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Bank segment - Components of investment securities (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
issue
Dec. 31, 2015
USD ($)
issue
Available-for-sale securities    
Total available-for-sale securities, Amortized cost $ 987,081 $ 823,756
Gross unrealized gains 10,907 4,589
Gross unrealized losses (1,004) (7,697)
Available-for-sale investment securities $ 996,984 $ 820,648
Available-for-sale, securities, less than 12 months, number of issues | issue 19 51
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months $ 144,675 $ 388,838
Gross unrealized losses, less than 12 months $ (335) $ (3,732)
Available-for-sale, securities, greater than 12 months, number of issues | issue 14 28
Fair value, 12 months or longer $ 55,292 $ 143,195
Gross unrealized losses, 12 months or longer (669) (3,965)
U.S. Treasury and federal agency obligations    
Available-for-sale securities    
Total available-for-sale securities, Amortized cost 186,287 213,234
Gross unrealized gains 3,125 1,025
Gross unrealized losses (40) (1,300)
Available-for-sale investment securities $ 189,372 $ 212,959
Available-for-sale, securities, less than 12 months, number of issues | issue 1 13
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months $ 9,988 $ 83,053
Gross unrealized losses, less than 12 months $ (12) $ (866)
Available-for-sale, securities, greater than 12 months, number of issues | issue 1 3
Fair value, 12 months or longer $ 3,834 $ 17,378
Gross unrealized losses, 12 months or longer (28) (434)
Mortgage-related securities- FNMA, FHLMC and GNMA    
Available-for-sale securities    
Total available-for-sale securities, Amortized cost 800,794 610,522
Gross unrealized gains 7,782 3,564
Gross unrealized losses (964) (6,397)
Available-for-sale investment securities $ 807,612 $ 607,689
Available-for-sale, securities, less than 12 months, number of issues | issue 18 38
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months $ 134,687 $ 305,785
Gross unrealized losses, less than 12 months $ (323) $ (2,866)
Available-for-sale, securities, greater than 12 months, number of issues | issue 13 25
Fair value, 12 months or longer $ 51,458 $ 125,817
Gross unrealized losses, 12 months or longer $ (641) $ (3,531)