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Loans and Allowance for Loan Losses ("ALLL") - Allowance for loan losses - Previous GAAP (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 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 $ 74,551 $ 75,295
Allocated to loans:      
Individually evaluated for impairment 56,927    
Collectively evaluated for impairment 4,212,693    
Ending balance 4,269,620    
Commercial      
Period end allowance for loan losses allocated to:      
Individually evaluated for impairment 333    
Collectively evaluated for impairment 20,019    
Ending balance 20,352 23,464 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 20,292 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 20,609 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 3,837 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 6,056 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
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 $ 293 $ 453
Allocated to loans:      
Individually evaluated for impairment 0    
Collectively evaluated for impairment 63,605    
Ending balance $ 63,605