Fair Value of Assets and Liabilities - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Collateral Dependent Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	$ 12,487	$ 14,876
Foreclosed Assets Held-for-sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	3,303	290
Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	473	516
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral Dependent Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreclosed Assets Held-for-sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Collateral Dependent Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Foreclosed Assets Held-for-sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	12,487	14,876
Significant Unobservable Inputs (Level 3) | Foreclosed Assets Held-for-sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	3,303	290
Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	$ 473	$ 517