Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	$ 2,764	$ 2,626	$ 5,270	$ 5,013
Employee benefit and retirement-related accounts	2,471	2,363	5,031	4,664
Investment management and investment advisory agency accounts	3,143	3,116	6,403	6,125
Other	481	464	952	940
Non-sufficient funds (NSF) fees	1,519	1,144	2,936	2,278
Demand deposit account (DDA) charges	913	774	1,429	1,563
Other	131	114	272	245
Credit card	715	636	1,357	1,216
HELOC	105	99	194	188
Installment	45	46	88	80
Real estate	3,274	6,011	6,993	14,449
Commercial	801	367	1,127	843
Debit card fee income	6,731	6,758	12,857	12,844
Bank owned life insurance income	2,374	1,149	3,549	2,314
ATM Fees	583	655	1,115	1,185
Gain on equity securities, net	709	467	3,062	2,277
Other components of net periodic benefit income	3,027	2,038	6,054	4,076
Other	1,407	2,411	4,160	5,027
Total other income	31,193	31,238	62,849	65,327
Bank Servicing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,940	7,159	9,759	16,776
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,700	1,300	3,000	2,600
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,200	5,900	6,800	14,200
PNB [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	2,764	2,626	5,270	5,013
Employee benefit and retirement-related accounts	2,471	2,363	5,031	4,664
Investment management and investment advisory agency accounts	3,143	3,116	6,403	6,125
Other	481	464	952	940
Non-sufficient funds (NSF) fees	1,519	1,144	2,936	2,278
Demand deposit account (DDA) charges	913	774	1,429	1,563
Other	131	114	272	245
Credit card	715	636	1,357	1,216
HELOC	105	99	194	188
Installment	45	46	88	80
Real estate	3,274	6,011	6,993	14,449
Commercial	301	364	655	782
Debit card fee income	6,731	6,758	12,857	12,844
Bank owned life insurance income	1,130	1,062	2,223	2,147
ATM Fees	583	655	1,115	1,185
Gain on equity securities, net	41	495	2,260	1,329
Other components of net periodic benefit income	2,954	1,986	5,909	3,973
Other	1,954	2,413	4,558	4,905
Total other income	29,255	31,126	60,502	63,926
All Other [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	0	0	0	0
Employee benefit and retirement-related accounts	0	0	0	0
Investment management and investment advisory agency accounts	0	0	0	0
Other	0	0	0	0
Non-sufficient funds (NSF) fees	0	0	0	0
Demand deposit account (DDA) charges	0	0	0	0
Other	0	0	0	0
Credit card	0	0	0	0
HELOC	0	0	0	0
Installment	0	0	0	0
Real estate	0	0	0	0
Commercial	500	3	472	61
Debit card fee income	0	0	0	0
Bank owned life insurance income	1,244	87	1,326	167
ATM Fees	0	0	0	0
Gain on equity securities, net	668	(28)	802	948
Other components of net periodic benefit income	73	52	145	103
Other	(547)	(2)	(398)	122
Total other income	$ 1,938	$ 112	$ 2,347	$ 1,401