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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) AND CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income (loss) $ (766,000) $ 6,560,000 $ 63,915,000 $ (1,352,000) $ 21,695,000 $ 66,729,000 $ (14,974,000)
Securities available-for-sale              
Unrealized holding losses (gains) arising during the period         2,111,000 (3,100,000) (3,804,000)
Reclassification adjustments for net gains included in net income (loss)         (8,000) (3,227,000) (3,064,000)
Tax effect         (602,000) 2,533,000  
Net of tax         1,501,000 (3,794,000) (6,868,000)
Cash flow hedges              
Unrealized holding gains arising during the period         688,000 3,684,000  
Reclassification adjustments for losses included in net income (loss)         579,000 40,000  
Tax effect         (587,000) (1,491,000)  
Net of tax         680,000 2,233,000  
Beginning balance   382,658,000   188,274,000 382,658,000 188,274,000 209,071,000
Total other comprehensive income (loss)         2,181,000 (1,561,000) (6,868,000)
Ending balance 458,578,000   382,658,000   458,578,000 382,658,000 188,274,000
Comprehensive income (loss)         23,876,000 65,168,000 (21,842,000)
Gains (Losses) on Cash Flow Hedges              
Cash flow hedges              
Beginning balance   2,233,000     2,233,000    
Total other comprehensive income (loss)         680,000 2,233,000  
Ending balance 2,913,000   2,233,000   2,913,000 2,233,000  
Unrealized Gains (Losses) on Available-for-Sale Securities              
Cash flow hedges              
Beginning balance   (9,501,000)   (5,707,000) (9,501,000) (5,707,000) 1,161,000
Total other comprehensive income (loss)         1,501,000 (3,794,000) (6,868,000)
Ending balance (8,000,000)   (9,501,000)   (8,000,000) (9,501,000) (5,707,000)
Total Accumulated Other Comprehensive Income (Loss)              
Cash flow hedges              
Beginning balance   $ (7,268,000)   $ (5,707,000) (7,268,000) (5,707,000) 1,161,000
Total other comprehensive income (loss)         2,181,000 (1,561,000) (6,868,000)
Ending balance $ (5,087,000)   $ (7,268,000)   $ (5,087,000) $ (7,268,000) $ (5,707,000)