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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan and lease losses			$ 268	$ 35,623
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	51,119	52,283	52,244	53,041
Charged-offs	(2,241)	(5,581)	(4,758)	(12,030)
Recoveries	820	1,744	3,212	2,935
Provision for loan and lease losses	2,000	3,750	1,000	8,250
Ending balance	51,698	52,196	51,698	52,196
Specific Reserve	839	4,265	839	4,265
General Allocation	50,859	47,931	50,859	47,931
Commercial Portfolio Segment [Member] | Secured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	26,871	25,542	27,270	24,745
Charged-offs	(856)	(2,028)	(1,844)	(4,382)
Recoveries	312	375	392	989
Provision for loan and lease losses	4,245	2,616	4,754	5,153
Ending balance	30,572	26,505	30,572	26,505
Specific Reserve	242	3,528	242	3,528
General Allocation	30,330	22,977	30,330	22,977
Commercial Portfolio Segment [Member] | Unsecured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	750	786	753	689
Charged-offs	(105)	(16)	(431)	(21)
Recoveries	40	3	73	47
Provision for loan and lease losses	136	(1)	426	57
Ending balance	821	772	821	772
Specific Reserve	51	136	51	136
General Allocation	770	636	770	636
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	657	689	694	654
Charged-offs	(28)	(334)	(144)	(449)
Recoveries	141	2	141	45
Provision for loan and lease losses	(98)	316	(19)	423
Ending balance	672	673	672	673
Specific Reserve	105	90	105	90
General Allocation	567	583	567	583
Real Estate Portfolio Segment [Member] | Commercial Land [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	433	693	460	488
Charged-offs	(11)	(77)	(11)	(382)
Recoveries	17	0	27	0
Provision for loan and lease losses	252	(346)	215	164
Ending balance	691	270	691	270
Specific Reserve	262	0	262	0
General Allocation	429	270	429	270
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,411	10,249	11,033	9,551
Charged-offs	(35)	(1,515)	(818)	(3,522)
Recoveries	27	336	106	354
Provision for loan and lease losses	292	(344)	(626)	2,343
Ending balance	9,695	8,726	9,695	8,726
Specific Reserve	76	49	76	49
General Allocation	9,619	8,677	9,619	8,677
Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,458	8,555	6,362	9,606
Charged-offs	(568)	(247)	(568)	(612)
Recoveries	40	486	44	538
Provision for loan and lease losses	(415)	243	(1,323)	(495)
Ending balance	4,515	9,037	4,515	9,037
Specific Reserve	30	0	30	0
General Allocation	4,485	9,037	4,485	9,037
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	382	223	316	665
Charged-offs	0	(93)	0	(93)
Recoveries	0	1	0	1
Provision for loan and lease losses	(141)	624	(75)	182
Ending balance	241	755	241	755
Specific Reserve	0	443	0	443
General Allocation	241	312	241	312
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	108	44	102	35
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	(28)	24	(22)	33
Ending balance	80	68	80	68
Specific Reserve	0	0	0	0
General Allocation	80	68	80	68
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	990	1,671	1,171	2,331
Charged-offs	0	(298)	(32)	(503)
Recoveries	35	376	2,174	423
Provision for loan and lease losses	(256)	(98)	(2,544)	(600)
Ending balance	769	1,651	769	1,651
Specific Reserve	73	0	73	0
General Allocation	696	1,651	696	1,651
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	538	1,002	635	864
Charged-offs	0	(599)	(101)	(599)
Recoveries	14	79	14	79
Provision for loan and lease losses	(348)	715	(344)	853
Ending balance	204	1,197	204	1,197
Specific Reserve	0	18	0	18
General Allocation	204	1,179	204	1,179
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,364	2,129	2,437	2,719
Charged-offs	(638)	(374)	(809)	(1,467)
Recoveries	194	86	241	459
Provision for loan and lease losses	535	208	586	338
Ending balance	2,455	2,049	2,455	2,049
Specific Reserve	0	1	0	1
General Allocation	2,455	2,048	2,455	2,048
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,157	700	1,011	694
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	(2,174)	(207)	(28)	(201)
Ending balance	983	493	983	493
Specific Reserve	0	0	0	0
General Allocation	$ 983	$ 493	$ 983	$ 493