Revenue from Contract with Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	$ 10,264	$ 8,761	$ 9,001
Employee benefit and retirement-related accounts income	9,705	7,921	7,178
Investment management and investment advisory agency accounts income	12,620	10,652	10,024
Other income from fiduciary activities	1,860	1,539	1,565
Non-sufficient funds (NSF) fees	5,244	4,999	7,073
Demand deposit account (DDA) charges	3,074	2,920	3,105
Other service charges on deposit accounts	514	526	657
Credit card other service income	2,563	2,112	2,361
HELOC other service income	389	424	407
Installment other service income	148	165	173
Real estate other service income	24,907	32,889	11,158
Commercial other service income	1,805	2,021	1,401
Debit card fee income	25,865	22,160	20,250
Bank Owned Life Insurance Income	4,897	4,789	4,557
ATM Fees	2,379	1,773	1,828
Gains (Losses) on Sales of Other Real Estate	(4)	1,207	(222)
Debt and Equity Securities, Gain (Loss)		3,286	(421)
Gain on equity securities, net	5,011	2,182	5,118
Other components of net periodic benefit income	8,152	7,952	4,732
Noninterest Income, Other	10,551	7,386	7,248
Noninterest Income	129,944	125,664	97,193
Bank Servicing [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	29,800	37,600	15,500
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	5,300	5,200	4,900
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Noninterest Income, Other	24,500	32,400	10,600
Pnb Segment [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	10,264	8,761	9,001
Employee benefit and retirement-related accounts income	9,705	7,921	7,178
Investment management and investment advisory agency accounts income	12,620	10,652	10,024
Other income from fiduciary activities	1,860	1,539	1,565
Non-sufficient funds (NSF) fees	5,244	4,999	7,073
Demand deposit account (DDA) charges	3,074	2,920	3,105
Other service charges on deposit accounts	514	526	657
Credit card other service income	2,559	2,108	2,354
HELOC other service income	389	424	403
Installment other service income	148	165	256
Real estate other service income	24,907	32,827	11,167
Commercial other service income	1,280	1,493	1,259
Debit card fee income	25,865	22,160	20,250
Bank Owned Life Insurance Income	4,202	4,521	4,168
ATM Fees	2,379	1,773	1,828
Gains (Losses) on Sales of Other Real Estate	(4)	836	(110)
Debt and Equity Securities, Gain (Loss)		3,286	(421)
Gain on equity securities, net	3,793	2,429	913
Other components of net periodic benefit income	7,946	7,759	4,587
Noninterest Income, Other	10,057	7,132	7,135
Noninterest Income	126,802	124,231	92,392
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	4	4	7
HELOC other service income	0	0	4
Installment other service income	0	0	(83)
Real estate other service income	0	62	(9)
Commercial other service income	525	528	142
Debit card fee income	0	0	0
Bank Owned Life Insurance Income	695	268	389
ATM Fees	0	0	0
Gains (Losses) on Sales of Other Real Estate	0	371	(112)
Debt and Equity Securities, Gain (Loss)		0	0
Gain on equity securities, net	1,218	(247)	4,205
Other components of net periodic benefit income	206	193	145
Noninterest Income, Other	494	254	113
Noninterest Income	$ 3,142	$ 1,433	$ 4,801