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Investment Securities Available-for-Sale (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Amortized cost $ 740,187 $ 793,634
Estimated fair value 745,343 784,139
US Agency Securities [Member]    
One year or less, amortized cost 114,260 128,148
After one year through five years, amortized cost 103,105 119,856
Five years through ten years, amortized cost 8,024 12,146
One year or less, estimated fair value 114,564 125,545
After one year through five years, estimated fair value 103,042 118,883
Five years through ten years, estimated fair value 8,064 11,917
Residential Mortgage Backed Securities [Member]    
Amortized cost, without maturity date 440,243 477,949
Estimated fair value, without maturity date 443,545 472,231
Municipal Bonds [Member]    
One year or less, amortized cost 6,947 8,097
After one year through five years, amortized cost 13,426 15,025
Five years through ten years, amortized cost 46,399 21,626
After ten years, amortized cost 1,063 1,066
One year or less, estimated fair value 6,977 8,167
After one year through five years, estimated fair value 13,694 15,081
Five years through ten years, estimated fair value 47,468 21,385
After ten years, estimated fair value 1,199 1,136
Corporate Bonds [Member]    
Five years through ten years, amortized cost 5,002 8,003
After ten years, amortized cost 1,500 1,500
After one year through five years, estimated fair value 5,072 8,076
After ten years, estimated fair value 1,500 1,500
Investment Securities [Member]    
Amortized cost, without maturity date 218 218
Amortized cost   218
Estimated fair value, without maturity date $ 218 $ 218