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Investment Securities Available-for-Sale (Details 1)
$ in Thousands
Sep. 30, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Number
Available-for-sale securities in a continuous loss position, number of securities | Number 263 183
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 368,791 $ 272,060
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 6,218 2,593
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 316,786 203,046
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 13,313 4,453
Available-for-sale securities in a continuous loss position, estimated fair value 685,577 475,106
Available-for-sale securities in a continuous loss position, unrealized losses $ 19,531 $ 7,046
US Agency Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 61 38
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 111,702 $ 102,264
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1,909 1,073
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 115,678 55,093
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 4,619 1,341
Available-for-sale securities in a continuous loss position, estimated fair value 227,380 157,357
Available-for-sale securities in a continuous loss position, unrealized losses $ 6,528 $ 2,414
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 184 137
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 237,720 $ 152,350
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 3,938 1,306
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 190,668 147,953
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 8,188 3,112
Available-for-sale securities in a continuous loss position, estimated fair value 428,388 300,303
Available-for-sale securities in a continuous loss position, unrealized losses $ 12,126 $ 4,418
Municipal Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 16 8
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 16,388 $ 17,446
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 352 214
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 10,440  
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 506  
Available-for-sale securities in a continuous loss position, estimated fair value 26,828 17,446
Available-for-sale securities in a continuous loss position, unrealized losses $ 858 $ 214
Corporate Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 2  
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 2,981  
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 19  
Available-for-sale securities in a continuous loss position, estimated fair value 2,981  
Available-for-sale securities in a continuous loss position, unrealized losses $ 19