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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by 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 | Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | $ 43,288 |  |  |  |  |  |
Portfolio loans, net |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | $ 27,284 |  | $ 27,284 |  |  |
Total Recorded Investment |  | 41,473 |  | 41,473 |  |  | $ 26,425
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (3,664) |  | (3,968) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 3,356 |  | 4,157 |  |  |
Financing receivable, allowance for credit loss | 69,995 | 110,270 |  | 110,270 |  | $ 92,187 | 43,288
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 28,387 |  |  |  |  |  |
Provision for credit losses | 1,680 | (18,400) | $ (1,700) | (40,100) | $ (3,200) |  |
Portfolio loans, net | Commercial and industrial |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 20,553 |  | 20,553 |  |  |
Total Recorded Investment |  | 31,938 |  | 31,938 |  |  | 22,578
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (3,303) |  | (3,366) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 293 |  | 797 |  |  |
Financing receivable, allowance for credit loss | 33,949 | 50,139 |  | 50,139 |  | 45,981 | 27,455
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 6,494 |  |  |  |  |  |
Provision for credit losses | 0 |  |  |  |  |  |
Portfolio loans, net | Commercial - investor owned |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 1,677 |  | 1,677 |  |  |
Total Recorded Investment |  | 2,389 |  | 2,389 |  |  | 2,303
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (224) |  | (226) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 2,752 |  | 2,766 |  |  |
Financing receivable, allowance for credit loss | 16,656 | 25,019 |  | 25,019 |  | 19,892 | 5,935
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 10,726 |  |  |  |  |  |
Provision for credit losses | 5 |  |  |  |  |  |
Portfolio loans, net | Commercial - owner occupied |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 1,403 |  | 1,403 |  |  |
Total Recorded Investment |  | 2,400 |  | 2,400 |  |  | 213
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 11 |  | 80 |  |  |
Financing receivable, allowance for credit loss | 7,414 | 11,088 |  | 11,088 |  | 9,477 | 4,873
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 2,598 |  |  |  |  |  |
Provision for credit losses | 57 |  |  |  |  |  |
Portfolio loans, net | Construction and land development |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 207 |  | 207 |  |  |
Total Recorded Investment |  | 207 |  | 207 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 |  | (31) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 29 |  | 69 |  |  |
Financing receivable, allowance for credit loss | 7,577 | 15,962 |  | 15,962 |  | 9,895 | 2,611
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 5,183 |  |  |  |  |  |
Provision for credit losses | 217 |  |  |  |  |  |
Portfolio loans, net | Residential real estate |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 3,444 |  | 3,444 |  |  |
Total Recorded Investment |  | 4,499 |  | 4,499 |  |  | 1,330
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (32) |  | (154) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 226 |  | 383 |  |  |
Financing receivable, allowance for credit loss | 3,349 | 6,333 |  | 6,333 |  | 5,395 | 1,280
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 3,470 |  |  |  |  |  |
Provision for credit losses | 1,401 |  |  |  |  |  |
Portfolio loans, net | Other |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Recorded Investment With No Allowance |  | 0 |  | 0 |  |  |
Total Recorded Investment |  | 40 |  | 40 |  |  | 1
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (105) |  | (191) |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 45 |  | 62 |  |  |
Financing receivable, allowance for credit loss | 1,050 | $ 1,729 |  | $ 1,729 |  | $ 1,547 | $ 1,134
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (84) |  |  |  |  |  |
Provision for credit losses | $ 0 |  |  |  |  |  |

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