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Note 13 - Regulatory Matters - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Capital $ 211,219 $ 208,480
Capital to risk weighted assets 0.149 0.148
Capital required for capital adequacy $ 148,534 $ 146,881
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Tier one risk based capital $ 194,024 $ 191,161
Tier one risk based capital to risk weighted assets 0.137 0.137
Tier one risk based capital required for capital adequacy $ 120,242 $ 118,904
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one leverage capital $ 194,024 $ 191,161
Tier one leverage capital to average assets 0.091 0.090
Tier one leverage capital required for capital adequacy $ 85,639 $ 84,585
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Common equity tier one capital $ 194,024 $ 191,161
Common equity tier one risk based capital to risk weighted assets 0.137 0.137
Common equity tier one capital required for capital adequacy $ 99,022 $ 97,921
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Boone Bank and Trust [Member]    
Capital $ 15,704 $ 15,603
Capital to risk weighted assets 0.135 0.142
Capital required for capital adequacy $ 12,251 $ 11,562
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 11,668 $ 11,012
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 14,778 $ 14,652
Tier one risk based capital to risk weighted assets 0.127 0.133
Tier one risk based capital required for capital adequacy $ 9,917 $ 9,360
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 9,334 $ 8,809
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 14,778 $ 14,652
Tier one leverage capital to average assets 0.090 0.090
Tier one leverage capital required for capital adequacy $ 6,538 $ 6,525
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 8,172 $ 8,157
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 14,778 $ 14,652
Common equity tier one risk based capital to risk weighted assets 0.127 0.133
Common equity tier one capital required for capital adequacy $ 8,167 $ 7,708
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 7,584 $ 7,158
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%
First National Bank [Member] | Also Conducts Business Out of 3 Full Service Offices in Des Moines Metro Area [Member]    
Capital $ 106,493 $ 104,608
Capital to risk weighted assets 0.145 0.145
Capital required for capital adequacy $ 77,007 $ 75,832
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 73,340 $ 72,221
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 97,319 $ 95,573
Tier one risk based capital to risk weighted assets 0.133 0.132
Tier one risk based capital required for capital adequacy $ 62,339 $ 61,388
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 58,672 $ 57,777
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 97,319 $ 95,573
Tier one leverage capital to average assets 0.089 0.087
Tier one leverage capital required for capital adequacy $ 43,893 $ 44,333
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 54,866 $ 55,416
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 97,319 $ 95,573
Common equity tier one risk based capital to risk weighted assets 0.133 0.132
Common equity tier one capital required for capital adequacy $ 51,338 $ 50,555
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 47,671 $ 46,944
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%
Iowa State Savings Bank [Member]    
Capital $ 24,309 $ 24,008
Capital to risk weighted assets 0.159 0.159
Capital required for capital adequacy $ 16,043 $ 15,895
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 15,280 $ 15,138
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 23,048 $ 22,747
Tier one risk based capital to risk weighted assets 0.151 0.150
Tier one risk based capital required for capital adequacy $ 12,988 $ 12,868
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 12,224 $ 12,111
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 23,048 $ 22,747
Tier one leverage capital to average assets 0.090 0.091
Tier one leverage capital required for capital adequacy $ 10,219 $ 10,102
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 12,774 $ 12,628
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 23,048 $ 22,747
Common equity tier one risk based capital to risk weighted assets 0.151 0.150
Common equity tier one capital required for capital adequacy $ 10,696 $ 10,597
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 9,932 $ 9,840
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%
Reliance State Bank [Member] | Conducts Business Out of Offices at Story City, Garner, and Kleme, Iowa [Member]    
Capital $ 27,424 $ 27,292
Capital to risk weighted assets 0.150 0.136
Capital required for capital adequacy $ 19,235 $ 21,136
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 18,319 $ 20,129
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 25,131 $ 24,774
Tier one risk based capital to risk weighted assets 0.137 0.123
Tier one risk based capital required for capital adequacy $ 15,571 $ 17,110
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 14,655 $ 16,103
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 25,131 $ 24,774
Tier one leverage capital to average assets 0.086 0.088
Tier one leverage capital required for capital adequacy $ 11,642 $ 11,396
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 14,553 $ 14,245
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 25,131 $ 24,774
Common equity tier one risk based capital to risk weighted assets 0.137 0.123
Common equity tier one capital required for capital adequacy $ 12,823 $ 14,091
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 11,907 $ 13,084
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%
State Bank and Trust [Member]    
Capital $ 21,243 $ 20,885
Capital to risk weighted assets 0.148 0.152
Capital required for capital adequacy $ 15,114 $ 14,416
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 14,395 $ 13,730
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 19,590 $ 19,231
Tier one risk based capital to risk weighted assets 0.136 0.140
Tier one risk based capital required for capital adequacy $ 12,235 $ 11,670
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 11,516 $ 10,984
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 19,590 $ 19,231
Tier one leverage capital to average assets 0.089 0.091
Tier one leverage capital required for capital adequacy $ 8,812 $ 8,469
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 11,016 $ 10,586
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 19,590 $ 19,231
Common equity tier one risk based capital to risk weighted assets 0.136 0.140
Common equity tier one capital required for capital adequacy $ 10,076 $ 9,611
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 9,356 $ 8,924
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%
United Bank and Trust [Member]    
Capital $ 12,137 $ 12,001
Capital to risk weighted assets 0.153 0.157
Capital required for capital adequacy $ 8,328 $ 8,039
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 7,931 $ 7,657
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 11,144 $ 11,042
Tier one risk based capital to risk weighted assets 0.141 0.144
Tier one risk based capital required for capital adequacy $ 6,742 $ 6,508
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one risk based capital required to be well capitalized $ 6,345 $ 6,125
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 11,144 $ 11,042
Tier one leverage capital to average assets 0.087 0.089
Tier one leverage capital required for capital adequacy $ 5,137 $ 4,955
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Tier one leverage capital required to be well capitalized $ 6,421 $ 6,193
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 11,144 $ 11,042
Common equity tier one risk based capital to risk weighted assets 0.151 0.144
Common equity tier one capital required for capital adequacy $ 5,552 $ 5,360
Common equity tier one risk based capital required for capital adequacy to risk weighted assets 7.00% 7.00%
Common equity tier one capital required to be well capitalized $ 5,155 $ 4,977
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%