LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Rating (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) grade	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Loans by risk rating
Number of grades utilized in internal loan rating system | grade	10
Year one, originated current fiscal year	$ 108,731		$ 1,411,554
Year two, originated fiscal year before current fiscal year	1,426,200		1,135,920
Year three, originated two years before current fiscal year	1,131,959		549,182
Year four, originated three years before current fiscal year	537,450		358,789
Year five, originated four years before current fiscal year	350,215		214,183
Prior	838,186		645,253
Revolving Loans Amortized Cost	228,350		233,182
Revolving Loans Converted to Term Loans	1,541		1,607
Total loans	4,622,632		4,549,670
YTD gross charge-offs, originated two years before current fiscal year	4
YTD gross charge-offs, originated three years before current fiscal year	2
YTD gross charge-offs, prior	8
YTD gross charge-offs	14	$ 2,846
Commercial
Loans by risk rating
Total loans	2,922,452		2,873,930
Commercial | Commercial real estate
Loans by risk rating
Year one, originated current fiscal year	45,371		817,320
Year two, originated fiscal year before current fiscal year	821,301		441,277
Year three, originated two years before current fiscal year	436,339		241,700
Year four, originated three years before current fiscal year	241,298		263,549
Year five, originated four years before current fiscal year	265,246		143,825
Prior	477,172		342,673
Total loans	2,286,727		2,250,344
YTD gross charge-offs		2,786
Commercial | Commercial real estate | Pass
Loans by risk rating
Year one, originated current fiscal year	45,371		817,320
Year two, originated fiscal year before current fiscal year	821,301		441,277
Year three, originated two years before current fiscal year	436,339		241,700
Year four, originated three years before current fiscal year	241,298		254,221
Year five, originated four years before current fiscal year	256,002		121,351
Prior	452,739		340,634
Total loans	2,253,050		2,216,503
Commercial | Commercial real estate | Special mention
Loans by risk rating
Year four, originated three years before current fiscal year			9,328
Year five, originated four years before current fiscal year	9,244		22,474
Prior	22,378
Total loans	31,622		31,802
Commercial | Commercial real estate | Substandard
Loans by risk rating
Prior	2,055		2,039
Total loans	2,055		2,039
Commercial | Commercial construction
Loans by risk rating
Year one, originated current fiscal year	666		88,173
Year two, originated fiscal year before current fiscal year	105,325		87,569
Year three, originated two years before current fiscal year	92,024		11,769
Year four, originated three years before current fiscal year	4,316		9,174
Year five, originated four years before current fiscal year	7,894		318
Prior	1,791		1,487
Revolving Loans Amortized Cost	673		821
Total loans	212,689		199,311
Commercial | Commercial construction | Pass
Loans by risk rating
Year one, originated current fiscal year	666		88,173
Year two, originated fiscal year before current fiscal year	105,325		87,569
Year three, originated two years before current fiscal year	92,024		11,769
Year four, originated three years before current fiscal year	4,316		9,174
Year five, originated four years before current fiscal year	7,894		318
Prior	1,791		1,487
Revolving Loans Amortized Cost	673		821
Total loans	212,689		199,311
Commercial | Commercial and industrial
Loans by risk rating
Year one, originated current fiscal year	8,176		53,078
Year two, originated fiscal year before current fiscal year	52,621		95,604
Year three, originated two years before current fiscal year	97,915		82,173
Year four, originated three years before current fiscal year	79,908		26,568
Year five, originated four years before current fiscal year	25,589		37,408
Prior	86,481		52,255
Revolving Loans Amortized Cost	72,346		77,189
Total loans	423,036		424,275
YTD gross charge-offs, originated two years before current fiscal year	4
YTD gross charge-offs, originated three years before current fiscal year	2
YTD gross charge-offs, prior	1
YTD gross charge-offs	7	40
