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Securities (Details Textual) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Trading $ 1,900   $ 1,500
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) 0 $ 0  
Debt Securities, Available-for-sale 393,148   442,752
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 0   0
Securities (Textual) [Abstract]      
Callable Securities in Investment Portfolio 18,100    
Pledged Financial Instruments, Not Separately Reported, Securities 355,000   361,100
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity 0   0
Equity Securities, FV-NI $ 20,807   $ 19,477