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Note 15 - Other Operating Expenses (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equipment Expense	$ 16,683,000	$ 14,352,000	$ 9,325,000
Equipment Rentals [Member]
Equipment Expense	2,300,000	2,600,000	1,900,000
Leasing of ATMs [Member]
Equipment Expense	1,338,000	1,463,000	1,283,000
Occupancy Expense [Member]
Operating Leases, Rent Expense	$ 4,643,000	$ 4,216,000	$ 3,706,000

X

- Definition

This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

+ References

No definition available.

+ Details

Name:	us-gaap_EquipmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=sfnc_EquipmentRentalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=sfnc_LeasingOfATMsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=sfnc_OccupancyExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: