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Bank segment - Components of investment securities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 USD ($) issue | Dec. 31, 2014 USD ($) issue
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | $ 584,152 | $ 549,627
Gross unrealized gains | 9,178 | 6,745
Gross unrealized losses | (2,682) | (5,978)
Available-for-sale securities | $ 590,648 | $ 550,394
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 7 | 12
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 50,862 | $ 88,999
Gross unrealized losses, less than 12 months | $ (91) | $ (525)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 29 | 34
Fair value, 12 months or longer | $ 166,920 | $ 201,791
Gross unrealized losses, 12 months or longer | (2,591) | (5,453)
U.S. Treasury and federal agency obligations |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 138,593 | 119,507
Gross unrealized gains | 2,029 | 1,092
Gross unrealized losses | (395) | (1,039)
Available-for-sale securities | $ 140,227 | $ 119,560
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 1 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 9,973 | $ 41,970
Gross unrealized losses, less than 12 months | $ (2) | $ (361)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 3 | 5
Fair value, 12 months or longer | $ 19,198 | $ 29,168
Gross unrealized losses, 12 months or longer | (393) | (678)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Total available-for-sale securities, Amortized cost | 445,559 | 430,120
Gross unrealized gains | 7,149 | 5,653
Gross unrealized losses | (2,287) | (4,939)
Available-for-sale securities | $ 450,421 | $ 430,834
Available-for-Sale, Securities, Less Than 12 Months, Number of Issues | issue | 6 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | $ 40,889 | $ 47,029
Gross unrealized losses, less than 12 months | $ (89) | $ (164)
Available for Sale, Securities, More Than 12 Months, Number of Issues | issue | 26 | 29
Fair value, 12 months or longer | $ 147,722 | $ 172,623
Gross unrealized losses, 12 months or longer | $ (2,198) | $ (4,775)

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