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Loans and Allowance for Credit Losses on Loans - Loans Balance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Jan. 01, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | $ 2,696,024 |  | $ 2,696,024 |  | $ 2,534,163 |  |  |  |
Deferred loan fees, net | (9,635) |  | (9,635) |  | (319) |  |  |  |
Loans, net of deferred fees | 2,686,389 | $ 1,877,767 | 2,686,389 | $ 1,877,767 | 2,533,844 |  |  |  |
Allowance for credit losses on loans(1) | (45,444) | (26,631) | (45,444) | (26,631) | (23,285) | $ (44,703) | $ (31,855) | $ (27,318) | $ (27,848)
Loans, net | 2,640,945 |  | 2,640,945 |  | 2,510,559 |  |  |  |
Income tax expense | 4,274 | 4,623 | 5,142 | 9,130 |  |  |  |  |
Retained earnings | 87,654 |  | 87,654 |  | 96,741 |  |  |  |
Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 603,345 |  |  |  |
Allowance for credit losses on loans(1) |  | (15,234) |  | (15,234) | (10,453) |  |  | (15,557) | (17,061)
Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 1,897,074 |  |  |  |
Allowance for credit losses on loans(1) |  | (11,307) |  | (11,307) | (12,750) |  |  | (11,671) | (10,671)
Consumer |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 33,744 |  |  |  |
Allowance for credit losses on loans(1) |  | $ (90) |  | $ (90) | (82) |  |  | $ (90) | $ (116)
Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 878,393 |  | 878,393 |  |  |  | 6,790 |  |
Allowance for credit losses on loans(1) | (13,179) |  | (13,179) |  | (10,453) | (12,801) | (6,790) |  |
Commercial | Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 878,393 |  | 878,393 |  | 603,345 |  |  |  |
SBA Paycheck Protection Program ("PPP") loans | Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 324,550 |  | 324,550 |  |  |  |  |  |
CRE - owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 553,463 |  | 553,463 |  |  |  | 6,994 |  |
Allowance for credit losses on loans(1) | (8,547) |  | (8,547) |  | (3,825) | (7,737) | (6,994) |  |
CRE - owner occupied | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 553,463 |  | 553,463 |  | 548,907 |  |  |  |
CRE - non-owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 725,776 |  | 725,776 |  | 767,821 |  | 11,672 |  |
Allowance for credit losses on loans(1) | (15,449) |  | (15,449) |  | (3,760) | (15,645) | (11,672) |  |
CRE - non-owner occupied | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 725,776 |  | 725,776 |  | 767,821 |  |  |  |
Land and construction |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 138,284 |  | 138,284 |  |  |  | 1,458 |  |
Allowance for credit losses on loans(1) | (2,552) |  | (2,552) |  | (2,621) | (2,603) | (1,458) |  |
Land and construction | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 138,284 |  | 138,284 |  | 147,189 |  |  |  |
Home equity |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 112,679 |  | 112,679 |  |  |  | 1,321 |  |
Allowance for credit losses on loans(1) | (1,851) |  | (1,851) |  | (2,244) | (1,746) | (1,321) |  |
Home equity | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 112,679 |  | 112,679 |  | 151,775 |  |  |  |
Multi-family |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 169,637 |  | 169,637 |  |  |  | 1,253 |  |
Allowance for credit losses on loans(1) | (1,828) |  | (1,828) |  | (57) | (1,622) | (1,253) |  |
Multi-family | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 169,637 |  | 169,637 |  | 180,623 |  |  |  |
Residential mortgages |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 95,033 |  | 95,033 |  |  |  | 678 |  |
Allowance for credit losses on loans(1) | (825) |  | (825) |  | (243) | (708) | (678) |  |
Residential mortgages | Real estate |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 95,033 |  | 95,033 |  | 100,759 |  |  |  |
Consumer and other |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | 22,759 |  | 22,759 |  |  |  | 1,689 |  |
Allowance for credit losses on loans(1) | (1,213) |  | (1,213) |  | (82) | $ (1,841) | $ (1,689) |  |
Consumer and other | Consumer |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance | $ 22,759 |  | $ 22,759 |  | 33,744 |  |  |  |
ASU 2016-03 - Topic 326 |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (8,570) |  |  |  |
ASU 2016-03 - Topic 326 | Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | 3,663 |  |  |  |
ASU 2016-03 - Topic 326 | CRE - owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (3,169) |  |  |  |
ASU 2016-03 - Topic 326 | CRE - non-owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (7,912) |  |  |  |
ASU 2016-03 - Topic 326 | Land and construction |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | 1,163 |  |  |  |
ASU 2016-03 - Topic 326 | Home equity |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | 923 |  |  |  |
ASU 2016-03 - Topic 326 | Multi-family |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (1,196) |  |  |  |
ASU 2016-03 - Topic 326 | Residential mortgages |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (435) |  |  |  |
ASU 2016-03 - Topic 326 | Consumer and other |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (1,607) |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (8,570) |  |  |  |
Income tax expense |  |  |  |  | 2,400 |  |  |  |
Retained earnings |  |  |  |  | (6,100) |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | (3,663) |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | CRE - owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 3,169 |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | CRE - non-owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 7,912 |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Land and construction |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | (1,163) |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Home equity |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | (923) |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Multi-family |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 1,196 |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Residential mortgages |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 435 |  |  |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 | Consumer and other |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 1,607 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans(1) |  |  |  |  | (23,285) |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Commercial |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 10,453 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | CRE - owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 3,825 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | CRE - non-owner occupied |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 3,760 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Land and construction |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 2,621 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Home equity |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 2,244 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Multi-family |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 57 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Residential mortgages |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | 243 |  |  |  |
Previously Reported | ASU 2016-03 - Topic 326 | Consumer and other |  |  |  |  |  |  |  |  |
Loans held-for-investment: |  |  |  |  |  |  |  |  |
Total loan balance |  |  |  |  | $ 82 |  |  |  |

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