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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Balance In The Allowance For Loan Losses And The Recorded Investment In Loans By Portfolio Management (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 8,177		$ 10,384
Collectively evaluated for impairment	50,842		40,268
Total ending allowance balance	59,019	$ 53,609	50,652	$ 50,564	$ 49,562	$ 48,453
Loans:
Loans individually evaluated for impairment	24,008		27,829
Loans collectively evaluated for impairment	4,466,524		4,037,999
Total ending loans balance	4,490,532		4,065,828
Commercial and Industrial Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	6,384		9,324
Collectively evaluated for impairment	20,360		16,465
Total ending allowance balance	26,744	24,739	25,789	25,024	24,030	22,518
Loans:
Loans individually evaluated for impairment	14,870		19,580
Loans collectively evaluated for impairment	1,778,929		1,407,246
Total ending loans balance	1,793,799		1,426,826
Commercial Real Estate and Multi-family Residential Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,318		538
Collectively evaluated for impairment	19,745		15,258
Total ending allowance balance	21,063	18,658	15,796	15,492	15,447	15,393
Loans:
Loans individually evaluated for impairment	6,093		4,998
Loans collectively evaluated for impairment	1,772,848		1,665,842
Total ending loans balance	1,778,941		1,670,840
Agri-business and Agricultural Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	64		90
Collectively evaluated for impairment	3,344		3,779
Total ending allowance balance	3,408	3,704	3,869	3,906	4,146	4,305
Loans:
Loans individually evaluated for impairment	430		445
Loans collectively evaluated for impairment	351,641		379,186
Total ending loans balance	352,071		379,631
Other Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	542		447
Total ending allowance balance	542	521	447	355	373	368
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	110,712		112,166
Total ending loans balance	110,712		112,166
Consumer 14 family mortgage loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment	411		426
Collectively evaluated for impairment	3,023		1,660
Total ending allowance balance	3,434	2,475	2,086	2,153	2,266	2,292
Loans:
Loans individually evaluated for impairment	2,615		2,789
Loans collectively evaluated for impairment	353,963		375,210
Total ending loans balance	356,578		377,999
Other Consumer
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		6
Collectively evaluated for impairment	774		339
Total ending allowance balance	774	447	345	289	291	283
Loans:
Loans individually evaluated for impairment	0		17
Loans collectively evaluated for impairment	98,431		98,349
Total ending loans balance	98,431		98,366
Unallocated
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,054		2,320
Total ending allowance balance	3,054	$ 3,065	2,320	$ 3,345	$ 3,009	$ 3,294
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	0		0
Total ending loans balance	$ 0		$ 0

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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