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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investment securities available for sale    
Amortized Cost $ 3,100,291 $ 3,251,950
Gross Unrealized Gains 65,584 30,920
Gross Unrealized (Losses) (16,102) (20,284)
Fair Value 3,149,773 3,262,586
Investment securities held to maturity    
Held to Maturity, Amortized Cost 2,077,287 2,205,083
Held-to-maturity, Gross Unrealized Gains 132,271 79,744
Held-to-maturity, Gross Unrealized Loss (53) (8,363)
Held-to-maturity, Fair Value 2,209,505 2,276,465
U. S. Treasury securities    
Investment securities available for sale    
Amortized Cost 26,646  
Gross Unrealized Gains 88  
Gross Unrealized (Losses) 0  
Fair Value 26,735  
Investment securities held to maturity    
Held to Maturity, Amortized Cost 999 999
Held-to-maturity, Gross Unrealized Gains 36 19
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 1,036 1,018
Agency Securities    
Investment securities available for sale    
Amortized Cost 24,982  
Gross Unrealized Gains 25  
Gross Unrealized (Losses) 0  
Fair Value 25,007  
Obligations of state and political subdivisions (municipal securities)    
Investment securities available for sale    
Amortized Cost 471,346 529,908
Gross Unrealized Gains 24,542 16,269
Gross Unrealized (Losses) 0 (18)
Fair Value 495,888 546,160
Investment securities held to maturity    
Held to Maturity, Amortized Cost 1,435,938 1,418,569
Held-to-maturity, Gross Unrealized Gains 110,132 69,775
Held-to-maturity, Gross Unrealized Loss (53) (1,118)
Held-to-maturity, Fair Value 1,546,018 1,487,227
FFELP    
Investment securities available for sale    
Amortized Cost 356,532 270,178
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (16,058) (6,485)
Fair Value 340,474 263,693
Investment securities held to maturity    
Held to Maturity, Amortized Cost 0  
Held-to-maturity, Fair Value 0  
SBA    
Investment securities available for sale    
Amortized Cost 9,619  
Gross Unrealized Gains 0  
Gross Unrealized (Losses) (44)  
Fair Value 9,575  
Investment securities held to maturity    
Held to Maturity, Amortized Cost 0  
Held-to-maturity, Fair Value 0  
Other debt securities    
Investment securities available for sale    
Amortized Cost 3,000 3,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value 3,000 3,000
FNMA / FHLMC | Residential mortgage-related securities    
Investment securities available for sale    
Amortized Cost 813,458 131,158
Gross Unrealized Gains 4,652 1,562
Gross Unrealized (Losses) 0 (59)
Fair Value 818,110 132,660
Investment securities held to maturity    
Held to Maturity, Amortized Cost 71,872 81,676
Held-to-maturity, Gross Unrealized Gains 3,400 1,759
Held-to-maturity, Gross Unrealized Loss 0 (15)
Held-to-maturity, Fair Value 75,271 83,420
FNMA / FHLMC | Commercial mortgage-related securities    
Investment securities available for sale    
Amortized Cost 19,793 19,929
Gross Unrealized Gains 2,269 1,799
Gross Unrealized (Losses) 0 0
Fair Value 22,061 21,728
Investment securities held to maturity    
Held to Maturity, Amortized Cost 0  
Held-to-maturity, Fair Value 0  
GNMA | Residential mortgage-related securities    
Investment securities available for sale    
Amortized Cost 592,338 982,941
Gross Unrealized Gains 13,222 3,887
Gross Unrealized (Losses) 0 (1,689)
Fair Value 605,561 985,139
Investment securities held to maturity    
Held to Maturity, Amortized Cost 207,908 269,523
Held-to-maturity, Gross Unrealized Gains 7,012 1,882
Held-to-maturity, Gross Unrealized Loss 0 (1,108)
Held-to-maturity, Fair Value 214,920 270,296
GNMA | Commercial mortgage-related securities    
Investment securities available for sale    
Amortized Cost 782,577 1,314,836
Gross Unrealized Gains 20,786 7,403
Gross Unrealized (Losses) 0 (12,032)
Fair Value 803,362 1,310,207
Investment securities held to maturity    
Held to Maturity, Amortized Cost 360,570 434,317
Held-to-maturity, Gross Unrealized Gains 11,691 6,308
Held-to-maturity, Gross Unrealized Loss 0 (6,122)
Held-to-maturity, Fair Value $ 372,261 $ 434,503