Loans and Leases, Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 66,885	$ 61,007
Provision / (recapture) for credit losses	1,500	0
Charge-offs	(24)	(9)
Recoveries	212	34
Net (charge-offs) / recoveries	188	25
Balance at end of period	68,573	61,032
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		0
Commercial & Agricultural R/E [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	32,551	38,149
Provision / (recapture) for credit losses	(27)	552
Charge-offs	0	0
Recoveries	170	0
Net (charge-offs) / recoveries	170	0
Balance at end of period	32,694	32,511
Commercial & Agricultural R/E [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		(6,190)
Construction [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,026	1,456
Provision / (recapture) for credit losses	(241)	466
Charge-offs	0	0
Recoveries	0	0
Net (charge-offs) / recoveries	0	0
Balance at end of period	2,785	3,777
Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		1,855
Residential & Home Equity [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	7,508	2,847
Provision / (recapture) for credit losses	(170)	866
Charge-offs	(14)	0
Recoveries	10	14
Net (charge-offs) / recoveries	(4)	14
Balance at end of period	7,334	6,759
Residential & Home Equity [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		3,032
Commercial & Agricultural [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	21,705	16,954
Provision / (recapture) for credit losses	2,163	(1,700)
Charge-offs	0	0
Recoveries	20	18
Net (charge-offs) / recoveries	20	18
Balance at end of period	23,888	16,098
Commercial & Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		826
Commercial Leases [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,924	938
Provision / (recapture) for credit losses	(204)	(101)
Charge-offs	0	0
Recoveries	0	0
Net (charge-offs) / recoveries	0	0
Balance at end of period	1,720	1,466
Commercial Leases [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		629
Consumer and Other [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	171	663
Provision / (recapture) for credit losses	(21)	(83)
Charge-offs	(10)	(9)
Recoveries	12	2
Net (charge-offs) / recoveries	2	(7)
Balance at end of period	$ 152	421
Consumer and Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		$ (152)