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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Aging Of The Recorded Investment In Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | $ 4,003,052 | $ 3,897,455
30 to 89 Days Past Due | 1,204 | 10,025
Nonaccrual | 18,658 | 7,265
Total Past Due and Nonaccural | 20,169 | 17,290
Total | 4,023,221 | 3,914,745
Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 307 | 0
Other Commercial Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 99,969 | 95,520
30 to 89 Days Past Due | 0 | 0
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 0 | 0
Total | 99,969 | 95,520
Other Commercial Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Other consumer loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 90,236 | 85,654
30 to 89 Days Past Due | 138 | 168
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 138 | 168
Total | 90,374 | 85,822
Other consumer loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial and Industrial Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 1,432,397 | 1,405,338
Commercial and Industrial Loans | Working Capital Lines of Credit Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 724,404 | 684,191
30 to 89 Days Past Due | 0 | 4,328
Nonaccrual | 6,309 | 2,245
Total Past Due and Nonaccural | 6,309 | 6,573
Total | 730,713 | 690,764
Commercial and Industrial Loans | Working Capital Lines of Credit Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial and Industrial Loans | Non-working Capital Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 695,127 | 709,629
30 to 89 Days Past Due | 42 | 3,368
Nonaccrual | 6,515 | 1,577
Total Past Due and Nonaccural | 6,557 | 4,945
Total | 701,684 | 714,574
Commercial and Industrial Loans | Non-working Capital Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial Real Estate and Multi-family Residential Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 1,678,386 | 1,567,165
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 318,369 | 265,544
30 to 89 Days Past Due | 0 | 0
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 0 | 0
Total | 318,369 | 265,544
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 552,276 | 583,214
30 to 89 Days Past Due | 0 | 486
Nonaccrual | 3,952 | 2,269
Total Past Due and Nonaccural | 3,952 | 2,755
Total | 556,228 | 585,969
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 544,778 | 520,431
30 to 89 Days Past Due | 0 | 57
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 0 | 57
Total | 544,778 | 520,488
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 259,011 | 195,164
30 to 89 Days Past Due | 0 | 0
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 0 | 0
Total | 259,011 | 195,164
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total |  | 585,969
Agri-business and Agricultural Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 330,072 | 370,607
Agri-business and Agricultural Loans | Loans Secured By Farmland |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 175,604 | 177,080
30 to 89 Days Past Due | 6 | 150
Nonaccrual | 430 | 283
Total Past Due and Nonaccural | 436 | 433
Total | 176,040 | 177,513
Agri-business and Agricultural Loans | Loans Secured By Farmland | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Agri-business and Agricultural Loans | Loans For Agricultural Production |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 154,017 | 193,094
30 to 89 Days Past Due | 15 | 0
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 15 | 0
Total | 154,032 | 193,094
Agri-business and Agricultural Loans | Loans For Agricultural Production | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Agri-business and Agricultural Loans | Other Commercial Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 99,969 | 95,520
Consumer 1-4 Family Mortgage Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 392,023 | 390,293
Consumer 1-4 Family Mortgage Loans | Other Commercial Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 90,374 | 85,822
Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 185,219 | 183,420
30 to 89 Days Past Due | 850 | 1,370
Nonaccrual | 675 | 671
Total Past Due and Nonaccural | 1,832 | 2,041
Total | 187,051 | 185,461
Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 307 | 0
Consumer 1-4 Family Mortgage Loans | Home Equity Mortgage Open Ended Revolving Lines |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 192,365 | 188,320
30 to 89 Days Past Due | 101 | 98
Nonaccrual | 777 | 220
Total Past Due and Nonaccural | 878 | 318
Total | 193,243 | 188,638
Consumer 1-4 Family Mortgage Loans | Home Equity Mortgage Open Ended Revolving Lines | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 0 | 0
Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Loans Not Past Due | 11,677 | 16,194
30 to 89 Days Past Due | 52 | 0
Nonaccrual | 0 | 0
Total Past Due and Nonaccural | 52 | 0
Total | 11,729 | 16,194
Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans | Greater than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | $ 0 | $ 0

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