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Note 6 - Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Equity Securities [Member]    
Balance $ 1,472 $ 886
Total realized and unrealized gains included in noninterest income 8 114
Net purchases, sales, calls, and maturities 0 0
Net transfers into Level 3 0 0
Balance, September 30 1,480 1,000
Available-for-sale Securities [Member]    
Balance 12,367 8,498
Total realized and unrealized gains included in noninterest income 452 350
Net purchases, sales, calls, and maturities (1,506) 1,429
Net transfers into Level 3 0 0
Balance, September 30 $ 11,313 $ 10,277