Proceeds From Sales and Calls of Investment Securities and Associates Gains or Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Available-for-sale
Proceeds from sales and calls of investment securities	$ 62,703		$ 11,927
Gross realized gains	39	[1]	21	[1]
Gross realized losses	(35)	[1]	(94)	[1]
Held-to-maturity
Proceeds from calls of investment securities	460		3,930
Gross realized gains	1	[1]	22	[1]
Gross realized losses	$ 0	[1]	$ 0	[1]

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