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Note 14 - Regulatory Matters - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Capital $ 210,832 $ 208,480
Capital to risk weighted assets 0.147 0.148
Capital required for capital adequacy $ 150,412 $ 146,881
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Tier one risk based capital $ 193,637 $ 191,161
Tier one risk based capital to risk weighted assets 0.135 0.137
Tier one risk based capital required for capital adequacy $ 121,762 $ 118,904
Tier one risk based capital required for capital adequacy to risk weighted assets 8.50% 8.50%
Tier one leverage capital $ 193,637 $ 191,161
Tier one leverage capital to average assets 0.087 0.090
Tier one leverage capital required for capital adequacy $ 88,888 $ 84,585
Tier one leverage capital required for capital adequacy to risk weighted assets 0.0400 0.0400
Common equity tier one capital $ 193,637 $ 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 $ 100,274 $ 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 $ 15,753 $ 15,603
Capital to risk weighted assets 0.134 0.142
Capital required for capital adequacy $ 12,381 $ 11,562
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 11,791 $ 11,012
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 14,821 $ 14,652
Tier one risk based capital to risk weighted assets 0.126 0.133
Tier one risk based capital required for capital adequacy $ 10,023 $ 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 $ 9,433 $ 8,809
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 14,821 $ 14,652
Tier one leverage capital to average assets 0.088 0.090
Tier one leverage capital required for capital adequacy $ 6,742 $ 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 $ 8,428 $ 8,157
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 14,821 $ 14,652
Common equity tier one risk based capital to risk weighted assets 0.126 0.133
Common equity tier one capital required for capital adequacy $ 8,254 $ 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 $ 7,664 $ 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 $ 107,876 $ 104,608
Capital to risk weighted assets 0.147 0.145
Capital required for capital adequacy $ 77,145 $ 75,832
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 73,472 $ 72,221
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 98,685 $ 95,573
Tier one risk based capital to risk weighted assets 0.134 0.132
Tier one risk based capital required for capital adequacy $ 62,451 $ 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 $ 58,777 $ 57,777
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 98,685 $ 95,573
Tier one leverage capital to average assets 0.087 0.087
Tier one leverage capital required for capital adequacy $ 45,518 $ 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 $ 56,898 $ 55,416
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 98,685 $ 95,573
Common equity tier one risk based capital to risk weighted assets 0.134 0.132
Common equity tier one capital required for capital adequacy $ 51,430 $ 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 $ 47,757 $ 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 $ 24,493 $ 24,008
Capital to risk weighted assets 0.158 0.159
Capital required for capital adequacy $ 16,291 $ 15,895
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 15,515 $ 15,138
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 23,259 $ 22,747
Tier one risk based capital to risk weighted assets 0.150 0.150
Tier one risk based capital required for capital adequacy $ 13,188 $ 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 $ 12,412 $ 12,111
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 23,259 $ 22,747
Tier one leverage capital to average assets 0.089 0.091
Tier one leverage capital required for capital adequacy $ 10,409 $ 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 $ 13,011 $ 12,628
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 23,259 $ 22,747
Common equity tier one risk based capital to risk weighted assets 0.150 0.150
Common equity tier one capital required for capital adequacy $ 10,861 $ 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 $ 10,085 $ 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 $ 27,773 $ 27,292
Capital to risk weighted assets 0.139 0.136
Capital required for capital adequacy $ 20,971 $ 21,136
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 19,973 $ 20,129
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 25,276 $ 24,774
Tier one risk based capital to risk weighted assets 0.127 0.123
Tier one risk based capital required for capital adequacy $ 16,977 $ 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 $ 15,978 $ 16,103
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 25,276 $ 24,774
Tier one leverage capital to average assets 0.086 0.088
Tier one leverage capital required for capital adequacy $ 11,790 $ 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 $ 14,738 $ 14,245
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 25,276 $ 24,774
Common equity tier one risk based capital to risk weighted assets 0.127 0.123
Common equity tier one capital required for capital adequacy $ 13,981 $ 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 $ 12,982 $ 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 $ 21,448 $ 20,885
Capital to risk weighted assets 0.149 0.152
Capital required for capital adequacy $ 15,161 $ 14,416
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 14,439 $ 13,730
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 19,802 $ 19,231
Tier one risk based capital to risk weighted assets 0.137 0.140
Tier one risk based capital required for capital adequacy $ 12,273 $ 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 $ 11,551 $ 10,984
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 19,802 $ 19,231
Tier one leverage capital to average assets 0.086 0.091
Tier one leverage capital required for capital adequacy $ 9,204 $ 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 $ 11,505 $ 10,586
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 19,802 $ 19,231
Common equity tier one risk based capital to risk weighted assets 0.137 0.140
Common equity tier one capital required for capital adequacy $ 10,107 $ 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 $ 9,385 $ 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 $ 12,170 $ 12,001
Capital to risk weighted assets 0.151 0.157
Capital required for capital adequacy $ 8,454 $ 8,039
Capital required for capital adequacy to risk weighted assets 10.50% 10.50%
Capital required to be well capitalized $ 8,051 $ 7,657
Capital required to be well capitalized to risk weighted assets 0.100 0.100
Tier one risk based capital $ 11,162 $ 11,042
Tier one risk based capital to risk weighted assets 0.139 0.144
Tier one risk based capital required for capital adequacy $ 6,844 $ 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 $ 6,441 $ 6,125
Tier one risk based capital required to be well capitalized to risk weighted assets 0.080 0.080
Tier one leverage capital $ 11,162 $ 11,042
Tier one leverage capital to average assets 0.085 0.089
Tier one leverage capital required for capital adequacy $ 5,271 $ 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 $ 6,589 $ 6,193
Tier one leverage capital required to be well capitalized to average assets 0.050 0.050
Common equity tier one capital $ 11,162 $ 11,042
Common equity tier one risk based capital to risk weighted assets 0.139 0.144
Common equity tier one capital required for capital adequacy $ 5,636 $ 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 $ 5,233 $ 4,977
Common equity tier one capital required to be well capitalized to risk weighted assets 6.50% 6.50%