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Investment Securities Available-for-Sale (Details 1)
$ in Thousands
Dec. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Number
Available-for-sale securities in a continuous loss position, number of securities | Number 221 183
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 139,671 $ 272,060
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1,116 2,593
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 387,672 203,046
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 10,700 4,453
Available-for-sale securities in a continuous loss position, estimated fair value 527,343 475,106
Available-for-sale securities in a continuous loss position, unrealized losses $ 11,816 $ 7,046
US Agency Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 58 38
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 72,679 $ 102,264
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 533 1,073
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 144,636 55,093
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 3,500 1,341
Available-for-sale securities in a continuous loss position, estimated fair value 217,315 157,357
Available-for-sale securities in a continuous loss position, unrealized losses $ 4,033 $ 2,414
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 151 137
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 61,199 $ 152,350
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 527 1,306
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 225,995 147,953
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 6,766 3,112
Available-for-sale securities in a continuous loss position, estimated fair value 287,194 300,303
Available-for-sale securities in a continuous loss position, unrealized losses $ 7,293 $ 4,418
Municipal Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 11 8
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 4,299 $ 17,446
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 50 214
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 17,041  
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 434  
Available-for-sale securities in a continuous loss position, estimated fair value 21,340 17,446
Available-for-sale securities in a continuous loss position, unrealized losses $ 484 $ 214
Corporate Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 1  
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 1,494  
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 6  
Available-for-sale securities in a continuous loss position, estimated fair value 1,494  
Available-for-sale securities in a continuous loss position, unrealized losses $ 6