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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
contract
Jun. 30, 2020
USD ($)
contract
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net deferred costs $ 25,200   $ 25,200   $ 22,600
Accrued interest receivable 15,700   15,700   25,800
Interest income from securities with no related allowance 400 $ 300 600 $ 400  
Value of loans deferred, not classified as TDRs $ 6,781   $ 6,781   74,062
Percentage on payment deferral 0.10%   0.10%    
Allowance for credit loss on TDRs $ 200 400 $ 200 $ 400  
Number of loans under trouble debt restructuring | contract     2 3  
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 6 21 11 46  
Maximum          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Value of loans deferred, not classified as TDRs   $ 1,100,000   $ 1,100,000  
Percentage on payment deferral   21.00%   21.00%  
Paycheck Protection Program | Portfolio Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net deferred fees $ 10,600   10,600   9,500
Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Remaining fair value adjustment for loans acquired     $ 24,400   $ 30,200
Percentage of fair value adjustment for loans acquired 3.00%   3.00%   2.90%