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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment
Total ending loans balance	$ 4,474,631	$ 4,649,156
Commercial and industrial loans
Financing Receivable, Recorded Investment
Total ending loans balance		1,784,926
Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	574,696	626,099
Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	1,093,471	1,158,827
Commercial real estate and multi-family residential loans
Financing Receivable, Recorded Investment
Total ending loans balance		1,892,572
Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	369,633	361,664
Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	668,934	647,574
Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	605,036	579,050
Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	300,996	304,284
Agri-business and agricultural loans
Financing Receivable, Recorded Investment
Total ending loans balance		429,662
Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	154,786	195,363
Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	192,412	234,299
Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		93,912
Consumer 1-4 family loans
Financing Receivable, Recorded Investment
Total ending loans balance		344,699
Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	161,240	167,501
Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	159,034	165,236
Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	9,179	11,962
Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		103,385
Pass
Financing Receivable, Recorded Investment
Total ending loans balance		3,997,245
Pass | Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	498,780	535,071
Pass | Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	1,043,276	1,111,989
Pass | Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	369,633	361,664
Pass | Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	630,739	608,845
Pass | Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	573,857	547,790
Pass | Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	278,744	282,031
Pass | Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	144,177	183,983
Pass | Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	145,370	185,875
Pass | Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		93,912
Pass | Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	49,672	40,682
Pass | Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	11,502	8,424
Pass | Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Pass | Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		36,979
Special Mention
Financing Receivable, Recorded Investment
Total ending loans balance		251,891
Special Mention | Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	59,011	81,095
Special Mention | Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	22,728	26,523
Special Mention | Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	30,563	31,355
Special Mention | Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	31,179	31,260
Special Mention | Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	22,252	22,253
Special Mention | Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	9,961	10,728
Special Mention | Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	47,042	48,424
Special Mention | Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		0
Special Mention | Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		253
Substandard
Financing Receivable, Recorded Investment
Total ending loans balance		34,264
Substandard | Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	16,905	9,718
Substandard | Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	21,638	14,820
Substandard | Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	7,632	7,374
Substandard | Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	648	652
Substandard | Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		0
Substandard | Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	1,495	1,695
Substandard | Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	5
Substandard | Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		0
Doubtful
Financing Receivable, Recorded Investment
Total ending loans balance		0
Doubtful | Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		0
Doubtful | Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		0
Not Rated
Financing Receivable, Recorded Investment
Total ending loans balance		365,756
Not Rated | Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	215
Not Rated | Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment
Total ending loans balance	5,829	5,495
Not Rated | Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment
Total ending loans balance		0
Not Rated | Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	110,073	125,124
Not Rated | Consumer 1-4 family loans | Open end and junior lien loans
Financing Receivable, Recorded Investment
Total ending loans balance	147,532	156,807
Not Rated | Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment
Total ending loans balance	$ 9,179	11,962
Not Rated | Consumer 1-4 family loans | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance		$ 66,153

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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