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Stockholders' Equity and Regulatory Capital Reconciliation of stockholders' equity to federal regulatory capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Regulatory Capital Requirements [Abstract]        
Stockholders’ equity of the Corporation $ 161,650 $ 150,832 $ 137,748 $ 109,275
Net unrealized and accumulated losses on specific items 522 80    
Disallowed servicing assets (652) (370)    
Disallowed goodwill and other intangibles (10,560) (10,622)    
Junior subordinated notes 10,004 10,000    
Tier 1 capital 160,964 149,920    
Allowable general valuation allowances and subordinated debt 43,153 39,243    
Total capital $ 204,117 $ 189,163