CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 28,996us-gaap_NetIncomeLoss	$ 26,345us-gaap_NetIncomeLoss	$ 27,258us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,500us-gaap_ProvisionForLoanAndLeaseLosses	4,534us-gaap_ProvisionForLoanAndLeaseLosses	9,850us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation expense	5,886us-gaap_DepreciationNonproduction	5,783us-gaap_DepreciationNonproduction	5,440us-gaap_DepreciationNonproduction
Amortization of mortgage servicing rights	1,004	1,472	1,964
(Recovery)/additional impairment of valuation allowance on mortgage servicing rights	25	(750)	676
Securities amortization, net	1,973	3,031	4,717
Amortization of purchased intangible assets	1,690us-gaap_AmortizationOfIntangibleAssets	1,868us-gaap_AmortizationOfIntangibleAssets	1,835us-gaap_AmortizationOfIntangibleAssets
Earnings on cash surrender value of life insurance policies	(1,298)us-gaap_BankOwnedLifeInsuranceIncome	(1,378)us-gaap_BankOwnedLifeInsuranceIncome	(1,206)us-gaap_BankOwnedLifeInsuranceIncome
Securities gains, net of impairment	(24)us-gaap_GainLossOnInvestments	(835)us-gaap_GainLossOnInvestments	(1,367)us-gaap_GainLossOnInvestments
Gain on loans sold	(4,730)us-gaap_GainLossOnSaleOfLoansAndLeases	(5,464)us-gaap_GainLossOnSaleOfLoansAndLeases	(7,068)us-gaap_GainLossOnSaleOfLoansAndLeases
Loans originated for sale	(165,827)	(218,288)	(246,596)
Proceeds from loan sales	168,832msfg_ProceedsFromTheSaleOfMortgageLoans	234,778msfg_ProceedsFromTheSaleOfMortgageLoans	253,259msfg_ProceedsFromTheSaleOfMortgageLoans
Stock based compensation expense	647us-gaap_ShareBasedCompensation	751us-gaap_ShareBasedCompensation	491us-gaap_ShareBasedCompensation
Stock portion of director retainer fee expense	359msfg_DirectorRetainerFeeExpense	367msfg_DirectorRetainerFeeExpense	338msfg_DirectorRetainerFeeExpense
Loss on sale and write-down of OREO	153	539	1,359
Prepayment penalty on FHLB advance		2,239	1,313
Change in other assets and liabilities	4,172	5,091	1,916
Net cash provided by operating activities	43,358	60,083	54,179
Investing Activities
Net change in short term investments	(1,915)
Purchases of securities available for sale	(61,756)	(233,958)	(220,543)
Proceeds from calls, maturities, and payments on securities available for sale	106,268	125,010	131,130
Proceeds from sales of securities available for sale	27,131	80,151	64,176
Loan originations and payments, net	(110,124)us-gaap_ProceedsFromLoanOriginations1	(128,650)us-gaap_ProceedsFromLoanOriginations1	(15,060)us-gaap_ProceedsFromLoanOriginations1
Purchases of premises and equipment	(5,593)	(7,631)	(7,387)
Proceeds from sale of OREO	3,864	6,023	12,706
Purchase of life insurance policies		(504)	(10,000)
Proceeds from redemption of FHLB stock	3,251	10	217
Proceeds from life insurance benefit	588
Cash received/(paid) from bank/branch acquisitions, net	(10,686)us-gaap_CashAcquiredFromAcquisition	18,157us-gaap_CashAcquiredFromAcquisition	5,464us-gaap_CashAcquiredFromAcquisition
Net cash provided/(used) by investing activities	(48,972)	(141,392)	(39,297)
Financing Activities
Net change in deposits	83,796us-gaap_IncreaseDecreaseInDeposits	(6,594)us-gaap_IncreaseDecreaseInDeposits	(11,709)us-gaap_IncreaseDecreaseInDeposits
Net change in other borrowings	(13,293)	4,075	8,730
Proceeds from FHLB advances	825,000	665,000	95,000
Repayment of FHLB advances	(874,745)	(560,433)	(106,688)
Cash dividends on preferred stock		(470)	(1,967)
Cash dividends on common stock	(8,726)us-gaap_PaymentsOfDividendsCommonStock	(5,709)us-gaap_PaymentsOfDividendsCommonStock	(1,623)us-gaap_PaymentsOfDividendsCommonStock
Purchase of treasury shares	(319)	(204)
Repurchase of preferred stock		(15,100)	(40,255)
Repayment of subordinated debentures, net	(5,000)us-gaap_RepaymentsOfSubordinatedDebt	(4,000)us-gaap_RepaymentsOfSubordinatedDebt
Proceeds from exercise of stock options, including tax benefit	66	414	132
Net cash provided/(used) by financing activities	6,779	76,979	(58,380)
Net change in cash and cash equivalents	1,165	(4,330)	(43,498)
Cash and cash equivalents, beginning of year	61,320	65,650	109,148
Cash and cash equivalents, end of year	62,485	61,320	65,650
Supplemental cash flow information
Interest paid	8,807us-gaap_InterestPaid	10,375us-gaap_InterestPaid	15,382us-gaap_InterestPaid
Income taxes paid	4,725us-gaap_IncomeTaxesPaidNet	2,400us-gaap_IncomeTaxesPaidNet	3,893us-gaap_IncomeTaxesPaidNet
Supplemental non cash disclosure
Loan balances transferred to foreclosed real estate	$ 2,585us-gaap_TransferOfOtherRealEstate	$ 4,005us-gaap_TransferOfOtherRealEstate	$ 5,286us-gaap_TransferOfOtherRealEstate

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The cash inflow associated with the amount received from holders exercising stock options including excess tax benefit, which the entity may have realized and reported separately.

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No definition available.

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Cash received from the sale of mortgage loans to governmental agencies.

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No definition available.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The amount of cash paid for interest during the period.

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash outflow to reacquire common stock during the period.

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The cash outflow to reacquire preferred stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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The cash inflow from a borrowing made from Federal Home Loan Bank.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of cash inflow from sale of Federal Reserve Bank (FRB) stock.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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

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The cash outflow for the payment of loan drawn from Federal Home Loan.

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value transferred out of real estate owned (REO) in noncash transactions.

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