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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | $ 10,257 | $ (8,776) | $ 10,805
Less: reclassification adjustment for (losses) gains realized in net income | 2,814 | (1,108) | 4,831
Total other comprehensive income (loss), before tax | 21,333 | (16,086) | 25,206
Total income tax (expense) benefit related to other comprehensive income (loss) | (8,262) | 6,202 | (9,570)
Total other comprehensive income (loss) | 13,071 | (9,884) | 15,636
Net unrealized holding gain on AFS securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, before tax | 18,309 | (7,567) | 25,769
Other comprehensive income (loss) before reclassifications, tax | (6,979) | 2,793 | (9,791)
Other comprehensive income (loss), before reclassifications, net of tax | 11,330 | (4,774) | 15,978
Less: reclassification from accumulated other comprehensive income, current period, before tax | 551 | (2,110) | (482)
Less: reclassification adjustment for (losses) gains realized in net income | (220) | 847 | 196
Less: reclassification adjustment for (losses) gains realized in net income | 331 | (1,263) | (286)
Total other comprehensive income (loss), before tax | 18,860 | (9,677) | 25,287
Total income tax (expense) benefit related to other comprehensive income (loss) | (7,199) | 3,640 | (9,595)
Total other comprehensive income (loss) | 11,661 | (6,037) | 15,692
Net (loss) on effective cash flow hedging derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, before tax | (2,023) | (5,232) | (6,403)
Other comprehensive income (loss) before reclassifications, tax | 754 | 2,094 | 2,608
Other comprehensive income (loss), before reclassifications, net of tax | (1,269) | (3,138) | (3,795)
Less: reclassification from accumulated other comprehensive income, current period, before tax | 3,981 | 0 | 5,393
Less: reclassification adjustment for (losses) gains realized in net income | (1,589) | 0 | (2,201)
Less: reclassification adjustment for (losses) gains realized in net income | 2,392 | 0 | 3,192
Total other comprehensive income (loss), before tax | 1,958 | (5,232) | (1,010)
Total income tax (expense) benefit related to other comprehensive income (loss) | (835) | 2,094 | 407
Total other comprehensive income (loss) | 1,123 | (3,138) | (603)
Net loss on terminated swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, before tax |  |  | 0
Other comprehensive income (loss) before reclassifications, tax |  |  | 0
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 0 | 0
Less: reclassification from accumulated other comprehensive income, current period, before tax |  |  | 3,237
Less: reclassification adjustment for (losses) gains realized in net income |  |  | (1,312)
Less: reclassification adjustment for (losses) gains realized in net income | 0 | 0 | 1,925
Total other comprehensive income (loss), before tax |  |  | 3,237
Total income tax (expense) benefit related to other comprehensive income (loss) |  |  | (1,312)
Total other comprehensive income (loss) | 0 | 0 | 1,925
Net unrealized holding (loss) on pension plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, before tax | 351 | (1,436) | (2,308)
Other comprehensive income (loss) before reclassifications, tax | (155) | 572 | 930
Other comprehensive income (loss), before reclassifications, net of tax | 196 | (864) | (1,378)
Less: reclassification from accumulated other comprehensive income, current period, before tax | 164 | 259 | 0
Less: reclassification adjustment for (losses) gains realized in net income | (73) | (104) | 0
Less: reclassification adjustment for (losses) gains realized in net income | 91 | 155 | 0
Total other comprehensive income (loss), before tax | 515 | (1,177) | (2,308)
Total income tax (expense) benefit related to other comprehensive income (loss) | (228) | 468 | 930
Total other comprehensive income (loss) | $ 287 | $ (709) | $ (1,378)

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