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Loans Held for Sale and Loan Servicing Narrative Data (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]    
Unpaid principal balance of loans serviced for others $ 629,500,000 $ 579,900,000
Loan servicing rights, unamortized balance 2,300,000 1,700,000
Loan servicing rights, valuation allowance 0 0
Credit Enhancement Obligation    
Servicing Assets at Fair Value [Line Items]    
Contractual risk sharing commitments, maximum liability $ 747,000 $ 705,000