Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total		Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings		Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Unallocated ESOP Shares	Unallocated ESOP Shares Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2018		$ 269,584				$ 19,035		$ 314,533		$ 29,257				$ (100)		$ (13,810)		$ (79,331)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		37,475								37,475
Other Comprehensive Income		7,453														7,453
Stock Dividend		0	[1]			571		17,737		(18,308)	[1]
Cash Dividends Paid		(15,206)								(15,206)
Shares Issued for Stock Option Exercises, net		1,792						877										915
Shares Issued Under the Directors' Stock Plan		258						177										81
Shares Issued Under the Employee Stock Purchase Plan		493						328										165
Shares Issued for Dividend Reinvestment Plans		1,777						1,232										545
Stock-Based Compensation Expense		391						391
Purchases of Treasury Stock		(2,469)																(2,469)
Allocation of ESOP Stock		180						80						100
Ending balance at Dec. 31, 2019		301,728				19,606		335,355		33,218				0		(6,357)		(80,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		40,827								40,827
Other Comprehensive Income		5,541														5,541
Stock Dividend	[2]	0				588		15,818		(16,406)
Cash Dividends Paid	[1]	(15,740)								(15,740)
Shares Issued for Stock Option Exercises, net		748						433										315
Shares Issued Under the Directors' Stock Plan		125						83										42
Shares Issued Under the Employee Stock Purchase Plan		513						339										174
Shares Issued for Dividend Reinvestment Plans		1,808						1,214										594
Stock-Based Compensation Expense		420						420
Purchases of Treasury Stock		(1,578)																(1,578)
Ending balance at Dec. 31, 2020		$ 334,392		$ 120	$ 334,512	20,194	$ 20,194	353,662	$ 353,662	41,899		$ 120	$ 42,019	0	$ 0	(816)	$ (816)	(80,547)	$ (80,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-13
Net Income		$ 49,857								49,857
Other Comprehensive Income		1,163														1,163
Stock Dividend	[2]	0				606		20,896		(21,502)
Cash Dividends Paid	[1]	(16,296)								(16,296)
Shares Issued for Stock Option Exercises, net		1,505						1,016										489
Shares Issued Under the Directors' Stock Plan		376						278										98
Shares Issued Under the Employee Stock Purchase Plan		481						350										131
Shares Issued for Dividend Reinvestment Plans		1,836						1,380										456
Stock-Based Compensation Expense		414						414
Purchases of Treasury Stock		(2,662)																(2,662)
Ending balance at Dec. 31, 2021		$ 371,186				$ 20,800		$ 377,996		$ 54,078				$ 0		$ 347		$ (82,035)

[1] Cash dividends paid per share have been adjusted for the September 24, 2021 3% stock dividend.

[2] Included in the shares issued for the 3% stock dividend in 2021 were treasury shares of 139,237