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Loans and Allowance for Loan Leases - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Allowance for loan losses      
Beginning balance $ 56,896 $ 37,826  
Provision charged to expense 13,950 2,850  
Charge-offs (19,460) (1,264)  
Recoveries 72 589  
Ending balance 51,458 40,001  
Ending balance      
Individually evaluated for impairment 6,090   $ 22,298
Collectively evaluated for impairment 45,368   34,598
Allocated to loans:      
Individually evaluated for impairment 108,434   93,500
Collectively evaluated for impairment 3,902,735   3,768,207
Total Loans Receivable 4,011,169   3,861,707
Commercial      
Allowance for loan losses      
Beginning balance 35,864 16,584  
Provision charged to expense 3,271 5,163  
Charge-offs (18,077) (1,254)  
Recoveries 71 13  
Ending balance 21,129 20,506  
Ending balance      
Individually evaluated for impairment 3,228   19,942
Collectively evaluated for impairment 17,901   15,922
Allocated to loans:      
Individually evaluated for impairment 71,983   70,876
Collectively evaluated for impairment 1,283,740   1,285,941
Total Loans Receivable 1,355,723   1,356,817
Energy      
Allowance for loan losses      
Beginning balance 6,565 10,262  
Provision charged to expense 2,313 (3,748)  
Charge-offs (1,279) 0  
Recoveries 0 576  
Ending balance 7,599 7,090  
Ending balance      
Individually evaluated for impairment 1,224   1,949
Collectively evaluated for impairment 6,375   4,616
Allocated to loans:      
Individually evaluated for impairment 15,703   9,744
Collectively evaluated for impairment 383,094   398,829
Total Loans Receivable 398,797   408,573
Commercial real estate      
Allowance for loan losses      
Beginning balance 8,085 6,755  
Provision charged to expense 4,538 716  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 12,623 7,471  
Ending balance      
Individually evaluated for impairment 1,449   210
Collectively evaluated for impairment 11,174   7,875
Allocated to loans:      
Individually evaluated for impairment 14,840   10,492
Collectively evaluated for impairment 1,069,844   1,013,549
Total Loans Receivable 1,084,684   1,024,041
Construction and land development      
Allowance for loan losses      
Beginning balance 3,516 2,475  
Provision charged to expense 1,505 110  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 5,021 2,585  
Ending balance      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 5,021   3,516
Allocated to loans:      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 625,145   628,418
Total Loans Receivable 625,145   628,418
Residential real estate      
Allowance for loan losses      
Beginning balance 2,546 1,464  
Provision charged to expense 2,141 583  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 4,687 2,047  
Ending balance      
Individually evaluated for impairment 189   197
Collectively evaluated for impairment 4,498   2,349
Allocated to loans:      
Individually evaluated for impairment 5,654   2,388
Collectively evaluated for impairment 498,048   396,307
Total Loans Receivable 503,702   398,695
Consumer      
Allowance for loan losses      
Beginning balance 320 286  
Provision charged to expense 182 26  
Charge-offs (104) (10)  
Recoveries 1 0  
Ending balance 399 $ 302  
Ending balance      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 399   320
Allocated to loans:      
Individually evaluated for impairment 254   0
Collectively evaluated for impairment 42,864   45,163
Total Loans Receivable $ 43,118   $ 45,163