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Fair Value of Assets and Liabilities (Details 1) - Trust preferred securities - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in the Level 3 fair value category    
Beginning balance $ 895 $ 825
Net realized/unrealized losses included in:    
Other comprehensive income (loss) 195 3
Purchases, issuance, and settlements   (1)
Ending balance $ 1,090 $ 827