Revenue from Contract with Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	$ 10,091	$ 10,264	$ 8,761
Employee benefit and retirement-related accounts income	9,698	9,705	7,921
Investment management and investment advisory agency accounts income	12,442	12,620	10,652
Other income from fiduciary activities	1,860	1,860	1,539
Non-sufficient funds (NSF) fees	6,095	5,244	4,999
Demand deposit account (DDA) charges	3,439	3,074	2,920
Other service charges on deposit accounts	557	514	526
Credit card other service income	2,808	2,563	2,112
HELOC other service income	397	389	424
Installment other service income	163	148	165
Real estate other service income	9,952	24,907	32,889
Commercial other service income	1,975	1,805	2,021
Debit card fee income	26,046	25,865	22,160
Bank Owned Life Insurance Income	6,100	4,897	4,789
ATM Fees	2,273	2,379	1,773
Gains (Losses) on Sales of Other Real Estate	5,611	(4)	1,207
Real Estate Owned, Valuation Allowance, Valuation Increase	12,039	64	105
Debt and Equity Securities, Gain (Loss)			3,286
Gain on equity securities, net	2,955	5,011	2,182
Other components of net periodic benefit income	12,108	8,152	7,952
Noninterest Income, Other	9,326	10,487	7,281
Noninterest Income	135,935	129,944	125,664
Bank Servicing [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	15,300	29,800	37,600
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	5,600	5,300	5,200
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	9,700	24,500	32,400
Pnb Segment [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	10,091	10,264	8,761
Employee benefit and retirement-related accounts income	9,698	9,705	7,921
Investment management and investment advisory agency accounts income	12,442	12,620	10,652
Other income from fiduciary activities	1,860	1,860	1,539
Non-sufficient funds (NSF) fees	6,095	5,244	4,999
Demand deposit account (DDA) charges	3,439	3,074	2,920
Other service charges on deposit accounts	557	514	526
Credit card other service income	2,808	2,559	2,108
HELOC other service income	397	389	424
Installment other service income	163	148	165
Real estate other service income	9,952	24,907	32,827
Commercial other service income	1,214	1,280	1,493
Debit card fee income	26,046	25,865	22,160
Bank Owned Life Insurance Income	4,656	4,202	4,521
ATM Fees	2,273	2,379	1,773
Gains (Losses) on Sales of Other Real Estate	4	(4)	836
Real Estate Owned, Valuation Allowance, Valuation Increase	30	64	105
Debt and Equity Securities, Gain (Loss)			3,286
Gain on equity securities, net	2,068	3,793	2,429
Other components of net periodic benefit income	11,819	7,946	7,759
Noninterest Income, Other	9,599	9,993	7,027
Noninterest Income	115,211	126,802	124,231
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	0	0	0
Employee benefit and retirement-related accounts income	0	0	0
Investment management and investment advisory agency accounts income	0	0	0
Other income from fiduciary activities	0	0	0
Non-sufficient funds (NSF) fees	0	0	0
Demand deposit account (DDA) charges	0	0	0
Other service charges on deposit accounts	0	0	0
Credit card other service income	0	4	4
HELOC other service income	0	0	0
Installment other service income	0	0	0
Real estate other service income	0	0	62
Commercial other service income	761	525	528
Debit card fee income	0	0	0
Bank Owned Life Insurance Income	1,444	695	268
ATM Fees	0	0	0
Gains (Losses) on Sales of Other Real Estate	5,607	0	371
Real Estate Owned, Valuation Allowance, Valuation Increase	12,009	0	0
Debt and Equity Securities, Gain (Loss)			0
Gain on equity securities, net	887	1,218	(247)
Other components of net periodic benefit income	289	206	193
Noninterest Income, Other	(273)	494	254
Noninterest Income	$ 20,724	$ 3,142	$ 1,433