XML 53 R42.htm IDEA: XBRL DOCUMENT v3.21.2
Allowance for Credit Losses and Credit Quality of Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Allowance for Credit Losses [Abstract]            
Allowance for credit losses $ 93,000 $ 110,000 $ 98,500 $ 114,500 $ 113,500 $ 75,999
Percentage of allowance of credit losses 1.23% 1.47%        
Retained earnings $ 831,017 $ 749,056        
Loans purchased with credit deterioration 0 0        
Allowance for credit losses on loans purchased 4,600 3,600        
Accrued Interest Receivable [Member]            
Allowance for Credit Losses [Abstract]            
Allowance for credit losses 0 600        
AIR on loans $ 20,400 23,700        
Write-off of uncollectible interest period 120 days          
COVID-19 [Member]            
Allowance for Credit Losses [Abstract]            
Loans in modification programs related to COVID-19 $ 2,000          
ASU 2016-13 [Member] | Loans [Member]            
Allowance for Credit Losses [Abstract]            
Allowance for credit losses           3,000
Retained earnings           (2,300)
Deferred tax asset           700
Consumer Loans [Member]            
Allowance for Credit Losses [Abstract]            
Allowance for credit losses 41,071 37,803 34,881 38,562 40,094 32,122
Amount of loans purchased 60,300 $ 51,900        
Discount on loans purchased   1.00%        
Residential [Member]            
Allowance for Credit Losses [Abstract]            
Allowance for credit losses 18,751 $ 21,255 $ 19,428 $ 24,192 $ 23,020 $ 16,721
Amount of loans purchased $ 52,400          
Premium on loans purchased 2.00%