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Loans and Allowance for Loan Losses ("ALLL") - Allowance for loan losses - Previous GAAP (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment $ 5,597      
Collectively evaluated for impairment 52,778      
Ending balance 58,375 $ 64,152 $ 75,493 $ 75,295
Allocated to loans:        
Individually evaluated for impairment 56,927      
Collectively evaluated for impairment 4,212,693      
Ending balance 4,269,620      
Commercial and Industrial        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 333      
Collectively evaluated for impairment 20,019      
Ending balance 20,352 23,921 28,433 24,693
Allocated to loans:        
Individually evaluated for impairment 5,739      
Collectively evaluated for impairment 1,395,942      
Ending balance 1,401,681      
Energy        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 2,100      
Collectively evaluated for impairment 7,129      
Ending balance 9,229 12,548 17,849 18,341
Allocated to loans:        
Individually evaluated for impairment 16,204      
Collectively evaluated for impairment 262,656      
Ending balance 278,860      
Commercial real estate        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 3,164      
Collectively evaluated for impairment 15,955      
Ending balance 19,119 18,945 19,181 22,354
Allocated to loans:        
Individually evaluated for impairment 31,597      
Collectively evaluated for impairment 1,249,498      
Ending balance 1,281,095      
Construction and land development        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 3,749      
Ending balance 3,749 3,191 3,885 3,612
Allocated to loans:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 578,758      
Ending balance 578,758      
Residential and Multifamily Real Estate [Member]        
Period end allowance for loan losses allocated to:        
Ending balance 5,598 5,270 5,826 5,842
Allocated to loans:        
Ending balance 600,816      
Residential real estate        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 5,598      
Allocated to loans:        
Individually evaluated for impairment 3,387      
Collectively evaluated for impairment 597,429      
Paycheck Protection Program ("PPP")        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 0      
Ending balance 0 0 0 0
Allocated to loans:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 64,805      
Ending balance 64,805      
Consumer        
Period end allowance for loan losses allocated to:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 328      
Ending balance 328 $ 277 $ 319 $ 453
Allocated to loans:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 63,605      
Ending balance $ 63,605