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Allowance for Credit Losses on Loans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for Loan and Lease Losses Write-offs, Net         $ (3,200)    
Financing Receivable Allowance for Credit Losses Recovery Details         963    
Provision for credit losses $ 1,558 $ 466 $ 1,367 $ 920 35,433 $ 4,311 $ 5,129
Commercial business              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Provision for credit losses         30,831 2,257 2,204
Commercial business | Commercial and industrial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable Allowance For Credit Losses WriteOff Details         1,700    
Financing Receivable, Allowance for Credit Loss, Writeoff Net         447    
Provision for credit losses         21,722 2,922 1,782
Real estate construction and land development              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Provision for credit losses         3,502 362 131
Real estate construction and land development | Commercial and multifamily              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Allowance for Credit Loss, Writeoff Net         417    
Provision for credit losses         2,713 651 (236)
Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for Loan and Lease Losses Write-offs, Net         (884)    
Provision for credit losses         $ 2,441 $ 1,831 $ 2,147