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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,577,306	$ 2,490,227
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,828,136	1,630,897
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	749,170	859,330
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	923,773	826,699
Total commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	701,687	579,734
Total commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	222,086	246,965
Total commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	30,866	26,644
Total commercial real estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	28,802	23,754
Total commercial real estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,064	2,890
Total commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	892,907	800,055
Total commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	672,885	555,980
Total commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	220,022	244,075
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	402,706	404,870
Total commercial and industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	327,143	313,662
Total commercial and industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	75,563	91,208
Total commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	280,384	287,227
Total commercial and industrial | Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	239,894	234,757
Total commercial and industrial | Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	40,490	52,470
Total commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,206	22,317
Total commercial and industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,206	22,317
Total commercial and industrial | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Total commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	101,116	95,326
Total commercial and industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	66,043	56,588
Total commercial and industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	35,073	38,738
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,326,479	1,231,569
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,028,830	893,396
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	297,649	338,173
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,143,452	1,144,698
Total residential real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	730,516	670,189
Total residential real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	412,936	474,509
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,143,452	1,144,698
Total residential real estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	730,516	670,189
Total residential real estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	412,936	474,509
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	107,375	113,960
Total consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	68,790	67,312
Total consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	38,585	46,648
Total consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	96,156	103,189
Total consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	58,556	57,898
Total consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	37,600	45,291
Total consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,219	10,771
Total consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	10,234	9,414
Total consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 985	$ 1,357

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=118952595&loc=d3e4428-111522

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