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Investment Securities Available-for-Sale (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized cost $ 671,628 $ 594,386
Estimated fair value 656,942 589,268
US Agency Securities [Member]    
One year or less, amortized cost 111,981 109,893
One year or less, estimated fair value 108,302 108,198
After one year through five years, amortized cost 91,692 74,106
After one year through five years, estimated fair value 90,544 73,916
Five years through ten years, amortized cost 21,937 14,116
Five years through ten years, estimated fair value 21,305 13,870
Residential Mortgage Backed Securities [Member]    
Amortized cost, without maturity date 389,504 322,067
Estimated fair value, without maturity date 380,306 317,836
Municipal Bonds [Member]    
One year or less, amortized cost 6,118 5,068
One year or less, estimated fair value 6,197 5,171
After one year through five years, amortized cost 16,880 19,405
After one year through five years, estimated fair value 17,056 19,879
Five years through ten years, amortized cost 24,226 35,432
Five years through ten years, estimated fair value 23,797 35,846
After ten years, amortized cost 1,068 1,071
After ten years, estimated fair value 1,154 1,161
Corporate Bonds [Member]    
After one year through five years, amortized cost 6,504 11,510
After one year through five years, estimated fair value 6,563 11,673
After ten years, amortized cost 1,500 1,500
After ten years, estimated fair value 1,500 1,500
Investment Securities [Member]    
Amortized cost, without maturity date 218 218
Estimated fair value, without maturity date $ 218 $ 218