Fair Value Measurement: Schedule of Fair Value of Financial Assets and Liabilities (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Carrying Amount
Financial assets -- Cash and cash equivalents	$ 624,800,000	$ 380,249,000
Financial assets -- Held to maturity securities	920,000	1,865,000
Financial assets -- Mortgage loans held for sale	28,176,000	28,920,000
Financial assets -- Loans, net of allowance for loan losses	2,308,676,000	2,124,161,000
Financial assets -- Accrued interest receivable	13,944,000	13,848,000
Financial assets -- Investment in FHLB stock	11,077,000	12,088,000
Financial liabilities -- Deposits	3,392,957,000	2,963,539,000
Financial liabilities -- FHLB advances	146,673,000	184,437,000
Financial liabilities -- Short term borrowings	206,532,000	217,397,000
Financial liabilities -- Structured repurchase agreements	53,065,000	53,090,000
Financial liabilities -- Subordinated debentures	30,929,000	30,929,000
Financial liabilities -- Accrued interest payable	2,004,000	2,277,000
Unrecognized financial instruments (net of contractual value) -- Letters of credit	55,000	84,000
Portion at Fair Value
Financial assets -- Cash and cash equivalents	624,800,000	380,249,000
Financial assets -- Held to maturity securities	1,093,000	2,101,000
Financial assets -- Mortgage loans held for sale	28,176,000	28,920,000
Financial assets -- Loans, net of allowance for loan losses	2,314,710,000	2,124,032,000
Financial assets -- Accrued interest receivable	13,944,000	13,848,000
Financial assets -- Investment in FHLB stock	11,077,000	12,088,000
Financial liabilities -- Deposits	3,396,507,000	2,966,874,000
Financial liabilities -- FHLB advances	150,271,000	189,793,000
Financial liabilities -- Short term borrowings	206,532,000	217,397,000
Financial liabilities -- Structured repurchase agreements	59,778,000	60,471,000
Financial liabilities -- Subordinated debentures	30,929,000	30,929,000
Financial liabilities -- Accrued interest payable	2,004,000	2,277,000
Unrecognized financial instruments (net of contractual value) -- Letters of credit	55,000	84,000
Heirarchy Level
Financial assets -- Cash and cash equivalents	1
Financial assets -- Held to maturity securities	2
Financial assets -- Mortgage loans held for sale	2
Financial assets -- Loans, net of allowance for loan losses	3
Financial assets -- Accrued interest receivable	3
Financial assets -- Investment in FHLB stock	3
Financial liabilities -- Deposits	3
Financial liabilities -- FHLB advances	3
Financial liabilities -- Short term borrowings	3
Financial liabilities -- Structured repurchase agreements	3
Financial liabilities -- Subordinated debentures	3
Financial liabilities -- Accrued interest payable	3
Unrecognized financial instruments (net of contractual value) -- Commitments to originate loans	3
Unrecognized financial instruments (net of contractual value) -- Letters of credit	3
Unrecognized financial instruments (net of contractual value) -- Lines of credit	$ 3