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Loans and Allowance for Credit Losses on Loans - Troubled Debt Restructuring Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Aug. 12, 2021
USD ($)
borrowingRelationship
loan
Jun. 30, 2021
USD ($)
borrowingRelationship
loan
Jun. 30, 2020
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans removed from TDR designation   0 0
Financing receivable, loan modifications under CARES Act, payment relief, number of borrowing relationships | borrowingRelationship   7  
Financing receivable, loan modifications under CARES Act, payment relief   12  
Financing receivable, modified under CARES Act, payment relief | $   $ 49.8  
Financing receivable, weighted average loan-to-value ratio, modified under CARES Act, remaining payment relief   41.00%  
Subsequent event      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing receivable, loan modifications under CARES Act during period, borrowing relationships, subsequently resumed payments | borrowingRelationship 1    
Financing receivable, loan modifications under CARES Act during period, subsequently resumed payments 3    
Financing receivable, modified under CARES Act during period, subsequently resumed payments | $ $ 6.4