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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)