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Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]
Carrying value of the loans pledged	$ 110,000		$ 0
Prepayment of FHLB advances		$ 50,000
Weighted average interest rate		3.17%
Maturity (in years)		3 years
Prepayment penalty	2,900
Short term advances outstanding	$ 110,000		$ 0
Weighted average interest rate on short term advances	0.00%		0.00%
Collateral used to secure confirming letters of credit			$ 26,700
Weighted Rate
Federal Home Loan Bank, Advances, Maturities Summary, One to Five Years	$ 0		$ 0
Federal Home Loan Bank Advances, Maturities Summary, Average Interest Rate of Amounts Due in One to Five Years of Balance Sheet Date	0.00%		0.00%
Federal Home Loan Bank, Advances, Maturities Summary, Average Interst Rate of Amounts	0.00%		0.00%
Des Moines
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]
Carrying value of the loans pledged	$ 633,500		$ 773,500
Availability under the secured line of credit			439,700
Investment in capital stock			$ 4,400

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FHLB Repayments

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Federal Home Loan Bank, Advances, Maturities Summary, Average Interst Rate of Amounts

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due within one year of the Balance Sheet date.

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Amount of Federal Home Loan Bank (FHLB) advances maturing between the next fiscal year and the fifth fiscal year following the latest fiscal year.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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