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Investment Securities Available-for-Sale (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortized cost $ 793,634 $ 594,386
Estimated fair value 784,139 589,268
US Agency Securities [Member]    
One year or less, amortized cost 128,148 109,893
After one year through five years, amortized cost 119,856 74,106
Five years through ten years, amortized cost 12,146 14,116
One year or less, estimated fair value 125,545 108,198
After one year through five years, estimated fair value 118,883 73,916
Five years through ten years, estimated fair value 11,917 13,870
Residential Mortgage Backed Securities [Member]    
Amortized cost, without maturity date 477,949 322,067
Estimated fair value, without maturity date 472,231 317,836
Municipal Bonds [Member]    
One year or less, amortized cost 8,097 5,068
After one year through five years, amortized cost 15,025 19,405
Five years through ten years, amortized cost 21,626 35,432
After ten years, amortized cost 1,066 1,071
One year or less, estimated fair value 8,167 5,171
After one year through five years, estimated fair value 15,081 19,879
Five years through ten years, estimated fair value 21,385 35,846
After ten years, estimated fair value 1,136 1,161
Corporate Bonds [Member]    
After one year through five years, amortized cost 8,003 11,510
After ten years, amortized cost 1,500 1,500
After one year through five years, estimated fair value 8,076 11,673
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