Collateral Dependant Impaired and Non Accrual Loans Carrying Amount

No definition available.

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- Definition

Determination Of Specific Allowance For Loan Losses

+ References

No definition available.

+ Details

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- Definition

Fair Value of Mortgage Servicing Rights

+ References

No definition available.

+ Details

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- Definition

Impaired and non accrual loans fair value disclosure.

+ References

No definition available.

+ Details

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- Definition

Impaired Collateral Dependant Loans, Recorded Investment

+ References

No definition available.

+ Details

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- Definition

Impairment of Covered Other Real Esate Owned

+ References

No definition available.

+ Details

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- Definition

Impairment of Noncovered Other Real Estate Owned

+ References

No definition available.

+ Details

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- Definition

Mortgage Servicing Rights.

+ References

No definition available.

+ Details

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- Definition

Mortgage Servicing Rights Net Carrying balance

+ References

No definition available.

+ Details

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- Definition

Mortgage Servicing rights Valuation Allowance

+ References

No definition available.

+ Details

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- Definition

Nonrecurring Fair Value

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Nonrecurring Fair Value Measurements [Abstract]

+ References

No definition available.

+ Details

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- Definition

Other Real Estate Covered by loss Share.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

True Up Liability.

+ References

No definition available.

+ Details

Name:	fmer_TrueUpLiability
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- References

No definition available.

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- Definition

Amount of expense recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeclosedRealEstateExpense
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

+ References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureRecurring
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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Carrying amount of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

