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Borrowings - Narrative (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Percent of assets	25.00%
Maximum borrowing capacity	$ 2,390,000,000	$ 2,360,000,000
Percent outstanding advances	100.00%
Borrowings	$ 530,495,000	$ 530,591,000
Weighted average interest rate	1.15%	1.15%
Interest rate, range minimum	0.44%
Interest rate, range maximum	2.02%
Unused funds	$ 1,860,000,000
Percent of qualifying assets	95.00%
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral	$ 3,170,000,000	$ 3,130,000,000
Securities Investment
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	1,000,000
Amount outstanding	0	0
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	742,900,000
Putable
Debt Instrument [Line Items]
Borrowings	$ 20,500,000	$ 20,600,000

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Federal Reserve Bank Maximum Borrowing Capacity, As Percent Of Outstanding Principal Balance Of Qualifying Assets

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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