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Bank segment (Details 10) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Recorded investment:      
With no related allowance recorded $ 20,880 $ 20,880 $ 16,487
With an allowance recorded 24,227 24,227 36,031
Recorded investment 45,107 45,107 52,518
Unpaid principal balance:      
With no related allowance recorded 28,875 28,875 21,717
With an allowance recorded 24,811 24,811 39,185
Unpaid principal balance 53,686 53,686 60,902
Related Allowance 2,915 2,915 5,338
Average recorded investment:      
With no related allowance recorded 17,754 16,571 24,631
With an allowance recorded 30,420 33,099 34,679
Average recorded investment 48,174 49,670 59,310
Interest income recognized:      
With no related allowance recorded 76 353 882
With an allowance recorded 856 1,365 1,072
Interest income recognized 932 1,718 1,954
Residential 1-4 family
      
Recorded investment:      
With no related allowance recorded 8,718 8,718 9,708
With an allowance recorded 11,297 11,297 6,216
Recorded investment 20,015 20,015 15,924
Unpaid principal balance:      
With no related allowance recorded 10,398 10,398 12,144
With an allowance recorded 11,338 11,338 6,236
Unpaid principal balance 21,736 21,736 18,380
Related Allowance 917 917 642
Average recorded investment:      
With no related allowance recorded 8,519 9,077 11,674
With an allowance recorded 10,232 8,019 6,455
Average recorded investment 18,751 17,096 18,129
Interest income recognized:      
With no related allowance recorded 30 189 386
With an allowance recorded 112 303 372
Interest income recognized 142 492 758
Commercial real estate
      
Recorded investment:      
With no related allowance recorded 596 596 0
With an allowance recorded 158 158 4,604
Recorded investment 754 754 4,604
Unpaid principal balance:      
With no related allowance recorded 642 642 0
With an allowance recorded 158 158 4,686
Unpaid principal balance 800 800 4,686
Related Allowance 4 4 1,118
Average recorded investment:      
With no related allowance recorded 199 66 802
With an allowance recorded 3,045 4,049 5,745
Average recorded investment 3,244 4,115 6,547
Interest income recognized:      
With no related allowance recorded     0
With an allowance recorded 455 458 152
Interest income recognized 455 458 152
Home equity line of credit
      
Recorded investment:      
With no related allowance recorded 208 208 672
With an allowance recorded 184 184  
Recorded investment 392 392 672
Unpaid principal balance:      
With no related allowance recorded 332 332 1,227
With an allowance recorded 212 212  
Unpaid principal balance 544 544 1,227
Related Allowance 8 8  
Average recorded investment:      
With no related allowance recorded 274 450 623
With an allowance recorded 198 89 0
Average recorded investment 472 539 623
Interest income recognized:      
With no related allowance recorded 0 4 2
With an allowance recorded 1 2  
Interest income recognized 1 6 2
Residential land
      
Recorded investment:      
With no related allowance recorded 2,500 2,500 2,622
With an allowance recorded 6,372 6,372 7,452
Recorded investment 8,872 8,872 10,074
Unpaid principal balance:      
With no related allowance recorded 3,356 3,356 3,612
With an allowance recorded 6,450 6,450 7,623
Unpaid principal balance 9,806 9,806 11,235
Related Allowance 1,171 1,171 1,332
Average recorded investment:      
With no related allowance recorded 2,610 2,823 6,675
With an allowance recorded 6,379 6,685 6,844
Average recorded investment 8,989 9,508 13,519
Interest income recognized:      
With no related allowance recorded 40 138 482
With an allowance recorded 81 301 409
Interest income recognized 121 439 891
Commercial loans
      
Recorded investment:      
With no related allowance recorded 8,858 8,858 3,466
With an allowance recorded 6,200 6,200 17,759
Recorded investment 15,058 15,058 21,225
Unpaid principal balance:      
With no related allowance recorded 14,147 14,147 4,715
With an allowance recorded 6,637 6,637 20,640
Unpaid principal balance 20,784 20,784 25,355
Related Allowance 810 810 2,246
Average recorded investment:      
With no related allowance recorded 6,152 4,145 4,837
With an allowance recorded 10,549 14,249 15,635
Average recorded investment 16,701 18,394 20,472
Interest income recognized:      
With no related allowance recorded 6 22 12
With an allowance recorded 207 301 139
Interest income recognized 213 323 151
Consumer loans
      
Recorded investment:      
With no related allowance recorded 0 0 19
With an allowance recorded 16 16  
Recorded investment 16 16 19
Unpaid principal balance:      
With no related allowance recorded 0 0 19
With an allowance recorded 16 16  
Unpaid principal balance 16 16 19
Related Allowance 5 5  
Average recorded investment:      
With no related allowance recorded 0 10 20
With an allowance recorded 17 8  
Average recorded investment 17 18 20
Interest income recognized:      
With an allowance recorded $ 0 $ 0