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Borrowings - Narrative (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Percent of assets	25.00%
Maximum borrowing capacity	$ 3,360,000,000	$ 3,380,000,000
Percent outstanding advances	100.00%
Advances from FHLB	$ 703,850,000	754,290,000
Unused funds	$ 2,640,000,000
Percent of qualifying assets	95.00%
Putable
Debt Instrument [Line Items]
Advances from FHLB	$ 20,100,000	$ 20,200,000
Weighted Average
Debt Instrument [Line Items]
FHLB advances, interest rate	1.29%	1.22%
Minimum
Debt Instrument [Line Items]
FHLB advances, interest rate	0.84%
Maximum
Debt Instrument [Line Items]
FHLB advances, interest rate	2.02%
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral	$ 5,500,000,000	$ 5,530,000,000
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	651,700,000
Securities Investment
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	5,700,000
Amount outstanding	$ 0	$ 0

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

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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 borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
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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 interest rate applicable to Federal Home Loan Bank advances outstanding 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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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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