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Note 13 - Regulatory Matters - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Tier one leverage capital   $ 167,544
Tier one leverage capital to average assets   0.101
Capital   $ 180,834
Capital to risk weighted assets   0.143
Capital required for capital adequacy   $ 132,878
Capital required for capital adequacy to risk weighted assets   10.50%
Tier one risk based capital   $ 167,514
Tier one risk based capital to risk weighted assets   0.132
Tier one risk based capital required for capital adequacy   $ 107,568
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one leverage capital required for capital adequacy   $ 66,234
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 167,544
Common equity tier one risk based capital to risk weighted assets   0.132
Common equity tier one capital required for capital adequacy   $ 88,585
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Boone Bank and Trust [Member]    
Tier one leverage capital $ 13,508 $ 13,274
Tier one leverage capital to average assets 0.093 0.095
Tier one leverage capital required to be well capitalized $ 11,658 $ 7,005
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 14,205
Capital to risk weighted assets   0.141
Capital required for capital adequacy   $ 10,610
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 10,105
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 13,274
Tier one risk based capital to risk weighted assets   0.131
Tier one risk based capital required for capital adequacy   $ 8,589
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 8,084
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 5,604
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 13,274
Common equity tier one risk based capital to risk weighted assets   0.131
Common equity tier one capital required for capital adequacy   $ 7,074
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 6,568
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%
First National Bank [Member] | Also Conducts Business Out of 3 Full Service Offices in Des Moines Metro Area [Member]    
Tier one leverage capital $ 84,372 $ 80,665
Tier one leverage capital to average assets 0.087 0.093
Tier one leverage capital required to be well capitalized $ 78,018 $ 43,378
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 87,375
Capital to risk weighted assets   0.139
Capital required for capital adequacy   $ 66,180
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 63,028
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 80,665
Tier one risk based capital to risk weighted assets   0.128
Tier one risk based capital required for capital adequacy   $ 53,574
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 50,423
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 34,702
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 80,665
Common equity tier one risk based capital to risk weighted assets   0.128
Common equity tier one capital required for capital adequacy   $ 44,120
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 40,968
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%
Iowa State Savings Bank [Member]    
Tier one leverage capital $ 20,913 $ 20,151
Tier one leverage capital to average assets 0.094 0.095
Tier one leverage capital required to be well capitalized $ 17,873 $ 10,567
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 20,610
Capital to risk weighted assets   0.142
Capital required for capital adequacy   $ 15,208
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 14,483
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 20,151
Tier one risk based capital to risk weighted assets   0.139
Tier one risk based capital required for capital adequacy   $ 12,311
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 11,587
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 8,453
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 20,151
Common equity tier one risk based capital to risk weighted assets   0.139
Common equity tier one capital required for capital adequacy   $ 10,138
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 9,414
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%
Reliance State Bank [Member] | Conducts Business Out of Offices at Story City, Garner, and Kleme, Iowa [Member]    
Tier one leverage capital $ 22,330 $ 22,166
Tier one leverage capital to average assets 0.098 0.100
Tier one leverage capital required to be well capitalized $ 18,283 $ 11,108
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 24,487
Capital to risk weighted assets   0.130
Capital required for capital adequacy   $ 19,778
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 18,836
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 22,166
Tier one risk based capital to risk weighted assets   0.118
Tier one risk based capital required for capital adequacy   $ 16,010
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 15,069
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 8,886
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 22,166
Common equity tier one risk based capital to risk weighted assets   0.118
Common equity tier one capital required for capital adequacy   $ 13,185
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 12,243
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%
State Bank and Trust [Member]    
Tier one leverage capital $ 15,881 $ 15,233
Tier one leverage capital to average assets 0.088 0.095
Tier one leverage capital required to be well capitalized $ 14,403 $ 7,980
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 16,800
Capital to risk weighted assets   0.135
Capital required for capital adequacy   $ 13,115
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 12,490
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 15,233
Tier one risk based capital to risk weighted assets   0.122
Tier one risk based capital required for capital adequacy   $ 10,617
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 9,992
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 6,384
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 15,233
Common equity tier one risk based capital to risk weighted assets   0.122
Common equity tier one capital required for capital adequacy   $ 8,743
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 8,119
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%
United Bank and Trust [Member]    
Tier one leverage capital $ 10,204 $ 9,955
Tier one leverage capital to average assets 0.096 0.098
Tier one leverage capital required to be well capitalized $ 8,537 $ 5,091
Tier one leverage capital required to be well capitalized to average assets 0.080 0.050
Capital   $ 10,775
Capital to risk weighted assets   0.143
Capital required for capital adequacy   $ 7,910
Capital required for capital adequacy to risk weighted assets   10.50%
Capital required to be well capitalized   $ 7,534
Capital required to be well capitalized to risk weighted assets   0.100
Tier one risk based capital   $ 9,955
Tier one risk based capital to risk weighted assets   0.132
Tier one risk based capital required for capital adequacy   $ 6,403
Tier one risk based capital required for capital adequacy to risk weighted assets   8.50%
Tier one risk based capital required to be well capitalized   $ 6,027
Tier one risk based capital required to be well capitalized to risk weighted assets   0.080
Tier one leverage capital required for capital adequacy   $ 4,073
Tier one leverage capital required for capital adequacy to risk weighted assets   0.0400
Common equity tier one capital   $ 9,955
Common equity tier one risk based capital to risk weighted assets   0.132
Common equity tier one capital required for capital adequacy   $ 5,273
Common equity tier one risk based capital required for capital adequacy to risk weighted assets   7.00%
Common equity tier one capital required to be well capitalized   $ 4,897
Common equity tier one capital required to be well capitalized to risk weighted assets   6.50%