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Allowance for Credit Losses, Credit Quality and Other - Presentation of Troubled Debt Restructurings ("TDRs") by Class (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of loans	21	44
Restructured loans, amount	$ 19,500	$ 11,140
Post modification outstanding balance	$ 24,610	5,745
Percentage of Total Class of Loans Receivable	0.17%
Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 3,225	790
Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	636	4,072
Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	149
Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	3,518
Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	938	$ 883
Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	5
Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	16,023
Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	116
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Modifications [Line Items]
Number of loans | contract		11
Restructured loans, amount		$ 4,462
Post modification outstanding balance	$ 18,306	2,429
Percentage of Total Class of Loans Receivable	0.33%
Commercial real estate loans | Non-farm/non-residential | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 398	598
Commercial real estate loans | Non-farm/non-residential | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0	1,395
Commercial real estate loans | Non-farm/non-residential | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Non-farm/non-residential | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	1,537
Commercial real estate loans | Non-farm/non-residential | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	348	$ 436
Commercial real estate loans | Non-farm/non-residential | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Non-farm/non-residential | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	16,023
Commercial real estate loans | Non-farm/non-residential | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Construction/ Land Development
Financing Receivable, Modifications [Line Items]
Number of loans | contract		1
Restructured loans, amount		$ 216
Post modification outstanding balance	$ 149	177
Percentage of Total Class of Loans Receivable	0.01%
Commercial real estate loans | Construction/ Land Development | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 0	0
Commercial real estate loans | Construction/ Land Development | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0	177
Commercial real estate loans | Construction/ Land Development | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Construction/ Land Development | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	149
Commercial real estate loans | Construction/ Land Development | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0	$ 0
Commercial real estate loans | Construction/ Land Development | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Construction/ Land Development | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial real estate loans | Construction/ Land Development | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Residential Real Estate | Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Number of loans | contract		14
Restructured loans, amount		$ 2,115
Post modification outstanding balance	$ 1,955	1,207
Percentage of Total Class of Loans Receivable	0.11%
Residential Real Estate | Residential 1-4 family | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 560	145
Residential Real Estate | Residential 1-4 family | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	598	772
Residential Real Estate | Residential 1-4 family | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	106
Residential Real Estate | Residential 1-4 family | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	59
Residential Real Estate | Residential 1-4 family | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	516	$ 290
Residential Real Estate | Residential 1-4 family | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Residential Real Estate | Residential 1-4 family | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Residential Real Estate | Residential 1-4 family | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	116
Residential Real Estate | Multifamily residential
Financing Receivable, Modifications [Line Items]
Number of loans | contract		1
Restructured loans, amount		$ 1,130
Post modification outstanding balance		969
Residential Real Estate | Multifamily residential | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance		0
Residential Real Estate | Multifamily residential | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance		969
Residential Real Estate | Multifamily residential | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance		$ 0
Total real estate
Financing Receivable, Modifications [Line Items]
Number of loans | contract		27
Restructured loans, amount		$ 7,923
Post modification outstanding balance	$ 20,410	4,782
Percentage of Total Class of Loans Receivable	0.20%
Total real estate | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 958	743
Total real estate | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	598	3,313
Total real estate | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	106
Total real estate | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	1,745
Total real estate | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	864	$ 726
Total real estate | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Total real estate | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	16,023
Total real estate | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	116
Consumer
Financing Receivable, Modifications [Line Items]
Number of loans | contract		2
Restructured loans, amount		$ 18
Post modification outstanding balance	$ 30	12
Percentage of Total Class of Loans Receivable	0.00%
Consumer | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 14	0
Consumer | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0	11
Consumer | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	1
Consumer | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	10
Consumer | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0	$ 1
Consumer | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	5
Consumer | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Consumer | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial & Industrial
Financing Receivable, Modifications [Line Items]
Number of loans | contract		15
Restructured loans, amount		$ 3,199
Post modification outstanding balance	$ 4,170	951
Percentage of Total Class of Loans Receivable	0.18%
Commercial & Industrial | Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 2,253	47
Commercial & Industrial | Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	38	748
Commercial & Industrial | Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	42
Commercial & Industrial | Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	1,763
Commercial & Industrial | Rate and Term Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	74	$ 156
Commercial & Industrial | Principal and Rate Modification
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial & Industrial | Term Extension and Interest Forgiveness
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	0
Commercial & Industrial | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post modification outstanding balance	$ 0

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