Derivative Financial Instruments - Effect of Master Netting Arrangements on Derivative Assets and Liabilities in the Consolidated Statements of Condition (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Interest Rate Swaps, Gross Amount of Recognized Assets	$ 1,319	$ 2,352
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition	0	0
Interest Rate Swaps, Net Amount of Assets Presented in the Statement of Condition	1,319	2,352
Interest Rate Swaps, Financial Instruments	0	0
Interest Rate Swaps, Cash Collateral Received	0	0
Interest Rate Swaps, Net Amount	1,319	2,352
Interest Rate Swaps, Gross Amount of Recognized Liabilities	60,987	19,653
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition	0	0
Interest Rate Swaps, Net Amount of Liabilities Presented in the Statement of Condition	60,987	19,653
Interest Rate Swaps, Financial Instruments	99	19,265
Interest Rate Swaps, Cash Collateral Received	63,517	0
Interest Rate Swaps, Net Amount	$ (2,629)	$ 388