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Portfolio Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | $ 40,913 | $ 26,047 |
Recorded Investment With No Allowance | 9,798 | 5,823 |
Recorded Investment With Allowance | 16,627 | 10,922 |
Total Recorded Investment | 26,425 | 16,745 |
Related Allowance | 2,567 | 4,453 |
Average Recorded Investment | 29,540 | 15,573 | $ 19,722
Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | 36,223 | 21,893 |
Recorded Investment With No Allowance | 7,654 | 3,294 |
Recorded Investment With Allowance | 14,924 | 9,656 |
Total Recorded Investment | 22,578 | 12,950 |
Related Allowance | 2,286 | 4,266 |
Average Recorded Investment | 25,423 | 13,827 |
CRE - investor owned |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | 2,988 | 553 |
Recorded Investment With No Allowance | 811 | 398 |
Recorded Investment With Allowance | 1,492 | 0 |
Total Recorded Investment | 2,303 | 398 |
Related Allowance | 247 | 0 |
Average Recorded Investment | 2,457 | 277 |
CRE - owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | 237 | 847 |
Recorded Investment With No Allowance | 213 | 472 |
Recorded Investment With Allowance | 0 | 336 |
Total Recorded Investment | 213 | 808 |
Related Allowance | 0 | 109 |
Average Recorded Investment | 231 | 691 |
Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance | 0 | 0 |
Residential real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | 1,464 | 2,425 |
Recorded Investment With No Allowance | 1,120 | 1,659 |
Recorded Investment With Allowance | 210 | 618 |
Total Recorded Investment | 1,330 | 2,277 |
Related Allowance | 33 | 52 |
Average Recorded Investment | 1,428 | 778 |
Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance | 1 | 329 |
Recorded Investment With No Allowance | 0 | 0 |
Recorded Investment With Allowance | 1 | 312 |
Total Recorded Investment | 1 | 312 |
Related Allowance | 1 | 26 |
Average Recorded Investment | $ 1 | $ 0 |

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