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Allowance for Credit Losses on Loans - Recorded Investment Disaggregated on Basis of Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule of loan receivables on the basis of impairment method        
Allowance for Loan and Lease Losses, Write-offs     $ 1,267 $ 4,694
Allowance for Loan and Lease Loss, Recovery of Bad Debts     1,207 1,816
Provision for credit losses $ (2,852) $ 2,320 (21,808) 38,225
Commercial Portfolio Segment        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (1,246) 4,718 (14,513) 36,068
Commercial Portfolio Segment | Commercial and Industrial        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses 1,531 1,815 (11,317) 22,982
Commercial Portfolio Segment | Owner Occupied Commercial Real Estate        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (1,644) 3,027 (2,581) 8,187
Commercial Portfolio Segment | Non Owner Occupied Commercial Real Estate        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (1,133) (124) (615) 4,899
Residential Portfolio Segment        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (67) (398) (505) (1,107)
Real Estate Construction and Land Development        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (1,394) 28 (4,034) (598)
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses 136 (42) (199) (380)
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses (1,530) 70 (3,835) (218)
Consumer Portfolio Segment        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses $ (145) $ (2,028) $ (2,756) 3,862
Unallocated        
Schedule of loan receivables on the basis of impairment method        
Provision for credit losses       $ 0