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Loans and Allowance for Loan Losses - Summary of Allowance for Loan Losses by Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
[1]
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]            
Amount $ 61,535 [1] $ 59,152 $ 50,166 $ 47,448 $ 46,946 $ 57,548
Percentage of Allowance 100.00%   100.00%      
Allowance as a Percent of Loan Category 3.32%   3.37%      
Allowance as a Percent of Nonaccrual 199.93%   141.03%      
Recreation [Member]            
Financing Receivable Recorded Investment Past Due [Line Items]            
Amount $ 40,768   $ 32,435      
Percentage of Allowance 66.00%   64.00%      
Allowance as a Percent of Loan Category 3.48%   3.37%      
Allowance as a Percent of Nonaccrual 132.45%   91.18%      
Home Improvement [Member]            
Financing Receivable Recorded Investment Past Due [Line Items]            
Amount $ 10,208   $ 7,356      
Percentage of Allowance 17.00%   15.00%      
Allowance as a Percent of Loan Category 1.77%   1.68%      
Allowance as a Percent of Nonaccrual 33.17%   20.68%      
Commercial [Member]            
Financing Receivable Recorded Investment Past Due [Line Items]            
Amount $ 963   $ 1,141      
Percentage of Allowance 1.00%   2.00%      
Allowance as a Percent of Loan Category 1.03%   1.49%      
Allowance as a Percent of Nonaccrual 3.13%   3.21%      
Medallion [Member]            
Financing Receivable Recorded Investment Past Due [Line Items]            
Amount $ 9,596   $ 9,234      
Percentage of Allowance 16.00%   19.00%      
Allowance as a Percent of Loan Category 68.68%   65.74%      
Allowance as a Percent of Nonaccrual 31.18%   25.96%      
[1] As of September 30, 2022 and September 30, 2021, there were no allowance for loan losses and net charge-offs related to the strategic partnership loans.