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Securities (Available for sale securities losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 months $ 918,067 $ 1,162,538
12 months or longer 584,737 272,700
Total 1,502,804 1,435,238
Unrealized Losses    
Less than 12 months (13,412) (42,868)
12 months or longer (26,755) (14,762)
Total (40,167) (57,630)
Total debt securities    
Fair Value    
Less than 12 months 918,067 1,162,538
12 months or longer 584,737 272,700
Total 1,502,804 1,435,238
Unrealized Losses    
Less than 12 months (13,412) (42,868)
12 months or longer (26,755) (14,762)
Total (40,167) (57,630)
U.S. government corporations and agencies    
Fair Value    
Less than 12 months 6,901 4,185
12 months or longer 0 0
Total 6,901 4,185
Unrealized Losses    
Less than 12 months (34) (32)
12 months or longer 0 0
Total (34) (32)
Mortgage-backed securities    
Fair Value    
Less than 12 months 761,235 744,202
12 months or longer 431,669 272,449
Total 1,192,904 1,016,651
Unrealized Losses    
Less than 12 months (11,558) (23,527)
12 months or longer (21,375) (14,759)
Total (32,933) (38,286)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 149,931 414,151
12 months or longer 153,068 251
Total 302,999 414,402
Unrealized Losses    
Less than 12 months (1,820) (19,309)
12 months or longer (5,380) (3)
Total (7,200) (19,312)
Equity securities    
Fair Value    
Less than 12 months 0 0
12 months or longer 0 0
Total 0 0
Unrealized Losses    
Less than 12 months 0 0
12 months or longer 0 0
Total $ 0 $ 0