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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	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 10,428		$ 10,029
Collectively evaluated for impairment	40,200		38,424
Total ending allowance balance	50,628	$ 50,564	48,453	$ 48,343	$ 47,706	$ 47,121
Loans:
Loans individually evaluated for impairment	28,080		26,717
Loans collectively evaluated for impairment	3,995,141		3,888,028
Total ending loans balance	4,023,221		3,914,745
Commercial and Industrial Loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment	9,231		8,552
Collectively evaluated for impairment	15,746		13,966
Total ending allowance balance	24,977	25,024	22,518	23,071	22,524	21,097
Loans:
Loans individually evaluated for impairment	20,123		19,734
Loans collectively evaluated for impairment	1,412,274		1,385,604
Total ending loans balance	1,432,397		1,405,338
Commercial Real Estate and Multi-family Residential Loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment	702		921
Collectively evaluated for impairment	15,308		14,472
Total ending allowance balance	16,010	15,492	15,393	15,101	14,954	14,714
Loans:
Loans individually evaluated for impairment	4,919		4,266
Loans collectively evaluated for impairment	1,673,467		1,562,899
Total ending loans balance	1,678,386		1,567,165
Agri-business and Agricultural Loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment	90		73
Collectively evaluated for impairment	3,814		4,232
Total ending allowance balance	3,904	3,906	4,305	4,084	4,585	4,920
Loans:
Loans individually evaluated for impairment	430		433
Loans collectively evaluated for impairment	329,642		370,174
Total ending loans balance	330,072		370,607
Other Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	383		368
Total ending allowance balance	383	355	368	441	464	577
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	99,969		95,520
Total ending loans balance	99,969		95,520
Consumer 1-4 Family Mortgage Loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment	405		457
Collectively evaluated for impairment	1,715		1,835
Total ending allowance balance	2,120	2,153	2,292	2,256	1,953	2,768
Loans:
Loans individually evaluated for impairment	2,608		2,240
Loans collectively evaluated for impairment	389,415		388,053
Total ending loans balance	392,023		390,293
Other Consumer
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		26
Collectively evaluated for impairment	304		257
Total ending allowance balance	304	289	283	276	266	379
Loans:
Loans individually evaluated for impairment	0		44
Loans collectively evaluated for impairment	90,374		85,778
Total ending loans balance	90,374		85,822
Unallocated
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	2,930		3,294
Total ending allowance balance	2,930	$ 3,345	3,294	$ 3,114	$ 2,960	$ 2,666
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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