Disclosures About Fair Value of Financial Instruments - Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Assets Measured on a Nonrecurring Basis:
Impaired loans	$ 56,151		$ 44,993
Other real estate owned	9,230		12,122
Level 3 [Member]
Assets Measured on a Nonrecurring Basis:
Other real estate owned	9,230		$ 12,122
Nonrecurring [Member]
Assets Measured on a Nonrecurring Basis:
Impaired loans	38,482	$ 2,467
Impaired loans, adjustment	3,704	323
Nonrecurring [Member] | Level 3 [Member]
Assets Measured on a Nonrecurring Basis:
Impaired loans	$ 38,482	$ 2,467