Proceeds From Sales and Calls of Investment Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Available-for-sale
Proceeds from sales and calls of investment securities		$ 11,918	$ 21,773	$ 74,621	$ 33,700
Gross realized gains	[1]	43	160	82	181
Gross realized losses	[1]	(92)	(208)	(127)	(302)
Held-to-maturity
Proceeds from calls of investment securities		9,605	0	10,065	3,930
Gross realized gains	[1]	14	0	15	22
Gross realized losses	[1]	$ (63)	$ 0	$ (63)	$ 0

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