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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Available-for-sale
Proceeds from sales and calls of investment securities		$ 39,502	$ 166,577	$ 114,123	$ 200,277
Gross realized gains	[1]	516	160	598	341
Gross realized losses	[1]	(566)	(221)	(693)	(523)
Held-to-maturity
Proceeds from calls of investment securities		6,697	5,006	16,762	8,936
Gross realized gains	[1]	19	0	34	22
Gross realized losses	[1]	$ 0	$ 0	$ (63)	$ 0

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