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Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | $ 13,529 | $ 11,640
Financing Receivable, Recorded Investment, 90 Days Past Due | 29,044 | 10,512
Total Past Due | 42,573 | 22,152
Current | 7,182,362 | 5,201,896
Financing Receivable, after Deferred Income Offset | 7,224,935 |
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 8,652 | 5,679
Financing Receivable, Recorded Investment, 90 Days Past Due | 12,928 | 8,212
Total Past Due | 21,580 | 13,891
Current | 3,067,415 | 2,331,932
Financing Receivable, after Deferred Income Offset | 3,088,995 |
Commercial - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 734 | 321
Financing Receivable, Recorded Investment, 90 Days Past Due | 9,301 | 1,492
Total Past Due | 10,035 | 1,813
Current | 1,579,384 | 1,261,168
Financing Receivable, after Deferred Income Offset | 1,589,419 |
CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 328 | 562
Financing Receivable, Recorded Investment, 90 Days Past Due | 4,647 | 213
Total Past Due | 4,975 | 775
Current | 1,493,433 | 677,747
Financing Receivable, after Deferred Income Offset | 1,498,408 |
Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 13 | 308
Financing Receivable, Recorded Investment, 90 Days Past Due | 0 | 0
Total Past Due | 13 | 308
Current | 546,673 | 449,072
Financing Receivable, after Deferred Income Offset | 546,686 |
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 2,071 | 4,689
Financing Receivable, Recorded Investment, 90 Days Past Due | 2,118 | 595
Total Past Due | 4,189 | 5,284
Current | 314,990 | 349,908
Financing Receivable, after Deferred Income Offset | 319,179 |
Other |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 1,731 | 81
Financing Receivable, Recorded Investment, 90 Days Past Due | 50 | 0
Total Past Due | 1,781 | 81
Current | 180,467 | $ 132,069
Financing Receivable, after Deferred Income Offset | $ 182,248 |

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