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Securities Available for Sale and Held to Maturity - Gains and Losses as a Result of Calls and Disposition of Securities (Details) - Available for Sale [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gains (losses) on Investments [Abstract]    
Proceeds from calls and sales of securities $ 24,693 $ 0
Gross realized gains 32 0
Gross realized (losses) $ (342) $ 0