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Stockholders' Equity and Regulatory Capital Reconciliation of stockholders' equity to federal regulatory capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Regulatory Capital Requirements [Abstract]        
Stockholders’ equity of the Corporation $ 169,278 $ 161,650 $ 150,832 $ 137,748
Net unrealized and accumulated losses on specific items 1,238 522    
Disallowed servicing assets (848) (652)    
Disallowed goodwill and other intangibles (10,511) (10,560)    
Junior subordinated notes 10,019 10,004    
Tier 1 capital 169,176 160,964    
Allowable general valuation allowances and subordinated debt 45,325 43,153    
Total capital $ 214,501 $ 204,117