Business Combinations - Fair Value of Acquired loans (Details) (USD $) In Thousands, unless otherwise specified	Oct. 02, 2014
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	$ 378,813
Business Combination, Assets Arising from Contingencies, Amount Recognized	365,363
Single Family Residential Real Estate [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	50,768
Business Combination, Assets Arising from Contingencies, Amount Recognized	49,184
Commercial Real Estate [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	229,859
Business Combination, Assets Arising from Contingencies, Amount Recognized	224,837
Construction Development Land [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	30,994
Business Combination, Assets Arising from Contingencies, Amount Recognized	27,578
Commercial loans [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	52,458
Business Combination, Assets Arising from Contingencies, Amount Recognized	51,479
Consumer And Other Loans [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	3,647
Business Combination, Assets Arising from Contingencies, Amount Recognized	3,568
Purchased Credit Impaired [Member]
Business Combination, Assets Arising from Contingencies, Amount Recognized, Other than at Fair Value	11,087
Business Combination, Assets Arising from Contingencies, Amount Recognized	$ 8,717