Loans Receivable (Details 10) (Impaired Originated Loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	$ 30,272	$ 30,900	$ 29,568	$ 32,947
Commercial business [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	21,732	21,059	21,468	21,246
Real estate construction and land development [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	7,623	8,709	7,073	10,549
Consumer [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	79	118	90	148
Commercial and industrial [Member] | Commercial business [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	12,407	12,162	12,132	11,628
Owner-occupied commercial real estate [Member] | Commercial business [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	2,546	1,675	2,399	2,057
Non-owner occupied commercial real estate [Member] | Commercial business [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	6,779	7,222	6,937	7,561
One-to-four family residential [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	838	1,014	937	1,004
One-to-four family residential [Member] | Real estate construction and land development [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	5,038	4,080	4,125	4,620
Five or more family residential and commercial properties [Member] | Real estate construction and land development [Member]
Average recorded investment on impaired originated loans
Average Recorded Investment on Impaired Loans	$ 2,585	$ 4,629	$ 2,948	$ 5,929