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Securities (Available for sale securities losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 months $ 1,111,078 $ 948,929
12 months or longer 511,246 559,158
Total 1,622,324 1,508,087
Unrealized Losses    
Less than 12 months (21,984) (12,238)
12 months or longer (35,968) (30,101)
Total (57,952) (42,339)
Total debt securities    
Fair Value    
Less than 12 months 1,111,078 948,929
12 months or longer 511,246 559,158
Total 1,622,324 1,508,087
Unrealized Losses    
Less than 12 months (21,984) (12,238)
12 months or longer (35,968) (30,101)
Total (57,952) (42,339)
U.S. government corporations and agencies    
Fair Value    
Less than 12 months 10,685 4,819
12 months or longer 0 0
Total 10,685 4,819
Unrealized Losses    
Less than 12 months (69) (38)
12 months or longer 0 0
Total (69) (38)
Mortgage and asset-backed securities    
Fair Value    
Less than 12 months 923,293 851,070
12 months or longer 379,672 399,978
Total 1,302,965 1,251,048
Unrealized Losses    
Less than 12 months (18,459) (11,533)
12 months or longer (28,997) (26,054)
Total (47,456) (37,587)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 177,100 93,040
12 months or longer 131,574 159,180
Total 308,674 252,220
Unrealized Losses    
Less than 12 months (3,456) (667)
12 months or longer (6,971) (4,047)
Total $ (10,427) $ (4,714)