Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 20, 2021	Dec. 31, 2019
Stockholders' Equity [Abstract]
Unrecognized prior service cost and net actuarial (losses) on pension plans	$ (16,269)	$ (20,134)		$ (21,677)
Unrealized (losses) gains on derivatives (cash flow hedges)	0	(16)		(32)
Unrealized net holding gains (losses) on AFS securities	(7,075)	20,567		2,683
AOCI	$ (23,344)	$ 417		$ (19,026)
Preceding period of retained net profits for approval of Office of Comptroller of the Currency	2 years
Statutory amount available for dividend payments	$ 164,600
Stock Repurchase Program [Abstract]
Purchase of common stock (in shares)	604,637	263,507
Purchase of common stock value	$ 21,714	$ 7,980
Average price per share (in dollars per share)	$ 35.91
Number of shares authorized under stock repurchase program (in shares)			2,000,000
Number of shares available for repurchase under stock repurchase program (in shares)	2,000,000