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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale: |  |
Amortized Cost | $ 4,377,443 | $ 4,100,417
Gross Unrealized Gains | 7,275 | 10,996
Gross Unrealized Losses | (123,068) | (67,967)
Fair Value | 4,261,651 | 4,043,446
Held to Maturity Amortized Cost | 2,602,247 | 2,282,853
Held-to-maturity, Gross Unrealized Gains | 15,553 | 26,543
Held-to-maturity, Gross Unrealized Loss | (56,856) | (25,822)
Held-to-maturity, Fair Value | 2,560,943 | 2,283,574
US Treasury Securities |  |
Investment securities available for sale: |  |
Amortized Cost | 1,001 | 1,003
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (7)
Fair Value | 996 | 996
Obligations of state and political subdivisions (municipal securities) |  |
Investment securities available for sale: |  |
Held to Maturity Amortized Cost | 1,593,147 | 1,281,320
Held-to-maturity, Gross Unrealized Gains | 4,851 | 13,899
Held-to-maturity, Gross Unrealized Loss | (17,698) | (3,177)
Held-to-maturity, Fair Value | 1,580,300 | 1,292,042
Residential Related Securities | FNMA and FHLMC |  |
Investment securities available for sale: |  |
Amortized Cost | 396,368 | 457,680
Gross Unrealized Gains | 5,573 | 9,722
Gross Unrealized Losses | (5,232) | (2,634)
Fair Value | 396,709 | 464,768
Held to Maturity Amortized Cost | 97,822 | 40,995
Held-to-maturity, Gross Unrealized Gains | 191 | 398
Held-to-maturity, Gross Unrealized Loss | (2,306) | (489)
Held-to-maturity, Fair Value | 95,707 | 40,904
Residential Related Securities | GNMA |  |
Investment securities available for sale: |  |
Amortized Cost | 2,275,481 | 1,944,453
Gross Unrealized Gains | 23 | 275
Gross Unrealized Losses | (65,315) | (31,378)
Fair Value | 2,210,189 | 1,913,350
Held to Maturity Amortized Cost | 388,174 | 414,440
Held-to-maturity, Gross Unrealized Gains | 1,969 | 2,700
Held-to-maturity, Gross Unrealized Loss | (13,020) | (6,400)
Held-to-maturity, Fair Value | 377,123 | 410,740
Private Label |  |
Investment securities available for sale: |  |
Amortized Cost | 1,037 | 1,067
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (8)
Fair Value | 1,031 | 1,059
Held to Maturity Amortized Cost | 0 |
Held-to-maturity, Fair Value | 0 |
GNMA Commercial Mortgage-Related Securities |  |
Investment securities available for sale: |  |
Amortized Cost | 1,400,680 | 1,547,173
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (52,399) | (33,901)
Fair Value | 1,348,282 | 1,513,277
Held to Maturity Amortized Cost | 523,103 |
Held-to-maturity, Gross Unrealized Gains | 8,542 |
Held-to-maturity, Gross Unrealized Loss | (23,832) |
Held-to-maturity, Fair Value | 507,813 |
GNMA Commercial Mortgage-Related Securities | GNMA |  |
Investment securities available for sale: |  |
Held to Maturity Amortized Cost |  | 546,098
Held-to-maturity, Gross Unrealized Gains |  | 9,546
Held-to-maturity, Gross Unrealized Loss |  | (15,756)
Held-to-maturity, Fair Value |  | 539,888
Asset backed Securities |  |
Investment securities available for sale: |  |
Amortized Cost | 298,263 |
Gross Unrealized Gains | 1,679 |
Gross Unrealized Losses | (111) |
Fair Value | 299,831 |
Held to Maturity Amortized Cost | 0 |
Held-to-maturity, Fair Value | 0 |
Other Debt And Other Equity 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 [Member] |  |
Investment securities available for sale: |  |
Amortized Cost | 1,613 | 1,519
Gross Unrealized Gains | 0 | 127
Gross Unrealized Losses | 0 | (14)
Fair Value | 1,613 | 1,632
Held to Maturity Amortized Cost | 0 |
Held-to-maturity, Fair Value | 0 |
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Investment securities available for sale: |  |
Amortized Cost |  | 144,322
Gross Unrealized Gains |  | 867
Gross Unrealized Losses |  | (13)
Fair Value |  | $ 145,176
Investment Securities Class [Domain] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Securities Received as Collateral | $ 3,100,000 |

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