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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 886,190 | $ 797,015
Total Capital To Risk Weighted Assets Actual Ratio | 16.29% | 15.62%
Capital Required For Capital Adequacy Amount | $ 435,208 | $ 408,234
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 537,210 | $ 472,020
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.875% | 9.25%
Common Equity Tier 1 Risk Based Capital Amount | $ 808,801 | $ 714,349
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.87% | 14.00%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 244,804 | $ 229,632
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 346,806 | $ 293,418
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.375% | 5.75%
Tier 1 Risk Based Capital Amount | $ 834,801 | $ 745,349
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 15.35% | 14.61%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 326,406 | $ 306,175
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 428,408 | $ 369,962
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.875% | 7.25%
Tier 1 Capital Amount | $ 834,801 | $ 745,349
Tier 1 Capital To Average Assets Ratio | 11.09% | 10.44%
Tier 1 Capital Required For Capital Adequacy Amount | $ 301,116 | $ 285,444
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
BancFirst [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 765,487 | $ 714,964
Total Capital To Risk Weighted Assets Actual Ratio | 14.09% | 14.03%
Capital Required For Capital Adequacy Amount | $ 434,573 | $ 407,698
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 536,426 | $ 471,401
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.875% | 9.25%
Capital Required To Be Well Capitalized Amount | $ 543,216 | $ 509,622
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00% | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 694,098 | $ 643,298
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.78% | 12.62%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 244,447 | $ 229,330
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 346,300 | $ 293,033
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.375% | 5.75%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 353,090 | $ 331,255
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50% | 6.50%
Tier 1 Risk Based Capital Amount | $ 714,098 | $ 663,298
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.15% | 13.02%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 325,930 | $ 306,773
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 427,783 | $ 369,476
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.875% | 7.25%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 434,573 | $ 407,698
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00% | 8.00%
Tier 1 Capital Amount | $ 714,098 | $ 663,298
Tier 1 Capital To Average Assets Ratio | 9.49% | 9.31%
Tier 1 Capital Required For Capital Adequacy Amount | $ 300,855 | $ 285,101
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 376,069 | $ 356,677
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00% | 5.00%

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