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Accumulated Other Comprehensive Income - AOCI rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in AOCI        
BALANCE - beginning of period     $ 302,310  
Other comprehensive income (loss), net of tax $ (367) $ 570 1,180 $ (1,035)
BALANCE - end of period 329,090   329,090  
Accumulated Comprehensive Income        
Changes in AOCI        
BALANCE - beginning of period     566  
Other comprehensive income (loss) items     1,732  
Reclassifications     (552)  
Other comprehensive income (loss), net of tax     1,180  
BALANCE - end of period 1,746   1,746  
Unrealized (gain) loss on securities | Available for sale securities        
Changes in AOCI        
BALANCE - beginning of period     1,658  
Other comprehensive income (loss) items     1,618  
Reclassifications     3  
Other comprehensive income (loss), net of tax     1,621  
BALANCE - end of period 3,279   3,279  
Unrealized (gain) loss on securities | Held to maturity securities        
Changes in AOCI        
BALANCE - beginning of period     3,154  
Reclassifications     (816)  
Other comprehensive income (loss), net of tax     (816)  
BALANCE - end of period 2,338   2,338  
Unrealized (gain) loss on derivatives        
Changes in AOCI        
BALANCE - beginning of period     (4,246)  
Other comprehensive income (loss) items     114  
Reclassifications     261  
Other comprehensive income (loss), net of tax     375  
BALANCE - end of period $ (3,871)   $ (3,871)