Short and Long-term Funding Long-term Funding, Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Line Items]
Long-term Debt	$ 1,870,371
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,621,047	$ 1,632,723
Weighted Average Coupon Rate	2.05%	2.34%
Long Term Funding Maturity within One Year [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 11,811
Long Term Funding Maturity One Year to Two Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	2,363
Long Term Funding Maturity Two Years to Three Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	633
Long Term Funding Maturity Year Three to Year Four [Domain]
Debt Disclosure [Line Items]
Long-term Debt	649,377
Long Term Funding Maturity Year Four to Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	604,813
Long Term Funding Maturity After Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 601,375