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Loans and Allowance for Loan Losses ("ALLL") - Internal Risk Ratings (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans $ 4,493,114   $ 3,861,707
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 4,015,875   3,727,182
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 177,328   47,629
Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 224,352 $ 200,000 47,221
Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 67,765   34,192
Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 7,794   5,483
Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 1,291,572   1,356,817
Commercial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 1,106,338   1,258,952
Commercial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 71,746   27,069
Commercial | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 75,714   38,666
Commercial | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 34,528   32,130
Commercial | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 3,246   0
Commercial | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Energy      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 384,181   408,573
Energy | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 186,881   392,233
Energy | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 58,726   9,460
Energy | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 117,389   2,340
Energy | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 17,435   0
Energy | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 3,750   4,540
Energy | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 1,195,631   1,024,041
Commercial real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 1,114,802   1,007,921
Commercial real estate | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 41,030   9,311
Commercial real estate | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 26,624   5,746
Commercial real estate | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 12,377   120
Commercial real estate | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 798   943
Commercial real estate | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Construction and land development      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 587,617   628,418
Construction and land development | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 581,160   628,418
Construction and land development | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 5,299   0
Construction and land development | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 1,158   0
Construction and land development | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Construction and land development | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Construction and land development | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 618,082   398,695
Residential real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 610,909   394,495
Residential real estate | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 527   1,789
Residential real estate | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 3,467   469
Residential real estate | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 3,179   1,942
Residential real estate | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Residential real estate | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Paycheck Protection Program (“PPP”)      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 369,260   0
Paycheck Protection Program (“PPP”) | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 369,260   0
Paycheck Protection Program (“PPP”) | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Paycheck Protection Program (“PPP”) | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Paycheck Protection Program (“PPP”) | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Paycheck Protection Program (“PPP”) | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Paycheck Protection Program (“PPP”) | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 46,771   45,163
Consumer | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 46,525   45,163
Consumer | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Consumer | Substandard | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Consumer | Substandard | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 246   0
Consumer | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans 0   0
Consumer | Loss      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross loans $ 0   $ 0