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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
Mar. 31, 2018
Mar. 31, 2017
Securities available for sale, at fair value    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance $ 0 $ 3,089
Total gains:    
Included in other comprehensive income 0 4
Purchases, sales, issuances and settlements:    
Purchases 0 0
Transfer in and/or out of Level 3 0 0
Ending balance 0 3,093
Change in unrealized gains relating to assets still held at the reporting date 0 4
State tax credits held for sale, at fair value    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 400 3,585
Total gains:    
Total gains: 3 40
Purchases, sales, issuances and settlements:    
Sales (53) (2,167)
Ending balance 350 1,458
Change in unrealized gains relating to assets still held at the reporting date $ (13) $ (606)