Short Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Other Short-term Borrowings	$ 317,230	$ 175,657
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months	25,000	55,000
Short-term Debt, Total	342,230	230,657
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	14,000	18,000
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term Debt, Total	317,230	175,657
Short-term Debt, Maximum Month-end Outstanding Amount	317,230	207,079
Short-term Debt, Average Outstanding Amount	$ 250,266	$ 168,449
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.03%	0.73%
Short-term Debt, Weighted Average Interest Rate, over Time	0.19%	0.66%
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term Debt, Total	$ 25,000	$ 55,000
Short-term Debt, Maximum Month-end Outstanding Amount	25,000	205,000
Short-term Debt, Average Outstanding Amount	$ 26,751	$ 47,371
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.26%	1.73%
Short-term Debt, Weighted Average Interest Rate, over Time	2.38%	2.89%
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$ 1,521,000	$ 1,566,000