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Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Level 3 - Recurring basis - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Securities available for sale, at fair value        
Level 3 Financial Instruments Measured at Fair Value        
Beginning balance $ 0 $ 0 $ 0 $ 3,089
Total gains:        
Included in other comprehensive income 0 0 0 4
Purchases, sales, issuances and settlements:        
Purchases 0 0 0 0
Transfer in and/or out of Level 3 0 0 0 (3,093)
Ending balance 0 0 0 0
Change in unrealized gains relating to assets still held at the reporting date 0 0 0 0
State tax credits held for sale, at fair value        
Level 3 Financial Instruments Measured at Fair Value        
Beginning balance 299 1,274 400 3,585
Total gains:        
Total gains: 7 0 13 49
Purchases, sales, issuances and settlements:        
Sales (135) 0 (242) (2,360)
Ending balance 171 1,274 171 1,274
Change in unrealized gains relating to assets still held at the reporting date $ (34) $ 0 $ (60) $ (655)