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Note 16 - Regulatory Capital Requirements and Restrictions on Dividends (Details) - Capital Requirements - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Parent Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital actual amount $ 280,273  
Total risk-based capital actual ratio 13.11% 8.00%
Total risk-based capital for capital adequacy purposes amount $ 170,969 [1]
Total risk-based capital for capital adequacy purposes ratio 8.00% [1]
Total risk-based capital to be well capitalized under prompt corrective action provisions amount $ 213,711  
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio 10.00%  
Total risk-based capital new Basel III minimums amount   $ 204,376
Total risk-based capital new Basel III minimums ratio   149876.00%
Tier 1 risk-based capital actual amount $ 253,891  
Tier 1 risk-based capital actual ratio 11.88% 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount $ 128,227 [1]
Tier 1 risk-based capital for capital adequacy purposes ratio 6.00% [1]
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount $ 170,969  
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio 8.00%  
Tier 1 risk-based capital new Basel III minimums amount   $ 178,364
Tier 1 risk-based capital new Basel III minimums ratio   74938.00%
Tier 1 leverage actual amount $ 253,891  
Tier 1 leverage actual ratio 9.75% 4.00%
Tier 1 leverage for capital adequacy purposes amount $ 104,163 [1]
Tier 1 leverage for capital adequacy purposes ratio 4.00% [1]
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount $ 130,203  
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio 5.00%  
Tier 1 leverage new Basel III minimums amount   $ 178,364
Tier 1 leverage new Basel III minimums ratio   93658.00%
Common equity Tier 1 actual amount $ 220,800  
Common equity Tier 1 actual ratio 10.33%  
Common equity Tier 1 capital adequacy purposes amount [1] $ 96,170  
Common equity Tier 1 capital adequacy purposes ratio [1] 4.50%  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount $ 138,912  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio 6.50%  
Quad City Bank and Trust Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital actual amount $ 135,477  
Total risk-based capital actual ratio 12.50% 8.00%
Total risk-based capital for capital adequacy purposes amount $ 86,726 [1] $ 93,119
Total risk-based capital for capital adequacy purposes ratio 8.00% [1] 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount $ 108,407  
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio 10.00%  
Total risk-based capital new Basel III minimums amount   $ 104,869
Total risk-based capital new Basel III minimums ratio   74495.00%
Tier 1 risk-based capital actual amount $ 123,498  
Tier 1 risk-based capital actual ratio 11.39% 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount $ 65,044 [1] $ 55,872
Tier 1 risk-based capital for capital adequacy purposes ratio 6.00% [1] 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount $ 86,726  
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio 8.00%  
Tier 1 risk-based capital new Basel III minimums amount   $ 93,785
Tier 1 risk-based capital new Basel III minimums ratio   37248.00%
Tier 1 leverage actual amount $ 123,498  
Tier 1 leverage actual ratio 8.87% 4.00%
Tier 1 leverage for capital adequacy purposes amount $ 55,718 [1] $ 66,021
Tier 1 leverage for capital adequacy purposes ratio 4.00% [1] 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount $ 69,648  
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio 5.00%  
Tier 1 leverage new Basel III minimums amount   $ 93,785
Tier 1 leverage new Basel III minimums ratio   52817.00%
Common equity Tier 1 actual amount $ 123,498  
Common equity Tier 1 actual ratio 11.39%  
Common equity Tier 1 capital adequacy purposes amount [1] $ 48,783  
Common equity Tier 1 capital adequacy purposes ratio [1] 4.50%  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount $ 70,465  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio 6.50%  
Cedar Rapids Bank and Trust [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital actual amount $ 105,285  
Total risk-based capital actual ratio 14.39% 8.00%
Total risk-based capital for capital adequacy purposes amount $ 58,537 [1] $ 66,407
Total risk-based capital for capital adequacy purposes ratio 8.00% [1] 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount $ 73,172  
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio 10.00%  
Total risk-based capital new Basel III minimums amount   $ 76,662
Total risk-based capital new Basel III minimums ratio   53126.00%
Tier 1 risk-based capital actual amount $ 96,118  
Tier 1 risk-based capital actual ratio 13.14% 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount $ 43,903 [1] $ 39,844
Tier 1 risk-based capital for capital adequacy purposes ratio 6.00% [1] 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount $ 58,537  
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio 8.00%  
Tier 1 risk-based capital new Basel III minimums amount   $ 68,772
Tier 1 risk-based capital new Basel III minimums ratio   26563.00%
Tier 1 leverage actual amount $ 96,118  
Tier 1 leverage actual ratio 10.96% 4.00%
Tier 1 leverage for capital adequacy purposes amount $ 35,079 [1] $ 41,906
Tier 1 leverage for capital adequacy purposes ratio 4.00% [1] 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount $ 43,848  
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio 5.00%  
Tier 1 leverage new Basel III minimums amount   $ 68,772
Tier 1 leverage new Basel III minimums ratio   33525.00%
Common equity Tier 1 actual amount $ 96,118  
Common equity Tier 1 actual ratio 13.14%  
Common equity Tier 1 capital adequacy purposes amount [1] $ 32,927  
Common equity Tier 1 capital adequacy purposes ratio [1] 4.50%  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount $ 47,562  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio 6.50%  
Rockford Bank and Trust [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital actual amount $ 38,544  
Total risk-based capital actual ratio 11.96% 8.00%
Total risk-based capital for capital adequacy purposes amount $ 25,772 [1] $ 28,594
Total risk-based capital for capital adequacy purposes ratio 8.00% [1] 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount $ 32,216  
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio 10.00%  
Total risk-based capital new Basel III minimums amount   $ 35,906
Total risk-based capital new Basel III minimums ratio   22875.00%
Tier 1 risk-based capital actual amount $ 34,514  
Tier 1 risk-based capital actual ratio 10.71% 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount $ 19,329 [1] $ 17,156
Tier 1 risk-based capital for capital adequacy purposes ratio 6.00% [1] 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount $ 25,772  
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio 8.00%  
Tier 1 risk-based capital new Basel III minimums amount   $ 32,325
Tier 1 risk-based capital new Basel III minimums ratio   11438.00%
Tier 1 leverage actual amount $ 34,514  
Tier 1 leverage actual ratio 9.59% 4.00%
Tier 1 leverage for capital adequacy purposes amount $ 14,401 [1] $ 17,640
Tier 1 leverage for capital adequacy purposes ratio 4.00% [1] 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount $ 18,001  
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio 5.00%  
Tier 1 leverage new Basel III minimums amount   $ 32,325
Tier 1 leverage new Basel III minimums ratio   14112.00%
Common equity Tier 1 actual amount $ 34,514  
Common equity Tier 1 actual ratio 10.71%  
Common equity Tier 1 capital adequacy purposes amount [1] $ 14,497  
Common equity Tier 1 capital adequacy purposes ratio [1] 4.50%  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount $ 20,940  
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio 6.50%  
[1] The minimums under Basel III phase in higher by .625% (the capital conservation buffer) annually until 2019. The fully phased-in minimums are 10.5% (Total risk-based capital), 8.5% (Tier 1 risk-based capital), and 7.0% (Common equity Tier 1). Currently, the New Basel III minimums mirror the minimums required for capital adequacy purposes. The first phase-in of the Basel III capital conservation buffer will occur in 2016.