Fair Value Accounting and Measurement: Schedule of Estimated Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets | Cash and due from banks
Financial Instruments Carrying Value	$ 189,176	$ 132,436
Financial Instruments Estimated Fair Value	189,176	132,436
Assets | Securities -- trading
Financial Instruments Carrying Value	77,368	80,727
Financial Instruments Estimated Fair Value	77,368	80,727
Assets | Securities -- available for sale
Financial Instruments Carrying Value	486,130	465,795
Financial Instruments Estimated Fair Value	486,130	465,795
Assets | Securities -- held to maturity
Financial Instruments Carrying Value	83,312	75,438
Financial Instruments Estimated Fair Value	89,153	80,107
Assets | Loans receivable held for sale
Financial Instruments Carrying Value	6,752	3,007
Financial Instruments Estimated Fair Value	6,821	3,069
Assets | Loans receivable
Financial Instruments Carrying Value	3,205,505	3,293,331
Financial Instruments Estimated Fair Value	3,132,055	3,224,112
Assets | FHLB stock
Financial Instruments Carrying Value	37,371	37,371
Financial Instruments Estimated Fair Value	37,371	37,371
Assets | Bank-owned life insurance
Financial Instruments Carrying Value	59,800	58,563
Financial Instruments Estimated Fair Value	59,800	58,563
Assets | Mortgage servicing rights
Financial Instruments Carrying Value	6,202	5,584
Financial Instruments Estimated Fair Value	6,202	5,584
Assets | Derivatives
Financial Instruments Carrying Value	8,098	6,284
Financial Instruments Estimated Fair Value	8,098	6,284
Liabilities | Derivatives
Financial Instruments Carrying Value	8,146	6,283
Financial Instruments Estimated Fair Value	8,146	6,283
Liabilities | Demand, NOW and money market accounts
Financial Instruments Carrying Value	1,589,716	1,555,561
Financial Instruments Estimated Fair Value	1,522,791	1,487,080
Liabilities | Regular savings
Financial Instruments Carrying Value	664,736	669,596
Financial Instruments Estimated Fair Value	630,020	630,450
Liabilities | Certificates of deposit
Financial Instruments Carrying Value	1,171,297	1,250,497
Financial Instruments Estimated Fair Value	1,176,892	1,258,431
Liabilities | FHLB advances at fair value
Financial Instruments Carrying Value	10,423	10,533
Financial Instruments Estimated Fair Value	10,423	10,533
Liabilities | Junior subordinated debentures at fair value
Financial Instruments Carrying Value	70,553	49,988
Financial Instruments Estimated Fair Value	70,553	49,988
Liabilities | Other borrowings
Financial Instruments Carrying Value	90,030	152,128
Financial Instruments Estimated Fair Value	90,030	152,128
Off-balance sheet financial instruments | Commitments to originate loans
Financial Instruments Carrying Value	364	617
Financial Instruments Estimated Fair Value	364	617
Off-balance sheet financial instruments | Commitments to sell loans
Financial Instruments Carrying Value	(414)	(617)
Financial Instruments Estimated Fair Value	$ (414)	$ (617)