Noncovered Loans (Analysis of the Aged Loan Portfolio) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	$ 2,573,028	$ 2,476,797
30 - 59 Days Past Due	11,754	9,168
60 - 89 Days Past Due	3,544	2,350
Total Past Due	15,298	11,518
Nonaccrual Loans	32,886	37,395
Loans Receivable, Net	2,621,212	2,525,710
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,142,942	1,091,770
30 - 59 Days Past Due	3,739	4,259
60 - 89 Days Past Due	1,154	1,485
Total Past Due	4,893	5,744
Nonaccrual Loans	9,383	9,037
Loans Receivable, Net	1,157,218	1,106,551
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	43,918	44,817
30 - 59 Days Past Due	112	252
60 - 89 Days Past Due	164	12
Total Past Due	276	264
Nonaccrual Loans	121	262
Loans Receivable, Net	44,315	45,343
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	41,330	41,508
30 - 59 Days Past Due	849	193
60 - 89 Days Past Due	61	142
Total Past Due	910	335
Nonaccrual Loans	1,684	2,349
Loans Receivable, Net	43,924	44,192
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	43,785	42,818
30 - 59 Days Past Due	1,006	311
60 - 89 Days Past Due	0	122
Total Past Due	1,006	433
Nonaccrual Loans	3,347	4,076
Loans Receivable, Net	48,138	47,327
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	645,058	603,339
30 - 59 Days Past Due	2,434	2,726
60 - 89 Days Past Due	0	227
Total Past Due	2,434	2,953
Nonaccrual Loans	8,230	8,520
Loans Receivable, Net	655,722	614,812
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	389,803	387,525
30 - 59 Days Past Due	2,525	1,040
60 - 89 Days Past Due	1,621	0
Total Past Due	4,146	1,040
Nonaccrual Loans	5,825	6,608
Loans Receivable, Net	399,774	395,173
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	24,479	28,342
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Total Past Due	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	24,479	28,342
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	42,192	36,211
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Total Past Due	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	42,192	36,211
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	18,330	15,412
30 - 59 Days Past Due	204	0
60 - 89 Days Past Due	314	0
Total Past Due	518	0
Nonaccrual Loans	2,646	3,084
Loans Receivable, Net	21,494	18,496
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	30,768	29,848
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Total Past Due	0	0
Nonaccrual Loans	388	1,816
Loans Receivable, Net	31,156	31,664
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	150,423	155,207
30 - 59 Days Past Due	885	387
60 - 89 Days Past Due	230	362
Total Past Due	1,115	749
Nonaccrual Loans	1,262	1,643
Loans Receivable, Net	$ 152,800	$ 157,599