Proceeds From Sales and Calls of Investment Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Available-for-sale
Proceeds from sales and calls of investment securities		$ 58,623	$ 62,703
Gross realized gains	[1]	800	39
Gross realized losses	[1]	(739)	(35)
Held-to-maturity
Proceeds from calls of investment securities		11,155	460
Gross realized gains	[1]	47	1
Gross realized losses	[1]	$ 0	$ 0

[1] The gain or loss on the sale or call of each investment security is determined by the specific identification method.