Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 57,139us-gaap_NetIncomeLoss	$ 53,455us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided and used by operating activities:
Provision for loan losses	8,248us-gaap_ProvisionForLoanAndLeaseLosses	14,536us-gaap_ProvisionForLoanAndLeaseLosses
Increase (Decrease) in Provision for Deferred Income Taxes	(1,663)	3,081
Depreciation, Depletion and Amortization	14,739	8,367
Benefit attributable to FDIC loss share	4,227	4,824
Accretion of acquired loans	(26,339)	(37,965)
Amortization and accretion of investment securities, net
Available for sale	2,680fmer_AvailableForSaleAmortization	1,949fmer_AvailableForSaleAmortization
Held to maturity	814	2,089
Losses/(gains) on sales and calls of available-for-sale investment securities, net	(354)	(56)
Originations of loans held for sale	(40,442)	(61,109)
Proceeds from sales of loans, primarily mortgage loans sold in the secondary markets	50,868	66,904
Gains on sales of loans, net	(566)us-gaap_GainLossOnSalesOfLoansNet	(1,316)us-gaap_GainLossOnSalesOfLoansNet
Amortization of Intangible Assets	2,598us-gaap_AmortizationOfIntangibleAssets	2,936us-gaap_AmortizationOfIntangibleAssets
Share-based Compensation	3,641us-gaap_ShareBasedCompensation	3,766us-gaap_ShareBasedCompensation
Net decrease/(increase) in other assets	(48,684)	6,506
Net increase/(decrease) in other liabilities	25,224	26,800
NET CASH PROVIDED BY OPERATING ACTIVITIES	52,130	94,767
Proceeds from sale of investment securities
Available for sale	39,302	7,809
Proceeds from Sale of Other Investments	0	32,486
Held to maturity	1,015	2,495
Proceeds from prepayments, calls, and maturities of investment securities
Available for sale	129,296	112,747
Held to maturity	92,241	61,734
Proceeds from Sale and Maturity of Other Investments	166	0
Purchases of investment securities
Available for sale	(404,163)	(245,403)
Held to maturity	(46,164)	(214,611)
Other	0	(142)
Net decrease/(increase) in loans and leases	(152,359)	(277,708)
Purchases of premises and equipment	(5,795)	(16,859)
Sales of premises and equipment	7,965	11,259
NET CASH PROVIDED/(USED) BY INVESTING ACTIVITIES	(338,496)	(526,193)
Financing Activities
Net increase in demand accounts	128,320	191,793
Net increase/(decrease) in savings and money market accounts	210,941	163,015
Net decrease in certificates and other time deposits	81,669us-gaap_IncreaseDecreaseInTimeDeposits	(76,735)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase/(decrease) in securities sold under agreements to repurchase	(159,220)	74,660
Net increase/(decrease) in long-term debt	0	0
Net increase/(decrease) in wholesale borrowings	(111,443)	148,677
Net proceeds from issuance of preferred stock	0	0
Cash dividends - common	(26,461)us-gaap_PaymentsOfDividendsCommonStock	(26,335)us-gaap_PaymentsOfDividendsCommonStock
Cash dividends - preferred	(1,469)	(1,469)
Restricted stock activity	(970)	(717)
NET CASH PROVIDED/(USED) BY FINANCING ACTIVITIES	121,367	472,889
Increase/(Decrease) in cash and cash equivalents	(164,999)	41,463
Cash and cash equivalents at beginning of year	697,424	917,822
Cash and cash equivalents at end of year	532,425	959,285
Cash paid during period for:
Interest	14,036us-gaap_InterestPaidNet	11,140us-gaap_InterestPaidNet
Federal income taxes	$ 2,000us-gaap_IncomeTaxesPaid	$ 0us-gaap_IncomeTaxesPaid

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- Definition

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.

+ References

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash flow from investments sold under the agreement to repurchase such investment.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

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- Definition

Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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

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-Glossary Investing Activities

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a),(b)

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- Definition

The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a)

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 21

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-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

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.

+ References

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- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 11B

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

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.

+ References

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