Loans (Summary of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary of loans under portfolio
Commercial loan	$ 4,250,117	$ 3,084,024
Consumer loan	3,021,030	2,604,206
Total loans	7,271,147	5,688,230
Commercial [Member]
Summary of loans under portfolio
Commercial loan	1,905,879	1,354,881
Real estate commercial [Member]
Summary of loans under portfolio
Commercial loan	2,112,162	1,557,648
Real estate construction [Member]
Summary of loans under portfolio
Commercial loan	210,231	152,745
Land development [Member]
Summary of loans under portfolio
Commercial loan	21,845	18,750
Real estate residential [Member]
Summary of loans under portfolio
Consumer loan	1,429,636	1,110,390
Consumer installment [Member]
Summary of loans under portfolio
Consumer loan	877,457	829,570
Home equity [Member]
Summary of loans under portfolio
Consumer loan	$ 713,937	$ 664,246