Noncovered Loans (Analysis of Nonaccrual Loans) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 41,589	$ 53,483
Unpaid Principal Balance Nonaccrual Loans	66,108	88,868
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	12,455	10,124
Unpaid Principal Balance Nonaccrual Loans	21,683	16,820
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	109	119
Unpaid Principal Balance Nonaccrual Loans	109	719
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,220	2,696
Unpaid Principal Balance Nonaccrual Loans	2,617	3,011
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,647	3,739
Unpaid Principal Balance Nonaccrual Loans	7,581	7,230
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	6,628	6,775
Unpaid Principal Balance Nonaccrual Loans	9,233	9,265
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	9,184	8,971
Unpaid Principal Balance Nonaccrual Loans	12,598	10,932
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	7,067
Unpaid Principal Balance Nonaccrual Loans	0	14,912
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	0
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,332	7,799
Unpaid Principal Balance Nonaccrual Loans	7,360	16,703
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,027	2,986
Unpaid Principal Balance Nonaccrual Loans	2,648	5,316
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,987	3,207
Unpaid Principal Balance Nonaccrual Loans	$ 2,279	$ 3,960