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Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Portfolio loans, net - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | $ 131,527 | $ 92,187 | $ 136,671 | $ 43,288
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | $ 28,387 |  |  |  |
Provision for credit losses | (1,680) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | (2,473) | 18,391 | (1,970) | 40,086
Charge-offs |  | (1,832) | (3,664) | (8,306) | (3,968)
Recoveries |  | 963 | 3,356 | 1,790 | 4,157
Balance | 43,288 | 128,185 | 110,270 | 128,185 | 110,270
Commercial and industrial |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 55,941 | 45,981 | 58,812 | 27,455
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 6,494 |  |  |  |
Provision for credit losses | 0 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | (1,839) | 7,168 | (1,298) | 18,759
Charge-offs |  | (1,451) | (3,303) | (5,190) | (3,366)
Recoveries |  | 700 | 293 | 1,027 | 797
Balance | 27,455 | 53,351 | 50,139 | 53,351 | 50,139
CRE - investor owned |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 33,105 | 19,892 | 32,062 | 5,935
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 10,726 |  |  |  |
Provision for credit losses | (5) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 2,859 | 2,599 | 6,240 | 5,823
Charge-offs |  | 0 | (224) | (2,372) | (226)
Recoveries |  | 39 | 2,752 | 73 | 2,766
Balance | 5,935 | 36,003 | 25,019 | 36,003 | 25,019
CRE - owner occupied |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 20,219 | 9,477 | 17,012 | 4,873
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 2,598 |  |  |  |
Provision for credit losses | (57) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | (4,449) | 1,600 | (1,223) | 3,594
Charge-offs |  | (216) | 0 | (244) | 0
Recoveries |  | 10 | 11 | 19 | 80
Balance | 4,873 | 15,564 | 11,088 | 15,564 | 11,088
Construction and land development |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 14,557 | 9,895 | 21,413 | 2,611
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 5,183 |  |  |  |
Provision for credit losses | (217) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | (2,957) | 6,038 | (10,048) | 8,347
Charge-offs |  | 0 | 0 | 0 | (31)
Recoveries |  | 32 | 29 | 267 | 69
Balance | 2,611 | 11,632 | 15,962 | 11,632 | 15,962
Residential real estate |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 4,305 | 5,395 | 4,585 | 1,280
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 3,470 |  |  |  |
Provision for credit losses | (1,401) |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 255 | 744 | 103 | 2,755
Charge-offs |  | (44) | (32) | (315) | (154)
Recoveries |  | 161 | 226 | 304 | 383
Balance | 1,280 | 4,677 | 6,333 | 4,677 | 6,333
Other |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  | 3,400 | 1,547 | 2,787 | 1,134
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (84) |  |  |  |
Provision for credit losses | 0 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 3,658 | 242 | 4,256 | 808
Charge-offs |  | (121) | (105) | (185) | (191)
Recoveries |  | 21 | 45 | 100 | 62
Balance | $ 1,134 | $ 6,958 | $ 1,729 | $ 6,958 | $ 1,729

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