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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023
Activity in allowance for loan losses
Balance, beginning of year	$ 25,178	$ 21,180	$ 20,151
Impact of adopting ASC 326	28,702	25,178
Provision for credit losses	1,682	4,160	1,090
Charge-offs	(1,105)	(410)	(1,118)
Recoveries	524	248	1,057
Balance, end of year	28,702	25,178
Balance, end of year		25,178	21,180
Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		2,423		$ 2,423
Balance, end of year		2,423
Unallocated
Activity in allowance for loan losses
Balance, beginning of year	245	237	218
Impact of adopting ASC 326	0
Provision for credit losses	0	8	19
Charge-offs	0	0	0
Recoveries	0	0	0
Balance, end of year	0
Balance, end of year		245	237
Unallocated | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		(245)
Balance, end of year		(245)
Commercial
Activity in allowance for loan losses
Balance, beginning of year	21,301	17,943	16,247
Impact of adopting ASC 326	26,077
Provision for credit losses	1,583	3,265	1,661
Charge-offs	(760)	0	(956)
Recoveries	213	93	991
Balance, end of year	26,077
Balance, end of year		21,301	17,943
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		3,740
Balance, end of year		3,740
Commercial | Commercial Real Estate
Activity in allowance for loan losses
Balance, beginning of year	13,558	12,037	11,151
Impact of adopting ASC 326	17,873
Provision for credit losses	1,360	1,489	710
Charge-offs	(12)	0	(293)
Recoveries	110	32	469
Balance, end of year	17,873
Balance, end of year		13,558	12,037
Commercial | Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		2,857
Balance, end of year		2,857
Commercial | Acquisition and Development
Activity in allowance for loan losses
Balance, beginning of year	3,214	2,062	1,114
Impact of adopting ASC 326	2,241
Provision for credit losses	(764)	1,142	938
Charge-offs	0	0	0
Recoveries	5	10	10
Balance, end of year	2,241
Balance, end of year		3,214	2,062
Commercial | Acquisition and Development | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		(214)
Balance, end of year		(214)
Commercial | Commercial and Industrial
Activity in allowance for loan losses
Balance, beginning of year	4,505	3,814	3,942
Impact of adopting ASC 326	8
Provision for credit losses	1,023	640	23
Charge-offs	(748)	0	(663)
Recoveries	98	51	512
Balance, end of year	8
Balance, end of year		4,505	3,814
Commercial | Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		928
Balance, end of year		928
Commercial | Municipal
Activity in allowance for loan losses
Balance, beginning of year	24	30	40
Impact of adopting ASC 326	157
Provision for credit losses	(36)	(6)	(10)
Charge-offs	0	0	0
Recoveries	0	0	0
Balance, end of year	157
Balance, end of year		24	30
Commercial | Municipal | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		169
Balance, end of year		169
Consumer
Activity in allowance for loan losses
Balance, beginning of year	3,632	3,000	3,686
Impact of adopting ASC 326	2,625
Provision for credit losses	99	887	(590)
Charge-offs	(345)	(410)	(162)
Recoveries	311	155	66
Balance, end of year	2,625
Balance, end of year		3,632	3,000
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		(1,072)
Balance, end of year		(1,072)
Consumer | Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of year	3,444	2,785	3,362
Impact of adopting ASC 326	2,424
Provision for credit losses	6	669	(517)
Charge-offs	(98)	(50)	(92)
Recoveries	193	40	32
Balance, end of year	2,424
Balance, end of year		3,444	2,785
Consumer | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		(1,121)
Balance, end of year		(1,121)
Consumer | Installment and Other
Activity in allowance for loan losses
Balance, beginning of year	188	215	324
Impact of adopting ASC 326	201
Provision for credit losses	93	218	(73)
Charge-offs	(247)	(360)	(70)
Recoveries	118	115	34
Balance, end of year	$ 201
Balance, end of year		188	$ 215
Consumer | Installment and Other | Cumulative Effect, Period of Adoption, Adjustment
Activity in allowance for loan losses
Impact of adopting ASC 326		49
Balance, end of year		$ 49

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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