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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Allowance for loan losses by portfolio segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses
Beginning balance	$ 50,564	$ 47,706	$ 48,453	$ 47,121
Provision for loan losses	1,000	1,100	2,985	6,100
Loans charged-off	(1,221)	(581)	(1,589)	(5,686)
Recoveries	285	118	779	808
Net loans charged-off/(recovered)	(936)	(463)	(810)	(4,878)
Ending balance	50,628	48,343	50,628	48,343
Commercial and Industrial Loans
Financing Receivable, Allowance for Credit Losses
Beginning balance	25,024	22,524	22,518	21,097
Provision for loan losses	943	952	3,260	6,246
Loans charged-off	(1,123)	(474)	(1,223)	(4,891)
Recoveries	133	69	422	619
Net loans charged-off/(recovered)	(990)	(405)	(801)	(4,272)
Ending balance	24,977	23,071	24,977	23,071
Commercial Real Estate and Multi-family Residential Loans
Financing Receivable, Allowance for Credit Losses
Beginning balance	15,492	14,954	15,393	14,714
Provision for loan losses	474	140	461	855
Loans charged-off	0	0	0	(491)
Recoveries	44	7	156	23
Net loans charged-off/(recovered)	44	7	156	(468)
Ending balance	16,010	15,101	16,010	15,101
Agri-business and Agricultural Loans
Financing Receivable, Allowance for Credit Losses
Beginning balance	3,906	4,585	4,305	4,920
Provision for loan losses	(4)	(506)	(407)	(850)
Loans charged-off	0	0	0	0
Recoveries	2	5	6	14
Net loans charged-off/(recovered)	2	5	6	14
Ending balance	3,904	4,084	3,904	4,084
Other Commercial
Financing Receivable, Allowance for Credit Losses
Beginning balance	355	464	368	577
Provision for loan losses	28	(23)	15	(136)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans charged-off/(recovered)	0	0	0	0
Ending balance	383	441	383	441
Consumer 1-4 Family Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Beginning balance	2,153	1,953	2,292	2,768
Provision for loan losses	(93)	321	(172)	(541)
Loans charged-off	(23)	(24)	(110)	(31)
Recoveries	83	6	110	60
Net loans charged-off/(recovered)	60	(18)	0	29
Ending balance	2,120	2,256	2,120	2,256
Other Consumer
Financing Receivable, Allowance for Credit Losses
Beginning balance	289	266	283	379
Provision for loan losses	67	62	192	78
Loans charged-off	(75)	(83)	(256)	(273)
Recoveries	23	31	85	92
Net loans charged-off/(recovered)	(52)	(52)	(171)	(181)
Ending balance	304	276	304	276
Unallocated
Financing Receivable, Allowance for Credit Losses
Beginning balance	3,345	2,960	3,294	2,666
Provision for loan losses	(415)	154	(364)	448
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans charged-off/(recovered)	0	0	0	0
Ending balance	$ 2,930	$ 3,114	$ 2,930	$ 3,114

X

- Definition

Reflects the amount of loans and leases that have been removed after recoveries, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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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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Amount of expense related to estimated loss from loan and lease transactions.

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