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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
USD ($)
contract
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net deferred costs $ 32,100   $ 32,100   $ 22,600  
Accrued interest receivable 15,200   15,200   25,800  
Interest income from securities with no related allowance 300 $ 100 900 $ 500    
Value of loans deferred, not classified as TDRs $ 2,154   $ 2,154   74,062  
Percentage on payment deferral 0.04%   0.04%      
Allowance for credit loss on TDRs $ 200 200 $ 200 $ 200    
Number of loans under trouble debt restructuring | contract     2 4    
Amount of loans in default     $ 100 $ 1,400    
Interest income related to impaired loans with impairment measured on present value of expected future cash flows $ 9 $ 19 20 $ 65    
Maximum            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Value of loans deferred, not classified as TDRs           $ 1,100,000
Percentage on payment deferral           21.00%
Loans            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Remaining fair value adjustment for loans acquired     $ 26,600   $ 30,200  
Percentage of fair value adjustment for loans acquired 2.30%   2.30%   2.90%  
Portfolio Loans | Paycheck Protection Program            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net deferred fees $ 5,400   $ 5,400   $ 9,500