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Borrowings - Narrative (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Percent of assets	30.00%
Maximum amount available	$ 1,800,000,000	$ 1,800,000,000
Percent outstanding advances	100.00%
Borrowings	421,352,000	420,722,000
Weighted average interest rate	1.16%	1.24%
Interest rate, range minimum	0.47%
Interest rate, range maximum	3.81%
Unused funds	1,360,000,000
Percent of qualifying assets	95.00%
Mortgage loans on real estate
Debt Instrument [Line Items]
Collateral pledged	2,300,000,000	2,300,000,000
Securities investment
Debt Instrument [Line Items]
Collateral pledged	13,200,000	0
Asset balance used to determine maximum borrowing capacity from federal reserve bank	2,000,000
Amount outstanding	0
Qualifying loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	635,400,000
Putable
Debt Instrument [Line Items]
Borrowings	$ 51,400,000	$ 66,700,000

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

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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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