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Investment Securities - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
security
state
Dec. 31, 2017
USD ($)
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Number of securities temporarily impaired (security) | security 511 241  
Number of securities temporarily impaired for 12 months or more (security) | security 232 157  
Period of temporary impairment 12 months 12 months  
Amortized cost of securities transferred     $ 89,780,000
Fair value of securities transferred     89,757,000
Net unrealized losses on securities transferred     $ 15,000
Net unrealized loss on securities transferred from available for sale to held to maturity $ 197,000 $ 174,000  
Number of states | state 6    
Federal Home Loan Bank Stock $ 10,549,000 9,321,000  
Impairment losses 0    
Other equity securities      
Debt Securities, Available-for-sale [Line Items]      
Securities pledged as collateral $ 222,829,000 $ 231,516,000