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Investment Securities Available-for-Sale (Details 1)
$ in Thousands
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Available-for-sale securities in a continuous loss position, number of securities 144 221
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 31,883 $ 139,671
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 63 1,116
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 273,568 387,672
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 2,480 10,700
Available-for-sale securities in a continuous loss position, estimated fair value 305,451 527,343
Available-for-sale securities in a continuous loss position, unrealized losses $ 2,543 $ 11,816
US Agency Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 39 58
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 26,149 $ 72,679
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 50 533
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 99,252 144,636
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 609 3,500
Available-for-sale securities in a continuous loss position, estimated fair value 125,401 217,315
Available-for-sale securities in a continuous loss position, unrealized losses $ 659 $ 4,033
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 103 151
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 4,234 $ 61,199
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 13 527
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 174,316 225,995
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 1,871 6,766
Available-for-sale securities in a continuous loss position, estimated fair value 178,550 287,194
Available-for-sale securities in a continuous loss position, unrealized losses $ 1,884 $ 7,293
Municipal Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities 2,000 11
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 1,500 $ 4,299
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses   50
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
Available-for-sale securities in a continuous loss position, unrealized losses   $ 484
Corporate Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities   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 $ 1,500 1,494
Available-for-sale securities in a continuous loss position, unrealized losses   $ 6