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Fair Value Measurement (Recurring and Nonrecurring Table) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Recurring Fair Value Measurements
Available-for-sale	$ 4,104,214	$ 3,791,059	$ 3,967,735
Residential loans held for sale	5,249	3,568	5,472
Derivative Asset, Fair Value, Gross Asset	98,549	72,573	58,107
Total Assets, Fair Value Disclosure, Recurring	4,208,012	3,867,200	4,031,314
Derivative Liability, Fair Value, Gross Liability	78,621	65,447	52,745
True Up Liability	15,115	13,707	14,750
Total liabilities at fair value on a recurring basis	93,736	79,154	67,495
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	17,460	20,526	19,149
Impaired and Non Accrual Loans Fair Value Disclosure	86,315	63,839	71,428
Other Real Estate, Non Covered	13,629	16,956	18,576
Other Real Estate Covered by Loss Share		7,293	365
Nonrecurring Fair Value	117,404	108,614	109,518
Mortgage Servicing Rights	18,127	21,490	18,938	$ 22,011
Mortgage Servicing rights Valuation Allowance	(868)	(1,131)	(399)	$ (955)
Mortgage Servicing Rights Net Carrying balance	17,259	20,359	18,500
Mortgage Servicing Rights (MSR) Impairment (Recovery)	(469)	(176)	(600)
Impairment of Noncovered Other Real Estate Owned		900	4,500
Impairment of Covered Other Real Esate Owned		300	600
Impaired Collateral Dependant Loans, Recorded Investment	94,100	75,600	84,300
Determination Of Specific Allowance For Loan Losses	(7,800)	(11,800)	(12,900)
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	86,300	63,800	71,400
Foreclosed Real Estate Expense	2,000
Level 1
Recurring Fair Value Measurements
Available-for-sale	2,873	2,869	2,821
Residential loans held for sale	0	0	0
Derivative Asset, Fair Value, Gross Asset	0	0	0
Total Assets, Fair Value Disclosure, Recurring	2,873	2,869	2,821
Derivative Liability, Fair Value, Gross Liability	0	0	0
True Up Liability	0	0	0
Total liabilities at fair value on a recurring basis	0	0	0
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	0	0	0
Impaired and Non Accrual Loans Fair Value Disclosure	0	0	0
Other Real Estate, Non Covered	0	0	0
Other Real Estate Covered by Loss Share		0	0
Nonrecurring Fair Value	0	0	0
Level 2
Recurring Fair Value Measurements
Available-for-sale	3,767,184	3,441,959	3,623,270
Residential loans held for sale	5,249	3,568	5,472
Derivative Asset, Fair Value, Gross Asset	98,549	72,573	58,107
Total Assets, Fair Value Disclosure, Recurring	3,870,982	3,518,100	3,686,849
Derivative Liability, Fair Value, Gross Liability	78,621	65,447	52,745
True Up Liability	0	0	0
Total liabilities at fair value on a recurring basis	78,621	65,447	52,745
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	0	0	0
Impaired and Non Accrual Loans Fair Value Disclosure	0	0	0
Other Real Estate, Non Covered	0	0	0
Other Real Estate Covered by Loss Share		0	0
Nonrecurring Fair Value	0	0	0
Level 3
Recurring Fair Value Measurements
Available-for-sale	334,157	346,231	341,644
Residential loans held for sale	0	0	0
Derivative Asset, Fair Value, Gross Asset	0	0	0
Total Assets, Fair Value Disclosure, Recurring	334,157	346,231	341,644
Derivative Liability, Fair Value, Gross Liability	0	0	0
True Up Liability	15,115	13,707	14,750
Total liabilities at fair value on a recurring basis	15,115	13,707	14,750
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	17,460	20,526	19,149
Impaired and Non Accrual Loans Fair Value Disclosure	86,315	63,839	71,428
Other Real Estate, Non Covered	13,629	16,956	18,576
Other Real Estate Covered by Loss Share		7,293	365
Nonrecurring Fair Value	117,404	108,614	109,518
US Treasury Securities
Recurring Fair Value Measurements
Available-for-sale			5,000
Equity Securities
Recurring Fair Value Measurements
Available-for-sale	2,873	2,869	2,821
Equity Securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale		2,869	2,821
Equity Securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale		0	0
Equity Securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale		0	0
US Government Agency Debentures
Recurring Fair Value Measurements
Available-for-sale		2,513
US Government Agency Debentures \| Level 1
Recurring Fair Value Measurements
Available-for-sale		0
US Government Agency Debentures \| Level 2
Recurring Fair Value Measurements
Available-for-sale		2,513
US Government Agency Debentures \| Level 3
Recurring Fair Value Measurements
Available-for-sale		0
Non-marketable Equity Securities
Recurring Fair Value Measurements
Available-for-sale			5,000
Non-marketable Equity Securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale			0
Non-marketable Equity Securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale			5,000
Non-marketable Equity Securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale			0
Marketable Equity Securities
Recurring Fair Value Measurements
Available-for-sale	2,873	2,869	2,821
Marketable Equity Securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale	2,873
Marketable Equity Securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale	0
Marketable Equity Securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0
US Government Agencies Debt Securities
Recurring Fair Value Measurements
Available-for-sale	2,520	2,513	2,498
US Government Agencies Debt Securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0
US Government Agencies Debt Securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale	2,520		2,498
US Government Agencies Debt Securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0
U.S. States and political subdivisions debt securities
Recurring Fair Value Measurements
Available-for-sale	173,141	215,164	192,795
U.S. States and political subdivisions debt securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
U.S. States and political subdivisions debt securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale	173,141	215,164	192,795
U.S. States and political subdivisions debt securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Recurring Fair Value Measurements
Available-for-sale	907,656	947,303	906,229
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 2
Recurring Fair Value Measurements
Available-for-sale		947,303	906,229
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Recurring Fair Value Measurements
Available-for-sale	184,248	140,359	172,109
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 2
Recurring Fair Value Measurements
Available-for-sale		140,359	172,109
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
Recurring Fair Value Measurements
Available-for-sale	2,226,737	1,892,560	2,128,320
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises \| Level 2
Recurring Fair Value Measurements
Available-for-sale		1,892,560	2,128,320
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
Recurring Fair Value Measurements
Available-for-sale	4	6	4
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency \| Level 2
Recurring Fair Value Measurements
Available-for-sale	0	1	0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency \| Level 3
Recurring Fair Value Measurements
Available-for-sale	4	5	4
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Recurring Fair Value Measurements
Available-for-sale	272,882	244,059	216,319
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 2
Recurring Fair Value Measurements
Available-for-sale		244,059	216,319
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises \| Level 3
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Corporate debt securities
Recurring Fair Value Measurements
Available-for-sale	48,756	52,264	52,229
Corporate debt securities \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Corporate debt securities \| Level 2
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Corporate debt securities \| Level 3
Recurring Fair Value Measurements
Available-for-sale		52,264	52,229
Collateralized Loan Obligations
Recurring Fair Value Measurements
Available-for-sale	285,397	293,962	289,411
Collateralized Loan Obligations \| Level 1
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Collateralized Loan Obligations \| Level 2
Recurring Fair Value Measurements
Available-for-sale	0	0	0
Collateralized Loan Obligations \| Level 3
Recurring Fair Value Measurements
Available-for-sale	285,397	293,962	289,411
Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	75,831	59,885	49,368
Derivative Liability, Fair Value, Gross Liability	$ 75,383	59,384	49,209
Not Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset
Interest Rate Swap \| Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	$ 22,718	12,688	8,739
Derivative Liability, Fair Value, Gross Liability	3,238	6,063	3,536
Interest Rate Swap \| Designated as Hedging Instrument \| Level 1
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Interest Rate Swap \| Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	22,718	12,688	8,739
Derivative Liability, Fair Value, Gross Liability	3,238	6,063	3,536
Interest Rate Swap \| Designated as Hedging Instrument \| Level 3
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Interest Rate Swap \| Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	75,139	59,147	48,920
Derivative Liability, Fair Value, Gross Liability	75,139	59,147	48,920
Interest Rate Swap \| Not Designated as Hedging Instrument \| Level 1
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Interest Rate Swap \| Not Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	75,139	59,147	48,920
Derivative Liability, Fair Value, Gross Liability	75,139	59,147	48,920
Interest Rate Swap \| Not Designated as Hedging Instrument \| Level 3
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Mortgage Loan Commitments \| Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	240	388	149
Derivative Liability, Fair Value, Gross Liability	0	0	0
Mortgage Loan Commitments \| Not Designated as Hedging Instrument \| Level 1
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Mortgage Loan Commitments \| Not Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	240	388	149
Mortgage Loan Commitments \| Not Designated as Hedging Instrument \| Level 3
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Forward sales contracts \| Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Liability, Fair Value, Gross Liability	82	68	5
Forward sales contracts \| Not Designated as Hedging Instrument \| Level 1
Recurring Fair Value Measurements
Derivative Liability, Fair Value, Gross Liability	0	0	0
Forward sales contracts \| Not Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Liability, Fair Value, Gross Liability	82	68	5
Forward sales contracts \| Not Designated as Hedging Instrument \| Level 3
Recurring Fair Value Measurements
Derivative Liability, Fair Value, Gross Liability	0	0	0
Foreign Exchange \| Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	452	350	299
Derivative Liability, Fair Value, Gross Liability	154	169	284
Foreign Exchange \| Not Designated as Hedging Instrument \| Level 1
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Foreign Exchange \| Not Designated as Hedging Instrument \| Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	452	350	299
Derivative Liability, Fair Value, Gross Liability	154	169	284
Foreign Exchange \| Not Designated as Hedging Instrument \| Level 3
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0	0	0
Derivative Liability, Fair Value, Gross Liability	$ 0	$ 0	$ 0