Debt Outstanding [Line Items]

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
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

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+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Short-Term Borrowings and Long-Term Debt - Outstanding Short Term Borrowings and Long Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2015	Sep. 30, 2010
Debt Outstanding [Line Items]
Short-term borrowings	$ 631,412,000	$ 1,033,730,000
Total long-term debt	$ 696,465,000	$ 695,492,000
3.50% Senior Notes
Debt Outstanding [Line Items]
Principal value			$ 350,000,000
Stated interest rate	3.50%	3.50%
5.375% Senior Notes
Debt Outstanding [Line Items]
Principal value				$ 350,000,000
Stated interest rate	5.375%
Senior Notes \| 3.50% Senior Notes
Debt Outstanding [Line Items]
Maturity	Jan. 29, 2025
Principal value	$ 350,000,000
Total long-term debt	$ 347,639,000	$ 347,303,000
Senior Notes \| 5.375% Senior Notes
Debt Outstanding [Line Items]
Maturity	Sep. 15, 2020
Principal value	$ 350,000,000
Total long-term debt	348,826,000	$ 348,189,000
Stated interest rate		5.375%
Short-term FHLB advances
Debt Outstanding [Line Items]
Principal value	300,000,000
Short-term borrowings	300,000,000	$ 700,000,000
Federal funds purchased
Debt Outstanding [Line Items]
Principal value	0
Short-term borrowings	0	330,000,000
Securities sold under agreement to repurchase
Debt Outstanding [Line Items]
Principal value	319,414,000
Short-term borrowings	319,414,000	0
Other short-term borrowings
Debt Outstanding [Line Items]
Principal value	11,998,000
Short-term borrowings	$ 11,998,000	$ 3,730,000