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Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Other real estate owned   $ 0
Mortgage servicing rights $ 335 420
Nonrecurring [Member] | Nonresidential real estate loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Impaired loans   243
Nonrecurring [Member] | Land loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Other real estate owned   1
Nonrecurring [Member] | Other investments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments   3,427
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Impaired loans   0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Land loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Other real estate owned   0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Impaired loans   0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Land loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value, Other real estate owned   0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other investments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments   $ 3,427