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	$ 62,121us-gaap_NetIncomeLoss	$ 56,808us-gaap_NetIncomeLoss	$ 51,008us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,100us-gaap_ProvisionForLoanAndLeaseLosses	11,000us-gaap_ProvisionForLoanAndLeaseLosses	18,500us-gaap_ProvisionForLoanAndLeaseLosses
Gains on sales of loans	(4,451)us-gaap_GainLossOnSalesOfLoansNet	(7,108)us-gaap_GainLossOnSalesOfLoansNet	(9,645)us-gaap_GainLossOnSalesOfLoansNet
Proceeds from sales of loans	153,743	218,237	314,521
Loans originated for sale	(150,795)	(198,683)	(303,723)
Gain on sale of investment securities	0us-gaap_GainLossOnSaleOfInvestments	(1,133)us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments
Net gains from sales/writedowns of other real estate and repossessed assets	(1,886)	(2,943)	(1,532)
Net (gain) loss on disposal of premises and equipment and branch bank properties	172us-gaap_GainLossOnDispositionOfAssets	(281)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Depreciation of premises and equipment	8,980us-gaap_DepreciationNonproduction	8,713us-gaap_DepreciationNonproduction	8,142us-gaap_DepreciationNonproduction
Amortization and impairment of intangible assets	3,545us-gaap_AmortizationOfIntangibleAssets	3,492us-gaap_AmortizationOfIntangibleAssets	3,969us-gaap_AmortizationOfIntangibleAssets
Net amortization of premiums and discounts on investment securities	4,497	4,196	4,795
Share-based compensation expense	2,931us-gaap_ShareBasedCompensation	2,854us-gaap_ShareBasedCompensation	1,865us-gaap_ShareBasedCompensation
Deferred income tax	(1,700)us-gaap_DeferredIncomeTaxExpenseBenefit	635us-gaap_DeferredIncomeTaxExpenseBenefit	12,668us-gaap_DeferredIncomeTaxExpenseBenefit
Contributions to defined benefit pension plan	0us-gaap_PensionContributions	(15,000)us-gaap_PensionContributions	(12,000)us-gaap_PensionContributions
Net decrease in interest receivable and other assets	781	6,478	4,261
Net increase in interest payable and other liabilities	5,893	2,414	2,337
Net Cash Provided by Operating Activities	89,931	89,679	95,166
Investment securities — available-for-sale:
Proceeds from maturities, calls and principal reductions	165,749	154,959	268,848
Proceeds from sales and redemptions	0	38,028	0
Purchases	0	(304,264)	(191,689)
Investment securities — held-to-maturity:
Proceeds from maturities, calls and principal reductions	83,989	65,790	55,352
Purchases	(127,187)	(109,655)	(102,034)
Net increase in loans	(586,121)	(502,687)	(330,760)
Proceeds from sales of other real estate and repossessed assets	12,486	18,018	24,341
Purchases of premises and equipment, net	(13,411)	(8,664)	(10,303)
Cash acquired, net of cash paid, in business combinations	(14,260)us-gaap_CashAcquiredFromAcquisition	0us-gaap_CashAcquiredFromAcquisition	339,372us-gaap_CashAcquiredFromAcquisition
Net Cash Provided by (Used in) Investing Activities	(478,755)	(648,475)	53,127
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	277,781	341,568	307,972
Net decrease in time deposits	(115,642)us-gaap_IncreaseDecreaseInTimeDeposits	(140,626)us-gaap_IncreaseDecreaseInTimeDeposits	(157,425)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in short-term borrowings	62,039	16,965	6,677
Repayment of FHLB advances	0	(34,289)	(8,768)
Repayment of subordinated debt obligations	(10,310)us-gaap_RepaymentsOfSubordinatedDebt	0us-gaap_RepaymentsOfSubordinatedDebt	0us-gaap_RepaymentsOfSubordinatedDebt
Cash dividends paid	(29,528)us-gaap_PaymentsOfDividendsCommonStock	(24,521)us-gaap_PaymentsOfDividendsCommonStock	(22,566)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of common stock, net of issuance costs	76,175	53,925	0
Proceeds from directors' stock purchase plan and exercise of stock options	1,242us-gaap_ProceedsFromStockPlans	806us-gaap_ProceedsFromStockPlans	260us-gaap_ProceedsFromStockPlans
Cash paid for payroll taxes upon conversion of restricted stock units	(701)	(379)	(248)
Net Cash Provided by Financing Activities	261,056	213,449	125,902
Net Increase (Decrease) in Cash and Cash Equivalents	(127,768)	(345,347)	274,195
Cash and Cash Equivalents at Beginning of Year	310,788	656,135	381,940
Cash and Cash Equivalents at End of Year	183,020	310,788	656,135
Supplemental Disclosure of Cash Flow Information:
Interest paid	14,823us-gaap_InterestPaid	18,047us-gaap_InterestPaid	23,859us-gaap_InterestPaid
Federal income taxes paid	25,900us-gaap_IncomeTaxesPaid	19,150us-gaap_IncomeTaxesPaid	9,029us-gaap_IncomeTaxesPaid
Loans transferred to other real estate and repossessed assets	11,308us-gaap_TransferOfOtherRealEstate	6,382us-gaap_TransferOfOtherRealEstate	15,794us-gaap_TransferOfOtherRealEstate
Closed branch offices transferred to other real estate	841	382	0
Business combinations:
Fair value of tangible assets acquired (noncash)	747,181chfc_FairValueOfTangibleAssetsAcquired	0chfc_FairValueOfTangibleAssetsAcquired	52,337chfc_FairValueOfTangibleAssetsAcquired
Goodwill and identifiable intangible assets acquired	82,090	0	12,350
Liabilities assumed	$ 815,011us-gaap_LiabilitiesAssumed1	$ 0us-gaap_LiabilitiesAssumed1	$ 404,059us-gaap_LiabilitiesAssumed1

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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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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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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 amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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The cash inflow from the additional capital contribution to the entity.

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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 net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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- Definition

The cash inflow associated with the amount received from the stock plan during the period.

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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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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-Topic 230

-SubTopic 10

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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 value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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No definition available.

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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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