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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

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