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Minimum Capital Requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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FB Financial Corporation |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to risk-weighted assets), Actual Amount | $ 516,889 | $ 338,893
Total Capital (to risk-weighted assets), Actual Ratio | 19.14% | 13.03%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 216,046 | $ 208,069
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 249,803 | $ 224,325
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 9.25% | 8.63%
Tier 1 Capital (to risk-weighted assets), Actual Amount | $ 493,642 | $ 317,146
Tier 1 Capital (to risk-weighted assets), Actual Ratio | 18.28% | 12.19%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 162,027 | $ 156,101
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 6.00% | 6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 195,783 | $ 172,362
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 7.25% | 6.63%
Tier 1 Capital (to average assets), Actual Amount | $ 493,642 | $ 317,146
Tier 1 Capital (to average assets), Actual Ratio | 15.54% | 10.05%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount | $ 127,064 | $ 126,227
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio | 4.00% | 4.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount | $ 463,642 | $ 287,146
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio | 17.16% | 11.04%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 121,584 | $ 117,043
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 4.50% | 4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 155,358 | $ 133,299
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 5.75% | 5.13%
FirstBank |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital (to risk-weighted assets), Actual Amount | $ 330,106 | $ 304,018
Total Capital (to risk-weighted assets), Actual Ratio | 12.26% | 11.72%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 215,404 | $ 207,521
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 249,060 | $ 223,733
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 9.25% | 8.63%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount | $ 269,254 | $ 259,401
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio | 10.00% | 10.00%
Tier 1 Capital (to risk-weighted assets), Actual Amount | $ 306,859 | $ 282,271
Tier 1 Capital (to risk-weighted assets), Actual Ratio | 11.40% | 10.88%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 161,505 | $ 155,664
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 6.00% | 6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 195,152 | $ 171,879
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 7.25% | 6.63%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount | $ 161,505 | $ 155,664
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Ratio | 6.00% | 6.00%
Tier 1 Capital (to average assets), Actual Amount | $ 306,859 | $ 282,271
Tier 1 Capital (to average assets), Actual Ratio | 9.67% | 8.95%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount | $ 126,932 | $ 126,155
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio | 4.00% | 4.00%
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Amount | $ 158,665 | $ 157,693
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Ratio | 5.00% | 5.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount | $ 306,859 | $ 282,271
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio | 11.40% | 10.88%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 121,129 | $ 116,748
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 4.50% | 4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount | $ 154,775 | $ 132,963
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio | 5.75% | 5.13%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount | $ 174,963 | $ 168,636
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio | 6.50% | 6.50%

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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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