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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investment securities available for sale    
Cost $ 4,858,178 $ 7,229,014
Gross Unrealized Gains 2,267 32,094
Gross Unrealized Losses 76,938 80,928
Fair Value 4,783,507 7,180,180
Investment securities held to maturity    
Cost 2,299,774 76
U. S. Treasury    
Investment securities available for sale    
Cost 1,508,435 1,658,410
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4,461 546
Fair Value 1,503,974 1,657,864
Government Agency    
Investment securities available for sale    
Cost 131,233 8,695
Gross Unrealized Gains 157 15
Gross Unrealized Losses 355 40
Fair Value 131,035 8,670
Mortgage Backed Securities    
Investment securities available for sale    
Cost 3,104,316 5,419,379
Gross Unrealized Gains 1,621 1,529
Gross Unrealized Losses 71,872 80,152
Fair Value 3,034,065 5,340,756
Investment securities held to maturity    
Cost 2,299,774 76
Held To Maturity Securities Accumulated Unrecognized Holding Gain 3,778 5
Held To Maturity Securities Accumulated Unrecognized Holding Loss 1,459 0
Fair Value 2,302,093 81
Equity Securities    
Investment securities available for sale    
Cost 0 75,471
Gross Unrealized Gains   29,737
Gross Unrealized Losses   0
Fair Value 0 105,208
Corporate Bonds    
Investment securities available for sale    
Cost 108,649 59,414
Gross Unrealized Gains 391 557
Gross Unrealized Losses 250 8
Fair Value 108,790 59,963
Other    
Investment securities available for sale    
Cost 5,545 7,645
Gross Unrealized Gains 98 256
Gross Unrealized Losses 0 182
Fair Value $ 5,643 $ 7,719