Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	$ 2,504	$ 2,506
Employee benefit and retirement-related accounts	2,472	2,560
Investment management and investment advisory agency accounts	3,162	3,260
Other	477	471
Non-sufficient funds (NSF) fees	1,061	1,417
Demand deposit account (DDA) charges	1,038	516
Other	142	141
Credit card	683	642
HELOC	89	89
Installment	49	43
Real estate	1,455	3,719
Commercial	421	326
Debit card fee income	6,457	6,126
Bank owned life insurance income	1,185	1,175
ATM Fees	533	532
Gains (Losses) on Sales of Other Real Estate	(9)	0
Real Estate Owned, Valuation Allowance, Valuation Increase	15	30
Loss (gain) on equity securities, net	(405)	2,353
Other components of net periodic benefit income	1,893	3,027
Other	1,165	2,723
Total other income	24,387	31,656
Bank Servicing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,697	4,819
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,400	1,200
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,300	3,600
PNB [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	2,504	2,506
Employee benefit and retirement-related accounts	2,472	2,560
Investment management and investment advisory agency accounts	3,162	3,260
Other	477	471
Non-sufficient funds (NSF) fees	1,061	1,417
Demand deposit account (DDA) charges	1,038	516
Other	142	141
Credit card	683	642
HELOC	89	89
Installment	49	43
Real estate	1,455	3,719
Commercial	286	354
Debit card fee income	6,457	6,126
Bank owned life insurance income	1,134	1,093
ATM Fees	533	532
Gains (Losses) on Sales of Other Real Estate	(9)	0
Real Estate Owned, Valuation Allowance, Valuation Increase	15	30
Loss (gain) on equity securities, net	(307)	2,219
Other components of net periodic benefit income	1,857	2,955
Other	1,164	2,574
Total other income	24,262	31,247
All Other [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	0	0
Employee benefit and retirement-related accounts	0	0
Investment management and investment advisory agency accounts	0	0
Other	0	0
Non-sufficient funds (NSF) fees	0	0
Demand deposit account (DDA) charges	0	0
Other	0	0
Credit card	0	0
HELOC	0	0
Installment	0	0
Real estate	0	0
Commercial	135	(28)
Debit card fee income	0	0
Bank owned life insurance income	51	82
ATM Fees	0	0
Gains (Losses) on Sales of Other Real Estate	0	0
Real Estate Owned, Valuation Allowance, Valuation Increase	0	0
Loss (gain) on equity securities, net	(98)	134
Other components of net periodic benefit income	36	72
Other	1	149
Total other income	$ 125	$ 409