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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investment securities available for sale    
Amortized Cost $ 4,043,470 $ 4,100,417
Gross Unrealized Gains 3,649 10,996
Gross Unrealized Losses (98,610) (67,967)
Fair Value 3,948,510 4,043,446
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 2,740,511 2,282,853
Gross Unrealized Gains 17,593 26,543
Held-to-maturity, Gross Unrealized Loss (47,835) (25,822)
Fair Value 2,710,271 2,283,574
U.S. Treasury securities    
Investment securities available for sale    
Amortized Cost 1,000 1,003
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (7)
Fair Value 999 996
Obligations of state and political subdivisions (municipal securities)    
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 1,790,683 1,281,320
Gross Unrealized Gains 8,255 13,899
Held-to-maturity, Gross Unrealized Loss (15,279) (3,177)
Fair Value 1,783,659 1,292,042
Residential Related Securities | FNMA / FHLMC    
Investment securities available for sale    
Amortized Cost 296,296 457,680
Gross Unrealized Gains 2,466 9,722
Gross Unrealized Losses (3,510) (2,634)
Fair Value 295,252 464,768
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 92,788 40,995
Gross Unrealized Gains 169 398
Held-to-maturity, Gross Unrealized Loss (1,795) (489)
Fair Value 91,162 40,904
Residential Related Securities | GNMA    
Investment securities available for sale    
Amortized Cost 2,169,943 1,944,453
Gross Unrealized Gains 473 275
Gross Unrealized Losses (41,885) (31,378)
Fair Value 2,128,531 1,913,350
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 351,606 414,440
Gross Unrealized Gains 1,611 2,700
Held-to-maturity, Gross Unrealized Loss (8,181) (6,400)
Fair Value 345,035 410,740
Private-label    
Investment securities available for sale    
Amortized Cost 1,007 1,067
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4) (8)
Fair Value 1,003 1,059
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 0  
Fair Value 0  
GNMA commercial mortgage-related securities    
Investment securities available for sale    
Amortized Cost 1,273,309 1,547,173
Gross Unrealized Gains 0 5
Gross Unrealized Losses (52,512) (33,901)
Fair Value 1,220,797 1,513,277
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 505,434 546,098
Gross Unrealized Gains 7,559 9,546
Held-to-maturity, Gross Unrealized Loss (22,579) (15,756)
Fair Value 490,414 539,888
FFELP asset backed securities    
Investment securities available for sale    
Amortized Cost 297,347 144,322
Gross Unrealized Gains 711 867
Gross Unrealized Losses (698) (13)
Fair Value 297,360 145,176
Fixed income securities    
Investment securities available for sale    
Amortized Cost 3,000 3,200
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 (12)
Fair Value 3,000 3,188
Equity securities    
Investment securities available for sale    
Amortized Cost 1,568 1,519
Gross Unrealized Gains 0 127
Gross Unrealized Losses 0 (14)
Fair Value 1,568 $ 1,632
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 0  
Fair Value $ 0