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Allowance for Credit Losses on Loans - Recorded Investment Disaggregated on Basis of Impairment (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
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance $ 36,171       $ 70,185 $ 36,171 $ 35,042 $ 32,086
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,143         2,143    
Financing Receivable, Individually Evaluated for Impairment 57,481         57,481    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 3,692,288         3,692,288    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 18,110         18,110    
Allowance for Loan and Lease Losses, Write-offs         5,622 4,989 3,605  
Recoveries         2,381 1,807 1,432  
Provision for credit losses 1,558 $ 466 $ 1,367 $ 920 35,433 4,311 5,129  
Commercial Portfolio Segment [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 23,933       49,608 23,933 23,711 21,999
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,944         1,944    
Financing Receivable, Individually Evaluated for Impairment 56,468         56,468    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 2,876,992         2,876,992    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 12,773         12,773    
Allowance for Loan and Lease Losses, Write-offs         3,751 2,692 1,400  
Recoveries         1,530 657 908  
Provision for credit losses         30,831 2,257 2,204  
Commercial Portfolio Segment [Member] | Commercial and industrial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 11,739       30,010 11,739 11,343 9,910
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,372         1,372    
Financing Receivable, Individually Evaluated for Impairment 43,808         43,808    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 806,044         806,044    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 2,368         2,368    
Allowance for Loan and Lease Losses, Write-offs           2,692 1,250  
Recoveries           166 901  
Provision for credit losses         21,722 2,922 1,782  
Commercial Portfolio Segment [Member] | Owner-occupied CRE                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 4,512       9,486 4,512 4,898 3,992
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 426         426    
Financing Receivable, Individually Evaluated for Impairment 6,336         6,336    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 793,984         793,984    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 4,914         4,914    
Allowance for Loan and Lease Losses, Write-offs           0 1  
Recoveries           50 7  
Provision for credit losses         4,640 (436) 900  
Commercial Portfolio Segment [Member] | Non-owner occupied CRE                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 7,682       10,112 7,682 7,470 8,097
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 146         146    
Financing Receivable, Individually Evaluated for Impairment 6,324         6,324    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 1,276,964         1,276,964    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 5,491         5,491    
Allowance for Loan and Lease Losses, Write-offs           0 149  
Recoveries           441 0  
Provision for credit losses         4,469 (229) (478)  
Residential real estate                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 1,458       1,591 1,458 1,203 1,056
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 56         56    
Financing Receivable, Individually Evaluated for Impairment 215         215    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 127,870         127,870    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 3,575         3,575    
Allowance for Loan and Lease Losses, Write-offs           60 45  
Recoveries           0 0  
Provision for credit losses         (1,341) 315 192  
Real Estate Construction and Land Development                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 3,060       13,092 3,060 2,194 2,052
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0         0    
Financing Receivable, Individually Evaluated for Impairment 237         237    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 274,409         274,409    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 0         0    
Allowance for Loan and Lease Losses, Write-offs         417 133 0  
Recoveries         278 637 11  
Provision for credit losses         3,502 362 131  
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 1,455       1,951 1,455 1,240 862
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0         0    
Financing Receivable, Individually Evaluated for Impairment 237         237    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 104,059         104,059    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 0         0    
Allowance for Loan and Lease Losses, Write-offs           133 0  
Recoveries           637 11  
Provision for credit losses         789 (289) 367  
Real Estate Construction and Land Development | Commercial and multifamily                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 1,605       11,141 1,605 954 1,190
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0         0    
Financing Receivable, Individually Evaluated for Impairment 0         0    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 170,350         170,350    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 0         0    
Allowance for Loan and Lease Losses, Write-offs           0 0  
Recoveries           0 0  
Provision for credit losses         2,713 651 (236)  
Consumer                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 6,821       5,894 6,821 6,581 6,081
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 143         143    
Financing Receivable, Individually Evaluated for Impairment 561         561    
Schedule of loan receivables on the basis of impairment method                
Loans Collectively Evaluated for Impairment 413,017         413,017    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 1,762         1,762    
Allowance for Loan and Lease Losses, Write-offs           2,104 2,160  
Recoveries           513 513  
Provision for credit losses         2,441 1,831 2,147  
Unallocated                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and Leases Receivable, Allowance 899       0 899 1,353 $ 898
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment            
Schedule of loan receivables on the basis of impairment method                
Allowance for Loan and Lease Losses, Write-offs         0 0 0  
Recoveries         0 0 0  
Provision for credit losses         $ 0 $ (454) $ 455