XML 110 R94.htm IDEA: XBRL DOCUMENT
v3.24.0.1

DEPOSITS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023
Statistical Disclosure for Banks [Abstract] |  |
Demand and savings deposits | $ 438.7 |
Maturity deposits decline | 1,100.0 |
Non-maturity deposits decline | 623.6 |
Deposits exceeding FDIC amount | $ 8,100.0 | $ 8,600.0

X
- Definition Increase (Decrease) In Maturity Deposit Accounts + References No definition available. + Details
Name: | frme_IncreaseDecreaseInMaturityDepositAccounts
Namespace Prefix: | frme_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (Decrease) In Non-Maturity Deposit Accounts + References No definition available. + Details
Name: | frme_IncreaseDecreaseInNonMaturityDepositAccounts
Namespace Prefix: | frme_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | srt_StatisticalDisclosureForBanksAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of uninsured deposit liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1406 -Paragraph (e) -Publisher SEC + Details
Name: | us-gaap_DepositLiabilityUninsured
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481160/942-230-45-1 + Details
Name: | us-gaap_IncreaseDecreaseInDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration