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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | 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 |  | $ 24,905 |  |
Total Recorded Investment |  | 37,204 |  | $ 26,425
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (304) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 801 |  |
Financing receivable, allowance for credit loss | 69,995 | 92,187 |  | 43,288
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 28,387 |  |  |
Provision for credit losses | 1,680 | (21,695) | $ (1,500) |
Portfolio loans, net | Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 17,915 |  |
Total Recorded Investment |  | 26,531 |  | 22,578
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (63) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 504 |  |
Financing receivable, allowance for credit loss | 33,949 | 45,981 |  | 27,455
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 6,494 |  |  |
Provision for credit losses | 0 | (11,591) |  |
Portfolio loans, net | Commercial - investor owned |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 2,576 |  |
Total Recorded Investment |  | 4,115 |  | 2,303
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (2) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 14 |  |
Financing receivable, allowance for credit loss | 16,656 | 19,892 |  | 5,935
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 10,726 |  |  |
Provision for credit losses | 5 | (3,224) |  |
Portfolio loans, net | Commercial - owner occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 1,114 |  |
Total Recorded Investment |  | 2,110 |  | 213
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 69 |  |
Financing receivable, allowance for credit loss | 7,414 | 9,477 |  | 4,873
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 2,598 |  |  |
Provision for credit losses | 57 | (1,994) |  |
Portfolio loans, net | Construction and land development |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 214 |  |
Total Recorded Investment |  | 214 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (31) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 40 |  |
Financing receivable, allowance for credit loss | 7,577 | 9,895 |  | 2,611
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 5,183 |  |  |
Provision for credit losses | 217 | (2,309) |  |
Portfolio loans, net | Residential real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 3,086 |  |
Total Recorded Investment |  | 4,154 |  | 1,330
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (122) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 157 |  |
Financing receivable, allowance for credit loss | 3,349 | 5,395 |  | 1,280
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 3,470 |  |  |
Provision for credit losses | 1,401 | (2,011) |  |
Portfolio loans, net | Consumer and other |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment With No Allowance |  | 0 |  |
Total Recorded Investment |  | 80 |  | 1
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (86) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  | 17 |  |
Financing receivable, allowance for credit loss | 1,050 | 1,547 |  | $ 1,134
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (84) |  |  |
Provision for credit losses | $ 0 | $ (566) |  |

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