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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 910,561 | $ 886,190
Total Capital To Risk Weighted Assets Actual Ratio | 14.42% | 16.29%
Capital Required For Capital Adequacy Amount | $ 505,050 | $ 435,208
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 662,878 | $ 537,210
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50% | 9.875%
Common Equity Tier 1 Risk Based Capital Amount | $ 830,323 | $ 808,801
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.15% | 14.87%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 284,091 | $ 244,804
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 | $ 441,919 | $ 346,806
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00% | 6.375%
Tier 1 Risk Based Capital Amount | $ 856,323 | $ 834,801
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.56% | 15.35%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 378,788 | $ 326,406
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 | $ 536,616 | $ 428,408
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50% | 7.875%
Tier 1 Capital Amount | $ 856,323 | $ 834,801
Tier 1 Capital To Average Assets Ratio | 10.28% | 11.09%
Tier 1 Capital Required For Capital Adequacy Amount | $ 333,171 | $ 301,116
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 | $ 827,928 | $ 765,487
Total Capital To Risk Weighted Assets Actual Ratio | 14.14% | 14.09%
Capital Required For Capital Adequacy Amount | $ 468,107 | $ 434,573
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 614,390 | $ 536,426
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50% | 9.875%
Capital Required To Be Well Capitalized Amount | $ 585,134 | $ 543,216
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00% | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 753,659 | $ 694,098
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.88% | 12.78%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 263,310 | $ 244,447
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 | $ 409,594 | $ 346,300
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00% | 6.375%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 380,337 | $ 353,090
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 | $ 773,659 | $ 714,098
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.22% | 13.15%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 351,080 | $ 325,930
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 | $ 497,364 | $ 427,783
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50% | 7.875%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 468,107 | $ 434,573
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00% | 8.00%
Tier 1 Capital Amount | $ 773,659 | $ 714,098
Tier 1 Capital To Average Assets Ratio | 10.22% | 9.49%
Tier 1 Capital Required For Capital Adequacy Amount | $ 302,845 | $ 300,855
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 378,556 | $ 376,069
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00% | 5.00%
Pegasus Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 63,817 |
Total Capital To Risk Weighted Assets Actual Ratio | 14.15% |
Capital Required For Capital Adequacy Amount | $ 36,083 |
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% |
Capital With Capital Conservation Buffer Amount | $ 47,359 |
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50% |
Capital Required To Be Well Capitalized Amount | $ 45,104 |
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00% |
Common Equity Tier 1 Risk Based Capital Amount | $ 60,214 |
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.35% |
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 20,297 |
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% |
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 31,573 |
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00% |
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 29,317 |
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50% |
Tier 1 Risk Based Capital Amount | $ 60,214 |
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.35% |
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 27,062 |
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% |
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 38,338 |
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50% |
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 36,083 |
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00% |
Tier 1 Capital Amount | $ 60,214 |
Tier 1 Capital To Average Assets Ratio | 8.58% |
Tier 1 Capital Required For Capital Adequacy Amount | $ 28,058 |
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% |
Tier 1 Capital Required To Be Well Capitalized Amount | $ 35,072 |
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00% |

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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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