Proceeds From Sales and Calls of Investment Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Available-for-sale
Proceeds from sales and calls of investment securities		$ 59,974	$ 39,502	$ 148,458	$ 114,123
Gross realized gains	[1]	366	516	1,309	598
Gross realized losses	[1]	(960)	(566)	(1,960)	(693)
Held-to-maturity
Proceeds from calls of investment securities		340	6,697	21,965	16,762
Gross realized gains	[1]	0	19	91	34
Gross realized losses	[1]	$ 0	$ 0	$ (146)	$ (63)

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