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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, 2017
Mar. 31, 2016
Securities available for sale, at fair value    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance $ 3,089 $ 3,077
Total gains:    
Included in other comprehensive income 4 8
Purchases, sales, issuances and settlements:    
Purchases 0 0
Ending balance 3,093 3,085
Change in unrealized gains (losses) relating to assets still held at the reporting date 4 8
State tax credits held for sale, at fair value    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 3,585 5,941
Total gains:    
Total gains: 40 76
Purchases, sales, issuances and settlements:    
Sales (2,167) (1,284)
Ending balance 1,458 4,733
Change in unrealized gains (losses) relating to assets still held at the reporting date $ (606) $ (305)