FHLB Borrowings (Details) - Schedule of components of FHLB borrowings and weighted average interest rates - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
By type of borrowing:
FHLB borrowings (in Dollars)	$ 603,412	$ 600,001
Weighted average interest rates	2.60%	2.59%
By remaining period to maturity:
Less than 1 year (in Dollars)	$ 439,159	$ 405,000
Less than 1 year	2.58%	2.57%
1 year through less than 2 years (in Dollars)	$ 81,000	$ 110,000
1 year through less than 2 years	2.85%	2.75%
2 years through less than 3 years (in Dollars)	$ 46,000	$ 60,000
2 years through less than 3 years	2.15%	2.27%
3 years through less than 4 years (in Dollars)	$ 9,804
3 years through less than 4 years	2.48%
4 years through 5 years (in Dollars)	$ 25,000	$ 25,000
4 years through 5 years	2.92%	2.92%
After 5 years (in Dollars)	$ 2,926
After 5 years	2.43%
Total FHLB borrowings (in Dollars)	$ 603,889	$ 600,000
Fair value (discount) premium	(477)	1
FHLB borrowings, net	$ 603,412	$ 600,001