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Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance | $ 43,288 |  |  |  |
Portfolio loans, net |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 28,387 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | $ 18,391 |  | $ 40,086 |
Balance at December 31, 2019 | 43,288 | 92,187 |  | 43,288 |
Provision for credit losses | (1,680) | 18,400 | $ 1,700 | 40,100 | $ 3,200
Charge-offs |  | (3,664) |  | (3,968) |
Recoveries |  | 3,356 |  | 4,157 |
Balance | 69,995 | 110,270 |  | 110,270 |
Portfolio loans, net | Commercial and industrial |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 6,494 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 7,168 |  | 18,759 |
Balance at December 31, 2019 | 27,455 | 45,981 |  | 27,455 |
Provision for credit losses | 0 |  |  |  |
Charge-offs |  | (3,303) |  | (3,366) |
Recoveries |  | 293 |  | 797 |
Balance | 33,949 | 50,139 |  | 50,139 |
Portfolio loans, net | CRE - investor owned |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 10,726 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 2,599 |  | 5,823 |
Balance at December 31, 2019 | 5,935 | 19,892 |  | 5,935 |
Provision for credit losses | (5) |  |  |  |
Charge-offs |  | (224) |  | (226) |
Recoveries |  | 2,752 |  | 2,766 |
Balance | 16,656 | 25,019 |  | 25,019 |
Portfolio loans, net | CRE - owner occupied |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 2,598 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 1,600 |  | 3,594 |
Balance at December 31, 2019 | 4,873 | 9,477 |  | 4,873 |
Provision for credit losses | (57) |  |  |  |
Charge-offs |  | 0 |  | 0 |
Recoveries |  | 11 |  | 80 |
Balance | 7,414 | 11,088 |  | 11,088 |
Portfolio loans, net | Construction and land development |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 5,183 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 6,038 |  | 8,347 |
Balance at December 31, 2019 | 2,611 | 9,895 |  | 2,611 |
Provision for credit losses | (217) |  |  |  |
Charge-offs |  | 0 |  | (31) |
Recoveries |  | 29 |  | 69 |
Balance | 7,577 | 15,962 |  | 15,962 |
Portfolio loans, net | Residential real estate |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 3,470 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 744 |  | 2,755 |
Balance at December 31, 2019 | 1,280 | 5,395 |  | 1,280 |
Provision for credit losses | (1,401) |  |  |  |
Charge-offs |  | (32) |  | (154) |
Recoveries |  | 226 |  | 383 |
Balance | 3,349 | 6,333 |  | 6,333 |
Portfolio loans, net | Other |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (84) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 242 |  | 808 |
Balance at December 31, 2019 | 1,134 | 1,547 |  | 1,134 |
Provision for credit losses | 0 |  |  |  |
Charge-offs |  | (105) |  | (191) |
Recoveries |  | 45 |  | 62 |
Balance | $ 1,050 | $ 1,729 |  | $ 1,729 |

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