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Investments (Unrealized Losses) (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations $ 0
Investment securities available for sale:    
Fair Value, Less than 12 months 180,067,000 705,526,000
Unrealized Losses, Less than 12 months 535,000 3,943,000
Fair Value, 12 months or more 1,665,581,000 2,796,627,000
Unrealized Losses, Greater than 12 months 8,509,000 52,489,000
Fair Value, Total 1,845,648,000 3,502,153,000
Unrealized Losses, Total 9,044,000 56,432,000
Investment securities held to maturity    
Unrealized Losses, Total 0  
U. S. Treasury    
Investment securities available for sale:    
Fair Value, Less than 12 months 0 248,983,000
Unrealized Losses, Less than 12 months 0 113,000
Fair Value, 12 months or more 150,248,000 848,622,000
Unrealized Losses, Greater than 12 months 82,000 2,053,000
Fair Value, Total 150,248,000 1,097,605,000
Unrealized Losses, Total 82,000 2,166,000
Agency Securities    
Investment securities available for sale:    
Fair Value, Less than 12 months 39,456,000 115,273,000
Unrealized Losses, Less than 12 months 25,000 601,000
Fair Value, 12 months or more 58,879,000 2,310,000
Unrealized Losses, Greater than 12 months 164,000 38,000
Fair Value, Total 98,335,000 117,583,000
Unrealized Losses, Total 189,000 639,000
Mortgage Backed Securities    
Investment securities available for sale:    
Fair Value, Less than 12 months 109,521,000 262,204,000
Unrealized Losses, Less than 12 months 288,000 2,387,000
Fair Value, 12 months or more 1,448,894,000 1,940,695,000
Unrealized Losses, Greater than 12 months 8,130,000 50,376,000
Fair Value, Total 1,558,415,000 2,202,899,000
Unrealized Losses, Total 8,418,000 52,763,000
Investment securities held to maturity    
Fair Value, Less than 12 months   5,111,000
Unrealized Losses, Less than 12 months   181,000
Fair Value, 12 months or more   10,131,000
Unrealized Losses, 12 months or more   309,000
Fair Value, Total   15,242,000
Unrealized Losses, Total 0 490,000
Corporate bonds    
Investment securities available for sale:    
Fair Value, Less than 12 months   79,066,000
Unrealized Losses, Less than 12 months   842,000
Fair Value, 12 months or more   5,000,000
Unrealized Losses, Greater than 12 months   22,000
Fair Value, Total   84,066,000
Unrealized Losses, Total   864,000
Corporate Bonds    
Investment securities available for sale:    
Fair Value, Less than 12 months 31,090,000  
Unrealized Losses, Less than 12 months 222,000  
Fair Value, 12 months or more 7,560,000  
Unrealized Losses, Greater than 12 months 133,000  
Fair Value, Total 38,650,000  
Unrealized Losses, Total 355,000 $ 864,000
Other    
Investment securities held to maturity    
Unrealized Losses, Total $ 0