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Note 13 - Regulatory Matters - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Tier one leverage capital   $ 167,544
Tier one leverage capital to average assets   0.101
Tier one leverage capital required to be well capitalized  
Tier one leverage capital required to be well capitalized to average assets  
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%
Capital required to be well capitalized  
Capital required to be well capitalized to risk weighted assets  
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 risk based capital required to be well capitalized  
Tier one risk based capital required to be well capitalized to risk weighted assets  
Tier one leverage capital required for capital adequacy   $ 66,234
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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%
Common equity tier one capital required to be well capitalized  
Boone Bank and Trust [Member]    
Tier one leverage capital $ 13,259 $ 13,274
Tier one leverage capital to average assets 0.097 0.095
Tier one leverage capital required to be well capitalized $ 12,328 $ 7,005
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 5,604
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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 $ 83,121 $ 80,665
Tier one leverage capital to average assets 0.091 0.093
Tier one leverage capital required to be well capitalized $ 82,557 $ 43,378
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 34,702
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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 $ 20,597 $ 20,151
Tier one leverage capital to average assets 0.098 0.095
Tier one leverage capital required to be well capitalized $ 18,950 $ 10,567
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 8,453
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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 $ 22,355 $ 22,166
Tier one leverage capital to average assets 0.101 0.1
Tier one leverage capital required to be well capitalized $ 19,849 $ 11,108
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
Capital   $ 24,487
Capital to risk weighted assets   0.13
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 8,886
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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 $ 15,426 $ 15,233
Tier one leverage capital to average assets 0.095 0.095
Tier one leverage capital required to be well capitalized $ 14,565 $ 7,980
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 6,384
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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 $ 10,009 $ 9,955
Tier one leverage capital to average assets 0.1 0.098
Tier one leverage capital required to be well capitalized $ 9,012 $ 5,091
Tier one leverage capital required to be well capitalized to average assets 0.09 0.05
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   0.1
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   0.08
Tier one leverage capital required for capital adequacy   $ 4,073
Tier one leverage capital required for capital adequacy to risk weighted assets   0.04
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%