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Bank segment - Principal balance of impaired loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Recorded investment:      
With no related allowance recorded $ 15,008   $ 18,811
With an allowance recorded 24,757   32,948
Recorded investment 39,765   51,759
Unpaid principal balance:      
With no related allowance recorded 19,828   23,200
With an allowance recorded 24,976   33,205
Unpaid principal balance 44,804   56,405
Related Allowance 3,700   4,083
Average recorded investment:      
With no related allowance recorded 17,643 $ 19,003  
With an allowance recorded 25,284 36,177  
Average recorded investment 42,927 55,180  
Interest income recognized:      
With no related allowance recorded 130 73  
With an allowance recorded 620 246  
Interest income recognized 750 319  
Residential 1-4 family      
Recorded investment:      
With no related allowance recorded 9,145   9,571
With an allowance recorded 10,195   10,283
Recorded investment 19,340   19,854
Unpaid principal balance:      
With no related allowance recorded 9,980   10,400
With an allowance recorded 10,398   10,486
Unpaid principal balance 20,378   20,886
Related Allowance 1,386   1,352
Average recorded investment:      
With no related allowance recorded 9,555 10,392  
With an allowance recorded 10,048 12,018  
Average recorded investment 19,603 22,410  
Interest income recognized:      
With no related allowance recorded 84 51  
With an allowance recorded 119 122  
Interest income recognized 203 173  
Commercial real estate      
Recorded investment:      
With no related allowance recorded 218   223
With an allowance recorded 1,297   1,346
Recorded investment 1,515   1,569
Unpaid principal balance:      
With no related allowance recorded 227   228
With an allowance recorded 1,297   1,346
Unpaid principal balance 1,524   1,574
Related Allowance 74   80
Average recorded investment:      
With no related allowance recorded 220 1,173  
With an allowance recorded 1,300 854  
Average recorded investment 1,520 2,027  
Interest income recognized:      
With no related allowance recorded 0 0  
With an allowance recorded 14 0  
Interest income recognized 14 0  
Home equity line of credit      
Recorded investment:      
With no related allowance recorded 2,376   1,500
With an allowance recorded 4,427   4,658
Recorded investment 6,803   6,158
Unpaid principal balance:      
With no related allowance recorded 2,829   1,900
With an allowance recorded 4,443   4,712
Unpaid principal balance 7,272   6,612
Related Allowance 228   215
Average recorded investment:      
With no related allowance recorded 2,004 849  
With an allowance recorded 4,562 2,944  
Average recorded investment 6,566 3,793  
Interest income recognized:      
With no related allowance recorded 14 0  
With an allowance recorded 49 27  
Interest income recognized 63 27  
Residential land      
Recorded investment:      
With no related allowance recorded 954   1,218
With an allowance recorded 1,909   2,411
Recorded investment 2,863   3,629
Unpaid principal balance:      
With no related allowance recorded 1,401   1,803
With an allowance recorded 1,909   2,411
Unpaid principal balance 3,310   4,214
Related Allowance 660   789
Average recorded investment:      
With no related allowance recorded 957 1,590  
With an allowance recorded 2,076 3,378  
Average recorded investment 3,033 4,968  
Interest income recognized:      
With no related allowance recorded 26 16  
With an allowance recorded 37 67  
Interest income recognized 63 83  
Commercial construction      
Recorded investment:      
With no related allowance recorded 0   0
With an allowance recorded 0   0
Recorded investment 0   0
Unpaid principal balance:      
With no related allowance recorded 0   0
With an allowance recorded 0   0
Unpaid principal balance 0   0
Related Allowance 0   0
Average recorded investment:      
With no related allowance recorded 0 0  
With an allowance recorded 0 0  
Average recorded investment 0 0  
Interest income recognized:      
With no related allowance recorded 0 0  
With an allowance recorded 0 0  
Interest income recognized 0 0  
Residential construction      
Recorded investment:      
With no related allowance recorded 0   0
With an allowance recorded 0   0
Recorded investment 0   0
Unpaid principal balance:      
With no related allowance recorded 0   0
With an allowance recorded 0   0
Unpaid principal balance 0   0
Related Allowance 0   0
Average recorded investment:      
With no related allowance recorded 0 0  
With an allowance recorded 0 0  
Average recorded investment 0 0  
Interest income recognized:      
With no related allowance recorded 0 0  
With an allowance recorded 0 0  
Interest income recognized 0 0  
Commercial loans      
Recorded investment:      
With no related allowance recorded 2,315   6,299
With an allowance recorded 6,860   14,240
Recorded investment 9,175   20,539
Unpaid principal balance:      
With no related allowance recorded 5,391   8,869
With an allowance recorded 6,860   14,240
Unpaid principal balance 12,251   23,109
Related Allowance 1,318   1,641
Average recorded investment:      
With no related allowance recorded 4,907 4,999  
With an allowance recorded 7,268 16,970  
Average recorded investment 12,175 21,969  
Interest income recognized:      
With no related allowance recorded 6 6  
With an allowance recorded 401 30  
Interest income recognized 407 36  
Consumer loans      
Recorded investment:      
With no related allowance recorded 0   0
With an allowance recorded 69   10
Recorded investment 69   10
Unpaid principal balance:      
With no related allowance recorded 0   0
With an allowance recorded 69   10
Unpaid principal balance 69   10
Related Allowance 34   $ 6
Average recorded investment:      
With no related allowance recorded 0 0  
With an allowance recorded 30 13  
Average recorded investment 30 13  
Interest income recognized:      
With no related allowance recorded 0 0  
With an allowance recorded 0 0  
Interest income recognized $ 0 $ 0