Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan and lease losses	$ (20)	$ 20,185
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,244	53,041
Charged-offs	(2,517)	(6,450)
Recoveries	2,392	1,192
Provision for loan and lease losses	(1,000)	4,500
Ending balance	51,119	52,283
Specific Reserve	385	1,785
General Allocation	50,734	50,498
Commercial Portfolio Segment [Member] | Secured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	27,270	24,745
Charged-offs	(988)	(2,354)
Recoveries	79	614
Provision for loan and lease losses	510	2,537
Ending balance	26,871	25,542
Specific Reserve	67	451
General Allocation	26,804	25,091
Commercial Portfolio Segment [Member] | Unsecured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	753	689
Charged-offs	(326)	(5)
Recoveries	34	44
Provision for loan and lease losses	289	58
Ending balance	750	786
Specific Reserve	84	141
General Allocation	666	645
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	694	654
Charged-offs	(116)	(116)
Recoveries	0	43
Provision for loan and lease losses	79	108
Ending balance	657	689
Specific Reserve	108	72
General Allocation	549	617
Real Estate Portfolio Segment [Member] | Commercial Land [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	460	488
Charged-offs	0	(305)
Recoveries	10	0
Provision for loan and lease losses	(37)	510
Ending balance	433	693
Specific Reserve	0	0
General Allocation	433	693
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,033	9,551
Charged-offs	(783)	(2,008)
Recoveries	79	18
Provision for loan and lease losses	(918)	2,688
Ending balance	9,411	10,249
Specific Reserve	18	1,087
General Allocation	9,393	9,162
Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,362	9,606
Charged-offs	0	(365)
Recoveries	4	53
Provision for loan and lease losses	(908)	(739)
Ending balance	5,458	8,555
Specific Reserve	34	16
General Allocation	5,424	8,539
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	316	665
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	66	(442)
Ending balance	382	223
Specific Reserve	0	0
General Allocation	382	223
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	102	35
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	6	9
Ending balance	108	44
Specific Reserve	0	0
General Allocation	108	44
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,171	2,331
Charged-offs	(32)	(204)
Recoveries	2,139	47
Provision for loan and lease losses	(2,288)	(503)
Ending balance	990	1,671
Specific Reserve	74	0
General Allocation	916	1,671
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	635	864
Charged-offs	(101)	0
Recoveries	0	0
Provision for loan and lease losses	4	138
Ending balance	538	1,002
Specific Reserve	0	18
General Allocation	538	984
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,437	2,719
Charged-offs	(171)	(1,093)
Recoveries	47	373
Provision for loan and lease losses	51	130
Ending balance	2,364	2,129
Specific Reserve	0	0
General Allocation	2,364	2,129
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,011	694
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	2,146	6
Ending balance	3,157	700
Specific Reserve	0	0
General Allocation	$ 3,157	$ 700