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Investment Securities Available-for-Sale (Details 1)
$ in Thousands
Dec. 31, 2017
USD ($)
Number
Dec. 31, 2016
USD ($)
Number
Available-for-sale securities in a continuous loss position, number of securities | Number 183 157
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 272,060 $ 361,079
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 2,593 5,285
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 203,046 23,170
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 4,453 619
Available-for-sale securities in a continuous loss position, estimated fair value 475,106 384,249
Available-for-sale securities in a continuous loss position, unrealized losses $ 7,046 $ 5,904
US Agency Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 38 27
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 102,264 $ 88,991
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1,073 1,764
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 55,093 3,768
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 1,341 38
Available-for-sale securities in a continuous loss position, estimated fair value 157,357 92,759
Available-for-sale securities in a continuous loss position, unrealized losses $ 2,414 $ 1,802
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 137 112
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 152,350 $ 232,347
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1,306 3,110
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 147,953 19,402
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 3,112 581
Available-for-sale securities in a continuous loss position, estimated fair value 300,303 251,749
Available-for-sale securities in a continuous loss position, unrealized losses $ 4,418 $ 3,691
Municipal Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 8 16
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 17,446 $ 34,743
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 214 400
Available-for-sale securities in a continuous loss position, estimated fair value 17,446 34,743
Available-for-sale securities in a continuous loss position, unrealized losses $ 214 $ 400
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   $ 4,998
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses   11
Available-for-sale securities in a continuous loss position, estimated fair value   4,998
Available-for-sale securities in a continuous loss position, unrealized losses   $ 11