Fair Value Accounting and Measurement: Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Financial Assets and Liabilities Level 3	$ 0
Advances from FHLB at fair value
Fair Value Financial Assets and Liabilities Level 2	10,423	10,533
Total Fair Value Financial Assets and Liabilities	10,423	10,533
Junior subordinated debentures net of unamortized deferred issuance costs at fair value
Fair Value Financial Assets and Liabilities Level 3	70,553	49,988
Total Fair Value Financial Assets and Liabilities	70,553	49,988
Assets | Interest rate lock commitments
Fair Value Financial Assets and Liabilities Level 2	364	617
Total Fair Value Financial Assets and Liabilities	364	617
Assets | Interest rate swaps
Fair Value Financial Assets and Liabilities Level 2	7,734	5,667
Total Fair Value Financial Assets and Liabilities	7,734	5,667
Liabilities | Interest rate swaps
Fair Value Financial Assets and Liabilities Level 2	7,732	5,666
Total Fair Value Financial Assets and Liabilities	7,732	5,666
Liabilities | Interest rate sales forward commitments, net
Fair Value Financial Assets and Liabilities Level 2	414	617
Total Fair Value Financial Assets and Liabilities	414	617
Total liabilities and derivatives
Fair Value Financial Assets and Liabilities Level 2	18,569	16,816
Fair Value Financial Assets and Liabilities Level 3	70,553	49,988
Total Fair Value Financial Assets and Liabilities	89,122	66,804
Total trading securities | Assets
Fair Value Financial Assets and Liabilities Level 2		50,272
Fair Value Financial Assets and Liabilities Level 3		30,455
Total Fair Value Financial Assets and Liabilities		80,727
Total securities and derivatives
Fair Value Financial Assets and Liabilities Level 2	489,103	522,351
Fair Value Financial Assets and Liabilities Level 3	32,493	30,455
Total Fair Value Financial Assets and Liabilities	521,596	552,806
Available for Sale Securities | United States Government and agency obligations
Fair Value Financial Assets and Liabilities Level 2	228,024	338,971
Total Fair Value Financial Assets and Liabilities	228,024	338,971
Available for Sale Securities | Available for Sale Municipal Bonds
Fair Value Financial Assets and Liabilities Level 2	33,702	6,260
Total Fair Value Financial Assets and Liabilities	33,702	6,260
Available for Sale Securities | Corporate bonds
Fair Value Financial Assets and Liabilities Level 2	4,068	27,310
Total Fair Value Financial Assets and Liabilities	4,068	27,310
Available for Sale Securities | Mortgage Backed Securities Available for Sale
Fair Value Financial Assets and Liabilities Level 2	137,844
Total Fair Value Financial Assets and Liabilities	137,844
Available for Sale Securities | Asset-backed securities
Fair Value Financial Assets and Liabilities Level 2	32,492
Total Fair Value Financial Assets and Liabilities	32,492
Available for Sale Securities | Total available for sale securities
Fair Value Financial Assets and Liabilities Level 2	436,130	465,795
Total Fair Value Financial Assets and Liabilities	436,130	465,795
Available for Sale Securities | Mortgage Backed Securities Trading Securities
Fair Value Financial Assets and Liabilities Level 2		93,254
Total Fair Value Financial Assets and Liabilities		93,254
Trading Securities | United States Government and agency obligations
Fair Value Financial Assets and Liabilities Level 2	1,645	2,635
Total Fair Value Financial Assets and Liabilities	1,645	2,635
Trading Securities | Trading Securities Municipal Bonds
Fair Value Financial Assets and Liabilities Level 2	5,601	5,962
Total Fair Value Financial Assets and Liabilities	5,601	5,962
Trading Securities | TPS and TRUP CDOs
Fair Value Financial Assets and Liabilities Level 2	5,112	4,600
Fair Value Financial Assets and Liabilities Level 3	32,493	30,455
Total Fair Value Financial Assets and Liabilities	37,605	35,055
Trading Securities | Mortgage Backed Securities Trading Securities
Fair Value Financial Assets and Liabilities Level 2	32,063	36,673
Total Fair Value Financial Assets and Liabilities	32,063	36,673
Trading Securities | Equity securities and other
Fair Value Financial Assets and Liabilities Level 2	454	402
Total Fair Value Financial Assets and Liabilities	454	402
Trading Securities | Total trading securities
Fair Value Financial Assets and Liabilities Level 2	44,875
Fair Value Financial Assets and Liabilities Level 3	32,493
Total Fair Value Financial Assets and Liabilities	$ 77,368