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Investment Securities Available-for-Sale (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized cost $ 594,386 $ 541,364
Estimated fair value 589,268 538,108
US Agency Securities [Member]    
One year or less, amortized cost 109,893 83,885
One year or less, estimated fair value 108,198 82,548
After one year through five years, amortized cost 74,106 20,736
After one year through five years, estimated fair value 73,916 20,897
Five years through ten years, amortized cost 14,116 2,804
Five years through ten years, estimated fair value 13,870 2,697
Residential Mortgage Backed Securities [Member]    
Amortized cost, without maturity date 322,067 329,606
Estimated fair value, without maturity date 317,836 326,239
Municipal Bonds [Member]    
One year or less, amortized cost 5,068 1,056
One year or less, estimated fair value 5,171 1,070
After one year through five years, amortized cost 19,405 45,808
After one year through five years, estimated fair value 19,879 46,865
Five years through ten years, amortized cost 35,432 46,668
Five years through ten years, estimated fair value 35,846 46,839
After ten years, amortized cost 1,071 1,075
After ten years, estimated fair value 1,161 1,156
Corporate Bonds [Member]    
After one year through five years, amortized cost 11,510 8,008
After one year through five years, estimated fair value 11,673 8,079
After ten years, amortized cost 1,500 1,500
After ten years, estimated fair value 1,500 1,500
Other Equity Investments [Member]    
Amortized cost, without maturity date 218 218
Estimated fair value, without maturity date $ 218 $ 218