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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest expense (income) | $ 16,725 | $ 18,941 | $ 14,555 | $ 15,630 | $ 12,248 | $ 12,698 | $ 16,780 | $ 12,562 | $ 65,851 | $ 54,288 | $ 47,770
Interest income | 59,158 | 57,971 | 57,441 | 57,697 | 58,748 | 56,971 | 52,637 | 45,493 | 232,267 | 213,849 | 178,691
Income tax expense | (362) | (6,953) | (5,249) | (6,220) | (2,273) | (1,350) | (1,144) | (297) | (18,784) | (5,064) | (11,763)
Net income | $ 10,331 | $ 16,381 | $ 15,957 | $ 16,001 | $ 16,013 | $ 14,701 | $ 10,044 | $ 8,759 | 58,670 | 49,518 | 33,744
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 2,632 | (1,108) | 4,831
Realized (gains) on AFS securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest expense (income) |  |  |  |  |  |  |  |  | (551) | 2,110 | 482
Income tax expense |  |  |  |  |  |  |  |  | 220 | (847) | (196)
Net income |  |  |  |  |  |  |  |  | (331) | 1,263 | 286
Realized losses on cash flow hedging derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | (3,981) | 0 | (5,393)
Income tax expense |  |  |  |  |  |  |  |  | 1,589 | 0 | 2,201
Net income |  |  |  |  |  |  |  |  | (2,392) | 0 | (3,192)
Net loss on terminated swap | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | (3,237)
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 1,312
Net income |  |  |  |  |  |  |  |  | 0 | 0 | (1,925)
Realized (losses) on pension plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest expense (income) |  |  |  |  |  |  |  |  | (164) | 259 | 0
Income tax expense |  |  |  |  |  |  |  |  | 73 | (104) | 0
Net income |  |  |  |  |  |  |  |  | $ (91) | $ 155 | $ 0

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