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Securities - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
numberOfSecurities
Jun. 30, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Gain (loss) on sale of held to maturity debt $ 100    
Pledged securities as collateral for public fund deposits and borrowings   $ 226,200  
Pledged securities, market value   $ 226,200  
Number of debt securities with unrealized losses | numberOfSecurities   80  
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis   2.00%  
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio   0.40%  
Number of debt securities in continuous loss position for over 12 months | numberOfSecurities   8  
Debt securities in a continuous loss position for over 12 months, amortized cost basis   $ 2,000  
Debt securities in a continuous loss position for over 12 months, unrealized loss   $ 400  
Number of securities with other than temporary impairment loss | numberOfSecurities   1  
Other Than Temporary Impairment Charge on Securities   $ 50 $ 0
Other-than-temporary impairment credit losses on securities not previously OTTI   50 0
Increases for additional credit losses on securities previously determined to be OTTI   0 $ 0
Original book balance   $ 100  
U.S. Government Agencies      
Debt Securities, Available-for-sale [Line Items]      
Debt hold to maturity, sold 18,200    
Mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Debt hold to maturity, sold 13,500    
Municipal bonds      
Debt Securities, Available-for-sale [Line Items]      
Debt hold to maturity, sold $ 200