Loans (Narrative) (Details) $ in Thousands		Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Carrying value of Payment Protection Program loans		$ 38,000	$ 199,800
Net unamortized loan origination costs		6,700	1,500
Net unamortized premiums on purchased loans		414	787
Accrued interest receivable		10,300	11,300
Loans pledged as collateral		$ 2,200,000	2,100,000
Number of executed loan modifications due to COVID-19 | loan		654
Balance of executed loan modifications due to COVID-19		$ 727,700
Number of active deferments due to COVID-19 | loan		2
Balance of active deferments due to COVID-19		$ 9,700
Nonaccrual loans		9,400	8,500
Nonaccrual loans current on payment		4,800	4,700
Nonaccrual loans, no ACL deemed necessary		4,200	3,000
Residential loans in process of foreclosure		1,500	3,400
Individually analyzed loans		21,100
Total loans	[1]	4,272,925	4,195,990
Total loans	[1]	4,272,925	4,195,990
Nonaccrual loans, no ACL deemed necessary		4,200	3,000
Carrying value of Payment Protection Program loans		38,000	199,800
Loans pledged as collateral		2,200,000	2,100,000
Collateral Dependent Individually Analyzed [Member]
Receivables [Abstract]
Total loans		14,406	8,444
Total loans		$ 14,406	$ 8,444

[1] Includes net unamortized loan origination costs of $6.7 million and $1.5 million, respectively, at December 31, 2021 and 2020 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $414 thousand and $787 thousand, respectively, at December 31, 2021 and 2020.