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	$ 16,459us-gaap_NetIncomeLoss	$ 13,446us-gaap_NetIncomeLoss	$ 12,149us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,065us-gaap_DepreciationAndAmortization	4,114us-gaap_DepreciationAndAmortization	4,543us-gaap_DepreciationAndAmortization
Net premium amortization of investment securities:
Provision for loan losses	(4,364)us-gaap_ProvisionForLoanLossesExpensed	(2,600)us-gaap_ProvisionForLoanLossesExpensed	2,772us-gaap_ProvisionForLoanLossesExpensed
Deferred income tax expense (benefit)	3,931us-gaap_DeferredIncomeTaxExpenseBenefit	(473)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,043)us-gaap_DeferredIncomeTaxExpenseBenefit
Mortgage loans originated for sale	(25,498)	(52,016)	(84,496)
Proceeds from sale of mortgage loans	29,254	50,957	86,563
Gains on sale of mortgage loans, net	(490)us-gaap_GainLossOnSaleOfMortgageLoans	(1,036)us-gaap_GainLossOnSaleOfMortgageLoans	(1,918)us-gaap_GainLossOnSaleOfMortgageLoans
(Gain) loss on disposal and write downs of premises and equipment, net	(5)	7	257
Net loss on sale and write downs of other real estate	3,404	5,702	4,084
Net loss (gain) on sale of available for sale investment securities	63us-gaap_GainLossOnSaleOfSecuritiesNet	50us-gaap_GainLossOnSaleOfSecuritiesNet	(1,209)us-gaap_GainLossOnSaleOfSecuritiesNet
Increase in cash surrender value of company-owned life insurance	(926)	(926)	(961)
Death benefits in excess of cash surrender value on company-owned life insurance	(276)	0	(529)
Decrease in accrued interest receivable	276	173	545
(Increase) decrease in other assets	(1,860)	(241)	1,296
Decrease in accrued interest payable	(193)	(233)	(1,005)
Increase in other liabilities	1,096	2,036	2,014
Net cash provided by operating activities	29,011	24,023	28,410
Proceeds from maturities and calls of investment securities:
Available for sale	88,905	123,231	219,141
Held to maturity	60	55	55
Proceeds from sale of available for sale investment securities	12,967	2,233	135,193
Purchase of investment securities:
Available for sale	(105,888)	(190,306)	(333,116)
Held to maturity	(3,065)	0	0
Proceeds from sale of restricted stock investments, net	148	0	0
Principal collected on loans originated for investment, net	56,695	5,540	29,818
Proceeds from death benefits of company-owned life insurance	738	0	1,051
Purchases of premises and equipment	(2,138)	(3,525)	(1,675)
Proceeds from sale of other real estate	8,811	9,458	12,278
Proceeds from disposals of premises and equipment	21	28	429
Net cash provided by (used in) investing activities	57,254	(53,286)	63,174
Cash Flows from Financing Activities
Net decrease in deposits	(23,054)us-gaap_IncreaseDecreaseInDeposits	(595)us-gaap_IncreaseDecreaseInDeposits	(24,255)us-gaap_IncreaseDecreaseInDeposits
Net (decrease) increase in federal funds purchased and other short-term borrowings	(533)	5,040	(2,939)
Proceeds from securities sold under agreements to repurchase and other long-term borrowings	9	754	0
Repayments of securities sold under agreements to repurchase and other long-term borrowings	(8,165)	(2,171)	(61,397)
Redemption of preferred stock	(20,000)	0	0
Dividends paid, preferred stock	(1,990)	(1,500)	(1,500)
Repurchase of common stock warrant	0us-gaap_PaymentsForRepurchaseOfWarrants	0us-gaap_PaymentsForRepurchaseOfWarrants	(75)us-gaap_PaymentsForRepurchaseOfWarrants
Shares issued under employee stock purchase plan	129	133	128
Net cash (used in) provided by financing activities	(53,604)	1,661	(90,038)
Net increase (decrease) in cash and cash equivalents	32,661	(27,602)	1,546
Cash and cash equivalents at beginning of year	68,253	95,855	94,309
Cash and cash equivalents at end of year	100,914	68,253	95,855
Supplemental Disclosures
Interest	10,346us-gaap_InterestPaid	12,228us-gaap_InterestPaid	19,263us-gaap_InterestPaid
Income taxes	2,850us-gaap_IncomeTaxesPaid	6,150us-gaap_IncomeTaxesPaid	3,800us-gaap_IncomeTaxesPaid
Sale and financing of other real estate	2,525ffkt_SaleAndFinancingOfOtherRealEstate	5,711ffkt_SaleAndFinancingOfOtherRealEstate	3,358ffkt_SaleAndFinancingOfOtherRealEstate
Available-for-sale Securities [Member]
Net premium amortization of investment securities:
Net premuim amortization of investment securities	3,919	5,027	5,312
Held-to-maturity Securities [Member]
Net premium amortization of investment securities:
Net premuim amortization of investment securities	42	0	0
From Loans [Member]
Supplemental Disclosures
Transfers to other real estate	8,259	6,110	33,913
From Premises [Member]
Supplemental Disclosures
Transfers to other real estate	0	0	212
Employee Stock Purchase Plan Expense [Member]
Net premium amortization of investment securities:
Noncash compensation expense	32	36	36
Director Fee Compensation [Member]
Net premium amortization of investment securities:
Noncash compensation expense	$ 82	$ 0	$ 0

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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 amount of cash paid for the origination of mortgages that are held for sale.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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The cash outflow for reacquisition of callable preferred stock.

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The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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Amount of cash outflow in the form of ordinary dividends to preferred 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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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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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 cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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No definition available.

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

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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 cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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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 Home Loan Bank (FHLB) stock.

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No definition available.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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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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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of expense related to loss from loan transactions.

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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 from mortgage loans to real estate owned (REO) in noncash transactions.

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