Loans and ALLL (Past due and current loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days $ 5,850 $ 4,627
Accruing Interest and Past Due: 60-89 Days 1,652 543
Accruing Interest and Pass Due: 90 Days or More 142 428
Nonaccrual 3,244 7,303
Total Past Due and Nonaccrual 10,888 12,901
Current 797,149 759,852
Total 808,037 772,753
Commercial real estate [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 1,226 1,304
Accruing Interest and Past Due: 60-89 Days 296 161
Accruing Interest and Pass Due: 90 Days or More 0 63
Nonaccrual 1,136 2,544
Total Past Due and Nonaccrual 2,658 4,072
Current 289,202 271,548
Total 291,860 275,620
Commercial other [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 368 606
Accruing Interest and Past Due: 60-89 Days 15 0
Accruing Interest and Pass Due: 90 Days or More 13 40
Nonaccrual 238 2,294
Total Past Due and Nonaccrual 634 2,940
Current 99,610 92,945
Total 100,244 95,885
Total commercial [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 1,594 1,910
Accruing Interest and Past Due: 60-89 Days 311 161
Accruing Interest and Pass Due: 90 Days or More 13 103
Nonaccrual 1,374 4,838
Total Past Due and Nonaccrual 3,292 7,012
Current 388,812 364,493
Total 392,104 371,505
Agricultural real estate [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 34 0
Accruing Interest and Past Due: 60-89 Days 295 0
Accruing Interest and Pass Due: 90 Days or More 0 0
Nonaccrual 0 0
Total Past Due and Nonaccrual 329 0
Current 58,928 49,393
Total 59,257 49,393
Agricultural other [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 0 90
Accruing Interest and Past Due: 60-89 Days 0 0
Accruing Interest and Pass Due: 90 Days or More 0 0
Nonaccrual 0 169
Total Past Due and Nonaccrual 0 259
Current 33,332 33,954
Total 33,332 34,213
Total agricultural [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 34 90
Accruing Interest and Past Due: 60-89 Days 295 0
Accruing Interest and Pass Due: 90 Days or More 0 0
Nonaccrual 0 169
Total Past Due and Nonaccrual 329 259
Current 92,260 83,347
Total 92,589 83,606
Residential real estate senior liens [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 3,441 2,000
Accruing Interest and Past Due: 60-89 Days 986 346
Accruing Interest and Pass Due: 90 Days or More 129 320
Nonaccrual 1,765 2,064
Total Past Due and Nonaccrual 6,321 4,730
Current 229,865 223,532
Total 236,186 228,262
Residential real estate junior liens [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 408 232
Accruing Interest and Past Due: 60-89 Days 44 0
Accruing Interest and Pass Due: 90 Days or More 0 0
Nonaccrual 29 50
Total Past Due and Nonaccrual 481 282
Current 13,074 16,207
Total 13,555 16,489
Residential real estate home equity lines of credit [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 181 237
Accruing Interest and Past Due: 60-89 Days 0 0
Accruing Interest and Pass Due: 90 Days or More 0 0
Nonaccrual 25 182
Total Past Due and Nonaccrual 206 419
Current 39,984 38,978
Total 40,190 39,397
Total residential real estate [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 4,030 2,469
Accruing Interest and Past Due: 60-89 Days 1,030 346
Accruing Interest and Pass Due: 90 Days or More 129 320
Nonaccrual 1,819 2,296
Total Past Due and Nonaccrual 7,008 5,431
Current 282,923 278,717
Total 289,931 284,148
Consumer secured [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 167 127
Accruing Interest and Past Due: 60-89 Days 11 33
Accruing Interest and Pass Due: 90 Days or More 0 4
Nonaccrual 50 0
Total Past Due and Nonaccrual 228 164
Current 28,444 28,118
Total 28,672 28,282
Consumer unsecured [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 25 31
Accruing Interest and Past Due: 60-89 Days 5 3
Accruing Interest and Pass Due: 90 Days or More 0 1
Nonaccrual 1 0
Total Past Due and Nonaccrual 31 35
Current 4,710 5,177
Total 4,741 5,212
Total consumer [Member]
    
Credit quality indicators for residential real estate and consumer loans is the individual loan's past due aging    
Accruing Interest and Past Due: 30-59 Days 192 158
Accruing Interest and Past Due: 60-89 Days 16 36
Accruing Interest and Pass Due: 90 Days or More 0 5
Nonaccrual 51 0
Total Past Due and Nonaccrual 259 199
Current 33,154 33,295
Total $ 33,413 $ 33,494