LOANS AND LEASES - Nonaccrual Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Document Period End Date			Sep. 30, 2020
Financing Receivable, Nonaccrual, No Allowance	$ 55,810		$ 55,810
Average current balance		$ 83,960		$ 84,250
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		7		124
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		513		1,428
Nonaccrual loans	77,930		77,930		$ 48,165
Financing Receivable, Nonaccrual, With Allowance	22,120		22,120
Accruing trouble debt restructurings	7,800		7,800		11,400
Total impaired loans					59,600
Restructured loans - nonaccrual status	29,300		29,300		18,500
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,552	1,568	4,185	4,648
Interest included in income
Nonaccrual loans	689	336	1,226	863
Troubled debt restructurings	64	184	367	689
Total interest included in income	753	520	1,593	1,552
Net impact on interest income	799	1,048	2,592	3,096
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	14,128		14,128
Average current balance		42,151		38,839
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		1		87
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		316		807
Nonaccrual loans	34,686		34,686		24,346
Financing Receivable, Nonaccrual, With Allowance	20,558		20,558
Total impaired loans					27,480
Interest included in income
Total interest included in income		317		894
Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	1,092		1,092
Average current balance		290		226
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0
Nonaccrual loans	1,092		1,092		223
Financing Receivable, Nonaccrual, With Allowance	0		0
Total impaired loans					223
Interest included in income
Total interest included in income		0		0
Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	0		0
Average current balance		6		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0
Nonaccrual loans	0		0		0
Financing Receivable, Nonaccrual, With Allowance	0		0
Total impaired loans					0
Interest included in income
Total interest included in income		0		0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	23,211		23,211
Average current balance		19,713		22,414
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		4		27
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		94		295
Nonaccrual loans	24,521		24,521		7,295
Financing Receivable, Nonaccrual, With Allowance	1,310		1,310
Total impaired loans					10,831
Interest included in income
Total interest included in income		98		322
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	11,852		11,852
Average current balance		16,056		16,661
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2		10
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		74		229
Nonaccrual loans	12,104		12,104		10,892
Financing Receivable, Nonaccrual, With Allowance	252		252
Total impaired loans					15,162
Interest included in income
Total interest included in income		76		239
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	5,374		5,374
Average current balance		5,594		5,941
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		29		95
Nonaccrual loans	5,374		5,374		5,242
Financing Receivable, Nonaccrual, With Allowance	0		0
Total impaired loans					5,700
Interest included in income
Total interest included in income		29		95
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, No Allowance	153		153
Average current balance		150		162
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		2
Nonaccrual loans	153		153		167
Financing Receivable, Nonaccrual, With Allowance	0		0
Total impaired loans					204
Interest included in income
Total interest included in income		0		2
Loans with no related allowance recorded [member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		77,824		78,975
Total impaired loans					47,881
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		37,835		35,626
Total impaired loans					16,726
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		148		155
Total impaired loans					223
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		6		7
Total impaired loans					0
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		18,703		20,907
Total impaired loans					10,160
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		15,388		16,177
Total impaired loans					14,868
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		5,594		5,941
Total impaired loans					5,700
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		150		162
Total impaired loans					204
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total impaired loans	24,178		24,178
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		4,316		3,213
Total impaired loans	21,632		21,632		10,754
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		142		71
Total impaired loans					0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		0		0
Total impaired loans					0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		1,010		1,507
Total impaired loans					671
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		668		484
Total impaired loans	$ 1,235		$ 1,235		294
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		0		0
Total impaired loans					0
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		0		0
Total impaired loans					0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance		$ 6,136		$ 5,275
Total impaired loans					$ 11,719