FHLB Borrowings (Details) - Schedule of components of FHLB borrowings and weighted average interest rates - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
By type of borrowing:
FHLB borrowings (in Dollars)	$ 512,456		$ 600,001
Weighted average interest rates	2.25%	3.29%	2.59%
By remaining period to maturity:
Less than 1 year (in Dollars)	$ 392,169		$ 405,000
Less than 1 year	2.21%		2.57%
1 year through less than 2 years (in Dollars)	$ 57,000		$ 110,000
1 year through less than 2 years	2.27%		2.75%
2 years through less than 3 years (in Dollars)	$ 28,338		$ 60,000
2 years through less than 3 years	2.15%		2.27%
3 years through less than 4 years (in Dollars)	$ 32,421
3 years through less than 4 years	2.82%
4 years through less than 5 years (in Dollars)
4 years through less than 5 years
After 5 years (in Dollars)	$ 2,898		$ 25,000
After 5 years	2.43%		2.92%
Total FHLB borrowings (in Dollars)	$ 512,826		$ 600,000
Fair value (discount) premium	(370)		1
FHLB borrowings, net	$ 512,456		$ 600,001