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Borrowings (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Extinguished and Matured Debt							$ 232,000	$ 268,000
Total Of Debt Matured and ExtinguishedUnder Repurchased Agreement								$ 500,000
Other borrowings	$ 0		$ 0		$ 61
Subordinated Debt	36,083		36,083		36,083
Gains Losses On Extinguishment Of Debt	0	$ 0	(80)	$ (12,000)
Due Date 6 2019 Member [Member]
Debt Instrument [Line Items]
Extinguished and Matured Debt						$ 25,000
Due Date 12 2019 Member [Member]
Debt Instrument [Line Items]
Extinguished and Matured Debt						$ 75,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Loans pledged as collateral to secure FHLB advances	1,300,000		1,300,000		1,400,000
Additional Borrowing Capacity	849,500		$ 849,500		$ 1,200,000
Weighted average period remaining maturity of FHLB advances			5.1 months		10.6 months
Interest Payable	$ 312		$ 312
Minimum amount of qualifying collateral	110.00%		110.00%
Repurchase agreement
Debt Instrument [Line Items]
Interest Payable	$ 581		$ 581		$ 1,500

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Amount of debt which was extinguished prior to their maturity, selling assets like investments.

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Minimum amount of qualifying collateral of the fair value of outstanding advances.

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Total amount of the debt matured under an agreement to repurchase.

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

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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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Amount of interest payable on debt, including, but not limited to, trade payables.

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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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