Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities
Net income	$ 11,356us-gaap_ProfitLoss	$ 8,068us-gaap_ProfitLoss	$ 5,713us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash
Depreciation	1,074us-gaap_Depreciation	1,161us-gaap_Depreciation	1,286us-gaap_Depreciation
Provision for loan losses	2,250us-gaap_ProvisionForLoanAndLeaseLosses	4,500us-gaap_ProvisionForLoanAndLeaseLosses	8,500us-gaap_ProvisionForLoanAndLeaseLosses
Stock compensation expense	1us-gaap_ShareBasedCompensation	2us-gaap_ShareBasedCompensation	2us-gaap_ShareBasedCompensation
Deferred income tax expense	1,004us-gaap_DeferredIncomeTaxExpenseBenefit	1,786us-gaap_DeferredIncomeTaxExpenseBenefit	(502)us-gaap_DeferredIncomeTaxExpenseBenefit
Loans originated for sale	(2,663)	(8,754)	(8,258)
Proceeds from loans sold	2,457	8,660	8,032
Securities losses	(213)	(240)	(2,348)
Other-than-temporary impairment of securities	1	118	451
Loss on disposal of assets	815us-gaap_GainsLossesOnSalesOfAssets	501us-gaap_GainsLossesOnSalesOfAssets	677us-gaap_GainsLossesOnSalesOfAssets
Write down of foreclosed properties	3,771us-gaap_ImpairmentOfRealEstate	3,722us-gaap_ImpairmentOfRealEstate	6,862us-gaap_ImpairmentOfRealEstate
Amortization of securities premiums (accretion of discounts), net	5,279	6,032	4,622
Amortization of goodwill and purchase accounting adjustments, net	262	363	363
Tax benefit of exercise of stock options	0	16	0
Decrease in accrued interest receivable	(169)	(48)	163
Increase in cash surrender value of bank owned life insurance	(1,088)	(1,058)	(269)
(Increase) decrease in other assets	(55)	2,478	(2,289)
Increase (decrease) in other liabilities	1,520	860	(1,259)
Net cash provided by operating activities	25,602	28,167	21,746
Cash Flows from Investing Activities
Proceeds from maturities and calls of securities available for sale	4,051	2,669	4,618
Proceeds from sales of securities available for sale	80,914	54,340	72,056
Principal payments received on securities available for sale	34,390	62,179	66,377
Purchases of securities available for sale	(111,438)	(137,755)	(141,297)
Purchases of other investments	(3,899)smmf_PurchasesOfOtherInvestments	(2,960)smmf_PurchasesOfOtherInvestments	0smmf_PurchasesOfOtherInvestments
Redemption of Federal Home Loan Bank Stock	5,532	6,531	4,763
Proceeds from maturities and calls of other investments	0	0	2,000
Net principal payments received on loans	(87,983)	(16,225)	11,906
Purchases of premises and equipment	(511)	(677)	(343)
Proceeds from disposal of premises and equipment	9	37	0
Proceeds from sales of other repossessed assets & property held for sale	14,602	10,654	9,373
Purchase of life insurance contracts	0	(5,000)	0
Net cash provided by (used in) investing activities	(64,333)	(26,207)	29,453
Cash Flows from Financing Activities
Net increase in demand deposit, NOW and savings accounts	100,174	3,524	13,390
Net decrease in time deposits	(42,672)us-gaap_IncreaseDecreaseInTimeDeposits	(26,837)us-gaap_IncreaseDecreaseInTimeDeposits	(2,764)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in short-term borrowings	60,865	58,810	(11,998)
Proceeds from long-term borrowings	0	3,454	0
Repayment of long-term borrowings	(86,027)us-gaap_RepaymentsOfLongTermDebt	(43,251)us-gaap_RepaymentsOfLongTermDebt	(66,986)us-gaap_RepaymentsOfLongTermDebt
Net proceeds from issuance of common stock	7,822	0	0
Exercise of stock options	71	96	0
Dividends paid on preferred stock	(774)	(776)	(731)
Net cash provided by (used in) financing activities	39,459	(4,980)	(69,089)
Increase in cash and cash equivalents	728	(3,020)	(17,890)
Cash and cash equivalents:
Beginning	11,782	14,802	32,692
Ending	12,510	11,782	14,802
Cash payments for:
Interest	15,862us-gaap_InterestPaid	18,920us-gaap_InterestPaid	24,745us-gaap_InterestPaid
Income taxes	2,843us-gaap_IncomeTaxesPaid	1,118us-gaap_IncomeTaxesPaid	2,642us-gaap_IncomeTaxesPaid
Supplemental Schedule of Noncash Investing and Financing Activities
Other assets acquired in settlement of loans	$ 2,961us-gaap_FairValueOfAssetsAcquired	$ 11,823us-gaap_FairValueOfAssetsAcquired	$ 8,363us-gaap_FairValueOfAssetsAcquired

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Amount of expense related to estimated loss from loan and lease transactions.

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