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Investment Securities Available-for-Sale (Details 2) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost | $ 774,487 | $ 793,634
Estimated fair value | 772,229 | 784,139
US Agency Securities [Member] |  |
One year or less, amortized cost | 119,133 | 128,148
After one year through five years, amortized cost | 113,513 | 119,856
Five years through ten years, amortized cost | 8,029 | 12,146
One year or less, estimated fair value | 118,203 | 125,545
After one year through five years, estimated fair value | 112,943 | 118,883
Five years through ten years, estimated fair value | 7,873 | 11,917
Residential Mortgage Backed Securities [Member] |  |
Amortized cost, without maturity date | 479,162 | 477,949
Estimated fair value, without maturity date | 477,903 | 472,231
Municipal Bonds [Member] |  |
One year or less, amortized cost | 8,085 | 8,097
After one year through five years, amortized cost | 14,203 | 15,025
Five years through ten years, amortized cost | 21,576 | 21,626
After ten years, amortized cost | 1,065 | 1,066
One year or less, estimated fair value | 8,131 | 8,167
After one year through five years, estimated fair value | 14,372 | 15,081
Five years through ten years, estimated fair value | 21,866 | 21,385
After ten years, estimated fair value | 1,164 | 1,136
Corporate Bonds [Member] |  |
After one year through five years, amortized cost | 8,003 | 8,003
After ten years, amortized cost | 1,500 | 1,500
After one year through five years, estimated fair value | 8,056 | 8,076
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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