Debt Disclosure [Line Items]

No definition available.

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- Definition

The amount shown on the books that a bank with insufficient reserves borrows, at the federal funds rate, from another bank to meet its reserve requirements and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, net of any reductions or offsets. Also reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

No definition available.

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- Definition

Market value of securities pledged as collateral

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

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

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average interest rate of short-term debt outstanding.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 29, 2015	Sep. 30, 2010	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 15, 2007	Oct. 30, 2003
Debt Disclosure [Line Items]
Interest expense, debt											$ 34,900,000	$ 23,200,000	$ 23,100,000
Weighted average interest rates associated with short-term borrowings			0.32%								0.32%
Short-term borrowings			$ 774,900,000				$ 7,781,000				$ 774,900,000	7,781,000
Proceeds from issuance of senior notes, net of discount and issuance cost											346,431,000	0	0
Distributions			$ 10,163,000	$ 10,131,000	$ 10,155,000	$ 9,891,000	$ 8,988,000	$ 8,761,000	$ 8,876,000	$ 8,696,000	40,340,000	35,321,000	32,277,000
Special Purpose Trust Entity
Debt Disclosure [Line Items]
Distributions											$ 3,500,000	$ 3,500,000	$ 3,500,000
3.50% Senior Notes
Debt Disclosure [Line Items]
Stated interest rate			3.50%								3.50%
Principal value	$ 350,000,000		$ 350,000,000								$ 350,000,000
Debt Instrument, Unamortized Discount			$ 300,000								$ 300,000
Maturity											Jan. 29, 2025
5.375% Senior Notes
Debt Disclosure [Line Items]
Stated interest rate			5.375%				5.375%				5.375%	5.375%
Principal value		$ 350,000,000	$ 350,000,000								$ 350,000,000
Maturity											Sep. 15, 2020
Payments for settlement of 3.875% Convertible Notes		250,000,000
Proceeds from issuance of senior notes, net of discount and issuance cost	$ 346,400,000	$ 345,000,000
3.875% Convertible Notes
Debt Disclosure [Line Items]
Stated interest rate							3.875%					3.875%
6.05% Subordinated Notes
Debt Disclosure [Line Items]
Debt Instrument, Unamortized Discount														$ 250,000,000
7.0% Junior Subordinated Debentures
Debt Disclosure [Line Items]
Principal value															$ 50,000,000.0
Debt issuance costs															$ 2,200,000
Federal Funds Purchased
Debt Disclosure [Line Items]
Principal value			135,000,000								$ 135,000,000
Maturity											Jan. 04, 2016
Short-term borrowings			135,000,000				$ 0				$ 135,000,000	$ 0
Federal Home Loan Bank Advances
Debt Disclosure [Line Items]
Principal value			638,000,000								$ 638,000,000
Maturity											Jan. 04, 2016
Market value of collateral pledged			1,300,000,000								$ 1,300,000,000
Unused and available funds			600,000,000								600,000,000
Federal Reserve Bank Advances
Debt Disclosure [Line Items]
Market value of collateral pledged			$ 900,000,000								$ 900,000,000
6.05% Subordinated Notes
Debt Disclosure [Line Items]
Stated interest rate			6.05%				6.05%				6.05%	6.05%
Principal value			$ 45,964,000								$ 45,964,000
Maturity											Jun. 01, 2017
7.0% Junior Subordinated Debentures
Debt Disclosure [Line Items]
Stated interest rate			7.00%				7.00%				7.00%	7.00%
Principal value			$ 50,000,000								$ 50,000,000
Maturity											Oct. 15, 2033