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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, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | $ 24,343 | $ 15,057
Recorded Investment With No Allowance | 4,856 | 3,241
Recorded Investment With Allowance | 10,831 | 12,150
Total Recorded Investment | 15,687 | 15,391
Related Allowance | 2,579 | 3,064
Average Recorded Investment | 19,722 | 7,366
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 20,750 | 12,341
Recorded Investment With No Allowance | 2,321 | 566
Recorded Investment With Allowance | 10,344 | 11,791
Total Recorded Investment | 12,665 | 12,357
Related Allowance | 2,508 | 2,909
Average Recorded Investment | 16,270 | 4,489
CRE - investor owned |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 560 | 525
Recorded Investment With No Allowance | 422 | 435
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 422 | 435
Related Allowance | 0 | 0
Average Recorded Investment | 521 | 668
CRE - owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 487 | 225
Recorded Investment With No Allowance | 0 | 231
Recorded Investment With Allowance | 487 | 0
Total Recorded Investment | 487 | 231
Related Allowance | 71 | 0
Average Recorded Investment | 490 | 227
Construction and land development |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 441 | 1,904
Recorded Investment With No Allowance | 136 | 1,947
Recorded Investment With Allowance | 0 | 359
Total Recorded Investment | 136 | 2,306
Related Allowance | 0 | 155
Average Recorded Investment | 331 | 1,918
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 1,730 | 62
Recorded Investment With No Allowance | 1,602 | 62
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 1,602 | 62
Related Allowance | 0 | 0
Average Recorded Investment | 1,735 | 64
Consumer and other |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 375 | 0
Recorded Investment With No Allowance | 375 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 375 | 0
Related Allowance | 0 | 0
Average Recorded Investment | $ 375 | $ 0

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