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Securities (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Reclassification of unrealized net gain on equity securities   $ 0    
Equity securities with a readily determinable fair value, cost $ 17,086,000      
Equity securities with a readily determinable fair value, fair value 17,086,000      
Unrealized gain on equity securities, net 212,000 0 $ 0  
Held to maturity securities sold, carrying value     4,400,000  
Loss on held to maturity securities sold   (89,000)    
Gross gain (losses) on sale of available for sale securities 0   0  
FHLB stock 16,600,000 14,000,000    
Mortgage and asset-backed securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Gain on held-to-maturity securities sold     89,000  
Loss on held to maturity securities sold   439,000 439,000  
Gross gain (losses) on sale of available for sale securities   0 (85,000)  
Obligations of states and political subdivisions        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Held to maturity securities sold, carrying value     503,000  
Loss on held to maturity securities sold     $ 1,500  
Collateral Pledged        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Securities pledged as collateral $ 524,800,000      
Retained Earnings        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Reclassification of unrealized net gain on equity securities   $ 280,000    
Accounting Standards Update 2016-01 | Retained Earnings        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Reclassification of unrealized net gain on equity securities       $ 280,000