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FAIR VALUE - GAINS AND LOSSES (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Option              
Aggregate fair value of mortgage loan $ 6,057 $ 12,280 $ 6,057 $ 11,662 $ 5,193 $ 7,148 $ 4,083
Aggregate fair value of consumer loan 3,235 6,826 3,235 2,198 $ 3,679 $ 415  
Contractual balance $ 3,920,955   $ 3,920,955 $ 3,816,086      
Mortgage loans held for sale              
Fair Value, Option              
Number of loans past due 90 days or more or on nonaccrual | loan 0   0 0      
Aggregate fair value of mortgage loan $ 6,057   $ 6,057 $ 11,662      
Contractual balance 5,852   5,852 11,568      
Unrealized gain 205   205 94      
Gains (losses) from changes in fair value included in earnings 204 79 264 170      
Mortgage loans held for sale | Interest Income              
Fair Value, Option              
Gains (losses) from changes in fair value included in earnings 86 40 153 72      
Mortgage loans held for sale | Change In Fair Value              
Fair Value, Option              
Gains (losses) from changes in fair value included in earnings $ 118 $ 39 $ 111 98      
Consumer Loans Held For Sale              
Fair Value, Option              
Consumer loans held for sale period     21 days        
Number of loans past due 90 days or more or on nonaccrual | loan 0 0 0        
Aggregate fair value of consumer loan $ 3,235   $ 3,235 2,198      
Contractual balance 3,063   3,063 2,084      
Unrealized gain 172   172 114      
Gains (losses) from changes in fair value included in earnings 298 $ 523 566 523      
Consumer Loans Held For Sale | Interest Income              
Fair Value, Option              
Gains (losses) from changes in fair value included in earnings 322 161 508 161      
Consumer Loans Held For Sale | Change In Fair Value              
Fair Value, Option              
Gains (losses) from changes in fair value included in earnings $ (24) $ 362 $ 58 $ 362