Allowance for Loan Losses Schedule of Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 49,620	$ 67,527	$ 59,496
Interest Income Recognized	1,170	719	398
Average Recorded Investment, Commercial	41,600	59,396	56,738
Interest Income Recognized, Commercial	945	532	276
Average Recorded Investment, Retail	8,020	8,131	2,758
Interest Income Recognized, Retail	225	187	122
Commercial real estate - owner occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	2,900
Interest Income Recognized	0	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,587	5,034	18,066
Interest Income Recognized	0	0	0
Commercial construction and land development
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,446	0	0
Interest Income Recognized	0	0	0
Commercial participations
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	5,302
Interest Income Recognized	0	0	0
Total loans with a specific valuation allowance
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,033	5,034	26,268
Interest Income Recognized	0	0	0
One-to-four family residential
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	7,150	7,353	2,758
Interest Income Recognized	215	183	122
Home equity lines of credit
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	719	609	0
Interest Income Recognized	10	4	0
Retail construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	151	169	0
Interest Income Recognized	0	0	0
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,128	3,577	4,738
Interest Income Recognized	30	152	128
Commercial real estate - owner occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	9,372	13,531	5,059
Interest Income Recognized	97	62	0
Commercial real estate - non-owner occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	19,624	27,913	6,695
Interest Income Recognized	780	282	144
Commercial real estate - multifamily
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,626	677	268
Interest Income Recognized	38	36	4
Commercial construction and land development
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,016	2,781	9,313
Interest Income Recognized	0	0	0
Commercial participations
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,801	5,883	4,397
Interest Income Recognized	0	0	0
Total loans without a specific valuation allowance
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	45,587	62,493	33,228
Interest Income Recognized	$ 1,170	$ 719	$ 398