Commercial | Commercial and industrial | Pass
Loans by risk rating
Year one, originated current fiscal year	8,176		53,078
Year two, originated fiscal year before current fiscal year	52,576		95,600
Year three, originated two years before current fiscal year	97,885		82,170
Year four, originated three years before current fiscal year	79,908		26,568
Year five, originated four years before current fiscal year	25,586		37,358
Prior	84,011		50,500
Revolving Loans Amortized Cost	72,296		76,647
Total loans	420,438		421,921
Commercial | Commercial and industrial | Special mention
Loans by risk rating
Year two, originated fiscal year before current fiscal year	24
Year five, originated four years before current fiscal year	3		49
Prior	827		92
Revolving Loans Amortized Cost			492
Total loans	854		633
Commercial | Commercial and industrial | Substandard
Loans by risk rating
Year two, originated fiscal year before current fiscal year	21		4
Year three, originated two years before current fiscal year	30		3
Year five, originated four years before current fiscal year			1
Prior	315		323
Total loans	366		331
Commercial | Commercial and industrial | Doubtful
Loans by risk rating
Prior	1,328		1,340
Revolving Loans Amortized Cost	50		50
Total loans	1,378		1,390
Residential
Loans by risk rating
Year one, originated current fiscal year	50,250		443,034
Year two, originated fiscal year before current fiscal year	439,597		507,882
Year three, originated two years before current fiscal year	502,471		211,569
Year four, originated three years before current fiscal year	210,214		42,515
Year five, originated four years before current fiscal year	41,918		26,490
Prior	267,632		247,088
Revolving Loans Amortized Cost	154,311		154,134
Revolving Loans Converted to Term Loans	1,541		1,607
Total loans	1,667,934		1,634,319
Residential | Accrual
Loans by risk rating
Year one, originated current fiscal year	50,250		443,034
Year two, originated fiscal year before current fiscal year	439,597		507,679
Year three, originated two years before current fiscal year	502,268		211,429
Year four, originated three years before current fiscal year	210,080		42,314
Year five, originated four years before current fiscal year	41,397		25,232
Prior	260,265		239,677
Revolving Loans Amortized Cost	154,191		154,038
Revolving Loans Converted to Term Loans	1,507		1,568
Total loans	1,659,555		1,624,971
Residential | Nonaccrual
Loans by risk rating
Year two, originated fiscal year before current fiscal year			203
Year three, originated two years before current fiscal year	203		140
Year four, originated three years before current fiscal year	134		201
Year five, originated four years before current fiscal year	521		1,258
Prior	7,367		7,411
Revolving Loans Amortized Cost	120		96
Revolving Loans Converted to Term Loans	34		39
Total loans	8,379		9,348
Consumer loans
Loans by risk rating
Year one, originated current fiscal year	4,268		9,949
Year two, originated fiscal year before current fiscal year	7,356		3,588
Year three, originated two years before current fiscal year	3,210		1,971
Year four, originated three years before current fiscal year	1,714		16,983
Year five, originated four years before current fiscal year	9,568		6,142
Prior	5,110		1,750
Revolving Loans Amortized Cost	1,020		1,038
Total loans	32,246		41,421
YTD gross charge-offs, prior	7
YTD gross charge-offs	7	$ 20
Consumer loans | Accrual
Loans by risk rating
Year one, originated current fiscal year	4,268		9,948
Year two, originated fiscal year before current fiscal year	7,356		3,588
Year three, originated two years before current fiscal year	3,210		1,971
Year four, originated three years before current fiscal year	1,714		16,955
Year five, originated four years before current fiscal year	9,514		6,122
Prior	5,093		1,733
Revolving Loans Amortized Cost	1,015		1,034
Total loans	32,170		41,351
Consumer loans | Nonaccrual
Loans by risk rating
Year one, originated current fiscal year			1
Year four, originated three years before current fiscal year			28
Year five, originated four years before current fiscal year	54		20
Prior	17		17
Revolving Loans Amortized Cost	5		4
Total loans	$ 76		$ 70