Total unrealized losses on held to maturity securities (1,939) (6,122)
Fair value of unrealized losses on held to maturity securities, less than 12 months 126,170 26,202
Fair value of unrealized losses on held to maturity securities, 12 months or more 126,624 357,733
Total fair value of unrealized losses on held to maturity securities $ 252,794 $ 383,935
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 8 2
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more    
Investment securities held to maturity    
Number of held to maturity securities in a continuous unrealized loss position | security 7 21