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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Securities available for sale, at fair value        
Level 3 Financial Instruments Measured at Fair Value        
Beginning balance $ 0 $ 3,093 $ 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 (3,093) 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 350 1,458 400 3,585
Total gains:        
Total gains: 3 9 6 49
Purchases, sales, issuances and settlements:        
Sales (54) (193) (107) (2,360)
Ending balance 299 1,274 299 1,274
Change in unrealized gains relating to assets still held at the reporting date $ (13) $ (49) $ (26) $ (655)