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Note 14 - Regulatory Matters - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Capital $ 213,649 $ 208,480
Capital to risk weighted assets 0.146 0.148
Capital required for capital adequacy $ 153,337 $ 146,881
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Tier one risk based capital $ 196,922 $ 191,161
Tier one risk based capital to risk weighted assets 0.135 0.137
Tier one risk based capital required for capital adequacy $ 124,130 $ 118,904
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one leverage capital $ 196,922 $ 191,161
Tier one leverage capital to average assets 0.091 0.090
Tier one leverage capital required for capital adequacy $ 86,685 $ 84,585
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Common equity tier one capital $ 196,922 $ 191,161
Common equity tier one risk based capital to risk weighted assets 0.135 0.137
Common equity tier one capital required for capital adequacy $ 102,225 $ 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 $ 15,864 $ 15,603
Capital to risk weighted assets 0.127 0.142
Capital required for capital adequacy $ 13,148 $ 11,562
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 12,522 $ 11,012
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 14,932 $ 14,652
Tier one risk based capital to risk weighted assets 0.119 0.133
Tier one risk based capital required for capital adequacy $ 10,644 $ 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 $ 10,018 $ 8,809
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 14,932 $ 14,652
Tier one leverage capital to average assets 0.090 0.090
Tier one leverage capital required for capital adequacy $ 6,654 $ 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 $ 8,318 $ 8,157
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 14,932 $ 14,652
Common equity tier one risk based capital to risk weighted assets 0.119 0.133
Common equity tier one capital required for capital adequacy $ 8,766 $ 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 $ 8,139 $ 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 $ 109,914 $ 104,608
Capital to risk weighted assets 0.148 0.145
Capital required for capital adequacy $ 78,045 $ 75,832
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 74,328 $ 72,221
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 100,627 $ 95,573
Tier one risk based capital to risk weighted assets 0.135 0.132
Tier one risk based capital required for capital adequacy $ 63,179 $ 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 $ 59,463 $ 57,777
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 100,627 $ 95,573
Tier one leverage capital to average assets 0.090 0.087
Tier one leverage capital required for capital adequacy $ 44,824 $ 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 $ 56,030 $ 55,416
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 100,627 $ 95,573
Common equity tier one risk based capital to risk weighted assets 0.135 0.132
Common equity tier one capital required for capital adequacy $ 52,030 $ 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 $ 48,313 $ 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 $ 24,918 $ 24,008
Capital to risk weighted assets 0.156 0.159
Capital required for capital adequacy $ 16,784 $ 15,895
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 15,985 $ 15,138
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 23,735 $ 22,747
Tier one risk based capital to risk weighted assets 0.148 0.150
Tier one risk based capital required for capital adequacy $ 13,587 $ 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 $ 12,788 $ 12,111
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 23,735 $ 22,747
Tier one leverage capital to average assets 0.091 0.091
Tier one leverage capital required for capital adequacy $ 10,411 $ 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 $ 13,014 $ 12,628
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 23,735 $ 22,747
Common equity tier one risk based capital to risk weighted assets 0.148 0.150
Common equity tier one capital required for capital adequacy $ 11,189 $ 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 $ 10,390 $ 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 $ 28,124 $ 27,292
Capital to risk weighted assets 0.135 0.136
Capital required for capital adequacy $ 21,898 $ 21,136
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 20,855 $ 20,129
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 25,544 $ 24,774
Tier one risk based capital to risk weighted assets 0.122 0.123
Tier one risk based capital required for capital adequacy $ 17,727 $ 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 $ 16,684 $ 16,103
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 25,544 $ 24,774
Tier one leverage capital to average assets 0.087 0.088
Tier one leverage capital required for capital adequacy $ 11,782 $ 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 $ 14,728 $ 14,245
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 25,544 $ 24,774
Common equity tier one risk based capital to risk weighted assets 0.122 0.123
Common equity tier one capital required for capital adequacy $ 14,599 $ 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 $ 13,556 $ 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 $ 21,793 $ 20,885
Capital to risk weighted assets 0.149 0.152
Capital required for capital adequacy $ 15,349 $ 14,416
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 14,618 $ 13,730
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 20,181 $ 19,231
Tier one risk based capital to risk weighted assets 0.138 0.140
Tier one risk based capital required for capital adequacy $ 12,425 $ 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 $ 11,694 $ 10,984
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 20,181 $ 19,231
Tier one leverage capital to average assets 0.088 0.091
Tier one leverage capital required for capital adequacy $ 9,132 $ 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 $ 11,415 $ 10,586
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 20,181 $ 19,231
Common equity tier one risk based capital to risk weighted assets 0.138 0.140
Common equity tier one capital required for capital adequacy $ 10,233 $ 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 $ 9,502 $ 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 $ 12,450 $ 12,001
Capital to risk weighted assets 0.151 0.157
Capital required for capital adequacy $ 8,663 $ 8,039
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 8,250 $ 7,657
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 11,418 $ 11,042
Tier one risk based capital to risk weighted assets 0.138 0.144
Tier one risk based capital required for capital adequacy $ 7,013 $ 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 $ 6,600 $ 6,125
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 11,418 $ 11,042
Tier one leverage capital to average assets 0.085 0.089
Tier one leverage capital required for capital adequacy $ 5,370 $ 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 $ 6,713 $ 6,193
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 11,418 $ 11,042
Common equity tier one risk based capital to risk weighted assets 0.138 0.144
Common equity tier one capital required for capital adequacy $ 5,775 $ 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 $ 5,363 $ 4,977
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%