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Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 313,376 $ 360,520    
Mortgage servicing rights, impairment reserve 358 0    
Allowance for loan losses, other real estate owned 45 0 $ 0 $ 53
Allowance for impaired loans 304 1,916    
Mortgage servicing rights 1,985 2,089    
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 0 0    
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 1,985 2,089    
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 0 0    
Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 1,985 2,089    
U.S. government-sponsored agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 22,730 7,398    
Mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 243,406 326,617    
State and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 39,474 26,505    
Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 7,766      
Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 2,640 1,767    
Fair Value, Measurements, Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Interest rate swap agreements 0 0    
Derivative liabilities 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 313,376 360,520    
Interest rate swap agreements 2,640 1,767    
Derivative liabilities 8,882 1,644    
Assets measured at fair value 316,016 362,287    
Fair Value, Measurements, Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Interest rate swap agreements 0 0    
Derivative liabilities 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Recurring | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 313,376 360,520    
Derivative liabilities 8,882 1,644    
Assets measured at fair value 316,016 362,287    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements   0    
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements   562    
Derivative liabilities 6,242 439    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements   0    
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Interest Rate Swap | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements   562    
Derivative liabilities 6,242 439    
Fair Value, Measurements, Recurring | Customer Loan Interest Swap        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 2,640 1,205    
Derivative liabilities 2,640 1,205    
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 0 0    
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 2,640 1,205    
Derivative liabilities 2,640 1,205    
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 0 0    
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 22,730 7,398    
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 22,730 7,398    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 243,406 326,617    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 243,406 326,617    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 39,474 26,505    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | State and political subdivisions | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 39,474 26,505    
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0      
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 7,766      
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0      
Fair Value, Measurements, Recurring | Asset-backed securities | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 7,766      
Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned 908 279    
Impaired loans 794 6,579    
Assets measured at fair value 3,687 8,947    
Fair Value, Measurements, Nonrecurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 0 0    
Other real estate owned 0 0    
Impaired loans 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Nonrecurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 1,985 2,089    
Other real estate owned 908 279    
Impaired loans 794 6,579    
Assets measured at fair value 3,687 8,947    
Fair Value, Measurements, Nonrecurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights 0 0    
Other real estate owned 0 0    
Impaired loans 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Nonrecurring | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights $ 1,985 $ 2,089