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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investment securities AFS    
Amortized Cost $ 3,323,846 $ 3,028,399
Gross Unrealized Gains 42,885 60,612
Gross Unrealized (Losses) (9,782) (3,570)
Fair Value 3,356,949 3,085,441
Investment securities HTM    
Investment securities HTM, net 1,857,150 1,879,005
Held-to-maturity, Gross Unrealized Gains 118,544 149,938
Held-to-maturity, Gross Unrealized Loss (3,154) 0
Held-to-maturity, Fair Value 1,972,541 2,028,943
Fair Value, Inputs, Level 2    
Investment securities AFS    
Fair Value 3,303,257 3,058,910
Investment securities HTM    
Investment securities HTM, net 1,856,088 1,877,939
Held-to-maturity, Fair Value 1,971,459 2,027,852
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | FFELP    
Investment securities AFS    
Fair Value 325,933 327,189
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other Debt And Other Equity Securities    
Investment securities AFS    
Fair Value 3,000 3,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | SBA    
Investment securities AFS    
Fair Value   8,584
Fair Value, Inputs, Level 1    
Investment securities AFS    
Fair Value 53,693 26,531
Investment securities HTM    
Investment securities HTM, net 1,000 999
Held-to-maturity, Fair Value 1,019 1,024
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other Debt And Other Equity Securities    
Investment securities AFS    
Fair Value 1,684 1,661
U. S. Treasury securities    
Investment securities AFS    
Amortized Cost 54,237 26,436
Gross Unrealized Gains 0 95
Gross Unrealized (Losses) (544) 0
Fair Value   26,531
Investment securities HTM    
Investment securities HTM, net 1,000 999
Held-to-maturity, Gross Unrealized Gains 20 25
Held-to-maturity, Gross Unrealized Loss 0 0
U. S. Treasury securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Investment securities AFS    
Fair Value 53,693 26,531
Agency Securities    
Investment securities AFS    
Amortized Cost 15,000 24,985
Gross Unrealized Gains 0 53
Gross Unrealized (Losses) (96) 0
Agency Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Investment securities AFS    
Fair Value 14,904 25,038
Obligations of state and political subdivisions (municipal securities)    
Investment securities AFS    
Amortized Cost 411,964 425,057
Gross Unrealized Gains 21,218 25,605
Gross Unrealized (Losses) 0 0
Fair Value 433,182 450,662
Investment securities HTM    
Investment securities HTM, net 1,455,462 1,441,900
Held-to-maturity, Gross Unrealized Gains 106,933 133,544
Held-to-maturity, Gross Unrealized Loss (994) 0
Held-to-maturity, Fair Value 1,561,401 1,575,445
Obligations of state and political subdivisions (municipal securities) | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Investment securities AFS    
Fair Value 433,182 450,662
FFELP    
Investment securities AFS    
Amortized Cost 325,812 329,030
Gross Unrealized Gains 1,675 1,172
Gross Unrealized (Losses) (1,554) (3,013)
Fair Value 325,933  
Investment securities HTM    
Investment securities HTM, net 0  
Held-to-maturity, Fair Value 0  
SBA    
Investment securities AFS    
Amortized Cost 8,216 8,637
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (57) (53)
Fair Value 8,160  
Investment securities HTM    
Investment securities HTM, net 0  
Held-to-maturity, Fair Value 0  
SBA | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Investment securities AFS    
Fair Value 8,160 8,584
Other debt securities    
Investment securities AFS    
Amortized Cost 3,000 3,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
FNMA / FHLMC | Residential Related Securities    
Investment securities AFS    
Amortized Cost 1,910,644 1,448,806
Gross Unrealized Gains 5,956 12,935
Gross Unrealized (Losses) (5,647) (500)
Fair Value 1,910,954  
Investment securities HTM    
Investment securities HTM, net 47,480 54,599
Held-to-maturity, Gross Unrealized Gains 2,471 2,891
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 49,951 57,490
FNMA / FHLMC | Commercial mortgage-related securities    
Investment securities AFS    
Amortized Cost 93,902 19,654
Gross Unrealized Gains 2,330 3,250
Gross Unrealized (Losses) (1,883) 0
Fair Value 94,349  
Investment securities HTM    
Investment securities HTM, net 63,844 11,211
Held-to-maturity, Gross Unrealized Gains 157 0
Held-to-maturity, Gross Unrealized Loss (2,138) 0
Held-to-maturity, Fair Value 61,863 11,211
GNMA [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities    
Investment securities AFS    
Fair Value 389,411 524,756
GNMA [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities    
Investment securities AFS    
Fair Value 123,365 235,537
GNMA [Member] | Residential Related Securities    
Investment securities AFS    
Amortized Cost 119,913 231,364
Gross Unrealized Gains 3,451 4,176
Gross Unrealized (Losses) 0 (3)
Fair Value 123,365  
Investment securities HTM    
Investment securities HTM, net 87,717 114,553
Held-to-maturity, Gross Unrealized Gains 3,353 4,260
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 91,070 118,813
GNMA [Member] | Commercial mortgage-related securities    
Investment securities AFS    
Amortized Cost 381,158 511,429
Gross Unrealized Gains 8,254 13,327
Gross Unrealized (Losses) 0 0
Fair Value 389,411  
Investment securities HTM    
Investment securities HTM, net 201,648 255,742
Held-to-maturity, Gross Unrealized Gains 5,611 9,218
Held-to-maturity, Gross Unrealized Loss (21) 0
Held-to-maturity, Fair Value 207,238 264,960
FNMA / FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities    
Investment securities AFS    
Fair Value 94,349 22,904
FNMA / FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities    
Investment securities AFS    
Fair Value $ 1,910,954 $ 1,461,241