FHLB Borrowings (Details) - Schedule of components of FHLB borrowings and weighted average interest rates - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
By type of borrowing:
FHLB borrowings (in Dollars)	$ 585,124	$ 461,280
Weighted average interest rates	1.61%	1.55%
By remaining period to maturity:
Less than 1 year (in Dollars)	$ 415,124	$ 231,280
Less than 1 year	1.41%	1.02%
1 year through less than 2 years (in Dollars)	$ 105,000	$ 130,000
1 year through less than 2 years	1.69%	1.84%
2 years through less than 3 years (in Dollars)	$ 25,000	$ 35,000
2 years through less than 3 years	1.85%	1.60%
3 years through less than 4 years (in Dollars)	$ 40,000	$ 65,000
3 years through less than 4 years	3.43%	2.82%
4 years through 5 years (in Dollars)
4 years through 5 years