Securities - Securities Sold (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Carrying Value	$ 511,419,000		$ 511,419,000
Net Proceeds	488,981,000	$ 0	488,981,000	$ 0
(Loss)	(22,438,000)		(22,438,000)
Obligations of other U.S. Government agencies and corporations
Debt Securities, Available-for-sale [Line Items]
Carrying Value	170,000,000		170,000,000
Net Proceeds	164,915,000		164,915,000
(Loss)	(5,085,000)		(5,085,000)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Carrying Value	104,950,000		104,950,000
Net Proceeds	99,439,000		99,439,000
(Loss)	(5,511,000)		(5,511,000)
Residential mortgage backed securities: | Government agency mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Carrying Value	137,196,000		137,196,000
Net Proceeds	130,602,000		130,602,000
(Loss)	(6,594,000)		(6,594,000)
Residential mortgage backed securities: | Government agency collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Carrying Value	54,028,000		54,028,000
Net Proceeds	51,101,000		51,101,000
(Loss)	(2,927,000)		(2,927,000)
Commercial mortgage backed securities: | Government agency mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Carrying Value	5,048,000		5,048,000
Net Proceeds	4,825,000		4,825,000
(Loss)	(223,000)		(223,000)
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Carrying Value	40,197,000		40,197,000
Net Proceeds	38,099,000		38,099,000
(Loss)	$ (2,098,000)		$ (2,098,000)