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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]      
Other Investments and Securities, at Cost     $ 7,800
Cumulative Effect on Retained Earnings, Net of Tax   $ 3,100  
Other comprehensive income (loss), net of tax $ 0 5,020  
Assets      
Available-for-sale investment securities at amortized cost 819,431 819,431 797,732
Held-to-maturity investment securities at fair value $ 37,095 $ 37,095 $ 41,213
Stockholders’ equity      
Preferred stock - shares authorized 50,000 50,000 50,000
Preferred stock - shares issued 0 0 0
Common stock - shares authorized 24,000,000 24,000,000 24,000,000
Common stock - shares issued 20,119,194 20,119,194 18,952,385
Treasury stock - shares 608,379 608,379 702,449