Borrowed Funds (Summary of Borrowed Funds) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Short-term borrowings:
Short-term borrowings	$ 190,710	$ 388,923
Long-term debt:
Long-term debt	337,472	362,027
Total	528,182	750,950
Securities Sold Under Repurchase Agreements [Member]
Short-term borrowings:
Short-term borrowings	10,710	8,923
Federal Home Loan Bank Advances [Member]
Short-term borrowings:
Short-term borrowings	180,000	380,000
Federal Home Loan Bank Advances [Member]
Long-term debt:
Long-term debt	$ 337,472	$ 362,027