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LOANS (Total Loans Outstanding) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 100.00% | 100.00% |  |
Total Commercial And Consumer Loans | $ 3,940,652 | $ 3,916,326 |  |
Less: Allowance for loan losses | (49,562) | (48,453) | $ (45,627) | $ (47,121)
Net deferred loan fees | (1,642) | (1,581) |  |
Loans, net | $ 3,889,448 | $ 3,866,292 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 88.10% | 87.90% |  |
Total Commercial And Consumer Loans | $ 3,471,292 | $ 3,441,184 |  |
Multifamily Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Commercial And Consumer Loans | $ 240,939 | $ 195,604 |  |
Other consumer loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 2.10% | 2.20% |  |
Total Commercial And Consumer Loans | $ 84,650 | $ 86,064 |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 11.90% | 12.10% |  |
Total Commercial And Consumer Loans | $ 469,360 | $ 475,142 |  |
Commercial and Industrial Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less: Allowance for loan losses | $ (24,030) | $ (22,518) | (20,725) | (21,097)
Commercial and Industrial Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 36.20% | 35.90% |  |
Total Commercial And Consumer Loans | $ 1,427,342 | $ 1,405,379 |  |
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 18.40% | 17.60% |  |
Total Commercial And Consumer Loans | $ 726,895 | $ 690,620 |  |
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 17.80% | 18.30% |  |
Total Commercial And Consumer Loans | $ 700,447 | $ 714,759 |  |
Commercial Real Estate and Multi-family Residential Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 41.40% | 40.10% |  |
Total Commercial And Consumer Loans | $ 1,629,622 | $ 1,569,635 |  |
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 7.50% | 6.80% |  |
Total Commercial And Consumer Loans | $ 293,818 | $ 266,805 |  |
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 14.10% | 15.00% |  |
Total Commercial And Consumer Loans | $ 557,296 | $ 586,325 |  |
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 13.70% | 13.30% |  |
Total Commercial And Consumer Loans | $ 537,569 | $ 520,901 |  |
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 6.10% | 5.00% |  |
Agri-business and Agricultural Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less: Allowance for loan losses | $ (4,146) | $ (4,305) | $ (4,848) | $ (4,920)
Agri-business and Agricultural Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 7.70% | 9.50% |  |
Total Commercial And Consumer Loans | $ 302,307 | $ 370,513 |  |
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 3.60% | 4.60% |  |
Total Commercial And Consumer Loans | $ 139,645 | $ 177,503 |  |
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 4.10% | 4.90% |  |
Total Commercial And Consumer Loans | $ 162,662 | $ 193,010 |  |
Other Commercial Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 2.80% | 2.40% |  |
Total Commercial And Consumer Loans | $ 112,021 | $ 95,657 |  |
Total Consumer 1 To 4 Family Mortgage Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 9.80% | 9.90% |  |
Total Commercial And Consumer Loans | $ 384,710 | $ 389,078 |  |
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 4.80% | 4.70% |  |
Total Commercial And Consumer Loans | $ 188,777 | $ 185,822 |  |
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 4.70% | 4.80% |  |
Total Commercial And Consumer Loans | $ 182,791 | $ 187,030 |  |
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of Total commercial loans | 0.30% | 0.40% |  |
Total Commercial And Consumer Loans | $ 13,142 | $ 16,226 |  |

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