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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investment securities available for sale    
Amortized Cost $ 3,203,046 $ 3,251,950
Gross Unrealized Gains 62,015 30,920
Gross Unrealized (Losses) (6,701) (20,284)
Fair Value 3,258,360 3,262,586
Investment securities held to maturity    
Investment securities held to maturity, net 1,990,940 2,205,083
Held-to-maturity, Gross Unrealized Gains 133,880 79,744
Held-to-maturity, Gross Unrealized Loss (368) (8,363)
Held-to-maturity, Fair Value 2,124,452 2,276,465
U. S. Treasury securities    
Investment securities available for sale    
Amortized Cost 26,541  
Gross Unrealized Gains 108  
Gross Unrealized (Losses) 0  
Fair Value 26,650  
Investment securities held to maturity    
Investment securities held to maturity, net 999 999
Held-to-maturity, Gross Unrealized Gains 31 19
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 1,030 1,018
Agency Securities    
Investment securities available for sale    
Amortized Cost 24,983  
Gross Unrealized Gains 50  
Gross Unrealized (Losses) 0  
Fair Value 25,033  
Obligations of state and political subdivisions (municipal securities)    
Investment securities available for sale    
Amortized Cost 450,174 529,908
Gross Unrealized Gains 24,521 16,269
Gross Unrealized (Losses) 0 (18)
Fair Value 474,695 546,160
Investment securities held to maturity    
Investment securities held to maturity, net 1,444,325 1,418,569
Held-to-maturity, Gross Unrealized Gains 115,343 69,775
Held-to-maturity, Gross Unrealized Loss (368) (1,118)
Held-to-maturity, Fair Value 1,559,300 1,487,227
FFELP    
Investment securities available for sale    
Amortized Cost 332,398 270,178
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,556) (6,485)
Fair Value 325,843 263,693
Investment securities held to maturity    
Investment securities held to maturity, net 0  
Held-to-maturity, Fair Value 0  
SBA    
Investment securities available for sale    
Amortized Cost 9,159  
Gross Unrealized Gains 0  
Gross Unrealized (Losses) (48)  
Fair Value 9,111  
Investment securities held to maturity    
Investment securities held to maturity, net 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) (3) 0
Fair Value 2,997 3,000
FNMA / FHLMC | Residential mortgage-related securities    
Investment securities available for sale    
Amortized Cost 1,267,003 131,158
Gross Unrealized Gains 9,554 1,562
Gross Unrealized (Losses) (94) (59)
Fair Value 1,276,463 132,660
Investment securities held to maturity    
Investment securities held to maturity, net 63,142 81,676
Held-to-maturity, Gross Unrealized Gains 3,147 1,759
Held-to-maturity, Gross Unrealized Loss 0 (15)
Held-to-maturity, Fair Value 66,289 83,420
FNMA / FHLMC | Commercial mortgage-related securities    
Investment securities available for sale    
Amortized Cost 19,724 19,929
Gross Unrealized Gains 2,153 1,799
Gross Unrealized (Losses) 0 0
Fair Value 21,877 21,728
Investment securities held to maturity    
Investment securities held to maturity, net 11,220  
Held-to-maturity, Gross Unrealized Gains 0  
Held-to-maturity, Gross Unrealized Loss 0  
Held-to-maturity, Fair Value 11,220  
GNMA | Residential mortgage-related securities    
Investment securities available for sale    
Amortized Cost 399,490 982,941
Gross Unrealized Gains 7,823 3,887
Gross Unrealized (Losses) 0 (1,689)
Fair Value 407,313 985,139
Investment securities held to maturity    
Investment securities held to maturity, net 159,455 269,523
Held-to-maturity, Gross Unrealized Gains 5,217 1,882
Held-to-maturity, Gross Unrealized Loss 0 (1,108)
Held-to-maturity, Fair Value 164,672 270,296
GNMA | Commercial mortgage-related securities    
Investment securities available for sale    
Amortized Cost 670,573 1,314,836
Gross Unrealized Gains 17,805 7,403
Gross Unrealized (Losses) 0 (12,032)
Fair Value 688,378 1,310,207
Investment securities held to maturity    
Investment securities held to maturity, net 311,798 434,317
Held-to-maturity, Gross Unrealized Gains 10,142 6,308
Held-to-maturity, Gross Unrealized Loss 0 (6,122)
Held-to-maturity, Fair Value $ 321,941 $ 434,503