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Investment Securities Available-for-Sale (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and estimated fair value of securities available-for-sale

Amortized cost and estimated fair value of securities available-for-sale are summarized as follows:

 

          Gross     Gross     Estimated  
December 31, 2018   Amortized     Unrealized     Unrealized     Fair  
(dollars in thousands)   Cost     Gains     Losses     Value  
U. S. agency securities   $ 260,150     $ 228     $ 4,033     $ 256,345  
Residential mortgage backed securities     477,949       1,575       7,293       472,231  
Municipal bonds     45,814       439       484       45,769  
Corporate bonds     9,503       79       6       9,576  
Other equity investments     218       —       —       218  
    $ 793,634     $ 2,321     $ 11,816     $ 784,139  

 

December 31, 2017      Amortized         Unrealized         Unrealized         Fair   
(dollars in thousands)      Cost         Gains         Losses         Value   
U. S. agency securities   $ 198,115     $ 283     $ 2,414     $ 195,984  
Residential mortgage backed securities     322,067       187       4,418       317,836  
Municipal bonds     60,976       1,295       214       62,057  
Corporate bonds     13,010       163       —       13,173  
Other equity investments     218       —       —       218  
    $ 594,386     $ 1,928     $ 7,046     $ 589,268  
Schedule of gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position

Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position as of December 31, 2018 and 2017 are as follows:

 

          Less than     12 Months        
          12 Months     or Greater     Total  
          Estimated           Estimated           Estimated        
December 31, 2018   Number of     Fair     Unrealized     Fair     Unrealized     Fair     Unrealized  
(dollars in thousands)   Securities     Value     Losses     Value     Losses     Value     Losses  
U. S. agency securities     58     $ 72,679     $ 533     $ 144,636     $ 3,500     $ 217,315     $ 4,033  
Residential mortgage backed securities     151       61,199       527       225,995       6,766       287,194       7,293  
Municipal bonds     11       4,299       50       17,041       434       21,340       484  
Corporate bonds     1       1,494       6       —       —       1,494       6  
      221     $ 139,671     $ 1,116     $ 387,672     $ 10,700     $ 527,343     $ 11,816  

 

          Less than     12 Months        
          12 Months     or Greater     Total  
          Estimated           Estimated           Estimated        
December 31, 2017   Number of     Fair     Unrealized     Fair     Unrealized     Fair     Unrealized  
(dollars in thousands)   Securities     Value     Losses     Value     Losses     Value     Losses  
U. S. agency securities     38     $ 102,264     $ 1,073     $ 55,093     $ 1,341     $ 157,357     $ 2,414  
Residential mortgage backed securities     137       152,350       1,306       147,953       3,112       300,303       4,418  
Municipal bonds     8       17,446       214       —       —       17,446       214  
      183     $ 272,060     $ 2,593     $ 203,046     $ 4,453     $ 475,106     $ 7,046  
Schedule of amortized cost and estimated fair value of investments available-for-sale by contractual maturity

The amortized cost and estimated fair value of investments available-for-sale at December 31, 2018 and 2017 by contractual maturity are shown in the table below.

    December 31, 2018     December 31, 2017  
    Amortized     Estimated     Amortized     Estimated  
(dollars in thousands)   Cost     Fair Value     Cost     Fair Value  
U. S. agency securities maturing:                                
   One year or less   $ 128,148     $ 125,545     $ 109,893     $ 108,198  
   After one year through five years     119,856       118,883       74,106       73,916  
   Five years through ten years     12,146       11,917       14,116       13,870  
Residential mortgage backed securities     477,949       472,231       322,067       317,836  
Municipal bonds maturing:                                
   One year or less     8,097       8,167       5,068       5,171  
   After one year through five years     15,025       15,081       19,405       19,879  
   Five years through ten years     21,626       21,385       35,432       35,846  
   After ten years     1,066       1,136       1,071       1,161  
Corporate bonds maturing:                                
   After one year through five years     8,003       8,076       11,510       11,673  
   After ten years     1,500       1,500       1,500       1,500  
Other equity investments     218       218       218       218  
    $ 793,634     $ 784,139     $ 594,386     $ 589,268