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Fair Value of Assets and Liabilities - Assets Measured at Fair Value Nonrecurring (Details) - USD ($)
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Nonrecurring Basis            
Servicing rights originated $ 2,016,000   $ 2,218,000     $ 2,486,000
Allowance for credit loss 52,346,000 $ 54,768,000 63,967,000 $ 47,942,000 $ 44,897,000 $ 50,359,000
Valuation allowance on servicing rights 6,000   12,000      
Nonrecurring Basis | Level 2            
Nonrecurring Basis            
Loans held for sale 749,000   418,000      
Other real estate owned ("OREO") 0   0      
Servicing rights originated 0   0      
Allowance for credit loss 52,000   0      
Nonrecurring Basis | Level 2 | Collateral dependent loans            
Nonrecurring Basis            
Collateral dependent loans 0   0      
Nonrecurring Basis | Level 3            
Nonrecurring Basis            
Loans held for sale 0   0      
Other real estate owned ("OREO") 0   87,000      
Servicing rights originated 24,000   22,000      
Nonrecurring Basis | Level 3 | Collateral dependent loans            
Nonrecurring Basis            
Collateral dependent loans $ 1,021,000   $ 430,000