FHLB Borrowings (Details) - Schedule of components of FHLB and other borrowings and weighted average interest rates - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
By type of borrowing:
FHLB borrowings and other borrowings (in Dollars)	$ 670,077	$ 476,280
Weighted average interest rates	1.76%	1.55%
By remaining period to maturity:
Less than 1 year (in Dollars)	$ 505,077	$ 231,280
Less than 1 year	1.59%	1.02%
1 year through less than 2 years (in Dollars)	$ 35,000	$ 130,000
1 year through less than 2 years	1.60%	1.84%
2 years through less than 3 years (in Dollars)	$ 85,000	$ 35,000
2 years through less than 3 years	2.65%	1.60%
3 years through less than 4 years (in Dollars)	$ 45,000	$ 65,000
3 years through less than 4 years	2.15%	2.82%
4 years through 5 years (in Dollars)
4 years through 5 years
Federal Home Loan Bank Advances [Member]
By type of borrowing:
FHLB borrowings and other borrowings (in Dollars)	$ 670,077	$ 461,280
Weighted average interest rates	1.76%	1.55%