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Securities (Securities in a Continuous Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in a continuous unrealized loss position for less than 12 months | security 31 47
Fair value of securities in a continuous unrealized loss position for less than 12 months $ 233,468 $ 505,906
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months $ (3,712) $ (12,726)
Number of securities in a continuous unrealized loss position for 12 months or longer | security 26 10
Fair value of securities in a continuous unrealized loss position for 12 months or longer $ 236,536 $ 26,736
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer $ (6,793) $ (3,115)
Number of securities in a continuous unrealized loss position total | security 57 57
Fair value of securities in a continuous unrealized loss position total $ 470,004 $ 532,642
Unrealized losses of securities in a continuous unrealized loss position total $ (10,505) $ (15,841)
Obligations of U.S. government agencies and U.S. government-sponsored enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in a continuous unrealized loss position for less than 12 months | security 9 10
Fair value of securities in a continuous unrealized loss position for less than 12 months $ 79,988 $ 98,433
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months $ (1,511) $ (3,050)
Number of securities in a continuous unrealized loss position for 12 months or longer | security 2 0
Fair value of securities in a continuous unrealized loss position for 12 months or longer $ 29,137 $ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer $ (863) $ 0
Number of securities in a continuous unrealized loss position total | security 11 10
Fair value of securities in a continuous unrealized loss position total $ 109,125 $ 98,433
Unrealized losses of securities in a continuous unrealized loss position total $ (2,374) $ (3,050)
Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in a continuous unrealized loss position for less than 12 months | security 20 35
Fair value of securities in a continuous unrealized loss position for less than 12 months $ 153,078 $ 407,073
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months $ (2,200) $ (9,671)
Number of securities in a continuous unrealized loss position for 12 months or longer | security 14 0
Fair value of securities in a continuous unrealized loss position for 12 months or longer $ 179,166 $ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer $ (4,285) $ 0
Number of securities in a continuous unrealized loss position total | security 34 35
Fair value of securities in a continuous unrealized loss position total $ 332,244 $ 407,073
Unrealized losses of securities in a continuous unrealized loss position total $ (6,485) $ (9,671)
Individual name issuer trust preferred debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in a continuous unrealized loss position for less than 12 months | security 0 0
Fair value of securities in a continuous unrealized loss position for less than 12 months $ 0 $ 0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months $ 0 $ 0
Number of securities in a continuous unrealized loss position for 12 months or longer | security 9 10
Fair value of securities in a continuous unrealized loss position for 12 months or longer $ 26,388 $ 26,736
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer $ (1,509) $ (3,115)
Number of securities in a continuous unrealized loss position total | security 9 10
Fair value of securities in a continuous unrealized loss position total $ 26,388 $ 26,736
Unrealized losses of securities in a continuous unrealized loss position total $ (1,509) $ (3,115)
Corporate bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in a continuous unrealized loss position for less than 12 months | security 2 2
Fair value of securities in a continuous unrealized loss position for less than 12 months $ 402 $ 400
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months $ (1) $ (5)
Number of securities in a continuous unrealized loss position for 12 months or longer | security 1 0
Fair value of securities in a continuous unrealized loss position for 12 months or longer $ 1,845 $ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer $ (136) $ 0
Number of securities in a continuous unrealized loss position total | security 3 2
Fair value of securities in a continuous unrealized loss position total $ 2,247 $ 400
Unrealized losses of securities in a continuous unrealized loss position total $ (137) $ (5)