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Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Valuation allowance $ 9,130,000 $ 9,104,000 $ 8,778,000 $ 9,326,000 $ 9,326,000
Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Valuation allowance 0        
Write-offs 0 0      
Loans receivable 928,807,000 899,214,000      
Fair Value | Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Valuation allowance   27,000      
Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans receivable $ 934,250,000 909,591,000      
Impaired loans | Fair Value | Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans receivable   134,000      
Impaired loans | Carrying Value | Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans receivable   $ 161,000