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Loans and Allowance for Credit Losses - Recorded investments in loans related to each balance in the allowance for loan losses by portfolio segment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | $ 68,206
Financing Receivable, Collectively Evaluated for Impairment |  |  | 7,477,542
Net loans | $ 7,760,212 |  | 7,545,748
Commercial |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 25,288
Financing Receivable, Collectively Evaluated for Impairment |  |  | 1,520,618
Net loans | 1,437,433 | $ 1,545,906 | 1,545,906
Income producing - commercial real estate |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 19,093
Financing Receivable, Collectively Evaluated for Impairment |  |  | 3,683,654
Net loans | 3,687,000 | 3,702,747 | 3,702,747
Owner occupied - commercial real estate |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 6,463
Financing Receivable, Collectively Evaluated for Impairment |  |  | 978,946
Net loans | 997,694 | 985,409 | 985,409
Real estate mortgage - residential |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 5,365
Financing Receivable, Collectively Evaluated for Impairment |  |  | 98,856
Net loans | 76,592 | 104,221 | 104,221
Construction - commercial and residential |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 11,510
Financing Receivable, Collectively Evaluated for Impairment |  |  | 1,113,734
Net loans | 873,261 | 1,035,754 | 1,125,244
Home equity |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 487
Financing Receivable, Collectively Evaluated for Impairment |  |  | 79,574
Net loans | 73,167 | 80,061 | 80,061
Other consumer |  |  |
Recorded investment in loans: |  |  |
Financing Receivable, Individually Evaluated for Impairment |  |  | 0
Financing Receivable, Collectively Evaluated for Impairment |  |  | 2,160
Net loans | $ 1,389 | $ 2,160 | $ 2,160

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