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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 11,905,000 $ 14,909,000 $ 16,514,000
Other comprehensive loss, before tax      
Unrealized securities losses arising during the period (1,156,000) (902,000) (719,000)
Reclassification adjustment for net loss (gain) realized in net income 403,000 (10,000) 0
Amortization of net unrealized losses transferred from available-for-sale 102,000 159,000 233,000
Unrealized losses on interest rate swaps arising during the period (122,000) 0 0
Income tax benefit 279,000 311,000 188,000
Total other comprehensive loss (494,000) (442,000) (298,000)
Comprehensive income $ 11,411,000 $ 14,467,000 $ 16,216,000