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Investment Securities (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investment Securities [Abstract]    
Balance of credit-related OTTI, Beginning $ 3,133 $ 12,583
Decreases for previously recognized credit-related OTTI because there was an intent to sell 0 (10,029)
Additions for decreases in cash flows expected to be collected 0 602
Reduction for increases in cash flows expected to be collected (9) (23)
Balance of credit-related OTTI, Ending $ 3,124 $ 3,133