Loans (Summary of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of loans under portfolio
Commercial loan	$ 2,518,826	$ 2,264,820
Consumer loan	2,128,795	1,902,915
Total loans	4,647,621	4,167,735
Commercial [Member]
Summary of loans under portfolio
Commercial loan	1,176,307	1,002,722
Real estate commercial [Member]
Summary of loans under portfolio
Commercial loan	1,232,658	1,161,861
Real estate construction [Member]
Summary of loans under portfolio
Commercial loan	89,795	62,689
Land development [Member]
Summary of loans under portfolio
Commercial loan	20,066	37,548
Real estate residential [Member]
Summary of loans under portfolio
Consumer loan	960,423	883,835
Consumer installment [Member]
Summary of loans under portfolio
Consumer loan	644,769	546,036
Home equity [Member]
Summary of loans under portfolio
Consumer loan	$ 523,603	$ 473,044