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Revenue from Contracts with Customers (Details Textual) - ASC 606
 6 Months Ended
Jun. 30, 2021
USD ($)
Revenue From Contract With Customer [Line Items]  
Contingent debit card interchange fees $ 0
Contingent incentive fees 0
Contingent commission $ 0
Percentage of insurance agency commissions representing total revenue 2.50%
Percentage of retirement plan consulting fees representing total revenue 0.90%
Percentage of investment commissions representing total revenue 1.30%
Cetera  
Revenue From Contract With Customer [Line Items]  
Contingent investment commissions to be refunded $ 0