Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Recorded Investment [Line Items]
Loans, net	$ 2,864,803	$ 2,827,259
Loans held for sale	2,563	2,148
Noncovered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: Net unearned income	(7,767)	(16,217)
Total noncovered loans, net of unearned income	2,525,710	2,348,371
Less: Allowance for loan and lease losses	(52,244)	(53,041)	(60,993)	(53,478)
Loans, net	2,473,466	2,295,330
Loans held for sale	2,563	2,148
Noncovered Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Business	1,155,158	1,031,721
Noncovered Loans [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Real Estate	1,105,123	1,062,656
Noncovered Loans [Member] | Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Real Estate Construction	115,703	86,976
Noncovered Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer	157,493	183,235
Less: Allowance for loan and lease losses	(2,437)	(2,719)	(2,120)	(1,282)
Noncovered Loans [Member] | One-to-Four Family Residential [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate	43,922	64,491
Less: Allowance for loan and lease losses	(694)	(654)	(1,100)	(1,072)
Noncovered Loans [Member] | One-to-Four Family Residential [Member] | Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate Construction	50,602	50,208
Noncovered Loans [Member] | Commercial and Multifamily Residential [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate	1,061,201	998,165
Noncovered Loans [Member] | Commercial and Multifamily Residential [Member] | Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate Construction	$ 65,101	$ 36,768