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Borrowings - Narrative (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Percent of assets	30.00%
Maximum borrowing capacity	$ 1,960,000,000	$ 1,780,000,000
Percent outstanding advances	100.00%
Pledged as collateral		13,200,000
Borrowings	467,071,000	421,352,000
Weighted average interest rate	1.14%	1.16%
Interest rate, range minimum	0.47%
Interest rate, range maximum	3.51%
Unused funds	1,490,000,000
Percent of qualifying assets	95.00%
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral	2,600,000,000	2,330,000,000
Securities Investment
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	1,600,000
Amount outstanding	0	0
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	599,000,000
Putable
Debt Instrument [Line Items]
Borrowings	$ 37,100,000	$ 51,400,000

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Federal Home Loan Bank, Advances, Maximum Borrowing Capacity, Percent of Assets

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

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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States the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the highest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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States the weighted average interest rate applicable to the advances from the Federal Home Loan Bank outstanding as of the Balance Sheet date.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount borrowed under the credit facility as of the balance sheet date.

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