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Allowance for Credit Losses (TDRs Narrative) (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
contracts
Sep. 30, 2019
USD ($)
contracts
Sep. 30, 2020
USD ($)
contracts
Sep. 30, 2019
USD ($)
contracts
Sep. 30, 2020
USD ($)
contracts
Sep. 30, 2019
USD ($)
contracts
Financing Receivable, Allowance for Credit Loss [Line Items]            
TDRs, count | contracts 36 68 103 127 152 157
Foreclosed residential real estate properties $ 1,800   $ 1,800   $ 1,800  
TDRs, balance $ 7,596 $ 13,597 $ 40,410 $ 46,804 47,173 $ 51,219
Weighted average extension term 26 months 13 months 14 months 14 months    
Weighted average decrease in stated interest rate 1.16% 1.61% 1.43% 2.05%    
Interest-only payment terms 5 months 9 months 13 months 5 months    
Loan forgiveness $ 0 $ 0 $ 453      
Financing Receivable            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans modified in TDRs 78,500   $ 78,500   78,500  
TDRs, count | contracts     291      
Allowance for loan losses related to impaired loans 2,800   $ 2,800   2,800  
Residential Real Estate | Financing Receivable            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Recorded investment, foreclosure proceedings in process $ 17,700 $ 12,600 $ 17,700 $ 12,600 $ 17,700 $ 12,600